From 3e8437ae559487362fae3525beb79c534c213a51 Mon Sep 17 00:00:00 2001
From: 单军华
Date: Thu, 12 Jul 2018 13:44:34 +0800
Subject: [PATCH] bug修复和功能优化
---
screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.m | 516 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 516 insertions(+), 0 deletions(-)
diff --git a/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.m b/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.m
new file mode 100644
index 0000000..722645f
--- /dev/null
+++ b/screendisplay/Pods/SDWebImage/SDWebImage/SDWebImageDownloaderOperation.m
@@ -0,0 +1,516 @@
+/*
+ * This file is part of the SDWebImage package.
+ * (c) Olivier Poitrey <rs@dailymotion.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#import "SDWebImageDownloaderOperation.h"
+#import "SDWebImageManager.h"
+#import "NSImage+WebCache.h"
+#import "SDWebImageCodersManager.h"
+
+#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
+#define UNLOCK(lock) dispatch_semaphore_signal(lock);
+
+// iOS 8 Foundation.framework extern these symbol but the define is in CFNetwork.framework. We just fix this without import CFNetwork.framework
+#if (__IPHONE_OS_VERSION_MIN_REQUIRED && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+const float NSURLSessionTaskPriorityHigh = 0.75;
+const float NSURLSessionTaskPriorityDefault = 0.5;
+const float NSURLSessionTaskPriorityLow = 0.25;
+#endif
+
+NSString *const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
+NSString *const SDWebImageDownloadReceiveResponseNotification = @"SDWebImageDownloadReceiveResponseNotification";
+NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";
+NSString *const SDWebImageDownloadFinishNotification = @"SDWebImageDownloadFinishNotification";
+
+static NSString *const kProgressCallbackKey = @"progress";
+static NSString *const kCompletedCallbackKey = @"completed";
+
+typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
+
+@interface SDWebImageDownloaderOperation ()
+
+@property (strong, nonatomic, nonnull) NSMutableArray<SDCallbacksDictionary *> *callbackBlocks;
+
+@property (assign, nonatomic, getter = isExecuting) BOOL executing;
+@property (assign, nonatomic, getter = isFinished) BOOL finished;
+@property (strong, nonatomic, nullable) NSMutableData *imageData;
+@property (copy, nonatomic, nullable) NSData *cachedData; // for `SDWebImageDownloaderIgnoreCachedResponse`
+
+// This is weak because it is injected by whoever manages this session. If this gets nil-ed out, we won't be able to run
+// the task associated with this operation
+@property (weak, nonatomic, nullable) NSURLSession *unownedSession;
+// This is set if we're using not using an injected NSURLSession. We're responsible of invalidating this one
+@property (strong, nonatomic, nullable) NSURLSession *ownedSession;
+
+@property (strong, nonatomic, readwrite, nullable) NSURLSessionTask *dataTask;
+
+@property (strong, nonatomic, nonnull) dispatch_semaphore_t callbacksLock; // a lock to keep the access to `callbackBlocks` thread-safe
+
+@property (strong, nonatomic, nonnull) dispatch_queue_t coderQueue; // the queue to do image decoding
+#if SD_UIKIT
+@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundTaskId;
+#endif
+
+@property (strong, nonatomic, nullable) id<SDWebImageProgressiveCoder> progressiveCoder;
