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exgdump.js
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exgdump.js
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/*
Extreme-G (U) ROM decompressor
Usage:
node exgdump.js <rom_path> <dump_dir_path>
*/
const fs = require('fs');
const lzss = require('./js/lzss.js');
const lzhuf = require('./js/lzhuf.js');
const EXG_NUM_LEVELS = 18;
const EXG_LEVEL_TABLE_ADDR = 0x00001408;
const EXG_LZSS_BANK0_ADDR = 0x000014A0;
const EXG_LZSS_BANK1_ADDR = 0x007A2DF0;
const EXG_LZSS_MAGIC = 0x4C5A5353;
function padleft(str, len, chr)
{
for(; str.length < len; str = chr + str);
return str;
}
function padright(str, len, chr)
{
for(; str.length < len; str = str + chr);
return str;
}
function hex(num, len)
{
return padleft(num.toString(16).toUpperCase(), len || 8, '0');
}
function dumpLzssBank(dvRom, bankAddr, dirPath)
{
makedir(dirPath);
console.log("dumping lzss bank " + hex(bankAddr) + " ...\n");
var numFiles = dvRom.getUint32(bankAddr + 0x00);
for(var i = 0; i < numFiles; i++)
{
var entryAddr = bankAddr + 0x08 + (i*16);
var offset = dvRom.getUint32(entryAddr + 0x00);
var magic = dvRom.getUint32(entryAddr + 0x04);
var dstSize = dvRom.getUint32(entryAddr + 0x08);
var srcSize = dvRom.getUint32(entryAddr + 0x0C);
var srcAddr = bankAddr + offset;
console.log(" src: " + hex(srcAddr) + " srcSize: " + hex(srcSize) + " dstSize: " + hex(dstSize));
var dvSrc = new DataView(dvRom.buffer, srcAddr);
var dvDst = new DataView(new ArrayBuffer(dstSize));
lzss.decode(dvSrc, dvDst, dstSize);
var name = padleft(srcAddr.toString(16).toUpperCase(), 8, "0") + ".bin";
fs.writeFileSync(dirPath + "/" + name, Buffer.from(dvDst.buffer));
}
console.log("");
}
function lzhuf_load(dvRom, romAddress, dstSize)
{
var dvSrc = new DataView(dvRom.buffer, romAddress);
var dvDst = new DataView(new ArrayBuffer(dstSize));
lzhuf.decode(dvSrc, dvDst, dstSize);
return dvDst;
}
function dumpLevels(dvRom, levelTableAddr, dirPath)
{
makedir(dirPath);
console.log("dumping level data ...\n")
for(var i = 0; i < EXG_NUM_LEVELS; i++)
{
var infoAddr = dvRom.getUint32(levelTableAddr + i*4);
var info = new LevelInfo(dvRom, infoAddr);
var levelName = "level_" + hex(i,2);
var levelDirPath = dirPath + "/" + levelName;
var lvPref = levelName + ".";
console.log(" " + levelName + "\n");
makedir(levelDirPath);
function _dumpLevelFile(name, offsFileInfo)
{
var fileAddr = infoAddr + dvRom.getUint32(infoAddr + offsFileInfo);
var dstSize = dvRom.getUint32(infoAddr + offsFileInfo + 0x04);
if(offsFileInfo == 0x0C) { dstSize *= 12; } // oh well
var data = lzhuf_load(dvRom, fileAddr, dstSize);
var srcSize = lzhuf.numBytesRead;
var fileName = lvPref + name + "." + hex(fileAddr);
fs.writeFileSync(levelDirPath + "/" + fileName + ".bin", Buffer.from(data.buffer));
console.log(" " + padright(name, 5, " ") + " ",
"src: " + hex(fileAddr),
"srcSize: " + hex(srcSize),
"dstSize: " + hex(dstSize));
}
_dumpLevelFile("texmeta", 0x0C);
_dumpLevelFile("textures", 0x14);
