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| 4758 | right-hear | 1 | /* |
| 2 | * Copyright (c) 2001-2003, David Janssens |
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| 3 | * Copyright (c) 2002-2003, Yannick Verschueren |
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| 4 | * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe |
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| 5 | * Copyright (c) 2005, Hervé Drolon, FreeImage Team |
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| 6 | * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium |
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| 7 | * All rights reserved. |
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| 8 | * |
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| 9 | * Redistribution and use in source and binary forms, with or without |
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| 10 | * modification, are permitted provided that the following conditions |
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| 11 | * are met: |
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| 12 | * 1. Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
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| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | * POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | #include "opj_includes.h" |
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| 32 | |||
| 33 | /* ----------------------------------------------------------------------- */ |
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| 34 | |||
| 35 | opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) { |
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| 36 | opj_cp_t *cp = NULL; |
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| 37 | opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t)); |
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| 38 | if(!cio) return NULL; |
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| 39 | cio->cinfo = cinfo; |
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| 40 | if(buffer && length) { |
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| 41 | /* wrap a user buffer containing the encoded image */ |
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| 42 | cio->openmode = OPJ_STREAM_READ; |
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| 43 | cio->buffer = buffer; |
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| 44 | cio->length = length; |
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| 45 | } |
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| 46 | else if(!buffer && !length && cinfo) { |
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| 47 | /* allocate a buffer for the encoded image */ |
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| 48 | cio->openmode = OPJ_STREAM_WRITE; |
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| 49 | switch(cinfo->codec_format) { |
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| 50 | case CODEC_J3D: |
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| 51 | case CODEC_J2K: |
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| 52 | cp = ((opj_j3d_t*)cinfo->j3d_handle)->cp; |
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| 53 | break; |
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| 54 | default: |
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| 55 | opj_free(cio); |
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| 56 | return NULL; |
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| 57 | } |
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| 58 | cio->length = cp->tdx * cp->tdy * cp->tdz * cp->tw * cp->th * cp->tl * 4; |
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| 59 | cio->buffer = (unsigned char *)opj_malloc(cio->length); |
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| 60 | if(!cio->buffer) { |
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| 61 | opj_free(cio); |
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| 62 | return NULL; |
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| 63 | } |
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| 64 | } |
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| 65 | else { |
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| 66 | opj_free(cio); |
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| 67 | return NULL; |
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| 68 | } |
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| 69 | |||
| 70 | /* Initialize byte IO */ |
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| 71 | cio->start = cio->buffer; |
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| 72 | cio->end = cio->buffer + cio->length; |
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| 73 | cio->bp = cio->buffer; |
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| 74 | |||
| 75 | return cio; |
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| 76 | } |
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| 77 | |||
| 78 | void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) { |
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| 79 | if(cio) { |
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| 80 | if(cio->openmode == OPJ_STREAM_WRITE) { |
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| 81 | /* destroy the allocated buffer */ |
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| 82 | opj_free(cio->buffer); |
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| 83 | } |
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| 84 | /* destroy the cio */ |
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| 85 | opj_free(cio); |
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| 86 | } |
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| 87 | } |
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| 88 | |||
| 89 | |||
| 90 | /* ----------------------------------------------------------------------- */ |
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| 91 | |||
| 92 | /* |
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| 93 | * Get position in byte stream. |
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| 94 | */ |
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| 95 | int OPJ_CALLCONV cio_tell(opj_cio_t *cio) { |
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| 96 | return cio->bp - cio->start; |
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| 97 | } |
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| 98 | |||
| 99 | /* |
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| 100 | * Set position in byte stream. |
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| 101 | * |
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| 102 | * pos : position, in number of bytes, from the beginning of the stream |
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| 103 | */ |
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| 104 | void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) { |
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| 105 | cio->bp = cio->start + pos; |
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| 106 | } |
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| 107 | |||
| 108 | /* |
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| 109 | * Number of bytes left before the end of the stream. |
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| 110 | */ |
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| 111 | int cio_numbytesleft(opj_cio_t *cio) { |
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| 112 | return cio->end - cio->bp; |
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| 113 | } |
