Implemented a basic parser for the XP3 header.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/header.h b/src/header.h
new file mode 100644
index 0000000..7119f23
--- /dev/null
+++ b/src/header.h
@@ -0,0 +1,42 @@
+/* header.h -- Code for handling the archive's header section.
+
+   Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.
+
+   This file is part of Nekopack.
+
+   Nekopack is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation, either version 3 of the License, or (at
+   your option) any later version.
+
+   Nekopack 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Nekopack. If not, see <http://www.gnu.org/licenses/>. */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "io.h"
+
+#define XP3_MAGIC "XP3\x0d\x0a\x20\x0a\x1a\x8b\x67\x01"
+
+/* Structure representing the header section of an XP3 archive. */
+struct xp3_header {
+    char     magic[11]; /* Identifier for the archive. */
+    uint64_t info_offset; /* Offset to `table_size`. */
+    uint32_t version; /* Raw value containing the archive version. */
+    uint64_t table_size; /* The size of the table section. (?) */
+    uint8_t  flags; /* A flags variable for the archive. (?) */
+    uint64_t table_offset; /* Offset to the archive table. */
+};
+
+/* Reads data from the given stream into a newly allocated xp3_header
+   structure. The stream is assumed to be at the header's beginning.
+   NULL is returned if the header contains an invalid magic number, or
+   if the archive's version is not supported. */
+struct xp3_header *read_header(struct stream *s);