ftgzip.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

  while (--i) {                 /* note that i == g from above */
    *xp++ = (j += *p++);
  }


  /* Make a table of values in order of bit lengths */
  p = b;  i = 0;
  do {
    if ((j = *p++) != 0)
      v[x[j]++] = i;
  } while (++i < n);
  n = x[g];                     /* set n to length of v */


  /* Generate the Huffman codes and for each, make the table entries */
  x[0] = i = 0;                 /* first Huffman code is zero */
  p = v;                        /* grab values in bit order */
  h = -1;                       /* no tables yet--level -1 */
  w = -l;                       /* bits decoded == (l * h) */
  u[0] = (inflate_huft *)Z_NULL;        /* just to keep compilers happy */
  q = (inflate_huft *)Z_NULL;   /* ditto */
  z = 0;                        /* ditto */

  /* go through the bit lengths (k already is bits in shortest code) */
  for (; k <= g; k++)
  {
    a = c[k];
    while (a--)
    {
      /* here i is the Huffman code of length k bits for value *p */
      /* make tables up to required level */
      while (k > w + l)
      {
        h++;
        w += l;                 /* previous table always l bits */

        /* compute minimum size table less than or equal to l bits */
        z = g - w;
        z = z > (uInt)l ? (uInt)l : z;        /* table size upper limit */
        if ((f = 1 << (j = k - w)) > a + 1)     /* try a k-w bit table */
        {                       /* too few codes for k-w bit table */
          f -= a + 1;           /* deduct codes from patterns left */
          xp = c + k;
          if (j < z)
            while (++j < z)     /* try smaller tables up to z bits */
            {
              if ((f <<= 1) <= *++xp)
                break;          /* enough codes to use up j bits */
              f -= *xp;         /* else deduct codes from patterns */
            }
        }
        z = 1 << j;             /* table entries for j-bit table */

        /* allocate new table */
        if (*hn + z > MANY)     /* (note: doesn't matter for fixed) */
          return Z_DATA_ERROR;  /* overflow of MANY */
        u[h] = q = hp + *hn;
        *hn += z;

        /* connect to last table, if there is one */
        if (h)
        {
          x[h] = i;             /* save pattern for backing up */
          r.bits = (Byte)l;     /* bits to dump before this table */
          r.exop = (Byte)j;     /* bits in this table */
          j = i >> (w - l);
          r.base = (uInt)(q - u[h-1] - j);   /* offset to this table */
          u[h-1][j] = r;        /* connect to last table */
        }
        else
          *t = q;               /* first table is returned result */
      }

      /* set up table entry in r */
      r.bits = (Byte)(k - w);
      if (p >= v + n)
        r.exop = 128 + 64;      /* out of values--invalid code */
      else if (*p < s)
      {
        r.exop = (Byte)(*p < 256 ? 0 : 32 + 64);     /* 256 is end-of-block */
        r.base = *p++;          /* simple code is just the value */
      }
      else
      {
        r.exop = (Byte)(e[*p - s] + 16 + 64);/* non-simple--look up in lists */
        r.base = d[*p++ - s];
      }

      /* fill code-like entries with r */
      f = 1 << (k - w);
      for (j = i >> w; j < z; j += f)
        q[j] = r;

      /* backwards increment the k-bit code i */
      for (j = 1 << (k - 1); i & j; j >>= 1)
        i ^= j;
      i ^= j;

      /* backup over finished tables */
      mask = (1 << w) - 1;      /* needed on HP, cc -O bug */
      while ((i & mask) != x[h])
      {
        h--;                    /* don't need to update q */
        w -= l;
        mask = (1 << w) - 1;
      }
    }
  }


  /* Return Z_BUF_ERROR if we were given an incomplete table */
  return y != 0 && g != 1 ? Z_BUF_ERROR : Z_OK;
}


local int inflate_trees_bits( /* c, bb, tb, hp, z) */
uIntf *c,               /* 19 code lengths */
uIntf *bb,              /* bits tree desired/actual depth */
inflate_huft * FAR *tb, /* bits tree result */
inflate_huft *hp,       /* space for trees */
z_streamp z             /* for messages */
)
{
  int r;
  uInt hn = 0;          /* hufts used in space */
  uIntf *v;             /* work area for huft_build */

