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/*
* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
* Copyright (c) 2002-2007, Professor Benoit Macq
* Copyright (c) 2002-2003, Yannick Verschueren
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "jpt.h"
#include "openjpeg.h"
#include "cio.h"
#include "event.h"
/*
* Read the information contains in VBAS [JPP/JPT stream message header]
* Store information (7 bits) in value
* @param p_cio the stream to read from.
* @param p_value the data to update
* @return the nb of bytes read or -1 if an io error occurred.
*/
bool jpt_read_VBAS_info(opj_stream_private_t * p_cio, OPJ_UINT32 * p_nb_bytes_read, OPJ_UINT32 * p_value, opj_event_mgr_t * p_manager)
{
OPJ_BYTE l_elmt;
OPJ_UINT32 l_nb_bytes_read = 0;
// read data till the MSB of the current byte is 1.
// concatenate 7 bits of data, last bit is finish flag
// read data from the stream
if
(opj_stream_read_data(p_cio,&l_elmt,1,p_manager) != 1)
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data.\n");
return false;
}
++l_nb_bytes_read;
// is the MSB equal to 1 ?
while
(l_elmt & 0x80)
{
// concatenate 7 bits of data, last bit is finish flag
*p_value = (*p_value << 7) | (l_elmt & 0x7f);
if
(opj_stream_read_data(p_cio,&l_elmt,1,p_manager) != 1)
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data.\n");
return false;
}
++l_nb_bytes_read;
}
// concatenate 7 bits of data, last bit is finish flag
*p_value = (*p_value << 7) | (l_elmt & 0x7f);
* p_nb_bytes_read = l_nb_bytes_read;
return true;
}
/*
* Initialize the value of the message header structure
*
*/
void jpt_init_msg_header(opj_jpt_msg_header_t * header)
{
header->Id = 0; /* In-class Identifier */
header->last_byte = 0; /* Last byte information */
header->Class_Id = 0; /* Class Identifier */
header->CSn_Id = 0; /* CSn : index identifier */
header->Msg_offset = 0; /* Message offset */
header->Msg_length = 0; /* Message length */
header->Layer_nb = 0; /* Auxiliary for JPP case */
}
/*
* Re-initialize the value of the message header structure
*
* Only parameters always present in message header
*
*/
void jpt_reinit_msg_header(opj_jpt_msg_header_t * header)
{
header->Id = 0; /* In-class Identifier */
header->last_byte = 0; /* Last byte information */
header->Msg_offset = 0; /* Message offset */
header->Msg_length = 0; /* Message length */
}
/*
* Read the message header for a JPP/JPT - stream
*
*/
bool jpt_read_msg_header(opj_stream_private_t *cio, opj_jpt_msg_header_t *header, OPJ_UINT32 * p_nb_bytes_read, opj_event_mgr_t * p_manager)
{
OPJ_BYTE elmt, Class = 0, CSn = 0;
OPJ_UINT32 l_nb_bytes_read = 0;
OPJ_UINT32 l_last_nb_bytes_read;
jpt_reinit_msg_header(header);
/* ------------- */
/* VBAS : Bin-ID */
/* ------------- */
if
(opj_stream_read_data(cio,&elmt,1,p_manager) != 1)
{
opj_event_msg(p_manager, EVT_ERROR, "Forbidden value encounter in message header !!\n");
return false;
}
++l_nb_bytes_read;
/* See for Class and CSn */
switch ((elmt >> 5) & 0x03)
{
case 0:
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
break;
case 1:
Class = 0;
CSn = 0;
break;
case 2:
Class = 1;
CSn = 0;
break;
case 3:
Class = 1;
CSn = 1;
break;
default:
break;
}
/* see information on bits 'c' [p 10 : A.2.1 general, ISO/IEC FCD 15444-9] */
if
(((elmt >> 4) & 0x01) == 1)
{
header->last_byte = 1;
}
/* In-class identifier */
header->Id |= (elmt & 0x0f);
if
((elmt >> 7) == 1)
{
l_last_nb_bytes_read = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->Id), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
}
/* ------------ */
/* VBAS : Class */
/* ------------ */
if (Class == 1)
{
header->Class_Id = 0;
l_last_nb_bytes_read = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->Class_Id), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
}
/* ---------- */
/* VBAS : CSn */
/* ---------- */
if (CSn == 1)
{
header->CSn_Id = 0;
l_last_nb_bytes_read = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->CSn_Id), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
}
/* ----------------- */
/* VBAS : Msg_offset */
/* ----------------- */
l_last_nb_bytes_read = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->Msg_offset), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
/* ----------------- */
/* VBAS : Msg_length */
/* ----------------- */
l_last_nb_bytes_read = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->Msg_length), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
/* ---------- */
/* VBAS : Aux */
/* ---------- */
if ((header->Class_Id & 0x01) == 1)
{
header->Layer_nb = 0;
if
(! jpt_read_VBAS_info(cio, &l_last_nb_bytes_read, &(header->Layer_nb), p_manager))
{
opj_event_msg(p_manager, EVT_ERROR, "Error trying to read a byte of data!!!\n");
return false;
}
l_nb_bytes_read += l_last_nb_bytes_read;
}
* p_nb_bytes_read = l_nb_bytes_read;
return true;
}
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