zlib/infutil.c

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

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

struct inflate_codes_state {int dummy;}; /* for buggy compilers */

/* And'ing with mask[n] masks the lower n bits */
uInt inflate_mask[] = {
    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 */
int inflate_flush(s, z, r)
struct inflate_blocks_state *s;
z_stream *z;
int r;
{
  uInt n;
  Byte *p, *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 = (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 */
  s->check = adler32(s->check, q, n);

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

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

    /* compute bytes to copy */
    n = 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 */
    s->check = adler32(s->check, q, n);

    /* copy */
    while (n--) *p++ = *q++;
  }

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

  /* done */
  return r;
}