/*
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* This file is part of the SDWebImage package.
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* (c) Olivier Poitrey <rs@dailymotion.com>
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* (c) Fabrice Aneche
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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#import "NSData+ImageContentType.h"
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#if SD_MAC
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#import <CoreServices/CoreServices.h>
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#else
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#import <MobileCoreServices/MobileCoreServices.h>
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#endif
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// Currently Image/IO does not support WebP
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#define kSDUTTypeWebP ((__bridge CFStringRef)@"public.webp")
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// AVFileTypeHEIC is defined in AVFoundation via iOS 11, we use this without import AVFoundation
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#define kSDUTTypeHEIC ((__bridge CFStringRef)@"public.heic")
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@implementation NSData (ImageContentType)
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+ (SDImageFormat)sd_imageFormatForImageData:(nullable NSData *)data {
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if (!data) {
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return SDImageFormatUndefined;
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}
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// File signatures table: http://www.garykessler.net/library/file_sigs.html
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uint8_t c;
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[data getBytes:&c length:1];
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switch (c) {
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case 0xFF:
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return SDImageFormatJPEG;
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case 0x89:
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return SDImageFormatPNG;
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case 0x47:
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return SDImageFormatGIF;
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case 0x49:
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case 0x4D:
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return SDImageFormatTIFF;
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case 0x52: {
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if (data.length >= 12) {
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//RIFF....WEBP
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NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
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if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) {
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return SDImageFormatWebP;
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}
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}
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break;
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}
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case 0x00: {
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if (data.length >= 12) {
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//....ftypheic ....ftypheix ....ftyphevc ....ftyphevx
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NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(4, 8)] encoding:NSASCIIStringEncoding];
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if ([testString isEqualToString:@"ftypheic"]
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|| [testString isEqualToString:@"ftypheix"]
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|| [testString isEqualToString:@"ftyphevc"]
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|| [testString isEqualToString:@"ftyphevx"]) {
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return SDImageFormatHEIC;
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}
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}
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break;
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}
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}
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return SDImageFormatUndefined;
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}
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+ (nonnull CFStringRef)sd_UTTypeFromSDImageFormat:(SDImageFormat)format {
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CFStringRef UTType;
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switch (format) {
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case SDImageFormatJPEG:
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UTType = kUTTypeJPEG;
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break;
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case SDImageFormatPNG:
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UTType = kUTTypePNG;
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break;
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case SDImageFormatGIF:
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UTType = kUTTypeGIF;
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break;
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case SDImageFormatTIFF:
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UTType = kUTTypeTIFF;
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break;
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case SDImageFormatWebP:
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UTType = kSDUTTypeWebP;
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break;
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case SDImageFormatHEIC:
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UTType = kSDUTTypeHEIC;
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break;
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default:
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// default is kUTTypePNG
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UTType = kUTTypePNG;
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break;
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}
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return UTType;
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}
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@end
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