/* inflate.c -- zlib interface to inflate modules
|
/* inflate.c -- zlib interface to inflate modules
|
* Copyright (C) 1995-1998 Mark Adler
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* Copyright (C) 1995-1998 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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*/
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|
|
#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/zutil.h>
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#include <linux/zutil.h>
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#include "infblock.h"
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#include "infblock.h"
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#include "infutil.h"
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#include "infutil.h"
|
|
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int ZEXPORT zlib_inflate_workspacesize(void)
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int ZEXPORT zlib_inflate_workspacesize(void)
|
{
|
{
|
return sizeof(struct inflate_workspace);
|
return sizeof(struct inflate_workspace);
|
}
|
}
|
|
|
|
|
int ZEXPORT zlib_inflateReset(z)
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int ZEXPORT zlib_inflateReset(z)
|
z_streamp z;
|
z_streamp z;
|
{
|
{
|
if (z == Z_NULL || z->state == Z_NULL || z->workspace == Z_NULL)
|
if (z == Z_NULL || z->state == Z_NULL || z->workspace == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
z->total_in = z->total_out = 0;
|
z->total_in = z->total_out = 0;
|
z->msg = Z_NULL;
|
z->msg = Z_NULL;
|
z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
|
z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
|
zlib_inflate_blocks_reset(z->state->blocks, z, Z_NULL);
|
zlib_inflate_blocks_reset(z->state->blocks, z, Z_NULL);
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
int ZEXPORT zlib_inflateEnd(z)
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int ZEXPORT zlib_inflateEnd(z)
|
z_streamp z;
|
z_streamp z;
|
{
|
{
|
if (z == Z_NULL || z->state == Z_NULL || z->workspace == Z_NULL)
|
if (z == Z_NULL || z->state == Z_NULL || z->workspace == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
if (z->state->blocks != Z_NULL)
|
if (z->state->blocks != Z_NULL)
|
zlib_inflate_blocks_free(z->state->blocks, z);
|
zlib_inflate_blocks_free(z->state->blocks, z);
|
z->state = Z_NULL;
|
z->state = Z_NULL;
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
int ZEXPORT zlib_inflateInit2_(z, w, version, stream_size)
|
int ZEXPORT zlib_inflateInit2_(z, w, version, stream_size)
|
z_streamp z;
|
z_streamp z;
|
int w;
|
int w;
|
const char *version;
|
const char *version;
|
int stream_size;
|
int stream_size;
|
{
|
{
|
if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
|
if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
|
stream_size != sizeof(z_stream) || z->workspace == Z_NULL)
|
stream_size != sizeof(z_stream) || z->workspace == Z_NULL)
|
return Z_VERSION_ERROR;
|
return Z_VERSION_ERROR;
|
|
|
/* initialize state */
|
/* initialize state */
|
if (z == Z_NULL)
|
if (z == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
z->msg = Z_NULL;
|
z->msg = Z_NULL;
|
z->state = &WS(z)->internal_state;
|
z->state = &WS(z)->internal_state;
|
z->state->blocks = Z_NULL;
|
z->state->blocks = Z_NULL;
|
|
|
/* handle undocumented nowrap option (no zlib header or check) */
|
/* handle undocumented nowrap option (no zlib header or check) */
|
z->state->nowrap = 0;
|
z->state->nowrap = 0;
|
if (w < 0)
|
if (w < 0)
|
{
|
{
|
w = - w;
|
w = - w;
|
z->state->nowrap = 1;
|
z->state->nowrap = 1;
|
}
|
}
|
|
|
/* set window size */
|
/* set window size */
|
if (w < 8 || w > 15)
|
if (w < 8 || w > 15)
|
{
|
{
|
zlib_inflateEnd(z);
|
zlib_inflateEnd(z);
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
}
|
}
|
z->state->wbits = (uInt)w;
|
z->state->wbits = (uInt)w;
|
|
|
/* create inflate_blocks state */
|
/* create inflate_blocks state */
|
if ((z->state->blocks =
|
if ((z->state->blocks =
|
zlib_inflate_blocks_new(z, z->state->nowrap ? Z_NULL : zlib_adler32, (uInt)1 << w))
|
zlib_inflate_blocks_new(z, z->state->nowrap ? Z_NULL : zlib_adler32, (uInt)1 << w))
|
== Z_NULL)
|
== Z_NULL)
|
{
|
{
|
zlib_inflateEnd(z);
|
zlib_inflateEnd(z);
|
return Z_MEM_ERROR;
|
return Z_MEM_ERROR;
|
}
|
}
|
|
|
/* reset state */
|
/* reset state */
|
zlib_inflateReset(z);
|
zlib_inflateReset(z);
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
* At the end of a Deflate-compressed PPP packet, we expect to have seen
|
* At the end of a Deflate-compressed PPP packet, we expect to have seen
|
* a `stored' block type value but not the (zero) length bytes.
