mirror of
https://github.com/aaru-dps/Aaru.Compression.Native.git
synced 2026-04-23 06:22:15 +00:00
Natalia Portillo
ba39191e07
- Implemented range coder in `rangecoder.c` and `rangecoder.h` for efficient encoding/decoding. - Added RLE90 decoding in `rle90.c` for handling StuffIt method 1. - Introduced `stuffit.h` and `stuffit_internal.h` to define compression methods and internal structures. - Implemented x86 address transformation in `x86.c` for StuffIt X preprocessing. - Updated CMakeLists to include new test data files for various StuffIt methods. - Created comprehensive tests in `stuffit.cpp` for validating decompression of multiple StuffIt formats. - Added binary test data for StuffIt methods including compress, method 13, arsenic, and StuffIt X variants.
48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2026 Natalia Portillo.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* 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, but
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* 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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef AARU_STUFFIT_RANGECODER_H
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#define AARU_STUFFIT_RANGECODER_H
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef struct StuffitRangeCoder
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{
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const uint8_t *data;
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size_t data_len;
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size_t pos;
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uint32_t low, code, range, bottom;
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bool use_low;
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} StuffitRangeCoder;
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void stuffit_rc_init(StuffitRangeCoder *self, const uint8_t *data, size_t data_len, size_t *pos, bool use_low,
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uint32_t bottom);
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uint32_t stuffit_rc_current_count(StuffitRangeCoder *self, uint32_t scale);
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void stuffit_rc_remove_subrange(StuffitRangeCoder *self, uint32_t lowcount, uint32_t highcount);
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void stuffit_rc_normalize(StuffitRangeCoder *self);
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int stuffit_rc_next_symbol(StuffitRangeCoder *self, uint32_t *freqtable, int numfreq);
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int stuffit_rc_next_bit(StuffitRangeCoder *self);
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int stuffit_rc_next_weighted_bit(StuffitRangeCoder *self, int weight, int size);
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int stuffit_rc_next_weighted_bit2(StuffitRangeCoder *self, int weight, int shift);
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#endif /* AARU_STUFFIT_RANGECODER_H */
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