// stringlint:disable

#import "MIMETypeUtil.h"
#import "OWSFileSystem.h"

#if TARGET_OS_IPHONE
#import <MobileCoreServices/MobileCoreServices.h>

#else
#import <CoreServices/CoreServices.h>

#endif

NS_ASSUME_NONNULL_BEGIN

NSString *const OWSMimeTypeApplicationOctetStream = @"application/octet-stream";
NSString *const OWSMimeTypeImagePng = @"image/png";
NSString *const OWSMimeTypeImageJpeg = @"image/jpeg";
NSString *const OWSMimeTypeImageGif = @"image/gif";
NSString *const OWSMimeTypeImageTiff1 = @"image/tiff";
NSString *const OWSMimeTypeImageTiff2 = @"image/x-tiff";
NSString *const OWSMimeTypeImageBmp1 = @"image/bmp";
NSString *const OWSMimeTypeImageBmp2 = @"image/x-windows-bmp";
NSString *const OWSMimeTypeImageWebp = @"image/webp";
NSString *const OWSMimeTypeImageHeic = @"image/heic";
NSString *const OWSMimeTypeImageHeif = @"image/heif";
NSString *const OWSMimeTypeUnknownForTests = @"unknown/mimetype";
NSString *const OWSMimeTypeApplicationZip = @"application/zip";
NSString *const OWSMimeTypeApplicationPdf = @"application/pdf";

NSString *const kTextAttachmentFileExtension = @"txt";
NSString *const kUnknownTestAttachmentUTI = @"org.whispersystems.unknown";
NSString *const kSyncMessageFileExtension = @"bin";

@implementation MIMETypeUtil

+ (NSDictionary *)supportedVideoMIMETypesToExtensionTypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"video/3gpp" : @"3gp",
            @"video/3gpp2" : @"3g2",
            @"video/mp4" : @"mp4",
            @"video/quicktime" : @"mov",
            @"video/x-m4v" : @"m4v",
            @"video/mpeg" : @"mpg",
        };
    });
    return result;
}

+ (NSDictionary *)supportedAudioMIMETypesToExtensionTypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"audio/aac" : @"m4a",
            @"audio/x-m4p" : @"m4p",
            @"audio/x-m4b" : @"m4b",
            @"audio/x-m4a" : @"m4a",
            @"audio/wav" : @"wav",
            @"audio/x-wav" : @"wav",
            @"audio/x-mpeg" : @"mp3",
            @"audio/mpeg" : @"mp3",
            @"audio/mp4" : @"mp4",
            @"audio/mp3" : @"mp3",
            @"audio/mpeg3" : @"mp3",
            @"audio/x-mp3" : @"mp3",
            @"audio/x-mpeg3" : @"mp3",
            @"audio/aiff" : @"aiff",
            @"audio/x-aiff" : @"aiff",
            @"audio/3gpp2" : @"3g2",
            @"audio/3gpp" : @"3gp",
        };
    });
    return result;
}

+ (NSDictionary *)supportedImageMIMETypesToExtensionTypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            OWSMimeTypeImageJpeg : @"jpeg",
            @"image/pjpeg" : @"jpeg",
            OWSMimeTypeImagePng : @"png",
            @"image/tiff" : @"tif",
            @"image/x-tiff" : @"tif",
            @"image/bmp" : @"bmp",
            @"image/x-windows-bmp" : @"bmp",
            @"image/gif" : @"gif",
            @"image/x-icon": @"ico",
            OWSMimeTypeImageWebp : @"webp"
        };
    });
    return result;
}

+ (NSDictionary *)supportedAnimatedMIMETypesToExtensionTypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            OWSMimeTypeImageGif : @"gif",
            OWSMimeTypeImageWebp : @"image/webp",
        };
    });
    return result;
}

+ (NSDictionary *)supportedBinaryDataMIMETypesToExtensionTypes
{
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            OWSMimeTypeApplicationOctetStream : @"dat",
        };
    });
    return result;
}

+ (NSDictionary *)supportedVideoExtensionTypesToMIMETypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"3gp" : @"video/3gpp",
            @"3gpp" : @"video/3gpp",
            @"3gp2" : @"video/3gpp2",
            @"3gpp2" : @"video/3gpp2",
            @"mp4" : @"video/mp4",
            @"mov" : @"video/quicktime",
            @"mqv" : @"video/quicktime",
            @"m4v" : @"video/x-m4v",
            @"mpg" : @"video/mpeg",
            @"mpeg" : @"video/mpeg",
        };
    });
    return result;
}

+ (NSDictionary *)supportedAudioExtensionTypesToMIMETypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"3gp" : @"audio/3gpp",
            @"3gpp" : @"@audio/3gpp",
            @"3g2" : @"audio/3gpp2",
            @"3gp2" : @"audio/3gpp2",
            @"aiff" : @"audio/aiff",
            @"aif" : @"audio/aiff",
            @"aifc" : @"audio/aiff",
            @"cdda" : @"audio/aiff",
            @"mp3" : @"audio/mp3",
            @"swa" : @"audio/mp3",
            @"mp4" : @"audio/mp4",
            @"wav" : @"audio/wav",
            @"bwf" : @"audio/wav",
            @"m4a" : @"audio/x-m4a",
            @"m4b" : @"audio/x-m4b",
            @"m4p" : @"audio/x-m4p"
        };
    });
    return result;
}

+ (NSDictionary *)supportedImageExtensionTypesToMIMETypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"png" : OWSMimeTypeImagePng,
            @"x-png" : OWSMimeTypeImagePng,
            @"jfif" : @"image/jpeg",
            @"jfif" : @"image/pjpeg",
            @"jfif-tbnl" : @"image/jpeg",
            @"jpe" : @"image/jpeg",
            @"jpe" : @"image/pjpeg",
            @"jpeg" : @"image/jpeg",
            @"jpg" : @"image/jpeg",
            @"tif" : @"image/tiff",
            @"tiff" : @"image/tiff",
            @"webp" : OWSMimeTypeImageWebp
        };
    });
    return result;
}

+ (NSDictionary *)supportedAnimatedExtensionTypesToMIMETypes {
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"gif" : OWSMimeTypeImageGif,
            @"image/webp" : OWSMimeTypeImageWebp
        };
    });
    return result;
}

+ (BOOL)isSupportedVideoMIMEType:(NSString *)contentType {
    return [[self supportedVideoMIMETypesToExtensionTypes] objectForKey:contentType] != nil;
}

+ (BOOL)isSupportedAudioMIMEType:(NSString *)contentType {
    return [[self supportedAudioMIMETypesToExtensionTypes] objectForKey:contentType] != nil;
}

+ (BOOL)isSupportedImageMIMEType:(NSString *)contentType {
    return [[self supportedImageMIMETypesToExtensionTypes] objectForKey:contentType] != nil;
}

+ (BOOL)isSupportedAnimatedMIMEType:(NSString *)contentType {
    return [[self supportedAnimatedMIMETypesToExtensionTypes] objectForKey:contentType] != nil;
}

+ (BOOL)isSupportedBinaryDataMIMEType:(NSString *)contentType
{
    return [[self supportedBinaryDataMIMETypesToExtensionTypes] objectForKey:contentType] != nil;
}

+ (BOOL)isSupportedVideoFile:(NSString *)filePath {
    return [[self supportedVideoExtensionTypesToMIMETypes] objectForKey:filePath.pathExtension.lowercaseString] != nil;
}

+ (BOOL)isSupportedAudioFile:(NSString *)filePath {
    return [[self supportedAudioExtensionTypesToMIMETypes] objectForKey:filePath.pathExtension.lowercaseString] != nil;
}

+ (BOOL)isSupportedImageFile:(NSString *)filePath {
    return [[self supportedImageExtensionTypesToMIMETypes] objectForKey:filePath.pathExtension.lowercaseString] != nil;
}

+ (BOOL)isSupportedAnimatedFile:(NSString *)filePath {
    return
        [[self supportedAnimatedExtensionTypesToMIMETypes] objectForKey:filePath.pathExtension.lowercaseString] != nil;
}

+ (nullable NSString *)getSupportedExtensionFromVideoMIMEType:(NSString *)supportedMIMEType
{
    return [[self supportedVideoMIMETypesToExtensionTypes] objectForKey:supportedMIMEType];
}

+ (nullable NSString *)getSupportedExtensionFromAudioMIMEType:(NSString *)supportedMIMEType
{
    return [[self supportedAudioMIMETypesToExtensionTypes] objectForKey:supportedMIMEType];
}

+ (nullable NSString *)getSupportedExtensionFromImageMIMEType:(NSString *)supportedMIMEType
{
    return [[self supportedImageMIMETypesToExtensionTypes] objectForKey:supportedMIMEType];
}

+ (nullable NSString *)getSupportedExtensionFromAnimatedMIMEType:(NSString *)supportedMIMEType
{
    return [[self supportedAnimatedMIMETypesToExtensionTypes] objectForKey:supportedMIMEType];
}

+ (nullable NSString *)getSupportedExtensionFromBinaryDataMIMEType:(NSString *)supportedMIMEType
{
    return [[self supportedBinaryDataMIMETypesToExtensionTypes] objectForKey:supportedMIMEType];
}

#pragma mark full attachment utilities
+ (BOOL)isAnimated:(NSString *)contentType {
    return [MIMETypeUtil isSupportedAnimatedMIMEType:contentType];
}

+ (BOOL)isBinaryData:(NSString *)contentType
{
    return [MIMETypeUtil isSupportedBinaryDataMIMEType:contentType];
}

+ (BOOL)isImage:(NSString *)contentType {
    return [MIMETypeUtil isSupportedImageMIMEType:contentType];
}

+ (BOOL)isVideo:(NSString *)contentType {
    return [MIMETypeUtil isSupportedVideoMIMEType:contentType];
}

+ (BOOL)isAudio:(NSString *)contentType {
    return [MIMETypeUtil isSupportedAudioMIMEType:contentType];
}

+ (BOOL)isText:(NSString *)contentType {
    return [
        @[
            @"text/plain",
            @"text/csv",
            @"text/tab-separated-values"
        ]
        containsObject:contentType
    ];
}

+ (BOOL)isMicrosoftDoc:(NSString *)contentType {
    return [
        @[
            // Word files
            @"application/msword",

            @"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            @"application/vnd.openxmlformats-officedocument.wordprocessingml.template",
            @"application/vnd.ms-word.document.macroEnabled.12",
            @"application/vnd.ms-word.template.macroEnabled.12",

            // Excel files
            @"application/vnd.ms-excel",

            @"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            @"application/vnd.openxmlformats-officedocument.spreadsheetml.template",
            @"application/vnd.ms-excel.sheet.macroEnabled.12",
            @"application/vnd.ms-excel.template.macroEnabled.12",
            @"application/vnd.ms-excel.addin.macroEnabled.12",
            @"application/vnd.ms-excel.sheet.binary.macroEnabled.12",

            // Powerpoint files
            @"application/vnd.ms-powerpoint",

            @"application/vnd.openxmlformats-officedocument.presentationml.presentation",
            @"application/vnd.openxmlformats-officedocument.presentationml.template",
            @"application/vnd.openxmlformats-officedocument.presentationml.slideshow",
            @"application/vnd.ms-powerpoint.addin.macroEnabled.12",
            @"application/vnd.ms-powerpoint.presentation.macroEnabled.12",
            @"application/vnd.ms-powerpoint.template.macroEnabled.12",
            @"application/vnd.ms-powerpoint.slideshow.macroEnabled.12"
        ]
        containsObject:contentType
    ];
}

+ (BOOL)isVisualMedia:(NSString *)contentType
{
    if ([self isImage:contentType]) {
        return YES;
    }

    if ([self isVideo:contentType]) {
        return YES;
    }

    if ([self isAnimated:contentType]) {
        return YES;
    }

    return NO;
}

+ (nullable NSString *)filePathForAttachment:(NSString *)uniqueId
                                  ofMIMEType:(NSString *)contentType
                              sourceFilename:(nullable NSString *)sourceFilename
                                    inFolder:(NSString *)folder
{
    NSString *kDefaultFileExtension = @"bin";

    if (sourceFilename.length > 0) {
        NSString *normalizedFilename =
            [sourceFilename stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
        // Ensure that the filename is a valid filesystem name,
        // replacing invalid characters with an underscore.
        for (NSCharacterSet *invalidCharacterSet in @[
                 [NSCharacterSet whitespaceAndNewlineCharacterSet],
                 [NSCharacterSet illegalCharacterSet],
                 [NSCharacterSet controlCharacterSet],
                 [NSCharacterSet characterSetWithCharactersInString:@"<>|\\:()&;?*/~"],
             ]) {
            normalizedFilename = [[normalizedFilename componentsSeparatedByCharactersInSet:invalidCharacterSet]
                componentsJoinedByString:@"_"];
        }
        
        // Remove leading periods to prevent hidden files,
        // "." and ".." special file names.
        while ([normalizedFilename hasPrefix:@"."]) {
            normalizedFilename = [normalizedFilename substringFromIndex:1];
        }

        NSString *fileExtension = [[normalizedFilename pathExtension]
            stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
        NSString *filenameWithoutExtension = [[[normalizedFilename lastPathComponent] stringByDeletingPathExtension]
            stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

        // If the filename has not file extension, deduce one
        // from the MIME type.
        if (fileExtension.length < 1) {
            fileExtension = [self fileExtensionForMIMEType:contentType];
            if (fileExtension.length < 1) {
                fileExtension = kDefaultFileExtension;
            }
        }
        fileExtension = [fileExtension lowercaseString];

        if (filenameWithoutExtension.length > 0) {
            // Store the file in a subdirectory whose name is the uniqueId of this attachment,
            // to avoid collisions between multiple attachments with the same name.
            NSString *attachmentFolderPath = [folder stringByAppendingPathComponent:uniqueId];
            if (![OWSFileSystem ensureDirectoryExists:attachmentFolderPath]) {
                return nil;
            }
            return [attachmentFolderPath
                stringByAppendingPathComponent:[NSString
                                                   stringWithFormat:@"%@.%@", filenameWithoutExtension, fileExtension]];
        }
    }

    if ([self isVideo:contentType]) {
        return [MIMETypeUtil filePathForVideo:uniqueId ofMIMEType:contentType inFolder:folder];
    } else if ([self isAudio:contentType]) {
        return [MIMETypeUtil filePathForAudio:uniqueId ofMIMEType:contentType inFolder:folder];
    } else if ([self isImage:contentType]) {
        return [MIMETypeUtil filePathForImage:uniqueId ofMIMEType:contentType inFolder:folder];
    } else if ([self isAnimated:contentType]) {
        return [MIMETypeUtil filePathForAnimated:uniqueId ofMIMEType:contentType inFolder:folder];
    } else if ([self isBinaryData:contentType]) {
        return [MIMETypeUtil filePathForBinaryData:uniqueId ofMIMEType:contentType inFolder:folder];
    } else if ([contentType isEqualToString:OWSMimeTypeUnknownForTests]) {
        // This file extension is arbitrary - it should never be exposed to the user or
        // be used outside the app.
        return [self filePathForData:uniqueId withFileExtension:@"unknown" inFolder:folder];
    }

    NSString *fileExtension = [self fileExtensionForMIMEType:contentType];
    if (fileExtension) {
        return [self filePathForData:uniqueId withFileExtension:fileExtension inFolder:folder];
    }

    // Use a fallback file extension.
    return [self filePathForData:uniqueId withFileExtension:kDefaultFileExtension inFolder:folder];
}

+ (NSString *)filePathForImage:(NSString *)uniqueId ofMIMEType:(NSString *)contentType inFolder:(NSString *)folder {
    return [self filePathForData:uniqueId
               withFileExtension:[self getSupportedExtensionFromImageMIMEType:contentType]
                        inFolder:folder];
}

+ (NSString *)filePathForVideo:(NSString *)uniqueId ofMIMEType:(NSString *)contentType inFolder:(NSString *)folder {
    return [self filePathForData:uniqueId
               withFileExtension:[self getSupportedExtensionFromVideoMIMEType:contentType]
                        inFolder:folder];
}

+ (NSString *)filePathForAudio:(NSString *)uniqueId ofMIMEType:(NSString *)contentType inFolder:(NSString *)folder {
    return [self filePathForData:uniqueId
               withFileExtension:[self getSupportedExtensionFromAudioMIMEType:contentType]
                        inFolder:folder];
}

