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| 8436 | maxcodehac | 1 | /* |
| 2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
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| 3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
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| 4 | * Copyright (c) 2001-2003, David Janssens |
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| 5 | * Copyright (c) 2002-2003, Yannick Verschueren |
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| 6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
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| 7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
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| 8 | * All rights reserved. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * 1. Redistributions of source code must retain the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer. |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in the |
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| 17 | * documentation and/or other materials provided with the distribution. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
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| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 29 | * POSSIBILITY OF SUCH DAMAGE. |
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| 30 | */ |
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| 31 | |||
| 32 | #include "opj_includes.h" |
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| 33 | |||
| 34 | /** @defgroup BIO BIO - Individual bit input-output stream */ |
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| 35 | /*@{*/ |
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| 36 | |||
| 37 | /** @name Local static functions */ |
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| 38 | /*@{*/ |
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| 39 | |||
| 40 | /** |
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| 41 | Write a bit |
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| 42 | @param bio BIO handle |
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| 43 | @param b Bit to write (0 or 1) |
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| 44 | */ |
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| 45 | static void bio_putbit(opj_bio_t *bio, int b); |
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| 46 | /** |
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| 47 | Read a bit |
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| 48 | @param bio BIO handle |
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| 49 | @return Returns the read bit |
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| 50 | */ |
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| 51 | static int bio_getbit(opj_bio_t *bio); |
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| 52 | /** |
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| 53 | Write a byte |
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| 54 | @param bio BIO handle |
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| 55 | @return Returns 0 if successful, returns 1 otherwise |
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| 56 | */ |
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| 57 | static int bio_byteout(opj_bio_t *bio); |
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| 58 | /** |
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| 59 | Read a byte |
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| 60 | @param bio BIO handle |
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| 61 | @return Returns 0 if successful, returns 1 otherwise |
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| 62 | */ |
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| 63 | static int bio_bytein(opj_bio_t *bio); |
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| 64 | |||
| 65 | /*@}*/ |
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| 66 | |||
| 67 | /*@}*/ |
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| 68 | |||
| 69 | /* |
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| 70 | ========================================================== |
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| 71 | local functions |
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| 72 | ========================================================== |
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| 73 | */ |
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| 74 | |||
| 75 | static int bio_byteout(opj_bio_t *bio) { |
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| 76 | bio->buf = (bio->buf << 8) & 0xffff; |
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| 77 | bio->ct = bio->buf == 0xff00 ? 7 : 8; |
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| 78 | if (bio->bp >= bio->end) { |
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| 79 | return 1; |
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| 80 | } |
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| 81 | *bio->bp++ = bio->buf >> 8; |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |||
| 85 | static int bio_bytein(opj_bio_t *bio) { |
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| 86 | bio->buf = (bio->buf << 8) & 0xffff; |
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| 87 | bio->ct = bio->buf == 0xff00 ? 7 : 8; |
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| 88 | if (bio->bp >= bio->end) { |
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| 89 | return 1; |
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| 90 | } |
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| 91 | bio->buf |= *bio->bp++; |
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| 92 | return 0; |
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| 93 | } |
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| 94 | |||
| 95 | static void bio_putbit(opj_bio_t *bio, int b) { |
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| 96 | if (bio->ct == 0) { |
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| 97 | bio_byteout(bio); |
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| 98 | } |
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| 99 | bio->ct--; |
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| 100 | bio->buf |= b << bio->ct; |
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| 101 | } |
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| 102 | |||
| 103 | static int bio_getbit(opj_bio_t *bio) { |
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| 104 | if (bio->ct == 0) { |
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| 105 | bio_bytein(bio); |
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| 106 | } |
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| 107 | bio->ct--; |
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| 108 | return (bio->buf >> bio->ct) & 1; |
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| 109 | } |
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| 110 | |||
| 111 | /* |
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| 112 | ========================================================== |
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| 113 | Bit Input/Output interface |
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| 114 | ========================================================== |
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| 115 | */ |
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| 116 | |||
| 117 | opj_bio_t* bio_create(void) { |
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| 118 | opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t)); |
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| 119 | return bio; |
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| 120 | } |
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| 121 | |||
| 122 | void bio_destroy(opj_bio_t *bio) { |
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| 123 | if(bio) { |
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| 124 | opj_free(bio); |
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| 125 | } |
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| 126 | } |
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| 127 | |||
| 128 | int bio_numbytes(opj_bio_t *bio) { |
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| 129 | return (bio->bp - bio->start); |
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| 130 | } |
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| 131 | |||
| 132 | void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) { |
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| 133 | bio->start = bp; |
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| 134 | bio->end = bp + len; |
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| 135 | bio->bp = bp; |
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| 136 | bio->buf = 0; |
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| 137 | bio->ct = 8; |
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| 138 | } |
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| 139 | |||
| 140 | void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) { |
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| 141 | bio->start = bp; |
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| 142 | bio->end = bp + len; |
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| 143 | bio->bp = bp; |
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| 144 | bio->buf = 0; |
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| 145 | bio->ct = 0; |
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| 146 | } |
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| 147 | |||
| 148 | void bio_write(opj_bio_t *bio, int v, int n) { |
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| 149 | int i; |
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| 150 | for (i = n - 1; i >= 0; i--) { |
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| 151 | bio_putbit(bio, (v >> i) & 1); |
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| 152 | } |
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| 153 | } |
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| 154 | |||
| 155 | int bio_read(opj_bio_t *bio, int n) { |
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| 156 | int i, v; |
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| 157 | v = 0; |
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| 158 | for (i = n - 1; i >= 0; i--) { |
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| 159 | v += bio_getbit(bio) << i; |
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| 160 | } |
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| 161 | return v; |
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| 162 | } |
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| 163 | |||
| 164 | int bio_flush(opj_bio_t *bio) { |
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| 165 | bio->ct = 0; |
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| 166 | if (bio_byteout(bio)) { |
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| 167 | return 1; |
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| 168 | } |
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| 169 | if (bio->ct == 7) { |
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| 170 | bio->ct = 0; |
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| 171 | if (bio_byteout(bio)) { |
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| 172 | return 1; |
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| 173 | } |
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| 174 | } |
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| 175 | return 0; |
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| 176 | } |
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| 177 | |||
| 178 | int bio_inalign(opj_bio_t *bio) { |
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| 179 | bio->ct = 0; |
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| 180 | if ((bio->buf & 0xff) == 0xff) { |
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| 181 | if (bio_bytein(bio)) { |
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| 182 | return 1; |
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| 183 | } |
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| 184 | bio->ct = 0; |
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| 185 | } |
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| 186 | return 0; |
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| 187 | } |