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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <mxml.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/stat.h>
#include <string.h>
//First 5 bytes is MD5 hash of "NaturalPoint"
static uint8_t secret_key[] = {0x0e, 0x9a, 0x63, 0x71, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
static uint8_t S[256] = {0};
static char *decoded = NULL;
static mxml_node_t *xml = NULL;
static mxml_node_t *tree = NULL;
static void ksa(uint8_t key[], size_t len)
{
unsigned int i, j;
for(i = 0; i < 256; ++i){
S[i] = i;
}
j = 0;
for(i = 0; i < 256; ++i){
j = (j + S[i] + key[i % len]) % 256;
uint8_t tmp = S[i];
S[i] = S[j];
S[j] = tmp;
}
}
static uint8_t rc4()
{
static uint8_t i = 0;
static uint8_t j = 0;
i += 1;
j += S[i];
uint8_t tmp = S[i];
S[i] = S[j];
S[j] = tmp;
return S[(S[i] + S[j]) % 256];
}
static bool decrypt_file(const char *fname, bool from_update)
{
uint32_t header[5];
size_t datlen;
ksa(secret_key, 16);
FILE *inp;
struct stat fst;
if((inp = fopen(fname, "rb")) == NULL){
printf("Can't open input file '%s'", fname);
return false;
}
if(fstat(fileno(inp), &fst) != 0){
fclose(inp);
printf("Cannot stat file '%s'\n", fname);
return false;
}
if(from_update){
if(fread(&header, sizeof(uint32_t), 5, inp) != 5){
fclose(inp);
printf("Can't read the header - file '%s' is less than 20 bytes long?\n", fname);
return false;
}
datlen = header[4];
}else{
datlen = fst.st_size;
}
if((decoded = (char *)malloc(datlen+1)) == NULL){
printf("malloc failed!\n");
return false;
}
memset(decoded, 0, datlen+1);
size_t i;
size_t len = fread(decoded, 1, datlen, inp);
(void) len;
for(i = 0; i < datlen; ++i) decoded[i] ^= rc4();
fclose(inp);
//inp = fopen("tmp.dump", "w");
//fwrite(decoded, 1, datlen, inp);
//fclose(inp);
return true;
}
static bool game_data_init(const char *fname, bool from_update)
{
static bool initialized = false;
if(initialized){
return true;
}
if(!decrypt_file(fname, from_update)){
printf("Error decrypting file!\n");
return false;
}
xml = mxmlNewXML("1.0");
tree = mxmlLoadString(xml, decoded, MXML_TEXT_CALLBACK);
return (tree != NULL);
}
static void game_data_close()
{
mxmlDelete(tree);
free(decoded);
}
#define ltr_int_log_message(...) fprintf(stderr, __VA_ARGS__)
bool get_game_data(const char *input_fname, const char *output_fname, bool from_update)
{
FILE *outfile = NULL;
if((outfile = (output_fname ? fopen(output_fname, "w") : stdout)) == NULL){
ltr_int_log_message("Can't open the output file '%s'!\n", output_fname);
return false;
}
if(!game_data_init(input_fname, from_update)){
ltr_int_log_message("Can't process the data file '%s'!\n", input_fname);
return false;
}
mxml_node_t *game;
const char *name;
const char *id;
for(game = mxmlFindElement(tree, tree, "Game", NULL, NULL, MXML_DESCEND);
game != NULL;
game = mxmlFindElement(game, tree, "Game", NULL, NULL, MXML_DESCEND)){
name = mxmlElementGetAttr(game, "Name");
id = mxmlElementGetAttr(game, "Id");
mxml_node_t *appid = mxmlFindElement(game, game, "ApplicationID", NULL, NULL, MXML_DESCEND);
if(appid == NULL){
fprintf(outfile, "%s \"%s\"\n", id, name);
}else{
fprintf(outfile, "%s \"%s\" (%s)\n", id, name, appid->child->value.text.string);
}
}
fclose(outfile);
game_data_close();
return true;
}
int main(int argc, char** argv) { return argc > 1 && get_game_data(argv[1], NULL, false); }
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