+ (NSString *)filePathForAnimated:(NSString *)uniqueId ofMIMEType:(NSString *)contentType inFolder:(NSString *)folder {
    return [self filePathForData:uniqueId
               withFileExtension:[self getSupportedExtensionFromAnimatedMIMEType:contentType]
                        inFolder:folder];
}

+ (NSString *)filePathForBinaryData:(NSString *)uniqueId ofMIMEType:(NSString *)contentType inFolder:(NSString *)folder
{
    return [self filePathForData:uniqueId
               withFileExtension:[self getSupportedExtensionFromBinaryDataMIMEType:contentType]
                        inFolder:folder];
}

+ (NSString *)filePathForData:(NSString *)uniqueId
            withFileExtension:(NSString *)fileExtension
                     inFolder:(NSString *)folder
{
    return [folder stringByAppendingPathComponent:[uniqueId stringByAppendingPathExtension:fileExtension]];
}

+ (nullable NSString *)utiTypeForMIMEType:(NSString *)mimeType
{
    NSString *utiType = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(
        kUTTagClassMIMEType, (__bridge CFStringRef)mimeType, NULL);

    if (!utiType) {
        if ([mimeType isEqualToString:@"audio/amr"]) {
            utiType = @"org.3gpp.adaptive-multi-rate-audio";
        } else if ([mimeType isEqualToString:@"audio/mp3"] || [mimeType isEqualToString:@"audio/x-mpeg"] ||
            [mimeType isEqualToString:@"audio/mpeg"] || [mimeType isEqualToString:@"audio/mpeg3"] ||
            [mimeType isEqualToString:@"audio/x-mp3"] || [mimeType isEqualToString:@"audio/x-mpeg3"]) {
            utiType = (NSString *)kUTTypeMP3;
        } else if ([mimeType isEqualToString:@"audio/aac"] || [mimeType isEqualToString:@"audio/x-m4a"]) {
            utiType = (NSString *)kUTTypeMPEG4Audio;
        } else if ([mimeType isEqualToString:@"audio/aiff"] || [mimeType isEqualToString:@"audio/x-aiff"]) {
            utiType = (NSString *)kUTTypeAudioInterchangeFileFormat;
        }
    }

    return utiType;
}

+ (nullable NSString *)fileExtensionForUTIType:(NSString *)utiType
{
    // Special-case the "aac" filetype we use for voice messages (for legacy reasons)
    // to use a .m4a file extension, not .aac, since AVAudioPlayer can't handle .aac
    // properly. Doesn't affect file contents.
    if ([utiType isEqualToString:@"public.aac-audio"]) {
        return @"m4a";
    }
    CFStringRef fileExtension
        = UTTypeCopyPreferredTagWithClass((__bridge CFStringRef)utiType, kUTTagClassFilenameExtension);
    return (__bridge_transfer NSString *)fileExtension;
}

+ (nullable NSString *)fileExtensionForMIMETypeViaUTIType:(NSString *)mimeType
{
    NSString *utiType = [self utiTypeForMIMEType:mimeType];
    if (!utiType) {
        return nil;
    }
    NSString *fileExtension = [self fileExtensionForUTIType:utiType];
    return fileExtension;
}

+ (NSSet<NSString *> *)utiTypesForMIMETypes:(NSArray *)mimeTypes
{
    NSMutableSet<NSString *> *result = [NSMutableSet new];
    for (NSString *mimeType in mimeTypes) {
        NSString *_Nullable utiType = [self utiTypeForMIMEType:mimeType];
        if (!utiType) { continue; }
        [result addObject:utiType];
    }
    return result;
}

+ (NSSet<NSString *> *)supportedVideoUTITypes
{
    static NSSet<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self utiTypesForMIMETypes:[self supportedVideoMIMETypesToExtensionTypes].allKeys];
    });
    return result;
}

+ (NSSet<NSString *> *)supportedAudioUTITypes
{
    static NSSet<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self utiTypesForMIMETypes:[self supportedAudioMIMETypesToExtensionTypes].allKeys];
    });
    return result;
}

+ (NSSet<NSString *> *)supportedImageUTITypes
{
    static NSSet<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self utiTypesForMIMETypes:[self supportedImageMIMETypesToExtensionTypes].allKeys];
    });
    return result;
}

+ (NSSet<NSString *> *)supportedAnimatedImageUTITypes
{
    static NSSet<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self utiTypesForMIMETypes:[self supportedAnimatedMIMETypesToExtensionTypes].allKeys];
    });
    return result;
}

+ (NSArray<NSString *> *)supportedImageMIMETypes
{
    static NSArray<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self supportedImageMIMETypesToExtensionTypes].allKeys;
    });
    return result;
}

+ (NSArray<NSString *> *)supportedAnimatedImageMIMETypes
{
    static NSArray<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self supportedAnimatedMIMETypesToExtensionTypes].allKeys;
    });
    return result;
}

+ (NSArray<NSString *> *)supportedVideoMIMETypes
{
    static NSArray<NSString *> *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = [self supportedVideoMIMETypesToExtensionTypes].allKeys;
    });
    return result;
}

