@kraken-crypto/ccxt
Version:
A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go
54 lines (53 loc) • 1.85 kB
JavaScript
import { toHex } from '../num.js';
import { decodeShortString, encodeShortString, splitLongString } from '../shortString.js';
/**
* convert a Cairo ByteArray to a JS string
* @param myByteArray Cairo representation of a LongString
* @returns a JS string
* @example
* ```typescript
* const myByteArray = {
* data: [],
* pending_word: '0x414243444546474849',
* pending_word_len: 9
* }
* const result: String = stringFromByteArray(myByteArray); // ABCDEFGHI
* ```
*/
export function stringFromByteArray(myByteArray) {
const pending_word = BigInt(myByteArray.pending_word) === 0n
? ''
: decodeShortString(toHex(myByteArray.pending_word));
return (myByteArray.data.reduce((cumuledString, encodedString) => {
const add = BigInt(encodedString) === 0n ? '' : decodeShortString(toHex(encodedString));
return cumuledString + add;
}, '') + pending_word);
}
/**
* convert a JS string to a Cairo ByteArray
* @param targetString a JS string
* @returns Cairo representation of a LongString
* @example
* ```typescript
* const myByteArray: ByteArray = byteArrayFromString("ABCDEFGHI");
* ```
* Result is :
* {
* data: [],
* pending_word: '0x414243444546474849',
* pending_word_len: 9
* }
*/
export function byteArrayFromString(targetString) {
const shortStrings = splitLongString(targetString);
const remainder = shortStrings[shortStrings.length - 1];
const shortStringsEncoded = shortStrings.map(encodeShortString);
const [pendingWord, pendingWordLength] = remainder === undefined || remainder.length === 31
? ['0x00', 0]
: [shortStringsEncoded.pop(), remainder.length];
return {
data: shortStringsEncoded.length === 0 ? [] : shortStringsEncoded,
pending_word: pendingWord,
pending_word_len: pendingWordLength,
};
}