/*
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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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*
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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 "SDImageCache.h"
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#import "SDWebImageDecoder.h"
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#import "UIImage+MultiFormat.h"
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#import <CommonCrypto/CommonDigest.h>
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// See https://github.com/rs/SDWebImage/pull/1141 for discussion
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@interface AutoPurgeCache : NSCache
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@end
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@implementation AutoPurgeCache
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- (id)init
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{
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self = [super init];
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if (self) {
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(removeAllObjects) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
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}
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
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}
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@end
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static const NSInteger kDefaultCacheMaxCacheAge = 60 * 60 * 24 * 7; // 1 week
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// PNG signature bytes and data (below)
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static unsigned char kPNGSignatureBytes[8] = {0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A};
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static NSData *kPNGSignatureData = nil;
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BOOL ImageDataHasPNGPreffix(NSData *data);
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BOOL ImageDataHasPNGPreffix(NSData *data) {
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NSUInteger pngSignatureLength = [kPNGSignatureData length];
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if ([data length] >= pngSignatureLength) {
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if ([[data subdataWithRange:NSMakeRange(0, pngSignatureLength)] isEqualToData:kPNGSignatureData]) {
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return YES;
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}
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}
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return NO;
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}
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FOUNDATION_STATIC_INLINE NSUInteger SDCacheCostForImage(UIImage *image) {
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return image.size.height * image.size.width * image.scale * image.scale;
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}
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@interface SDImageCache ()
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@property (strong, nonatomic) NSCache *memCache;
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@property (strong, nonatomic) NSString *diskCachePath;
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@property (strong, nonatomic) NSMutableArray *customPaths;
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@property (SDDispatchQueueSetterSementics, nonatomic) dispatch_queue_t ioQueue;
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@end
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@implementation SDImageCache {
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NSFileManager *_fileManager;
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}
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+ (SDImageCache *)sharedImageCache {
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static dispatch_once_t once;
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static id instance;
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dispatch_once(&once, ^{
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instance = [self new];
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});
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return instance;
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}
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- (id)init {
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return [self initWithNamespace:@"default"];
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}
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- (id)initWithNamespace:(NSString *)ns {
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NSString *path = [self makeDiskCachePath:ns];
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return [self initWithNamespace:ns diskCacheDirectory:path];
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}
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- (id)initWithNamespace:(NSString *)ns diskCacheDirectory:(NSString *)directory {
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if ((self = [super init])) {
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NSString *fullNamespace = [@"com.hackemist.SDWebImageCache." stringByAppendingString:ns];
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// initialise PNG signature data
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kPNGSignatureData = [NSData dataWithBytes:kPNGSignatureBytes length:8];
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// Create IO serial queue
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_ioQueue = dispatch_queue_create("com.hackemist.SDWebImageCache", DISPATCH_QUEUE_SERIAL);
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// Init default values
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_maxCacheAge = kDefaultCacheMaxCacheAge;
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// Init the memory cache
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_memCache = [[AutoPurgeCache alloc] init];
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_memCache.name = fullNamespace;
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// Init the disk cache
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if (directory != nil) {
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_diskCachePath = [directory stringByAppendingPathComponent:fullNamespace];
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} else {
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NSString *path = [self makeDiskCachePath:ns];
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_diskCachePath = path;
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}
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// Set decompression to YES
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_shouldDecompressImages = YES;
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// memory cache enabled
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_shouldCacheImagesInMemory = YES;
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// Disable iCloud
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_shouldDisableiCloud = YES;
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dispatch_sync(_ioQueue, ^{
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_fileManager = [NSFileManager new];
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});
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#if TARGET_OS_IPHONE
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// Subscribe to app events
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(clearMemory)
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name:UIApplicationDidReceiveMemoryWarningNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(cleanDisk)
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name:UIApplicationWillTerminateNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(backgroundCleanDisk)
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name:UIApplicationDidEnterBackgroundNotification
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object:nil];
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#endif
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}
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return self;
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}
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- (void)dealloc {
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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SDDispatchQueueRelease(_ioQueue);
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}
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- (void)addReadOnlyCachePath:(NSString *)path {
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if (!self.customPaths) {
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self.customPaths = [NSMutableArray new];
