829 lines
25 KiB
C
829 lines
25 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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* Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
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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 "cio.h"
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#include "opj_includes.h"
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#include "opj_malloc.h"
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#include "event.h"
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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
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(i=0;i<p_nb_bytes;++i)
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{
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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
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(i=0;i<p_nb_bytes;++i)
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{
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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
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(i=0;i<sizeof(OPJ_FLOAT64);++i)
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{
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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
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(i=0;i<sizeof(OPJ_FLOAT64);++i)
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{
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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
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(i=0;i<sizeof(OPJ_FLOAT32);++i)
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{
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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
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(i=0;i<sizeof(OPJ_FLOAT32);++i)
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{
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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_UINT32 p_size,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
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(! l_stream)
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{
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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_size;
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l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_size);
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if
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(! l_stream->m_stored_data)
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{
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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
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(l_is_input)
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{
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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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{
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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(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
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(l_stream)
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{
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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
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((!l_stream) || (! (l_stream->m_status & opj_stream_e_input)))
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{
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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;
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}
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/**
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* Sets the given function to be used as a write function.
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* @param p_stream the stream to modify
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* @param p_function the function to use a write function.
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*/
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OPJ_API void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_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 )|| (! (l_stream->m_status & opj_stream_e_output)))
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{
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return;
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}
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l_stream->m_write_fn = p_function;
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}
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/**
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* Sets the given function to be used as a skip function.
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* @param p_stream the stream to modify
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* @param p_function the function to use a skip function.
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*/
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OPJ_API void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_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_skip_fn = p_function;
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}
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/**
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* Sets the given data to be used as a user data for the stream.
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* @param p_stream the stream to modify
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* @param p_data the data to set.
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*/
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OPJ_API void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data)
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{
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opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
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l_stream->m_user_data = p_data;
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}
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/**
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* Reads some bytes from the stream.
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* @param p_stream the stream to read data from.
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* @param p_buffer pointer to the data buffer that will receive the data.
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* @param p_size number of bytes to read.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes read, or -1 if an error occured or if the stream is at the end.
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*/
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OPJ_UINT32 opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_UINT32 p_size, opj_event_mgr_t * p_event_mgr)
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{
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OPJ_UINT32 l_read_nb_bytes = 0;
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if
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(p_stream->m_bytes_in_buffer >= p_size)
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{
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memcpy(p_buffer,p_stream->m_current_data,p_size);
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p_stream->m_current_data += p_size;
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p_stream->m_bytes_in_buffer -= p_size;
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l_read_nb_bytes += p_size;
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p_stream->m_byte_offset += p_size;
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return l_read_nb_bytes;
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}
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// we are now in the case when the remaining data if not sufficient
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if
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(p_stream->m_status & opj_stream_e_end)
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{
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l_read_nb_bytes += p_stream->m_bytes_in_buffer;
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memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
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p_stream->m_current_data += p_stream->m_bytes_in_buffer;
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p_stream->m_byte_offset += p_stream->m_bytes_in_buffer;
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p_stream->m_bytes_in_buffer = 0;
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return l_read_nb_bytes ? l_read_nb_bytes : -1;
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}
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// the flag is not set, we copy data and then do an actual read on the stream
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if
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(p_stream->m_bytes_in_buffer)
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{
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l_read_nb_bytes += p_stream->m_bytes_in_buffer;
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memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
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p_stream->m_current_data = p_stream->m_stored_data;
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p_buffer += p_stream->m_bytes_in_buffer;
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p_size -= p_stream->m_bytes_in_buffer;
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p_stream->m_byte_offset += p_stream->m_bytes_in_buffer;
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p_stream->m_bytes_in_buffer = 0;
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}
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else
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{
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/* case where we are already at the end of the buffer
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so reset the m_current_data to point to the start of the
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stored buffer to get ready to read from disk*/
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p_stream->m_current_data = p_stream->m_stored_data;
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}
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|
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while
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(true)
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{
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// we should read less than a chunk -> read a chunk
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if
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(p_size < p_stream->m_buffer_size)
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{
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// we should do an actual read on the media
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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);
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if
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(p_stream->m_bytes_in_buffer == -1)
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{
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// end of stream
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opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
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p_stream->m_bytes_in_buffer = 0;
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p_stream->m_status |= opj_stream_e_end;
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// end of stream
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return l_read_nb_bytes ? l_read_nb_bytes : -1;
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}
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else if
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(p_stream->m_bytes_in_buffer < p_size)
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{
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// 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 += 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 += 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 == -1)
|
|
{
|
|
// end of stream
|
|
opj_event_msg(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 : -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 += 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 += 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_UINT32 opj_stream_write_data (opj_stream_private_t * p_stream,const OPJ_BYTE * p_buffer,OPJ_UINT32 p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_UINT32 l_remaining_bytes = 0;
|
|
OPJ_UINT32 l_write_nb_bytes = 0;
|
|
|
|
if
|
|
(p_stream->m_status & opj_stream_e_error)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
while
|
|
(true)
|
|
{
|
|
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 += 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 += l_remaining_bytes;
|
|
}
|
|
if
|
|
(! opj_stream_flush(p_stream, p_event_mgr))
|
|
{
|
|
return -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.
