46 lines
1.1 KiB
Objective-C
Executable File
46 lines
1.1 KiB
Objective-C
Executable File
//
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// QNCrc.m
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// QiniuSDK
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//
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// Created by bailong on 14-9-29.
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// Copyright (c) 2014年 Qiniu. All rights reserved.
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//
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#import <zlib.h>
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#import "QNConfiguration.h"
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#import "QNCrc32.h"
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@implementation QNCrc32
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+ (UInt32)data:(NSData *)data {
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uLong crc = crc32(0L, Z_NULL, 0);
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crc = crc32(crc, [data bytes], (uInt)[data length]);
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return (UInt32)crc;
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}
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+ (UInt32)file:(NSString *)filePath
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error:(NSError **)error {
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@autoreleasepool {
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NSData *data = [NSData dataWithContentsOfFile:filePath options:NSDataReadingMappedIfSafe error:error];
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if (*error != nil) {
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return 0;
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}
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int len = (int)[data length];
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int count = (len + kQNBlockSize - 1) / kQNBlockSize;
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uLong crc = crc32(0L, Z_NULL, 0);
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for (int i = 0; i < count; i++) {
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int offset = i * kQNBlockSize;
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int size = (len - offset) > kQNBlockSize ? kQNBlockSize : (len - offset);
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NSData *d = [data subdataWithRange:NSMakeRange(offset, (unsigned int)size)];
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crc = crc32(crc, [d bytes], (uInt)[d length]);
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}
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return (UInt32)crc;
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}
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}
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@end
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