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}
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if (![self.customPaths containsObject:path]) {
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[self.customPaths addObject:path];
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}
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}
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- (NSString *)cachePathForKey:(NSString *)key inPath:(NSString *)path {
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NSString *filename = [self cachedFileNameForKey:key];
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return [path stringByAppendingPathComponent:filename];
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}
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- (NSString *)defaultCachePathForKey:(NSString *)key {
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return [self cachePathForKey:key inPath:self.diskCachePath];
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}
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#pragma mark SDImageCache (private)
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- (NSString *)cachedFileNameForKey:(NSString *)key {
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const char *str = [key UTF8String];
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if (str == NULL) {
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str = "";
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}
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unsigned char r[CC_MD5_DIGEST_LENGTH];
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CC_MD5(str, (CC_LONG)strlen(str), r);
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NSString *filename = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%@",
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r[0], r[1], r[2], r[3], r[4], r[5], r[6], r[7], r[8], r[9], r[10],
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r[11], r[12], r[13], r[14], r[15], [[key pathExtension] isEqualToString:@""] ? @"" : [NSString stringWithFormat:@".%@", [key pathExtension]]];
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return filename;
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}
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#pragma mark ImageCache
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// Init the disk cache
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-(NSString *)makeDiskCachePath:(NSString*)fullNamespace{
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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
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return [paths[0] stringByAppendingPathComponent:fullNamespace];
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}
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- (void)storeImage:(UIImage *)image recalculateFromImage:(BOOL)recalculate imageData:(NSData *)imageData forKey:(NSString *)key toDisk:(BOOL)toDisk {
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if (!image || !key) {
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return;
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}
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// if memory cache is enabled
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if (self.shouldCacheImagesInMemory) {
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NSUInteger cost = SDCacheCostForImage(image);
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[self.memCache setObject:image forKey:key cost:cost];
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}
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if (toDisk) {
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dispatch_async(self.ioQueue, ^{
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NSData *data = imageData;
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if (image && (recalculate || !data)) {
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#if TARGET_OS_IPHONE
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// We need to determine if the image is a PNG or a JPEG
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// PNGs are easier to detect because they have a unique signature (http://www.w3.org/TR/PNG-Structure.html)
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// The first eight bytes of a PNG file always contain the following (decimal) values:
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// 137 80 78 71 13 10 26 10
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// If the imageData is nil (i.e. if trying to save a UIImage directly or the image was transformed on download)
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// and the image has an alpha channel, we will consider it PNG to avoid losing the transparency
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int alphaInfo = CGImageGetAlphaInfo(image.CGImage);
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BOOL hasAlpha = !(alphaInfo == kCGImageAlphaNone ||
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alphaInfo == kCGImageAlphaNoneSkipFirst ||
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alphaInfo == kCGImageAlphaNoneSkipLast);
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BOOL imageIsPng = hasAlpha;
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// But if we have an image data, we will look at the preffix
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if ([imageData length] >= [kPNGSignatureData length]) {
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imageIsPng = ImageDataHasPNGPreffix(imageData);
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}
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if (imageIsPng) {
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data = UIImagePNGRepresentation(image);
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}
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else {
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data = UIImageJPEGRepresentation(image, (CGFloat)1.0);
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}
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#else
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data = [NSBitmapImageRep representationOfImageRepsInArray:image.representations usingType: NSJPEGFileType properties:nil];
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#endif
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}
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if (data) {
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if (![_fileManager fileExistsAtPath:_diskCachePath]) {
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[_fileManager createDirectoryAtPath:_diskCachePath withIntermediateDirectories:YES attributes:nil error:NULL];
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}
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// get cache Path for image key
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NSString *cachePathForKey = [self defaultCachePathForKey:key];
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// transform to NSUrl
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NSURL *fileURL = [NSURL fileURLWithPath:cachePathForKey];
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[_fileManager createFileAtPath:cachePathForKey contents:data attributes:nil];
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// disable iCloud backup
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if (self.shouldDisableiCloud) {
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[fileURL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:nil];
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}
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}
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});
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}
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}
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- (void)storeImage:(UIImage *)image forKey:(NSString *)key {
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[self storeImage:image recalculateFromImage:YES imageData:nil forKey:key toDisk:YES];
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}
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- (void)storeImage:(UIImage *)image forKey:(NSString *)key toDisk:(BOOL)toDisk {
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[self storeImage:image recalculateFromImage:YES imageData:nil forKey:key toDisk:toDisk];
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}
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- (BOOL)diskImageExistsWithKey:(NSString *)key {
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BOOL exists = NO;
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// this is an exception to access the filemanager on another queue than ioQueue, but we are using the shared instance
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// from apple docs on NSFileManager: The methods of the shared NSFileManager object can be called from multiple threads safely.
