Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8619 | maxcodehac | 1 | /* |
| 2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
||
| 3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
||
| 4 | * Copyright (c) 2001-2003, David Janssens |
||
| 5 | * Copyright (c) 2002-2003, Yannick Verschueren |
||
| 6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
||
| 7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
||
| 8 | * All rights reserved. |
||
| 9 | * |
||
| 10 | * Redistribution and use in source and binary forms, with or without |
||
| 11 | * modification, are permitted provided that the following conditions |
||
| 12 | * are met: |
||
| 13 | * 1. Redistributions of source code must retain the above copyright |
||
| 14 | * notice, this list of conditions and the following disclaimer. |
||
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
||
| 16 | * notice, this list of conditions and the following disclaimer in the |
||
| 17 | * documentation and/or other materials provided with the distribution. |
||
| 18 | * |
||
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
||
| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
||
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
||
| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
||
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
||
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
||
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
||
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
||
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
||
| 30 | */ |
||
| 31 | |||
| 32 | #include "opj_includes.h" |
||
| 33 | |||
| 34 | /* ----------------------------------------------------------------------- */ |
||
| 35 | |||
| 36 | opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) { |
||
| 37 | opj_cp_t *cp = NULL; |
||
| 38 | opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t)); |
||
| 39 | if(!cio) return NULL; |
||
| 40 | cio->cinfo = cinfo; |
||
| 41 | if(buffer && length) { |
||
| 42 | /* wrap a user buffer containing the encoded image */ |
||
| 43 | cio->openmode = OPJ_STREAM_READ; |
||
| 44 | cio->buffer = buffer; |
||
| 45 | cio->length = length; |
||
| 46 | } |
||
| 47 | else if(!buffer && !length && cinfo) { |
||
| 48 | /* allocate a buffer for the encoded image */ |
||
| 49 | cio->openmode = OPJ_STREAM_WRITE; |
||
| 50 | switch(cinfo->codec_format) { |
||
| 51 | case CODEC_J2K: |
||
| 52 | cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp; |
||
| 53 | break; |
||
| 54 | case CODEC_JP2: |
||
| 55 | cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp; |
||
| 56 | break; |
||
| 57 | default: |
||
| 58 | opj_free(cio); |
||
| 59 | return NULL; |
||
| 60 | } |
||
| 61 | cio->length = (unsigned int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */ |
||
| 62 | cio->buffer = (unsigned char *)opj_malloc(cio->length); |
||
| 63 | if(!cio->buffer) { |
||
| 64 | opj_event_msg(cio->cinfo, EVT_ERROR, "Error allocating memory for compressed bitstream\n"); |
||
| 65 | opj_free(cio); |
||
| 66 | return NULL; |
||
| 67 | } |
||
| 68 | } |
||
| 69 | else { |
||
| 70 | opj_free(cio); |
||
| 71 | return NULL; |
||
| 72 | } |
||
| 73 | |||
| 74 | /* Initialize byte IO */ |
||
| 75 | cio->start = cio->buffer; |
||
| 76 | cio->end = cio->buffer + cio->length; |
||
| 77 | cio->bp = cio->buffer; |
||
| 78 | |||
| 79 | return cio; |
||
| 80 | } |
||
| 81 | |||
| 82 | void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) { |
||
| 83 | if(cio) { |
||
| 84 | if(cio->openmode == OPJ_STREAM_WRITE) { |
||
| 85 | /* destroy the allocated buffer */ |
||
| 86 | opj_free(cio->buffer); |
||
| 87 | } |
||
| 88 | /* destroy the cio */ |
||
| 89 | opj_free(cio); |
||
| 90 | } |
||
| 91 | } |
||
| 92 | |||
| 93 | |||
| 94 | /* ----------------------------------------------------------------------- */ |
||
| 95 | |||
| 96 | /* |
||
| 97 | * Get position in byte stream. |
||
| 98 | */ |
||
| 99 | int OPJ_CALLCONV cio_tell(opj_cio_t *cio) { |
||
| 100 | return cio->bp - cio->start; |
||
| 101 | } |
||
| 102 | |||
| 103 | /* |
||
| 104 | * Set position in byte stream. |
||
| 105 | * |
||
| 106 | * pos : position, in number of bytes, from the beginning of the stream |
||
| 107 | */ |
||
| 108 | void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) { |
||
| 109 | cio->bp = cio->start + pos; |
||
| 110 | } |
||
| 111 | |||
| 112 | /* |
||
| 113 | * Number of bytes left before the end of the stream. |
||
| 114 | */ |
||
| 115 | int cio_numbytesleft(opj_cio_t *cio) { |
||
| 116 | return cio->end - cio->bp; |
||
| 117 | } |
||
| 118 | |||
| 119 | /* |
||
| 120 | * Get pointer to the current position in the stream. |
||
| 121 | */ |
||
| 122 | unsigned char *cio_getbp(opj_cio_t *cio) { |
||
| 123 | return cio->bp; |
||
| 124 | } |
||
| 125 | |||
| 126 | /* |
||
| 127 | * Write a byte. |
||
| 128 | */ |
||
| 129 | bool cio_byteout(opj_cio_t *cio, unsigned char v) { |
||
| 130 | if (cio->bp >= cio->end) { |
||
| 131 | opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n"); |
||
| 132 | return false; |
||
| 133 | } |
||
| 134 | *cio->bp++ = v; |
||
| 135 | return true; |
||
| 136 | } |
||
| 137 | |||
| 138 | /* |
||
| 139 | * Read a byte. |
||
| 140 | */ |
||
| 141 | unsigned char cio_bytein(opj_cio_t *cio) { |
||
| 142 | if (cio->bp >= cio->end) { |
||
| 143 | opj_event_msg(cio->cinfo, EVT_ERROR, "read error: passed the end of the codestream (start = %d, current = %d, end = %d\n", cio->start, cio->bp, cio->end); |
||
| 144 | return 0; |
||
| 145 | } |
||
| 146 | return *cio->bp++; |
||
| 147 | } |
||
| 148 | |||
| 149 | /* |
||
| 150 | * Write some bytes. |
||
| 151 | * |
||
| 152 | * v : value to write |
||
| 153 | * n : number of bytes to write |
||
| 154 | */ |
||
| 155 | unsigned int cio_write(opj_cio_t *cio, unsigned int v, int n) { |
||
| 156 | int i; |
||
| 157 | for (i = n - 1; i >= 0; i--) { |
||
| 158 | if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) ) |
||
| 159 | return 0; |
||
| 160 | } |
||
| 161 | return n; |
||
| 162 | } |
||
| 163 | |||
| 164 | /* |
||
| 165 | * Read some bytes. |
||
| 166 | * |
||
| 167 | * n : number of bytes to read |
||
| 168 | * |
||
| 169 | * return : value of the n bytes read |
||
| 170 | */ |
||
| 171 | unsigned int cio_read(opj_cio_t *cio, int n) { |
||
| 172 | int i; |
||
| 173 | unsigned int v; |
||
| 174 | v = 0; |
||
| 175 | for (i = n - 1; i >= 0; i--) { |
||
| 176 | v += cio_bytein(cio) << (i << 3); |
||
| 177 | } |
||
| 178 | return v; |
||
| 179 | } |
||
| 180 | |||
| 181 | /* |
||
| 182 | * Skip some bytes. |
||
| 183 | * |
||
| 184 | * n : number of bytes to skip |
||
| 185 | */ |
||
| 186 | void cio_skip(opj_cio_t *cio, int n) { |
||
| 187 | cio->bp += n; |
||
| 188 | } |
||
| 189 |