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Diffstat (limited to 'dep/libmpq/libmpq/huffman.h')
| -rw-r--r-- | dep/libmpq/libmpq/huffman.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/dep/libmpq/libmpq/huffman.h b/dep/libmpq/libmpq/huffman.h new file mode 100644 index 00000000000..6f691088fa0 --- /dev/null +++ b/dep/libmpq/libmpq/huffman.h @@ -0,0 +1,151 @@ +/* + * huffman.h -- structures used for huffman compression. + * + * Copyright (c) 2003-2008 Maik Broemme <mbroemme@plusserver.de> + * + * This source was adepted from the C++ version of huffman.h included + * in stormlib. The C++ version belongs to the following authors: + * + * Ladislav Zezula <ladik@zezula.net> + * ShadowFlare <BlakFlare@hotmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef _HUFFMAN_H +#define _HUFFMAN_H + +/* define huffman compression and decompression values. */ +#define LIBMPQ_HUFF_DECOMPRESS 0 /* we want to decompress using huffman trees. */ + +/* define pointer conversions. */ +#define PTR_NOT(ptr) (struct huffman_tree_item_s *)(~(unsigned long)(ptr)) +#define PTR_PTR(ptr) ((struct huffman_tree_item_s *)(ptr)) +#define PTR_INT(ptr) (long)(ptr) + +/* define item handling. */ +#define INSERT_ITEM 1 /* insert item into huffman tree. */ +#define SWITCH_ITEMS 2 /* switch items isnide huffman tree. */ + +/* input stream for huffman decompression. */ +struct huffman_input_stream_s { + uint8_t *in_buf; /* 00 - input data. */ + uint32_t bit_buf; /* 04 - input bit buffer. */ + uint32_t bits; /* 08 - number of bits remaining in byte. */ +}; + +/* huffman tree item. */ +struct huffman_tree_item_s { + struct huffman_tree_item_s *next; /* 00 - pointer to next huffman tree item. */ + struct huffman_tree_item_s *prev; /* 04 - pointer to prev huffman tree item (< 0 if none). */ + uint32_t dcmp_byte; /* 08 - index of this item in item pointer array, decompressed byte value. */ + uint32_t byte_value; /* 0C - some byte value. */ + struct huffman_tree_item_s *parent; /* 10 - pointer to parent huffman tree item (NULL if none). */ + struct huffman_tree_item_s *child; /* 14 - pointer to child huffman tree item. */ +}; + +/* structure used for quick decompression. */ +struct huffman_decompress_s { + uint32_t offs00; /* 00 - 1 if resolved. */ + uint32_t bits; /* 04 - bit count. */ + union { + uint32_t dcmp_byte; /* 08 - byte value for decompress (if bitCount <= 7). */ + struct huffman_tree_item_s *p_item; /* 08 - huffman tree item (if number of bits is greater than 7). */ + }; +}; + +/* structure for huffman tree. */ +struct huffman_tree_s { + uint32_t cmp0; /* 0000 - 1 if compression type 0. */ + uint32_t offs0004; /* 0004 - some flag. */ + struct huffman_tree_item_s items0008[0x203]; /* 0008 - huffman tree items. */ + struct huffman_tree_item_s *item3050; /* 3050 - always NULL? */ + struct huffman_tree_item_s *item3054; /* 3054 - pointer to huffman tree item. */ + struct huffman_tree_item_s *item3058; /* 3058 - pointer to huffman tree item (< 0 if invalid). */ + struct huffman_tree_item_s *item305C; /* 305C - usually NULL. */ + struct huffman_tree_item_s *first; /* 3060 - pointer to top (first) huffman tree item. */ + struct huffman_tree_item_s *last; /* 3064 - pointer to bottom (last) huffman tree item (< 0 if invalid). */ + uint32_t items; /* 3068 - number of used huffman tree items. */ + struct huffman_tree_item_s *items306C[0x102]; /* 306C - huffman tree item pointer array. */ + struct huffman_decompress_s qd3474[0x80]; /* 3474 - array for quick decompression. */ + uint8_t table_1502A630[]; /* some table to make struct size flexible. */ +}; + +/* insert a new item into huffman tree. */ +void libmpq__huffman_insert_item( + struct huffman_tree_item_s **p_item, + struct huffman_tree_item_s *item, + uint32_t where, + struct huffman_tree_item_s *item2 +); + +/* remove item from huffman tree. */ +void libmpq__huffman_remove_item( + struct huffman_tree_item_s *hi +); + +/* get previous item from huffman tree. */ +struct huffman_tree_item_s *libmpq__huffman_previous_item( + struct huffman_tree_item_s *hi, + long value +); + +/* get one bit from stream. */ +uint32_t libmpq__huffman_get_1bit( + struct huffman_input_stream_s *is +); + +/* get seven bit from stream. */ +uint32_t libmpq__huffman_get_7bit( + struct huffman_input_stream_s *is +); + +/* get eight bit from stream. */ +uint32_t libmpq__huffman_get_8bit( + struct huffman_input_stream_s *is +); + +/* call 1500E740. */ +struct huffman_tree_item_s *libmpq__huffman_call_1500E740( + struct huffman_tree_s *ht +); + +/* call 1500E820- */ +void libmpq__huffman_call_1500E820( + struct huffman_tree_s *ht, + struct huffman_tree_item_s *p_item +); + +/* initialize the huffman tree. */ +void libmpq__huffman_tree_init( + struct huffman_tree_s *ht, + uint32_t cmp +); + +/* build the huffman tree. */ +void libmpq__huffman_tree_build( + struct huffman_tree_s *ht, + uint32_t cmp_type +); + +/* decompress the stream using huffman compression. */ +int32_t libmpq__do_decompress_huffman( + struct huffman_tree_s *ht, + struct huffman_input_stream_s *is, + uint8_t *out_buf, + uint32_t out_length +); + +#endif /* _HUFFMAN_H */ |