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/* header.c -- Code for handling the archive's header section.
Copyright (C) 2017 Jakob Kreuze, 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/>. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "header.h"
#include "io.h"
/* Checks that the header contains the correct magic number. */
static bool is_xp3(struct header *h) {
return !memcmp(h->magic, XP3_MAGIC, 11);
}
/* Checks that the archive's version is supported, and that it is marked
as compatible with the KiriKiriZ engine. */
static bool is_supported(struct header *h) {
return h->version == 1 && h->flags & 0x80;
}
/* Reads from the given stream into a newly allocated header structure.
NULL is returned if the header contains an invalid magic number, or
if the archive's version is not supported. */
struct header *read_header(struct stream *s) {
struct header *h = malloc(sizeof(struct header));
if (h == NULL) return NULL;
/* The header structure can't be read into directly because of
alignment issues. */
stream_read(h->magic, s, 11);
stream_read(&h->info_offset, s, sizeof(uint64_t));
stream_read(&h->version, s, sizeof(uint32_t));
stream_read(&h->flags, s, sizeof(uint8_t));
stream_read(&h->table_size, s, sizeof(uint64_t));
stream_read(&h->table_offset, s, sizeof(uint64_t));
if (!is_xp3(h) || !is_supported(h)) {
free(h);
return NULL;
}
return h;
}
/* Generates an XP3 header structure readable by Nekopara. */
struct header *create_header(void) {
struct header *h = malloc(sizeof(struct header));
if (h == NULL)
return NULL;
memcpy(h->magic, XP3_MAGIC, 11);
h->info_offset = 0x17;
h->version = 1;
h->flags = 0x80;
h->table_size = 0;
h->table_offset = 0;
return h;
}
/* Dumps the XP3 header specified by `h` into `fp`. */
void dump_header(FILE *fp, struct header *h) {
fwrite(h->magic, 11, 1, fp);
fwrite(&h->info_offset, sizeof(uint64_t), 1, fp);
fwrite(&h->version, sizeof(uint32_t), 1, fp);
fwrite(&h->flags, sizeof(uint8_t), 1, fp);
fwrite(&h->table_size, sizeof(uint64_t), 1, fp);
fwrite(&h->table_offset, sizeof(uint64_t), 1, fp);
}
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