#include <stdio.h>
#include <stdlib.h>
#include <string.h>

Include dependency graph for inflate.c:

Classes
struct	huft
Defines
#define	WSIZE 0x8000
#define	NEXTBYTE csz__ReadByte()
#define	FPRINTF fprintf
#define	FLUSH(n) csz__WriteData(n)
#define	Trace(x)
#define	CHECK_EOF
#define	NEEDBITS(n)
#define	DUMPBITS(n) {b>>=(n);k-=(n);}
#define	BMAX 16
#define	N_MAX 288
Typedefs
typedef char	boolean
typedef unsigned char	uch
typedef unsigned short	ush
typedef unsigned long	ulg
Functions
int	csz__huft_build (unsigned , unsigned, unsigned, ush , ush , struct huft , int )
int	csz__huft_free (struct huft *)
int	csz__Inflate_codes (struct huft , struct huft , int, int)
int	csz__Inflate_stored (void)
int	csz__Inflate_fixed (void)
int	csz__Inflate_dynamic (void)
int	csz__Inflate_block (int *)
int	csz__Inflate (void)
int	csz__Inflate_free (void)
void	csz__Init_Inflate (long a_ibufcnt, unsigned char a_ibufptr, long a_obufcnt, unsigned char a_obufptr)
unsigned char *	csz__obufptr ()
Variables
static uch *	obufptr
static long	obufcnt
struct huft *	csz__fixed_tl = (struct huft *)NULL
struct huft *	csz__fixed_td
int	csz__fixed_bl
int	csz__fixed_bd

Define Documentation

#define BMAX 16

Definition at line 419 of file inflate.c.

#define CHECK_EOF

Definition at line 364 of file inflate.c.

#define DUMPBITS ( n ) {b>>=(n);k-=(n);}

Definition at line 378 of file inflate.c.

#define FLUSH ( n ) csz__WriteData(n)

Definition at line 241 of file inflate.c.

#define FPRINTF fprintf

Definition at line 237 of file inflate.c.

#define N_MAX 288

Definition at line 420 of file inflate.c.

#define NEEDBITS ( n )

Value:

{while(k<(n)){if(ibufcnt-- <= 0)return 1;\
    b|=((ulg) *ibufptr++)<<k;k+=8;}}

Definition at line 374 of file inflate.c.

#define NEXTBYTE csz__ReadByte()

Definition at line 233 of file inflate.c.

#define Trace ( x )

Definition at line 250 of file inflate.c.

#define WSIZE 0x8000

Definition at line 229 of file inflate.c.

Typedef Documentation

typedef char boolean

Definition at line 223 of file inflate.c.

typedef unsigned char uch

Definition at line 224 of file inflate.c.

typedef unsigned long ulg

Definition at line 226 of file inflate.c.

typedef unsigned short ush

Definition at line 225 of file inflate.c.

Function Documentation

int csz__huft_build	(	unsigned *	b,
		unsigned	n,
		unsigned	s,
		ush *	d,
		ush *	e,
		struct huft **	t,
		int *	m
	)

Definition at line 426 of file inflate.c.

{
  unsigned a;                   /* counter for codes of length k */
  unsigned c[BMAX+1];           /* bit length count table */
  unsigned el;                  /* length of EOB code (value 256) */
  unsigned f;                   /* i repeats in table every f entries */
  int g;                        /* maximum code length */
  int h;                        /* table level */
  register unsigned i;          /* counter, current code */
  register unsigned j;          /* counter */
  register int k;               /* number of bits in current code */
  int lx[BMAX+1];               /* memory for l[-1..BMAX-1] */
  int *l = lx+1;                /* stack of bits per table */
  register unsigned *p;         /* pointer into c[], b[], or v[] */
  register struct huft *q;      /* points to current table */
  struct huft r;                /* table entry for structure assignment */
  struct huft *u[BMAX];         /* table stack */
  static unsigned v[N_MAX];     /* values in order of bit length */
  register int w;               /* bits before this table == (l * h) */
  unsigned x[BMAX+1];           /* bit offsets, then code stack */
  unsigned *xp;                 /* pointer into x */
  int y;                        /* number of dummy codes added */
  unsigned z;                   /* number of entries in current table */


