From 1fc6cc323dbaa5387d84630615c0d4cab0c1c5ba Mon Sep 17 00:00:00 2001 From: jakob Date: Tue, 14 Feb 2017 18:47:57 -0500 Subject: Implemented a basic parser for the XP3 header. --- src/header.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/header.c (limited to 'src/header.c') diff --git a/src/header.c b/src/header.c new file mode 100644 index 0000000..e039447 --- /dev/null +++ b/src/header.c @@ -0,0 +1,53 @@ +/* header.c -- 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 . */ + +#include +#include +#include + +#include "header.h" +#include "io.h" + +static bool is_xp3(struct xp3_header *h); +static bool is_supported(struct xp3_header *h); + + +/* 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) { + struct xp3_header *h = malloc(sizeof(struct xp3_header)); + if (h == NULL) return NULL; + stream_read(h, s, sizeof(struct xp3_header)); + if (!is_xp3(h) || !is_supported(h)) {free(h); return NULL;} + return h; +} + + +/* Checks that the header contains the correct magic number. */ +static bool is_xp3(struct xp3_header *h) { + return !memcmp(h->magic, XP3_MAGIC, 11); +} + + +/* Checks that the archive is of XP3 version 2. */ +static bool is_supported(struct xp3_header *h) { + return h->version == 1; +} -- cgit v1.3