mirror of
https://github.com/samsonjs/arq_restore.git
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96 lines
3.6 KiB
Objective-C
96 lines
3.6 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 "ChunkedInputStream.h"
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#import "SetNSError.h"
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#import "InputStreams.h"
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#import "NSErrorCodes.h"
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#import "BufferedInputStream.h"
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#define MAX_CHUNK_LENGTH_LINE_LENGTH (1024)
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@implementation ChunkedInputStream
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- (id)initWithUnderlyingStream:(BufferedInputStream *)is {
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if (self = [super init]) {
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underlyingStream = [is retain];
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}
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return self;
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}
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- (void)dealloc {
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[underlyingStream release];
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[super dealloc];
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}
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#pragma mark InputStream protocol
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- (NSInteger)read:(unsigned char *)buf bufferLength:(NSUInteger)bufferLength error:(NSError **)error {
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if (received >= chunkLength) {
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received = 0;
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NSString *line = [underlyingStream readLineWithCRLFWithMaxLength:MAX_CHUNK_LENGTH_LINE_LENGTH error:error];
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if (line == nil) {
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return -1;
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}
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NSScanner *scanner = [NSScanner scannerWithString:line];
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unsigned int scanned = 0;
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if (![scanner scanHexInt:&scanned]) {
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SETNSERROR(@"StreamErrorDomain", -1, @"invalid chunk length: %@", line);
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return -1;
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}
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chunkLength = (NSUInteger)scanned;
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HSLogTrace(@"chunk length = %lu", chunkLength);
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}
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if (chunkLength == 0) {
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SETNSERROR(@"StreamsErrorDomain", ERROR_EOF, @"EOF (zero chunk length)");
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return -1;
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}
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NSUInteger remaining = chunkLength - received;
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NSUInteger toRead = remaining > bufferLength ? bufferLength : remaining;
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NSInteger ret = [underlyingStream read:buf bufferLength:toRead error:error];
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if (ret < 0) {
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return -1;
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}
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received += ret;
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if (received >= chunkLength) {
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NSString *line = [underlyingStream readLineWithCRLFWithMaxLength:MAX_CHUNK_LENGTH_LINE_LENGTH error:error];
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if (line == nil) {
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return -1;
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}
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if (![line isEqualToString:@"\r\n"]) {
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SETNSERROR(@"StreamErrorDomain", -1, @"missing CRLF at end of chunk!");
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return -1;
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}
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}
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return ret;
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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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@end
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