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/*
* MSGENC: Encodes a Pokemon DP message file to binary
*
* Usage:
* msgenc DIR CHARMAP
*/
#include <iostream>
#include <string>
#include <sstream>
#include <fstream>
#include <map>
#include <vector>
#include <algorithm>
#if (__GNUC__ <= 7) && !defined _MSC_VER
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
#else
#include <filesystem>
namespace fs = std::filesystem;
#endif
struct MsgArcHeader
{
uint16_t count;
uint16_t key;
};
struct MsgAlloc
{
uint32_t offset;
uint32_t length;
};
using namespace std;
using namespace fs;
u16string ReadTextFileU16LE(path filename) {
FILE * file = fopen(filename.c_str(), "rb");
if (file == NULL) {
stringstream ss;
ss << "unable to open " << filename << " for reading";
throw runtime_error(ss.str());
}
wchar_t bom;
if (fread(&bom, 2, 1, file) != 1) {
stringstream ss;
ss << "read error in " << filename;
throw runtime_error(ss.str());
}
if (bom != 0xFEFF) {
stringstream ss;
ss << "invalid bom in " << filename;
throw runtime_error(ss.str());
}
fseek(file, 0, SEEK_END);
size_t count = ftell(file) / 2 - 1;
fseek(file, 2, SEEK_SET);
auto buf = new char16_t[count + 1];
if (fread(buf, 2, count, file) != count) {
stringstream ss;
ss << "read error in " << filename;
throw runtime_error(ss.str());
}
buf[count] = L'\0';
fclose(file);
return buf;
}
static map<u16string, uint16_t> charmap;
uint16_t u16rstoi(u16string s, int base = 10) {
int pow = 1;
int nybble;
uint16_t value_i = 0;
if (base != 10 && base != 16) {
stringstream ss;
ss << "Unrecognized numeric base: " << base;
throw runtime_error(ss.str());
}
reverse(s.begin(), s.end());
for (auto c : s) {
switch (c) {
case u'0' ... u'9':
nybble = c - u'0';
break;
case u'A' ... u'F':
if (base == 10)
return value_i;
nybble = c - u'A' + 10;
break;
case u'a' ... u'f':
if (base == 10)
return value_i;
nybble = c - u'a' + 10;
break;
default:
return value_i;
}
value_i += nybble * pow;
pow *= base;
}
return value_i;
}
void read_charmap(path filename) {
u16string raw = ReadTextFileU16LE(filename);
size_t pos, eqpos, last_pos = 0;
while (last_pos != u16string::npos && (pos = raw.find_first_of(u"\r\n", last_pos)) != u16string::npos) {
eqpos = raw.find(u'=', last_pos);
if (eqpos == u16string::npos)
{
stringstream s;
s << "charmap syntax error at " << (charmap.size() + 1);
throw(runtime_error(s.str()));
}
u16string value = raw.substr(last_pos, eqpos - last_pos);
u16string code = raw.substr(eqpos + 1, pos - eqpos - 1);
uint16_t value_i = u16rstoi(value, 16);
charmap[code] = value_i;
last_pos = raw.find_last_of(u"\r\n", pos + 1, 2) + 1;
}
}
static MsgArcHeader header;
vector<MsgAlloc> alloc_table;
static vector<u16string> files;
static vector<u16string> outfiles;
void read_key(path keyfname) {
fstream keyfile(keyfname, ios_base::in | ios_base::binary);
keyfile.read((char *)&header.key, 2);
}
void read_msgs(path fname) {
u16string text = ReadTextFileU16LE(fname);
size_t pos = 0;
do {
text = text.substr(pos);
if (text.empty())
break;
pos = text.find_first_of(u"\r\n");
files.push_back(text.substr(0, pos));
pos = text.find_last_of(u"\r\n", pos + 1, 2);
if (pos == u16string::npos)
break;
pos++;
} while (pos != u16string::npos);
header.count = files.size();
}
uint16_t enc_short(uint16_t value, uint16_t & seed) {
value ^= seed;
seed += 18749;
return value;
}
void encode_messages() {
int i = 1;
for (auto message : files) {
u16string encoded;
uint16_t seed = i * 596947;
for (size_t j = 0; j < message.size(); j++) {
if (message[j] == u'{') {
size_t k = message.find(u'}', j);
u16string enclosed = message.substr(j + 1, k - j - 1);
j = k;
if (enclosed.find(u"STRVAR ") == 0) {
enclosed = enclosed.substr(7);
encoded += enc_short(0xFFFE, seed);
do {
k = enclosed.find(u',');
u16string num = enclosed.substr(0, k);
uint16_t num_i = u16rstoi(num);
encoded += enc_short(num_i, seed);
enclosed = enclosed.substr(k + 1);
} while (k++ != u16string::npos);
} else {
encoded += enc_short(u16rstoi(enclosed, 16), seed);
}
} else {
uint16_t code = 0;
size_t k;
u16string substr;
for (k = 0; k < message.size() - j; k++) {
substr = message.substr(j, k + 1);
code = charmap[substr];
if (code != 0 || substr == u"\\x0000")
break;
}
if (code == 0 && substr != u"\\x0000") {
stringstream ss;
ss << "unrecognized character: file " << i << " pos " << (j + 1);
throw runtime_error(ss.str());
}
encoded += enc_short(code, seed);
j += k;
}
}
encoded += enc_short(0xFFFF, seed);
MsgAlloc alloc {0, 0};
if (i > 1) {
alloc.offset = alloc_table[i - 2].offset + alloc_table[i - 2].length * 2;
} else {
alloc.offset = sizeof(header) + sizeof(MsgAlloc) * header.count;
}
alloc.length = encoded.size();
outfiles.push_back(encoded);
alloc_table.push_back(alloc);
i++;
}
i = 1;
for (auto & x : alloc_table) {
uint32_t alloc_key = (765 * i * header.key) & 0xFFFF;
alloc_key |= alloc_key << 16;
x.offset ^= alloc_key;
x.length ^= alloc_key;
i++;
}
}
int main(int argc, char ** argv) {
// msgenc TXTFILE KEYFILE CHARMAP OUTFILE
if (argc < 4)
throw invalid_argument("usage: msgenc TXTFILE KEYFILE CHARMAP OUTFILE");
read_msgs(argv[1]);
read_key(argv[2]);
read_charmap(argv[3]);
encode_messages();
ofstream outfile(argv[4], ios_base::binary);
outfile.write((char *)&header, sizeof(header));
outfile.write((char *)alloc_table.data(), sizeof(MsgAlloc) * alloc_table.size());
for (auto m : outfiles) {
outfile.write((char *)m.c_str(), m.size() * 2);
}
outfile.close();
return 0;
}
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