emvco-qr-sdk/dist/application/utils/validators/validate-tlv-format.util.js

A robust TypeScript SDK for decoding, validating, and processing EMVCo-compliant QR codes used in digital payment systems.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isValidTLVFormat = isValidTLVFormat;
const tag_1 = require("../../../domain/value-objects/tag");
/**
 * Checks if a string appears to be in a valid TLV format (superficial validation).
 *
 * This does NOT guarantee the entire structure is valid — it only checks the initial pattern.
 *
 * @param tlv - The raw string to validate.
 * @returns True if the string starts with a valid TLV structure, false otherwise.
 */
function isValidTLVFormat(tlv) {
    if (!tlv || tlv.length < 4)
        return false;
    const tag = tlv.substring(0, 2);
    const lengthStr = tlv.substring(2, 4);
    const length = parseInt(lengthStr, 10);
    return tag_1.Tag.isValid(tag) && !isNaN(length) && 4 + length <= tlv.length;
}