+ (NSDictionary *)genericMIMETypesToExtensionTypes
{
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"application/acad" : @"dwg",
            @"application/andrew-inset" : @"ez",
            @"application/applixware" : @"aw",
            @"application/arj" : @"arj",
            @"application/atom+xml" : @"atom",
            @"application/atomcat+xml" : @"atomcat",
            @"application/atomsvc+xml" : @"atomsvc",
            @"application/binhex" : @"hqx",
            @"application/binhex4" : @"hqx",
            @"application/book" : @"book",
            @"application/ccxml+xml" : @"ccxml",
            @"application/cdf" : @"cdf",
            @"application/cdmi-capability" : @"cdmia",
            @"application/cdmi-container" : @"cdmic",
            @"application/cdmi-domain" : @"cdmid",
            @"application/cdmi-object" : @"cdmio",
            @"application/cdmi-queue" : @"cdmiq",
            @"application/clariscad" : @"ccad",
            @"application/commonground" : @"dp",
            @"application/cu-seeme" : @"cu",
            @"application/davmount+xml" : @"davmount",
            @"application/docbook+xml" : @"dbk",
            @"application/drafting" : @"drw",
            @"application/dsptype" : @"tsp",
            @"application/dssc+der" : @"dssc",
            @"application/dssc+xml" : @"xdssc",
            @"application/dxf" : @"dxf",
            @"application/ecmascript" : @"js",
            @"application/emma+xml" : @"emma",
            @"application/envoy" : @"evy",
            @"application/epub+zip" : @"epub",
            @"application/excel" : @"xls",
            @"application/exi" : @"exi",
            @"application/font-tdpfr" : @"pfr",
            @"application/font-woff" : @"woff",
            @"application/fractals" : @"fif",
            @"application/freeloader" : @"frl",
            @"application/futuresplash" : @"spl",
            @"application/gml+xml" : @"gml",
            @"application/gnutar" : @"tgz",
            @"application/gpx+xml" : @"gpx",
            @"application/groupwise" : @"vew",
            @"application/gxf" : @"gxf",
            @"application/hlp" : @"hlp",
            @"application/hta" : @"hta",
            @"application/hyperstudio" : @"stk",
            @"application/i-deas" : @"unv",
            @"application/iges" : @"iges",
            @"application/inf" : @"inf",
            @"application/inkml+xml" : @"ink",
            @"application/internet-property-stream" : @"acx",
            @"application/ipfix" : @"ipfix",
            @"application/java" : @"class",
            @"application/java-archive" : @"jar",
            @"application/java-byte-code" : @"class",
            @"application/java-serialized-object" : @"ser",
            @"application/java-vm" : @"class",
            @"application/javascript" : @"js",
            @"application/json" : @"json",
            @"application/jsonml+json" : @"jsonml",
            @"application/lha" : @"lha",
            @"application/lost+xml" : @"lostxml",
            @"application/lzx" : @"lzx",
            @"application/mac-binary" : @"bin",
            @"application/mac-binhex" : @"hqx",
            @"application/mac-binhex40" : @"hqx",
            @"application/mac-compactpro" : @"cpt",
            @"application/macbinary" : @"bin",
            @"application/mads+xml" : @"mads",
            @"application/marc" : @"mrc",
            @"application/marcxml+xml" : @"mrcx",
            @"application/mathematica" : @"ma",
            @"application/mathml+xml" : @"mathml",
            @"application/mbedlet" : @"mbd",
            @"application/mbox" : @"mbox",
            @"application/mcad" : @"mcd",
            @"application/mediaservercontrol+xml" : @"mscml",
            @"application/metalink+xml" : @"metalink",
            @"application/metalink4+xml" : @"meta4",
            @"application/mets+xml" : @"mets",
            @"application/mime" : @"aps",
            @"application/mods+xml" : @"mods",
            @"application/mp21" : @"m21",
            @"application/mp4" : @"mp4",
            @"application/mspowerpoint" : @"ppt",
            @"application/msword" : @"doc",
            @"application/mswrite" : @"wri",
            @"application/mxf" : @"mxf",
            @"application/netmc" : @"mcp",
            @"application/octet-stream" : @"bin",
            @"application/oda" : @"oda",
            @"application/oebps-package+xml" : @"opf",
            @"application/ogg" : @"oga",
            @"application/olescript" : @"axs",
            @"application/omdoc+xml" : @"omdoc",
            @"application/onenote" : @"onetoc",
            @"application/oxps" : @"oxps",
            @"application/patch-ops-error+xml" : @"xer",
            @"application/pdf" : @"pdf",
            @"application/pgp-encrypted" : @"pgp",
            @"application/pgp-signature" : @"sig",
            @"application/pics-rules" : @"prf",
            @"application/pkcs-12" : @"p12",
            @"application/pkcs-crl" : @"crl",
            @"application/pkcs10" : @"p10",
            @"application/pkcs7-mime" : @"p7m",
            @"application/pkcs7-signature" : @"p7s",
            @"application/pkcs8" : @"p8",
            @"application/pkix-attr-cert" : @"ac",
            @"application/pkix-cert" : @"cer",
            @"application/pkix-crl" : @"crl",
            @"application/pkix-pkipath" : @"pkipath",
            @"application/pkixcmp" : @"pki",
            @"application/plain" : @"text",
            @"application/pls+xml" : @"pls",
            @"application/postscript" : @"ps",
            @"application/powerpoint" : @"ppt",
            @"application/prs.cww" : @"cww",
            @"application/pskc+xml" : @"pskcxml",
            @"application/rdf+xml" : @"rdf",
            @"application/reginfo+xml" : @"rif",
            @"application/relax-ng-compact-syntax" : @"rnc",
            @"application/resource-lists+xml" : @"rl",
            @"application/resource-lists-diff+xml" : @"rld",
            @"application/ringing-tones" : @"rng",
            @"application/rls-services+xml" : @"rs",
            @"application/rpki-ghostbusters" : @"gbr",
            @"application/rpki-manifest" : @"mft",
            @"application/rpki-roa" : @"roa",
            @"application/rsd+xml" : @"rsd",
            @"application/rss+xml" : @"rss",
            @"application/rtf" : @"rtf",
            @"application/sbml+xml" : @"sbml",
            @"application/scvp-cv-request" : @"scq",
            @"application/scvp-cv-response" : @"scs",
            @"application/scvp-vp-request" : @"spq",
            @"application/scvp-vp-response" : @"spp",
            @"application/sdp" : @"sdp",
            @"application/sea" : @"sea",
            @"application/set" : @"set",
            @"application/set-payment-initiation" : @"setpay",
            @"application/set-registration-initiation" : @"setreg",
            @"application/shf+xml" : @"shf",
            @"application/sla" : @"stl",
            @"application/smil" : @"smi",
            @"application/smil+xml" : @"smi",
            @"application/solids" : @"sol",
            @"application/sounder" : @"sdr",
            @"application/sparql-query" : @"rq",
            @"application/sparql-results+xml" : @"srx",
            @"application/srgs" : @"gram",
            @"application/srgs+xml" : @"grxml",
            @"application/sru+xml" : @"sru",
            @"application/ssdl+xml" : @"ssdl",
            @"application/ssml+xml" : @"ssml",
            @"application/step" : @"step",
            @"application/streamingmedia" : @"ssm",
            @"application/tei+xml" : @"tei",
            @"application/thraud+xml" : @"tfi",
            @"application/timestamped-data" : @"tsd",
            @"application/toolbook" : @"tbk",
            @"application/vda" : @"vda",
            @"application/vnd.3gpp.pic-bw-large" : @"plb",
            @"application/vnd.3gpp.pic-bw-small" : @"psb",
            @"application/vnd.3gpp.pic-bw-var" : @"pvb",
            @"application/vnd.3gpp2.tcap" : @"tcap",
            @"application/vnd.3m.post-it-notes" : @"pwn",
            @"application/vnd.accpac.simply.aso" : @"aso",
            @"application/vnd.accpac.simply.imp" : @"imp",
            @"application/vnd.acucobol" : @"acu",
            @"application/vnd.acucorp" : @"atc",
            @"application/vnd.adobe.air-application-installer-package+zip" : @"air",
            @"application/vnd.adobe.formscentral.fcdt" : @"fcdt",
            @"application/vnd.adobe.fxp" : @"fxp",
            @"application/vnd.adobe.xdp+xml" : @"xdp",
            @"application/vnd.adobe.xfdf" : @"xfdf",
            @"application/vnd.ahead.space" : @"ahead",
            @"application/vnd.airzip.filesecure.azf" : @"azf",
            @"application/vnd.airzip.filesecure.azs" : @"azs",
            @"application/vnd.amazon.ebook" : @"azw",
            @"application/vnd.americandynamics.acc" : @"acc",
            @"application/vnd.amiga.ami" : @"ami",
            @"application/vnd.android.package-archive" : @"apk",
            @"application/vnd.anser-web-certificate-issue-initiation" : @"cii",
            @"application/vnd.anser-web-funds-transfer-initiation" : @"fti",
            @"application/vnd.antix.game-component" : @"atx",
            @"application/vnd.apple.installer+xml" : @"mpkg",
            @"application/vnd.apple.mpegurl" : @"m3u8",
            @"application/vnd.aristanetworks.swi" : @"swi",
            @"application/vnd.astraea-software.iota" : @"iota",
            @"application/vnd.audiograph" : @"aep",
            @"application/vnd.blueice.multipass" : @"mpm",
            @"application/vnd.bmi" : @"bmi",
            @"application/vnd.businessobjects" : @"rep",
            @"application/vnd.chemdraw+xml" : @"cdxml",
            @"application/vnd.chipnuts.karaoke-mmd" : @"mmd",
            @"application/vnd.cinderella" : @"cdy",
            @"application/vnd.claymore" : @"cla",
            @"application/vnd.cloanto.rp9" : @"rp9",
            @"application/vnd.clonk.c4group" : @"c4g",
            @"application/vnd.cluetrust.cartomobile-config" : @"c11amc",
            @"application/vnd.cluetrust.cartomobile-config-pkg" : @"c11amz",
            @"application/vnd.commonspace" : @"csp",
            @"application/vnd.contact.cmsg" : @"cdbcmsg",
            @"application/vnd.cosmocaller" : @"cmc",
            @"application/vnd.crick.clicker" : @"clkx",
            @"application/vnd.crick.clicker.keyboard" : @"clkk",
            @"application/vnd.crick.clicker.palette" : @"clkp",
            @"application/vnd.crick.clicker.template" : @"clkt",
            @"application/vnd.crick.clicker.wordbank" : @"clkw",
            @"application/vnd.criticaltools.wbs+xml" : @"wbs",
            @"application/vnd.ctc-posml" : @"pml",
            @"application/vnd.cups-ppd" : @"ppd",
            @"application/vnd.curl.car" : @"car",
            @"application/vnd.curl.pcurl" : @"pcurl",
            @"application/vnd.dart" : @"dart",
            @"application/vnd.data-vision.rdz" : @"rdz",
            @"application/vnd.dece.data" : @"uvf",
            @"application/vnd.dece.ttml+xml" : @"uvt",
            @"application/vnd.dece.unspecified" : @"uvx",
            @"application/vnd.dece.zip" : @"uvz",
            @"application/vnd.denovo.fcselayout-link" : @"fe_launch",
            @"application/vnd.dna" : @"dna",
            @"application/vnd.dolby.mlp" : @"mlp",
            @"application/vnd.dpgraph" : @"dpg",
            @"application/vnd.dreamfactory" : @"dfac",
            @"application/vnd.ds-keypoint" : @"kpxx",
            @"application/vnd.dvb.ait" : @"ait",
            @"application/vnd.dvb.service" : @"svc",
            @"application/vnd.dynageo" : @"geo",
            @"application/vnd.ecowin.chart" : @"mag",
            @"application/vnd.enliven" : @"nml",
            @"application/vnd.epson.esf" : @"esf",
            @"application/vnd.epson.msf" : @"msf",
            @"application/vnd.epson.quickanime" : @"qam",
            @"application/vnd.epson.salt" : @"slt",
            @"application/vnd.epson.ssf" : @"ssf",
            @"application/vnd.eszigno3+xml" : @"es3",
            @"application/vnd.ezpix-album" : @"ez2",
            @"application/vnd.ezpix-package" : @"ez3",
            @"application/vnd.fdf" : @"fdf",
            @"application/vnd.fdsn.mseed" : @"mseed",
            @"application/vnd.fdsn.seed" : @"seed",
            @"application/vnd.flographit" : @"gph",
            @"application/vnd.fluxtime.clip" : @"ftc",
            @"application/vnd.framemaker" : @"fm",
            @"application/vnd.frogans.fnc" : @"fnc",
            @"application/vnd.frogans.ltf" : @"ltf",
            @"application/vnd.fsc.weblaunch" : @"fsc",
            @"application/vnd.fujitsu.oasys" : @"oas",
            @"application/vnd.fujitsu.oasys2" : @"oa2",
            @"application/vnd.fujitsu.oasys3" : @"oa3",
            @"application/vnd.fujitsu.oasysgp" : @"fg5",
            @"application/vnd.fujitsu.oasysprs" : @"bh2",
            @"application/vnd.fujixerox.ddd" : @"ddd",
            @"application/vnd.fujixerox.docuworks" : @"xdw",
            @"application/vnd.fujixerox.docuworks.binder" : @"xbd",
            @"application/vnd.fuzzysheet" : @"fzs",
            @"application/vnd.genomatix.tuxedo" : @"txd",
            @"application/vnd.geogebra.file" : @"ggb",
            @"application/vnd.geogebra.tool" : @"ggt",
            @"application/vnd.geometry-explorer" : @"gex",
            @"application/vnd.geonext" : @"gxt",
            @"application/vnd.geoplan" : @"g2w",
            @"application/vnd.geospace" : @"g3w",
            @"application/vnd.gmx" : @"gmx",
            @"application/vnd.google-earth.kml+xml" : @"kml",
            @"application/vnd.google-earth.kmz" : @"kmz",
            @"application/vnd.grafeq" : @"gqf",
            @"application/vnd.groove-account" : @"gac",
            @"application/vnd.groove-help" : @"ghf",
            @"application/vnd.groove-identity-message" : @"gim",
            @"application/vnd.groove-injector" : @"grv",
            @"application/vnd.groove-tool-message" : @"gtm",
            @"application/vnd.groove-tool-template" : @"tpl",
            @"application/vnd.groove-vcard" : @"vcg",
            @"application/vnd.hal+xml" : @"hal",
            @"application/vnd.handheld-entertainment+xml" : @"zmm",
            @"application/vnd.hbci" : @"hbci",
            @"application/vnd.hhe.lesson-player" : @"les",
            @"application/vnd.hp-hpgl" : @"hpgl",
            @"application/vnd.hp-hpid" : @"hpid",
            @"application/vnd.hp-hps" : @"hps",
            @"application/vnd.hp-jlyt" : @"jlt",
            @"application/vnd.hp-pcl" : @"pcl",
            @"application/vnd.hp-pclxl" : @"pclxl",
            @"application/vnd.hydrostatix.sof-data" : @"sfd-hdstx",
            @"application/vnd.ibm.minipay" : @"mpy",
            @"application/vnd.ibm.modcap" : @"afp",
            @"application/vnd.ibm.rights-management" : @"irm",
            @"application/vnd.ibm.secure-container" : @"sc",
            @"application/vnd.iccprofile" : @"icc",
            @"application/vnd.igloader" : @"igl",
            @"application/vnd.immervision-ivp" : @"ivp",
            @"application/vnd.immervision-ivu" : @"ivu",
            @"application/vnd.insors.igm" : @"igm",
            @"application/vnd.intercon.formnet" : @"xpw",
            @"application/vnd.intergeo" : @"i2g",
            @"application/vnd.intu.qbo" : @"qbo",
            @"application/vnd.intu.qfx" : @"qfx",
            @"application/vnd.ipunplugged.rcprofile" : @"rcprofile",
            @"application/vnd.irepository.package+xml" : @"irp",
            @"application/vnd.is-xpr" : @"xpr",
            @"application/vnd.isac.fcs" : @"fcs",
            @"application/vnd.jam" : @"jam",
            @"application/vnd.jcp.javame.midlet-rms" : @"rms",
            @"application/vnd.jisp" : @"jisp",
            @"application/vnd.joost.joda-archive" : @"joda",
            @"application/vnd.kahootz" : @"ktz",
            @"application/vnd.kde.karbon" : @"karbon",
            @"application/vnd.kde.kchart" : @"chrt",
            @"application/vnd.kde.kformula" : @"kfo",
            @"application/vnd.kde.kivio" : @"flw",
            @"application/vnd.kde.kontour" : @"kon",
            @"application/vnd.kde.kpresenter" : @"kpr",
            @"application/vnd.kde.kspread" : @"ksp",
            @"application/vnd.kde.kword" : @"kwd",
            @"application/vnd.kenameaapp" : @"htke",
            @"application/vnd.kidspiration" : @"kia",
            @"application/vnd.kinar" : @"kne",
            @"application/vnd.koan" : @"skp",
            @"application/vnd.kodak-descriptor" : @"sse",
            @"application/vnd.las.las+xml" : @"lasxml",
            @"application/vnd.llamagraphics.life-balance.desktop" : @"lbd",
            @"application/vnd.llamagraphics.life-balance.exchange+xml" : @"lbe",
            @"application/vnd.lotus-1-2-3" : @"123",
            @"application/vnd.lotus-approach" : @"apr",
            @"application/vnd.lotus-freelance" : @"pre",
            @"application/vnd.lotus-notes" : @"nsf",
            @"application/vnd.lotus-organizer" : @"org",
            @"application/vnd.lotus-screencam" : @"scm",
            @"application/vnd.lotus-wordpro" : @"lwp",
            @"application/vnd.macports.portpkg" : @"portpkg",
            @"application/vnd.mcd" : @"mcd",