|
|
*/
|
|
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_UINT32 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 == -1)
|
|
{
|
|
p_stream->m_status |= opj_stream_e_error;
|
|
opj_event_msg(p_event_mgr, EVT_INFO, "Error on writting stream!\n");
|
|
return false;
|
|
}
|
|
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 true;
|
|
}
|
|
|
|
/**
|
|
* 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_SIZE_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
OPJ_SIZE_T l_skip_nb_bytes = 0;
|
|
OPJ_SIZE_T l_current_skip_nb_bytes = 0;
|
|
|
|
if
|
|
(p_stream->m_bytes_in_buffer >= p_size)
|
|
{
|
|
p_stream->m_current_data += p_size;
|
|
p_stream->m_bytes_in_buffer -= 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 += 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_SIZE_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 += p_stream->m_bytes_in_buffer;
|
|
p_stream->m_current_data = p_stream->m_stored_data;
|
|
p_size -= 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_SIZE_T) -1)
|
|
{
|
|
opj_event_msg(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_SIZE_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_SIZE_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
bool l_is_written = 0;
|
|
OPJ_SIZE_T l_current_skip_nb_bytes = 0;
|
|
OPJ_SIZE_T l_skip_nb_bytes = 0;
|
|
|
|
if
|
|
(p_stream->m_status & opj_stream_e_error)
|
|
{
|
|
return (OPJ_SIZE_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_SIZE_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_SIZE_T)-1)
|
|
{
|
|
opj_event_msg(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_SIZE_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 o fthe stream.
|
|
*/
|
|
OPJ_SIZE_T opj_stream_tell (const opj_stream_private_t * p_stream)
|
|
{
|
|
return p_stream->m_byte_offset;
|
|
}
|
|
|
|
/**
|
|
* 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_SIZE_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
|
|
{
|
|
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.
|
|
*/
|
|
bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, opj_event_mgr_t * 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 false;
|
|
}
|
|
else
|
|
{
|
|
// reset stream status
|
|
p_stream->m_status &= (~opj_stream_e_end);
|
|
p_stream->m_byte_offset = p_size;
|
|
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_SIZE_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 false;
|
|
}
|
|
|
|
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 false;
|
|
}
|
|
else
|
|
{
|
|
p_stream->m_byte_offset = p_size;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr)
|
|
{
|
|
return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
|
|
}
|
|
|
|
/**
|
|
* Tells if the given stream is seekable.
|
|
*/
|
|
bool opj_stream_has_seek (const opj_stream_private_t * p_stream)
|
|
{
|
|
return p_stream->m_seek_fn != opj_stream_default_seek;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
OPJ_UINT32 opj_stream_default_read (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data)
|
|
{
|
|
return (OPJ_UINT32) -1;
|
|
}
|
|
OPJ_UINT32 opj_stream_default_write (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data)
|
|
{
|
|
return (OPJ_UINT32) -1;
|
|
}
|
|
OPJ_SIZE_T opj_stream_default_skip (OPJ_SIZE_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
return (OPJ_SIZE_T) -1;
|
|
}
|
|
|
|
bool opj_stream_default_seek (OPJ_SIZE_T p_nb_bytes, void * p_user_data)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
|
|
|