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/* This file is part of Nekopack.
Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.
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 <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "cli.h"
#define XP3_MAGIC "XP3\x0d\x0a\x20\x0a\x1a\x8b\x67\x01"
#define XP3_VERSION_1_TABLE_OFFSET 11
#define XP3_VERSION_OFFSET 19
#define EXIT_SUCCESS 0
#define EXIT_FAILURE 1
int is_xp3_archive(FILE *archive);
int get_archive_version(FILE *archive);
uint8_t table_is_compressed(FILE *archive, uint8_t table_offset);
uint64_t get_table_offset(FILE *archive, uint8_t archive_version);
int main(int argc, char *argv[]) {
struct configuration arguments = parse_args(argc, argv);
FILE *archive = fopen(argv[1], "rb");
if (!is_xp3_archive(archive)) {
fprintf(stderr, "File is not an XP3 archive.\n");
fclose(archive);
exit(EXIT_FAILURE);
}
/* After the table_is_compressed byte is 8 bytes containing the
compressed size followed by 8 bytes containing the original size
(if the archive is compressed). Use zlib's inflate function to
decompress the compressed size worth of chunks if it's compressed.
The decompressed data will contain a four-byte magic number,
followed by 8 bytes containing the file size, followed by the
file size worth of data.
See the following link for magic numbers and entry handling
procedures.
https://github.com/vn-tools/arc_unpacker/blob/master/src/dec
/kirikiri/xp3_archive_decoder.cc */
fclose(archive);
return 0;
}
/* Very simple check of the archive's magic number to decide
whether or not it really is a valid XP3 archive. */
int is_xp3_archive(FILE *archive) {
char magic_buffer[12] = {0};
rewind(archive);
fread(magic_buffer, sizeof(magic_buffer) - 1, 1, archive);
if (strcmp(magic_buffer, XP3_MAGIC))
return 0;
return 1;
}
/* Returns the version of XP3 used to pack the archive. */
int get_archive_version(FILE *archive) {
uint32_t version_word;
fseek(archive, XP3_VERSION_OFFSET, SEEK_SET);
fread(&version_word, sizeof(uint32_t), 1, archive);
return version_word == 1 ? 2 : 1;
}
/* Subroutine for finding the archive's table offset. If the
minor_version is invalid, the program will exit. */
uint64_t get_table_offset(FILE *archive, uint8_t archive_version) {
fseek(archive, XP3_VERSION_1_TABLE_OFFSET, SEEK_SET);
if (archive_version == 1) {
uint64_t table_offset;
fread(&table_offset, sizeof(uint64_t), 1, archive);
return table_offset;
}
uint64_t additional_header_offset, table_offset;
uint32_t minor_version;
fread(&additional_header_offset, sizeof(uint64_t), 1, archive);
fread(&minor_version, sizeof(uint32_t), 1, archive);
if (minor_version != 1) {
fprintf(stderr, "Version not implemented.\n");
exit(EXIT_FAILURE);
}
fseek(archive, additional_header_offset, SEEK_CUR);
fseek(archive, sizeof(uint8_t) + sizeof(uint64_t), SEEK_CUR);
fread(&table_offset, sizeof(uint64_t), 1, archive);
return table_offset;
}
/* Function that returns the byte representing
whether or not the archive was compressed. */
uint8_t table_is_compressed(FILE *archive, uint8_t table_offset) {
uint8_t is_compressed;
fseek(archive, table_offset, SEEK_SET);
fread(&is_compressed, sizeof(uint8_t), 1, archive);
return is_compressed;
}
void *inflate_table(FILE *archive, uint8_t table_offset) {
return 0x0;
}
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