mc-anvil/dist/util/binary.js

A Typescript library for reading Minecraft Anvil format files and Minecraft NBT format files in the browser.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.BinaryParser = void 0;
class BinaryParser {
    constructor(data) {
        this._getByte = () => 0;
        this._getShort = () => 0;
        this._getUShort = () => 0;
        this._getInt = () => 0;
        this._getUInt = () => 0;
        this._getFloat = () => 0;
        this._getDouble = () => 0;
        this._getInt64 = () => BigInt(0);
        this._getInt64LE = () => BigInt(0);
        this.view = new DataView(data);
        this.position = 0;
        this.bindReaders();
    }
    buffer() {
        return this.view.buffer;
    }
    bindReaders() {
        this._getByte = this.view.getUint8.bind(this.view);
        this._getShort = this.view.getInt16.bind(this.view);
        this._getUShort = this.view.getUint16.bind(this.view);
        this._getInt = this.view.getInt32.bind(this.view);
        this._getUInt = this.view.getUint32.bind(this.view);
        this._getFloat = this.view.getFloat32.bind(this.view);
        this._getDouble = this.view.getFloat64.bind(this.view);
        this._getInt64 = (byteOffset) => this.view.getBigInt64(byteOffset, true);
        this._getInt64LE = (byteOffset) => this.view.getBigInt64(byteOffset);
    }
    seek(position) {
        this.position = position;
    }
    currentPosition() {
        return this.position;
    }
    remainingLength() {
        return this.view.byteLength - this.position;
    }
    getValue(readFunc, positionIncrement) {
        const retValue = readFunc(this.position);
        this.position += positionIncrement;
        return retValue;
    }
    getBigValue(readFunc, positionIncrement) {
        const retValue = readFunc(this.position);
        this.position += positionIncrement;
        return retValue;
    }
    getByte() {
        return this.getValue(this._getByte, 1);
    }
    setByte(value) {
        this.view.setUint8(this.position++, value);
    }
    getShort() {
        return this.getValue(this._getShort, 2);
    }
    setShort(value) {
        this.view.setInt16(this.position, value);
        this.position += 2;
    }
    getUShort() {
        return this.getValue(this._getUShort, 2);
    }
    setUShort(value) {
        this.view.setUint16(this.position, value);
        this.position += 2;
    }
    getInt() {
        return this.getValue(this._getInt, 4);
    }
    setInt(value) {
        this.view.setInt32(this.position, value);
        this.position += 4;
    }
    getUInt() {
        return this.getValue(this._getUInt, 4);
    }
    setUInt(value) {
        this.view.setUint32(this.position, value);
        this.position += 4;
    }
    getFloat() {
        return this.getValue(this._getFloat, 4);
    }
    setFloat(value) {
        this.view.setFloat32(this.position, value);
        this.position += 4;
    }
    getDouble() {
        return this.getValue(this._getDouble, 8);
    }
    setDouble(value) {
        this.view.setFloat64(this.position, value);
        this.position += 8;
    }
    getNByteInteger(n) {
        const b = [];
        for (let i = 0; i < n; ++i)
            b[i] = this.view.getUint8(this.position + i);
        let value = 0;
        for (let i = 0; i < b.length; ++i)
            value = (value * 256) + b[i];
        this.position += n;
        return value;
    }
    setNByteInteger(value, n) {
        for (let i = n - 1; i >= 0; --i)
            this.setByte(Math.floor(value / Math.pow(256, i)) % 256);
    }
    getUInt64() {
        const v = this.view.getBigUint64(this.position);
        this.position += 8;
        return v;
    }
    setUInt64(value) {
        this.view.setBigUint64(this.position, value);
        this.position += 8;
    }
    getInt64() {
        return this.getBigValue(this._getInt64, 8);
    }
    setInt64(value) {
        this.view.setBigInt64(this.position, value);
        this.position += 8;
    }
    getUInt64LE() {
        const v = this.view.getBigUint64(this.position, true);
        this.position += 8;
        return v;
    }
    setUInt64LE(value) {
        this.view.setBigUint64(this.position, value, true);
        this.position += 8;
    }
    getInt64LE() {
        return this.getBigValue(this._getInt64LE, 8);
    }
    setInt64LE(value) {
        this.view.setBigUint64(this.position, value, true);
        this.position += 8;
    }
    getString(len) {
        let s = "", c;
        while ((c = this.view.getUint8(this.position++)) != 0) {
            s += String.fromCharCode(c);
            if (len && s.length == len)
                break;
        }
        return s;
    }
    setString(value) {
        for (let i = 0; i < value.length; ++i)
            this.setByte(value.charCodeAt(i));
        this.setByte(0);
    }
    getFixedLengthString(len) {
        let s = "";
        for (let i = 0; i < len; i++) {
            const c = this.view.getUint8(this.position++);
            if (c > 0)
                s += String.fromCharCode(c);
        }
        return s;
    }
    setFixedLengthString(value) {
        for (let i = 0; i < value.length; ++i)
            this.setByte(value.charCodeAt(i));
    }
    getFixedLengthTrimmedString(len) {
        let s = "";
        for (let i = 0; i < len; i++) {
            const c = this.view.getUint8(this.position++);
            if (c > 32)
                s += String.fromCharCode(c);
        }
        return s;
    }
}
exports.BinaryParser = BinaryParser;
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