2009-01-22 03:00:49 +03:00
|
|
|
/********************************************************************
|
|
|
|
|
* *
|
|
|
|
|
* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
|
|
|
|
|
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
|
|
|
|
|
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
|
|
|
|
|
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
|
|
|
|
|
* *
|
2009-09-28 02:14:21 +04:00
|
|
|
* THE OggTheora SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
|
2009-01-22 03:00:49 +03:00
|
|
|
* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
|
|
|
|
|
* *
|
|
|
|
|
********************************************************************
|
|
|
|
|
|
|
|
|
|
function: packing variable sized words into an octet stream
|
|
|
|
|
last mod: $Id: bitwise.c 7675 2004-09-01 00:34:39Z xiphmont $
|
|
|
|
|
|
|
|
|
|
********************************************************************/
|
|
|
|
|
#if !defined(_bitpack_H)
|
|
|
|
|
# define _bitpack_H (1)
|
2010-11-08 10:47:34 +03:00
|
|
|
# include <stddef.h>
|
2009-09-28 02:14:21 +04:00
|
|
|
# include <limits.h>
|
2010-11-08 10:47:34 +03:00
|
|
|
# include "internal.h"
|
2009-01-22 03:00:49 +03:00
|
|
|
|
2009-09-28 02:14:21 +04:00
|
|
|
|
|
|
|
|
|
2010-11-08 10:47:34 +03:00
|
|
|
typedef size_t oc_pb_window;
|
2009-09-28 02:14:21 +04:00
|
|
|
typedef struct oc_pack_buf oc_pack_buf;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2010-11-08 10:47:34 +03:00
|
|
|
/*Custom bitpacker implementations.*/
|
|
|
|
|
# if defined(OC_ARM_ASM)
|
|
|
|
|
# include "arm/armbits.h"
|
|
|
|
|
# endif
|
|
|
|
|
|
|
|
|
|
# if !defined(oc_pack_read)
|
|
|
|
|
# define oc_pack_read oc_pack_read_c
|
|
|
|
|
# endif
|
|
|
|
|
# if !defined(oc_pack_read1)
|
|
|
|
|
# define oc_pack_read1 oc_pack_read1_c
|
|
|
|
|
# endif
|
|
|
|
|
# if !defined(oc_huff_token_decode)
|
|
|
|
|
# define oc_huff_token_decode oc_huff_token_decode_c
|
|
|
|
|
# endif
|
|
|
|
|
|
2009-09-28 02:14:21 +04:00
|
|
|
# define OC_PB_WINDOW_SIZE ((int)sizeof(oc_pb_window)*CHAR_BIT)
|
|
|
|
|
/*This is meant to be a large, positive constant that can still be efficiently
|
|
|
|
|
loaded as an immediate (on platforms like ARM, for example).
|
|
|
|
|
Even relatively modest values like 100 would work fine.*/
|
|
|
|
|
# define OC_LOTS_OF_BITS (0x40000000)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
struct oc_pack_buf{
|
|
|
|
|
const unsigned char *stop;
|
2010-11-08 10:47:34 +03:00
|
|
|
const unsigned char *ptr;
|
|
|
|
|
oc_pb_window window;
|
2009-09-28 02:14:21 +04:00
|
|
|
int bits;
|
|
|
|
|
int eof;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
void oc_pack_readinit(oc_pack_buf *_b,unsigned char *_buf,long _bytes);
|
|
|
|
|
int oc_pack_look1(oc_pack_buf *_b);
|
|
|
|
|
void oc_pack_adv1(oc_pack_buf *_b);
|
2009-01-22 03:00:49 +03:00
|
|
|
/*Here we assume 0<=_bits&&_bits<=32.*/
|
2010-11-08 10:47:34 +03:00
|
|
|
long oc_pack_read_c(oc_pack_buf *_b,int _bits);
|
|
|
|
|
int oc_pack_read1_c(oc_pack_buf *_b);
|
2009-09-28 02:14:21 +04:00
|
|
|
/* returns -1 for read beyond EOF, or the number of whole bytes available */
|
|
|
|
|
long oc_pack_bytes_left(oc_pack_buf *_b);
|
2009-01-22 03:00:49 +03:00
|
|
|
|
|
|
|
|
/*These two functions are implemented locally in huffdec.c*/
|
|
|
|
|
/*Read in bits without advancing the bitptr.
|
|
|
|
|
Here we assume 0<=_bits&&_bits<=32.*/
|
2009-09-28 02:14:21 +04:00
|
|
|
/*static int oc_pack_look(oc_pack_buf *_b,int _bits);*/
|
|
|
|
|
/*static void oc_pack_adv(oc_pack_buf *_b,int _bits);*/
|
2009-01-22 03:00:49 +03:00
|
|
|
|
|
|
|
|
#endif
|
