1000 lines
30 KiB
C
1000 lines
30 KiB
C
/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2007, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opj_includes.h"
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/* ----------------------------------------------------------------------- */
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opj_cio_t* OPJ_CALLCONV opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) {
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opj_cp_t *cp = NULL;
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opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t));
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if(!cio) return NULL;
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cio->cinfo = cinfo;
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if(buffer && length) {
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/* wrap a user buffer containing the encoded image */
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cio->openmode = OPJ_STREAM_READ;
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cio->buffer = buffer;
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cio->length = length;
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}
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else if(!buffer && !length && cinfo) {
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/* allocate a buffer for the encoded image */
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cio->openmode = OPJ_STREAM_WRITE;
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switch(cinfo->codec_format) {
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case CODEC_J2K:
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cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp;
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break;
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case CODEC_JP2:
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cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp;
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break;
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default:
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opj_free(cio);
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return NULL;
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}
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cio->length = (int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */
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assert(cio->length >= 0);
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cio->buffer = (unsigned char *)opj_malloc((OPJ_SIZE_T)cio->length);
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if(!cio->buffer) {
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opj_event_msg(cio->cinfo, EVT_ERROR, "Error allocating memory for compressed bitstream\n");
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opj_free(cio);
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return NULL;
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}
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}
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else {
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opj_free(cio);
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return NULL;
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}
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/* Initialize byte IO */
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cio->start = cio->buffer;
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cio->end = cio->buffer + cio->length;
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cio->bp = cio->buffer;
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return cio;
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}
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void OPJ_CALLCONV opj_cio_close(opj_cio_t *cio) {
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if(cio) {
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if(cio->openmode == OPJ_STREAM_WRITE) {
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/* destroy the allocated buffer */
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opj_free(cio->buffer);
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}
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/* destroy the cio */
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opj_free(cio);
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}
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}
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/* ----------------------------------------------------------------------- */
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/*
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* Get position in byte stream.
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*/
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OPJ_OFF_T OPJ_CALLCONV cio_tell(opj_cio_t *cio) {
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return cio->bp - cio->start;
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}
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/*
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* Set position in byte stream.
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*
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* pos : position, in number of bytes, from the beginning of the stream
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*/
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void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos) {
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cio->bp = cio->start + pos;
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}
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/*
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* Number of bytes left before the end of the stream.
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*/
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OPJ_SIZE_T cio_numbytesleft(opj_cio_t *cio) {
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const ptrdiff_t diff = cio->end - cio->bp;
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assert( diff >= 0 );
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return (OPJ_SIZE_T)diff;
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}
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/*
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* Get pointer to the current position in the stream.
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*/
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unsigned char *cio_getbp(opj_cio_t *cio) {
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return cio->bp;
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}
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/*
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* Write a byte.
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*/
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opj_bool cio_byteout(opj_cio_t *cio, unsigned char v) {
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if (cio->bp >= cio->end) {
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opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n");
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return OPJ_FALSE;
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}
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*cio->bp++ = v;
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return OPJ_TRUE;
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}
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/*
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* Read a byte.
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*/
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unsigned char cio_bytein(opj_cio_t *cio) {
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if (cio->bp >= cio->end) {
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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);
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return 0;
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}
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return *cio->bp++;
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}
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/*
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* Write some bytes.
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*
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* v : value to write
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* n : number of bytes to write
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*/
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unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n) {
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int i;
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for (i = n - 1; i >= 0; i--) {
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if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) )
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return 0;
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}
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assert( n >= 0 );
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return (unsigned int)n;
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}
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/*
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* Read some bytes.
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*
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* n : number of bytes to read
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*
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* return : value of the n bytes read
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*/
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unsigned int cio_read(opj_cio_t *cio, int n) {
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int i;
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unsigned int v = 0;
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for (i = n - 1; i >= 0; i--) {
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const unsigned int c = cio_bytein(cio);
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v += c << (i << 3);
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}
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return v;
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}
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/*
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* Skip some bytes.
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*
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* n : number of bytes to skip
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*/
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void cio_skip(opj_cio_t *cio, int n) {
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cio->bp += n;
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}
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/* ----------------------------------------------------------------------- */
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/**
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @param p_nb_bytes the number of bytes to write
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*/
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void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes;
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assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
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memcpy(p_buffer,l_data_ptr,p_nb_bytes);
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}
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @param p_nb_bytes the number of bytes to write
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* @return the number of bytes written or -1 if an error occured
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*/
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void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
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OPJ_UINT32 i;
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assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
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for (i=0;i<p_nb_bytes;++i) {
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*(p_buffer++) = *(l_data_ptr--);
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}
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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* @param p_nb_bytes the nb bytes to read.