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| 114 | |||
| 115 | /* |
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| 116 | * Get pointer to the current position in the stream. |
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| 117 | */ |
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| 118 | unsigned char *cio_getbp(opj_cio_t *cio) { |
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| 119 | return cio->bp; |
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| 120 | } |
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| 121 | |||
| 122 | /* |
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| 123 | * Write a byte. |
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| 124 | */ |
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| 125 | bool cio_byteout(opj_cio_t *cio, unsigned char v) { |
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| 126 | if (cio->bp >= cio->end) { |
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| 127 | opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n"); |
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| 128 | return false; |
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| 129 | } |
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| 130 | *cio->bp++ = v; |
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| 131 | return true; |
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| 132 | } |
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| 133 | |||
| 134 | /* |
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| 135 | * Read a byte. |
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| 136 | */ |
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| 137 | unsigned char cio_bytein(opj_cio_t *cio) { |
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| 138 | if (cio->bp >= cio->end) { |
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| 139 | opj_event_msg(cio->cinfo, EVT_ERROR, "read error\n"); |
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| 140 | return 0; |
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| 141 | } |
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| 142 | return *cio->bp++; |
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| 143 | } |
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| 144 | |||
| 145 | /* |
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| 146 | * Write some bytes. |
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| 147 | * |
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| 148 | * v : value to write |
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| 149 | * n : number of bytes to write |
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| 150 | */ |
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| 151 | unsigned int cio_write(opj_cio_t *cio, unsigned int v, int n) { |
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| 152 | int i; |
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| 153 | for (i = n - 1; i >= 0; i--) { |
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| 154 | if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) ) |
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| 155 | return 0; |
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| 156 | } |
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| 157 | return n; |
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| 158 | } |
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| 159 | |||
| 160 | /* |
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| 161 | * Read some bytes. |
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| 162 | * |
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| 163 | * n : number of bytes to read |
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| 164 | * |
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| 165 | * return : value of the n bytes read |
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| 166 | */ |
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| 167 | unsigned int cio_read(opj_cio_t *cio, int n) { |
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| 168 | int i; |
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| 169 | unsigned int v; |
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| 170 | v = 0; |
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| 171 | for (i = n - 1; i >= 0; i--) { |
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| 172 | v += cio_bytein(cio) << (i << 3); |
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| 173 | } |
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| 174 | return v; |
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| 175 | } |
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| 176 | |||
| 177 | /* |
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| 178 | * Skip some bytes. |
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| 179 | * |
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| 180 | * n : number of bytes to skip |
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| 181 | */ |
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| 182 | void cio_skip(opj_cio_t *cio, int n) { |
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| 183 | cio->bp += n; |
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| 184 | } |
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| 185 | |||
| 186 | /* |
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| 187 | * Write some bytes. |
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| 188 | * |
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| 189 | * v : value to write |
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| 190 | * n : number of bytes to write |
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| 191 | */ |
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| 192 | int cio_write_int(opj_cio_t *cio, int v, int n) { |
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| 193 | int i; |
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| 194 | for (i = n - 1; i >= 0; i--) { |
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| 195 | if( !cio_byteout(cio, (char) ((v >> (i << 3)) & 0xff)) ) |
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| 196 | return 0; |
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| 197 | } |
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| 198 | return n; |
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| 199 | } |
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| 200 | |||
| 201 | /* |
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| 202 | * Read some bytes. |
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| 203 | * |
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| 204 | * n : number of bytes to read |
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| 205 | * |
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| 206 | * return : value of the n bytes read |
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| 207 | */ |
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| 208 | int cio_read_int(opj_cio_t *cio, int n) { |
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| 209 | int i; |
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| 210 | int v; |
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| 211 | v = 0; |
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| 212 | for (i = n - 1; i >= 0; i--) { |
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| 213 | v += cio_bytein(cio) << (i << 3); |
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| 214 | } |
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| 215 | return v; |
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| 216 | } |
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| 217 |