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| /** |
| * LZW Encoder for Imagination Pilots Entertainment 16-bit games (IPE16) |
| * - Blown Away - The Interactive Game by Imagination Pilots (BA) |
| * - Panic in the Park - The Interactive Game by Imagination Pilots (PiP) |
| * - Where's Waldo? At the Circus (Waldo1) |
| * ART file packer and unpacker by Daniel Marschall, ViaThinkSoft (C) 2014-2018 |
| * Revision: 2018-02-15 |
| * |
| * The code is based on "Cross platform GIF source code" (c) L. Patrick |
| * http://www.cs.usyd.edu.au/~graphapp/package/src/libgif/gif.c |
| * It was simplified and modified to encode IPE16-LZW instead of GIF-LZW. |
| * The game uses exactly the compressed stream as defined in the GIF standard, |
| * but the compressed stream is not divided into chunks. |
| **/ |
| |
| #ifndef __inc__ipe16_lzw_encoder |
| #define __inc__ipe16_lzw_encoder |
| |
| #include <stdio.h> |
| #include <stdbool.h> |
| |
| #define LZ_MIN_BITS 9 |
| |
| #define LZ_MAX_CODE 4095 /* Largest 12 bit code */ |
| #define FLUSH_OUTPUT 4096 /* Impossible code = flush */ |
| |
| #define HT_SIZE 8192 /* 13 bit hash table size */ |
| #define HT_KEY_MASK 0x1FFF /* 13 bit key mask */ |
| |
| #define CLEAR_CODE 256 |
| #define END_CODE 257 |
| #define FIRST_CODE 258 |
| |
| #define HT_GET_KEY(x) ((x) >> 12) |
| #define HT_GET_CODE(x) ((x) & 0x0FFF) |
| #define HT_PUT_KEY(x) ((x) << 12) |
| #define HT_PUT_CODE(x) ((x) & 0x0FFF) |
| |
| typedef struct tagIpe16LZWEncoder { |
| int running_code; |
| int running_bits; |
| int max_code_plus_one; |
| int shift_state; |
| unsigned long shift_data; |
| unsigned long hash_table[HT_SIZE]; |
| } Ipe16LZWEncoder; |
| |
| Ipe16LZWEncoder* new_ipe16lzw_encoder(void); |
| void del_ipe16lzw_encoder(Ipe16LZWEncoder* encoder); |
| void ipe16lzw_encode(FILE* outFile, Ipe16LZWEncoder* encoder, unsigned char* input, int inputLength); |
| |
| #endif // #ifndef __inc__ipe16_lzw_encoder |
| |
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