            @"application/vnd.medcalcdata" : @"mc1",
            @"application/vnd.mediastation.cdkey" : @"cdkey",
            @"application/vnd.mfer" : @"mwf",
            @"application/vnd.mfmp" : @"mfm",
            @"application/vnd.micrografx.flo" : @"flo",
            @"application/vnd.micrografx.igx" : @"igx",
            @"application/vnd.mif" : @"mif",
            @"application/vnd.mobius.daf" : @"daf",
            @"application/vnd.mobius.dis" : @"dis",
            @"application/vnd.mobius.mbk" : @"mbk",
            @"application/vnd.mobius.mqy" : @"mqy",
            @"application/vnd.mobius.msl" : @"msl",
            @"application/vnd.mobius.plc" : @"plc",
            @"application/vnd.mobius.txf" : @"txf",
            @"application/vnd.mophun.application" : @"mpn",
            @"application/vnd.mophun.certificate" : @"mpc",
            @"application/vnd.mozilla.xul+xml" : @"xul",
            @"application/vnd.ms-artgalry" : @"cil",
            @"application/vnd.ms-cab-compressed" : @"cab",
            @"application/vnd.ms-excel" : @"xls",
            @"application/vnd.ms-excel.addin.macroenabled.12" : @"xlam",
            @"application/vnd.ms-excel.sheet.binary.macroenabled.12" : @"xlsb",
            @"application/vnd.ms-excel.sheet.macroenabled.12" : @"xlsm",
            @"application/vnd.ms-excel.template.macroenabled.12" : @"xltm",
            @"application/vnd.ms-fontobject" : @"eot",
            @"application/vnd.ms-htmlhelp" : @"chm",
            @"application/vnd.ms-ims" : @"ims",
            @"application/vnd.ms-lrm" : @"lrm",
            @"application/vnd.ms-officetheme" : @"thmx",
            @"application/vnd.ms-outlook" : @"msg",
            @"application/vnd.ms-pki.certstore" : @"sst",
            @"application/vnd.ms-pki.pko" : @"pko",
            @"application/vnd.ms-pki.seccat" : @"cat",
            @"application/vnd.ms-pki.stl" : @"stl",
            @"application/vnd.ms-pkicertstore" : @"sst",
            @"application/vnd.ms-pkiseccat" : @"cat",
            @"application/vnd.ms-pkistl" : @"stl",
            @"application/vnd.ms-powerpoint" : @"ppt",
            @"application/vnd.ms-powerpoint.addin.macroenabled.12" : @"ppam",
            @"application/vnd.ms-powerpoint.presentation.macroenabled.12" : @"pptm",
            @"application/vnd.ms-powerpoint.slide.macroenabled.12" : @"sldm",
            @"application/vnd.ms-powerpoint.slideshow.macroenabled.12" : @"ppsm",
            @"application/vnd.ms-powerpoint.template.macroenabled.12" : @"potm",
            @"application/vnd.ms-project" : @"mpp",
            @"application/vnd.ms-word.document.macroenabled.12" : @"docm",
            @"application/vnd.ms-word.template.macroenabled.12" : @"dotm",
            @"application/vnd.ms-works" : @"wps",
            @"application/vnd.ms-wpl" : @"wpl",
            @"application/vnd.ms-xpsdocument" : @"xps",
            @"application/vnd.mseq" : @"mseq",
            @"application/vnd.musician" : @"mus",
            @"application/vnd.muvee.style" : @"msty",
            @"application/vnd.mynfc" : @"taglet",
            @"application/vnd.neurolanguage.nlu" : @"nlu",
            @"application/vnd.nitf" : @"ntf",
            @"application/vnd.noblenet-directory" : @"nnd",
            @"application/vnd.noblenet-sealer" : @"nns",
            @"application/vnd.noblenet-web" : @"nnw",
            @"application/vnd.nokia.configuration-message" : @"ncm",
            @"application/vnd.nokia.n-gage.data" : @"ngdat",
            @"application/vnd.nokia.n-gage.symbian.install" : @"n-gage",
            @"application/vnd.nokia.radio-preset" : @"rpst",
            @"application/vnd.nokia.radio-presets" : @"rpss",
            @"application/vnd.nokia.ringing-tone" : @"rng",
            @"application/vnd.novadigm.edm" : @"edm",
            @"application/vnd.novadigm.edx" : @"edx",
            @"application/vnd.novadigm.ext" : @"ext",
            @"application/vnd.oasis.opendocument.chart" : @"odc",
            @"application/vnd.oasis.opendocument.chart-template" : @"otc",
            @"application/vnd.oasis.opendocument.database" : @"odb",
            @"application/vnd.oasis.opendocument.formula" : @"odf",
            @"application/vnd.oasis.opendocument.formula-template" : @"odft",
            @"application/vnd.oasis.opendocument.graphics" : @"odg",
            @"application/vnd.oasis.opendocument.graphics-template" : @"otg",
            @"application/vnd.oasis.opendocument.image" : @"odi",
            @"application/vnd.oasis.opendocument.image-template" : @"oti",
            @"application/vnd.oasis.opendocument.presentation" : @"odp",
            @"application/vnd.oasis.opendocument.presentation-template" : @"otp",
            @"application/vnd.oasis.opendocument.spreadsheet" : @"ods",
            @"application/vnd.oasis.opendocument.spreadsheet-template" : @"ots",
            @"application/vnd.oasis.opendocument.text" : @"odt",
            @"application/vnd.oasis.opendocument.text-master" : @"odm",
            @"application/vnd.oasis.opendocument.text-template" : @"ott",
            @"application/vnd.oasis.opendocument.text-web" : @"oth",
            @"application/vnd.olpc-sugar" : @"xo",
            @"application/vnd.oma.dd2+xml" : @"dd2",
            @"application/vnd.openofficeorg.extension" : @"oxt",
            @"application/vnd.openxmlformats-officedocument.presentationml.presentation" : @"pptx",
            @"application/vnd.openxmlformats-officedocument.presentationml.slide" : @"sldx",
            @"application/vnd.openxmlformats-officedocument.presentationml.slideshow" : @"ppsx",
            @"application/vnd.openxmlformats-officedocument.presentationml.template" : @"potx",
            @"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" : @"xlsx",
            @"application/vnd.openxmlformats-officedocument.spreadsheetml.template" : @"xltx",
            @"application/vnd.openxmlformats-officedocument.wordprocessingml.document" : @"docx",
            @"application/vnd.openxmlformats-officedocument.wordprocessingml.template" : @"dotx",
            @"application/vnd.osgeo.mapguide.package" : @"mgp",
            @"application/vnd.osgi.dp" : @"dp",
            @"application/vnd.osgi.subsystem" : @"esa",
            @"application/vnd.palm" : @"pdb",
            @"application/vnd.pawaafile" : @"paw",
            @"application/vnd.pg.format" : @"str",
            @"application/vnd.pg.osasli" : @"ei6",
            @"application/vnd.picsel" : @"efif",
            @"application/vnd.pmi.widget" : @"wg",
            @"application/vnd.pocketlearn" : @"plf",
            @"application/vnd.powerbuilder6" : @"pbd",
            @"application/vnd.previewsystems.box" : @"box",
            @"application/vnd.proteus.magazine" : @"mgz",
            @"application/vnd.publishare-delta-tree" : @"qps",
            @"application/vnd.pvi.ptid1" : @"ptid",
            @"application/vnd.quark.quarkxpress" : @"qxd",
            @"application/vnd.realvnc.bed" : @"bed",
            @"application/vnd.recordare.musicxml" : @"mxl",
            @"application/vnd.recordare.musicxml+xml" : @"musicxml",
            @"application/vnd.rig.cryptonote" : @"cryptonote",
            @"application/vnd.rim.cod" : @"cod",
            @"application/vnd.rn-realmedia" : @"rm",
            @"application/vnd.rn-realmedia-vbr" : @"rmvb",
            @"application/vnd.rn-realplayer" : @"rnx",
            @"application/vnd.route66.link66+xml" : @"link66",
            @"application/vnd.sailingtracker.track" : @"st",
            @"application/vnd.seemail" : @"see",
            @"application/vnd.sema" : @"sema",
            @"application/vnd.semd" : @"semd",
            @"application/vnd.semf" : @"semf",
            @"application/vnd.shana.informed.formdata" : @"ifm",
            @"application/vnd.shana.informed.formtemplate" : @"itp",
            @"application/vnd.shana.informed.interchange" : @"iif",
            @"application/vnd.shana.informed.package" : @"ipk",
            @"application/vnd.simtech-mindmapper" : @"twd",
            @"application/vnd.smaf" : @"mmf",
            @"application/vnd.smart.teacher" : @"teacher",
            @"application/vnd.solent.sdkm+xml" : @"sdkm",
            @"application/vnd.spotfire.dxp" : @"dxp",
            @"application/vnd.spotfire.sfs" : @"sfs",
            @"application/vnd.stardivision.calc" : @"sdc",
            @"application/vnd.stardivision.draw" : @"sda",
            @"application/vnd.stardivision.impress" : @"sdd",
            @"application/vnd.stardivision.math" : @"smf",
            @"application/vnd.stardivision.writer" : @"sdw",
            @"application/vnd.stardivision.writer-global" : @"sgl",
            @"application/vnd.stepmania.package" : @"smzip",
            @"application/vnd.stepmania.stepchart" : @"sm",
            @"application/vnd.sun.xml.calc" : @"sxc",
            @"application/vnd.sun.xml.calc.template" : @"stc",
            @"application/vnd.sun.xml.draw" : @"sxd",
            @"application/vnd.sun.xml.draw.template" : @"std",
            @"application/vnd.sun.xml.impress" : @"sxi",
            @"application/vnd.sun.xml.impress.template" : @"sti",
            @"application/vnd.sun.xml.math" : @"sxm",
            @"application/vnd.sun.xml.writer" : @"sxw",
            @"application/vnd.sun.xml.writer.global" : @"sxg",
            @"application/vnd.sun.xml.writer.template" : @"stw",
            @"application/vnd.sus-calendar" : @"sus",
            @"application/vnd.svd" : @"svd",
            @"application/vnd.symbian.install" : @"sis",
            @"application/vnd.syncml+xml" : @"xsm",
            @"application/vnd.syncml.dm+wbxml" : @"bdm",
            @"application/vnd.syncml.dm+xml" : @"xdm",
            @"application/vnd.tao.intent-module-archive" : @"tao",
            @"application/vnd.tcpdump.pcap" : @"pcap",
            @"application/vnd.tmobile-livetv" : @"tmo",
            @"application/vnd.trid.tpt" : @"tpt",
            @"application/vnd.triscape.mxs" : @"mxs",
            @"application/vnd.trueapp" : @"tra",
            @"application/vnd.ufdl" : @"ufd",
            @"application/vnd.uiq.theme" : @"utz",
            @"application/vnd.umajin" : @"umj",
            @"application/vnd.unity" : @"unityweb",
            @"application/vnd.uoml+xml" : @"uoml",
            @"application/vnd.vcx" : @"vcx",
            @"application/vnd.visio" : @"vsd",
            @"application/vnd.visio2013" : @"vsdx",
            @"application/vnd.visionary" : @"vis",
            @"application/vnd.vsf" : @"vsf",
            @"application/vnd.wap.wbxml" : @"wbxml",
            @"application/vnd.wap.wmlc" : @"wmlc",
            @"application/vnd.wap.wmlscriptc" : @"wmlsc",
            @"application/vnd.webturbo" : @"wtb",
            @"application/vnd.wolfram.player" : @"nbp",
            @"application/vnd.wordperfect" : @"wpd",
            @"application/vnd.wqd" : @"wqd",
            @"application/vnd.wt.stf" : @"stf",
            @"application/vnd.xara" : @"xar",
            @"application/vnd.xfdl" : @"xfdl",
            @"application/vnd.yamaha.hv-dic" : @"hvd",
            @"application/vnd.yamaha.hv-script" : @"hvs",
            @"application/vnd.yamaha.hv-voice" : @"hvp",
            @"application/vnd.yamaha.openscoreformat" : @"osf",
            @"application/vnd.yamaha.openscoreformat.osfpvg+xml" : @"osfpvg",
            @"application/vnd.yamaha.smaf-audio" : @"saf",
            @"application/vnd.yamaha.smaf-phrase" : @"spf",
            @"application/vnd.yellowriver-custom-menu" : @"cmp",
            @"application/vnd.zul" : @"zir",
            @"application/vnd.zzazz.deck+xml" : @"zaz",
            @"application/vocaltec-media-desc" : @"vmd",
            @"application/vocaltec-media-file" : @"vmf",
            @"application/voicexml+xml" : @"vxml",
            @"application/widget" : @"wgt",
            @"application/winhlp" : @"hlp",
            @"application/wordperfect" : @"wp",
            @"application/wordperfect6.0" : @"w60",
            @"application/wordperfect6.1" : @"w61",
            @"application/wsdl+xml" : @"wsdl",
            @"application/wspolicy+xml" : @"wspolicy",
            @"application/x-123" : @"wk1",
            @"application/x-7z-compressed" : @"7z",
            @"application/x-abiword" : @"abw",
            @"application/x-ace-compressed" : @"ace",
            @"application/x-aim" : @"aim",
            @"application/x-apple-diskimage" : @"dmg",
            @"application/x-authorware-bin" : @"aab",
            @"application/x-authorware-map" : @"aam",
            @"application/x-authorware-seg" : @"aas",
            @"application/x-bcpio" : @"bcpio",
            @"application/x-binary" : @"bin",
            @"application/x-binhex40" : @"hqx",
            @"application/x-bittorrent" : @"torrent",
            @"application/x-blorb" : @"blb",
            @"application/x-bsh" : @"sh",
            @"application/x-bytecode.elisp" : @"elc",
            @"application/x-bytecode.python" : @"pyc",
            @"application/x-bzip" : @"bz",
            @"application/x-bzip2" : @"bz2",
            @"application/x-cbr" : @"cbr",
            @"application/x-cdf" : @"cdf",
            @"application/x-cdlink" : @"vcd",
            @"application/x-cfs-compressed" : @"cfs",
            @"application/x-chat" : @"chat",
            @"application/x-chess-pgn" : @"pgn",
            @"application/x-cmu-raster" : @"ras",
            @"application/x-cocoa" : @"cco",
            @"application/x-compactpro" : @"cpt",
            @"application/x-compress" : @"z",
            @"application/x-conference" : @"nsc",
            @"application/x-cpio" : @"cpio",
            @"application/x-cpt" : @"cpt",
            @"application/x-csh" : @"csh",
            @"application/x-debian-package" : @"deb",
            @"application/x-deepv" : @"deepv",
            @"application/x-dgc-compressed" : @"dgc",
            @"application/x-director" : @"dir",
            @"application/x-doom" : @"wad",
            @"application/x-dtbncx+xml" : @"ncx",
            @"application/x-dtbook+xml" : @"dtb",
            @"application/x-dtbresource+xml" : @"res",
            @"application/x-dvi" : @"dvi",
            @"application/x-elc" : @"elc",
            @"application/x-envoy" : @"evy",
            @"application/x-esrehber" : @"es",
            @"application/x-eva" : @"eva",
            @"application/x-excel" : @"xls",
            @"application/x-font-bdf" : @"bdf",
            @"application/x-font-ghostscript" : @"gsf",
            @"application/x-font-linux-psf" : @"psf",
            @"application/x-font-otf" : @"otf",
            @"application/x-font-pcf" : @"pcf",
            @"application/x-font-snf" : @"snf",
            @"application/x-font-ttf" : @"ttf",
            @"application/x-font-type1" : @"pfa",
            @"application/x-font-woff" : @"woff",
            @"application/x-frame" : @"mif",
            @"application/x-freearc" : @"arc",
            @"application/x-freelance" : @"pre",
            @"application/x-futuresplash" : @"spl",
            @"application/x-gca-compressed" : @"gca",
            @"application/x-glulx" : @"ulx",
            @"application/x-gnumeric" : @"gnumeric",
            @"application/x-gramps-xml" : @"gramps",
            @"application/x-gsp" : @"gsp",
            @"application/x-gss" : @"gss",
            @"application/x-gtar" : @"gtar",
            @"application/x-gzip" : @"gz",
            @"application/x-hdf" : @"hdf",
            @"application/x-httpd-imap" : @"imap",
            @"application/x-ima" : @"ima",
            @"application/x-install-instructions" : @"install",
            @"application/x-internett-signup" : @"ins",
            @"application/x-inventor" : @"iv",
            @"application/x-ip2" : @"ip",
            @"application/x-iphone" : @"iii",
            @"application/x-iso9660-image" : @"iso",
            @"application/x-java-class" : @"class",
            @"application/x-java-commerce" : @"jcm",
            @"application/x-java-jnlp-file" : @"jnlp",
            @"application/x-javascript" : @"js",
            @"application/x-ksh" : @"ksh",
            @"application/x-latex" : @"ltx",
            @"application/x-lha" : @"lha",
            @"application/x-lisp" : @"lsp",
            @"application/x-livescreen" : @"ivy",
            @"application/x-lotus" : @"wq1",
            @"application/x-lotusscreencam" : @"scm",
            @"application/x-lzh" : @"lzh",
            @"application/x-lzh-compressed" : @"lzh",
            @"application/x-lzx" : @"lzx",
            @"application/x-mac-binhex40" : @"hqx",
            @"application/x-macbinary" : @"bin",
            @"application/x-magic-cap-package-1.0" : @"mc$",
            @"application/x-mathcad" : @"mcd",
            @"application/x-meme" : @"mm",
            @"application/x-midi" : @"midi",
            @"application/x-mie" : @"mie",
            @"application/x-mif" : @"mif",
            @"application/x-mix-transfer" : @"nix",
            @"application/x-mobipocket-ebook" : @"prc",
            @"application/x-mplayer2" : @"asx",
            @"application/x-ms-application" : @"application",
            @"application/x-ms-shortcut" : @"lnk",
            @"application/x-ms-wmd" : @"wmd",
            @"application/x-ms-wmz" : @"wmz",
            @"application/x-ms-xbap" : @"xbap",
            @"application/x-msaccess" : @"mdb",