  /* Generate counts for each bit length */
  el = n > 256 ? b[256] : BMAX; /* set length of EOB code, if any */
  memset((char *)c,0,sizeof(c));
  p = b;  i = n;
  do {
    c[*p]++; p++;               /* assume all entries <= BMAX */
  } while (--i);
  if (c[0] == n)                /* null input--all zero length codes */
  {
    *t = (struct huft *)NULL;
    *m = 0;
    return 0;
  }


  /* Find minimum and maximum length, bound *m by those */
  for (j = 1; j <= BMAX; j++)
    if (c[j])
      break;
  k = j;                        /* minimum code length */
  if ((unsigned)*m < j)
    *m = j;
  for (i = BMAX; i; i--)
    if (c[i])
      break;
  g = i;                        /* maximum code length */
  if ((unsigned)*m > i)
    *m = i;


  /* Adjust last length count to fill out codes, if needed */
  for (y = 1 << j; j < i; j++, y <<= 1)
    if ((y -= c[j]) < 0)
      return 2;                 /* bad input: more codes than bits */
  if ((y -= c[i]) < 0)
    return 2;
  c[i] += y;


  /* Generate starting offsets into the value table for each length */
  x[1] = j = 0;
  p = c + 1;  xp = x + 2;
  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);


  /* 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[-1] = 0;                /* no bits decoded yet */
  u[0] = (struct huft *)NULL;   /* just to keep compilers happy */
  q = (struct huft *)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[h++];            /* add bits already decoded */

        /* compute minimum size table less than or equal to *m bits */
        z = (z = g - w) > (unsigned)*m ? (unsigned) *m : z;   /* 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;
          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 */
          }
        }
        if ((unsigned)w + j > el && (unsigned)w < el)
          j = el - w;           /* make EOB code end at table */
        z = 1 << j;             /* table entries for j-bit table */
        l[h] = j;               /* set table size in stack */

        /* allocate and link in new table */
        if ((q = (struct huft *)malloc((z + 1)*sizeof(struct huft))) ==
            (struct huft *)NULL)
        {
          if (h)
            csz__huft_free(u[0]);
          return 3;             /* not enough memory */
        }
        hufts += z + 1;         /* track memory usage */
        *t = q + 1;             /* link to list for huft_free() */
        *(t = &(q->v.t)) = (struct huft *)NULL;
        u[h] = ++q;             /* table starts after link */

        /* connect to last table, if there is one */
        if (h)
        {
          x[h] = i;             /* save pattern for backing up */
          r.b = (uch)l[h-1];    /* bits to dump before this table */
          r.e = (uch)(16 + j);  /* bits in this table */
          r.v.t = q;            /* pointer to this table */
          j = (i & ((1 << w) - 1)) >> (w - l[h-1]);
          u[h-1][j] = r;        /* connect to last table */
        }
      }

      /* set up table entry in r */
      r.b = (uch)(k - w);
      if (p >= v + n)
        r.e = 99;               /* out of values--invalid code */
      else if (*p < s) {
        r.e = (uch)(*p < 256 ? 16 : 15);    /* 256 is end-of-block code */
        r.v.n = *p++;           /* simple code is just the value */
      } else if(e && d) {
        r.e = (uch)e[*p - s];   /* non-simple--look up in lists */
        r.v.n = d[*p++ - s];
      } else return 1;

      /* 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 */
      while ((i & ((1 << w) - 1)) != x[h])
        w -= l[--h];            /* don't need to update q */
    }
  }


  /* return actual size of base table */
  *m = l[0];


  /* Return true (1) if we were given an incomplete table */
  return y != 0 && g != 1;
}

int csz__huft_free ( struct huft * t )

Definition at line 624 of file inflate.c.

{
  register struct huft *p, *q;


  /* Go through linked list, freeing from the malloced (t[-1]) address. */
  p = t;
  while (p != (struct huft *)NULL)
  {
    q = (--p)->v.t;
    free(p);
    p = q;
  }
  return 0;
}

int csz__Inflate ( void )

Definition at line 1083 of file inflate.c.

