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Pods/AliyunOSSiOS/AliyunOSSSDK/OSSInputStreamHelper.m

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+//
+//  OSSInputStreamHelper.m
+//  AliyunOSSSDK
+//
+//  Created by 怀叙 on 2017/12/7.
+//  Copyright © 2017年 阿里云. All rights reserved.
+//
+
+#import "OSSInputStreamHelper.h"
+#import "OSSLog.h"
+#import "aos_crc64.h"
+
+@interface OSSInputStreamHelper ()
+{
+    NSInputStream *_inputStream;
+    CFAbsoluteTime _startTime;
+    dispatch_semaphore_t _semaphore;
+}
+
+@end
+
+@implementation OSSInputStreamHelper
+
+- (instancetype)initWithFileAtPath:(nonnull NSString *)path
+{
+    self = [super init];
+    if (self) {
+        _crc64 = 0;
+        _inputStream = [NSInputStream inputStreamWithFileAtPath:path];
+        _semaphore = dispatch_semaphore_create(1);
+    }
+    return self;
+}
+
+- (instancetype)initWithURL:(nonnull NSURL *)URL
+{
+    self = [super init];
+    if (self) {
+        _crc64 = 0;
+        _inputStream = [NSInputStream inputStreamWithURL:URL];
+        _semaphore = dispatch_semaphore_create(1);
+    }
+    return self;
+}
+
+- (void)syncReadBuffers
+{
+    dispatch_semaphore_wait(_semaphore, DISPATCH_TIME_FOREVER);
+
+    _startTime = CFAbsoluteTimeGetCurrent();
+    [_inputStream open];
+    NSInteger length = 1;
+    while (length > 0)
+    {
+        @autoreleasepool{
+            uint8_t streamData[1024 * 4];
+            length = [_inputStream read:streamData maxLength:1024 * 4];
+            if (length > 0) {
+                _crc64 = aos_crc64(_crc64, streamData, length);
+            }
+        }
+    }
+    
+    if (length < 0) {
+        OSSLogError(@"there is an error when reading buffer from file!");
+    }
+    [_inputStream close];
+    
+    CFAbsoluteTime duration =  CFAbsoluteTimeGetCurrent() - _startTime;
+    OSSLogDebug(@"read file cost time is :%f",duration);
+    
+    dispatch_semaphore_signal(_semaphore);
+}
+
+- (uint64_t)crc64
+{
+    return _crc64;
+}
+
+@end