41 lines
1.6 KiB
Objective-C
41 lines
1.6 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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ows_require(offset <= self.length - sizeof(uint16_t));
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return (uint16_t)[self uint8At:1 + offset] | (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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ows_require(offset <= self.length - sizeof(uint32_t));
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return ((uint32_t)[self uint8At:3 + offset] << 0) | ((uint32_t)[self uint8At:2 + offset] << 8) |
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((uint32_t)[self uint8At:1 + offset] << 16) | ((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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