|
* a `stored' block type value but not the (zero) length bytes.
|
*/
|
*/
|
static int zlib_inflate_packet_flush(inflate_blocks_statef *s)
|
static int zlib_inflate_packet_flush(inflate_blocks_statef *s)
|
{
|
{
|
if (s->mode != LENS)
|
if (s->mode != LENS)
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
s->mode = TYPE;
|
s->mode = TYPE;
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
int ZEXPORT zlib_inflateInit_(z, version, stream_size)
|
int ZEXPORT zlib_inflateInit_(z, version, stream_size)
|
z_streamp z;
|
z_streamp z;
|
const char *version;
|
const char *version;
|
int stream_size;
|
int stream_size;
|
{
|
{
|
return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size);
|
return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size);
|
}
|
}
|
|
|
#undef NEEDBYTE
|
#undef NEEDBYTE
|
#undef NEXTBYTE
|
#undef NEXTBYTE
|
#define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;}
|
#define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;}
|
#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
|
#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
|
|
|
int ZEXPORT zlib_inflate(z, f)
|
int ZEXPORT zlib_inflate(z, f)
|
z_streamp z;
|
z_streamp z;
|
int f;
|
int f;
|
{
|
{
|
int r, trv;
|
int r, trv;
|
uInt b;
|
uInt b;
|
|
|
if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
|
if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
|
trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
|
r = Z_BUF_ERROR;
|
r = Z_BUF_ERROR;
|
while (1) switch (z->state->mode)
|
while (1) switch (z->state->mode)
|
{
|
{
|
case METHOD:
|
case METHOD:
|
NEEDBYTE
|
NEEDBYTE
|
if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
|
if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char*)"unknown compression method";
|
z->msg = (char*)"unknown compression method";
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
break;
|
break;
|
}
|
}
|
if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
|
if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char*)"invalid window size";
|
z->msg = (char*)"invalid window size";
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
break;
|
break;
|
}
|
}
|
z->state->mode = FLAG;
|
z->state->mode = FLAG;
|
case FLAG:
|
case FLAG:
|
NEEDBYTE
|
NEEDBYTE
|
b = NEXTBYTE;
|
b = NEXTBYTE;
|
if (((z->state->sub.method << 8) + b) % 31)
|
if (((z->state->sub.method << 8) + b) % 31)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char*)"incorrect header check";
|
z->msg = (char*)"incorrect header check";
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
break;
|
break;
|
}
|
}
|
if (!(b & PRESET_DICT))
|
if (!(b & PRESET_DICT))
|
{
|
{
|
z->state->mode = BLOCKS;
|
z->state->mode = BLOCKS;
|
break;
|
break;
|
}
|
}
|
z->state->mode = DICT4;
|
z->state->mode = DICT4;
|
case DICT4:
|
case DICT4:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
|
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
|
z->state->mode = DICT3;
|
z->state->mode = DICT3;
|
case DICT3:
|
case DICT3:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
|
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
|
z->state->mode = DICT2;
|
z->state->mode = DICT2;
|
case DICT2:
|
case DICT2:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
|
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
|
z->state->mode = DICT1;
|
z->state->mode = DICT1;
|
case DICT1:
|
case DICT1:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE;
|
z->state->sub.check.need += (uLong)NEXTBYTE;
|
z->adler = z->state->sub.check.need;
|
z->adler = z->state->sub.check.need;
|
z->state->mode = DICT0;
|
z->state->mode = DICT0;
|
return Z_NEED_DICT;
|
return Z_NEED_DICT;
|
case DICT0:
