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  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.  
  190.  
  191.  
  192.