mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-10 21:38:50 +01:00
c0c2c58054
to libgcrypt functions, using shared error codes from libgpg-error, replacing the old functions we used to have in ../util by those in ../jnlib and ../common, renaming the malloc functions and a couple of types. Note, that not all changes are listed below becuause they are too similar and done at far too many places. As of today the code builds using the current libgcrypt from CVS but it is very unlikely that it actually works.
330 lines
8.8 KiB
C
330 lines
8.8 KiB
C
/* compress.c - compress filter
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002,
|
|
* 2003 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <zlib.h>
|
|
#ifdef __riscos__
|
|
# include "zlib-riscos.h"
|
|
#endif
|
|
|
|
#include "gpg.h"
|
|
#include "util.h"
|
|
#include "memory.h"
|
|
#include "packet.h"
|
|
#include "filter.h"
|
|
#include "main.h"
|
|
#include "options.h"
|
|
|
|
static void
|
|
init_compress( compress_filter_context_t *zfx, z_stream *zs )
|
|
{
|
|
int rc;
|
|
int level;
|
|
|
|
#ifdef __riscos__
|
|
static int zlib_initialized = 0;
|
|
|
|
if (!zlib_initialized)
|
|
zlib_initialized = riscos_load_module("ZLib", zlib_path, 1);
|
|
#endif
|
|
|
|
if( opt.compress >= 0 && opt.compress <= 9 )
|
|
level = opt.compress;
|
|
else if( opt.compress == -1 )
|
|
level = Z_DEFAULT_COMPRESSION;
|
|
else if( opt.compress == 10 ) /* remove this ! */
|
|
level = 0;
|
|
else {
|
|
log_error("invalid compression level; using default level\n");
|
|
level = Z_DEFAULT_COMPRESSION;
|
|
}
|
|
|
|
|
|
if( (rc = zfx->algo == 1? deflateInit2( zs, level, Z_DEFLATED,
|
|
-13, 8, Z_DEFAULT_STRATEGY)
|
|
: deflateInit( zs, level )
|
|
) != Z_OK ) {
|
|
log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
|
|
rc == Z_MEM_ERROR ? "out of core" :
|
|
rc == Z_VERSION_ERROR ? "invalid lib version" :
|
|
"unknown error" );
|
|
}
|
|
|
|
zfx->outbufsize = 8192;
|
|
zfx->outbuf = xmalloc ( zfx->outbufsize );
|
|
}
|
|
|
|
static int
|
|
do_compress( compress_filter_context_t *zfx, z_stream *zs, int flush, iobuf_t a )
|
|
{
|
|
gpg_error_t rc;
|
|
int zrc;
|
|
unsigned n;
|
|
|
|
do {
|
|
#ifndef __riscos__
|
|
zs->next_out = zfx->outbuf;
|
|
#else /* __riscos__ */
|
|
zs->next_out = (Bytef *) zfx->outbuf;
|
|
#endif /* __riscos__ */
|
|
zs->avail_out = zfx->outbufsize;
|
|
if( DBG_FILTER )
|
|
log_debug("enter deflate: avail_in=%u, avail_out=%u, flush=%d\n",
|
|
(unsigned)zs->avail_in, (unsigned)zs->avail_out, flush );
|
|
zrc = deflate( zs, flush );
|
|
if( zrc == Z_STREAM_END && flush == Z_FINISH )
|
|
;
|
|
else if( zrc != Z_OK ) {
|
|
if( zs->msg )
|
|
log_fatal("zlib deflate problem: %s\n", zs->msg );
|
|
else
|
|
log_fatal("zlib deflate problem: rc=%d\n", zrc );
|
|
}
|
|
n = zfx->outbufsize - zs->avail_out;
|
|
if( DBG_FILTER )
|
|
log_debug("leave deflate: "
|
|
"avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
|
|
(unsigned)zs->avail_in, (unsigned)zs->avail_out,
|
|
(unsigned)n, zrc );
|
|
|
|
rc = iobuf_write (a, zfx->outbuf, n);
|
|
if (rc)
|
|
{
|
|
log_debug("deflate: iobuf_write failed\n");
|
|
return rc;
|
|
}
|
|
} while( zs->avail_in || (flush == Z_FINISH && zrc != Z_STREAM_END) );
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
init_uncompress( compress_filter_context_t *zfx, z_stream *zs )
|
|
{
|
|
int rc;
|
|
|
|
/****************
|
|
* PGP uses a windowsize of 13 bits. Using a negative value for
|
|
* it forces zlib not to expect a zlib header. This is a
|
|
* undocumented feature Peter Gutmann told me about.