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exists = [[NSFileManager defaultManager] fileExistsAtPath:[self defaultCachePathForKey:key]];
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// fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
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// checking the key with and without the extension
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if (!exists) {
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exists = [[NSFileManager defaultManager] fileExistsAtPath:[[self defaultCachePathForKey:key] stringByDeletingPathExtension]];
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}
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return exists;
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}
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- (void)diskImageExistsWithKey:(NSString *)key completion:(SDWebImageCheckCacheCompletionBlock)completionBlock {
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dispatch_async(_ioQueue, ^{
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BOOL exists = [_fileManager fileExistsAtPath:[self defaultCachePathForKey:key]];
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// fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
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// checking the key with and without the extension
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if (!exists) {
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exists = [_fileManager fileExistsAtPath:[[self defaultCachePathForKey:key] stringByDeletingPathExtension]];
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}
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if (completionBlock) {
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dispatch_async(dispatch_get_main_queue(), ^{
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completionBlock(exists);
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});
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}
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});
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}
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- (UIImage *)imageFromMemoryCacheForKey:(NSString *)key {
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return [self.memCache objectForKey:key];
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}
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- (UIImage *)imageFromDiskCacheForKey:(NSString *)key {
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// First check the in-memory cache...
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UIImage *image = [self imageFromMemoryCacheForKey:key];
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if (image) {
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return image;
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}
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// Second check the disk cache...
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UIImage *diskImage = [self diskImageForKey:key];
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if (diskImage && self.shouldCacheImagesInMemory) {
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NSUInteger cost = SDCacheCostForImage(diskImage);
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[self.memCache setObject:diskImage forKey:key cost:cost];
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}
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return diskImage;
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}
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- (NSData *)diskImageDataBySearchingAllPathsForKey:(NSString *)key {
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NSString *defaultPath = [self defaultCachePathForKey:key];
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NSData *data = [NSData dataWithContentsOfFile:defaultPath];
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if (data) {
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return data;
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}
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// fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
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// checking the key with and without the extension
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data = [NSData dataWithContentsOfFile:[defaultPath stringByDeletingPathExtension]];
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if (data) {
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return data;
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}
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NSArray *customPaths = [self.customPaths copy];
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for (NSString *path in customPaths) {
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NSString *filePath = [self cachePathForKey:key inPath:path];
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NSData *imageData = [NSData dataWithContentsOfFile:filePath];
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if (imageData) {
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return imageData;
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}
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// fallback because of https://github.com/rs/SDWebImage/pull/976 that added the extension to the disk file name
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// checking the key with and without the extension
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imageData = [NSData dataWithContentsOfFile:[filePath stringByDeletingPathExtension]];
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if (imageData) {
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return imageData;
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}
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}
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return nil;
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}
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- (UIImage *)diskImageForKey:(NSString *)key {
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NSData *data = [self diskImageDataBySearchingAllPathsForKey:key];
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if (data) {
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UIImage *image = [UIImage sd_imageWithData:data];
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image = [self scaledImageForKey:key image:image];
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if (self.shouldDecompressImages) {
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image = [UIImage decodedImageWithImage:image];
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}
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return image;
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}
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else {
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return nil;
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}
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}
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- (UIImage *)scaledImageForKey:(NSString *)key image:(UIImage *)image {
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return SDScaledImageForKey(key, image);
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}
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- (NSOperation *)queryDiskCacheForKey:(NSString *)key done:(SDWebImageQueryCompletedBlock)doneBlock {
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if (!doneBlock) {
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return nil;
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}
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if (!key) {
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doneBlock(nil, SDImageCacheTypeNone);
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return nil;
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}
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// First check the in-memory cache...