|
case DICT0:
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char*)"need dictionary";
|
z->msg = (char*)"need dictionary";
|
z->state->sub.marker = 0; /* can try inflateSync */
|
z->state->sub.marker = 0; /* can try inflateSync */
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
case BLOCKS:
|
case BLOCKS:
|
r = zlib_inflate_blocks(z->state->blocks, z, r);
|
r = zlib_inflate_blocks(z->state->blocks, z, r);
|
if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
|
if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
|
r = zlib_inflate_packet_flush(z->state->blocks);
|
r = zlib_inflate_packet_flush(z->state->blocks);
|
if (r == Z_DATA_ERROR)
|
if (r == Z_DATA_ERROR)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->state->sub.marker = 0; /* can try inflateSync */
|
z->state->sub.marker = 0; /* can try inflateSync */
|
break;
|
break;
|
}
|
}
|
if (r == Z_OK)
|
if (r == Z_OK)
|
r = trv;
|
r = trv;
|
if (r != Z_STREAM_END)
|
if (r != Z_STREAM_END)
|
return r;
|
return r;
|
r = trv;
|
r = trv;
|
zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
|
zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
|
if (z->state->nowrap)
|
if (z->state->nowrap)
|
{
|
{
|
z->state->mode = I_DONE;
|
z->state->mode = I_DONE;
|
break;
|
break;
|
}
|
}
|
z->state->mode = CHECK4;
|
z->state->mode = CHECK4;
|
case CHECK4:
|
case CHECK4:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
|
z->state->sub.check.need = (uLong)NEXTBYTE << 24;
|
z->state->mode = CHECK3;
|
z->state->mode = CHECK3;
|
case CHECK3:
|
case CHECK3:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
|
z->state->sub.check.need += (uLong)NEXTBYTE << 16;
|
z->state->mode = CHECK2;
|
z->state->mode = CHECK2;
|
case CHECK2:
|
case CHECK2:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
|
z->state->sub.check.need += (uLong)NEXTBYTE << 8;
|
z->state->mode = CHECK1;
|
z->state->mode = CHECK1;
|
case CHECK1:
|
case CHECK1:
|
NEEDBYTE
|
NEEDBYTE
|
z->state->sub.check.need += (uLong)NEXTBYTE;
|
z->state->sub.check.need += (uLong)NEXTBYTE;
|
|
|
if (z->state->sub.check.was != z->state->sub.check.need)
|
if (z->state->sub.check.was != z->state->sub.check.need)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char*)"incorrect data check";
|
z->msg = (char*)"incorrect data check";
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
z->state->sub.marker = 5; /* can't try inflateSync */
|
break;
|
break;
|
}
|
}
|
z->state->mode = I_DONE;
|
z->state->mode = I_DONE;
|
case I_DONE:
|
case I_DONE:
|
return Z_STREAM_END;
|
return Z_STREAM_END;
|
case I_BAD:
|
case I_BAD:
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
default:
|
default:
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
}
|
}
|
empty:
|
empty:
|
if (f != Z_PACKET_FLUSH)
|
if (f != Z_PACKET_FLUSH)
|
return r;
|
return r;
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->msg = (char *)"need more for packet flush";
|
z->msg = (char *)"need more for packet flush";
|
z->state->sub.marker = 0; /* can try inflateSync */
|
z->state->sub.marker = 0; /* can try inflateSync */
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
}
|
}
|
|
|
|
|
int ZEXPORT zlib_inflateSync(z)
|
int ZEXPORT zlib_inflateSync(z)
|
z_streamp z;
|
z_streamp z;
|
{
|
{
|
uInt n; /* number of bytes to look at */
|
uInt n; /* number of bytes to look at */
|
Bytef *p; /* pointer to bytes */
|
Bytef *p; /* pointer to bytes */
|
uInt m; /* number of marker bytes found in a row */
|
uInt m; /* number of marker bytes found in a row */
|
uLong r, w; /* temporaries to save total_in and total_out */
|
uLong r, w; /* temporaries to save total_in and total_out */
|
|
|
/* set up */
|
