mirror of
https://github.com/aaru-dps/Aaru.Compression.Native.git
synced 2026-04-24 06:52:19 +00:00
Natalia Portillo
12a4d684f5
- Implement Deflate64 decompression in zip/deflate64.h and zip/deflate64.c. - Add ZIP Implode decompression functionality in zip/implode.h and zip/implode.c. - Introduce ZIP Reduce decompression in zip/reduce.h and zip/reduce.c. - Implement ZIP Shrink decompression in zip/shrink.h and zip/shrink.c. - Create a unified ZIP interface in zip/zip.h and zip/zip.c to handle multiple compression methods including PPMd, WavPack, and WinZip JPEG. - Ensure all new functions adhere to the Aaru Data Preservation Suite licensing and documentation standards.
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*
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* ArithmeticDecoder.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_ARITHMETIC_DECODER_H__
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#define __WINZIP_JPEG_ARITHMETIC_DECODER_H__
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#include "InputStream.h"
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#include <stdbool.h>
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#include <stdint.h>
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typedef struct WinZipJPEGArithmeticDecoder
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{
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WinZipJPEGReadFunction *readfunc;
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void *inputcontext;
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bool eof;
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uint8_t currbyte, lastbyte;
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uint8_t kmin2; // LPS count for reduction of Q by 4
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uint8_t kmin1; // LPS count for reduction of Q by 2
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uint8_t kmin; // largest LSP[sic] count for smaller Q
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// uint8_t kavg; // expected average LPS count
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uint8_t kmax; // smallest LPS count for larger Q
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uint32_t x; // finite pricesion window on code stream
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int32_t lp; // minus log p --- used only for testing
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int32_t lr; // minus log of the range
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int32_t lrm; // maximum lr before change index
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int32_t lx; // decoder - log x
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uint32_t dx; // antilog of lr -- used only for testing
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} WinZipJPEGArithmeticDecoder;
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typedef struct WinZipJPEGContext
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{
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int i;
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int32_t dlrm; // difference between lrm and lr
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uint8_t mps; // most probable symbol value - 0 or 1
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uint8_t k; // least probable symbol count
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} WinZipJPEGContext;
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void InitializeWinZipJPEGArithmeticDecoder(WinZipJPEGArithmeticDecoder *self, WinZipJPEGReadFunction *readfunc,
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void *inputcontext);
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void InitializeWinZipJPEGContext(WinZipJPEGContext *self);
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void InitializeWinZipJPEGContexts(WinZipJPEGContext *first, size_t bytes);
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void InitializeFixedWinZipJPEGContext(WinZipJPEGContext *self);
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int NextBitFromWinZipJPEGArithmeticDecoder(WinZipJPEGArithmeticDecoder *self, WinZipJPEGContext *context);
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void FlushWinZipJPEGArithmeticDecoder(WinZipJPEGArithmeticDecoder *self);
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static inline bool WinZipJPEGArithmeticDecoderEncounteredEOF(WinZipJPEGArithmeticDecoder *self) { return self->eof; }
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#endif
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