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-rw-r--r--g10/compress-bz2.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/g10/compress-bz2.c b/g10/compress-bz2.c
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+/* compress.c - bzip2 compress filter
+ * Copyright (C) 2003, 2004 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <string.h>
+#include <stdio.h> /* Early versions of bzlib (1.0) require stdio.h */
+
+#include "gpg.h"
+#include "../common/util.h"
+#include <bzlib.h>
+
+#include "packet.h"
+#include "filter.h"
+#include "main.h"
+#include "options.h"
+
+/* Note that the code in compress.c is nearly identical to the code
+ here, so if you fix a bug here, look there to see if a matching bug
+ needs to be fixed. I tried to have one set of functions that could
+ do ZIP, ZLIB, and BZIP2, but it became dangerously unreadable with
+ #ifdefs and if(algo) -dshaw */
+
+static void
+init_compress( compress_filter_context_t *zfx, bz_stream *bzs )
+{
+ int rc;
+ int level;
+
+ if( opt.bz2_compress_level >= 1 && opt.bz2_compress_level <= 9 )
+ level = opt.bz2_compress_level;
+ else if( opt.bz2_compress_level == -1 )
+ level = 6; /* no particular reason, but it seems reasonable */
+ else
+ {
+ log_error("invalid compression level; using default level\n");
+ level = 6;
+ }
+
+ if((rc=BZ2_bzCompressInit(bzs,level,0,0))!=BZ_OK)
+ log_fatal("bz2lib problem: %d\n",rc);
+
+ zfx->outbufsize = 8192;
+ zfx->outbuf = xmalloc( zfx->outbufsize );
+}
+
+static int
+do_compress(compress_filter_context_t *zfx, bz_stream *bzs, int flush, IOBUF a)
+{
+ int rc;
+ int zrc;
+ unsigned n;
+
+ do
+ {
+ bzs->next_out = zfx->outbuf;
+ bzs->avail_out = zfx->outbufsize;
+ if( DBG_FILTER )
+ log_debug("enter bzCompress: avail_in=%u, avail_out=%u, flush=%d\n",
+ (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, flush );
+ zrc = BZ2_bzCompress( bzs, flush );
+ if( zrc == BZ_STREAM_END && flush == BZ_FINISH )
+ ;
+ else if( zrc != BZ_RUN_OK && zrc != BZ_FINISH_OK )
+ log_fatal("bz2lib deflate problem: rc=%d\n", zrc );
+
+ n = zfx->outbufsize - bzs->avail_out;
+ if( DBG_FILTER )
+ log_debug("leave bzCompress:"
+ " avail_in=%u, avail_out=%u, n=%u, zrc=%d\n",
+ (unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
+ (unsigned)n, zrc );
+
+ if( (rc=iobuf_write( a, zfx->outbuf, n )) )
+ {
+ log_debug("bzCompress: iobuf_write failed\n");
+ return rc;
+ }
+ }
+ while( bzs->avail_in || (flush == BZ_FINISH && zrc != BZ_STREAM_END) );
+
+ return 0;
+}
+
+static void
+init_uncompress( compress_filter_context_t *zfx, bz_stream *bzs )
+{
+ int rc;
+
+ if((rc=BZ2_bzDecompressInit(bzs,0,opt.bz2_decompress_lowmem))!=BZ_OK)
+ log_fatal("bz2lib problem: %d\n",rc);
+
+ zfx->inbufsize = 2048;
+ zfx->inbuf = xmalloc( zfx->inbufsize );
+ bzs->avail_in = 0;
+}
+
+static int
+do_uncompress( compress_filter_context_t *zfx, bz_stream *bzs,
+ IOBUF a, size_t *ret_len )
+{
+ int zrc;
+ int rc=0;
+ size_t n;
+ int nread, count;
+ int refill = !bzs->avail_in;
+ int eofseen = 0;
+
+ if( DBG_FILTER )
+ log_debug("begin bzDecompress: avail_in=%u, avail_out=%u, inbuf=%u\n",