+
+@end
+
+@implementation SDWebImageDownloaderOperation
+
+@synthesize executing = _executing;
+@synthesize finished = _finished;
+
+- (nonnull instancetype)init {
+ return [self initWithRequest:nil inSession:nil options:0];
+}
+
+- (nonnull instancetype)initWithRequest:(nullable NSURLRequest *)request
+ inSession:(nullable NSURLSession *)session
+ options:(SDWebImageDownloaderOptions)options {
+ if ((self = [super init])) {
+ _request = [request copy];
+ _shouldDecompressImages = YES;
+ _options = options;
+ _callbackBlocks = [NSMutableArray new];
+ _executing = NO;
+ _finished = NO;
+ _expectedSize = 0;
+ _unownedSession = session;
+ _callbacksLock = dispatch_semaphore_create(1);
+ _coderQueue = dispatch_queue_create("com.hackemist.SDWebImageDownloaderOperationCoderQueue", DISPATCH_QUEUE_SERIAL);
+ }
+ return self;
+}
+
+- (nullable id)addHandlersForProgress:(nullable SDWebImageDownloaderProgressBlock)progressBlock
+ completed:(nullable SDWebImageDownloaderCompletedBlock)completedBlock {
+ SDCallbacksDictionary *callbacks = [NSMutableDictionary new];
+ if (progressBlock) callbacks[kProgressCallbackKey] = [progressBlock copy];
+ if (completedBlock) callbacks[kCompletedCallbackKey] = [completedBlock copy];
+ LOCK(self.callbacksLock);
+ [self.callbackBlocks addObject:callbacks];
+ UNLOCK(self.callbacksLock);
+ return callbacks;
+}
+
+- (nullable NSArray<id> *)callbacksForKey:(NSString *)key {
+ LOCK(self.callbacksLock);
+ NSMutableArray<id> *callbacks = [[self.callbackBlocks valueForKey:key] mutableCopy];
+ UNLOCK(self.callbacksLock);
+ // We need to remove [NSNull null] because there might not always be a progress block for each callback
+ [callbacks removeObjectIdenticalTo:[NSNull null]];
+ return [callbacks copy]; // strip mutability here
+}
+
+- (BOOL)cancel:(nullable id)token {
+ BOOL shouldCancel = NO;
+ LOCK(self.callbacksLock);
+ [self.callbackBlocks removeObjectIdenticalTo:token];
+ if (self.callbackBlocks.count == 0) {
+ shouldCancel = YES;
+ }
+ UNLOCK(self.callbacksLock);
+ if (shouldCancel) {
+ [self cancel];
+ }
+ return shouldCancel;
+}
+
+- (void)start {
+ @synchronized (self) {
+ if (self.isCancelled) {
+ self.finished = YES;
+ [self reset];
+ return;
+ }
+
+#if SD_UIKIT
+ Class UIApplicationClass = NSClassFromString(@"UIApplication");
+ BOOL hasApplication = UIApplicationClass && [UIApplicationClass respondsToSelector:@selector(sharedApplication)];
+ if (hasApplication && [self shouldContinueWhenAppEntersBackground]) {
+ __weak __typeof__ (self) wself = self;
+ UIApplication * app = [UIApplicationClass performSelector:@selector(sharedApplication)];
+ self.backgroundTaskId = [app beginBackgroundTaskWithExpirationHandler:^{
+ __strong __typeof (wself) sself = wself;
+
+ if (sself) {
+ [sself cancel];
+
+ [app endBackgroundTask:sself.backgroundTaskId];
+ sself.backgroundTaskId = UIBackgroundTaskInvalid;
+ }
+ }];
+ }
+#endif
+ NSURLSession *session = self.unownedSession;
+ if (!session) {
+ NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
+ sessionConfig.timeoutIntervalForRequest = 15;
+
+ /**
+ * Create the session for this task
+ * We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
+ * method calls and completion handler calls.
