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Текущая директория: /opt/BitGoJS/node_modules/ethereumjs-abi/node_modules/ethereumjs-util/dist
Просмотр файла: bytes.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.baToJSON = exports.addHexPrefix = exports.toUnsigned = exports.fromSigned = exports.bufferToHex = exports.bufferToInt = exports.toBuffer = exports.stripZeros = exports.unpad = exports.setLengthRight = exports.setLength = exports.setLengthLeft = exports.zeros = void 0;
var ethjsUtil = require('ethjs-util');
var BN = require("bn.js");
/**
* Returns a buffer filled with 0s.
* @param bytes the number of bytes the buffer should be
*/
exports.zeros = function (bytes) {
return Buffer.allocUnsafe(bytes).fill(0);
};
/**
* Left Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes.
* Or it truncates the beginning if it exceeds.
* @param msg the value to pad (Buffer|Array)
* @param length the number of bytes the output should be
* @param right whether to start padding form the left or right
* @return (Buffer|Array)
*/
exports.setLengthLeft = function (msg, length, right) {
if (right === void 0) { right = false; }
var buf = exports.zeros(length);
msg = exports.toBuffer(msg);
if (right) {
if (msg.length < length) {
msg.copy(buf);
return buf;
}
return msg.slice(0, length);
}
else {
if (msg.length < length) {
msg.copy(buf, length - msg.length);
return buf;
}
return msg.slice(-length);
}
};
exports.setLength = exports.setLengthLeft;
/**
* Right Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes.
* Or it truncates the beginning if it exceeds.
* @param msg the value to pad (Buffer|Array)
* @param length the number of bytes the output should be
* @return (Buffer|Array)
*/
exports.setLengthRight = function (msg, length) {
return exports.setLength(msg, length, true);
};
/**
* Trims leading zeros from a `Buffer` or an `Array`.
* @param a (Buffer|Array|String)
* @return (Buffer|Array|String)
*/
exports.unpad = function (a) {
a = ethjsUtil.stripHexPrefix(a);
var first = a[0];
while (a.length > 0 && first.toString() === '0') {
a = a.slice(1);
first = a[0];
}
return a;
};
exports.stripZeros = exports.unpad;
/**
* Attempts to turn a value into a `Buffer`. As input it supports `Buffer`, `String`, `Number`, null/undefined, `BN` and other objects with a `toArray()` method.
* @param v the value
*/
exports.toBuffer = function (v) {
if (!Buffer.isBuffer(v)) {
if (Array.isArray(v)) {
v = Buffer.from(v);
}
else if (typeof v === 'string') {
if (ethjsUtil.isHexString(v)) {
v = Buffer.from(ethjsUtil.padToEven(ethjsUtil.stripHexPrefix(v)), 'hex');
}
else {
throw new Error("Cannot convert string to buffer. toBuffer only supports 0x-prefixed hex strings and this string was given: " + v);
}
}
else if (typeof v === 'number') {
v = ethjsUtil.intToBuffer(v);
}
else if (v === null || v === undefined) {
v = Buffer.allocUnsafe(0);
}
else if (BN.isBN(v)) {
v = v.toArrayLike(Buffer);
}
else if (v.toArray) {
// converts a BN to a Buffer
v = Buffer.from(v.toArray());
}
else {
throw new Error('invalid type');
}
}
return v;
};
/**
* Converts a `Buffer` to a `Number`.
* @param buf `Buffer` object to convert
* @throws If the input number exceeds 53 bits.
*/
exports.bufferToInt = function (buf) {
return new BN(exports.toBuffer(buf)).toNumber();
};
/**
* Converts a `Buffer` into a `0x`-prefixed hex `String`.
* @param buf `Buffer` object to convert
*/
exports.bufferToHex = function (buf) {
buf = exports.toBuffer(buf);
return '0x' + buf.toString('hex');
};
/**
* Interprets a `Buffer` as a signed integer and returns a `BN`. Assumes 256-bit numbers.
* @param num Signed integer value
*/
exports.fromSigned = function (num) {
return new BN(num).fromTwos(256);
};
/**
* Converts a `BN` to an unsigned integer and returns it as a `Buffer`. Assumes 256-bit numbers.
* @param num
*/
exports.toUnsigned = function (num) {
return Buffer.from(num.toTwos(256).toArray());
};
/**
* Adds "0x" to a given `String` if it does not already start with "0x".
*/
exports.addHexPrefix = function (str) {
if (typeof str !== 'string') {
return str;
}
return ethjsUtil.isHexPrefixed(str) ? str : '0x' + str;
};
/**
* Converts a `Buffer` or `Array` to JSON.
* @param ba (Buffer|Array)
* @return (Array|String|null)
*/
exports.baToJSON = function (ba) {
if (Buffer.isBuffer(ba)) {
return "0x" + ba.toString('hex');
}
else if (ba instanceof Array) {
var array = [];
for (var i = 0; i < ba.length; i++) {
array.push(exports.baToJSON(ba[i]));
}
return array;
}
};
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