44 lines
1.5 KiB
Objective-C
44 lines
1.5 KiB
Objective-C
#import "Conversions.h"
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#import "Util.h"
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@implementation NSData (Conversions)
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-(uint16_t) bigEndianUInt16At:(NSUInteger)offset {
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require(offset <= self.length-sizeof(uint16_t));
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return (uint16_t)[self uint8At:1+offset]
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| (uint16_t)((uint16_t)[self uint8At:0+offset] << 8);
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}
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-(uint32_t) bigEndianUInt32At:(NSUInteger)offset {
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require(offset <= self.length-sizeof(uint32_t));
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return ((uint32_t)[self uint8At:3+offset] << 0)
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| ((uint32_t)[self uint8At:2+offset] << 8)
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| ((uint32_t)[self uint8At:1+offset] << 16)
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| ((uint32_t)[self uint8At:0+offset] << 24);
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}
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+(NSData*) dataWithBigEndianBytesOfUInt16:(uint16_t)value {
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uint8_t d[sizeof(uint16_t)];
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d[1] = (uint8_t)((value >> 0) & 0xFF);
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d[0] = (uint8_t)((value >> 8) & 0xFF);
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return [NSData dataWithBytes:d length:sizeof(uint16_t)];
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}
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+(NSData*) dataWithBigEndianBytesOfUInt32:(uint32_t)value {
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uint8_t d[sizeof(uint32_t)];
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d[3] = (uint8_t)((value >> 0) & 0xFF);
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d[2] = (uint8_t)((value >> 8) & 0xFF);
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d[1] = (uint8_t)((value >> 16) & 0xFF);
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d[0] = (uint8_t)((value >> 24) & 0xFF);
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return [NSData dataWithBytes:d length:sizeof(uint32_t)];
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}
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+(NSData*) switchEndiannessOfData:(NSData*)data{
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const void* bytes = [data bytes];
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NSMutableData* switchedEndianData = [NSMutableData new];
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for (NSUInteger i = data.length; i > 0; --i){
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uint8_t byte = *(((uint8_t*)(bytes))+((i-1)*sizeof(uint8_t)));
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[switchedEndianData appendData:[NSData dataWithBytes:&byte length:sizeof(byte)]];
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}
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return switchedEndianData;
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}
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@end
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