32 lines
1.0 KiB
JavaScript
32 lines
1.0 KiB
JavaScript
"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
|
|
let 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) {
|
|
let 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));
|
|
}
|