/*
This file is part of GNUnet.
- (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
#include "platform.h"
#include "gnunet_util_lib.h"
+#if HAVE_EXTRACTOR_H
#include <extractor.h>
+#endif
#include <zlib.h>
#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+
+/**
+ * Try to compress the given block of data using libz. Only returns
+ * the compressed block if compression worked and the new block is
+ * actually smaller. Decompress using #GNUNET_decompress().
+ *
+ * @param data block to compress; if compression
+ * resulted in a smaller block, the first
+ * bytes of data are updated to the compressed
+ * data
+ * @param old_size number of bytes in data
+ * @param[out] result set to the compressed data, if compression worked
+ * @param[out] new_size set to size of result, if compression worked
+ * @return #GNUNET_YES if compression reduce the size,
+ * #GNUNET_NO if compression did not help
+ */
+int
+GNUNET_try_compression (const char *data,
+ size_t old_size,
+ char **result,
+ size_t *new_size)
+{
+ char *tmp;
+ uLongf dlen;
+
+ *result = NULL;
+ *new_size = 0;
+#ifdef compressBound
+ dlen = compressBound (old_size);
+#else
+ dlen = old_size + (old_size / 100) + 20;
+ /* documentation says 100.1% oldSize + 12 bytes, but we
+ * should be able to overshoot by more to be safe */
+#endif
+ tmp = GNUNET_malloc (dlen);
+ if (Z_OK ==
+ compress2 ((Bytef *) tmp,
+ &dlen,
+ (const Bytef *) data,
+ old_size, 9))
+ {
+ if (dlen < old_size)
+ {
+ *result = tmp;
+ *new_size = dlen;
+ return GNUNET_YES;
+ }
+ }
+ GNUNET_free (tmp);
+ return GNUNET_NO;
+}
+
+
+/**
+ * Decompress input, return the decompressed data as output. Dual to
+ * #GNUNET_try_compression(). Caller must set @a output_size to the
+ * number of bytes that were originally compressed.
+ *
+ * @param input compressed data
+ * @param input_size number of bytes in input
+ * @param output_size expected size of the output
+ * @return NULL on error, buffer of @a output_size decompressed bytes otherwise
+ */
+char *
+GNUNET_decompress (const char *input,
+ size_t input_size,
+ size_t output_size)
+{
+ char *output;
+ uLongf olen;
+
+ olen = output_size;
+ output = GNUNET_malloc (olen);
+ if (Z_OK ==
+ uncompress ((Bytef *) output,
+ &olen,
+ (const Bytef *) input,
+ input_size))
+ return output;
+ GNUNET_free (output);
+ return NULL;
+}
+
+
/**
* Meta data item.
*/
struct GNUNET_TIME_Absolute t;
t = GNUNET_TIME_absolute_get ();
- GNUNET_CONTAINER_meta_data_delete (md, EXTRACTOR_METATYPE_PUBLICATION_DATE,
+ GNUNET_CONTAINER_meta_data_delete (md,
+ EXTRACTOR_METATYPE_PUBLICATION_DATE,
NULL, 0);
dat = GNUNET_STRINGS_absolute_time_to_string (t);
GNUNET_CONTAINER_meta_data_insert (md, "<gnunet>",
* @return NULL if no entry was found
*/
char *
-GNUNET_CONTAINER_meta_data_get_by_type (const struct GNUNET_CONTAINER_MetaData
- *md, enum EXTRACTOR_MetaType type)
+GNUNET_CONTAINER_meta_data_get_by_type (const struct GNUNET_CONTAINER_MetaData *md,
+ enum EXTRACTOR_MetaType type)
{
struct MetaItem *pos;
}
-
-/**
- * Try to compress the given block of data.
- *
- * @param data block to compress; if compression
- * resulted in a smaller block, the first
- * bytes of data are updated to the compressed
- * data
- * @param oldSize number of bytes in data
- * @param result set to the compressed data
- * @param newSize set to size of result
- * @return #GNUNET_YES if compression reduce the size,
- * #GNUNET_NO if compression did not help
- */
-static int
-try_compression (const char *data, size_t oldSize, char **result,
- size_t * newSize)
-{
- char *tmp;
- uLongf dlen;
-
-#ifdef compressBound
- dlen = compressBound (oldSize);
-#else
- dlen = oldSize + (oldSize / 100) + 20;
- /* documentation says 100.1% oldSize + 12 bytes, but we
- * should be able to overshoot by more to be safe */
-#endif
- tmp = GNUNET_malloc (dlen);
- if (Z_OK ==
- compress2 ((Bytef *) tmp, &dlen, (const Bytef *) data, oldSize, 9))
- {
- if (dlen < oldSize)
- {
- *result = tmp;
- *newSize = dlen;
- return GNUNET_YES;
- }
- }
- GNUNET_free (tmp);
- return GNUNET_NO;
-}
-
-
/**
* Flag in 'version' that indicates compressed meta-data.
*/
{
comp = GNUNET_NO;
if (0 == (opt & GNUNET_CONTAINER_META_DATA_SERIALIZE_NO_COMPRESS))
- comp = try_compression ((const char *) &ent[i], left, &cdata, &clen);
+ comp = GNUNET_try_compression ((const char *) &ent[i],
+ left,
+ &cdata,
+ &clen);
if ((NULL == md->sbuf) && (0 == i))
{
}
-/**
- * Decompress input, return the decompressed data
- * as output, set outputSize to the number of bytes
- * that were found.
- *
- * @param input compressed data
- * @param inputSize number of bytes in input
- * @param outputSize expected size of the output
- * @return NULL on error
- */
-static char *
-decompress (const char *input, size_t inputSize, size_t outputSize)
-{
- char *output;
- uLongf olen;
-
- olen = outputSize;
- output = GNUNET_malloc (olen);
- if (Z_OK ==
- uncompress ((Bytef *) output, &olen, (const Bytef *) input, inputSize))
- return output;
- GNUNET_free (output);
- return NULL;
-}
-
-
/**
* Deserialize meta-data. Initializes md.
*
ic = ntohl (hdr.entries);
dataSize = ntohl (hdr.size);
if ( ((sizeof (struct MetaDataEntry) * ic) > dataSize) ||
- (0 == ic) ||
- (dataSize / ic < sizeof (struct MetaDataEntry)) )
+ ( (0 != ic) &&
+ (dataSize / ic < sizeof (struct MetaDataEntry)) ) )
{
GNUNET_break_op (0);
return NULL;
return NULL;
}
data =
- decompress ((const char *) &input[sizeof (struct MetaDataHeader)],
- size - sizeof (struct MetaDataHeader), dataSize);
+ GNUNET_decompress ((const char *) &input[sizeof (struct MetaDataHeader)],
+ size - sizeof (struct MetaDataHeader),
+ dataSize);
if (NULL == data)
{
GNUNET_break_op (0);
projects / oweals / gnunet.git / blobdiff