{
  int e;                /* last block flag */
  int r;                /* result code */
  unsigned h;           /* maximum struct huft's malloc'ed */


  /* initialize window, bit buffer */
  wp = 0;
  bk = 0;
  bb = 0;


  /* decompress until the last block */
  h = 0;
  do {
    hufts = 0;
    if ((r = csz__Inflate_block(&e)) != 0)
      return r;
    if (hufts > h)
      h = hufts;
  } while (!e);


  /* flush out slide */
  FLUSH(wp);


  /* return success */
  Trace((stderr, "\n%lu bytes in Huffman tables (%lu/entry)\n",
         h * sizeof(struct huft), sizeof(struct huft)));
  return 0;
}

int csz__Inflate_block ( int * e )

Definition at line 1035 of file inflate.c.

{
  unsigned t;           /* block type */
  register ulg b;       /* bit buffer */
  register unsigned k;  /* number of bits in bit buffer */


  /* make local bit buffer */
  b = bb;
  k = bk;


  /* read in last block bit */
  NEEDBITS(1)
  *e = (int)b & 1;
  DUMPBITS(1)


  /* read in block type */
  NEEDBITS(2)
  t = (unsigned)b & 3;
  DUMPBITS(2)


  /* restore the global bit buffer */
  bb = b;
  bk = k;


  /* inflate that block type */
  if (t == 2)
    return csz__Inflate_dynamic();
  if (t == 0)
    return csz__Inflate_stored();
  if (t == 1)
    return csz__Inflate_fixed();


  /* bad block type */
  return 2;
}

int csz__Inflate_codes	(	struct huft *	tl,
		struct huft *	td,
		int	bl,
		int	bd
	)

Definition at line 653 of file inflate.c.

{
  register unsigned e;  /* table entry flag/number of extra bits */
  unsigned n, d;        /* length and index for copy */
  unsigned w;           /* current window position */
  struct huft *t;       /* pointer to table entry */
  unsigned ml, md;      /* masks for bl and bd bits */
  register ulg b;       /* bit buffer */
  register unsigned k;  /* number of bits in bit buffer */


  /* make local copies of globals */
  b = bb;                       /* initialize bit buffer */
  k = bk;
  w = wp;                       /* initialize window position */


  /* inflate the coded data */
  ml = mask[bl];           /* precompute masks for speed */
  md = mask[bd];
  while (1)                     /* do until end of block */
  {
    NEEDBITS((unsigned)bl)
    if ((e = (t = tl + ((unsigned)b & ml))->e) > 16)
      do {
        if (e == 99)
          return 1;
        DUMPBITS(t->b)
        e -= 16;
        NEEDBITS(e)
      } while ((e = (t = t->v.t + ((unsigned)b & mask[e]))->e) > 16);
    DUMPBITS(t->b)
    if (e == 16)                /* then it's a literal */
    {
      csz__slide[w++] = (uch)t->v.n;
      if (w == WSIZE)
      {
        FLUSH(w);
        w = 0;
      }
    }
    else                        /* it's an EOB or a length */
    {
      /* exit if end of block */
      if (e == 15)
        break;

      /* get length of block to copy */
      NEEDBITS(e)
      n = t->v.n + ((unsigned)b & mask[e]);
      DUMPBITS(e);

      /* decode distance of block to copy */
      NEEDBITS((unsigned)bd)
      if ((e = (t = td + ((unsigned)b & md))->e) > 16)
        do {
          if (e == 99)
            return 1;
          DUMPBITS(t->b)
          e -= 16;
          NEEDBITS(e)
        } while ((e = (t = t->v.t + ((unsigned)b & mask[e]))->e) > 16);
      DUMPBITS(t->b)
      NEEDBITS(e)
      d = w - t->v.n - ((unsigned)b & mask[e]);
      DUMPBITS(e)

      /* do the copy */
      do {
        n -= (e = (e = WSIZE - ((d &= WSIZE-1) > w ? d : w)) > n ? n : e);
#ifndef NOMEMCPY
        if (w - d >= e)         /* (this test assumes unsigned comparison) */
        {
          memcpy(csz__slide + w, csz__slide + d, e);
          w += e;
          d += e;
        }
        else                      /* do it slow to avoid memcpy() overlap */
#endif /* !NOMEMCPY */
          do {
            csz__slide[w++] = csz__slide[d++];
          } while (--e);
        if (w == WSIZE)
        {
          FLUSH(w);
          w = 0;
        }
      } while (n);
    }
  }


  /* restore the globals from the locals */
  wp = w;                       /* restore global window pointer */
  bb = b;                       /* restore global bit buffer */
  bk = k;


  /* done */
  return 0;
}

int csz__Inflate_dynamic ( void )

Definition at line 869 of file inflate.c.

