0aed504f4a
git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@5917 212acab6-be3b-0410-9dea-997c60f758d6
251 lines
7.7 KiB
C
251 lines
7.7 KiB
C
/*
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* This file is a part of the zlib compression module for NSIS.
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*
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* Copyright and license information can be found below.
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* Modifications Copyright (C) 1999-2009 Nullsoft and Contributors
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*
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* The original zlib source code is available at
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* http://www.zlib.net/
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*
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* This software is provided 'as-is', without any express or implied
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* warranty.
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*/
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/* deflate.h -- internal compression state
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* Copyright (C) 1995-1998 Jean-loup Gailly
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#ifndef _DEFLATE_H
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#define _DEFLATE_H
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#include "ZUTIL.H"
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/* ===========================================================================
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* Internal compression state.
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*/
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#define LENGTH_CODES 29
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/* number of length codes, not counting the special END_BLOCK code */
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#define LITERALS 256
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/* number of literal bytes 0..255 */
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#define L_CODES (LITERALS+1+LENGTH_CODES)
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/* number of Literal or Length codes, including the END_BLOCK code */
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#define D_CODES 30
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/* number of distance codes */
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#define BL_CODES 19
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/* number of codes used to transfer the bit lengths */
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#define HEAP_SIZE (2*L_CODES+1)
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/* maximum heap size */
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#define MAX_BITS 15
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/* All codes must not exceed MAX_BITS bits */
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#define INIT_STATE 42
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#define BUSY_STATE 113
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#define FINISH_STATE 666
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/* Stream status */
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/* Data structure describing a single value and its code string. */
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typedef struct ct_data_s {
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union {
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ush freq; /* frequency count */
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ush code; /* bit string */
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} fc;
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union {
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ush dad; /* father node in Huffman tree */
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ush len; /* length of bit string */
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} dl;
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} FAR ct_data;
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#define Freq fc.freq
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#define Code fc.code
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#define Dad dl.dad
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#define Len dl.len
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typedef struct static_tree_desc_s static_tree_desc;
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typedef struct tree_desc_s {
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ct_data *dyn_tree; /* the dynamic tree */
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int max_code; /* largest code with non zero frequency */
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static_tree_desc *stat_desc; /* the corresponding static tree */
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} FAR tree_desc;
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typedef ush Pos;
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typedef Pos FAR Posf;
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typedef unsigned IPos;
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/* A Pos is an index in the character window. We use short instead of int to
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* save space in the various tables. IPos is used only for parameter passing.
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*/
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typedef struct internal_state {
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z_streamp strm; /* pointer back to this zlib stream */
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int status; /* as the name implies */
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Bytef *pending_buf; /* output still pending */
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ulg pending_buf_size; /* size of pending_buf */
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Bytef *pending_out; /* next pending byte to output to the stream */
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int pending; /* nb of bytes in the pending buffer */
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int noheader; /* suppress zlib header and adler32 */
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Byte method; /* STORED (for zip only) or DEFLATED */
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int last_flush; /* value of flush param for previous deflate call */
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/* used by deflate.c: */
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uInt w_size; /* LZ77 window size (32K by default) */
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uInt w_bits; /* log2(w_size) (8..16) */
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uInt w_mask; /* w_size - 1 */
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Bytef *window;
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ulg window_size;
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Posf *prev;
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Posf *head; /* Heads of the hash chains or NIL. */
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uInt ins_h; /* hash index of string to be inserted */
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uInt hash_size; /* number of elements in hash table */
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uInt hash_bits; /* log2(hash_size) */
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uInt hash_mask; /* hash_size-1 */
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uInt hash_shift;
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long block_start;
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uInt match_length; /* length of best match */
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IPos prev_match; /* previous match */
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int match_available; /* set if previous match exists */
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uInt strstart; /* start of string to insert */
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uInt match_start; /* start of matching string */
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uInt lookahead; /* number of valid bytes ahead in window */
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uInt prev_length;
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uInt max_chain_length;
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uInt max_lazy_match;
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# define max_insert_length max_lazy_match
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int level; /* compression level (1..9) */
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int strategy; /* favor or force Huffman coding*/
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uInt good_match;
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int nice_match; /* Stop searching when current match exceeds this */
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struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
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struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
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struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
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struct tree_desc_s l_desc; /* desc. for literal tree */
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struct tree_desc_s d_desc; /* desc. for distance tree */
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struct tree_desc_s bl_desc; /* desc. for bit length tree */
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ush bl_count[MAX_BITS+1];
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/* number of codes at each bit length for an optimal tree */
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int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
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int heap_len; /* number of elements in the heap */
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int heap_max; /* element of largest frequency */
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uch depth[2*L_CODES+1];
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/* Depth of each subtree used as tie breaker for trees of equal frequency
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*/
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uchf *l_buf; /* buffer for literals or lengths */
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uInt lit_bufsize;
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uInt last_lit; /* running index in l_buf */
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ushf *d_buf;
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ulg opt_len; /* bit length of current block with optimal trees */
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ulg static_len; /* bit length of current block with static trees */
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uInt matches; /* number of string matches in current block */
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int last_eob_len; /* bit length of EOB code for last block */
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#ifdef DEBUG
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ulg compressed_len; /* total bit length of compressed file mod 2^32 */
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ulg bits_sent; /* bit length of compressed data sent mod 2^32 */
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#endif
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ush bi_buf;
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int bi_valid;
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} FAR deflate_state;
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/* Output a byte on the stream.
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* IN assertion: there is enough room in pending_buf.
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*/
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#define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}
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#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
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/* Minimum amount of lookahead, except at the end of the input file.
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* See deflate.c for comments about the MIN_MATCH+1.
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*/
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#define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
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/* In order to simplify the code, particularly on 16 bit machines, match
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* distances are limited to MAX_DIST instead of WSIZE.
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*/
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/* in trees.c */
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void _tr_init OF((deflate_state *s));
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int _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
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void _tr_flush_block OF((deflate_state *s, charf *buf, ulg stored_len,
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int eof));
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void _tr_align OF((deflate_state *s));
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void _tr_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
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int eof));
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#define d_code(dist) \
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((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
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/* Mapping from a distance to a distance code. dist is the distance - 1 and
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* must not have side effects. _dist_code[256] and _dist_code[257] are never
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* used.
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*/
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#ifndef DEBUG
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/* Inline versions of _tr_tally for speed: */
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#if defined(GEN_TREES_H) || !defined(STDC)
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extern uch _length_code[];
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extern uch _dist_code[];
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#else
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extern const uch _length_code[];
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extern const uch _dist_code[];
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#endif
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# define _tr_tally_lit(s, c, flush) \
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{ uch cc = (c); \
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s->d_buf[s->last_lit] = 0; \
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s->l_buf[s->last_lit++] = cc; \
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s->dyn_ltree[cc].Freq++; \
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flush = (s->last_lit == s->lit_bufsize-1); \
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}
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# define _tr_tally_dist(s, distance, length, flush) \
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{ uch len = (length); \
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ush dist = (distance); \
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s->d_buf[s->last_lit] = dist; \
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s->l_buf[s->last_lit++] = len; \
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dist--; \
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s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
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s->dyn_dtree[d_code(dist)].Freq++; \
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flush = (s->last_lit == s->lit_bufsize-1); \
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}
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#else
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# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
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# define _tr_tally_dist(s, distance, length, flush) \
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flush = _tr_tally(s, distance, length)
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#endif
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#endif
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