sc4/lib/core/ltext.js

A command line utility for automating SimCity 4 modding tasks & modifying savegames

// # ltext.ts
import { FileType } from './enums.js';
import { kFileType } from './symbols.js';
import WriteBuffer from './write-buffer.js';
// # LTEXT
// Implementation of the LTEXT file type.
export default class LText {
    static [kFileType] = FileType.LTEXT;
    value = '';
    encoding = 0x1000;
    constructor(value = '', encoding = 0x1000) {
        this.value = value;
        this.encoding = encoding;
    }
    // ## toString()
    toString() {
        return this.value;
    }
    // ## parse(rs)
    // There's something we didn't know before: the control character determines 
    // whether the encoding uses 1 or 2 bytes!
    parse(rs) {
        let length = rs.word();
        let cc = this.encoding = rs.word();
        let value = '';
        const reader = cc === 0 ? () => rs.byte() : () => rs.word();
        for (let i = 0; i < length; i++) {
            value += String.fromCharCode(reader());
        }
        this.value = value;
    }
    // ## toBuffer()
    toBuffer() {
        let cc = this.encoding;
        let writer = cc === 0 ?
            (char) => ws.byte(char) :
            (char) => ws.word(char);
        let ws = new WriteBuffer();
        ws.word(this.value.length);
        ws.word(cc);
        for (let char of this.value) {
            writer(char.charCodeAt(0));
        }
        return ws.toUint8Array();
    }
}