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UIImage *image = [self imageFromMemoryCacheForKey:key];
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if (image) {
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doneBlock(image, SDImageCacheTypeMemory);
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return nil;
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}
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NSOperation *operation = [NSOperation new];
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dispatch_async(self.ioQueue, ^{
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if (operation.isCancelled) {
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return;
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}
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@autoreleasepool {
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UIImage *diskImage = [self diskImageForKey:key];
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if (diskImage && self.shouldCacheImagesInMemory) {
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NSUInteger cost = SDCacheCostForImage(diskImage);
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[self.memCache setObject:diskImage forKey:key cost:cost];
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}
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dispatch_async(dispatch_get_main_queue(), ^{
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doneBlock(diskImage, SDImageCacheTypeDisk);
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});
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}
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});
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return operation;
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}
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- (void)removeImageForKey:(NSString *)key {
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[self removeImageForKey:key withCompletion:nil];
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}
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- (void)removeImageForKey:(NSString *)key withCompletion:(SDWebImageNoParamsBlock)completion {
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[self removeImageForKey:key fromDisk:YES withCompletion:completion];
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}
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- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk {
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[self removeImageForKey:key fromDisk:fromDisk withCompletion:nil];
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}
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- (void)removeImageForKey:(NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(SDWebImageNoParamsBlock)completion {
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if (key == nil) {
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return;
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}
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if (self.shouldCacheImagesInMemory) {
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[self.memCache removeObjectForKey:key];
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}
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if (fromDisk) {
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dispatch_async(self.ioQueue, ^{
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[_fileManager removeItemAtPath:[self defaultCachePathForKey:key] error:nil];
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if (completion) {
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dispatch_async(dispatch_get_main_queue(), ^{
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completion();
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});
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}
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});
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} else if (completion){
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completion();
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}
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}
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- (void)setMaxMemoryCost:(NSUInteger)maxMemoryCost {
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self.memCache.totalCostLimit = maxMemoryCost;
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}
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- (NSUInteger)maxMemoryCost {
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return self.memCache.totalCostLimit;
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}
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- (NSUInteger)maxMemoryCountLimit {
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return self.memCache.countLimit;
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}
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- (void)setMaxMemoryCountLimit:(NSUInteger)maxCountLimit {
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self.memCache.countLimit = maxCountLimit;
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}
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- (void)clearMemory {
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[self.memCache removeAllObjects];
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}
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- (void)clearDisk {
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[self clearDiskOnCompletion:nil];
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}
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- (void)clearDiskOnCompletion:(SDWebImageNoParamsBlock)completion
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{
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dispatch_async(self.ioQueue, ^{
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[_fileManager removeItemAtPath:self.diskCachePath error:nil];
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[_fileManager createDirectoryAtPath:self.diskCachePath
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withIntermediateDirectories:YES
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attributes:nil
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error:NULL];
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if (completion) {
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dispatch_async(dispatch_get_main_queue(), ^{
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completion();
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});
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}
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});
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}
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- (void)cleanDisk {
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[self cleanDiskWithCompletionBlock:nil];
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}
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- (void)cleanDiskWithCompletionBlock:(SDWebImageNoParamsBlock)completionBlock {
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dispatch_async(self.ioQueue, ^{
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NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
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NSArray *resourceKeys = @[NSURLIsDirectoryKey, NSURLContentModificationDateKey, NSURLTotalFileAllocatedSizeKey];
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// This enumerator prefetches useful properties for our cache files.
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NSDirectoryEnumerator *fileEnumerator = [_fileManager enumeratorAtURL:diskCacheURL
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includingPropertiesForKeys:resourceKeys
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options:NSDirectoryEnumerationSkipsHiddenFiles
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errorHandler:NULL];
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NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.maxCacheAge];
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NSMutableDictionary *cacheFiles = [NSMutableDictionary dictionary];
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NSUInteger currentCacheSize = 0;
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// Enumerate all of the files in the cache directory. This loop has two purposes:
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//
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// 1. Removing files that are older than the expiration date.
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// 2. Storing file attributes for the size-based cleanup pass.
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NSMutableArray *urlsToDelete = [[NSMutableArray alloc] init];
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for (NSURL *fileURL in fileEnumerator) {
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NSDictionary *resourceValues = [fileURL resourceValuesForKeys:resourceKeys error:NULL];
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// Skip directories.
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if ([resourceValues[NSURLIsDirectoryKey] boolValue]) {
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continue;
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}
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// Remove files that are older than the expiration date;
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NSDate *modificationDate = resourceValues[NSURLContentModificationDateKey];
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if ([[modificationDate laterDate:expirationDate] isEqualToDate:expirationDate]) {
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[urlsToDelete addObject:fileURL];
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continue;
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}
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// Store a reference to this file and account for its total size.