  if ((v = (uIntf*)ZALLOC(z, 19, sizeof(uInt))) == Z_NULL)
    return Z_MEM_ERROR;
  r = huft_build(c, 19, 19, (uIntf*)Z_NULL, (uIntf*)Z_NULL,
                 tb, bb, hp, &hn, v);
  if (r == Z_DATA_ERROR)
    z->msg = (char*)"oversubscribed dynamic bit lengths tree";
  else if (r == Z_BUF_ERROR || *bb == 0)
  {
    z->msg = (char*)"incomplete dynamic bit lengths tree";
    r = Z_DATA_ERROR;
  }
  ZFREE(z, v);
  return r;
}


local int inflate_trees_dynamic( /* nl, nd, c, bl, bd, tl, td, hp, z) */
uInt nl,                /* number of literal/length codes */
uInt nd,                /* number of distance codes */
uIntf *c,               /* that many (total) code lengths */
uIntf *bl,              /* literal desired/actual bit depth */
uIntf *bd,              /* distance desired/actual bit depth */
inflate_huft * FAR *tl, /* literal/length tree result */
inflate_huft * FAR *td, /* distance tree result */
inflate_huft *hp,       /* space for trees */
z_streamp z             /* for messages */
)
{
  int r;
  uInt hn = 0;          /* hufts used in space */
  uIntf *v;             /* work area for huft_build */

  /* allocate work area */
  if ((v = (uIntf*)ZALLOC(z, 288, sizeof(uInt))) == Z_NULL)
    return Z_MEM_ERROR;

  /* build literal/length tree */
  r = huft_build(c, nl, 257, cplens, cplext, tl, bl, hp, &hn, v);
  if (r != Z_OK || *bl == 0)
  {
    if (r == Z_DATA_ERROR)
      z->msg = (char*)"oversubscribed literal/length tree";
    else if (r != Z_MEM_ERROR)
    {
      z->msg = (char*)"incomplete literal/length tree";
      r = Z_DATA_ERROR;
    }
    ZFREE(z, v);
    return r;
  }

  /* build distance tree */
  r = huft_build(c + nl, nd, 0, cpdist, cpdext, td, bd, hp, &hn, v);
  if (r != Z_OK || (*bd == 0 && nl > 257))
  {
    if (r == Z_DATA_ERROR)
      z->msg = (char*)"oversubscribed distance tree";
    else if (r == Z_BUF_ERROR) {
#ifdef PKZIP_BUG_WORKAROUND
      r = Z_OK;
    }
#else
      z->msg = (char*)"incomplete distance tree";
      r = Z_DATA_ERROR;
    }
    else if (r != Z_MEM_ERROR)
    {
      z->msg = (char*)"empty distance tree with lengths";
      r = Z_DATA_ERROR;
    }
    ZFREE(z, v);
    return r;
#endif
  }

  /* done */
  ZFREE(z, v);
  return Z_OK;
}


/* build fixed tables only once--keep them here */
#ifdef BUILDFIXED
local int fixed_built = 0;
#define FIXEDH 544      /* number of hufts used by fixed tables */
local inflate_huft fixed_mem[FIXEDH];
local uInt fixed_bl;
local uInt fixed_bd;
local inflate_huft *fixed_tl;
local inflate_huft *fixed_td;
#else
#include "inffixed.h"
#endif


local int inflate_trees_fixed( /* bl, bd, tl, td, z) */
uIntf *bl,                      /* literal desired/actual bit depth */
uIntf *bd,                      /* distance desired/actual bit depth */
const inflate_huft * FAR *tl,   /* literal/length tree result */
const inflate_huft * FAR *td,   /* distance tree result */
z_streamp z                     /* for memory allocation */
)
{
#ifdef BUILDFIXED
  /* build fixed tables if not already */
  if (!fixed_built)
  {
    int k;              /* temporary variable */
    uInt f = 0;         /* number of hufts used in fixed_mem */
    uIntf *c;           /* length list for huft_build */
    uIntf *v;           /* work area for huft_build */

    /* allocate memory */
    if ((c = (uIntf*)ZALLOC(z, 288, sizeof(uInt))) == Z_NULL)
      return Z_MEM_ERROR;
    if ((v = (uIntf*)ZALLOC(z, 288, sizeof(uInt))) == Z_NULL)
    {
      ZFREE(z, c);
      return Z_MEM_ERROR;
    }

    /* literal table */
    for (k = 0; k < 144; k++)
      c[k] = 8;
    for (; k < 256; k++)
      c[k] = 9;
    for (; k < 280; k++)
      c[k] = 7;
    for (; k < 288; k++)
      c[k] = 8;
    fixed_bl = 9;
    huft_build(c, 288, 257, cplens, cplext, &fixed_tl, &fixed_bl,
               fixed_mem, &f, v);

