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96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
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/*****************************************************************************
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* bits.h
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*****************************************************************************
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* Copyright (C) 2001, 2002 the VideoLAN team
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* $Id$
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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* Eric Petit <titer@videolan.org>
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*
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* Copyright (C) 2008 Lin YANG <oxcsnicho@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef __BITS_H__
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#define __BITS_H__
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#include <glib.h>
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G_BEGIN_DECLS
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typedef struct bits_buffer_s
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{
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gint i_size;
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gint i_data;
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guint8 i_mask;
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guint8* p_data;
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} bits_buffer_t;
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static inline gint bits_initwrite( bits_buffer_t *p_buffer,
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gint i_size, void *p_data )
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{
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p_buffer->i_size = i_size;
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p_buffer->i_data = 0;
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p_buffer->i_mask = 0x80;
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p_buffer->p_data = p_data;
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if( !p_buffer->p_data )
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{
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if( !( p_buffer->p_data = g_slice_alloc0( i_size ) ) )
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return -1;
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}
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p_buffer->p_data[0] = 0;
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return 0;
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}
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static inline void bits_align( bits_buffer_t *p_buffer )
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{
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if( p_buffer->i_mask != 0x80 && p_buffer->i_data < p_buffer->i_size )
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{
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p_buffer->i_mask = 0x80;
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p_buffer->i_data++;
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p_buffer->p_data[p_buffer->i_data] = 0x00;
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}
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}
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static inline void bits_write( bits_buffer_t *p_buffer,
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gint i_count, guint64 i_bits )
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{
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while( i_count > 0 )
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{
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i_count--;
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if( ( i_bits >> i_count )&0x01 )
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{
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p_buffer->p_data[p_buffer->i_data] |= p_buffer->i_mask;
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}
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else
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{
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p_buffer->p_data[p_buffer->i_data] &= ~p_buffer->i_mask;
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}
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p_buffer->i_mask >>= 1;
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if( p_buffer->i_mask == 0 )
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{
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p_buffer->i_data++;
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p_buffer->i_mask = 0x80;
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}
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}
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}
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G_END_DECLS
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#endif
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