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Add image format detect of HEIC (One type of HEIF which use HEVC codec). This is supported natively in iOS 11 & macOS 10.13

This commit is contained in:
DreamPiggy 2017-10-26 22:12:25 +08:00
parent 292078c0be
commit 4f7116afe9
2 changed files with 21 additions and 9 deletions
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3
SDWebImage/NSData+ImageContentType.h
View File

@ -16,7 +16,8 @@ typedef NS_ENUM(NSInteger, SDImageFormat) {
SDImageFormatPNG,
SDImageFormatGIF,
SDImageFormatTIFF,
SDImageFormatWebP
SDImageFormatWebP,
SDImageFormatHEIC
};
@interface NSData (ImageContentType)

27
SDWebImage/NSData+ImageContentType.m
View File

@ -21,6 +21,7 @@
return SDImageFormatUndefined;
}
// File signatures table: http://www.garykessler.net/library/file_sigs.html
uint8_t c;
[data getBytes:&c length:1];
switch (c) {
@ -33,16 +34,26 @@
case 0x49:
case 0x4D:
return SDImageFormatTIFF;
case 0x52:
// R as RIFF for WEBP
if (data.length < 12) {
return SDImageFormatUndefined;
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;
}
}
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
NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(4, 8)] encoding:NSASCIIStringEncoding];
if ([testString hasPrefix:@"ftyp"] && [testString hasSuffix:@"heic"]) {
return SDImageFormatHEIC;
}
}
break;
}
}
return SDImageFormatUndefined;
}