/* inflate.c -- zlib decompression
- * Copyright (C) 1995-2012 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
state->mode = HEAD;
state->last = 0;
state->havedict = 0;
+ state->flags = -1;
state->dmax = 32768U;
state->head = Z_NULL;
state->hold = 0;
state->mode = FLAGS;
break;
}
- state->flags = 0; /* expect zlib header */
if (state->head != Z_NULL)
state->head->done = -1;
if (!(state->wrap & 1) || /* check if zlib header allowed */
break;
}
state->dmax = 1U << len;
+ state->flags = 0; /* indicate zlib header */
Tracev((stderr, "inflate: zlib header ok\n"));
strm->adler = state->check = adler32(0L, Z_NULL, 0);
state->mode = hold & 0x200 ? DICTID : TYPE;
case LENGTH:
if (state->wrap && state->flags) {
NEEDBITS(32);
- if (hold != (state->total & 0xffffffffUL)) {
+ if ((state->wrap & 4) && hold != (state->total & 0xffffffff)) {
strm->msg = (char *)"incorrect length check";
state->mode = BAD;
break;
z_streamp strm;
{
unsigned len; /* number of bytes to look at or looked at */
+ int flags; /* temporary to save header status */
unsigned long in, out; /* temporary to save total_in and total_out */
unsigned char buf[4]; /* to restore bit buffer to byte string */
struct inflate_state FAR *state;
/* return no joy or set up to restart inflate() on a new block */
if (state->have != 4) return Z_DATA_ERROR;
+ if (state->flags == -1)
+ state->wrap = 0; /* if no header yet, treat as raw */
+ else
+ state->wrap &= ~4; /* no point in computing a check value now */
+ flags = state->flags;
in = strm->total_in; out = strm->total_out;
inflateReset(strm);
strm->total_in = in; strm->total_out = out;
+ state->flags = flags;
state->mode = TYPE;
return Z_OK;
}
if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
state = (struct inflate_state FAR *)strm->state;
- if (check)
+ if (check && state->wrap)
state->wrap |= 4;
else
state->wrap &= ~4;
z_streamp strm;
{
struct inflate_state FAR *state;
- if (inflateStateCheck(strm)) return (unsigned long)0 - 1;
+ if (inflateStateCheck(strm)) return (unsigned long)-1;
state = (struct inflate_state FAR *)strm->state;
return (unsigned long)(state->next - state->codes);
}