js-mdict/dist/esm/scanner.js

mdict (*.mdx, *.mdd) file reader. Licensed under AGPL-3.0 for better community cooperation and commercial value protection.

import { closeSync, openSync, readSync } from 'node:fs';
export class FileScanner {
    constructor(filepath) {
        this.filepath = filepath;
        this.offset = 0;
        this.fd = openSync(filepath, 'r');
    }
    close() {
        if (this.fd == 0) {
            return;
        }
        closeSync(this.fd);
    }
    readBuffer(offset, length) {
        const buffer = new Uint8Array(length);
        const readedLen = readSync(this.fd, buffer, {
            offset: 0, // here offset means the data will write into buffer's offset
            length: length,
            position: offset, // here the offset is the file's start read position
        });
        return buffer.slice(0, readedLen);
    }
    readNumber(offset, length) {
        const buffer = new ArrayBuffer(length);
        const dataView = new DataView(buffer);
        readSync(this.fd, dataView, {
            length: length,
            position: offset,
            offset: 0,
        });
        return dataView;
    }
}
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