ethers.js/utils/bytes.js

"use strict";
/**
 *  Conversion Utilities
 *
 */
Object.defineProperty(exports, "__esModule", { value: true });
var errors = require("./errors");
function isBigNumber(value) {
    return !!value._bn;
}
function addSlice(array) {
    if (array.slice) {
        return array;
    }
    array.slice = function () {
        var args = Array.prototype.slice.call(arguments);
        return new Uint8Array(Array.prototype.slice.apply(array, args));
    };
    return array;
}
function isArrayish(value) {
    if (!value || parseInt(String(value.length)) != value.length || typeof (value) === 'string') {
        return false;
    }
    for (var i = 0; i < value.length; i++) {
        var v = value[i];
        if (v < 0 || v >= 256 || parseInt(String(v)) != v) {
            return false;
        }
    }
    return true;
}
exports.isArrayish = isArrayish;
function arrayify(value) {
    if (value == null) {
        errors.throwError('cannot convert null value to array', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
    }
    if (isBigNumber(value)) {
        value = value.toHexString();
    }
    if (typeof (value) === 'string') {
        var match = value.match(/^(0x)?[0-9a-fA-F]*$/);
        if (!match) {
            errors.throwError('invalid hexidecimal string', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
        }
        if (match[1] !== '0x') {
            errors.throwError('hex string must have 0x prefix', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
        }
        value = value.substring(2);
        if (value.length % 2) {
            value = '0' + value;
        }
        var result = [];
        for (var i = 0; i < value.length; i += 2) {
            result.push(parseInt(value.substr(i, 2), 16));
        }
        return addSlice(new Uint8Array(result));
    }
    else if (typeof (value) === 'string') {
    }
    if (isArrayish(value)) {
        return addSlice(new Uint8Array(value));
    }
    errors.throwError('invalid arrayify value', null, { arg: 'value', value: value, type: typeof (value) });
    return null;
}
exports.arrayify = arrayify;
function concat(objects) {
    var arrays = [];
    var length = 0;
    for (var i = 0; i < objects.length; i++) {
        var object = arrayify(objects[i]);
        arrays.push(object);
        length += object.length;
    }
    var result = new Uint8Array(length);
    var offset = 0;
    for (var i = 0; i < arrays.length; i++) {
        result.set(arrays[i], offset);
        offset += arrays[i].length;
    }
    return addSlice(result);
}
exports.concat = concat;
function stripZeros(value) {
    var result = arrayify(value);
    if (result.length === 0) {
        return result;
    }
    // Find the first non-zero entry
    var start = 0;
    while (result[start] === 0) {
        start++;
    }
    // If we started with zeros, strip them
    if (start) {
        result = result.slice(start);
    }
    return result;
}
exports.stripZeros = stripZeros;
function padZeros(value, length) {
    value = arrayify(value);
    if (length < value.length) {
        throw new Error('cannot pad');
    }
    var result = new Uint8Array(length);
    result.set(value, length - value.length);
    return addSlice(result);
}
exports.padZeros = padZeros;
function isHexString(value, length) {
    if (typeof (value) !== 'string' || !value.match(/^0x[0-9A-Fa-f]*$/)) {
        return false;
    }
    if (length && value.length !== 2 + 2 * length) {
        return false;
    }
    return true;
}
exports.isHexString = isHexString;
var HexCharacters = '0123456789abcdef';
function hexlify(value) {
    if (isBigNumber(value)) {
        return value.toHexString();
    }
    if (typeof (value) === 'number') {
        if (value < 0) {
            errors.throwError('cannot hexlify negative value', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
        }
        var hex = '';
        while (value) {
            hex = HexCharacters[value & 0x0f] + hex;
            value = Math.floor(value / 16);
        }
        if (hex.length) {
            if (hex.length % 2) {
                hex = '0' + hex;
            }
            return '0x' + hex;
        }
        return '0x00';
    }
    if (typeof (value) === 'string') {
        var match = value.match(/^(0x)?[0-9a-fA-F]*$/);
        if (!match) {
            errors.throwError('invalid hexidecimal string', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
        }
        if (match[1] !== '0x') {
            errors.throwError('hex string must have 0x prefix', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
        }
        if (value.length % 2) {
            value = '0x0' + value.substring(2);
        }
        return value;
    }
    if (isArrayish(value)) {
        var result = [];
        for (var i = 0; i < value.length; i++) {
            var v = value[i];
            result.push(HexCharacters[(v & 0xf0) >> 4] + HexCharacters[v & 0x0f]);
        }
        return '0x' + result.join('');
    }
    errors.throwError('invalid hexlify value', null, { arg: 'value', value: value });
    return 'never';
}
exports.hexlify = hexlify;
function hexDataLength(data) {
    if (!isHexString(data) || (data.length % 2) !== 0) {
        return null;
    }
    return (data.length - 2) / 2;
}
exports.hexDataLength = hexDataLength;
function hexDataSlice(data, offset, length) {
    if (!isHexString(data)) {
        errors.throwError('invalid hex data', errors.INVALID_ARGUMENT, { arg: 'value', value: data });
    }
    if ((data.length % 2) !== 0) {
        errors.throwError('hex data length must be even', errors.INVALID_ARGUMENT, { arg: 'value', value: data });
    }
    offset = 2 + 2 * offset;
    if (length != null) {
        return '0x' + data.substring(offset, offset + 2 * length);
    }
    return '0x' + data.substring(offset);
}
exports.hexDataSlice = hexDataSlice;
function hexStripZeros(value) {
    if (!isHexString(value)) {
        errors.throwError('invalid hex string', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
    }
    while (value.length > 3 && value.substring(0, 3) === '0x0') {
        value = '0x' + value.substring(3);
    }
    return value;
}
exports.hexStripZeros = hexStripZeros;
function hexZeroPad(value, length) {
    if (!isHexString(value)) {
        errors.throwError('invalid hex string', errors.INVALID_ARGUMENT, { arg: 'value', value: value });
    }
    while (value.length < 2 * length + 2) {
        value = '0x0' + value.substring(2);
    }
    return value;
}
exports.hexZeroPad = hexZeroPad;
function splitSignature(signature) {
    var bytes = arrayify(signature);
    if (bytes.length !== 65) {
        throw new Error('invalid signature');
    }
    var v = bytes[64];
    if (v !== 27 && v !== 28) {
        v = 27 + (v % 2);
    }
    return {
        r: hexlify(bytes.slice(0, 32)),
        s: hexlify(bytes.slice(32, 64)),
        recoveryParam: (v - 27),
        v: v
    };
}
exports.splitSignature = splitSignature;
function joinSignature(signature) {
    return hexlify(concat([
        hexZeroPad(signature.r, 32),
        hexZeroPad(signature.s, 32),
        (signature.recoveryParam ? '0x1c' : '0x1b')
    ]));
}
exports.joinSignature = joinSignature;