mirror of
https://github.com/samsonjs/arq_restore.git
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118 lines
4.2 KiB
Objective-C
118 lines
4.2 KiB
Objective-C
/*
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Copyright (c) 2009-2017, Haystack Software LLC https://www.arqbackup.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of PhotoMinds LLC or Haystack Software, nor the names of
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their contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "lz4.h"
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#import "LZ4Compressor.h"
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@implementation LZ4Compressor
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CWL_SYNTHESIZE_SINGLETON_FOR_CLASS(LZ4Compressor)
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- (id)init {
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if (self = [super init]) {
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lock = [[NSLock alloc] init];
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[lock setName:@"LZ4Compressor lock"];
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}
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return self;
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}
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- (NSString *)errorDomain {
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return @"LZ4ErrorDomain";
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}
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- (NSData *)lz4Deflate:(NSData *)data error:(NSError **)error {
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[lock lock];
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NSData *ret = [self lockedLZ4Deflate:data error:error];
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[lock unlock];
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return ret;
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}
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- (NSData *)lz4Inflate:(NSData *)data error:(NSError **)error {
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[lock lock];
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NSData *ret = [self lockedLZ4Inflate:data error:error];
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[lock unlock];
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return ret;
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}
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- (NSData *)lockedLZ4Deflate:(NSData *)data error:(NSError **)error {
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if ([data length] > (NSUInteger)INT_MAX) {
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SETNSERROR([self errorDomain], -1, @"length larger than INT_MAX");
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return nil;
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}
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int originalSize = (int)[data length];
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if (originalSize == 0) {
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return [NSData data];
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}
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int destSize = LZ4_compressBound((int)[data length]);
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int outBufSize = destSize + 4;
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char *outBuf = (char *)malloc(outBufSize);
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int compressed = LZ4_compress_default([data bytes], outBuf + 4, (int)[data length], destSize);
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if (compressed == 0) {
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SETNSERROR([self errorDomain], -1, @"LZ4_compress_default failed");
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free(outBuf);
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return nil;
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}
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uint32_t nboSize = OSSwapHostToBigInt32(originalSize);
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memcpy(outBuf, &nboSize, 4);
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return [NSData dataWithBytesNoCopy:outBuf length:(compressed + 4) freeWhenDone:YES];
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}
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- (NSData *)lockedLZ4Inflate:(NSData *)data error:(NSError **)error {
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int length = (int)[data length];
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if (length < 5) {
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SETNSERROR([self errorDomain], -1, @"not enough bytes for an lz4-compressed buffer");
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return nil;
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}
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char *src = (char *)[data bytes];
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uint32_t nboSize = 0;
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memcpy(&nboSize, src, 4);
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int originalSize = OSSwapBigToHostInt32(nboSize);
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if (originalSize < 0) {
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SETNSERROR([self errorDomain], -1, @"invalid size for LZ4-compressed %d-byte data chunk: %d", length, originalSize);
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return nil;
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}
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char *buf = (char *)malloc(originalSize);
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int compressedSize = length - 4;
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int decompressedLen = LZ4_decompress_safe(src + 4, buf, compressedSize, originalSize);
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if (decompressedLen != originalSize) {
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HSLogError(@"LZ4_decompress error: returned %d (expected %d)", decompressedLen, originalSize);
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SETNSERROR([self errorDomain], -1, @"LZ4_decompress failed");
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return nil;
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}
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return [[[NSData alloc] initWithBytesNoCopy:buf length:originalSize freeWhenDone:YES] autorelease];
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}
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@end
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