+ */
+ session = [NSURLSession sessionWithConfiguration:sessionConfig
+ delegate:self
+ delegateQueue:nil];
+ self.ownedSession = session;
+ }
+
+ if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
+ // Grab the cached data for later check
+ NSURLCache *URLCache = session.configuration.URLCache;
+ if (!URLCache) {
+ URLCache = [NSURLCache sharedURLCache];
+ }
+ NSCachedURLResponse *cachedResponse;
+ // NSURLCache's `cachedResponseForRequest:` is not thread-safe, see https://developer.apple.com/documentation/foundation/nsurlcache#2317483
+ @synchronized (URLCache) {
+ cachedResponse = [URLCache cachedResponseForRequest:self.request];
+ }
+ if (cachedResponse) {
+ self.cachedData = cachedResponse.data;
+ }
+ }
+
+ self.dataTask = [session dataTaskWithRequest:self.request];
+ self.executing = YES;
+ }
+
+ if (self.dataTask) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability"
+ if ([self.dataTask respondsToSelector:@selector(setPriority:)]) {
+ if (self.options & SDWebImageDownloaderHighPriority) {
+ self.dataTask.priority = NSURLSessionTaskPriorityHigh;
+ } else if (self.options & SDWebImageDownloaderLowPriority) {
+ self.dataTask.priority = NSURLSessionTaskPriorityLow;
+ }
+ }
+#pragma clang diagnostic pop
+ [self.dataTask resume];
+ for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+ progressBlock(0, NSURLResponseUnknownLength, self.request.URL);
+ }
+ __weak typeof(self) weakSelf = self;
+ dispatch_async(dispatch_get_main_queue(), ^{
+ [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:weakSelf];
+ });
+ } else {
+ [self callCompletionBlocksWithError:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorUnknown userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
+ [self done];
+ return;
+ }
+
+#if SD_UIKIT
+ Class UIApplicationClass = NSClassFromString(@"UIApplication");
+ if(!UIApplicationClass || ![UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
+ return;
+ }
+ if (self.backgroundTaskId != UIBackgroundTaskInvalid) {
+ UIApplication * app = [UIApplication performSelector:@selector(sharedApplication)];
+ [app endBackgroundTask:self.backgroundTaskId];
+ self.backgroundTaskId = UIBackgroundTaskInvalid;
+ }
+#endif
+}
+
+- (void)cancel {
+ @synchronized (self) {
+ [self cancelInternal];
+ }
+}
+
+- (void)cancelInternal {
+ if (self.isFinished) return;
+ [super cancel];
+
+ if (self.dataTask) {
+ [self.dataTask cancel];
+ __weak typeof(self) weakSelf = self;
+ dispatch_async(dispatch_get_main_queue(), ^{
+ [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
+ });
+
+ // As we cancelled the task, its callback won't be called and thus won't
+ // maintain the isFinished and isExecuting flags.
+ if (self.isExecuting) self.executing = NO;
+ if (!self.isFinished) self.finished = YES;
+ }
+
+ [self reset];
+}
+
+- (void)done {
+ self.finished = YES;
+ self.executing = NO;
+ [self reset];
+}
+
+- (void)reset {
+ LOCK(self.callbacksLock);
+ [self.callbackBlocks removeAllObjects];
+ UNLOCK(self.callbacksLock);
+ self.dataTask = nil;
+
+ if (self.ownedSession) {
+ [self.ownedSession invalidateAndCancel];
+ self.ownedSession = nil;
+ }
+}
+
+- (void)setFinished:(BOOL)finished {
+ [self willChangeValueForKey:@"isFinished"];
+ _finished = finished;
+ [self didChangeValueForKey:@"isFinished"];
+}
+
+- (void)setExecuting:(BOOL)executing {
+ [self willChangeValueForKey:@"isExecuting"];
+ _executing = executing;
+ [self didChangeValueForKey:@"isExecuting"];
+}
+
+- (BOOL)isConcurrent {
+ return YES;
+}
+
+#pragma mark NSURLSessionDataDelegate
+
+- (void)URLSession:(NSURLSession *)session
+ dataTask:(NSURLSessionDataTask *)dataTask
+didReceiveResponse:(NSURLResponse *)response
+ completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
+ NSURLSessionResponseDisposition disposition = NSURLSessionResponseAllow;
+ NSInteger expected = (NSInteger)response.expectedContentLength;
+ expected = expected > 0 ? expected : 0;
+ self.expectedSize = expected;
+ self.response = response;
+ NSInteger statusCode = [response respondsToSelector:@selector(statusCode)] ? ((NSHTTPURLResponse *)response).statusCode : 200;
