X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Flzx-decompress.c;h=18fa3d008b6b137bc77b8235839c8a93679a4871;hb=c6a1140e085f633273fcf47a6462bd9382ce118a;hp=13b00761eff664eaf4b68b6350c35620c9d12c4e;hpb=a2993f836221de10e3f3e220d38aa4b72d367a61;p=wimlib diff --git a/src/lzx-decompress.c b/src/lzx-decompress.c index 13b00761..18fa3d00 100644 --- a/src/lzx-decompress.c +++ b/src/lzx-decompress.c @@ -7,7 +7,7 @@ */ /* - * Copyright (C) 2012 Eric Biggers + * Copyright (C) 2012, 2013 Eric Biggers * * This file is part of wimlib, a library for working with WIM files. * @@ -107,6 +107,7 @@ */ #include "util.h" +#include "wimlib.h" #include "lzx.h" #include "decompress.h" #include @@ -133,9 +134,10 @@ struct lzx_tables { /* * Reads a Huffman-encoded symbol using the pre-tree. */ -static inline int read_huffsym_using_pretree(struct input_bitstream *istream, - const u16 pretree_decode_table[], - const u8 pretree_lens[], unsigned *n) +static inline int +read_huffsym_using_pretree(struct input_bitstream *istream, + const u16 pretree_decode_table[], + const u8 pretree_lens[], unsigned *n) { return read_huffsym(istream, pretree_decode_table, pretree_lens, LZX_PRETREE_NUM_SYMBOLS, LZX_PRETREE_TABLEBITS, n, @@ -143,9 +145,10 @@ static inline int read_huffsym_using_pretree(struct input_bitstream *istream, } /* Reads a Huffman-encoded symbol using the main tree. */ -static inline int read_huffsym_using_maintree(struct input_bitstream *istream, - const struct lzx_tables *tables, - unsigned *n) +static inline int +read_huffsym_using_maintree(struct input_bitstream *istream, + const struct lzx_tables *tables, + unsigned *n) { return read_huffsym(istream, tables->maintree_decode_table, tables->maintree_lens, LZX_MAINTREE_NUM_SYMBOLS, @@ -153,9 +156,10 @@ static inline int read_huffsym_using_maintree(struct input_bitstream *istream, } /* Reads a Huffman-encoded symbol using the length tree. */ -static inline int read_huffsym_using_lentree(struct input_bitstream *istream, - const struct lzx_tables *tables, - unsigned *n) +static inline int +read_huffsym_using_lentree(struct input_bitstream *istream, + const struct lzx_tables *tables, + unsigned *n) { return read_huffsym(istream, tables->lentree_decode_table, tables->lentree_lens, LZX_LENTREE_NUM_SYMBOLS, @@ -163,9 +167,10 @@ static inline int read_huffsym_using_lentree(struct input_bitstream *istream, } /* Reads a Huffman-encoded symbol using the aligned offset tree. */ -static inline int read_huffsym_using_alignedtree(struct input_bitstream *istream, - const struct lzx_tables *tables, - unsigned *n) +static inline int +read_huffsym_using_alignedtree(struct input_bitstream *istream, + const struct lzx_tables *tables, + unsigned *n) { return read_huffsym(istream, tables->alignedtree_decode_table, tables->alignedtree_lens, @@ -185,8 +190,9 @@ static inline int read_huffsym_using_alignedtree(struct input_bitstream *istream * @num_lens: Number of length values to decode and return. * */ -static int lzx_read_code_lens(struct input_bitstream *istream, u8 lens[], - unsigned num_lens) +static int +lzx_read_code_lens(struct input_bitstream *istream, u8 lens[], + unsigned num_lens) { /* Declare the decoding table and length table for the pretree. */ u16 pretree_decode_table[(1 << LZX_PRETREE_TABLEBITS) + @@ -306,11 +312,12 @@ static int lzx_read_code_lens(struct input_bitstream *istream, u8 lens[], * R0, R1, and R2 will be written (only for uncompressed * blocks, which contain this information in the header) */ -static int lzx_read_block_header(struct input_bitstream *istream, - unsigned *block_size_ret, - unsigned *block_type_ret, - struct