Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 377 insertions, 0 deletions

diff --git a/g10/compress.c b/g10/compress.c
new file mode 100644
index 0000000..e7a6f2b
--- /dev/null
+++ b/g10/compress.c
@@ -0,0 +1,377 @@
+/* compress.c - compress filter
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002,
+ *               2003, 2006, 2010 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/>.
+ */
+
+/* Note that the code in compress-bz2.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 */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#ifdef HAVE_ZIP
+# include <zlib.h>
+# if defined(__riscos__) && defined(USE_ZLIBRISCOS)
+#  include "zlib-riscos.h"
+# endif
+#endif
+
+#include "gpg.h"
+#include "../common/util.h"
+#include "packet.h"
+#include "filter.h"
+#include "main.h"
+#include "options.h"
+
+
+#ifdef __riscos__
+#define BYTEF_CAST(a) ((Bytef *)(a))
+#else
+#define BYTEF_CAST(a) (a)
+#endif
+
+
+
+int compress_filter_bz2( void *opaque, int control,
+			 IOBUF a, byte *buf, size_t *ret_len);
+
+#ifdef HAVE_ZIP
+static void
+init_compress( compress_filter_context_t *zfx, z_stream *zs )
+{
+    int rc;
+    int level;
+
+#if defined(__riscos__) && defined(USE_ZLIBRISCOS)
+    static int zlib_initialized = 0;
+
+    if (!zlib_initialized)
+        zlib_initialized = riscos_load_module("ZLib", zlib_path, 1);
+#endif
+
+    if( opt.compress_level >= 1 && opt.compress_level <= 9 )
+	level = opt.compress_level;
+    else if( opt.compress_level == -1 )
+	level = Z_DEFAULT_COMPRESSION;
+    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 a )
+{
+    int rc;
+    int zrc;
+    unsigned n;
+
+    do {
+	zs->next_out = BYTEF_CAST (zfx->outbuf);
+	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 );
+
+	if( (rc=iobuf_write( a, zfx->outbuf, n )) ) {
+	    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 a, size_t *ret_len )
+{
+    int zrc;
+    int rc = 0;
+    int leave = 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 )
+            zs->next_in = BYTEF_CAST (zfx->inbuf);
+	    count = zfx->inbufsize - n;
+	    nread = iobuf_read( a, zfx->inbuf + n, count );
+	    if( nread == -1 ) nread = 0;
+	    n += nread;
+	    /* Algo 1 has no zlib header which requires us to give
+	     * inflate an extra dummy byte to read. To be on the safe
+	     * side we allow for up to 4 ff bytes.  */
+	    if( nread < count && zfx->algo == 1 && zfx->algo1hack < 4) {
+		*(zfx->inbuf + n) = 0xFF;
+		zfx->algo1hack++;
+		n++;
+                leave = 1;
+	    }
+	    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);
+	zrc = inflate ( zs, Z_SYNC_FLUSH );
+	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
+             && !leave);
+
+    *ret_len = zfx->outbufsize - zs->avail_out;
+    if( DBG_FILTER )
+	log_debug("do_uncompress: returning %u bytes (%u ignored)\n",
+                  (unsigned int)*ret_len, (unsigned int)zs->avail_in );
+    return rc;
+}
+
+static 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 rc=0;
+
+    if( control == IOBUFCTRL_UNDERFLOW ) {
+	if( !zfx->status ) {
+	    zs = zfx->opaque = xmalloc_clear( sizeof *zs );
+	    init_uncompress( zfx, zs );
+	    zfx->status = 1;
+	}
+
+	zs->next_out = BYTEF_CAST (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;
+	    if(zfx->algo != COMPRESS_ALGO_ZIP
+	       && zfx->algo != COMPRESS_ALGO_ZLIB)
+	      BUG();
+	    memset( &cd, 0, sizeof cd );
+	    cd.len = 0;
+	    cd.algorithm = zfx->algo;
+            /* Fixme: We should force a new CTB here:
+               cd.new_ctb = zfx->new_ctb;
+            */
+	    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 = xmalloc_clear( sizeof *zs );
+	    init_compress( zfx, zs );
+	    zfx->status = 2;
+	}
+
+	zs->next_in = BYTEF_CAST (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);
+	    xfree(zs);
+	    zfx->opaque = NULL;
+	    xfree(zfx->outbuf); zfx->outbuf = NULL;
+	}
+	else if( zfx->status == 2 ) {
+	    zs->next_in = BYTEF_CAST (buf);
+	    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 )
+        mem2str (buf, "compress_filter", *ret_len);
+    return rc;
+}
+#endif /*HAVE_ZIP*/
+
+static void
+release_context (compress_filter_context_t *ctx)
+{
+  xfree(ctx->inbuf);
+  ctx->inbuf = NULL;
+  xfree(ctx->outbuf);
+  ctx->outbuf = NULL;
+  xfree (ctx);
+}
+
+/****************
+ * Handle a compressed packet
+ */
+int
+handle_compressed (ctrl_t ctrl, void *procctx, PKT_compressed *cd,
+		   int (*callback)(IOBUF, void *), void *passthru )
+{
+    int rc;
+
+    if(check_compress_algo(cd->algorithm))
+      return GPG_ERR_COMPR_ALGO;
+    if(cd->algorithm) {
+        compress_filter_context_t *cfx;
+
+        cfx = xmalloc_clear (sizeof *cfx);
+        cfx->release = release_context;
+        cfx->algo = cd->algorithm;
+        if (push_compress_filter(cd->buf, cfx, cd->algorithm))
+          xfree (cfx);
+    }
+    if( callback )
+	rc = callback(cd->buf, passthru );
+    else
+      rc = proc_packets (ctrl,procctx, cd->buf);
+    cd->buf = NULL;
+    return rc;
+}
+
+gpg_error_t
+push_compress_filter(IOBUF out,compress_filter_context_t *zfx,int algo)
+{
+  return push_compress_filter2(out,zfx,algo,0);
+}
+
+
+/* Push a compress filter and return 0 if that succeeded.  */
+gpg_error_t
+push_compress_filter2(IOBUF out,compress_filter_context_t *zfx,
+		      int algo,int rel)
+{
+  gpg_error_t err = gpg_error (GPG_ERR_FALSE);
+
+  if(algo>=0)
+    zfx->algo=algo;
+  else
+    zfx->algo=DEFAULT_COMPRESS_ALGO;
+
+  switch(zfx->algo)
+    {
+    case COMPRESS_ALGO_NONE:
+      break;
+
+#ifdef HAVE_ZIP
+    case COMPRESS_ALGO_ZIP:
+    case COMPRESS_ALGO_ZLIB:
+      iobuf_push_filter2(out,compress_filter,zfx,rel);
+      err = 0;
+      break;
+#endif
+
+#ifdef HAVE_BZIP2
+    case COMPRESS_ALGO_BZIP2:
+      iobuf_push_filter2(out,compress_filter_bz2,zfx,rel);
+      err = 0;
+      break;
+#endif
+
+    default:
+      BUG();
+    }
+
+  return err;
+}