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