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* @return the number of bytes read or -1 if an error occured.
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*/
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void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
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assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
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*p_value = 0;
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memcpy(l_data_ptr+4-p_nb_bytes,p_buffer,p_nb_bytes);
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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* @param p_nb_bytes the nb bytes to read.
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* @return the number of bytes read or -1 if an error occured.
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*/
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void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
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OPJ_UINT32 i;
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assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
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*p_value = 0;
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for (i=0;i<p_nb_bytes;++i) {
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*(l_data_ptr--) = *(p_buffer++);
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}
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}
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/**
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @return the number of bytes written or -1 if an error occured
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*/
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void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
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memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
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}
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
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OPJ_UINT32 i;
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for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
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*(p_buffer++) = *(l_data_ptr--);
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}
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
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memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
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OPJ_UINT32 i;
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for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
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*(l_data_ptr--) = *(p_buffer++);
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}
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}
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/**
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @return the number of bytes written or -1 if an error occured
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*/
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void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
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memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
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}
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
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{
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const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
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OPJ_UINT32 i;
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for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
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*(p_buffer++) = *(l_data_ptr--);
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}
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
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memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
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}
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
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{
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OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
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OPJ_UINT32 i;
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for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
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*(l_data_ptr--) = *(p_buffer++);
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}
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}
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/**
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* Creates an abstract stream. This function does nothing except allocating memory and initializing the abstract stream.
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* @return a stream object.
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*/
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opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,opj_bool l_is_input)
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{
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opj_stream_private_t * l_stream = 00;
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l_stream = (opj_stream_private_t*) opj_malloc(sizeof(opj_stream_private_t));
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if (! l_stream) {
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return 00;
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}
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memset(l_stream,0,sizeof(opj_stream_private_t));
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l_stream->m_buffer_size = p_buffer_size;
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l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
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if (! l_stream->m_stored_data) {
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opj_free(l_stream);
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return 00;
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}
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l_stream->m_current_data = l_stream->m_stored_data;
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if (l_is_input) {
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l_stream->m_status |= opj_stream_e_input;
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l_stream->m_opj_skip = opj_stream_read_skip;
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l_stream->m_opj_seek = opj_stream_read_seek;
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}
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else {
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l_stream->m_status |= opj_stream_e_output;
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l_stream->m_opj_skip = opj_stream_write_skip;
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l_stream->m_opj_seek = opj_stream_write_seek;
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}
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l_stream->m_read_fn = opj_stream_default_read;
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l_stream->m_write_fn = opj_stream_default_write;
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l_stream->m_skip_fn = opj_stream_default_skip;
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l_stream->m_seek_fn = opj_stream_default_seek;
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return (opj_stream_t *) l_stream;
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}
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/**
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* Creates an abstract stream. This function does nothing except allocating memory and initializing the abstract stream.
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* @return a stream object.
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*/
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opj_stream_t* OPJ_CALLCONV opj_stream_default_create(opj_bool l_is_input)
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{
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return opj_stream_create(J2K_STREAM_CHUNK_SIZE,l_is_input);
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}
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/**
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* Destroys a stream created by opj_create_stream. This function does NOT close the abstract stream. If needed the user must
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* close its own implementation of the stream.
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*/
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OPJ_API void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
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{
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opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
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if (l_stream) {
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opj_free(l_stream->m_stored_data);
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l_stream->m_stored_data = 00;
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opj_free(l_stream);
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}
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}
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/**
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* Sets the given function to be used as a read function.
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* @param p_stream the stream to modify
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* @param p_function the function to use a read function.
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*/
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OPJ_API void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
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{
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opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
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if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
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return;
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}
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l_stream->m_read_fn = p_function;
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}
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OPJ_API void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
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{
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opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
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if
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(!l_stream)
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{
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return;
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}
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l_stream->m_seek_fn = p_function;
|
|
}
|
|
|
|
/**
|
|
* Sets the given function to be used as a write function.
|
|
* @param p_stream the stream to modify
|
|
* @param p_function the function to use a write function.
|
|
*/
|
|
OPJ_API void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
|
|
{
|
|
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
|
|
if
|
|
((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output)))
|
|
{
|
|
return;
|
|
}
|
|
l_stream->m_write_fn = p_function;
|
|
}
|
|
|
|
/**
|
|
* Sets the given function to be used as a skip function.
|
|
* @param p_stream the stream to modify
|
|
* @param p_function the function to use a skip function.
