NSData+ImageContentType.m
2.82 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
* (c) Fabrice Aneche
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import "NSData+ImageContentType.h"
#if SD_MAC
#import <CoreServices/CoreServices.h>
#else
#import <MobileCoreServices/MobileCoreServices.h>
#endif
// Currently Image/IO does not support WebP
#define kSDUTTypeWebP ((__bridge CFStringRef)@"public.webp")
// AVFileTypeHEIC is defined in AVFoundation via iOS 11, we use this without import AVFoundation
#define kSDUTTypeHEIC ((__bridge CFStringRef)@"public.heic")
@implementation NSData (ImageContentType)
+ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
if (!data) {
return SDImageFormatUndefined;
}
// File signatures table: http://www.garykessler.net/library/file_sigs.html
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
NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(4, 8)] encoding:NSASCIIStringEncoding];
if ([testString isEqualToString:@"ftypheic"]) {
return SDImageFormatHEIC;
}
}
break;
}
}
return SDImageFormatUndefined;
}
+ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format {
CFStringRef UTType;
switch (format) {
case SDImageFormatJPEG:
UTType = kUTTypeJPEG;
break;
case SDImageFormatPNG:
UTType = kUTTypePNG;
break;
case SDImageFormatGIF:
UTType = kUTTypeGIF;
break;
case SDImageFormatTIFF:
UTType = kUTTypeTIFF;
break;
case SDImageFormatWebP:
UTType = kSDUTTypeWebP;
break;
case SDImageFormatHEIC:
UTType = kSDUTTypeHEIC;
break;
default:
// default is kUTTypePNG
UTType = kUTTypePNG;
break;
}
return UTType;
}
@end