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58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/*
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* (c) Copyright 2021 by Einar Saukas. All rights reserved.
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*
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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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* * The name of its author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING 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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#define INITIAL_OFFSET 1
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#define FALSE 0
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#define TRUE 1
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#define ZX0_SKIP_NONE 0
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#define ZX0_BACKWARD_OFF FALSE
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#define ZX0_INVERT_MODE_ON TRUE
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#define ZX0_CLASSIC_MODE_OFF FALSE
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#define ZX0_MAX_OFFSET 32640
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#define ZX7_MAX_OFFSET 2176
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typedef struct block_t {
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struct block_t *chain;
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struct block_t *ghost_chain;
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int bits;
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int index;
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int offset;
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int references;
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} BLOCK;
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BLOCK *allocate(int bits, int index, int offset, BLOCK *chain);
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void assign(BLOCK **ptr, BLOCK *chain);
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BLOCK *zx0optimize(unsigned char *input_data, int input_size, int skip, int offset_limit);
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// Decompression
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unsigned char *zx0compress(BLOCK *optimal, unsigned char *input_data, int input_size, int skip, int backwards_mode, int invert_mode, int *output_size, int *delta);
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int zx0decompress(char * filename_in, char * filename_out);
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