|
|
*/
|
|
OPJ_API void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
|
|
{
|
|
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
|
|
if
|
|
(! l_stream)
|
|
{
|
|
return;
|
|
}
|
|
l_stream->m_skip_fn = p_function;
|
|
}
|
|
|
|
/**
|
|
* Sets the given data to be used as a user data for the stream.
|
|
* @param p_stream the stream to modify
|
|
* @param p_data the data to set.
|
|
*/
|
|
OPJ_API void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data)
|
|
{
|
|
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
|
|
l_stream->m_user_data = p_data;
|
|
}
|
|
|
|
/**
|
|
* Sets the given data to be used as a user data for the stream.
|
|
* @param p_stream the stream to modify
|
|
* @param p_data the data to set.
|
|
*/
|
|
OPJ_API void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
|
|
{
|
|
opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
|
|
l_stream->m_user_data_length = data_length;
|
|
}
|
|
|
|
/**
|
|
* Reads some bytes from the stream.
|
|
* @param p_stream the stream to read data from.
|
|
* @param p_buffer pointer to the data buffer that will receive the data.
|
|
* @param p_size number of bytes to read.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes read, or -1 if an error occured or if the stream is at the end.
|
|
*/
|
|
OPJ_SIZE_T opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_SIZE_T l_read_nb_bytes = 0;
|
|
if (p_stream->m_bytes_in_buffer >= p_size) {
|
|
memcpy(p_buffer,p_stream->m_current_data,p_size);
|
|
p_stream->m_current_data += p_size;
|
|
p_stream->m_bytes_in_buffer -= p_size;
|
|
l_read_nb_bytes += p_size;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
|
|
return l_read_nb_bytes;
|
|
}
|
|
|
|
/* we are now in the case when the remaining data if not sufficient */
|
|
if (p_stream->m_status & opj_stream_e_end) {
|
|
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
|
|
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
|
|
p_stream->m_current_data += p_stream->m_bytes_in_buffer;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
|
|
}
|
|
|
|
/* the flag is not set, we copy data and then do an actual read on the stream */
|
|
if (p_stream->m_bytes_in_buffer) {
|
|
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
|
|
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_buffer += p_stream->m_bytes_in_buffer;
|
|
p_size -= p_stream->m_bytes_in_buffer;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
}
|
|
else {
|
|
/* case where we are already at the end of the buffer
|
|
so reset the m_current_data to point to the start of the
|
|
stored buffer to get ready to read from disk*/
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
}
|
|
|
|
|
|
while(1){
|
|
/* we should read less than a chunk -> read a chunk */
|
|
if (p_size < p_stream->m_buffer_size) {
|
|
/* we should do an actual read on the media */
|
|
p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_stream->m_stored_data,p_stream->m_buffer_size,p_stream->m_user_data);
|
|
|
|
if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
|
|
/* end of stream */
|
|
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
|
|
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
p_stream->m_status |= opj_stream_e_end;
|
|
/* end of stream */
|
|
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
|
|
}
|
|
else if (p_stream->m_bytes_in_buffer < p_size) {
|
|
/* not enough data */
|
|
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
|
|
memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_buffer += p_stream->m_bytes_in_buffer;
|
|
p_size -= p_stream->m_bytes_in_buffer;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
}
|
|
else {
|
|
l_read_nb_bytes += p_size;
|
|
memcpy(p_buffer,p_stream->m_current_data,p_size);
|
|
p_stream->m_current_data += p_size;
|
|
p_stream->m_bytes_in_buffer -= p_size;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
|
|
return l_read_nb_bytes;
|
|
}
|
|
}
|
|
else {
|
|
/* direct read on the dest buffer */
|
|
p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);
|
|
|
|
if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
|
|
/* end of stream */
|
|
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
|
|
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
p_stream->m_status |= opj_stream_e_end;
|
|
/* end of stream */
|
|
return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
|
|
}
|
|
else if (p_stream->m_bytes_in_buffer < p_size) {
|
|
/* not enough data */
|
|
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_buffer += p_stream->m_bytes_in_buffer;
|
|
p_size -= p_stream->m_bytes_in_buffer;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
}
|
|
else {
|
|
/* we have read the exact size */
|
|
l_read_nb_bytes += p_stream->m_bytes_in_buffer;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
return l_read_nb_bytes;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Writes some bytes from the stream.
|
|
* @param p_stream the stream to write data to.
|
|
* @param p_buffer pointer to the data buffer holds the data to be writtent.
|
|
* @param p_size number of bytes to write.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes writtent, or -1 if an error occured.
