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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 |