The Tor Browser / file comparison
comparison: media/libtheora/lib/bitpack.h
media/libtheora/lib/bitpack.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:ea4e9db2612d |
|---|---|
| 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 ******************************************************************** | |
| 12 | |
| 13 function: packing variable sized words into an octet stream | |
| 14 last mod: $Id: bitwise.c 7675 2004-09-01 00:34:39Z xiphmont $ | |
| 15 | |
| 16 ********************************************************************/ | |
| 17 #if !defined(_bitpack_H) | |
| 18 # define _bitpack_H (1) | |
| 19 # include <stddef.h> | |
| 20 # include <limits.h> | |
| 21 # include "internal.h" | |
| 22 | |
| 23 | |
| 24 | |
| 25 typedef size_t oc_pb_window; | |
| 26 typedef struct oc_pack_buf oc_pack_buf; | |
| 27 | |
| 28 | |
| 29 | |
| 30 /*Custom bitpacker implementations.*/ | |
| 31 # if defined(OC_ARM_ASM) | |
| 32 # include "arm/armbits.h" | |
| 33 # endif | |
| 34 | |
| 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 | |
| 44 | |
| 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) | |
| 50 | |
| 51 | |
| 52 | |
| 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 }; | |
| 60 | |
| 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); | |
| 69 | |
| 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);*/ | |
| 75 | |
| 76 #endif |
