buffer.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:6k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * buffer.c: MMS access plug-in
- *****************************************************************************
- * Copyright (C) 2001-2004 the VideoLAN team
- * $Id: 06115d35f1e1e259593fecc6ab1332ffc4b7dfac $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include "asf.h"
- #include "buffer.h"
- /*****************************************************************************
- * Buffer management functions
- *****************************************************************************/
- int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
- {
- p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
- p_buf->i_data = 0;
- if( !( p_buf->p_data = malloc( p_buf->i_size ) ) )
- {
- return( -1 );
- }
- return( 0 );
- }
- int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
- {
- p_buf->i_data = 0;
- if( p_buf->i_size < i_default_size )
- {
- p_buf->i_size = i_default_size;
- free( p_buf->p_data );
- p_buf->p_data = malloc( p_buf->i_size );
- }
- if( !p_buf->p_data )
- {
- p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
- p_buf->p_data = malloc( p_buf->i_size );
- }
- if( !p_buf->p_data )
- {
- return( -1 );
- }
- return( 0 );
- }
- void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
- {
- /* check if there is enough data */
- if( p_buf->i_data >= p_buf->i_size )
- {
- p_buf->i_size += 1024;
- p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
- }
- p_buf->p_data[p_buf->i_data] = i_byte&0xff;
- p_buf->i_data++;
- }
- void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
- {
- var_buffer_add8( p_buf, i_word&0xff );
- var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
- }
- void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
- {
- var_buffer_add16( p_buf, i_dword&0xffff );
- var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
- }
- void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
- {
- var_buffer_add32( p_buf, i_long&0xffffffff );
- var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
- }
- void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
- {
- /* check if there is enough data */
- if( p_buf->i_data + i_mem >= p_buf->i_size )
- {
- p_buf->i_size += i_mem + 1024;
- p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
- }
- memcpy( p_buf->p_data + p_buf->i_data,
- p_mem,
- i_mem );
- p_buf->i_data += i_mem;
- }
- void var_buffer_addUTF16( var_buffer_t *p_buf, const char *p_str )
- {
- unsigned int i;
- if( !p_str )
- {
- var_buffer_add16( p_buf, 0 );
- }
- else
- {
- vlc_iconv_t iconv_handle;
- size_t i_in = strlen( p_str );
- size_t i_out = i_in * 4;
- char *psz_out, *psz_tmp;
- psz_out = psz_tmp = malloc( i_out + 1 );
- iconv_handle = vlc_iconv_open( "UTF-16LE", "UTF-8" );
- vlc_iconv( iconv_handle, &p_str, &i_in, &psz_tmp, &i_out );
- vlc_iconv_close( iconv_handle );
- psz_tmp[0] = ' ';
- psz_tmp[1] = ' ';
- for( i = 0; ; i += 2 )
- {
- uint16_t v = GetWLE( &psz_out[i] );
- var_buffer_add16( p_buf, v );
- if( !v )
- break;
- }
- free( psz_out );
- }
- }
- void var_buffer_free( var_buffer_t *p_buf )
- {
- free( p_buf->p_data );
- p_buf->i_data = 0;
- p_buf->i_size = 0;
- }
- void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
- {
- p_buf->i_size = i_data;
- p_buf->i_data = 0;
- p_buf->p_data = p_data;
- }
- uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
- {
- uint8_t i_byte;
- if( p_buf->i_data >= p_buf->i_size )
- {
- return( 0 );
- }
- i_byte = p_buf->p_data[p_buf->i_data];
- p_buf->i_data++;
- return( i_byte );
- }
- uint16_t var_buffer_get16( var_buffer_t *p_buf )
- {
- uint16_t i_b1, i_b2;
- i_b1 = var_buffer_get8( p_buf );
- i_b2 = var_buffer_get8( p_buf );
- return( i_b1 + ( i_b2 << 8 ) );
- }
- uint32_t var_buffer_get32( var_buffer_t *p_buf )
- {
- uint32_t i_w1, i_w2;
- i_w1 = var_buffer_get16( p_buf );
- i_w2 = var_buffer_get16( p_buf );
- return( i_w1 + ( i_w2 << 16 ) );
- }
- uint64_t var_buffer_get64( var_buffer_t *p_buf )
- {
- uint64_t i_dw1, i_dw2;
- i_dw1 = var_buffer_get32( p_buf );
- i_dw2 = var_buffer_get32( p_buf );
- return( i_dw1 + ( i_dw2 << 32 ) );
- }
- int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
- {
- int i_copy;
- i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
- if( i_copy > 0 && p_mem != NULL)
- {
- memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
- }
- if( i_copy < 0 )
- {
- i_copy = 0;
- }
- p_buf->i_data += i_copy;
- return( i_copy );
- }
- int var_buffer_readempty( var_buffer_t *p_buf )
- {
- return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
- }
- void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
- {
- int i;
- p_guid->v1 = var_buffer_get32( p_buf );
- p_guid->v2 = var_buffer_get16( p_buf );
- p_guid->v3 = var_buffer_get16( p_buf );
- for( i = 0; i < 8; i++ )
- {
- p_guid->v4[i] = var_buffer_get8( p_buf );
- }
- }