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Unity PlayerPrefs parser and dumper in JavaScript
112 lines (111 loc) • 3.73 kB
JavaScript
;
// https://answers.unity.com/questions/147431/how-can-i-view-a-webplayer-playerprefs-file.html
Object.defineProperty(exports, "__esModule", { value: true });
exports.dump = exports.load = void 0;
const HEADER = "UnityPrf";
const V1 = 0x10000;
const V2 = 0x100000;
const T_STRING = 0x80;
const T_FLOAT = 0xfd;
const T_INT = 0xfe;
function load(buf) {
const view = new DataView(buf);
// TODO: TextDecoder seems to be slower than buffer at node.js
// https://github.com/nodejs/node/issues/39879
const decoder = new TextDecoder();
const res = {};
// header
if (
// subarray is slower than slice
decoder.decode(buf.slice(0, 8)) !== HEADER ||
view.getUint32(8, true) !== V1 ||
view.getUint32(12, true) !== V2) {
throw new Error("incorrect header");
}
let offset = 16;
while (buf.byteLength > offset) {
const keyLen = view.getUint8(offset);
offset += 1;
const key = decoder.decode(buf.slice(offset, offset + keyLen));
offset += keyLen;
const type = view.getUint8(offset);
// console.log(type.toString(16));
offset += 1;
let v;
if (type < T_STRING) {
v = decoder.decode(buf.slice(offset, offset + type));
offset += type;
}
else if (type === T_STRING) {
const valueLen = view.getUint32(offset, true);
offset += 4;
v = decoder.decode(buf.slice(offset, offset + valueLen));
offset += valueLen;
}
else if (type === T_FLOAT) {
v = view.getFloat32(offset, true);
offset += 4;
}
else if (type === T_INT) {
v = view.getInt32(offset, true);
offset += 4;
}
else {
throw new Error("unknown type");
}
res[key] = v;
}
return res;
}
exports.load = load;
function merge(b0, b1) {
var tmp = new Uint8Array(b0.byteLength + b1.byteLength);
tmp.set(new Uint8Array(b0));
tmp.set(new Uint8Array(b1), b0.byteLength);
return tmp.buffer;
}
function dump(value) {
const encoder = new TextEncoder();
let buf = new ArrayBuffer(16);
// header
new Uint8Array(buf).set(encoder.encode(HEADER));
const view = new DataView(buf);
view.setUint32(8, V1, true);
view.setUint32(12, V2, true);
for (const [k, v] of Object.entries(value)) {
buf = merge(buf, Uint8Array.of(k.length).buffer);
buf = merge(buf, encoder.encode(k).buffer);
if (typeof v === "string") {
if (v.length < T_STRING) {
buf = merge(buf, Uint8Array.of(v.length).buffer);
buf = merge(buf, encoder.encode(v).buffer);
}
else {
buf = merge(buf, Uint8Array.of(T_STRING).buffer);
const lenBuf = new ArrayBuffer(4);
new DataView(lenBuf).setUint32(0, v.length, true);
buf = merge(buf, lenBuf);
buf = merge(buf, encoder.encode(v).buffer);
}
}
else if (typeof v === "number") {
if (v % 1 === 0) {
buf = merge(buf, Uint8Array.of(T_INT));
const vBuf = new ArrayBuffer(4);
new DataView(vBuf).setUint32(0, v, true);
buf = merge(buf, vBuf);
}
else {
buf = merge(buf, Uint8Array.of(T_FLOAT));
const vBuf = new ArrayBuffer(4);
new DataView(vBuf).setFloat32(0, v, true);
buf = merge(buf, vBuf);
}
}
else {
throw new Error("unsupported type");
}
}
return buf;
}
exports.dump = dump;