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September 1, 2016 11:03
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Get contentTypeForImageData from image byte header
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- (NSString *)contentTypeForImageData:(NSData *)data { | |
uint8_t c; | |
[data getBytes:&c length:1]; | |
switch (c) { | |
case 0xFF: | |
return @"jpeg"; | |
case 0x89: | |
return @"png"; | |
case 0x47: | |
return @"gif"; | |
case 0x49: | |
case 0x4D: | |
return @"tiff"; | |
} | |
return nil; | |
} |
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