{
  int i;                /* temporary variables */
  unsigned j;
  unsigned l;           /* last length */
  unsigned m;           /* mask for bit lengths table */
  unsigned n;           /* number of lengths to get */
  struct huft *tl;      /* literal/length code table */
  struct huft *td;      /* distance code table */
  int bl;               /* lookup bits for tl */
  int bd;               /* lookup bits for td */
  unsigned nb;          /* number of bit length codes */
  unsigned nl;          /* number of literal/length codes */
  unsigned nd;          /* number of distance codes */
#ifdef PKZIP_BUG_WORKAROUND
  static unsigned ll[288+32]; /* literal/length and distance code lengths */
#else
  static unsigned ll[286+30]; /* literal/length and distance code lengths */
#endif
  register ulg b;       /* bit buffer */
  register unsigned k;  /* number of bits in bit buffer */

  static int qflag = 0; /*G.Barrand*/

  /* make local bit buffer */
  Trace((stderr, "\ndynamic block"));
  b = bb;
  k = bk;


  /* read in table lengths */
  NEEDBITS(5)
  nl = 257 + ((unsigned)b & 0x1f);      /* number of literal/length codes */
  DUMPBITS(5)
  NEEDBITS(5)
  nd = 1 + ((unsigned)b & 0x1f);        /* number of distance codes */
  DUMPBITS(5)
  NEEDBITS(4)
  nb = 4 + ((unsigned)b & 0xf);         /* number of bit length codes */
  DUMPBITS(4)
#ifdef PKZIP_BUG_WORKAROUND
  if (nl > 288 || nd > 32)
#else
  if (nl > 286 || nd > 30)
#endif
    return 1;                   /* bad lengths */


  /* read in bit-length-code lengths */
  for (j = 0; j < nb; j++)
  {
    NEEDBITS(3)
    ll[border[j]] = (unsigned)b & 7;
    DUMPBITS(3)
  }
  for (; j < 19; j++)
    ll[border[j]] = 0;


  /* build decoding table for trees--single level, 7 bit lookup */
  bl = 7;
  if ((i = csz__huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0)
  {
    if (i == 1)
      csz__huft_free(tl);
    return i;                   /* incomplete code set */
  }


  /* read in literal and distance code lengths */
  n = nl + nd;
  m = mask[bl];
  i = l = 0;
  while ((unsigned)i < n)
  {
    NEEDBITS((unsigned)bl)
    j = (td = tl + ((unsigned)b & m))->b;
    DUMPBITS(j)
    j = td->v.n;
    if (j < 16)                 /* length of code in bits (0..15) */
      ll[i++] = l = j;          /* save last length in l */
    else if (j == 16)           /* repeat last length 3 to 6 times */
    {
      NEEDBITS(2)
      j = 3 + ((unsigned)b & 3);
      DUMPBITS(2)
      if ((unsigned)i + j > n)
        return 1;
      while (j--)
        ll[i++] = l;
    }
    else if (j == 17)           /* 3 to 10 zero length codes */
    {
      NEEDBITS(3)
      j = 3 + ((unsigned)b & 7);
      DUMPBITS(3)
      if ((unsigned)i + j > n)
        return 1;
      while (j--)
        ll[i++] = 0;
      l = 0;
    }
    else                        /* j == 18: 11 to 138 zero length codes */
    {
      NEEDBITS(7)
      j = 11 + ((unsigned)b & 0x7f);
      DUMPBITS(7)
      if ((unsigned)i + j > n)
        return 1;
      while (j--)
        ll[i++] = 0;
      l = 0;
    }
  }


  /* free decoding table for trees */
  csz__huft_free(tl);


  /* restore the global bit buffer */
  bb = b;
  bk = k;


  /* build the decoding tables for literal/length and distance codes */
  bl = lbits;
  if ((i = csz__huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0)
  {
    if (i == 1 && !qflag) {
      FPRINTF(stderr, "(incomplete l-tree)  ");
      csz__huft_free(tl);
    }
    return i;                   /* incomplete code set */
  }
  bd = dbits;
  if ((i = csz__huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0)
  {
    if (i == 1 && !qflag) {
      FPRINTF(stderr, "(incomplete d-tree)  ");
#ifdef PKZIP_BUG_WORKAROUND
      i = 0;
    }
#else
      csz__huft_free(td);
    }
    csz__huft_free(tl);
    return i;                   /* incomplete code set */
#endif
  }


