/*****************************************************************************
* vlc_block_helper.h: Helper functions for data blocks management.
*****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: vlc_block_helper.h,v 1.5 2003/11/16 21:07:30 gbazin Exp $
+ * Copyright (C) 2003 the VideoLAN team
+ * $Id$
*
* Authors: Gildas Bazin <gbazin@netcourrier.com>
*
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifndef _VLC_BLOCK_HELPER_H
#define _VLC_BLOCK_HELPER_H 1
+#include <vlc_block.h>
+
typedef struct block_bytestream_t
{
block_t *p_chain;
block_t *p_block;
- int i_offset;
+ size_t i_offset;
} block_bytestream_t;
-#define block_BytestreamInit( a ) __block_BytestreamInit( VLC_OBJECT(a) )
-
/*****************************************************************************
* block_bytestream_t management
*****************************************************************************/
-static inline block_bytestream_t __block_BytestreamInit( vlc_object_t *p_obj )
+static inline block_bytestream_t block_BytestreamInit( void )
{
block_bytestream_t bytestream;
}
static inline int block_WaitBytes( block_bytestream_t *p_bytestream,
- int i_data )
+ size_t i_data )
{
block_t *p_block;
- int i_offset, i_copy, i_size;
+ size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
}
static inline int block_SkipBytes( block_bytestream_t *p_bytestream,
- int i_data )
+ size_t i_data )
{
block_t *p_block;
- int i_offset, i_copy;
+ size_t i_offset, i_copy;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
}
static inline int block_PeekBytes( block_bytestream_t *p_bytestream,
- uint8_t *p_data, int i_data )
+ uint8_t *p_data, size_t i_data )
{
block_t *p_block;
- int i_offset, i_copy, i_size;
+ size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
}
static inline int block_GetBytes( block_bytestream_t *p_bytestream,
- uint8_t *p_data, int i_data )
+ uint8_t *p_data, size_t i_data )
{
block_t *p_block;
- int i_offset, i_copy, i_size;
+ size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
}
static inline int block_PeekOffsetBytes( block_bytestream_t *p_bytestream,
- int i_peek_offset, uint8_t *p_data, int i_data )
+ size_t i_peek_offset, uint8_t *p_data, size_t i_data )
{
block_t *p_block;
- int i_offset, i_copy, i_size;
+ size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
return VLC_SUCCESS;
}
+static inline int block_FindStartcodeFromOffset(
+ block_bytestream_t *p_bytestream, size_t *pi_offset,
+ uint8_t *p_startcode, int i_startcode_length )
+{
+ block_t *p_block, *p_block_backup = 0;
+ int i_size = 0;
+ size_t i_offset, i_offset_backup = 0;
+ int i_caller_offset_backup = 0, i_match;
+
+ /* Find the right place */
+ i_size = *pi_offset + p_bytestream->i_offset;
+ for( p_block = p_bytestream->p_block;
+ p_block != NULL; p_block = p_block->p_next )
+ {
+ i_size -= p_block->i_buffer;
+ if( i_size < 0 ) break;
+ }
+
+ if( i_size >= 0 )
+ {
+ /* Not enough data, bail out */
+ return VLC_EGENERIC;
+ }
+
+ /* Begin the search.
+ * We first look for an occurrence of the 1st startcode byte and
+ * if found, we do a more thorough check. */
+ i_size += p_block->i_buffer;
+ *pi_offset -= i_size;
+ i_match = 0;
+ for( ; p_block != NULL; p_block = p_block->p_next )
+ {
+ for( i_offset = i_size; i_offset < p_block->i_buffer; i_offset++ )
+ {
+ if( p_block->p_buffer[i_offset] == p_startcode[i_match] )
+ {
+ if( !i_match )
+ {
+ p_block_backup = p_block;
+ i_offset_backup = i_offset;
+ i_caller_offset_backup = *pi_offset;
+ }
+
+ if( i_match + 1 == i_startcode_length )
+ {
+ /* We have it */
+ *pi_offset += i_offset - i_match;
+ return VLC_SUCCESS;
+ }
+
+ i_match++;
+ }
+ else if ( i_match )
+ {
+ /* False positive */
+ p_block = p_block_backup;
+ i_offset = i_offset_backup;
+ *pi_offset = i_caller_offset_backup;
+ i_match = 0;
+ }
+
+ }
+ i_size = 0;
+ *pi_offset += i_offset;
+ }
+
+ *pi_offset -= i_match;
+ return VLC_EGENERIC;
+}
+
#endif /* VLC_BLOCK_HELPER_H */