ethers.js/packages/strings/lib.esm/bytes32.js

"use strict";
import { HashZero } from "@ethersproject/constants";
import { arrayify, concat, hexlify } from "@ethersproject/bytes";
import { toUtf8Bytes, toUtf8String } from "./utf8";
export function formatBytes32String(text) {
    // Get the bytes
    const bytes = toUtf8Bytes(text);
    // Check we have room for null-termination
    if (bytes.length > 31) {
        throw new Error("bytes32 string must be less than 32 bytes");
    }
    // Zero-pad (implicitly null-terminates)
    return hexlify(concat([bytes, HashZero]).slice(0, 32));
}
export function parseBytes32String(bytes) {
    const data = arrayify(bytes);
    // Must be 32 bytes with a null-termination
    if (data.length !== 32) {
        throw new Error("invalid bytes32 - not 32 bytes long");
    }
    if (data[31] !== 0) {
        throw new Error("invalid bytes32 string - no null terminator");
    }
    // Find the null termination
    let length = 31;
    while (data[length - 1] === 0) {
        length--;
    }
    // Determine the string value
    return toUtf8String(data.slice(0, length));
}