/* set up */
|
if (z == Z_NULL || z->state == Z_NULL)
|
if (z == Z_NULL || z->state == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
if (z->state->mode != I_BAD)
|
if (z->state->mode != I_BAD)
|
{
|
{
|
z->state->mode = I_BAD;
|
z->state->mode = I_BAD;
|
z->state->sub.marker = 0;
|
z->state->sub.marker = 0;
|
}
|
}
|
if ((n = z->avail_in) == 0)
|
if ((n = z->avail_in) == 0)
|
return Z_BUF_ERROR;
|
return Z_BUF_ERROR;
|
p = z->next_in;
|
p = z->next_in;
|
m = z->state->sub.marker;
|
m = z->state->sub.marker;
|
|
|
/* search */
|
/* search */
|
while (n && m < 4)
|
while (n && m < 4)
|
{
|
{
|
static const Byte mark[4] = {0, 0, 0xff, 0xff};
|
static const Byte mark[4] = {0, 0, 0xff, 0xff};
|
if (*p == mark[m])
|
if (*p == mark[m])
|
m++;
|
m++;
|
else if (*p)
|
else if (*p)
|
m = 0;
|
m = 0;
|
else
|
else
|
m = 4 - m;
|
m = 4 - m;
|
p++, n--;
|
p++, n--;
|
}
|
}
|
|
|
/* restore */
|
/* restore */
|
z->total_in += p - z->next_in;
|
z->total_in += p - z->next_in;
|
z->next_in = p;
|
z->next_in = p;
|
z->avail_in = n;
|
z->avail_in = n;
|
z->state->sub.marker = m;
|
z->state->sub.marker = m;
|
|
|
/* return no joy or set up to restart on a new block */
|
/* return no joy or set up to restart on a new block */
|
if (m != 4)
|
if (m != 4)
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
r = z->total_in; w = z->total_out;
|
r = z->total_in; w = z->total_out;
|
zlib_inflateReset(z);
|
zlib_inflateReset(z);
|
z->total_in = r; z->total_out = w;
|
z->total_in = r; z->total_out = w;
|
z->state->mode = BLOCKS;
|
z->state->mode = BLOCKS;
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
/* Returns true if inflate is currently at the end of a block generated
|
/* Returns true if inflate is currently at the end of a block generated
|
* by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
|
* by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
|
* implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
|
* implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
|
* but removes the length bytes of the resulting empty stored block. When
|
* but removes the length bytes of the resulting empty stored block. When
|
* decompressing, PPP checks that at the end of input packet, inflate is
|
* decompressing, PPP checks that at the end of input packet, inflate is
|
* waiting for these length bytes.
|
* waiting for these length bytes.
|
*/
|
*/
|
int ZEXPORT zlib_inflateSyncPoint(z)
|
int ZEXPORT zlib_inflateSyncPoint(z)
|
z_streamp z;
|
z_streamp z;
|
{
|
{
|
if (z == Z_NULL || z->state == Z_NULL || z->state->blocks == Z_NULL)
|
if (z == Z_NULL || z->state == Z_NULL || z->state->blocks == Z_NULL)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
return zlib_inflate_blocks_sync_point(z->state->blocks);
|
return zlib_inflate_blocks_sync_point(z->state->blocks);
|
}
|
}
|
|
|
/*
|
/*
|
* This subroutine adds the data at next_in/avail_in to the output history
|
* This subroutine adds the data at next_in/avail_in to the output history
|
* without performing any output. The output buffer must be "caught up";
|
* without performing any output. The output buffer must be "caught up";
|
* i.e. no pending output (hence s->read equals s->write), and the state must
|
* i.e. no pending output (hence s->read equals s->write), and the state must
|
* be BLOCKS (i.e. we should be willing to see the start of a series of
|
* be BLOCKS (i.e. we should be willing to see the start of a series of
|
* BLOCKS). On exit, the output will also be caught up, and the checksum
|
* BLOCKS). On exit, the output will also be caught up, and the checksum
|
* will have been updated if need be.
|
* will have been updated if need be.