|
|
*/
|
|
OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
|
|
const OPJ_BYTE * p_buffer,
|
|
OPJ_SIZE_T p_size,
|
|
opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_SIZE_T l_remaining_bytes = 0;
|
|
OPJ_SIZE_T l_write_nb_bytes = 0;
|
|
|
|
if (p_stream->m_status & opj_stream_e_error) {
|
|
return (OPJ_SIZE_T)-1;
|
|
}
|
|
|
|
while(1) {
|
|
l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;
|
|
|
|
/* we have more memory than required */
|
|
if (l_remaining_bytes >= p_size) {
|
|
memcpy(p_stream->m_current_data, p_buffer, p_size);
|
|
|
|
p_stream->m_current_data += p_size;
|
|
p_stream->m_bytes_in_buffer += p_size;
|
|
l_write_nb_bytes += p_size;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
|
|
|
|
return l_write_nb_bytes;
|
|
}
|
|
|
|
/* we copy data and then do an actual read on the stream */
|
|
if (l_remaining_bytes) {
|
|
l_write_nb_bytes += l_remaining_bytes;
|
|
|
|
memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);
|
|
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
|
|
p_buffer += l_remaining_bytes;
|
|
p_size -= l_remaining_bytes;
|
|
p_stream->m_bytes_in_buffer += l_remaining_bytes;
|
|
p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
|
|
}
|
|
|
|
if (opj_stream_flush(p_stream, p_event_mgr) == EXIT_FAILURE) {
|
|
return (OPJ_SIZE_T)-1;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Writes the content of the stream buffer to the stream.
|
|
* @param p_stream the stream to write data to.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes written, or -1 if an error occured.
|
|
*/
|
|
opj_bool opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
/* the number of bytes written on the media. */
|
|
OPJ_SIZE_T l_current_write_nb_bytes = 0;
|
|
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
|
|
while (p_stream->m_bytes_in_buffer) {
|
|
/* we should do an actual write on the media */
|
|
l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
|
|
p_stream->m_bytes_in_buffer,
|
|
p_stream->m_user_data);
|
|
|
|
if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Error on writting stream!\n");
|
|
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
p_stream->m_current_data += l_current_write_nb_bytes;
|
|
p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
|
|
}
|
|
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Skips a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes skipped, or -1 if an error occured.
|
|
*/
|
|
OPJ_OFF_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_OFF_T l_skip_nb_bytes = 0;
|
|
OPJ_OFF_T l_current_skip_nb_bytes = 0;
|
|
|
|
assert( p_size >= 0 );
|
|
if
|
|
(p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size)
|
|
{
|
|
p_stream->m_current_data += p_size;
|
|
/* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
|
|
which is of type OPJ_SIZE_T */
|
|
p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
|
|
l_skip_nb_bytes += p_size;
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
return l_skip_nb_bytes;
|
|
}
|
|
|
|
/* we are now in the case when the remaining data if not sufficient */
|
|
if
|
|
(p_stream->m_status & opj_stream_e_end)
|
|
{
|
|
l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_current_data += p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
|
|
}
|
|
|
|
/* the flag is not set, we copy data and then do an actual skip on the stream */
|
|
if
|
|
(p_stream->m_bytes_in_buffer)
|
|
{
|
|
l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
}
|
|
|
|
while
|
|
(p_size > 0)
|
|
{
|
|
/* we should do an actual skip on the media */
|
|
l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
|
|
if
|
|
(l_current_skip_nb_bytes == (OPJ_OFF_T) -1)
|
|
{
|
|
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
|
|
|
|
p_stream->m_status |= opj_stream_e_end;
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
/* end if stream */
|
|
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
|
|
}
|
|
p_size -= l_current_skip_nb_bytes;
|
|
l_skip_nb_bytes += l_current_skip_nb_bytes;
|
|
}
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
return l_skip_nb_bytes;
|
|
}
|
|
|
|
/**
|
|
* Skips a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes skipped, or -1 if an error occured.
