mirror of
https://github.com/MacPaw/XADMaster.git
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102 lines
2.7 KiB
Objective-C
102 lines
2.7 KiB
Objective-C
/*
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* XADWinZipJPEGHandle.m
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#import "XADWinZipJPEGHandle.h"
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#import "XADException.h"
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@implementation XADWinZipJPEGHandle
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length
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{
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if((self=[super initWithInputBufferForHandle:handle length:length]))
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{
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decompressor=NULL;
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}
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return self;
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}
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-(void)dealloc
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{
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FreeWinZipJPEGDecompressor(decompressor);
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[super dealloc];
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}
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static size_t ReadFunction(void *context,uint8_t *buffer,size_t length)
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{
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CSInputBuffer *input=(CSInputBuffer *)context;
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for(int i=0;i<length;i++)
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{
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if(CSInputAtEOF(input)) return i;
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buffer[i]=CSInputNextByte(input);
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}
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return length;
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}
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-(void)resetBlockStream
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{
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if(decompressor) FreeWinZipJPEGDecompressor(decompressor);
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decompressor=AllocWinZipJPEGDecompressor(ReadFunction,input);
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if(!decompressor) [XADException raiseExceptionWithXADError:XADOutOfMemoryError];
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int error=ReadWinZipJPEGHeader(decompressor);
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if(error)
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{
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fprintf(stderr,"Error %d while trying to read WinZip JPEG header.\n",error);
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[XADException raiseIllegalDataException];
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}
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}
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-(int)produceBlockAtOffset:(off_t)pos
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{
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if(!AreMoreWinZipJPEGBytesAvailable(decompressor))
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{
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if(!AreMoreWinZipJPEGSlicesAvailable(decompressor))
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{
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int error=ReadNextWinZipJPEGBundle(decompressor);
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if(error)
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{
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fprintf(stderr,"Error %d while trying to read next WinZip JPEG bundle.\n",error);
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[XADException raiseIllegalDataException];
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}
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if(IsFinalWinZipJPEGBundle(decompressor)) [self endBlockStream];
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[self setBlockPointer:WinZipJPEGBundleMetadataBytes(decompressor)];
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return WinZipJPEGBundleMetadataLength(decompressor);
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}
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int error=ReadNextWinZipJPEGSlice(decompressor);
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if(error)
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{
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fprintf(stderr,"Error %d while trying to read next WinZip JPEG slice.\n",error);
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[XADException raiseExceptionWithXADError:XADInputError];
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}
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}
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size_t actual=EncodeWinZipJPEGBlocksToBuffer(decompressor,buffer,sizeof(buffer));
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[self setBlockPointer:buffer];
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return actual;
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}
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@end
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