@kraken-crypto/ccxt/dist/cjs/src/static_dependencies/ethers/utils/data.js

A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var errors = require('./errors.js');

/**
 *  Some data helpers.
 *
 *
 *  @_subsection api/utils:Data Helpers  [about-data]
 */
function _getBytes(value, name, copy) {
    if (value instanceof Uint8Array) {
        if (copy) {
            return new Uint8Array(value);
        }
        return value;
    }
    if (typeof (value) === "string" && value.match(/^0x([0-9a-f][0-9a-f])*$/i)) {
        const result = new Uint8Array((value.length - 2) / 2);
        let offset = 2;
        for (let i = 0; i < result.length; i++) {
            result[i] = parseInt(value.substring(offset, offset + 2), 16);
            offset += 2;
        }
        return result;
    }
    errors.assertArgument(false, "invalid BytesLike value", name || "value", value);
}
/**
 *  Get a typed Uint8Array for %%value%%. If already a Uint8Array
 *  the original %%value%% is returned; if a copy is required use
 *  [[getBytesCopy]].
 *
 *  @see: getBytesCopy
 */
function getBytes(value, name) {
    return _getBytes(value, name, false);
}
/**
 *  Get a typed Uint8Array for %%value%%, creating a copy if necessary
 *  to prevent any modifications of the returned value from being
 *  reflected elsewhere.
 *
 *  @see: getBytes
 */
function getBytesCopy(value, name) {
    return _getBytes(value, name, true);
}
/**
 *  Returns true if %%value%% is a valid [[HexString]].
 *
 *  If %%length%% is ``true`` or a //number//, it also checks that
 *  %%value%% is a valid [[DataHexString]] of %%length%% (if a //number//)
 *  bytes of data (e.g. ``0x1234`` is 2 bytes).
 */
function isHexString(value, length) {
    if (typeof (value) !== "string" || !value.match(/^0x[0-9A-Fa-f]*$/)) {
        return false;
    }
    if (typeof (length) === "number" && value.length !== 2 + 2 * length) {
        return false;
    }
    if (length === true && (value.length % 2) !== 0) {
        return false;
    }
    return true;
}
/**
 *  Returns true if %%value%% is a valid representation of arbitrary
 *  data (i.e. a valid [[DataHexString]] or a Uint8Array).
 */
function isBytesLike(value) {
    return (isHexString(value, true) || (value instanceof Uint8Array));
}
const HexCharacters = "0123456789abcdef";
/**
 *  Returns a [[DataHexString]] representation of %%data%%.
 */
function hexlify(data) {
    const bytes = getBytes(data);
    let result = "0x";
    for (let i = 0; i < bytes.length; i++) {
        const v = bytes[i];
        result += HexCharacters[(v & 0xf0) >> 4] + HexCharacters[v & 0x0f];
    }
    return result;
}
/**
 *  Returns a [[DataHexString]] by concatenating all values
 *  within %%data%%.
 */
function concat(datas) {
    return "0x" + datas.map((d) => hexlify(d).substring(2)).join("");
}
function zeroPad(data, length, left) {
    const bytes = getBytes(data);
    errors.assert(length >= bytes.length, "padding exceeds data length", "BUFFER_OVERRUN", {
        buffer: new Uint8Array(bytes),
        length: length,
        offset: length + 1
    });
    const result = new Uint8Array(length);
    result.fill(0);
    if (left) {
        result.set(bytes, length - bytes.length);
    }
    else {
        result.set(bytes, 0);
    }
    return hexlify(result);
}
/**
 *  Return the [[DataHexString]] of %%data%% padded on the **left**
 *  to %%length%% bytes.
 *
 *  If %%data%% already exceeds %%length%%, a [[BufferOverrunError]] is
 *  thrown.
 *
 *  This pads data the same as **values** are in Solidity
 *  (e.g. ``uint128``).
 */
function zeroPadValue(data, length) {
    return zeroPad(data, length, true);
}

exports.concat = concat;
exports.getBytes = getBytes;
exports.getBytesCopy = getBytesCopy;
exports.hexlify = hexlify;
exports.isBytesLike = isBytesLike;
exports.isHexString = isHexString;
exports.zeroPadValue = zeroPadValue;