|
|
*/
|
|
OPJ_OFF_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
opj_bool l_is_written = 0;
|
|
OPJ_OFF_T l_current_skip_nb_bytes = 0;
|
|
OPJ_OFF_T l_skip_nb_bytes = 0;
|
|
|
|
if
|
|
(p_stream->m_status & opj_stream_e_error)
|
|
{
|
|
return (OPJ_OFF_T) -1;
|
|
}
|
|
|
|
/* we should flush data */
|
|
l_is_written = opj_stream_flush (p_stream, p_event_mgr);
|
|
if
|
|
(! l_is_written)
|
|
{
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
p_stream->m_current_data = p_stream->m_current_data;
|
|
return (OPJ_OFF_T) -1;
|
|
}
|
|
/* then skip */
|
|
|
|
while
|
|
(p_size > 0)
|
|
{
|
|
/* we should do an actual skip on the media */
|
|
l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
|
|
if
|
|
(l_current_skip_nb_bytes == (OPJ_OFF_T)-1)
|
|
{
|
|
opj_event_msg_v2(p_event_mgr, EVT_INFO, "Stream error!\n");
|
|
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
/* end if stream */
|
|
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
|
|
}
|
|
p_size -= l_current_skip_nb_bytes;
|
|
l_skip_nb_bytes += l_current_skip_nb_bytes;
|
|
}
|
|
p_stream->m_byte_offset += l_skip_nb_bytes;
|
|
return l_skip_nb_bytes;
|
|
}
|
|
|
|
/**
|
|
* Tells the byte offset on the stream (similar to ftell).
|
|
*
|
|
* @param p_stream the stream to get the information from.
|
|
*
|
|
* @return the current position of the stream.
|
|
*/
|
|
OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
|
|
{
|
|
return p_stream->m_byte_offset;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the number of bytes left before the end of the stream (similar to cio_numbytesleft).
|
|
*
|
|
* @param p_stream the stream to get the information from.
|
|
*
|
|
* @return Number of bytes left before the end of the stream.
|
|
*/
|
|
OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
|
|
{
|
|
assert( p_stream->m_byte_offset >= 0 );
|
|
assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
|
|
return p_stream->m_user_data_length ?
|
|
(OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
|
|
0;
|
|
}
|
|
|
|
/**
|
|
* Skips a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes skipped, or -1 if an error occured.
|
|
*/
|
|
OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
assert(p_size >= 0);
|
|
return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
|
|
}
|
|
|
|
|
|
/**
|
|
* Skips a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes skipped, or -1 if an error occured.
|
|
*/
|
|
opj_bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_ARG_NOT_USED(p_event_mgr);
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
|
|
if( p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
|
|
p_stream->m_status |= opj_stream_e_end;
|
|
return EXIT_FAILURE;
|
|
}
|
|
else {
|
|
/* reset stream status */
|
|
p_stream->m_status &= (~opj_stream_e_end);
|
|
p_stream->m_byte_offset = p_size;
|
|
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Skips a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return the number of bytes skipped, or -1 if an error occured.
|
|
*/
|
|
opj_bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
if
|
|
(! opj_stream_flush(p_stream,p_event_mgr))
|
|
{
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_stream->m_bytes_in_buffer = 0;
|
|
|
|
if
|
|
(! p_stream->m_seek_fn(p_size,p_stream->m_user_data))
|
|
{
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
return EXIT_FAILURE;
|
|
}
|
|
else
|
|
{
|
|
p_stream->m_byte_offset = p_size;
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
|
|
/**
|
|
* Seeks a number of bytes from the stream.
|
|
* @param p_stream the stream to skip data from.
|
|
* @param p_size the number of bytes to skip.
|
|
* @param p_event_mgr the user event manager to be notified of special events.
|
|
* @return true if the stream is seekable.
|
|
*/
|
|
opj_bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
|
|
{
|
|
assert(p_size >= 0);
|
|
return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
|
|
}
|
|
|
|
/**
|
|
* Tells if the given stream is seekable.
|
|
*/
|
|
opj_bool opj_stream_has_seek (const opj_stream_private_t * p_stream)
|
|
{
|
|
return p_stream->m_seek_fn != opj_stream_default_seek;
|
|
}
|
|
|
|
OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
OPJ_ARG_NOT_USED(p_buffer);
|
|
OPJ_ARG_NOT_USED(p_nb_bytes);
|
|
OPJ_ARG_NOT_USED(p_user_data);
|
|
return (OPJ_SIZE_T) -1;
|
|
}
|
|
|
|
OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
OPJ_ARG_NOT_USED(p_buffer);
|
|
OPJ_ARG_NOT_USED(p_nb_bytes);
|
|
OPJ_ARG_NOT_USED(p_user_data);
|
|
return (OPJ_SIZE_T) -1;
|
|
}
|
|
|
|
OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
OPJ_ARG_NOT_USED(p_nb_bytes);
|
|
OPJ_ARG_NOT_USED(p_user_data);
|
|
return (OPJ_OFF_T) -1;
|
|
}
|
|
|
|
opj_bool opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
OPJ_ARG_NOT_USED(p_nb_bytes);
|
|
OPJ_ARG_NOT_USED(p_user_data);
|
|
return EXIT_FAILURE;
|
|
}
|