bits.h
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:2k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * bits.h
- *****************************************************************************
- * Copyright (C) 2001, 2002 the VideoLAN team
- * $Id: 0a14e904ca20fbd37ed0de088549ee3f914b4dac $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- * Eric Petit <titer@videolan.org>
- *
- * 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.
- *****************************************************************************/
- typedef struct bits_buffer_s
- {
- int i_size;
- int i_data;
- uint8_t i_mask;
- uint8_t *p_data;
- } bits_buffer_t;
- static inline int bits_initwrite( bits_buffer_t *p_buffer,
- int i_size, void *p_data )
- {
- p_buffer->i_size = i_size;
- p_buffer->i_data = 0;
- p_buffer->i_mask = 0x80;
- p_buffer->p_data = p_data;
- if( !p_buffer->p_data )
- {
- if( !( p_buffer->p_data = malloc( i_size ) ) )
- return -1;
- }
- p_buffer->p_data[0] = 0;
- return 0;
- }
- static inline void bits_align( bits_buffer_t *p_buffer )
- {
- if( p_buffer->i_mask != 0x80 && p_buffer->i_data < p_buffer->i_size )
- {
- p_buffer->i_mask = 0x80;
- p_buffer->i_data++;
- p_buffer->p_data[p_buffer->i_data] = 0x00;
- }
- }
- static inline void bits_write( bits_buffer_t *p_buffer,
- int i_count, uint64_t i_bits )
- {
- while( i_count > 0 )
- {
- i_count--;
- if( ( i_bits >> i_count )&0x01 )
- {
- p_buffer->p_data[p_buffer->i_data] |= p_buffer->i_mask;
- }
- else
- {
- p_buffer->p_data[p_buffer->i_data] &= ~p_buffer->i_mask;
- }
- p_buffer->i_mask >>= 1;
- if( p_buffer->i_mask == 0 )
- {
- p_buffer->i_data++;
- p_buffer->i_mask = 0x80;
- }
- }
- }