1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libesg/representation/init_message.c b/lib/libesg/representation/init_message.c
new file mode 100644
index 0000000..0038607
--- /dev/null
+++ b/lib/libesg/representation/init_message.c
@@ -0,0 +1,112 @@
+/*
+ * 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);
+}