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/* Copyright (C) 2007-2010 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Pablo Rincon Crespo <pablo.rincon.crespo@gmail.com>
* Based on FMem.c of Alexandre Flori (2008/10/17 AF)
*/
#include "suricata-common.h"
#include "util-fmemopen.h"
#ifdef OS_DARWIN
#define USE_FMEM_WRAPPER 1
#endif
#ifdef OS_FREEBSD
#define USE_FMEM_WRAPPER 1
#endif
#ifdef __OpenBSD__
#define USE_FMEM_WRAPPER 1
#endif
#ifdef USE_FMEM_WRAPPER
#ifdef OS_WIN32
/**
* \brief portable version of SCFmemopen for Windows works on top of real temp files
* \param buffer that holds the file content
* \param size of the file buffer
* \param mode mode of the file to open
* \retval pointer to the file; NULL if something is wrong
*/
FILE *SCFmemopen(void *buf, size_t size, const char *mode)
{
char temppath[MAX_PATH - 13];
if (0 == GetTempPath(sizeof(temppath), temppath))
return NULL;
char filename[MAX_PATH + 1];
if (0 == GetTempFileName(temppath, "SC", 0, filename))
return NULL;
FILE *f = fopen(filename, "wb");
if (NULL == f)
return NULL;
fwrite(buf, size, 1, f);
fclose(f);
return fopen(filename, mode);
}
#else
typedef struct SCFmem_ {
size_t pos;
size_t size;
char *buffer;
} SCFmem;
/**
* \brief Seek the mem file from offset and whence
* \param handler pointer to the memfile
* \param offset number of bytes to move from whence
* \param whence SEEK_SET, SEEK_CUR, SEEK_END
* \retval pos the position by the last operation, -1 if sizes are out of bounds
*/
static fpos_t SeekFn(void *handler, fpos_t offset, int whence)
{
size_t pos = 0;
SCFmem *mem = handler;
switch (whence) {
case SEEK_SET:
if (offset >= 0 && (size_t)offset <= mem->size) {
return mem->pos = offset;
}
break;
case SEEK_CUR:
if (mem->pos + offset <= mem->size)
return mem->pos += offset;
break;
case SEEK_END:
/* must be negative */
if (mem->size + offset <= mem->size)
return pos = mem->size + offset;
break;
}
return -1;
}
/**
* \brief Read from the buffer looking for the available memory limits
* \param handler pointer to the memfile
* \param buf buffer to read from the handler
* \param number of bytes to read
* \retval count , the number of bytes read
*/
static int ReadFn(void *handler, char *buf, int size)
{
size_t count = 0;
SCFmem *mem = handler;
size_t available = mem->size - mem->pos;
int is_eof = 0;
if (size < 0) return - 1;
if ((size_t)size > available) {
size = available;
} else {
is_eof = 1;
}
while (count < (size_t)size)
buf[count++] = mem->buffer[mem->pos++];
if (is_eof == 1)
return 0;
return count;
}
/**
* \brief Write into the buffer looking for the available memory limits
* \param handler pointer to the memfile
* \param buf buffer to write in the handler
* \param number of bytes to write
* \retval count , the number of bytes written
*/
static int WriteFn(void *handler, const char *buf, int size)
{
size_t count = 0;
SCFmem *mem = handler;
size_t available = mem->size - mem->pos;
if (size < 0) return - 1;
if ((size_t)size > available)
size = available;
while (count < (size_t)size)
mem->buffer[mem->pos++] = buf[count++];
return count;
}
/**
* \brief close the mem file handler
* \param handler pointer to the memfile
* \retval 0 on succesful
*/
static int CloseFn(void *handler)
{
SCFree(handler);
return 0;
}
/**
* \brief portable version of SCFmemopen for OS X / BSD built on top of funopen()
* \param buffer that holds the file content
* \param size of the file buffer
* \param mode mode of the file to open
* \retval pointer to the file; NULL if something is wrong
*/
FILE *SCFmemopen(void *buf, size_t size, const char *mode)
{
SCFmem *mem = (SCFmem *) SCMalloc(sizeof(SCFmem));
if (mem == NULL)
return NULL;
memset(mem, 0, sizeof(SCFmem));
mem->size = size, mem->buffer = buf;
return funopen(mem, ReadFn, WriteFn, SeekFn, CloseFn);
}
#endif /* OS_WIN32 */
#endif /* USE_FMEM_WRAPPER */
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