iOS开发关于“发送原图”功能问题的记录

uint8_t c;

[data getBytes:&c length:1];

switch (c) {

case 0xFF:

return SDImageFormatJPEG;

case 0x89:

return SDImageFormatPNG;

case 0x47:

return SDImageFormatGIF;

case 0x49:

case 0x4D:

return SDImageFormatTIFF;

case 0x52: {

if (data.length >= 12) {

//RIFF....WEBP

NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];

if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) {

return SDImageFormatWebP;

}

break;

}

case 0x00: {

if (data.length >= 12) {

//....ftypheic ....ftypheix ....ftyphevc ....ftyphevx

NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(4, 8)] encoding:NSASCIIStringEncoding];

if ([testString isEqualToString:@"ftypheic"]

|| [testString isEqualToString:@"ftypheix"]

|| [testString isEqualToString:@"ftyphevc"]

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