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/*****************************************************************************
* dynamicoverlay_buffer.c : dynamic overlay buffer
*****************************************************************************
* Copyright (C) 2008-2009 VLC authors and VideoLAN
* $Id$
*
* Author: Søren Bøg <avacore@videolan.org>
* Jean-Paul Saman <jpsaman@videolan.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_filter.h>
#include <ctype.h>
#include "dynamicoverlay.h"
/*****************************************************************************
* buffer_t: Command and response buffer
*****************************************************************************/
int BufferInit( buffer_t *p_buffer )
{
memset( p_buffer, 0, sizeof( buffer_t ) );
p_buffer->p_memory = NULL;
p_buffer->p_begin = NULL;
return VLC_SUCCESS;
}
int BufferDestroy( buffer_t *p_buffer )
{
free( p_buffer->p_memory );
p_buffer->p_memory = NULL;
p_buffer->p_begin = NULL;
return VLC_SUCCESS;
}
char *BufferGetToken( buffer_t *p_buffer )
{
char *p_char = p_buffer->p_begin;
while( isspace( (unsigned char)p_char[0] ) || p_char[0] == '\0' )
{
if( p_char <= (p_buffer->p_begin + p_buffer->i_length) )
p_char++;
else
return NULL;
}
return p_char;
}
int BufferAdd( buffer_t *p_buffer, const char *p_data, size_t i_len )
{
if( ( p_buffer->i_size - p_buffer->i_length -
( p_buffer->p_begin - p_buffer->p_memory ) ) < i_len )
{
/* We'll have to do some rearranging to fit the new data. */
if( ( p_buffer->i_size - p_buffer->i_length ) >= i_len )
{
/* We have room in the current buffer, just need to move it */
memmove( p_buffer->p_memory, p_buffer->p_begin,
p_buffer->i_length );
p_buffer->p_begin = p_buffer->p_memory;
}
else
{
// We need a bigger buffer
size_t i_newsize = 1024;
while( i_newsize < p_buffer->i_length + i_len )
i_newsize *= 2;
/* TODO: Should I handle wrapping here? */
/* I'm not using realloc here, as I can avoid a memcpy/memmove in
some (most?) cases, and reset the start of the buffer. */
char *p_newdata = malloc( i_newsize );
if( p_newdata == NULL )
return VLC_ENOMEM;
if( p_buffer->p_begin != NULL )
{
memcpy( p_newdata, p_buffer->p_begin, p_buffer->i_length );
free( p_buffer->p_memory );
}
p_buffer->p_memory = p_buffer->p_begin = p_newdata;
p_buffer->i_size = i_newsize;
}
}
/* Add the new data to the end of the current */
memcpy( p_buffer->p_begin + p_buffer->i_length, p_data, i_len );
p_buffer->i_length += i_len;
return VLC_SUCCESS;
}
int BufferPrintf( buffer_t *p_buffer, const char *p_fmt, ... )
{
int i_len;
int status;
char *psz_data;
va_list va;
va_start( va, p_fmt );
i_len = vasprintf( &psz_data, p_fmt, va );
va_end( va );
if( i_len == -1 )
return VLC_ENOMEM;
status = BufferAdd( p_buffer, psz_data, i_len );
free( psz_data );
return status;
}
int BufferDel( buffer_t *p_buffer, int i_len )
{
p_buffer->i_length -= i_len;
if( p_buffer->i_length == 0 )
{
/* No data, we can reset the buffer now. */
p_buffer->p_begin = p_buffer->p_memory;
}
else
{
p_buffer->p_begin += i_len;
}
return VLC_SUCCESS;
}
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