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-rw-r--r--g10/compress.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/g10/compress.c b/g10/compress.c
new file mode 100644
index 000000000..a4fc48f88
--- /dev/null
+++ b/g10/compress.c
@@ -0,0 +1,253 @@
+/* compress.c - compress filter
+ * Copyright (c) 1997 by Werner Koch (dd9jn)
+ *
+ * This file is part of G10.
+ *
+ * G10 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.
+ *
+ * G10 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>
+#ifdef HAVE_ZLIB_H
+ #include <zlib.h>
+#else
+ #error You need ZLIB to compile this module
+#endif
+
+#include "util.h"
+#include "memory.h"
+#include "packet.h"
+#include "filter.h"
+#include "options.h"
+
+
+static void
+init_compress( compress_filter_context_t *zfx, z_stream *zs )
+{
+ int rc;
+ byte *inbuf, *outbuf;
+ int level;
+
+
+ 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 = 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 = 4096;
+ zfx->outbuf = m_alloc( zfx->outbufsize );
+}
+
+static int
+do_compress( compress_filter_context_t *zfx, z_stream *zs, int flush, IOBUF a )
+{
+ int zrc;
+ unsigned n;
+
+ do {
+ zs->next_out = zfx->outbuf;
+ zs->avail_out = zfx->outbufsize;
+ 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("deflate returned: avail_in=%u, avail_out=%u, n=%u\n",
+ (unsigned)zs->avail_in, (unsigned)zs->avail_out, (unsigned)n );
+
+ if( iobuf_write( a, zfx->outbuf, n ) ) {
+ log_debug("deflate: iobuf_write failed\n");
+ return G10ERR_WRITE_FILE;
+ }
+ } 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;
+ byte *inbuf, *outbuf;
+ int level;
+
+
+ if( (rc = 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 = 1024;
+ zfx->inbuf = m_alloc( zfx->inbufsize );
+ zs->avail_in = 0;
+}
+
+static int
+do_uncompress( compress_filter_context_t *zfx, z_stream *zs,
+ IOBUF a, size_t *ret_len )
+{
+ int zrc;
+ size_t n;
+ byte *p;
+ int c;
+
+ if( DBG_FILTER )
+ log_debug("do_uncompress: avail_in=%u, avail_out=%u\n",
+ (unsigned)zs->avail_in, (unsigned)zs->avail_out);
+ do {
+ if( zs->avail_in < zfx->inbufsize ) {
+ n = zs->avail_in;
+ if( !n )
+ zs->next_in = zfx->inbuf;
+ for( p=zfx->inbuf+n; n < zfx->inbufsize; n++, p++ ) {
+ if( (c=iobuf_get(a)) == -1 )
+ break;
+ *p = c & 0xff;
+ }
+ zs->avail_in = n;
+ }
+ zrc = inflate( zs, Z_PARTIAL_FLUSH );
+ if( DBG_FILTER )
+ log_debug("inflate returned: avail_in=%u, avail_out=%u, zrc=%d\n",
+ (unsigned)zs->avail_in, (unsigned)zs->avail_out, zrc);
+ if( zrc != Z_OK && zrc != Z_STREAM_END ) {
+ 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 );
+ *ret_len = zfx->outbufsize - zs->avail_out;
+ if( DBG_FILTER )
+ log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
+ return 0;
+}
+
+
+int
+compress_filter( void *opaque, int control,
+ IOBUF a, byte *buf, size_t *ret_len)
+{
+ size_t size = *ret_len;
+ compress_filter_context_t *zfx = opaque;
+ z_stream *zs = zfx->opaque;
+ int zrc, rc=0;
+
+ if( control == IOBUFCTRL_UNDERFLOW ) {
+ if( !zfx->status ) {
+ zs = zfx->opaque = m_alloc_clear( sizeof *zs );
+ init_uncompress( zfx, zs );
+ zfx->status = 1;
+ }
+
+ zs->next_out = buf;
+ 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;
+
+ memset( &cd, 0, sizeof cd );
+ cd.len = 0;
+ cd.algorithm = 2; /* zlib */
+ init_packet( &pkt );
+ pkt.pkttype = PKT_COMPR_DATA;
+ pkt.pkt.compressed = &cd;
+ if( build_packet( a, &pkt ))
+ log_bug("build_packet(COMPRESSED) failed\n");
+ zs = zfx->opaque = m_alloc_clear( sizeof *zs );
+ init_compress( zfx, zs );
+ zfx->status = 2;
+ }
+
+ zs->next_in = buf;
+ zs->avail_in = size;
+ rc = do_compress( zfx, zs, Z_NO_FLUSH, a );
+ }
+ else if( control == IOBUFCTRL_FREE ) {
+ if( zfx->status == 1 ) {
+ inflateEnd(zs);
+ m_free(zs);
+ zfx->opaque = NULL;
+ m_free(zfx->outbuf); zfx->outbuf = NULL;
+ }
+ else if( zfx->status == 2 ) {
+ zs->next_in = buf;
+ zs->avail_in = 0;
+ do_compress( zfx, zs, Z_FINISH, a );
+ deflateEnd(zs);
+ m_free(zs);
+ zfx->opaque = NULL;
+ m_free(zfx->outbuf); zfx->outbuf = NULL;
+ }
+ }
+ else if( control == IOBUFCTRL_DESC )
+ *(char**)buf = "compress_filter";
+ return rc;
+}
+
+/****************
+ * Handle a compressed packet
+ */
+int
+handle_compressed( PKT_compressed *cd )
+{
+ compress_filter_context_t cfx;
+
+ memset( &cfx, 0, sizeof cfx );
+ if( cd->algorithm != 2 )
+ return G10ERR_COMPR_ALGO;
+
+ iobuf_push_filter( cd->buf, compress_filter, &cfx );
+ proc_packets(cd->buf);
+ iobuf_pop_filter( cd->buf, compress_filter, &cfx );
+ #if 0
+ if( cd->len )
+ iobuf_set_limit( cd->buf, 0 ); /* disable the readlimit */
+ else
+ iobuf_clear_eof( cd->buf );
+ #endif
+ cd->buf = NULL;
+ return 0;
+}
+
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