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NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
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currentCacheSize += [totalAllocatedSize unsignedIntegerValue];
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[cacheFiles setObject:resourceValues forKey:fileURL];
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}
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for (NSURL *fileURL in urlsToDelete) {
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[_fileManager removeItemAtURL:fileURL error:nil];
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}
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// If our remaining disk cache exceeds a configured maximum size, perform a second
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// size-based cleanup pass. We delete the oldest files first.
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if (self.maxCacheSize > 0 && currentCacheSize > self.maxCacheSize) {
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// Target half of our maximum cache size for this cleanup pass.
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const NSUInteger desiredCacheSize = self.maxCacheSize / 2;
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// Sort the remaining cache files by their last modification time (oldest first).
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NSArray *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
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usingComparator:^NSComparisonResult(id obj1, id obj2) {
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return [obj1[NSURLContentModificationDateKey] compare:obj2[NSURLContentModificationDateKey]];
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}];
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// Delete files until we fall below our desired cache size.
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for (NSURL *fileURL in sortedFiles) {
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if ([_fileManager removeItemAtURL:fileURL error:nil]) {
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NSDictionary *resourceValues = cacheFiles[fileURL];
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NSNumber *totalAllocatedSize = resourceValues[NSURLTotalFileAllocatedSizeKey];
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currentCacheSize -= [totalAllocatedSize unsignedIntegerValue];
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if (currentCacheSize < desiredCacheSize) {
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break;
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}
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}
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}
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}
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if (completionBlock) {
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dispatch_async(dispatch_get_main_queue(), ^{
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completionBlock();
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});
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}
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});
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}
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- (void)backgroundCleanDisk {
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Class UIApplicationClass = NSClassFromString(@"UIApplication");
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if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
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return;
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}
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UIApplication *application = [UIApplication performSelector:@selector(sharedApplication)];
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__block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithExpirationHandler:^{
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// Clean up any unfinished task business by marking where you
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// stopped or ending the task outright.
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[application endBackgroundTask:bgTask];
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bgTask = UIBackgroundTaskInvalid;
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}];
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// Start the long-running task and return immediately.
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[self cleanDiskWithCompletionBlock:^{
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[application endBackgroundTask:bgTask];
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bgTask = UIBackgroundTaskInvalid;
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}];
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}
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- (NSUInteger)getSize {
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__block NSUInteger size = 0;
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dispatch_sync(self.ioQueue, ^{
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NSDirectoryEnumerator *fileEnumerator = [_fileManager enumeratorAtPath:self.diskCachePath];
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for (NSString *fileName in fileEnumerator) {
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NSString *filePath = [self.diskCachePath stringByAppendingPathComponent:fileName];
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NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];
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size += [attrs fileSize];
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}
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});
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return size;
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}
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- (NSUInteger)getDiskCount {
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__block NSUInteger count = 0;
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dispatch_sync(self.ioQueue, ^{
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NSDirectoryEnumerator *fileEnumerator = [_fileManager enumeratorAtPath:self.diskCachePath];
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count = [[fileEnumerator allObjects] count];
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});
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return count;
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}
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- (void)calculateSizeWithCompletionBlock:(SDWebImageCalculateSizeBlock)completionBlock {
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NSURL *diskCacheURL = [NSURL fileURLWithPath:self.diskCachePath isDirectory:YES];
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dispatch_async(self.ioQueue, ^{
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NSUInteger fileCount = 0;
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NSUInteger totalSize = 0;
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NSDirectoryEnumerator *fileEnumerator = [_fileManager enumeratorAtURL:diskCacheURL
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includingPropertiesForKeys:@[NSFileSize]
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options:NSDirectoryEnumerationSkipsHiddenFiles
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errorHandler:NULL];
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for (NSURL *fileURL in fileEnumerator) {
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NSNumber *fileSize;
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[fileURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:NULL];
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totalSize += [fileSize unsignedIntegerValue];
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fileCount += 1;
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}
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if (completionBlock) {
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dispatch_async(dispatch_get_main_queue(), ^{
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completionBlock(fileCount, totalSize);
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});
|
}
|
});
|
}
|
|
@end
|