+ (unsigned)bzs->avail_in, (unsigned)bzs->avail_out,
+ (unsigned)zfx->inbufsize );
+ do
+ {
+ if( bzs->avail_in < zfx->inbufsize && refill )
+ {
+ n = bzs->avail_in;
+ if( !n )
+ bzs->next_in = zfx->inbuf;
+ count = zfx->inbufsize - n;
+ nread = iobuf_read( a, zfx->inbuf + n, count );
+ if( nread == -1 )
+ {
+ eofseen = 1;
+ nread = 0;
+ }
+ n += nread;
+ bzs->avail_in = n;
+ }
+ if (!eofseen)
+ refill = 1;
+
+ if( DBG_FILTER )
+ log_debug("enter bzDecompress: avail_in=%u, avail_out=%u\n",
+ (unsigned)bzs->avail_in, (unsigned)bzs->avail_out);
+
+ zrc=BZ2_bzDecompress(bzs);
+ if( DBG_FILTER )
+ log_debug("leave bzDecompress: avail_in=%u, avail_out=%u, zrc=%d\n",
+ (unsigned)bzs->avail_in, (unsigned)bzs->avail_out, zrc);
+ if( zrc == BZ_STREAM_END )
+ rc = -1; /* eof */
+ else if( zrc != BZ_OK && zrc != BZ_PARAM_ERROR )
+ log_fatal("bz2lib inflate problem: rc=%d\n", zrc );
+ else if (zrc == BZ_OK && eofseen
+ && !bzs->avail_in && bzs->avail_out > 0)
+ {
+ log_error ("unexpected EOF in bz2lib\n");
+ rc = GPG_ERR_BAD_DATA;
+ break;
+ }
+ }
+ while( bzs->avail_out && zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR );
+
+ /* I'm not completely happy with the two uses of BZ_PARAM_ERROR
+ here. The corresponding zlib function is Z_BUF_ERROR, which
+ covers a narrower scope than BZ_PARAM_ERROR. -dshaw */
+
+ *ret_len = zfx->outbufsize - bzs->avail_out;
+ if( DBG_FILTER )
+ log_debug("do_uncompress: returning %u bytes\n", (unsigned)*ret_len );
+ return rc;
+}
+
+int
+compress_filter_bz2( void *opaque, int control,
+ IOBUF a, byte *buf, size_t *ret_len)
+{
+ size_t size = *ret_len;
+ compress_filter_context_t *zfx = opaque;
+ bz_stream *bzs = zfx->opaque;
+ int rc=0;
+
+ if( control == IOBUFCTRL_UNDERFLOW )
+ {
+ if( !zfx->status )
+ {
+ bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
+ init_uncompress( zfx, bzs );
+ zfx->status = 1;
+ }
+
+ bzs->next_out = buf;
+ bzs->avail_out = size;
+ zfx->outbufsize = size; /* needed only for calculation */
+ rc = do_uncompress( zfx, bzs, a, ret_len );
+ }
+ else if( control == IOBUFCTRL_FLUSH )
+ {
+ if( !zfx->status )
+ {
+ PACKET pkt;
+ PKT_compressed cd;
+
+ if( zfx->algo != COMPRESS_ALGO_BZIP2 )
+ 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");
+ bzs = zfx->opaque = xmalloc_clear( sizeof *bzs );
+ init_compress( zfx, bzs );
+ zfx->status = 2;
+ }
+
+ bzs->next_in = buf;
+ bzs->avail_in = size;
+ rc = do_compress( zfx, bzs, BZ_RUN, a );
+ }
+ else if( control == IOBUFCTRL_FREE )
+ {
+ if( zfx->status == 1 )
+ {
+ BZ2_bzDecompressEnd(bzs);
+ xfree(bzs);
+ zfx->opaque = NULL;
+ xfree(zfx->outbuf); zfx->outbuf = NULL;
+ }
+ else if( zfx->status == 2 )
+ {
+ bzs->next_in = buf;
+ bzs->avail_in = 0;
+ do_compress( zfx, bzs, BZ_FINISH, a );
+ BZ2_bzCompressEnd(bzs);
+ xfree(bzs);
+ zfx->opaque = NULL;
+ xfree(zfx->outbuf); zfx->outbuf = NULL;
+ }
+ if (zfx->release)
+ zfx->release (zfx);
+ }
+ else if( control == IOBUFCTRL_DESC )
+ mem2str (buf, "compress_filter", *ret_len);
+ return rc;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-17 01:23:55 +0000