zlib121/deflate.h
author Ryan C. Gordon <icculus@icculus.org>
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/* deflate.h -- internal compression state
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 * Copyright (C) 1995-2002 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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/* WARNING: this file should *not* be used by applications. It is
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   part of the implementation of the compression library and is
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   subject to change. Applications should only use zlib.h.
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 */
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/* @(#) $Id: deflate.h,v 1.1 2003/12/07 05:29:20 icculus Exp $ */
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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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/* define NO_GZIP when compiling if you want to disable gzip header and
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   trailer creation by deflate().  NO_GZIP would be used to avoid linking in
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   the crc code when it is not needed.  For shared libraries, gzip encoding
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   should be left enabled. */
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#ifndef NO_GZIP
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#  define GZIP
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#endif
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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   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
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    Byte  data_type;     /* UNKNOWN, BINARY or ASCII */
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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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    /* Sliding window. Input bytes are read into the second half of the window,
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     * and move to the first half later to keep a dictionary of at least wSize
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     * bytes. With this organization, matches are limited to a distance of
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     * wSize-MAX_MATCH bytes, but this ensures that IO is always
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     * performed with a length multiple of the block size. Also, it limits
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     * the window size to 64K, which is quite useful on MSDOS.
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     * To do: use the user input buffer as sliding window.
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     */
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    ulg window_size;
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    /* Actual size of window: 2*wSize, except when the user input buffer
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     * is directly used as sliding window.
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     */
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    Posf *prev;
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    /* Link to older string with same hash index. To limit the size of this
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     * array to 64K, this link is maintained only for the last 32K strings.
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     * An index in this array is thus a window index modulo 32K.
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     */
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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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    /* Number of bits by which ins_h must be shifted at each input
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     * step. It must be such that after MIN_MATCH steps, the oldest
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     * byte no longer takes part in the hash key, that is:
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     *   hash_shift * MIN_MATCH >= hash_bits
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     */
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    long block_start;
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    /* Window position at the beginning of the current output block. Gets
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     * negative when the window is moved backwards.
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     */
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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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    /* Length of the best match at previous step. Matches not greater than this
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     * are discarded. This is used in the lazy match evaluation.
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     */
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    uInt max_chain_length;
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    /* To speed up deflation, hash chains are never searched beyond this
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     * length.  A higher limit improves compression ratio but degrades the
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     * speed.
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     */
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    uInt max_lazy_match;
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    /* Attempt to find a better match only when the current match is strictly
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     * smaller than this value. This mechanism is used only for compression
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     * levels >= 4.
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     */
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#   define max_insert_length  max_lazy_match
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    /* Insert new strings in the hash table only if the match length is not
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     * greater than this length. This saves time but degrades compression.
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     * max_insert_length is used only for compression levels <= 3.
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     */
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   176
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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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   179
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    uInt good_match;
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   181
    /* Use a faster search when the previous match is longer than this */
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    int nice_match; /* Stop searching when current match exceeds this */
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                /* used by trees.c: */
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   186
    /* Didn't use ct_data typedef below to supress compiler warning */
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    struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
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   188
    struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
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   189
    struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */
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   190
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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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   194
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    ush bl_count[MAX_BITS+1];
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   196
    /* number of codes at each bit length for an optimal tree */
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   197
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   198
    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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    /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
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   202
     * The same heap array is used to build all trees.
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     */
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    uch depth[2*L_CODES+1];
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   206
    /* 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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   210
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    uInt  lit_bufsize;
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   212
    /* Size of match buffer for literals/lengths.  There are 4 reasons for
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   213
     * limiting lit_bufsize to 64K:
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   214
     *   - frequencies can be kept in 16 bit counters
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   215
     *   - if compression is not successful for the first block, all input
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   216
     *     data is still in the window so we can still emit a stored block even
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   217
     *     when input comes from standard input.  (This can also be done for
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   218
     *     all blocks if lit_bufsize is not greater than 32K.)
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   219
     *   - if compression is not successful for a file smaller than 64K, we can
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   220
     *     even emit a stored file instead of a stored block (saving 5 bytes).
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   221
     *     This is applicable only for zip (not gzip or zlib).
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   222
     *   - creating new Huffman trees less frequently may not provide fast
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   223
     *     adaptation to changes in the input data statistics. (Take for
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   224
     *     example a binary file with poorly compressible code followed by
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   225
     *     a highly compressible string table.) Smaller buffer sizes give
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   226
     *     fast adaptation but have of course the overhead of transmitting
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   227
     *     trees more frequently.
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   228
     *   - I can't count above 4
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   229
     */
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   230
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   231
    uInt last_lit;      /* running index in l_buf */
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   232
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   233
    ushf *d_buf;
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   234
    /* Buffer for distances. To simplify the code, d_buf and l_buf have
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   235
     * the same number of elements. To use different lengths, an extra flag
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   236
     * array would be necessary.
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   237
     */
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   238
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   239
    ulg opt_len;        /* bit length of current block with optimal trees */
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   240
    ulg static_len;     /* bit length of current block with static trees */
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   241
    uInt matches;       /* number of string matches in current block */
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   242
    int last_eob_len;   /* bit length of EOB code for last block */
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   243
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   244
#ifdef DEBUG
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   245
    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
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   246
    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
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   247
#endif
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    ush bi_buf;
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    /* Output buffer. bits are inserted starting at the bottom (least
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     * significant bits).
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     */
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    int bi_valid;
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    /* Number of valid bits in bi_buf.  All bits above the last valid bit
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     * are always zero.
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     */
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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 /* DEFLATE_H */