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/*
* ESG parser
*
* Copyright (C) 2006 Stephane Este-Gracias (sestegra@free.fr)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
#include <string.h>
#include <libesg/representation/init_message.h>
#include <libesg/representation/textual_decoder_init.h>
#include <libesg/representation/bim_decoder_init.h>
struct esg_init_message *esg_init_message_decode(uint8_t *buffer, uint32_t size) {
uint32_t pos;
struct esg_init_message *init_message;
if ((buffer == NULL) || (size <= 3)) {
return NULL;
}
pos = 0;
init_message = (struct esg_init_message *) malloc(sizeof(struct esg_init_message));
memset(init_message, 0, sizeof(struct esg_init_message));
init_message->encoding_version = buffer[pos];
pos += 1;
init_message->indexing_flag = (buffer[pos] & 0x80) >> 7;
pos += 1;
init_message->decoder_init_ptr = buffer[pos];
pos += 1;
if (init_message->indexing_flag) {
init_message->indexing_version = buffer[pos];
pos += 1;
}
switch (init_message->encoding_version) {
case 0xF1: {
struct esg_bim_encoding_parameters *encoding_parameters = (struct esg_bim_encoding_parameters *) malloc(sizeof(struct esg_bim_encoding_parameters));
memset(encoding_parameters, 0, sizeof(struct esg_bim_encoding_parameters));
init_message->encoding_parameters = (void *) encoding_parameters;
encoding_parameters->buffer_size_flag = (buffer[pos] & 0x80) >> 7;
encoding_parameters->position_code_flag = (buffer[pos] & 0x40) >> 6;
pos += 1;
encoding_parameters->character_encoding = buffer[pos];
pos += 1;
if (encoding_parameters->buffer_size_flag) {
encoding_parameters->buffer_size = (buffer[pos] << 16) | (buffer[pos+1] << 8) | buffer[pos+2];
pos += 3;
}
// TODO
// init_message->decoder_init = (void *) esg_bim_decoder_init_decode(buffer + init_message->decoder_init_ptr, size - init_message->decoder_init_ptr);
break;
}
case 0xF2:
case 0xF3: {
struct esg_textual_encoding_parameters *encoding_parameters = (struct esg_textual_encoding_parameters *) malloc(sizeof(struct esg_textual_encoding_parameters));
memset(encoding_parameters, 0, sizeof(struct esg_textual_encoding_parameters));
init_message->encoding_parameters = (void *) encoding_parameters;
encoding_parameters->character_encoding = buffer[pos];
pos += 1;
init_message->decoder_init = (void *) esg_textual_decoder_init_decode(buffer + init_message->decoder_init_ptr, size - init_message->decoder_init_ptr);
break;
}
default: {
esg_init_message_free(init_message);
return NULL;
}
}
return init_message;
}
void esg_init_message_free(struct esg_init_message *init_message) {
if (init_message == NULL) {
return;
}
if (init_message->encoding_parameters) {
free(init_message->encoding_parameters);
}
if (init_message->decoder_init) {
free(init_message->decoder_init);
}
free(init_message);
}
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