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4758 right-hear 1 
/*
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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) 2002-2003, Yannick Verschueren
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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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 * Read the information contains in VBAS [JPP/JPT stream message header]
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 * Store information (7 bits) in value
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 *
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 */
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unsigned int jpt_read_VBAS_info(opj_cio_t *cio, unsigned int value) {
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	unsigned char elmt;
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	elmt = cio_read(cio, 1);
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	while ((elmt >> 7) == 1) {
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		value = (value << 7);
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		value |= (elmt & 0x7f);
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		elmt = cio_read(cio, 1);
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	}
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	value = (value << 7);
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	value |= (elmt & 0x7f);
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	return value;
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}
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/*
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 * Initialize the value of the message header structure
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 *
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 */
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void jpt_init_msg_header(opj_jpt_msg_header_t * header) {
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	header->Id = 0;		/* In-class Identifier    */
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	header->last_byte = 0;	/* Last byte information  */
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	header->Class_Id = 0;		/* Class Identifier       */
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	header->CSn_Id = 0;		/* CSn : index identifier */
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	header->Msg_offset = 0;	/* Message offset         */
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	header->Msg_length = 0;	/* Message length         */
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	header->Layer_nb = 0;		/* Auxiliary for JPP case */
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}
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/*
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 * Re-initialize the value of the message header structure
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 *
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 * Only parameters always present in message header
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 *
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 */
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void jpt_reinit_msg_header(opj_jpt_msg_header_t * header) {
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	header->Id = 0;		/* In-class Identifier    */
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	header->last_byte = 0;	/* Last byte information  */
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	header->Msg_offset = 0;	/* Message offset         */
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	header->Msg_length = 0;	/* Message length         */
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}
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/*
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 * Read the message header for a JPP/JPT - stream
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 *
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 */
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void jpt_read_msg_header(opj_common_ptr cinfo, opj_cio_t *cio, opj_jpt_msg_header_t *header) {
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	unsigned char elmt, Class = 0, CSn = 0;
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	jpt_reinit_msg_header(header);
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	/* ------------- */
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	/* VBAS : Bin-ID */
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	/* ------------- */
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	elmt = cio_read(cio, 1);
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	/* See for Class and CSn */
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	switch ((elmt >> 5) & 0x03) {
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		case 0:
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			opj_event_msg(cinfo, EVT_ERROR, "Forbidden value encounter in message header !!\n");
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			break;
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		case 1:
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			Class = 0;
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			CSn = 0;
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			break;
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		case 2:
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			Class = 1;
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			CSn = 0;
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			break;
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		case 3:
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			Class = 1;
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			CSn = 1;
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			break;
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		default:
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			break;
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	}
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	/* see information on bits 'c' [p 10 : A.2.1 general, ISO/IEC FCD 15444-9] */
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	if (((elmt >> 4) & 0x01) == 1)
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		header->last_byte = 1;
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	/* In-class identifier */
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	header->Id |= (elmt & 0x0f);
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	if ((elmt >> 7) == 1)
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		header->Id = jpt_read_VBAS_info(cio, header->Id);
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	/* ------------ */
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	/* VBAS : Class */
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	/* ------------ */
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	if (Class == 1) {
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		header->Class_Id = 0;
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		header->Class_Id = jpt_read_VBAS_info(cio, header->Class_Id);
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	}
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	/* ---------- */
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	/* VBAS : CSn */
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	/* ---------- */
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	if (CSn == 1) {
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		header->CSn_Id = 0;
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		header->CSn_Id = jpt_read_VBAS_info(cio, header->CSn_Id);
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	}
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	/* ----------------- */
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	/* VBAS : Msg_offset */
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	/* ----------------- */
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	header->Msg_offset = jpt_read_VBAS_info(cio, header->Msg_offset);
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	/* ----------------- */
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	/* VBAS : Msg_length */
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	/* ----------------- */
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	header->Msg_length = jpt_read_VBAS_info(cio, header->Msg_length);
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	/* ---------- */
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	/* VBAS : Aux */
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	/* ---------- */
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	if ((header->Class_Id & 0x01) == 1) {
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		header->Layer_nb = 0;
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		header->Layer_nb = jpt_read_VBAS_info(cio, header->Layer_nb);
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	}
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}