            @"application/x-msbinder" : @"obd",
            @"application/x-mscardfile" : @"crd",
            @"application/x-msclip" : @"clp",
            @"application/x-msdownload" : @"exe",
            @"application/x-msexcel" : @"xls",
            @"application/x-msmediaview" : @"mvb",
            @"application/x-msmetafile" : @"wmf",
            @"application/x-msmoney" : @"mny",
            @"application/x-mspowerpoint" : @"ppt",
            @"application/x-mspublisher" : @"pub",
            @"application/x-msschedule" : @"scd",
            @"application/x-msterminal" : @"trm",
            @"application/x-mswrite" : @"wri",
            @"application/x-navi-animation" : @"ani",
            @"application/x-navidoc" : @"nvd",
            @"application/x-navimap" : @"map",
            @"application/x-navistyle" : @"stl",
            @"application/x-netcdf" : @"nc",
            @"application/x-newton-compatible-pkg" : @"pkg",
            @"application/x-nokia-9000-communicator-add-on-software" : @"aos",
            @"application/x-nzb" : @"nzb",
            @"application/x-omc" : @"omc",
            @"application/x-omcdatamaker" : @"omcd",
            @"application/x-omcregerator" : @"omcr",
            @"application/x-pcl" : @"pcl",
            @"application/x-pixclscript" : @"plx",
            @"application/x-pkcs10" : @"p10",
            @"application/x-pkcs12" : @"p12",
            @"application/x-pkcs7-certificates" : @"p7b",
            @"application/x-pkcs7-certreqresp" : @"p7r",
            @"application/x-pkcs7-mime" : @"p7m",
            @"application/x-pkcs7-signature" : @"p7s",
            @"application/x-pointplus" : @"css",
            @"application/x-portable-anymap" : @"pnm",
            @"application/x-qpro" : @"wb1",
            @"application/x-rar-compressed" : @"rar",
            @"application/x-research-info-systems" : @"ris",
            @"application/x-rtf" : @"rtf",
            @"application/x-sdp" : @"sdp",
            @"application/x-sea" : @"sea",
            @"application/x-seelogo" : @"sl",
            @"application/x-sh" : @"sh",
            @"application/x-shar" : @"shar",
            @"application/x-shockwave-flash" : @"swf",
            @"application/x-silverlight-app" : @"xap",
            @"application/x-sit" : @"sit",
            @"application/x-sprite" : @"spr",
            @"application/x-sql" : @"sql",
            @"application/x-stuffit" : @"sit",
            @"application/x-stuffitx" : @"sitx",
            @"application/x-subrip" : @"srt",
            @"application/x-sv4cpio" : @"sv4cpio",
            @"application/x-sv4crc" : @"sv4crc",
            @"application/x-t3vm-image" : @"t3",
            @"application/x-tads" : @"gam",
            @"application/x-tar" : @"tar",
            @"application/x-tbook" : @"tbk",
            @"application/x-tcl" : @"tcl",
            @"application/x-tex" : @"tex",
            @"application/x-tex-tfm" : @"tfm",
            @"application/x-texinfo" : @"texinfo",
            @"application/x-tgif" : @"obj",
            @"application/x-troff-man" : @"man",
            @"application/x-troff-me" : @"me",
            @"application/x-troff-ms" : @"ms",
            @"application/x-troff-msvideo" : @"avi",
            @"application/x-ustar" : @"ustar",
            @"application/x-visio" : @"vsd",
            @"application/x-vnd.audioexplosion.mzz" : @"mzz",
            @"application/x-vnd.ls-xpix" : @"xpix",
            @"application/x-vrml" : @"vrml",
            @"application/x-wais-source" : @"src",
            @"application/x-winhelp" : @"hlp",
            @"application/x-wintalk" : @"wtk",
            @"application/x-wpwin" : @"wpd",
            @"application/x-wri" : @"wri",
            @"application/x-x509-ca-cert" : @"crt",
            @"application/x-x509-user-cert" : @"crt",
            @"application/x-xfig" : @"fig",
            @"application/x-xliff+xml" : @"xlf",
            @"application/x-xpinstall" : @"xpi",
            @"application/x-xz" : @"xz",
            @"application/x-zip-compressed" : @"zip",
            @"application/x-zmachine" : @"z1",
            @"application/xaml+xml" : @"xaml",
            @"application/xcap-diff+xml" : @"xdf",
            @"application/xenc+xml" : @"xenc",
            @"application/xhtml+xml" : @"xhtml",
            @"application/xml" : @"xml",
            @"application/xml-dtd" : @"dtd",
            @"application/xop+xml" : @"xop",
            @"application/xproc+xml" : @"xpl",
            @"application/xslt+xml" : @"xslt",
            @"application/xspf+xml" : @"xspf",
            @"application/xv+xml" : @"mxml",
            @"application/yang" : @"yang",
            @"application/yin+xml" : @"yin",
            @"application/ynd.ms-pkipko" : @"pko",
            OWSMimeTypeApplicationZip : @"zip",
            @"audio/aac" : @"aac",
            @"audio/adpcm" : @"adp",
            @"audio/aiff" : @"aiff",
            @"audio/basic" : @"au",
            @"audio/it" : @"it",
            @"audio/mid" : @"rmi",
            @"audio/midi" : @"midi",
            @"audio/mod" : @"mod",
            @"audio/mp4" : @"m4a",
            @"audio/mpeg" : @"mpg",
            @"audio/mpeg3" : @"mp3",
            @"audio/ogg" : @"oga",
            @"audio/s3m" : @"s3m",
            @"audio/silk" : @"sil",
            @"audio/tsp-audio" : @"tsi",
            @"audio/tsplayer" : @"tsp",
            @"audio/vnd.dece.audio" : @"uva",
            @"audio/vnd.digital-winds" : @"eol",
            @"audio/vnd.dra" : @"dra",
            @"audio/vnd.dts" : @"dts",
            @"audio/vnd.dts.hd" : @"dtshd",
            @"audio/vnd.lucent.voice" : @"lvp",
            @"audio/vnd.ms-playready.media.pya" : @"pya",
            @"audio/vnd.nuera.ecelp4800" : @"ecelp4800",
            @"audio/vnd.nuera.ecelp7470" : @"ecelp7470",
            @"audio/vnd.nuera.ecelp9600" : @"ecelp9600",
            @"audio/vnd.qcelp" : @"qcp",
            @"audio/vnd.rip" : @"rip",
            @"audio/voc" : @"voc",
            @"audio/voxware" : @"vox",
            @"audio/wav" : @"wav",
            @"audio/webm" : @"weba",
            @"audio/x-aac" : @"aac",
            @"audio/x-adpcm" : @"snd",
            @"audio/x-aiff" : @"aiff",
            @"audio/x-au" : @"au",
            @"audio/x-caf" : @"caf",
            @"audio/x-flac" : @"flac",
            @"audio/x-gsm" : @"gsm",
            @"audio/x-jam" : @"jam",
            @"audio/x-liveaudio" : @"lam",
            @"audio/x-matroska" : @"mka",
            @"audio/x-mid" : @"midi",
            @"audio/x-midi" : @"midi",
            @"audio/x-mod" : @"mod",
            @"audio/x-mpeg" : @"mp2",
            @"audio/x-mpeg-3" : @"mp3",
            @"audio/x-mpegurl" : @"m3u",
            @"audio/x-mpequrl" : @"m3u",
            @"audio/x-ms-wax" : @"wax",
            @"audio/x-ms-wma" : @"wma",
            @"audio/x-pn-realaudio" : @"ram",
            @"audio/x-pn-realaudio-plugin" : @"rmp",
            @"audio/x-psid" : @"sid",
            @"audio/x-realaudio" : @"ra",
            @"audio/x-twinvq" : @"vqf",
            @"audio/x-vnd.audioexplosion.mjuicemediafile" : @"mjf",
            @"audio/x-voc" : @"voc",
            @"audio/x-wav" : @"wav",
            @"audio/xm" : @"xm",
            @"chemical/x-cdx" : @"cdx",
            @"chemical/x-cif" : @"cif",
            @"chemical/x-cmdf" : @"cmdf",
            @"chemical/x-cml" : @"cml",
            @"chemical/x-csml" : @"csml",
            @"chemical/x-pdb" : @"pdb",
            @"chemical/x-xyz" : @"xyz",
            @"drawing/x-dwf" : @"dwf",
            @"font/ttf" : @"ttf",
            @"font/woff" : @"woff",
            @"font/woff2" : @"woff2",
            @"i-world/i-vrml" : @"ivr",
            @"image/bmp" : @"bmp",
            @"image/cgm" : @"cgm",
            @"image/cis-cod" : @"cod",
            @"image/fif" : @"fif",
            @"image/g3fax" : @"g3",
            @"image/gif" : @"gif",
            @"image/heic" : @"heic",
            @"image/heif" : @"heif",
            @"image/ief" : @"ief",
            @"image/jpeg" : @"jpg",
            @"image/jutvision" : @"jut",
            @"image/ktx" : @"ktx",
            @"image/pict" : @"pict",
            @"image/pjpeg" : @"jpg",
            @"image/png" : @"png",
            @"image/prs.btif" : @"btif",
            @"image/sgi" : @"sgi",
            @"image/svg+xml" : @"svg",
            @"image/tiff" : @"tiff",
            @"image/vasa" : @"mcf",
            @"image/vnd.adobe.photoshop" : @"psd",
            @"image/vnd.dece.graphic" : @"uvi",
            @"image/vnd.djvu" : @"djvu",
            @"image/vnd.dvb.subtitle" : @"sub",
            @"image/vnd.dwg" : @"dwg",
            @"image/vnd.dxf" : @"dxf",
            @"image/vnd.fastbidsheet" : @"fbs",
            @"image/vnd.fpx" : @"fpx",
            @"image/vnd.fst" : @"fst",
            @"image/vnd.fujixerox.edmics-mmr" : @"mmr",
            @"image/vnd.fujixerox.edmics-rlc" : @"rlc",
            @"image/vnd.ms-modi" : @"mdi",
            @"image/vnd.ms-photo" : @"wdp",
            @"image/vnd.net-fpx" : @"fpx",
            @"image/vnd.rn-realflash" : @"rf",
            @"image/vnd.rn-realpix" : @"rp",
            @"image/vnd.wap.wbmp" : @"wbmp",
            @"image/vnd.xiff" : @"xif",
            @"image/webp" : @"webp",
            @"image/x-3ds" : @"3ds",
            @"image/x-citrix-jpeg" : @"jpg",
            @"image/x-citrix-png" : @"png",
            @"image/x-cmu-raster" : @"ras",
            @"image/x-cmx" : @"cmx",
            @"image/x-dwg" : @"dwg",
            @"image/x-freehand" : @"fh",
            @"image/x-icon" : @"ico",
            @"image/x-jg" : @"art",
            @"image/x-jps" : @"jps",
            @"image/x-mrsid-image" : @"sid",
            @"image/x-niff" : @"niff",
            @"image/x-pcx" : @"pcx",
            @"image/x-pict" : @"pic",
            @"image/x-png" : @"png",
            @"image/x-portable-anymap" : @"pnm",
            @"image/x-portable-bitmap" : @"pbm",
            @"image/x-portable-graymap" : @"pgm",
            @"image/x-portable-greymap" : @"pgm",
            @"image/x-portable-pixmap" : @"ppm",
            @"image/x-rgb" : @"rgb",
            @"image/x-tga" : @"tga",
            @"image/x-tiff" : @"tiff",
            @"image/x-windows-bmp" : @"bmp",
            @"image/x-xbitmap" : @"xbm",
            @"image/x-xbm" : @"xbm",
            @"image/x-xpixmap" : @"xpm",
            @"image/x-xwd" : @"xwd",
            @"image/x-xwindowdump" : @"xwd",
            @"image/xbm" : @"xbm",
            @"image/xpm" : @"xpm",
            @"message/rfc822" : @"eml",
            @"model/iges" : @"iges",
            @"model/mesh" : @"msh",
            @"model/vnd.collada+xml" : @"dae",
            @"model/vnd.dwf" : @"dwf",
            @"model/vnd.gdl" : @"gdl",
            @"model/vnd.gtw" : @"gtw",
            @"model/vnd.mts" : @"mts",
            @"model/vnd.vtu" : @"vtu",
            @"model/vrml" : @"vrml",
            @"model/x-pov" : @"pov",
            @"model/x3d+binary" : @"x3db",
            @"model/x3d+vrml" : @"x3dv",
            @"model/x3d+xml" : @"x3d",
            @"multipart/x-gzip" : @"gzip",
            @"multipart/x-ustar" : @"ustar",
            @"multipart/x-zip" : @"zip",
            @"music/x-karaoke" : @"kar",
            @"paleovu/x-pv" : @"pvu",
            @"text/asp" : @"asp",
            @"text/cache-manifest" : @"appcache",
            @"text/calendar" : @"ics",
            @"text/css" : @"css",
            @"text/csv" : @"csv",
            @"text/ecmascript" : @"js",
            @"text/h323" : @"323",
            @"text/html" : @"html",
            @"text/iuls" : @"uls",
            @"text/java" : @"java",
            @"text/javascript" : @"js",
            @"text/mcf" : @"mcf",
            @"text/n3" : @"n3",
            @"text/pascal" : @"pas",
            @"text/plain" : @"txt",
            @"text/plain-bas" : @"par",
            @"text/prs.lines.logTag" : @"dsc",
            @"text/richtext" : @"rtf",
            @"text/scriplet" : @"wsc",
            @"text/scriptlet" : @"sct",
            @"text/sgml" : @"sgml",
            @"text/tab-separated-values" : @"tsv",
            @"text/troff" : @"t",
            @"text/turtle" : @"ttl",
            @"text/uri-list" : @"uri",
            @"text/vcard" : @"vcard",
            @"text/vnd.abc" : @"abc",
            @"text/vnd.curl" : @"curl",
            @"text/vnd.curl.dcurl" : @"dcurl",
            @"text/vnd.curl.mcurl" : @"mcurl",
            @"text/vnd.curl.scurl" : @"scurl",
            @"text/vnd.dvb.subtitle" : @"sub",
            @"text/vnd.fly" : @"fly",
            @"text/vnd.fmi.flexstor" : @"flx",
            @"text/vnd.graphviz" : @"gv",
            @"text/vnd.in3d.3dml" : @"3dml",
            @"text/vnd.in3d.spot" : @"spot",
            @"text/vnd.rn-realtext" : @"rt",
            @"text/vnd.sun.j2me.app-descriptor" : @"jad",
            @"text/vnd.wap.wml" : @"wml",
            @"text/vnd.wap.wmlscript" : @"wmls",
            @"text/webviewhtml" : @"htt",
            @"text/x-asm" : @"asm",
            @"text/x-audiosoft-intra" : @"aip",
            @"text/x-c" : @"c",
            @"text/x-component" : @"htc",
            @"text/x-fortran" : @"f",
            @"text/x-h" : @"h",
            @"text/x-java-source" : @"java",
            @"text/x-la-asf" : @"lsx",
            @"text/x-m" : @"m",
            @"text/x-nfo" : @"nfo",
            @"text/x-opml" : @"opml",
            @"text/x-pascal" : @"p",
            @"text/x-script" : @"hlb",
            @"text/x-script.csh" : @"csh",
            @"text/x-script.elisp" : @"el",
            @"text/x-script.guile" : @"scm",
            @"text/x-script.ksh" : @"ksh",
            @"text/x-script.lisp" : @"lsp",
            @"text/x-script.perl" : @"pl",
            @"text/x-script.perl-module" : @"pm",
            @"text/x-script.phyton" : @"py",
            @"text/x-script.rexx" : @"rexx",
            @"text/x-script.scheme" : @"scm",
            @"text/x-script.sh" : @"sh",
            @"text/x-script.tcl" : @"tcl",
            @"text/x-script.tcsh" : @"tcsh",
            @"text/x-script.zsh" : @"zsh",
            @"text/x-setext" : @"etx",
            @"text/x-sfv" : @"sfv",
            @"text/x-sgml" : @"sgml",
            @"text/x-uil" : @"uil",
            @"text/x-uuencode" : @"uu",
            @"text/x-vcalendar" : @"vcs",
            @"text/x-vcard" : @"vcf",
            @"text/xml" : @"xml",
            @"text/yaml" : @"yaml",
            @"video/3gpp" : @"3gp",
            @"video/3gpp2" : @"3g2",
            @"video/animaflex" : @"afl",
            @"video/avi" : @"avi",
            @"video/avs-video" : @"avs",
            @"video/dl" : @"dl",
            @"video/fli" : @"fli",
            @"video/gl" : @"gl",
            @"video/h261" : @"h261",
            @"video/h263" : @"h263",
            @"video/h264" : @"h264",
            @"video/jpeg" : @"jpgv",
            @"video/jpm" : @"jpm",
            @"video/mj2" : @"mj2",
            @"video/mp4" : @"mp4",
            @"video/mpeg" : @"mpg",
            @"video/msvideo" : @"avi",
            @"video/ogg" : @"ogv",
            @"video/quicktime" : @"mov",
            @"video/vdo" : @"vdo",
            @"video/vnd.dece.hd" : @"uvh",
            @"video/vnd.dece.mobile" : @"uvm",
            @"video/vnd.dece.pd" : @"uvp",
            @"video/vnd.dece.sd" : @"uvs",
            @"video/vnd.dece.video" : @"uvv",
            @"video/vnd.dvb.file" : @"dvb",
            @"video/vnd.fvt" : @"fvt",
            @"video/vnd.mpegurl" : @"mxu",
            @"video/vnd.ms-playready.media.pyv" : @"pyv",
            @"video/vnd.rn-realvideo" : @"rv",
            @"video/vnd.uvvu.mp4" : @"uvu",
            @"video/vnd.vivo" : @"viv",
            @"video/vosaic" : @"vos",
            @"video/webm" : @"webm",
            @"video/x-amt-demorun" : @"xdr",
            @"video/x-amt-showrun" : @"xsr",
            @"video/x-atomic3d-feature" : @"fmf",
            @"video/x-dl" : @"dl",
            @"video/x-dv" : @"dv",
            @"video/x-f4v" : @"f4v",
            @"video/x-fli" : @"fli",
            @"video/x-flv" : @"flv",
            @"video/x-gl" : @"gl",
            @"video/x-isvideo" : @"isu",
            @"video/x-la-asf" : @"lsf",
            @"video/x-m4v" : @"m4v",
            @"video/x-matroska" : @"mkv",
            @"video/x-mng" : @"mng",
            @"video/x-motion-jpeg" : @"mjpg",
            @"video/x-mpeg" : @"mpg",
            @"video/x-mpeq2a" : @"mp2",
            @"video/x-ms-asf" : @"asf",
            @"video/x-ms-asf-plugin" : @"asx",
            @"video/x-ms-vob" : @"vob",
            @"video/x-ms-wm" : @"wm",
            @"video/x-ms-wmv" : @"wmv",
            @"video/x-ms-wmx" : @"wmx",
            @"video/x-ms-wvx" : @"wvx",
            @"video/x-msvideo" : @"avi",
            @"video/x-qtc" : @"qtc",
            @"video/x-scm" : @"scm",
            @"video/x-sgi-movie" : @"movie",
            @"video/x-smv" : @"smv",
            @"windows/metafile" : @"wmf",
            @"www/mime" : @"mime",
            @"x-conference/x-cooltalk" : @"ice",
            @"x-music/x-midi" : @"midi",
            @"x-world/x-3dmf" : @"3dmf",
            @"x-world/x-svr" : @"svr",
            @"x-world/x-vrml" : @"vrml",
            @"x-world/x-vrt" : @"vrt",
            @"xgl/drawing" : @"xgz",
            @"xgl/movie" : @"xmz",
        };
    });
    return result;
}