  /* decompress until an end-of-block code */
  if (csz__Inflate_codes(tl, td, bl, bd))
    return 1;


  /* free the decoding tables, return */
  csz__huft_free(tl);
  csz__huft_free(td);
  return 0;
}

int csz__Inflate_fixed ( void )

Definition at line 821 of file inflate.c.

{
  /* if first time, set up tables for fixed blocks */
  Trace((stderr, "\nliteral block"));
  if (csz__fixed_tl == (struct huft *)NULL)
  {
    int i;                /* temporary variable */
    static unsigned l[288]; /* length list for huft_build */

    /* literal table */
    for (i = 0; i < 144; i++)
      l[i] = 8;
    for (; i < 256; i++)
      l[i] = 9;
    for (; i < 280; i++)
      l[i] = 7;
    for (; i < 288; i++)          /* make a complete, but wrong code set */
      l[i] = 8;
    csz__fixed_bl = 7;
    if ((i = csz__huft_build(l, 288, 257, cplens, cplext,
                        &csz__fixed_tl, &csz__fixed_bl)) != 0)
    {
      csz__fixed_tl = (struct huft *)NULL;
      return i;
    }

    /* distance table */
    for (i = 0; i < 30; i++)      /* make an incomplete code set */
      l[i] = 5;
    csz__fixed_bd = 5;
    if ((i = csz__huft_build(l, 30, 0, cpdist, cpdext, &csz__fixed_td, &csz__fixed_bd)) > 1)
    {
      csz__huft_free(csz__fixed_tl);
      csz__fixed_tl = (struct huft *)NULL;
      return i;
    }
  }


  /* decompress until an end-of-block code */
  return csz__Inflate_codes(csz__fixed_tl, csz__fixed_td, csz__fixed_bl, csz__fixed_bd) != 0;
}

int csz__Inflate_free ( void )

Definition at line 1118 of file inflate.c.

{
  if (csz__fixed_tl != (struct huft *)NULL)
  {
    csz__huft_free(csz__fixed_td);
    csz__huft_free(csz__fixed_tl);
    csz__fixed_td = csz__fixed_tl = (struct huft *)NULL;
  }
  return 0;
}

int csz__Inflate_stored ( void )

Definition at line 763 of file inflate.c.

{
  unsigned n;           /* number of bytes in block */
  unsigned w;           /* current window position */
  register ulg b;       /* bit buffer */
  register unsigned k;  /* number of bits in bit buffer */


  /* make local copies of globals */
  Trace((stderr, "\nstored block"));
  b = bb;                       /* initialize bit buffer */
  k = bk;
  w = wp;                       /* initialize window position */


  /* go to byte boundary */
  n = k & 7;
  DUMPBITS(n);


  /* get the length and its complement */
  NEEDBITS(16)
  n = ((unsigned)b & 0xffff);
  DUMPBITS(16)
  NEEDBITS(16)
  if (n != (unsigned)((~b) & 0xffff))
    return 1;                   /* error in compressed data */
  DUMPBITS(16)


  /* read and output the compressed data */
  while (n--)
  {
    NEEDBITS(8)
    csz__slide[w++] = (uch)b;
    if (w == WSIZE)
    {
      FLUSH(w);
      w = 0;
    }
    DUMPBITS(8)
  }


  /* restore the globals from the locals */
  wp = w;                       /* restore global window pointer */
  bb = b;                       /* restore global bit buffer */
  bk = k;
  return 0;
}

void csz__Init_Inflate	(	long	a_ibufcnt,
		unsigned char *	a_ibufptr,
		long	a_obufcnt,
		unsigned char *	a_obufptr
	)

Definition at line 1130 of file inflate.c.

                                                              {
  ibufcnt = a_ibufcnt;
  ibufptr = a_ibufptr;

  obufcnt = a_obufcnt;
  obufptr = a_obufptr;
}

unsigned char* csz__obufptr ( )

Definition at line 1138 of file inflate.c.