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2 | daniel-mar | 1 | /** |
2 | * LZW Decoder for Imagination Pilots Entertainment 16-bit games (IPE16) |
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3 | * - Blown Away - The Interactive Game by Imagination Pilots (BA) |
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4 | * - Panic in the Park - The Interactive Game by Imagination Pilots (PiP) |
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5 | * - Where's Waldo? At the Circus (Waldo1) |
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6 | * ART file packer and unpacker by Daniel Marschall, ViaThinkSoft (C) 2014-2018 |
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7 | * Revision: 2018-02-15 |
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8 | * |
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9 | * The code is based on "Cross platform GIF source code" (c) L. Patrick |
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10 | * http://www.cs.usyd.edu.au/~graphapp/package/src/libgif/gif.c |
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11 | * It was simplified and modified to encode IPE16-LZW instead of GIF-LZW. |
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12 | * The game uses exactly the compressed stream as defined in the GIF standard, |
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13 | * but the compressed stream is not divided into chunks. |
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14 | **/ |
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15 | |||
16 | #ifndef __inc__ipe16_lzw_decoder |
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17 | #define __inc__ipe16_lzw_decoder |
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18 | |||
19 | #include <stdio.h> |
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20 | #include <stdbool.h> |
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21 | |||
22 | #define LZ_MIN_BITS 9 |
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23 | #define LZ_MAX_BITS 12 |
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24 | |||
25 | #define LZ_MAX_CODE 4095 /* Largest 12 bit code */ |
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26 | #define NO_SUCH_CODE 4098 /* Impossible code = empty */ |
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27 | |||
28 | #define CLEAR_CODE 256 |
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29 | #define END_CODE 257 |
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30 | #define FIRST_CODE 258 |
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31 | |||
32 | typedef struct tagIpe16LZWDecoder { |
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33 | int running_code; |
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34 | int running_bits; |
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35 | int max_code_plus_one; |
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36 | int shift_state; |
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37 | unsigned long shift_data; |
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38 | unsigned char stack[LZ_MAX_CODE+1]; |
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39 | unsigned int suffix[LZ_MAX_CODE+1]; |
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40 | unsigned int prefix[LZ_MAX_CODE+1]; |
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41 | } Ipe16LZWDecoder; |
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42 | |||
43 | Ipe16LZWDecoder* new_ipe16lzw_decoder(void); |
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44 | void del_ipe16lzw_decoder(Ipe16LZWDecoder* decoder); |
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45 | /*unsigned*/ int ipe16lzw_decode(FILE* outFile, Ipe16LZWDecoder *decoder, unsigned char *input, int inputLength); |
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46 | |||
47 | #endif // #ifndef __inc__ipe16_lzw_decoder |
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48 |