|
|
*
|
|
* We must use 15 bits for the inflator because CryptoEx uses 15
|
|
* bits thus the output would get scrambled w/o error indication
|
|
* if we would use 13 bits. For the uncompressing this does not
|
|
* matter at all.
|
|
*/
|
|
if( (rc = zfx->algo == 1? inflateInit2( zs, -15)
|
|
: inflateInit( zs )) != Z_OK ) {
|
|
log_fatal("zlib problem: %s\n", zs->msg? zs->msg :
|
|
rc == Z_MEM_ERROR ? "out of core" :
|
|
rc == Z_VERSION_ERROR ? "invalid lib version" :
|
|
"unknown error" );
|
|
}
|
|
|
|
zfx->inbufsize = 2048;
|
|
zfx->inbuf = xmalloc ( zfx->inbufsize );
|
|
zs->avail_in = 0;
|
|
}
|
|
|
|
static int
|
|
do_uncompress( compress_filter_context_t *zfx, z_stream *zs,
|
|
iobuf_t a, size_t *ret_len )
|
|
{
|
|
int zrc;
|
|
int rc=0;
|
|
size_t n;
|
|
int nread, count;
|
|
int refill = !zs->avail_in;
|
|
|
|
if( DBG_FILTER )
|
|
log_debug("begin inflate: avail_in=%u, avail_out=%u, inbuf=%u\n",
|
|
(unsigned)zs->avail_in, (unsigned)zs->avail_out,
|
|
(unsigned)zfx->inbufsize );
|
|
do {
|
|
if( zs->avail_in < zfx->inbufsize && refill ) {
|
|
n = zs->avail_in;
|
|
if( !n )
|
|
#ifndef __riscos__
|
|
zs->next_in = zfx->inbuf;
|
|
#else /* __riscos__ */
|
|
zs->next_in = (Bytef *) zfx->inbuf;
|
|
#endif /* __riscos__ */
|
|
count = zfx->inbufsize - n;
|
|
nread = iobuf_read( a, zfx->inbuf + n, count );
|
|
if( nread == -1 ) nread = 0;
|
|
n += nread;
|
|
/* If we use the undocumented feature to suppress
|
|
* the zlib header, we have to give inflate an
|
|
* extra dummy byte to read */
|
|
if( nread < count && zfx->algo == 1 ) {
|
|
*(zfx->inbuf + n) = 0xFF; /* is it really needed ? */
|
|
zfx->algo1hack = 1;
|
|
n++;
|
|
}
|
|
zs->avail_in = n;
|
|
}
|
|
refill = 1;
|
|
if( DBG_FILTER )
|
|
log_debug("enter inflate: avail_in=%u, avail_out=%u\n",
|
|
(unsigned)zs->avail_in, (unsigned)zs->avail_out);
|
|
#ifdef Z_SYNC_FLUSH
|
|
zrc = inflate( zs, Z_SYNC_FLUSH );
|
|
#else
|
|
zrc = inflate( zs, Z_PARTIAL_FLUSH );
|
|
#endif
|
|
if( DBG_FILTER )
|
|
log_debug("leave inflate: avail_in=%u, avail_out=%u, zrc=%d\n",
|
|
(unsigned)zs->avail_in, (unsigned)zs->avail_out, zrc);
|
|
if( zrc == Z_STREAM_END )
|
|
rc = -1; /* eof */
|
|
else if( zrc != Z_OK && zrc != Z_BUF_ERROR ) {
|
|
if( zs->msg )
|
|
log_fatal("zlib inflate problem: %s\n", zs->msg );
|
|
else
|
|
log_fatal("zlib inflate problem: rc=%d\n", zrc );
|
|
}
|
|
} while( zs->avail_out && zrc != Z_STREAM_END && zrc != Z_BUF_ERROR );
|
|
*ret_len = zfx->outbufsize - zs->avail_out;
|
|
if( DBG_FILTER )
|
|
log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
compress_filter( void *opaque, int control,
|
|
iobuf_t a, byte *buf, size_t *ret_len)
|
|
{
|
|
size_t size = *ret_len;
|
|
compress_filter_context_t *zfx = opaque;