+ BOOL valid = statusCode < 400;
+ //'304 Not Modified' is an exceptional one. It should be treated as cancelled if no cache data
+ //URLSession current behavior will return 200 status code when the server respond 304 and URLCache hit. But this is not a standard behavior and we just add a check
+ if (statusCode == 304 && !self.cachedData) {
+ valid = NO;
+ }
+
+ if (valid) {
+ for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+ progressBlock(0, expected, self.request.URL);
+ }
+ } else {
+ // Status code invalid and marked as cancelled. Do not call `[self.dataTask cancel]` which may mass up URLSession life cycle
+ disposition = NSURLSessionResponseCancel;
+ }
+
+ __weak typeof(self) weakSelf = self;
+ dispatch_async(dispatch_get_main_queue(), ^{
+ [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadReceiveResponseNotification object:weakSelf];
+ });
+
+ if (completionHandler) {
+ completionHandler(disposition);
+ }
+}
+
+- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
+ if (!self.imageData) {
+ self.imageData = [[NSMutableData alloc] initWithCapacity:self.expectedSize];
+ }
+ [self.imageData appendData:data];
+
+ if ((self.options & SDWebImageDownloaderProgressiveDownload) && self.expectedSize > 0) {
+ // Get the image data
+ __block NSData *imageData = [self.imageData copy];
+ // Get the total bytes downloaded
+ const NSInteger totalSize = imageData.length;
+ // Get the finish status
+ BOOL finished = (totalSize >= self.expectedSize);
+
+ if (!self.progressiveCoder) {
+ // We need to create a new instance for progressive decoding to avoid conflicts
+ for (id<SDWebImageCoder>coder in [SDWebImageCodersManager sharedInstance].coders) {
+ if ([coder conformsToProtocol:@protocol(SDWebImageProgressiveCoder)] &&
+ [((id<SDWebImageProgressiveCoder>)coder) canIncrementallyDecodeFromData:imageData]) {
+ self.progressiveCoder = [[[coder class] alloc] init];
+ break;
+ }
+ }
+ }
+
+ // progressive decode the image in coder queue
+ dispatch_async(self.coderQueue, ^{
+ UIImage *image = [self.progressiveCoder incrementallyDecodedImageWithData:imageData finished:finished];
+ if (image) {
+ NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
+ image = [self scaledImageForKey:key image:image];
+ if (self.shouldDecompressImages) {
+ image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(NO)}];
+ }
+
+ // We do not keep the progressive decoding image even when `finished`=YES. Because they are for view rendering but not take full function from downloader options. And some coders implementation may not keep consistent between progressive decoding and normal decoding.
+
+ [self callCompletionBlocksWithImage:image imageData:nil error:nil finished:NO];
+ }
+ });
+ }
+
+ for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
+ progressBlock(self.imageData.length, self.expectedSize, self.request.URL);
+ }
+}
+
+- (void)URLSession:(NSURLSession *)session
+ dataTask:(NSURLSessionDataTask *)dataTask
+ willCacheResponse:(NSCachedURLResponse *)proposedResponse
+ completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler {
+
+ NSCachedURLResponse *cachedResponse = proposedResponse;
+
+ if (!(self.options & SDWebImageDownloaderUseNSURLCache)) {
+ // Prevents caching of responses
+ cachedResponse = nil;
+ }
+ if (completionHandler) {
+ completionHandler(cachedResponse);
+ }
+}
+
+#pragma mark NSURLSessionTaskDelegate
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
+ @synchronized(self) {
+ self.dataTask = nil;
+ __weak typeof(self) weakSelf = self;
+ dispatch_async(dispatch_get_main_queue(), ^{
+ [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:weakSelf];
+ if (!error) {
+ [[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadFinishNotification object:weakSelf];
+ }
+ });
+ }
+
+ // make sure to call `[self done]` to mark operation as finished
+ if (error) {
+ [self callCompletionBlocksWithError:error];
+ [self done];
+ } else {
+ if ([self callbacksForKey:kCompletedCallbackKey].count > 0) {
+ /**
+ * If you specified to use `NSURLCache`, then the response you get here is what you need.
