| 0,0 → 1,191 |
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| /* |
| * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
| * Copyright (c) 2002-2007, Professor Benoit Macq |
| * Copyright (c) 2001-2003, David Janssens |
| * Copyright (c) 2002-2003, Yannick Verschueren |
| * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
| * Copyright (c) 2005, Herve Drolon, FreeImage Team |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "opj_includes.h" |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) { |
| opj_cp_t *cp = NULL; |
| opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t)); |
| if(!cio) return NULL; |
| cio->cinfo = cinfo; |
| if(buffer && length) { |
| /* wrap a user buffer containing the encoded image */ |
| cio->openmode = OPJ_STREAM_READ; |
| cio->buffer = buffer; |
| cio->length = length; |
| } |
| else if(!buffer && !length && cinfo) { |
| /* allocate a buffer for the encoded image */ |
| cio->openmode = OPJ_STREAM_WRITE; |
| switch(cinfo->codec_format) { |
| case CODEC_J2K: |
| cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp; |
| break; |
| case CODEC_JP2: |
| cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp; |
| break; |
| default: |
| opj_free(cio); |
| return NULL; |
| } |
| cio->length = (unsigned int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */ |
| cio->buffer = (unsigned char *)opj_malloc(cio->length); |
| if(!cio->buffer) { |
| opj_event_msg(cio->cinfo, EVT_ERROR, "Error allocating memory for compressed bitstream\n"); |
| opj_free(cio); |
| return NULL; |
| } |
| } |
| else { |
| opj_free(cio); |
| return NULL; |
| } |
| |
| /* Initialize byte IO */ |
| cio->start = cio->buffer; |
| cio->end = cio->buffer + cio->length; |
| cio->bp = cio->buffer; |
| |
| return cio; |
| } |
| |
| void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) { |
| if(cio) { |
| if(cio->openmode == OPJ_STREAM_WRITE) { |
| /* destroy the allocated buffer */ |
| opj_free(cio->buffer); |
| } |
| /* destroy the cio */ |
| opj_free(cio); |
| } |
| } |
| |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* |
| * Get position in byte stream. |
| */ |
| int OPJ_CALLCONV cio_tell(opj_cio_t *cio) { |
| return cio->bp - cio->start; |
| } |
| |
| /* |
| * Set position in byte stream. |
| * |
| * pos : position, in number of bytes, from the beginning of the stream |
| */ |
| void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) { |
| cio->bp = cio->start + pos; |
| } |
| |
| /* |
| * Number of bytes left before the end of the stream. |
| */ |
| int cio_numbytesleft(opj_cio_t *cio) { |
| return cio->end - cio->bp; |
| } |
| |
| /* |
| * Get pointer to the current position in the stream. |
| */ |
| unsigned char *cio_getbp(opj_cio_t *cio) { |
| return cio->bp; |
| } |
| |
| /* |
| * Write a byte. |
| */ |
| bool cio_byteout(opj_cio_t *cio, unsigned char v) { |
| if (cio->bp >= cio->end) { |
| opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n"); |
| return false; |
| } |
| *cio->bp++ = v; |
| return true; |
| } |
| |
| /* |
| * Read a byte. |
| */ |
| unsigned char cio_bytein(opj_cio_t *cio) { |
| if (cio->bp >= cio->end) { |
| 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); |
| return 0; |
| } |
| return *cio->bp++; |
| } |
| |
| /* |
| * Write some bytes. |
| * |
| * v : value to write |
| * n : number of bytes to write |
| */ |
| unsigned int cio_write(opj_cio_t *cio, unsigned int v, int n) { |
| int i; |
| for (i = n - 1; i >= 0; i--) { |
| if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) ) |
| return 0; |
| } |
| return n; |
| } |
| |
| /* |
| * Read some bytes. |
| * |
| * n : number of bytes to read |
| * |
| * return : value of the n bytes read |
| */ |
| unsigned int cio_read(opj_cio_t *cio, int n) { |
| int i; |
| unsigned int v; |
| v = 0; |
| for (i = n - 1; i >= 0; i--) { |
| v += cio_bytein(cio) << (i << 3); |
| } |
| return v; |
| } |
| |
| /* |
| * Skip some bytes. |
| * |
| * n : number of bytes to skip |
| */ |
| void cio_skip(opj_cio_t *cio, int n) { |
| cio->bp += n; |
| } |
| |
| |
| |
| Property changes: |
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| Added: svn:executable |
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| +* |
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| \ No newline at end of property |
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