+ (nullable NSString *)mimeTypeForFileExtension:(NSString *)fileExtension
{
    return [self genericExtensionTypesToMIMETypes][fileExtension];
}

+ (NSDictionary *)genericExtensionTypesToMIMETypes
{
    static NSDictionary *result = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        result = @{
            @"123" : @"application/vnd.lotus-1-2-3",
            @"3dml" : @"text/vnd.in3d.3dml",
            @"3ds" : @"image/x-3ds",
            @"3g2" : @"video/3gpp2",
            @"3gp" : @"video/3gpp",
            @"7z" : @"application/x-7z-compressed",
            @"aab" : @"application/x-authorware-bin",
            @"aac" : @"audio/x-aac",
            @"aam" : @"application/x-authorware-map",
            @"aas" : @"application/x-authorware-seg",
            @"abw" : @"application/x-abiword",
            @"ac" : @"application/pkix-attr-cert",
            @"acc" : @"application/vnd.americandynamics.acc",
            @"ace" : @"application/x-ace-compressed",
            @"acu" : @"application/vnd.acucobol",
            @"acutc" : @"application/vnd.acucorp",
            @"adp" : @"audio/adpcm",
            @"aep" : @"application/vnd.audiograph",
            @"afm" : @"application/x-font-type1",
            @"afp" : @"application/vnd.ibm.modcap",
            @"ahead" : @"application/vnd.ahead.space",
            @"ai" : @"application/postscript",
            @"aif" : @"audio/x-aiff",
            @"aifc" : @"audio/x-aiff",
            @"aiff" : @"audio/x-aiff",
            @"air" : @"application/vnd.adobe.air-application-installer-package+zip",
            @"ait" : @"application/vnd.dvb.ait",
            @"ami" : @"application/vnd.amiga.ami",
            @"apk" : @"application/vnd.android.package-archive",
            @"appcache" : @"text/cache-manifest",
            @"application" : @"application/x-ms-application",
            @"apr" : @"application/vnd.lotus-approach",
            @"arc" : @"application/x-freearc",
            @"asc" : @"application/pgp-signature",
            @"asf" : @"video/x-ms-asf",
            @"asm" : @"text/x-asm",
            @"aso" : @"application/vnd.accpac.simply.aso",
            @"asx" : @"video/x-ms-asf",
            @"atc" : @"application/vnd.acucorp",
            @"atom" : @"application/atom+xml",
            @"atomcat" : @"application/atomcat+xml",
            @"atomsvc" : @"application/atomsvc+xml",
            @"atx" : @"application/vnd.antix.game-component",
            @"au" : @"audio/basic",
            @"avi" : @"video/x-msvideo",
            @"aw" : @"application/applixware",
            @"azf" : @"application/vnd.airzip.filesecure.azf",
            @"azs" : @"application/vnd.airzip.filesecure.azs",
            @"azw" : @"application/vnd.amazon.ebook",
            @"bat" : @"application/x-msdownload",
            @"bcpio" : @"application/x-bcpio",
            @"bdf" : @"application/x-font-bdf",
            @"bdm" : @"application/vnd.syncml.dm+wbxml",
            @"bed" : @"application/vnd.realvnc.bed",
            @"bh2" : @"application/vnd.fujitsu.oasysprs",
            @"bin" : @"application/octet-stream",
            @"blb" : @"application/x-blorb",
            @"blorb" : @"application/x-blorb",
            @"bmi" : @"application/vnd.bmi",
            @"bmp" : @"image/bmp",
            @"book" : @"application/vnd.framemaker",
            @"box" : @"application/vnd.previewsystems.box",
            @"boz" : @"application/x-bzip2",
            @"bpk" : @"application/octet-stream",
            @"btif" : @"image/prs.btif",
            @"bz" : @"application/x-bzip",
            @"bz2" : @"application/x-bzip2",
            @"c" : @"text/x-c",
            @"c11amc" : @"application/vnd.cluetrust.cartomobile-config",
            @"c11amz" : @"application/vnd.cluetrust.cartomobile-config-pkg",
            @"c4d" : @"application/vnd.clonk.c4group",
            @"c4f" : @"application/vnd.clonk.c4group",
            @"c4g" : @"application/vnd.clonk.c4group",
            @"c4p" : @"application/vnd.clonk.c4group",
            @"c4u" : @"application/vnd.clonk.c4group",
            @"cab" : @"application/vnd.ms-cab-compressed",
            @"caf" : @"audio/x-caf",
            @"cap" : @"application/vnd.tcpdump.pcap",
            @"car" : @"application/vnd.curl.car",
            @"cat" : @"application/vnd.ms-pki.seccat",
            @"cb7" : @"application/x-cbr",
            @"cba" : @"application/x-cbr",
            @"cbr" : @"application/x-cbr",
            @"cbt" : @"application/x-cbr",
            @"cbz" : @"application/x-cbr",
            @"cc" : @"text/x-c",
            @"cct" : @"application/x-director",
            @"ccxml" : @"application/ccxml+xml",
            @"cdbcmsg" : @"application/vnd.contact.cmsg",
            @"cdf" : @"application/x-netcdf",
            @"cdkey" : @"application/vnd.mediastation.cdkey",
            @"cdmia" : @"application/cdmi-capability",
            @"cdmic" : @"application/cdmi-container",
            @"cdmid" : @"application/cdmi-domain",
            @"cdmio" : @"application/cdmi-object",
            @"cdmiq" : @"application/cdmi-queue",
            @"cdx" : @"chemical/x-cdx",
            @"cdxml" : @"application/vnd.chemdraw+xml",
            @"cdy" : @"application/vnd.cinderella",
            @"cer" : @"application/pkix-cert",
            @"cfs" : @"application/x-cfs-compressed",
            @"cgm" : @"image/cgm",
            @"chat" : @"application/x-chat",
            @"chm" : @"application/vnd.ms-htmlhelp",
            @"chrt" : @"application/vnd.kde.kchart",
            @"cif" : @"chemical/x-cif",
            @"cii" : @"application/vnd.anser-web-certificate-issue-initiation",
            @"cil" : @"application/vnd.ms-artgalry",
            @"cla" : @"application/vnd.claymore",
            @"class" : @"application/java-vm",
            @"clkk" : @"application/vnd.crick.clicker.keyboard",
            @"clkp" : @"application/vnd.crick.clicker.palette",
            @"clkt" : @"application/vnd.crick.clicker.template",
            @"clkw" : @"application/vnd.crick.clicker.wordbank",
            @"clkx" : @"application/vnd.crick.clicker",
            @"clp" : @"application/x-msclip",
            @"cmc" : @"application/vnd.cosmocaller",
            @"cmdf" : @"chemical/x-cmdf",
            @"cml" : @"chemical/x-cml",
            @"cmp" : @"application/vnd.yellowriver-custom-menu",
            @"cmx" : @"image/x-cmx",
            @"cod" : @"application/vnd.rim.cod",
            @"com" : @"application/x-msdownload",
            @"conf" : @"text/plain",
            @"cpio" : @"application/x-cpio",
            @"cpp" : @"text/x-c",
            @"cpt" : @"application/mac-compactpro",
            @"crd" : @"application/x-mscardfile",
            @"crl" : @"application/pkix-crl",
            @"crt" : @"application/x-x509-ca-cert",
            @"cryptonote" : @"application/vnd.rig.cryptonote",
            @"csh" : @"application/x-csh",
            @"csml" : @"chemical/x-csml",
            @"csp" : @"application/vnd.commonspace",
            @"css" : @"text/css",
            @"cst" : @"application/x-director",
            @"csv" : @"text/csv",
            @"cu" : @"application/cu-seeme",
            @"curl" : @"text/vnd.curl",
            @"cww" : @"application/prs.cww",
            @"cxt" : @"application/x-director",
            @"cxx" : @"text/x-c",
            @"dae" : @"model/vnd.collada+xml",
            @"daf" : @"application/vnd.mobius.daf",
            @"dart" : @"application/vnd.dart",
            @"dataless" : @"application/vnd.fdsn.seed",
            @"davmount" : @"application/davmount+xml",
            @"dbk" : @"application/docbook+xml",
            @"dcr" : @"application/x-director",
            @"dcurl" : @"text/vnd.curl.dcurl",
            @"dd2" : @"application/vnd.oma.dd2+xml",
            @"ddd" : @"application/vnd.fujixerox.ddd",
            @"deb" : @"application/x-debian-package",
            @"def" : @"text/plain",
            @"deploy" : @"application/octet-stream",
            @"der" : @"application/x-x509-ca-cert",
            @"dfac" : @"application/vnd.dreamfactory",
            @"dgc" : @"application/x-dgc-compressed",
            @"dic" : @"text/x-c",
            @"dir" : @"application/x-director",
            @"dis" : @"application/vnd.mobius.dis",
            @"dist" : @"application/octet-stream",
            @"distz" : @"application/octet-stream",
            @"djv" : @"image/vnd.djvu",
            @"djvu" : @"image/vnd.djvu",
            @"dll" : @"application/x-msdownload",
            @"dmg" : @"application/x-apple-diskimage",
            @"dmp" : @"application/vnd.tcpdump.pcap",
            @"dms" : @"application/octet-stream",
            @"dna" : @"application/vnd.dna",
            @"doc" : @"application/msword",
            @"docm" : @"application/vnd.ms-word.document.macroenabled.12",
            @"docx" : @"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            @"dot" : @"application/msword",
            @"dotm" : @"application/vnd.ms-word.template.macroenabled.12",
            @"dotx" : @"application/vnd.openxmlformats-officedocument.wordprocessingml.template",
            @"dp" : @"application/vnd.osgi.dp",
            @"dpg" : @"application/vnd.dpgraph",
            @"dra" : @"audio/vnd.dra",
            @"dsc" : @"text/prs.lines.logTag",
            @"dssc" : @"application/dssc+der",
            @"dtb" : @"application/x-dtbook+xml",
            @"dtd" : @"application/xml-dtd",
            @"dts" : @"audio/vnd.dts",
            @"dtshd" : @"audio/vnd.dts.hd",
            @"dump" : @"application/octet-stream",
            @"dvb" : @"video/vnd.dvb.file",
            @"dvi" : @"application/x-dvi",
            @"dwf" : @"model/vnd.dwf",
            @"dwg" : @"image/vnd.dwg",
            @"dxf" : @"image/vnd.dxf",
            @"dxp" : @"application/vnd.spotfire.dxp",
            @"dxr" : @"application/x-director",
            @"ecelp4800" : @"audio/vnd.nuera.ecelp4800",
            @"ecelp7470" : @"audio/vnd.nuera.ecelp7470",
            @"ecelp9600" : @"audio/vnd.nuera.ecelp9600",
            @"ecma" : @"application/ecmascript",
            @"edm" : @"application/vnd.novadigm.edm",
            @"edx" : @"application/vnd.novadigm.edx",
            @"efif" : @"application/vnd.picsel",
            @"ei6" : @"application/vnd.pg.osasli",
            @"elc" : @"application/octet-stream",
            @"emf" : @"application/x-msmetafile",
            @"eml" : @"message/rfc822",
            @"emma" : @"application/emma+xml",
            @"emz" : @"application/x-msmetafile",
            @"eol" : @"audio/vnd.digital-winds",
            @"eot" : @"application/vnd.ms-fontobject",
            @"eps" : @"application/postscript",
            @"epub" : @"application/epub+zip",
            @"es3" : @"application/vnd.eszigno3+xml",
            @"esa" : @"application/vnd.osgi.subsystem",
            @"esf" : @"application/vnd.epson.esf",
            @"et3" : @"application/vnd.eszigno3+xml",
            @"etx" : @"text/x-setext",
            @"eva" : @"application/x-eva",
            @"evy" : @"application/x-envoy",
            @"exe" : @"application/x-msdownload",
            @"exi" : @"application/exi",
            @"ext" : @"application/vnd.novadigm.ext",
            @"ez" : @"application/andrew-inset",
            @"ez2" : @"application/vnd.ezpix-album",
            @"ez3" : @"application/vnd.ezpix-package",
            @"f" : @"text/x-fortran",
            @"f4v" : @"video/x-f4v",
            @"f77" : @"text/x-fortran",
            @"f90" : @"text/x-fortran",
            @"fbs" : @"image/vnd.fastbidsheet",
            @"fcdt" : @"application/vnd.adobe.formscentral.fcdt",
            @"fcs" : @"application/vnd.isac.fcs",
            @"fdf" : @"application/vnd.fdf",
            @"fe_launch" : @"application/vnd.denovo.fcselayout-link",
            @"fg5" : @"application/vnd.fujitsu.oasysgp",
            @"fgd" : @"application/x-director",
            @"fh" : @"image/x-freehand",
            @"fh4" : @"image/x-freehand",
            @"fh5" : @"image/x-freehand",
            @"fh7" : @"image/x-freehand",
            @"fhc" : @"image/x-freehand",
            @"fig" : @"application/x-xfig",
            @"flac" : @"audio/x-flac",
            @"fli" : @"video/x-fli",
            @"flo" : @"application/vnd.micrografx.flo",
            @"flv" : @"video/x-flv",
            @"flw" : @"application/vnd.kde.kivio",
            @"flx" : @"text/vnd.fmi.flexstor",
            @"fly" : @"text/vnd.fly",
            @"fm" : @"application/vnd.framemaker",
            @"fnc" : @"application/vnd.frogans.fnc",
            @"for" : @"text/x-fortran",
            @"fpx" : @"image/vnd.fpx",
            @"frame" : @"application/vnd.framemaker",
            @"fsc" : @"application/vnd.fsc.weblaunch",
            @"fst" : @"image/vnd.fst",
            @"ftc" : @"application/vnd.fluxtime.clip",
            @"fti" : @"application/vnd.anser-web-funds-transfer-initiation",
            @"fvt" : @"video/vnd.fvt",
            @"fxp" : @"application/vnd.adobe.fxp",
            @"fxpl" : @"application/vnd.adobe.fxp",
            @"fzs" : @"application/vnd.fuzzysheet",
            @"g2w" : @"application/vnd.geoplan",
            @"g3" : @"image/g3fax",
            @"g3w" : @"application/vnd.geospace",
            @"gac" : @"application/vnd.groove-account",
            @"gam" : @"application/x-tads",
            @"gbr" : @"application/rpki-ghostbusters",
            @"gca" : @"application/x-gca-compressed",
            @"gdl" : @"model/vnd.gdl",
            @"geo" : @"application/vnd.dynageo",
            @"gex" : @"application/vnd.geometry-explorer",
            @"ggb" : @"application/vnd.geogebra.file",
            @"ggt" : @"application/vnd.geogebra.tool",
            @"ghf" : @"application/vnd.groove-help",
            @"gif" : @"image/gif",
            @"gim" : @"application/vnd.groove-identity-message",
            @"gml" : @"application/gml+xml",
            @"gmx" : @"application/vnd.gmx",
            @"gnumeric" : @"application/x-gnumeric",
            @"gph" : @"application/vnd.flographit",
            @"gpx" : @"application/gpx+xml",
            @"gqf" : @"application/vnd.grafeq",
            @"gqs" : @"application/vnd.grafeq",
            @"gram" : @"application/srgs",
            @"gramps" : @"application/x-gramps-xml",
            @"gre" : @"application/vnd.geometry-explorer",
            @"grv" : @"application/vnd.groove-injector",
            @"grxml" : @"application/srgs+xml",
            @"gsf" : @"application/x-font-ghostscript",
            @"gtar" : @"application/x-gtar",
            @"gtm" : @"application/vnd.groove-tool-message",
            @"gtw" : @"model/vnd.gtw",
            @"gv" : @"text/vnd.graphviz",
            @"gxf" : @"application/gxf",
            @"gxt" : @"application/vnd.geonext",
            @"h" : @"text/x-c",
            @"h261" : @"video/h261",
            @"h263" : @"video/h263",
            @"h264" : @"video/h264",
            @"hal" : @"application/vnd.hal+xml",
            @"hbci" : @"application/vnd.hbci",
            @"hdf" : @"application/x-hdf",
            @"heic" : @"image/heic",
            @"heif" : @"image/heif",
            @"hh" : @"text/x-c",
            @"hlp" : @"application/winhlp",
            @"hpgl" : @"application/vnd.hp-hpgl",
            @"hpid" : @"application/vnd.hp-hpid",
            @"hps" : @"application/vnd.hp-hps",
            @"hqx" : @"application/mac-binhex40",
            @"htke" : @"application/vnd.kenameaapp",
            @"htm" : @"text/html",
            @"html" : @"text/html",
            @"hvd" : @"application/vnd.yamaha.hv-dic",
            @"hvp" : @"application/vnd.yamaha.hv-voice",
            @"hvs" : @"application/vnd.yamaha.hv-script",
            @"i2g" : @"application/vnd.intergeo",
            @"icc" : @"application/vnd.iccprofile",
            @"ice" : @"x-conference/x-cooltalk",
            @"icm" : @"application/vnd.iccprofile",
            @"ico" : @"image/x-icon",
            @"ics" : @"text/calendar",
            @"ief" : @"image/ief",
            @"ifb" : @"text/calendar",
            @"ifm" : @"application/vnd.shana.informed.formdata",
            @"iges" : @"model/iges",
            @"igl" : @"application/vnd.igloader",
            @"igm" : @"application/vnd.insors.igm",
            @"igs" : @"model/iges",
            @"igx" : @"application/vnd.micrografx.igx",
            @"iif" : @"application/vnd.shana.informed.interchange",
            @"imp" : @"application/vnd.accpac.simply.imp",
            @"ims" : @"application/vnd.ms-ims",
            @"in" : @"text/plain",
            @"ink" : @"application/inkml+xml",
            @"inkml" : @"application/inkml+xml",
            @"install" : @"application/x-install-instructions",
            @"iota" : @"application/vnd.astraea-software.iota",
            @"ipfix" : @"application/ipfix",
