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/* main.c -- Entry point to the program.
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/>. */
#include <sys/stat.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cli.h"
#include "compress.h"
#include "crypto.h"
#include "header.h"
#include "io.h"
#include "table.h"
#define VERSION_STR "2.0.0b1"
/* Pointer to a function to be mapped to entries in the table. */
typedef void (*mapfn)(struct stream *archive, struct table_entry *e,
struct params p);
/* Writes usage information to stderr. */
static void print_usage(char *prog_name) {
fprintf(stderr, "Usage: %s [OPTIONS] (ARCHIVES) [PATHS]\n", prog_name);
}
/* Writes versioning information to stdout. */
static void print_version(void) {
printf("Nekopack version %s\nProgrammed by Jakob. "
"<http://jakob.space>\n", VERSION_STR);
}
/* Writes help information to stdout. */
static void print_help(void) {
printf("A tool for decompressing the XP3 archives used by Nekopara.\n\n"
" -h, --help\t\tDisplay this help page and exit.\n"
" -v, --version\tDisplay the currently installed version and "
"exit.\n\n"
" -e, --extract\tExtract the contents of the archive. This is "
"the default.\n"
" -l, --list\t\tList the contents of the archive.\n\n"
" -o, --output\t\tPath to extract files to.\n"
" -g, --game\t\tGame the archive is from. Required for file "
"decryption\n"
" -q, --quiet\t\tDon't display information about extracted "
"files.\n\n"
"Supported games: nekopara_volume_0, nekopara_volume_0_steam,\n"
"nekopara_volume_1, nekopara_volume_1_steam\n");
}
/* Inflates the table according to information in the header. */
static struct stream *load_table(struct stream *s) {
uint8_t compressed;
uint64_t len, decompressed_len;
stream_read(&compressed, s, sizeof(uint8_t));
stream_read(&len, s, sizeof(uint64_t));
stream_read(&decompressed_len, s, sizeof(uint64_t));
if (compressed)
return stream_inflate(s, len, decompressed_len);
return stream_clone(s, len);
}
/* Creates any directories that do not already exist in `path`. */
void make_dirs(char *path) {
struct stat tmp = {0};
char *buf = calloc(0x100, 1);
char *buf_start = buf;
for (int i = 0; i < 0x100 && path[i] != '\0'; i++) {
if (path[i] == '/') {
*buf++ = '/';
*buf = '\0';
if (stat(buf_start, &tmp) == -1)
mkdir(buf_start, 0777);
} else {
*buf++ = path[i];
}
}
free(buf_start);
}
/* Concatenates `name` and the output path specified in `p`. */
static char *get_path(struct params p, char *name) {
size_t name_len = strlen(name);
char *path = malloc(p.out_len + name_len + 2);
strcpy(path, p.out);
strcpy(path + p.out_len + 1, name);
return path;
}
/* Basic mapfn for printing the filename of each entry. */
static void list(struct stream *s, struct table_entry *e, struct params p) {
printf("%s\n", e->filename);
}
/* Mapfn for extracting the contents of the archive. */
static void extract(struct stream *s, struct table_entry *e, struct params p) {
char *path = get_path(p, e->filename);
make_dirs(path);
FILE *fp = fopen(path, "wb+");
struct stream *segm_data;
struct segment *segm;
for (uint64_t i = 0; i < e->segment_count; i++) {
segm = e->segments[i];
stream_seek(s, segm->offset, SEEK_SET);
if (e->segments[i]->compressed) {
segm_data = stream_inflate(s, segm->compressed_size,
segm->decompressed_size);
} else {
segm_data = stream_clone(s, segm->compressed_size);
}
struct game_key k = get_key(NEKOPARA_VOLUME_1);
uint8_t initial = derive_initial(k, e->key);
uint8_t primary = derive_primary(k, e->key);
stream_xor(segm_data, initial, primary);
stream_dump(fp, segm_data, segm_data->len);
stream_free(segm_data);
}
fclose(fp);
free(path);
}
/* Maps `fn` to every table entry found in the archive at `path`. */
static void map_entries(char *path, struct params p, mapfn fn) {
struct stream *archive = stream_from_file(path);
struct header *h = read_header(archive);
stream_seek(archive, h->table_offset, SEEK_SET);
struct stream *table = load_table(archive);
struct table_entry *root = read_table(table);
for (struct table_entry *cur = root->next; cur != NULL; cur = cur->next)
fn(archive, cur, p);
entry_free(root);
stream_free(table);
free(h);
stream_free(archive);
}
int main(int argc, char **argv) {
struct params p = parse_args(argc, argv);
switch (p.mode) {
case USAGE:
print_usage(argv[0]);
return 1;
case VERSION:
print_version();
break;
case HELP:
print_help();
break;
case LIST:
for (int i = p.vararg_index; i < argc; i++)
map_entries(argv[i], p, list);
break;
case EXTRACT:
for (int i = p.vararg_index; i < argc; i++)
map_entries(argv[i], p, extract);
}
params_free(p);
return 0;
}
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