Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
2 | daniel-mar | 1 | /** |
2 | * LZW Encoder for Imagination Pilots Entertainment 16-bit games (IPE16) |
||
3 | * - Blown Away - The Interactive Game by Imagination Pilots (BA) |
||
4 | * - Panic in the Park - The Interactive Game by Imagination Pilots (PiP) |
||
5 | * - Where's Waldo? At the Circus (Waldo1) |
||
6 | * ART file packer and unpacker by Daniel Marschall, ViaThinkSoft (C) 2014-2018 |
||
7 | * Revision: 2018-02-15 |
||
8 | * |
||
9 | * The code is based on "Cross platform GIF source code" (c) L. Patrick |
||
10 | * http://www.cs.usyd.edu.au/~graphapp/package/src/libgif/gif.c |
||
11 | * It was simplified and modified to encode IPE16-LZW instead of GIF-LZW. |
||
12 | * The game uses exactly the compressed stream as defined in the GIF standard, |
||
13 | * but the compressed stream is not divided into chunks. |
||
14 | **/ |
||
15 | |||
16 | #ifndef __inc__ipe16_lzw_encoder |
||
17 | #define __inc__ipe16_lzw_encoder |
||
18 | |||
19 | #include <stdio.h> |
||
20 | #include <stdbool.h> |
||
21 | |||
22 | #define LZ_MIN_BITS 9 |
||
23 | |||
24 | #define LZ_MAX_CODE 4095 /* Largest 12 bit code */ |
||
25 | #define FLUSH_OUTPUT 4096 /* Impossible code = flush */ |
||
26 | |||
27 | #define HT_SIZE 8192 /* 13 bit hash table size */ |
||
28 | #define HT_KEY_MASK 0x1FFF /* 13 bit key mask */ |
||
29 | |||
30 | #define CLEAR_CODE 256 |
||
31 | #define END_CODE 257 |
||
32 | #define FIRST_CODE 258 |
||
33 | |||
34 | #define HT_GET_KEY(x) ((x) >> 12) |
||
35 | #define HT_GET_CODE(x) ((x) & 0x0FFF) |
||
36 | #define HT_PUT_KEY(x) ((x) << 12) |
||
37 | #define HT_PUT_CODE(x) ((x) & 0x0FFF) |
||
38 | |||
39 | typedef struct tagIpe16LZWEncoder { |
||
40 | int running_code; |
||
41 | int running_bits; |
||
42 | int max_code_plus_one; |
||
43 | int shift_state; |
||
44 | unsigned long shift_data; |
||
45 | unsigned long hash_table[HT_SIZE]; |
||
46 | } Ipe16LZWEncoder; |
||
47 | |||
48 | Ipe16LZWEncoder* new_ipe16lzw_encoder(void); |
||
49 | void del_ipe16lzw_encoder(Ipe16LZWEncoder* encoder); |
||
50 | void ipe16lzw_encode(FILE* outFile, Ipe16LZWEncoder* encoder, unsigned char* input, int inputLength); |
||
51 | |||
52 | #endif // #ifndef __inc__ipe16_lzw_encoder |
||
53 |