lzx_tables *tables, - struct lru_queue *queue) +static int +lzx_read_block_header(struct input_bitstream *istream, + unsigned *block_size_ret, + unsigned *block_type_ret, + struct lzx_tables *tables, + struct lru_queue *queue) { int ret; unsigned block_type; @@ -511,12 +518,13 @@ static int lzx_read_block_header(struct input_bitstream *istream, * - Match refers to data before the window. * - The input bitstream ended unexpectedly. */ -static int lzx_decode_match(unsigned main_element, int block_type, - unsigned bytes_remaining, u8 *window, - unsigned window_pos, - const struct lzx_tables *tables, - struct lru_queue *queue, - struct input_bitstream *istream) +static int +lzx_decode_match(unsigned main_element, int block_type, + unsigned bytes_remaining, u8 *window, + unsigned window_pos, + const struct lzx_tables *tables, + struct lru_queue *queue, + struct input_bitstream *istream) { unsigned length_header; unsigned position_slot; @@ -668,8 +676,9 @@ static int lzx_decode_match(unsigned main_element, int block_type, return match_len; } -static void undo_call_insn_translation(u32 *call_insn_target, int input_pos, - int32_t file_size) +static void +undo_call_insn_translation(u32 *call_insn_target, int input_pos, + int32_t file_size) { int32_t abs_offset; int32_t rel_offset; @@ -709,8 +718,8 @@ static void undo_call_insn_translation(u32 *call_insn_target, int input_pos, * Call instruction processing is supposed to take the file size as a parameter, * as it is used in calculating the translated jump targets. But in WIM files, * this file size is always the same (LZX_WIM_MAGIC_FILESIZE == 12000000).*/ -static void undo_call_insn_preprocessing(u8 uncompressed_data[], - int uncompressed_data_len) +static void +undo_call_insn_preprocessing(u8 uncompressed_data[], int uncompressed_data_len) { for (int i = 0; i < uncompressed_data_len - 10; i++) { if (uncompressed_data[i] == 0xe8) { @@ -737,12 +746,13 @@ static void undo_call_insn_preprocessing(u8 uncompressed_data[], * @queue: The least-recently-used queue for match offsets. * @istream: The input bitstream for the compressed literals. */ -static int lzx_decompress_block(int block_type, unsigned block_size, - u8 *window, - unsigned window_pos, - const struct lzx_tables *tables, - struct lru_queue *queue, - struct input_bitstream *istream) +static int +lzx_decompress_block(int block_type, unsigned block_size, + u8 *window, + unsigned window_pos, + const struct lzx_tables *tables, + struct lru_queue *queue, + struct input_bitstream *istream) { unsigned main_element; unsigned end; @@ -777,26 +787,10 @@ static int lzx_decompress_block(int block_type, unsigned block_size, return 0; } -/* - * Decompresses a block of LZX-compressed data as used in the WIM file format. - * - * Note that this will NOT work unmodified for LZX as used in the cabinet - * format, which is not the same as in the WIM format! - * - * @compressed_data: A pointer to the compressed data. - * - * @compressed_len: The length of the compressed data, in bytes. - * - * @uncompressed_data: A pointer to the buffer into which to write the - * uncompressed data. - * - * @uncompressed_len: The length of the uncompressed data. It must be - * 32768 bytes or less. - * - * Return 0 on success; non-zero on failure. - */ -int lzx_decompress(const void *compressed_data, unsigned compressed_len, - void *uncompressed_data, unsigned uncompressed_len) +/* Documented in wimlib.h */ +WIMLIBAPI int +wimlib_lzx_decompress(const void *compressed_data, unsigned compressed_len, + void *uncompressed_data, unsigned uncompressed_len) { struct lzx_tables tables; struct input_bitstream istream;