|
*/
|
*/
|
static int zlib_inflate_addhistory(inflate_blocks_statef *s,
|
static int zlib_inflate_addhistory(inflate_blocks_statef *s,
|
z_stream *z)
|
z_stream *z)
|
{
|
{
|
uLong b; /* bit buffer */ /* NOT USED HERE */
|
uLong b; /* bit buffer */ /* NOT USED HERE */
|
uInt k; /* bits in bit buffer */ /* NOT USED HERE */
|
uInt k; /* bits in bit buffer */ /* NOT USED HERE */
|
uInt t; /* temporary storage */
|
uInt t; /* temporary storage */
|
Bytef *p; /* input data pointer */
|
Bytef *p; /* input data pointer */
|
uInt n; /* bytes available there */
|
uInt n; /* bytes available there */
|
Bytef *q; /* output window write pointer */
|
Bytef *q; /* output window write pointer */
|
uInt m; /* bytes to end of window or read pointer */
|
uInt m; /* bytes to end of window or read pointer */
|
|
|
if (s->read != s->write)
|
if (s->read != s->write)
|
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
if (s->mode != TYPE)
|
if (s->mode != TYPE)
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
|
|
/* we're ready to rock */
|
/* we're ready to rock */
|
LOAD
|
LOAD
|
/* while there is input ready, copy to output buffer, moving
|
/* while there is input ready, copy to output buffer, moving
|
* pointers as needed.
|
* pointers as needed.
|
*/
|
*/
|
while (n) {
|
while (n) {
|
t = n; /* how many to do */
|
t = n; /* how many to do */
|
/* is there room until end of buffer? */
|
/* is there room until end of buffer? */
|
if (t > m) t = m;
|
if (t > m) t = m;
|
/* update check information */
|
/* update check information */
|
if (s->checkfn != Z_NULL)
|
if (s->checkfn != Z_NULL)
|
s->check = (*s->checkfn)(s->check, q, t);
|
s->check = (*s->checkfn)(s->check, q, t);
|
memcpy(q, p, t);
|
memcpy(q, p, t);
|
q += t;
|
q += t;
|
p += t;
|
p += t;
|
n -= t;
|
n -= t;
|
z->total_out += t;
|
z->total_out += t;
|
s->read = q; /* drag read pointer forward */
|
s->read = q; /* drag read pointer forward */
|
/* WWRAP */ /* expand WWRAP macro by hand to handle s->read */
|
/* WWRAP */ /* expand WWRAP macro by hand to handle s->read */
|
if (q == s->end) {
|
if (q == s->end) {
|
s->read = q = s->window;
|
s->read = q = s->window;
|
m = WAVAIL;
|
m = WAVAIL;
|
}
|
}
|
}
|
}
|
UPDATE
|
UPDATE
|
return Z_OK;
|
return Z_OK;
|
}
|
}
|
|
|
|
|
/*
|
/*
|
* This subroutine adds the data at next_in/avail_in to the output history
|
* This subroutine adds the data at next_in/avail_in to the output history
|
* without performing any output. The output buffer must be "caught up";
|
* without performing any output. The output buffer must be "caught up";
|
* i.e. no pending output (hence s->read equals s->write), and the state must
|
* i.e. no pending output (hence s->read equals s->write), and the state must
|
* be BLOCKS (i.e. we should be willing to see the start of a series of
|
* be BLOCKS (i.e. we should be willing to see the start of a series of
|
* BLOCKS). On exit, the output will also be caught up, and the checksum
|
* BLOCKS). On exit, the output will also be caught up, and the checksum
|
* will have been updated if need be.
|
* will have been updated if need be.
|
*/
|
*/
|
|
|
int ZEXPORT zlib_inflateIncomp(z)
|
int ZEXPORT zlib_inflateIncomp(z)
|
z_stream *z;
|
z_stream *z;
|
{
|
{
|
if (z->state->mode != BLOCKS)
|
if (z->state->mode != BLOCKS)
|
return Z_DATA_ERROR;
|
return Z_DATA_ERROR;
|
return zlib_inflate_addhistory(z->state->blocks, z);
|
return zlib_inflate_addhistory(z->state->blocks, z);
|
}
|
}
|
|
|