    /* distance table */
    for (k = 0; k < 30; k++)
      c[k] = 5;
    fixed_bd = 5;
    huft_build(c, 30, 0, cpdist, cpdext, &fixed_td, &fixed_bd,
               fixed_mem, &f, v);

    /* done */
    ZFREE(z, v);
    ZFREE(z, c);
    fixed_built = 1;
  }
#else
  FT_UNUSED(z);
#endif
  *bl = fixed_bl;
  *bd = fixed_bd;
  *tl = fixed_tl;
  *td = fixed_td;
  return Z_OK;
}

/* inflate_util.c -- data and routines common to blocks and codes
 * Copyright (C) 1995-2002 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "infblock.h"
#include "inftrees.h"
#include "infcodes.h"
#include "infutil.h"


/* And'ing with mask[n] masks the lower n bits */
local const uInt inflate_mask[17] = {
    0x0000,
    0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
    0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};


/* copy as much as possible from the sliding window to the output area */
local int inflate_flush( /* s, z, r) */
inflate_blocks_statef *s,
z_streamp z,
int r )
{
  uInt n;
  Bytef *p;
  Bytef *q;

  /* local copies of source and destination pointers */
  p = z->next_out;
  q = s->read;

  /* compute number of bytes to copy as far as end of window */
  n = (uInt)((q <= s->write ? s->write : s->end) - q);
  if (n > z->avail_out) n = z->avail_out;
  if (n && r == Z_BUF_ERROR) r = Z_OK;

  /* update counters */
  z->avail_out -= n;
  z->total_out += n;

  /* update check information */
  if (s->checkfn != Z_NULL)
    z->adler = s->check = (*s->checkfn)(s->check, q, n);

  /* copy as far as end of window */
  zmemcpy(p, q, n);
  p += n;
  q += n;

  /* see if more to copy at beginning of window */
  if (q == s->end)
  {
    /* wrap pointers */
    q = s->window;
    if (s->write == s->end)
      s->write = s->window;

    /* compute bytes to copy */
    n = (uInt)(s->write - q);
    if (n > z->avail_out) n = z->avail_out;
    if (n && r == Z_BUF_ERROR) r = Z_OK;

    /* update counters */
    z->avail_out -= n;
    z->total_out += n;

    /* update check information */
    if (s->checkfn != Z_NULL)
      z->adler = s->check = (*s->checkfn)(s->check, q, n);

    /* copy */
    zmemcpy(p, q, n);
    p += n;
    q += n;
  }

  /* update pointers */
  z->next_out = p;
  s->read = q;

  /* done */
  return r;
}

/* infcodes.c -- process literals and length/distance pairs
 * Copyright (C) 1995-2002 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "zutil.h"
#include "inftrees.h"
#include "infblock.h"
#include "infcodes.h"
#include "infutil.h"

/* simplify the use of the inflate_huft type with some defines */
#define exop word.what.Exop
#define bits word.what.Bits

typedef enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
      START,    /* x: set up for LEN */
      LEN,      /* i: get length/literal/eob next */
      LENEXT,   /* i: getting length extra (have base) */
      DIST,     /* i: get distance next */
      DISTEXT,  /* i: getting distance extra */
      COPY,     /* o: copying bytes in window, waiting for space */
      LIT,      /* o: got literal, waiting for output space */
      WASH,     /* o: got eob, possibly still output waiting */
      END,      /* x: got eob and all data flushed */
      BADCODE}  /* x: got error */
inflate_codes_mode;

/* inflate codes private state */
struct inflate_codes_state {

  /* mode */
  inflate_codes_mode mode;      /* current inflate_codes mode */

  /* mode dependent information */
  uInt len;
  union {
    struct {
      inflate_huft *tree;       /* pointer into tree */
      uInt need;                /* bits needed */
    } code;             /* if LEN or DIST, where in tree */
    uInt lit;           /* if LIT, literal */
    struct {
      uInt get;                 /* bits to get for extra */
      uInt dist;                /* distance back to copy from */
    } copy;             /* if EXT or COPY, where and how much */
  } sub;                /* submode */

  /* mode independent information */
  Byte lbits;           /* ltree bits decoded per branch */
  Byte dbits;           /* dtree bits decoder per branch */
  inflate_huft *ltree;          /* literal/length/eob tree */
  inflate_huft *dtree;          /* distance tree */

};


local inflate_codes_statef *inflate_codes_new( /* bl, bd, tl, td, z) */
uInt bl, uInt bd,
inflate_huft *tl,
inflate_huft *td, /* need separate declaration for Borland C++ */
z_streamp z )
{
  inflate_codes_statef *c;

  if ((c = (inflate_codes_statef *)