_dumpLevelFile("unk1C", 0x1C);
_dumpLevelFile("unk34", 0x34);
_dumpLevelFile("gfx", 0x3C);
console.log("");
}
}
function dumpOtherStuff(dvRom, dirPath)
{
makedir(dirPath);
console.log("dumping other lzss bank 00001288 ...\n");
var BASE = 0x00001288;
for(var i = 0; i < 24; i++)
{
var entryAddr = BASE + i*16;
var fileAddr = dvRom.getUint32(entryAddr + 0x00);
var srcSize = dvRom.getUint32(entryAddr + 0x04);
var dstSize = dvRom.getUint32(fileAddr);
console.log(" " +
"src: " + hex(fileAddr + 4),
"srcSize: " + hex(srcSize - 4),
"dstSize: " + hex(dstSize));
var src = new DataView(dvRom.buffer, fileAddr + 4, srcSize - 4);
var dst = new DataView(new ArrayBuffer(dstSize));
lzss.decode(src, dst, dstSize);
fs.writeFileSync(dirPath + "/" + hex(fileAddr) + ".bin", Buffer.from(dst.buffer));
}
console.log("");
}
function makedir(path)
{
if(!fs.existsSync(path))
{
fs.mkdirSync(path);
}
}
function dumpMisc(dvRom, addr, dumpDir, prefix)
{
prefix = prefix || "";
var dstSize = dvRom.getUint32(addr);
var data = lzhuf_load(dvRom, addr+4, dstSize);
fs.writeFileSync(dumpDir + "/" + prefix + hex(addr+4) + ".bin", Buffer.from(data.buffer));
console.log(" src: " + hex(addr+4) + " srcSize: " + hex(lzhuf.numBytesRead) + " dstSize: " + hex(dstSize));
}
function dumpTable1450(dvRom, dumpDirPath)
{
console.log("dumping table 00001450 ...\n");
makedir(dumpDirPath)
dumpMisc(dvRom, 0x000C6690, dumpDirPath, "texbank.");
dumpMisc(dvRom, 0x000CE500, dumpDirPath, "texbank.");
dumpMisc(dvRom, 0x000D5C40, dumpDirPath, "texbank.");
dumpMisc(dvRom, 0x000DC550, dumpDirPath, "texbank.");
console.log("");
}
function main()
{
if(process.argv.length < 4)
{
console.log("usage: node exgdump.js <rom_path> <dump_dir_path>");
return;
}
var romPath = process.argv[2];
var dumpDirPath = process.argv[3];
var dvRom = new DataView(fs.readFileSync(romPath).buffer);
makedir(dumpDirPath);
dumpLzssBank(dvRom, EXG_LZSS_BANK0_ADDR, dumpDirPath + "/lzssbank0");
dumpLzssBank(dvRom, EXG_LZSS_BANK1_ADDR, dumpDirPath + "/lzssbank1");
dumpOtherStuff(dvRom, dumpDirPath + "/lzss_1288");
dumpTable1450(dvRom, dumpDirPath + "/table_1450");
console.log("dumping miscellaneous ...\n");
dumpMisc(dvRom, 0x000C3400, dumpDirPath, "texbank.");
dumpMisc(dvRom, 0x0002F480, dumpDirPath);
console.log("");
dumpLevels(dvRom, EXG_LEVEL_TABLE_ADDR, dumpDirPath + "/leveldata");
}
main();
function LevelInfo(dv, offset)
{
this.offsTransformations = dv.getUint32(offset + 0x00);
this.numTransformations = dv.getUint32(offset + 0x04);
this.offsTexMeta = dv.getUint32(offset + 0x0C);
this.numTexMetaEntries = dv.getUint32(offset + 0x10); // dstSize is this * 12
this.offsTextures = dv.getUint32(offset + 0x14);
this.sizeTextures = dv.getUint32(offset + 0x18);
this.offsUnk1C = dv.getUint32(offset + 0x1C);
this.sizeUnk1C = dv.getUint32(offset + 0x20);
this.offsUnk34 = dv.getUint32(offset + 0x34);
this.sizeUnk34 = dv.getUint32(offset + 0x38);
this.offsGfx = dv.getUint32(offset + 0x3C);
this.gfxSize = dv.getUint32(offset + 0x40);
}