The Tor Browser: media/libtheora/lib/bitpack.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /********************************************************************

     2  *                                                                  *

     3  * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *

     4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

     5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

     6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

     7  *                                                                  *

     8  * THE OggTheora SOURCE CODE IS (C) COPYRIGHT 1994-2009             *

     9  * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *

    10  *                                                                  *

    11  ********************************************************************

    13   function: packing variable sized words into an octet stream

    14   last mod: $Id: bitwise.c 7675 2004-09-01 00:34:39Z xiphmont $

    16  ********************************************************************/

    17 #if !defined(_bitpack_H)

    18 # define _bitpack_H (1)

    19 # include <stddef.h>

    20 # include <limits.h>

    21 # include "internal.h"

    25 typedef size_t             oc_pb_window;

    26 typedef struct oc_pack_buf oc_pack_buf;

    30 /*Custom bitpacker implementations.*/

    31 # if defined(OC_ARM_ASM)

    32 #  include "arm/armbits.h"

    33 # endif

    35 # if !defined(oc_pack_read)

    36 #  define oc_pack_read oc_pack_read_c

    37 # endif

    38 # if !defined(oc_pack_read1)

    39 #  define oc_pack_read1 oc_pack_read1_c

    40 # endif

    41 # if !defined(oc_huff_token_decode)

    42 #  define oc_huff_token_decode oc_huff_token_decode_c

    43 # endif

    45 # define OC_PB_WINDOW_SIZE ((int)sizeof(oc_pb_window)*CHAR_BIT)

    46 /*This is meant to be a large, positive constant that can still be efficiently

    47    loaded as an immediate (on platforms like ARM, for example).

    48   Even relatively modest values like 100 would work fine.*/

    49 # define OC_LOTS_OF_BITS (0x40000000)

    53 struct oc_pack_buf{

    54   const unsigned char *stop;

    55   const unsigned char *ptr;

    56   oc_pb_window         window;

    57   int                  bits;

    58   int                  eof;

    59 };

    61 void oc_pack_readinit(oc_pack_buf *_b,unsigned char *_buf,long _bytes);

    62 int oc_pack_look1(oc_pack_buf *_b);

    63 void oc_pack_adv1(oc_pack_buf *_b);

    64 /*Here we assume 0<=_bits&&_bits<=32.*/

    65 long oc_pack_read_c(oc_pack_buf *_b,int _bits);

    66 int oc_pack_read1_c(oc_pack_buf *_b);

    67 /* returns -1 for read beyond EOF, or the number of whole bytes available */

    68 long oc_pack_bytes_left(oc_pack_buf *_b);

    70 /*These two functions are implemented locally in huffdec.c*/

    71 /*Read in bits without advancing the bitptr.

    72   Here we assume 0<=_bits&&_bits<=32.*/

    73 /*static int oc_pack_look(oc_pack_buf *_b,int _bits);*/

    74 /*static void oc_pack_adv(oc_pack_buf *_b,int _bits);*/

    76 #endif

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