mirror of
https://github.com/samsonjs/arq_restore.git
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117 lines
4.1 KiB
Objective-C
117 lines
4.1 KiB
Objective-C
/*
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Copyright (c) 2009-2011, Stefan Reitshamer http://www.haystacksoftware.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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#import "GunzipInputStream.h"
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#import "InputStreams.h"
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#import "SetNSError.h"
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#import "NSErrorCodes.h"
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#define MY_BUF_SIZE (4096)
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@implementation GunzipInputStream
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+ (NSString *)errorDomain {
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return @"GunzipInputStreamErrorDomain";
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}
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- (id)initWithUnderlyingStream:(id <InputStream>)theUnderlyingStream {
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if (self = [super init]) {
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underlyingStream = [theUnderlyingStream retain];
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stream.avail_in = 0;
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stream.avail_out = 0;
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stream.total_out = 0;
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stream.zalloc = Z_NULL;
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stream.zfree = Z_NULL;
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stream.opaque = Z_NULL;
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flush = Z_NO_FLUSH;
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inBuf = (unsigned char *)malloc(MY_BUF_SIZE);
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}
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return self;
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}
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- (void)dealloc {
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if (initialized) {
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inflateEnd(&stream);
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}
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[underlyingStream release];
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free(inBuf);
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[super dealloc];
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}
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#pragma mark InputStream
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- (NSInteger)read:(unsigned char *)theBuf bufferLength:(NSUInteger)theBufferLength error:(NSError **)error {
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NSInteger recvd = 0;
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while (!eof && recvd == 0) {
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BOOL wasInitialized = initialized;
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if (!initialized) {
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int ret = inflateInit2(&stream, 15+32);
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if (ret != Z_OK) {
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SETNSERROR([GunzipInputStream errorDomain], ret, @"inflateInit error %d", ret);
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return -1;
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}
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initialized = YES;
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}
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if (!wasInitialized || stream.avail_out > 0) {
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// There weren't inflated bytes remaining last time, so read in some more before trying to inflate some more.
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stream.next_in = inBuf; // zlib changes next_in pointer so we have to reset it every time.
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stream.avail_in = [underlyingStream read:stream.next_in bufferLength:MY_BUF_SIZE error:error];
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if (stream.avail_in <= 0) {
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return stream.avail_in;
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}
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}
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stream.next_out = theBuf;
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stream.avail_out = theBufferLength;
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int ret = inflate(&stream, flush);
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switch (ret) {
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case Z_NEED_DICT:
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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SETNSERROR([GunzipInputStream errorDomain], ret, @"inflate error %d", ret);
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return -1;
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case Z_STREAM_END:
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eof = YES;
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}
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recvd = theBufferLength - stream.avail_out;
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}
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return recvd;
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}
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- (NSData *)slurp:(NSError **)error {
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return [InputStreams slurp:self error:error];
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}
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#pragma mark NSObject
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- (NSString *)description {
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return [NSString stringWithFormat:@"<GunzipInputStream %@>", underlyingStream];
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}
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@end
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