+ */
+ __block NSData *imageData = [self.imageData copy];
+ if (imageData) {
+ /** if you specified to only use cached data via `SDWebImageDownloaderIgnoreCachedResponse`,
+ * then we should check if the cached data is equal to image data
+ */
+ if (self.options & SDWebImageDownloaderIgnoreCachedResponse && [self.cachedData isEqualToData:imageData]) {
+ // call completion block with nil
+ [self callCompletionBlocksWithImage:nil imageData:nil error:nil finished:YES];
+ [self done];
+ } else {
+ // decode the image in coder queue
+ dispatch_async(self.coderQueue, ^{
+ UIImage *image = [[SDWebImageCodersManager sharedInstance] decodedImageWithData:imageData];
+ NSString *key = [[SDWebImageManager sharedManager] cacheKeyForURL:self.request.URL];
+ image = [self scaledImageForKey:key image:image];
+
+ BOOL shouldDecode = YES;
+ // Do not force decoding animated GIFs and WebPs
+ if (image.images) {
+ shouldDecode = NO;
+ } else {
+#ifdef SD_WEBP
+ SDImageFormat imageFormat = [NSData sd_imageFormatForImageData:imageData];
+ if (imageFormat == SDImageFormatWebP) {
+ shouldDecode = NO;
+ }
+#endif
+ }
+
+ if (shouldDecode) {
+ if (self.shouldDecompressImages) {
+ BOOL shouldScaleDown = self.options & SDWebImageDownloaderScaleDownLargeImages;
+ image = [[SDWebImageCodersManager sharedInstance] decompressedImageWithImage:image data:&imageData options:@{SDWebImageCoderScaleDownLargeImagesKey: @(shouldScaleDown)}];
+ }
+ }
+ CGSize imageSize = image.size;
+ if (imageSize.width == 0 || imageSize.height == 0) {
+ [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Downloaded image has 0 pixels"}]];
+ } else {
+ [self callCompletionBlocksWithImage:image imageData:imageData error:nil finished:YES];
+ }
+ [self done];
+ });
+ }
+ } else {
+ [self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Image data is nil"}]];
+ [self done];
+ }
+ } else {
+ [self done];
+ }
+ }
+}
+
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
+
+ NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+ __block NSURLCredential *credential = nil;
+
+ if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
+ if (!(self.options & SDWebImageDownloaderAllowInvalidSSLCertificates)) {
+ disposition = NSURLSessionAuthChallengePerformDefaultHandling;
+ } else {
+ credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
+ disposition = NSURLSessionAuthChallengeUseCredential;
+ }
+ } else {
+ if (challenge.previousFailureCount == 0) {
+ if (self.credential) {
+ credential = self.credential;
+ disposition = NSURLSessionAuthChallengeUseCredential;
+ } else {
+ disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
+ }
+ } else {
+ disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
+ }
+ }
+
+ if (completionHandler) {
+ completionHandler(disposition, credential);
+ }
+}
+
+#pragma mark Helper methods
+- (nullable UIImage *)scaledImageForKey:(nullable NSString *)key image:(nullable UIImage *)image {
+ return SDScaledImageForKey(key, image);
+}
+
+- (BOOL)shouldContinueWhenAppEntersBackground {
+ return self.options & SDWebImageDownloaderContinueInBackground;
+}
+
+- (void)callCompletionBlocksWithError:(nullable NSError *)error {
+ [self callCompletionBlocksWithImage:nil imageData:nil error:error finished:YES];
+}
+
+- (void)callCompletionBlocksWithImage:(nullable UIImage *)image
+ imageData:(nullable NSData *)imageData
+ error:(nullable NSError *)error
+ finished:(BOOL)finished {
+ NSArray<id> *completionBlocks = [self callbacksForKey:kCompletedCallbackKey];
+ dispatch_main_async_safe(^{
+ for (SDWebImageDownloaderCompletedBlock completedBlock in completionBlocks) {
+ completedBlock(image, imageData, error, finished);
+ }
+ });
+}
+
+@end
--
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