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/* tvbuff_snappy.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#ifdef HAVE_SNAPPY
#include <snappy-c.h>
#endif
#include "tvbuff.h"
#ifdef HAVE_SNAPPY
/*
* Uncompresses a snappy compressed packet inside a message of tvb at offset with
* length comprlen. Returns an uncompressed tvbuffer if uncompression
* succeeded or NULL if uncompression failed.
*/
tvbuff_t *
tvb_uncompress_snappy(tvbuff_t *tvb, const int offset, int comprlen)
{
tvbuff_t *uncompr_tvb = NULL;
unsigned char *decompressed_buffer = NULL;
size_t orig_size = 0;
snappy_status ret;
const void *compr_ptr;
if (tvb == NULL || comprlen <= 0 || comprlen > tvb_captured_length_remaining(tvb, offset)) {
return NULL;
}
compr_ptr = tvb_get_ptr(tvb, offset, comprlen);
ret = snappy_uncompressed_length(compr_ptr, comprlen, &orig_size);
if (ret == SNAPPY_OK) {
decompressed_buffer = (unsigned char *)g_malloc(orig_size);
ret = snappy_uncompress(compr_ptr, comprlen, decompressed_buffer, &orig_size);
if (ret == SNAPPY_OK) {
uncompr_tvb = tvb_new_real_data(decompressed_buffer, (uint32_t)orig_size, (uint32_t)orig_size);
tvb_set_free_cb(uncompr_tvb, g_free);
} else {
g_free(decompressed_buffer);
}
}
return uncompr_tvb;
}
#else
tvbuff_t *
tvb_uncompress_snappy(tvbuff_t *tvb _U_, const int offset _U_, int comprlen _U_)
{
return NULL;
}
#endif
tvbuff_t *
tvb_child_uncompress_snappy(tvbuff_t *parent, tvbuff_t *tvb, const int offset, int comprlen)
{
tvbuff_t *new_tvb = tvb_uncompress_snappy(tvb, offset, comprlen);
if (new_tvb)
tvb_set_child_real_data_tvbuff(parent, new_tvb);
return new_tvb;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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