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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/c32check/lib
Просмотр файла: encoding.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.c32decode = exports.c32normalize = exports.c32encode = exports.c32 = void 0;
var buffer_1 = require("buffer/");
exports.c32 = '0123456789ABCDEFGHJKMNPQRSTVWXYZ';
var hex = '0123456789abcdef';
/**
 * Encode a hex string as a c32 string.  Note that the hex string is assumed
 * to be big-endian (and the resulting c32 string will be as well).
 * @param {string} inputHex - the input to encode
 * @param {number} minLength - the minimum length of the c32 string
 * @returns {string} the c32check-encoded representation of the data, as a string
 */
function c32encode(inputHex, minLength) {
    // must be hex
    if (!inputHex.match(/^[0-9a-fA-F]*$/)) {
        throw new Error('Not a hex-encoded string');
    }
    if ((inputHex.length) % 2 !== 0) {
        inputHex = "0" + inputHex;
    }
    inputHex = inputHex.toLowerCase();
    var res = [];
    var carry = 0;
    for (var i = inputHex.length - 1; i >= 0; i--) {
        if (carry < 4) {
            var currentCode = hex.indexOf(inputHex[i]) >> carry;
            var nextCode = 0;
            if (i !== 0) {
                nextCode = hex.indexOf(inputHex[i - 1]);
            }
            // carry = 0, nextBits is 1, carry = 1, nextBits is 2
            var nextBits = 1 + carry;
            var nextLowBits = (nextCode % (1 << nextBits)) << (5 - nextBits);
            var curC32Digit = exports.c32[currentCode + nextLowBits];
            carry = nextBits;
            res.unshift(curC32Digit);
        }
        else {
            carry = 0;
        }
    }
    var C32leadingZeros = 0;
    for (var i = 0; i < res.length; i++) {
        if (res[i] !== '0') {
            break;
        }
        else {
            C32leadingZeros++;
        }
    }
    res = res.slice(C32leadingZeros);
    var zeroPrefix = buffer_1.Buffer.from(inputHex, 'hex').toString().match(/^\u0000*/);
    var numLeadingZeroBytesInHex = zeroPrefix ? zeroPrefix[0].length : 0;
    for (var i = 0; i < numLeadingZeroBytesInHex; i++) {
        res.unshift(exports.c32[0]);
    }
    if (minLength) {
        var count = minLength - res.length;
        for (var i = 0; i < count; i++) {
            res.unshift(exports.c32[0]);
        }
    }
    return res.join('');
}
exports.c32encode = c32encode;
/*
 * Normalize a c32 string
 * @param {string} c32input - the c32-encoded input string
 * @returns {string} the canonical representation of the c32 input string
 */
function c32normalize(c32input) {
    // must be upper-case
    // replace all O's with 0's
    // replace all I's and L's with 1's
    return c32input.toUpperCase()
        .replace(/O/g, '0')
        .replace(/L|I/g, '1');
}
exports.c32normalize = c32normalize;
/*
 * Decode a c32 string back into a hex string.  Note that the c32 input
 * string is assumed to be big-endian (and the resulting hex string will
 * be as well).
 * @param {string} c32input - the c32-encoded input to decode
 * @param {number} minLength - the minimum length of the output hex string (in bytes)
 * @returns {string} the hex-encoded representation of the data, as a string
 */
function c32decode(c32input, minLength) {
    c32input = c32normalize(c32input);
    // must result in a c32 string
    if (!c32input.match("^[" + exports.c32 + "]*$")) {
        throw new Error('Not a c32-encoded string');
    }
    var zeroPrefix = c32input.match("^" + exports.c32[0] + "*");
    var numLeadingZeroBytes = zeroPrefix ? zeroPrefix[0].length : 0;
    var res = [];
    var carry = 0;
    var carryBits = 0;
    for (var i = c32input.length - 1; i >= 0; i--) {
        if (carryBits === 4) {
            res.unshift(hex[carry]);
            carryBits = 0;
            carry = 0;
        }
        var currentCode = exports.c32.indexOf(c32input[i]) << carryBits;
        var currentValue = currentCode + carry;
        var currentHexDigit = hex[currentValue % 16];
        carryBits += 1;
        carry = currentValue >> 4;
        if (carry > 1 << carryBits) {
            throw new Error('Panic error in decoding.');
        }
        res.unshift(currentHexDigit);
    }
    // one last carry
    res.unshift(hex[carry]);
    if (res.length % 2 === 1) {
        res.unshift('0');
    }
    var hexLeadingZeros = 0;
    for (var i = 0; i < res.length; i++) {
        if (res[i] !== '0') {
            break;
        }
        else {
            hexLeadingZeros++;
        }
    }
    res = res.slice(hexLeadingZeros - (hexLeadingZeros % 2));
    var hexStr = res.join('');
    for (var i = 0; i < numLeadingZeroBytes; i++) {
        hexStr = "00" + hexStr;
    }
    if (minLength) {
        var count = minLength * 2 - hexStr.length;
        for (var i = 0; i < count; i += 2) {
            hexStr = "00" + hexStr;
        }
    }
    return hexStr;
}
exports.c32decode = c32decode;
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