            @"ipk" : @"application/vnd.shana.informed.package",
            @"irm" : @"application/vnd.ibm.rights-management",
            @"irp" : @"application/vnd.irepository.package+xml",
            @"iso" : @"application/x-iso9660-image",
            @"itp" : @"application/vnd.shana.informed.formtemplate",
            @"ivp" : @"application/vnd.immervision-ivp",
            @"ivu" : @"application/vnd.immervision-ivu",
            @"jad" : @"text/vnd.sun.j2me.app-descriptor",
            @"jam" : @"application/vnd.jam",
            @"jar" : @"application/java-archive",
            @"java" : @"text/x-java-source",
            @"jisp" : @"application/vnd.jisp",
            @"jlt" : @"application/vnd.hp-jlyt",
            @"jnlp" : @"application/x-java-jnlp-file",
            @"joda" : @"application/vnd.joost.joda-archive",
            @"jpe" : @"image/jpeg",
            @"jpeg" : @"image/jpeg",
            @"jpg" : @"image/jpeg",
            @"jpgm" : @"video/jpm",
            @"jpgv" : @"video/jpeg",
            @"jpm" : @"video/jpm",
            @"js" : @"application/javascript",
            @"json" : @"application/json",
            @"jsonml" : @"application/jsonml+json",
            @"kar" : @"audio/midi",
            @"karbon" : @"application/vnd.kde.karbon",
            @"kfo" : @"application/vnd.kde.kformula",
            @"kia" : @"application/vnd.kidspiration",
            @"kml" : @"application/vnd.google-earth.kml+xml",
            @"kmz" : @"application/vnd.google-earth.kmz",
            @"kne" : @"application/vnd.kinar",
            @"knp" : @"application/vnd.kinar",
            @"kon" : @"application/vnd.kde.kontour",
            @"kpr" : @"application/vnd.kde.kpresenter",
            @"kpt" : @"application/vnd.kde.kpresenter",
            @"kpxx" : @"application/vnd.ds-keypoint",
            @"ksp" : @"application/vnd.kde.kspread",
            @"ktr" : @"application/vnd.kahootz",
            @"ktx" : @"image/ktx",
            @"ktz" : @"application/vnd.kahootz",
            @"kwd" : @"application/vnd.kde.kword",
            @"kwt" : @"application/vnd.kde.kword",
            @"lasxml" : @"application/vnd.las.las+xml",
            @"latex" : @"application/x-latex",
            @"lbd" : @"application/vnd.llamagraphics.life-balance.desktop",
            @"lbe" : @"application/vnd.llamagraphics.life-balance.exchange+xml",
            @"les" : @"application/vnd.hhe.lesson-player",
            @"lha" : @"application/x-lzh-compressed",
            @"link66" : @"application/vnd.route66.link66+xml",
            @"list" : @"text/plain",
            @"list3820" : @"application/vnd.ibm.modcap",
            @"listafp" : @"application/vnd.ibm.modcap",
            @"lnk" : @"application/x-ms-shortcut",
            @"log" : @"text/plain",
            @"lostxml" : @"application/lost+xml",
            @"lrf" : @"application/octet-stream",
            @"lrm" : @"application/vnd.ms-lrm",
            @"ltf" : @"application/vnd.frogans.ltf",
            @"lvp" : @"audio/vnd.lucent.voice",
            @"lwp" : @"application/vnd.lotus-wordpro",
            @"lzh" : @"application/x-lzh-compressed",
            @"m13" : @"application/x-msmediaview",
            @"m14" : @"application/x-msmediaview",
            @"m1v" : @"video/mpeg",
            @"m21" : @"application/mp21",
            @"m2a" : @"audio/mpeg",
            @"m2v" : @"video/mpeg",
            @"m3a" : @"audio/mpeg",
            @"m3u" : @"audio/x-mpegurl",
            @"m3u8" : @"application/vnd.apple.mpegurl",
            @"m4a" : @"audio/mp4",
            @"m4u" : @"video/vnd.mpegurl",
            @"m4v" : @"video/x-m4v",
            @"ma" : @"application/mathematica",
            @"mads" : @"application/mads+xml",
            @"mag" : @"application/vnd.ecowin.chart",
            @"maker" : @"application/vnd.framemaker",
            @"man" : @"text/troff",
            @"mar" : @"application/octet-stream",
            @"mathml" : @"application/mathml+xml",
            @"mb" : @"application/mathematica",
            @"mbk" : @"application/vnd.mobius.mbk",
            @"mbox" : @"application/mbox",
            @"mc1" : @"application/vnd.medcalcdata",
            @"mcd" : @"application/vnd.mcd",
            @"mcurl" : @"text/vnd.curl.mcurl",
            @"mdb" : @"application/x-msaccess",
            @"mdi" : @"image/vnd.ms-modi",
            @"me" : @"text/troff",
            @"mesh" : @"model/mesh",
            @"meta4" : @"application/metalink4+xml",
            @"metalink" : @"application/metalink+xml",
            @"mets" : @"application/mets+xml",
            @"mfm" : @"application/vnd.mfmp",
            @"mft" : @"application/rpki-manifest",
            @"mgp" : @"application/vnd.osgeo.mapguide.package",
            @"mgz" : @"application/vnd.proteus.magazine",
            @"mid" : @"audio/midi",
            @"midi" : @"audio/midi",
            @"mie" : @"application/x-mie",
            @"mif" : @"application/vnd.mif",
            @"mime" : @"message/rfc822",
            @"mj2" : @"video/mj2",
            @"mjp2" : @"video/mj2",
            @"mk3d" : @"video/x-matroska",
            @"mka" : @"audio/x-matroska",
            @"mks" : @"video/x-matroska",
            @"mkv" : @"video/x-matroska",
            @"mlp" : @"application/vnd.dolby.mlp",
            @"mmd" : @"application/vnd.chipnuts.karaoke-mmd",
            @"mmf" : @"application/vnd.smaf",
            @"mmr" : @"image/vnd.fujixerox.edmics-mmr",
            @"mng" : @"video/x-mng",
            @"mny" : @"application/x-msmoney",
            @"mobi" : @"application/x-mobipocket-ebook",
            @"mods" : @"application/mods+xml",
            @"mov" : @"video/quicktime",
            @"movie" : @"video/x-sgi-movie",
            @"mp2" : @"audio/mpeg",
            @"mp21" : @"application/mp21",
            @"mp2a" : @"audio/mpeg",
            @"mp3" : @"audio/mpeg",
            @"mp4" : @"video/mp4",
            @"mp4a" : @"audio/mp4",
            @"mp4s" : @"application/mp4",
            @"mp4v" : @"video/mp4",
            @"mpc" : @"application/vnd.mophun.certificate",
            @"mpe" : @"video/mpeg",
            @"mpeg" : @"video/mpeg",
            @"mpg" : @"video/mpeg",
            @"mpg4" : @"video/mp4",
            @"mpga" : @"audio/mpeg",
            @"mpkg" : @"application/vnd.apple.installer+xml",
            @"mpm" : @"application/vnd.blueice.multipass",
            @"mpn" : @"application/vnd.mophun.application",
            @"mpp" : @"application/vnd.ms-project",
            @"mpt" : @"application/vnd.ms-project",
            @"mpy" : @"application/vnd.ibm.minipay",
            @"mqy" : @"application/vnd.mobius.mqy",
            @"mrc" : @"application/marc",
            @"mrcx" : @"application/marcxml+xml",
            @"ms" : @"text/troff",
            @"mscml" : @"application/mediaservercontrol+xml",
            @"mseed" : @"application/vnd.fdsn.mseed",
            @"mseq" : @"application/vnd.mseq",
            @"msf" : @"application/vnd.epson.msf",
            @"msh" : @"model/mesh",
            @"msi" : @"application/x-msdownload",
            @"msl" : @"application/vnd.mobius.msl",
            @"msty" : @"application/vnd.muvee.style",
            @"mts" : @"model/vnd.mts",
            @"mus" : @"application/vnd.musician",
            @"musicxml" : @"application/vnd.recordare.musicxml+xml",
            @"mvb" : @"application/x-msmediaview",
            @"mwf" : @"application/vnd.mfer",
            @"mxf" : @"application/mxf",
            @"mxl" : @"application/vnd.recordare.musicxml",
            @"mxml" : @"application/xv+xml",
            @"mxs" : @"application/vnd.triscape.mxs",
            @"mxu" : @"video/vnd.mpegurl",
            @"n-gage" : @"application/vnd.nokia.n-gage.symbian.install",
            @"n3" : @"text/n3",
            @"nb" : @"application/mathematica",
            @"nbp" : @"application/vnd.wolfram.player",
            @"nc" : @"application/x-netcdf",
            @"ncx" : @"application/x-dtbncx+xml",
            @"nfo" : @"text/x-nfo",
            @"ngdat" : @"application/vnd.nokia.n-gage.data",
            @"nitf" : @"application/vnd.nitf",
            @"nlu" : @"application/vnd.neurolanguage.nlu",
            @"nml" : @"application/vnd.enliven",
            @"nnd" : @"application/vnd.noblenet-directory",
            @"nns" : @"application/vnd.noblenet-sealer",
            @"nnw" : @"application/vnd.noblenet-web",
            @"npx" : @"image/vnd.net-fpx",
            @"nsc" : @"application/x-conference",
            @"nsf" : @"application/vnd.lotus-notes",
            @"ntf" : @"application/vnd.nitf",
            @"nzb" : @"application/x-nzb",
            @"oa2" : @"application/vnd.fujitsu.oasys2",
            @"oa3" : @"application/vnd.fujitsu.oasys3",
            @"oas" : @"application/vnd.fujitsu.oasys",
            @"obd" : @"application/x-msbinder",
            @"obj" : @"application/x-tgif",
            @"oda" : @"application/oda",
            @"odb" : @"application/vnd.oasis.opendocument.database",
            @"odc" : @"application/vnd.oasis.opendocument.chart",
            @"odf" : @"application/vnd.oasis.opendocument.formula",
            @"odft" : @"application/vnd.oasis.opendocument.formula-template",
            @"odg" : @"application/vnd.oasis.opendocument.graphics",
            @"odi" : @"application/vnd.oasis.opendocument.image",
            @"odm" : @"application/vnd.oasis.opendocument.text-master",
            @"odp" : @"application/vnd.oasis.opendocument.presentation",
            @"ods" : @"application/vnd.oasis.opendocument.spreadsheet",
            @"odt" : @"application/vnd.oasis.opendocument.text",
            @"oga" : @"audio/ogg",
            @"ogg" : @"audio/ogg",
            @"ogv" : @"video/ogg",
            @"ogx" : @"application/ogg",
            @"omdoc" : @"application/omdoc+xml",
            @"onepkg" : @"application/onenote",
            @"onetmp" : @"application/onenote",
            @"onetoc" : @"application/onenote",
            @"onetoc2" : @"application/onenote",
            @"opf" : @"application/oebps-package+xml",
            @"opml" : @"text/x-opml",
            @"oprc" : @"application/vnd.palm",
            @"org" : @"application/vnd.lotus-organizer",
            @"osf" : @"application/vnd.yamaha.openscoreformat",
            @"osfpvg" : @"application/vnd.yamaha.openscoreformat.osfpvg+xml",
            @"otc" : @"application/vnd.oasis.opendocument.chart-template",
            @"otf" : @"application/x-font-otf",
            @"otg" : @"application/vnd.oasis.opendocument.graphics-template",
            @"oth" : @"application/vnd.oasis.opendocument.text-web",
            @"oti" : @"application/vnd.oasis.opendocument.image-template",
            @"otp" : @"application/vnd.oasis.opendocument.presentation-template",
            @"ots" : @"application/vnd.oasis.opendocument.spreadsheet-template",
            @"ott" : @"application/vnd.oasis.opendocument.text-template",
            @"oxps" : @"application/oxps",
            @"oxt" : @"application/vnd.openofficeorg.extension",
            @"p" : @"text/x-pascal",
            @"p10" : @"application/pkcs10",
            @"p12" : @"application/x-pkcs12",
            @"p7b" : @"application/x-pkcs7-certificates",
            @"p7c" : @"application/pkcs7-mime",
            @"p7m" : @"application/pkcs7-mime",
            @"p7r" : @"application/x-pkcs7-certreqresp",
            @"p7s" : @"application/pkcs7-signature",
            @"p8" : @"application/pkcs8",
            @"pas" : @"text/x-pascal",
            @"paw" : @"application/vnd.pawaafile",
            @"pbd" : @"application/vnd.powerbuilder6",
            @"pbm" : @"image/x-portable-bitmap",
            @"pcap" : @"application/vnd.tcpdump.pcap",
            @"pcf" : @"application/x-font-pcf",
            @"pcl" : @"application/vnd.hp-pcl",
            @"pclxl" : @"application/vnd.hp-pclxl",
            @"pct" : @"image/x-pict",
            @"pcurl" : @"application/vnd.curl.pcurl",
            @"pcx" : @"image/x-pcx",
            @"pdb" : @"application/vnd.palm",
            @"pdf" : @"application/pdf",
            @"pfa" : @"application/x-font-type1",
            @"pfb" : @"application/x-font-type1",
            @"pfm" : @"application/x-font-type1",
            @"pfr" : @"application/font-tdpfr",
            @"pfx" : @"application/x-pkcs12",
            @"pgm" : @"image/x-portable-graymap",
            @"pgn" : @"application/x-chess-pgn",
            @"pgp" : @"application/pgp-encrypted",
            @"pic" : @"image/x-pict",
            @"pkg" : @"application/octet-stream",
            @"pki" : @"application/pkixcmp",
            @"pkipath" : @"application/pkix-pkipath",
            @"plb" : @"application/vnd.3gpp.pic-bw-large",
            @"plc" : @"application/vnd.mobius.plc",
            @"plf" : @"application/vnd.pocketlearn",
            @"pls" : @"application/pls+xml",
            @"pml" : @"application/vnd.ctc-posml",
            @"png" : @"image/png",
            @"pnm" : @"image/x-portable-anymap",
            @"portpkg" : @"application/vnd.macports.portpkg",
            @"pot" : @"application/vnd.ms-powerpoint",
            @"potm" : @"application/vnd.ms-powerpoint.template.macroenabled.12",
            @"potx" : @"application/vnd.openxmlformats-officedocument.presentationml.template",
            @"ppam" : @"application/vnd.ms-powerpoint.addin.macroenabled.12",
            @"ppd" : @"application/vnd.cups-ppd",
            @"ppm" : @"image/x-portable-pixmap",
            @"pps" : @"application/vnd.ms-powerpoint",
            @"ppsm" : @"application/vnd.ms-powerpoint.slideshow.macroenabled.12",
            @"ppsx" : @"application/vnd.openxmlformats-officedocument.presentationml.slideshow",
            @"ppt" : @"application/vnd.ms-powerpoint",
            @"pptm" : @"application/vnd.ms-powerpoint.presentation.macroenabled.12",
            @"pptx" : @"application/vnd.openxmlformats-officedocument.presentationml.presentation",
            @"pqa" : @"application/vnd.palm",
            @"prc" : @"application/x-mobipocket-ebook",
            @"pre" : @"application/vnd.lotus-freelance",
            @"prf" : @"application/pics-rules",
            @"ps" : @"application/postscript",
            @"psb" : @"application/vnd.3gpp.pic-bw-small",
            @"psd" : @"image/vnd.adobe.photoshop",
            @"psf" : @"application/x-font-linux-psf",
            @"pskcxml" : @"application/pskc+xml",
            @"ptid" : @"application/vnd.pvi.ptid1",
            @"pub" : @"application/x-mspublisher",
            @"pvb" : @"application/vnd.3gpp.pic-bw-var",
            @"pwn" : @"application/vnd.3m.post-it-notes",
            @"pya" : @"audio/vnd.ms-playready.media.pya",
            @"pyv" : @"video/vnd.ms-playready.media.pyv",
            @"qam" : @"application/vnd.epson.quickanime",
            @"qbo" : @"application/vnd.intu.qbo",
            @"qfx" : @"application/vnd.intu.qfx",
            @"qps" : @"application/vnd.publishare-delta-tree",
            @"qt" : @"video/quicktime",
            @"qwd" : @"application/vnd.quark.quarkxpress",
            @"qwt" : @"application/vnd.quark.quarkxpress",
            @"qxb" : @"application/vnd.quark.quarkxpress",
            @"qxd" : @"application/vnd.quark.quarkxpress",
            @"qxl" : @"application/vnd.quark.quarkxpress",
            @"qxt" : @"application/vnd.quark.quarkxpress",
            @"ra" : @"audio/x-pn-realaudio",
            @"ram" : @"audio/x-pn-realaudio",
            @"rar" : @"application/x-rar-compressed",
            @"ras" : @"image/x-cmu-raster",
            @"rcprofile" : @"application/vnd.ipunplugged.rcprofile",
            @"rdf" : @"application/rdf+xml",
            @"rdz" : @"application/vnd.data-vision.rdz",
            @"rep" : @"application/vnd.businessobjects",
            @"res" : @"application/x-dtbresource+xml",
            @"rgb" : @"image/x-rgb",
            @"rif" : @"application/reginfo+xml",
            @"rip" : @"audio/vnd.rip",
            @"ris" : @"application/x-research-info-systems",
            @"rl" : @"application/resource-lists+xml",
            @"rlc" : @"image/vnd.fujixerox.edmics-rlc",
            @"rld" : @"application/resource-lists-diff+xml",
            @"rm" : @"application/vnd.rn-realmedia",
            @"rmi" : @"audio/midi",
            @"rmp" : @"audio/x-pn-realaudio-plugin",
            @"rms" : @"application/vnd.jcp.javame.midlet-rms",
            @"rmvb" : @"application/vnd.rn-realmedia-vbr",
            @"rnc" : @"application/relax-ng-compact-syntax",
            @"roa" : @"application/rpki-roa",
            @"roff" : @"text/troff",
            @"rp9" : @"application/vnd.cloanto.rp9",
            @"rpss" : @"application/vnd.nokia.radio-presets",
            @"rpst" : @"application/vnd.nokia.radio-preset",
            @"rq" : @"application/sparql-query",