|
|
z_stream *zs = zfx->opaque;
|
|
int rc=0;
|
|
|
|
if( control == IOBUFCTRL_UNDERFLOW ) {
|
|
if( !zfx->status ) {
|
|
zs = zfx->opaque = xcalloc (1, sizeof *zs );
|
|
init_uncompress( zfx, zs );
|
|
zfx->status = 1;
|
|
}
|
|
|
|
#ifndef __riscos__
|
|
zs->next_out = buf;
|
|
#else /* __riscos__ */
|
|
zs->next_out = (Bytef *) buf;
|
|
#endif /* __riscos__ */
|
|
zs->avail_out = size;
|
|
zfx->outbufsize = size; /* needed only for calculation */
|
|
rc = do_uncompress( zfx, zs, a, ret_len );
|
|
}
|
|
else if( control == IOBUFCTRL_FLUSH ) {
|
|
if( !zfx->status ) {
|
|
PACKET pkt;
|
|
PKT_compressed cd;
|
|
|
|
if( !zfx->algo )
|
|
zfx->algo = DEFAULT_COMPRESS_ALGO;
|
|
if( zfx->algo != 1 && zfx->algo != 2 )
|
|
BUG();
|
|
memset( &cd, 0, sizeof cd );
|
|
cd.len = 0;
|
|
cd.algorithm = zfx->algo;
|
|
init_packet( &pkt );
|
|
pkt.pkttype = PKT_COMPRESSED;
|
|
pkt.pkt.compressed = &cd;
|
|
if( build_packet( a, &pkt ))
|
|
log_bug("build_packet(PKT_COMPRESSED) failed\n");
|
|
zs = zfx->opaque = xcalloc (1, sizeof *zs );
|
|
init_compress( zfx, zs );
|
|
zfx->status = 2;
|
|
}
|
|
|
|
#ifndef __riscos__
|
|
zs->next_in = buf;
|
|
#else /* __riscos__ */
|
|
zs->next_in = (Bytef *) buf;
|
|
#endif /* __riscos__ */
|
|
zs->avail_in = size;
|
|
rc = do_compress( zfx, zs, Z_NO_FLUSH, a );
|
|
}
|
|
else if( control == IOBUFCTRL_FREE ) {
|
|
if( zfx->status == 1 ) {
|
|
inflateEnd(zs);
|
|
xfree (zs);
|
|
zfx->opaque = NULL;
|
|
xfree (zfx->outbuf); zfx->outbuf = NULL;
|
|
}
|
|
else if( zfx->status == 2 ) {
|
|
#ifndef __riscos__
|
|
zs->next_in = buf;
|
|
#else /* __riscos__ */
|
|
zs->next_in = (Bytef *) buf;
|
|
#endif /* __riscos__ */
|
|
zs->avail_in = 0;
|
|
do_compress( zfx, zs, Z_FINISH, a );
|
|
deflateEnd(zs);
|
|
xfree (zs);
|
|
zfx->opaque = NULL;
|
|
xfree (zfx->outbuf); zfx->outbuf = NULL;
|
|
}
|
|
if (zfx->release)
|
|
zfx->release (zfx);
|
|
}
|
|
else if( control == IOBUFCTRL_DESC )
|
|
*(char**)buf = "compress_filter";
|
|
return rc;
|
|
}
|
|
|
|
|
|
static void
|
|
release_context (compress_filter_context_t *ctx)
|
|
{
|
|
xfree (ctx);
|
|
}
|
|
|
|
/****************
|
|
* Handle a compressed packet
|
|
*/
|
|
int
|
|
handle_compressed( void *procctx, PKT_compressed *cd,
|
|
int (*callback)(iobuf_t, void *), void *passthru )
|
|
{
|
|
compress_filter_context_t *cfx;
|
|
int rc;
|
|
|
|
if( cd->algorithm < 1 || cd->algorithm > 2 )
|
|
return GPG_ERR_COMPR_ALGO;
|
|
cfx = xcalloc (1,sizeof *cfx);
|
|
cfx->algo = cd->algorithm;
|
|
cfx->release = release_context;
|
|
iobuf_push_filter( cd->buf, compress_filter, cfx );
|
|
if( callback )
|
|
rc = callback(cd->buf, passthru );
|
|
else
|
|
rc = proc_packets(procctx, cd->buf);
|
|
cd->buf = NULL;
|
|
return rc;
|
|
}
|
|
|