164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/*
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* Copyright (c) 2004, Yannick Verschueren
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* Copyright (c) 2004, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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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 <stdio.h>
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#include <stdlib.h>
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#include "jpt.h"
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#include "j2k.h"
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#include "cio.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(unsigned int value)
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{
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unsigned char elmt;
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elmt = cio_read(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(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(jpt_msg_header_struct_t * header)
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{
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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(jpt_msg_header_struct_t * header)
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{
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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(jpt_msg_header_struct_t * header)
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{
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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(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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fprintf(stderr, "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 >> 3) & 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(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(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(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(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(header->Msg_length);
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/* ---------- */
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/* VBAS : Aux */
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/* ---------- */
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if (header->CSn_Id == 1) {
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header->Layer_nb = 0;
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header->Layer_nb = jpt_read_VBAS_info(header->Layer_nb);
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}
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}
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