            @"rs" : @"application/rls-services+xml",
            @"rsd" : @"application/rsd+xml",
            @"rss" : @"application/rss+xml",
            @"rtf" : @"application/rtf",
            @"rtx" : @"text/richtext",
            @"s" : @"text/x-asm",
            @"s3m" : @"audio/s3m",
            @"saf" : @"application/vnd.yamaha.smaf-audio",
            @"sbml" : @"application/sbml+xml",
            @"sc" : @"application/vnd.ibm.secure-container",
            @"scd" : @"application/x-msschedule",
            @"scm" : @"application/vnd.lotus-screencam",
            @"scq" : @"application/scvp-cv-request",
            @"scs" : @"application/scvp-cv-response",
            @"scurl" : @"text/vnd.curl.scurl",
            @"sda" : @"application/vnd.stardivision.draw",
            @"sdc" : @"application/vnd.stardivision.calc",
            @"sdd" : @"application/vnd.stardivision.impress",
            @"sdkd" : @"application/vnd.solent.sdkm+xml",
            @"sdkm" : @"application/vnd.solent.sdkm+xml",
            @"sdp" : @"application/sdp",
            @"sdw" : @"application/vnd.stardivision.writer",
            @"see" : @"application/vnd.seemail",
            @"seed" : @"application/vnd.fdsn.seed",
            @"sema" : @"application/vnd.sema",
            @"semd" : @"application/vnd.semd",
            @"semf" : @"application/vnd.semf",
            @"ser" : @"application/java-serialized-object",
            @"setpay" : @"application/set-payment-initiation",
            @"setreg" : @"application/set-registration-initiation",
            @"sfd-hdstx" : @"application/vnd.hydrostatix.sof-data",
            @"sfs" : @"application/vnd.spotfire.sfs",
            @"sfv" : @"text/x-sfv",
            @"sgi" : @"image/sgi",
            @"sgl" : @"application/vnd.stardivision.writer-global",
            @"sgm" : @"text/sgml",
            @"sgml" : @"text/sgml",
            @"sh" : @"application/x-sh",
            @"shar" : @"application/x-shar",
            @"shf" : @"application/shf+xml",
            @"sid" : @"image/x-mrsid-image",
            @"sig" : @"application/pgp-signature",
            @"sil" : @"audio/silk",
            @"silo" : @"model/mesh",
            @"sis" : @"application/vnd.symbian.install",
            @"sisx" : @"application/vnd.symbian.install",
            @"sit" : @"application/x-stuffit",
            @"sitx" : @"application/x-stuffitx",
            @"skd" : @"application/vnd.koan",
            @"skm" : @"application/vnd.koan",
            @"skp" : @"application/vnd.koan",
            @"skt" : @"application/vnd.koan",
            @"sldm" : @"application/vnd.ms-powerpoint.slide.macroenabled.12",
            @"sldx" : @"application/vnd.openxmlformats-officedocument.presentationml.slide",
            @"slt" : @"application/vnd.epson.salt",
            @"sm" : @"application/vnd.stepmania.stepchart",
            @"smf" : @"application/vnd.stardivision.math",
            @"smi" : @"application/smil+xml",
            @"smil" : @"application/smil+xml",
            @"smv" : @"video/x-smv",
            @"smzip" : @"application/vnd.stepmania.package",
            @"snd" : @"audio/basic",
            @"snf" : @"application/x-font-snf",
            @"so" : @"application/octet-stream",
            @"spc" : @"application/x-pkcs7-certificates",
            @"spf" : @"application/vnd.yamaha.smaf-phrase",
            @"spl" : @"application/x-futuresplash",
            @"spot" : @"text/vnd.in3d.spot",
            @"spp" : @"application/scvp-vp-response",
            @"spq" : @"application/scvp-vp-request",
            @"spx" : @"audio/ogg",
            @"sql" : @"application/x-sql",
            @"src" : @"application/x-wais-source",
            @"srt" : @"application/x-subrip",
            @"sru" : @"application/sru+xml",
            @"srx" : @"application/sparql-results+xml",
            @"ssdl" : @"application/ssdl+xml",
            @"sse" : @"application/vnd.kodak-descriptor",
            @"ssf" : @"application/vnd.epson.ssf",
            @"ssml" : @"application/ssml+xml",
            @"st" : @"application/vnd.sailingtracker.track",
            @"stc" : @"application/vnd.sun.xml.calc.template",
            @"std" : @"application/vnd.sun.xml.draw.template",
            @"stf" : @"application/vnd.wt.stf",
            @"sti" : @"application/vnd.sun.xml.impress.template",
            @"stk" : @"application/hyperstudio",
            @"stl" : @"application/vnd.ms-pki.stl",
            @"str" : @"application/vnd.pg.format",
            @"stw" : @"application/vnd.sun.xml.writer.template",
            @"sub" : @"text/vnd.dvb.subtitle",
            @"sus" : @"application/vnd.sus-calendar",
            @"susp" : @"application/vnd.sus-calendar",
            @"sv4cpio" : @"application/x-sv4cpio",
            @"sv4crc" : @"application/x-sv4crc",
            @"svc" : @"application/vnd.dvb.service",
            @"svd" : @"application/vnd.svd",
            @"svg" : @"image/svg+xml",
            @"svgz" : @"image/svg+xml",
            @"swa" : @"application/x-director",
            @"swf" : @"application/x-shockwave-flash",
            @"swi" : @"application/vnd.aristanetworks.swi",
            @"sxc" : @"application/vnd.sun.xml.calc",
            @"sxd" : @"application/vnd.sun.xml.draw",
            @"sxg" : @"application/vnd.sun.xml.writer.global",
            @"sxi" : @"application/vnd.sun.xml.impress",
            @"sxm" : @"application/vnd.sun.xml.math",
            @"sxw" : @"application/vnd.sun.xml.writer",
            @"t" : @"text/troff",
            @"t3" : @"application/x-t3vm-image",
            @"taglet" : @"application/vnd.mynfc",
            @"tao" : @"application/vnd.tao.intent-module-archive",
            @"tar" : @"application/x-tar",
            @"tcap" : @"application/vnd.3gpp2.tcap",
            @"tcl" : @"application/x-tcl",
            @"teacher" : @"application/vnd.smart.teacher",
            @"tei" : @"application/tei+xml",
            @"teicorpus" : @"application/tei+xml",
            @"tex" : @"application/x-tex",
            @"texi" : @"application/x-texinfo",
            @"texinfo" : @"application/x-texinfo",
            @"text" : @"text/plain",
            @"tfi" : @"application/thraud+xml",
            @"tfm" : @"application/x-tex-tfm",
            @"tga" : @"image/x-tga",
            @"thmx" : @"application/vnd.ms-officetheme",
            @"tif" : @"image/tiff",
            @"tiff" : @"image/tiff",
            @"tmo" : @"application/vnd.tmobile-livetv",
            @"torrent" : @"application/x-bittorrent",
            @"tpl" : @"application/vnd.groove-tool-template",
            @"tpt" : @"application/vnd.trid.tpt",
            @"tr" : @"text/troff",
            @"tra" : @"application/vnd.trueapp",
            @"trm" : @"application/x-msterminal",
            @"tsd" : @"application/timestamped-data",
            @"tsv" : @"text/tab-separated-values",
            @"ttc" : @"application/x-font-ttf",
            @"ttf" : @"application/x-font-ttf",
            @"ttl" : @"text/turtle",
            @"twd" : @"application/vnd.simtech-mindmapper",
            @"twds" : @"application/vnd.simtech-mindmapper",
            @"txd" : @"application/vnd.genomatix.tuxedo",
            @"txf" : @"application/vnd.mobius.txf",
            @"txt" : @"text/plain",
            @"u32" : @"application/x-authorware-bin",
            @"udeb" : @"application/x-debian-package",
            @"ufd" : @"application/vnd.ufdl",
            @"ufdl" : @"application/vnd.ufdl",
            @"ulx" : @"application/x-glulx",
            @"umj" : @"application/vnd.umajin",
            @"unityweb" : @"application/vnd.unity",
            @"uoml" : @"application/vnd.uoml+xml",
            @"uri" : @"text/uri-list",
            @"uris" : @"text/uri-list",
            @"urls" : @"text/uri-list",
            @"ustar" : @"application/x-ustar",
            @"utz" : @"application/vnd.uiq.theme",
            @"uu" : @"text/x-uuencode",
            @"uva" : @"audio/vnd.dece.audio",
            @"uvd" : @"application/vnd.dece.data",
            @"uvf" : @"application/vnd.dece.data",
            @"uvg" : @"image/vnd.dece.graphic",
            @"uvh" : @"video/vnd.dece.hd",
            @"uvi" : @"image/vnd.dece.graphic",
            @"uvm" : @"video/vnd.dece.mobile",
            @"uvp" : @"video/vnd.dece.pd",
            @"uvs" : @"video/vnd.dece.sd",
            @"uvt" : @"application/vnd.dece.ttml+xml",
            @"uvu" : @"video/vnd.uvvu.mp4",
            @"uvv" : @"video/vnd.dece.video",
            @"uvva" : @"audio/vnd.dece.audio",
            @"uvvd" : @"application/vnd.dece.data",
            @"uvvf" : @"application/vnd.dece.data",
            @"uvvg" : @"image/vnd.dece.graphic",
            @"uvvh" : @"video/vnd.dece.hd",
            @"uvvi" : @"image/vnd.dece.graphic",
            @"uvvm" : @"video/vnd.dece.mobile",
            @"uvvp" : @"video/vnd.dece.pd",
            @"uvvs" : @"video/vnd.dece.sd",
            @"uvvt" : @"application/vnd.dece.ttml+xml",
            @"uvvu" : @"video/vnd.uvvu.mp4",
            @"uvvv" : @"video/vnd.dece.video",
            @"uvvx" : @"application/vnd.dece.unspecified",
            @"uvvz" : @"application/vnd.dece.zip",
            @"uvx" : @"application/vnd.dece.unspecified",
            @"uvz" : @"application/vnd.dece.zip",
            @"vcard" : @"text/vcard",
            @"vcd" : @"application/x-cdlink",
            @"vcf" : @"text/x-vcard",
            @"vcg" : @"application/vnd.groove-vcard",
            @"vcs" : @"text/x-vcalendar",
            @"vcx" : @"application/vnd.vcx",
            @"vis" : @"application/vnd.visionary",
            @"viv" : @"video/vnd.vivo",
            @"vob" : @"video/x-ms-vob",
            @"vor" : @"application/vnd.stardivision.writer",
            @"vox" : @"application/x-authorware-bin",
            @"vrml" : @"model/vrml",
            @"vsd" : @"application/vnd.visio",
            @"vsf" : @"application/vnd.vsf",
            @"vss" : @"application/vnd.visio",
            @"vst" : @"application/vnd.visio",
            @"vsw" : @"application/vnd.visio",
            @"vtu" : @"model/vnd.vtu",
            @"vxml" : @"application/voicexml+xml",
            @"w3d" : @"application/x-director",
            @"wad" : @"application/x-doom",
            @"wav" : @"audio/x-wav",
            @"wax" : @"audio/x-ms-wax",
            @"wbmp" : @"image/vnd.wap.wbmp",
            @"wbs" : @"application/vnd.criticaltools.wbs+xml",
            @"wbxml" : @"application/vnd.wap.wbxml",
            @"wcm" : @"application/vnd.ms-works",
            @"wdb" : @"application/vnd.ms-works",
            @"wdp" : @"image/vnd.ms-photo",
            @"weba" : @"audio/webm",
            @"webm" : @"video/webm",
            @"webp" : @"image/webp",
            @"wg" : @"application/vnd.pmi.widget",
            @"wgt" : @"application/widget",
            @"wks" : @"application/vnd.ms-works",
            @"wm" : @"video/x-ms-wm",
            @"wma" : @"audio/x-ms-wma",
            @"wmd" : @"application/x-ms-wmd",
            @"wmf" : @"application/x-msmetafile",
            @"wml" : @"text/vnd.wap.wml",
            @"wmlc" : @"application/vnd.wap.wmlc",
            @"wmls" : @"text/vnd.wap.wmlscript",
            @"wmlsc" : @"application/vnd.wap.wmlscriptc",
            @"wmv" : @"video/x-ms-wmv",
            @"wmx" : @"video/x-ms-wmx",
            @"wmz" : @"application/x-msmetafile",
            @"woff" : @"application/font-woff",
            @"wpd" : @"application/vnd.wordperfect",
            @"wpl" : @"application/vnd.ms-wpl",
            @"wps" : @"application/vnd.ms-works",
            @"wqd" : @"application/vnd.wqd",
            @"wri" : @"application/x-mswrite",
            @"wrl" : @"model/vrml",
            @"wsdl" : @"application/wsdl+xml",
            @"wspolicy" : @"application/wspolicy+xml",
            @"wtb" : @"application/vnd.webturbo",
            @"wvx" : @"video/x-ms-wvx",
            @"x32" : @"application/x-authorware-bin",
            @"x3d" : @"model/x3d+xml",
            @"x3db" : @"model/x3d+binary",
            @"x3dbz" : @"model/x3d+binary",
            @"x3dv" : @"model/x3d+vrml",
            @"x3dvz" : @"model/x3d+vrml",
            @"x3dz" : @"model/x3d+xml",
            @"xaml" : @"application/xaml+xml",
            @"xap" : @"application/x-silverlight-app",
            @"xar" : @"application/vnd.xara",
            @"xbap" : @"application/x-ms-xbap",
            @"xbd" : @"application/vnd.fujixerox.docuworks.binder",
            @"xbm" : @"image/x-xbitmap",
            @"xdf" : @"application/xcap-diff+xml",
            @"xdm" : @"application/vnd.syncml.dm+xml",
            @"xdp" : @"application/vnd.adobe.xdp+xml",
            @"xdssc" : @"application/dssc+xml",
            @"xdw" : @"application/vnd.fujixerox.docuworks",
            @"xenc" : @"application/xenc+xml",
            @"xer" : @"application/patch-ops-error+xml",
            @"xfdf" : @"application/vnd.adobe.xfdf",
            @"xfdl" : @"application/vnd.xfdl",
            @"xht" : @"application/xhtml+xml",
            @"xhtml" : @"application/xhtml+xml",
            @"xhvml" : @"application/xv+xml",
            @"xif" : @"image/vnd.xiff",
            @"xla" : @"application/vnd.ms-excel",
            @"xlam" : @"application/vnd.ms-excel.addin.macroenabled.12",
            @"xlc" : @"application/vnd.ms-excel",
            @"xlf" : @"application/x-xliff+xml",
            @"xlm" : @"application/vnd.ms-excel",
            @"xls" : @"application/vnd.ms-excel",
            @"xlsb" : @"application/vnd.ms-excel.sheet.binary.macroenabled.12",
            @"xlsm" : @"application/vnd.ms-excel.sheet.macroenabled.12",
            @"xlsx" : @"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            @"xlt" : @"application/vnd.ms-excel",
            @"xltm" : @"application/vnd.ms-excel.template.macroenabled.12",
            @"xltx" : @"application/vnd.openxmlformats-officedocument.spreadsheetml.template",
            @"xlw" : @"application/vnd.ms-excel",
            @"xm" : @"audio/xm",
            @"xml" : @"application/xml",
            @"xo" : @"application/vnd.olpc-sugar",
            @"xop" : @"application/xop+xml",
            @"xpi" : @"application/x-xpinstall",
            @"xpl" : @"application/xproc+xml",
            @"xpm" : @"image/x-xpixmap",
            @"xpr" : @"application/vnd.is-xpr",
            @"xps" : @"application/vnd.ms-xpsdocument",
            @"xpw" : @"application/vnd.intercon.formnet",
            @"xpx" : @"application/vnd.intercon.formnet",
            @"xsl" : @"application/xml",
            @"xslt" : @"application/xslt+xml",
            @"xsm" : @"application/vnd.syncml+xml",
            @"xspf" : @"application/xspf+xml",
            @"xul" : @"application/vnd.mozilla.xul+xml",
            @"xvm" : @"application/xv+xml",
            @"xvml" : @"application/xv+xml",
            @"xwd" : @"image/x-xwindowdump",
            @"xyz" : @"chemical/x-xyz",
            @"xz" : @"application/x-xz",
            @"yang" : @"application/yang",
            @"yin" : @"application/yin+xml",
            @"z1" : @"application/x-zmachine",
            @"z2" : @"application/x-zmachine",
            @"z3" : @"application/x-zmachine",
            @"z4" : @"application/x-zmachine",
            @"z5" : @"application/x-zmachine",
            @"z6" : @"application/x-zmachine",
            @"z7" : @"application/x-zmachine",
            @"z8" : @"application/x-zmachine",
            @"zaz" : @"application/vnd.zzazz.deck+xml",
            @"zip" : OWSMimeTypeApplicationZip,
            @"zir" : @"application/vnd.zul",
            @"zirz" : @"application/vnd.zul",
            @"zmm" : @"application/vnd.handheld-entertainment+xml",
        };
    });
    return result;
}

+ (nullable NSString *)fileExtensionForMIMETypeViaLookup:(NSString *)mimeType
{
    return [[self genericMIMETypesToExtensionTypes] objectForKey:mimeType];
}

+ (nullable NSString *)fileExtensionForMIMEType:(NSString *)mimeType
{
    // Try to deduce the file extension by using a lookup table.
    //
    // This should be more accurate than deducing the file extension by
    // converting to a UTI type.  For example, .m4a files will have a
    // UTI type of kUTTypeMPEG4Audio which incorrectly yields the file
    // extension .mp4 instead of .m4a.
    NSString *_Nullable fileExtension = [self fileExtensionForMIMETypeViaLookup:mimeType];
    if (!fileExtension) {
        // Try to deduce the file extension by converting to a UTI type.
        fileExtension = [self fileExtensionForMIMETypeViaUTIType:mimeType];
    }
    return fileExtension;
}

+ (nullable NSString *)utiTypeForFileExtension:(NSString *)fileExtension
{
    NSString *_Nullable utiType = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(
        kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtension, NULL);
    return utiType;
}

@end

NS_ASSUME_NONNULL_END