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101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/*
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* Decompressor.h
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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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#ifndef __WINZIP_JPEG_DECOMPRESSOR_H__
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#define __WINZIP_JPEG_DECOMPRESSOR_H__
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#include "InputStream.h"
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#include "ArithmeticDecoder.h"
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#include "JPEG.h"
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#include <stdint.h>
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#include <stdbool.h>
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#define WinZipJPEGNoError 0
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#define WinZipJPEGEndOfStreamError 1
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#define WinZipJPEGOutOfMemoryError 2
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#define WinZipJPEGInvalidHeaderError 3
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#define WinZipJPEGLZMAError 4
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#define WinZipJPEGParseError 5
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typedef struct WinZipJPEGDecompressor
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{
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WinZipJPEGReadFunction *readfunc;
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void *inputcontext;
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uint32_t metadatalength;
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uint8_t *metadatabytes;
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bool isfirstbundle,reachedend;
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WinZipJPEGMetadata jpeg;
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bool slicesavailable;
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unsigned int slicevalue,sliceheight;
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unsigned int currheight,finishedrows;
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int predicted[4];
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uint64_t bitstring;
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unsigned int bitlength;
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bool needsstuffing;
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WinZipJPEGArithmeticDecoder decoder;
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WinZipJPEGContext eobbins[4][13][63]; // 321 in WinZip.
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WinZipJPEGContext zerobins[4][62][3][6]; // 1140 in WinZip.
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WinZipJPEGContext pivotbins[4][63][5][7]; // 2256 in WinZip.
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WinZipJPEGContext acmagnitudebins[4][3][9][9][9];
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WinZipJPEGContext acremainderbins[4][3][7][13];
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WinZipJPEGContext acsignbins[4][27][3][2];
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WinZipJPEGContext dcmagnitudebins[4][13][10]; // 1 in WinZip.
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WinZipJPEGContext dcremainderbins[4][13][14]; // 131 in WinZip.
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WinZipJPEGContext dcsignbins[4][2][2][2]; // 313 in WinZip.
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WinZipJPEGContext fixedcontext; // 0 in WinZip.
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WinZipJPEGBlock *blocks[4];
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WinZipJPEGBlock *currblock;
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bool mcusavailable;
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unsigned int mcurow,mcucol,mcucomp,mcux,mcuy,mcucoeff;
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unsigned int mcucounter,restartmarkerindex;
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bool writerestartmarker;
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} WinZipJPEGDecompressor;
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WinZipJPEGDecompressor *AllocWinZipJPEGDecompressor(WinZipJPEGReadFunction *readfunc,void *inputcontext);
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void FreeWinZipJPEGDecompressor(WinZipJPEGDecompressor *self);
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int ReadWinZipJPEGHeader(WinZipJPEGDecompressor *self);
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int ReadNextWinZipJPEGBundle(WinZipJPEGDecompressor *self);
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int ReadNextWinZipJPEGSlice(WinZipJPEGDecompressor *self);
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size_t EncodeWinZipJPEGBlocksToBuffer(WinZipJPEGDecompressor *self,void *bytes,size_t length);
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static inline bool IsFinalWinZipJPEGBundle(WinZipJPEGDecompressor *self)
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{ return self->reachedend; }
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static inline bool AreMoreWinZipJPEGSlicesAvailable(WinZipJPEGDecompressor *self)
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{ return !self->reachedend && self->slicesavailable; }
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static inline bool AreMoreWinZipJPEGBytesAvailable(WinZipJPEGDecompressor *self)
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{ return self->mcusavailable || self->bitlength>=8 || self->needsstuffing || self->writerestartmarker; }
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static inline uint32_t WinZipJPEGBundleMetadataLength(WinZipJPEGDecompressor *self) { return self->metadatalength; }
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static inline uint8_t *WinZipJPEGBundleMetadataBytes(WinZipJPEGDecompressor *self) { return self->metadatabytes; }
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#endif
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