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abstract/utils: reformat hexToBytes.

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Paul Miller 2023-09-13 23:57:34 +02:00 committed by GitHub
parent 1d83bab27d
commit c935b398fe
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1 changed files with 9 additions and 12 deletions
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21
src/abstract/utils.ts
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@ -44,7 +44,8 @@ export function hexToNumber(hex: string): bigint {
return BigInt(hex === '' ? '0' : `0x${hex}`);
}
const enum HexCharCode {
// We use very optimized technique to convert hex string to byte array
const enum HexC {
ZERO = 48, // 0
NINE = 57, // 9
A_UP = 65, // A
@ -54,15 +55,10 @@ const enum HexCharCode {
}
function charCodeToBase16(char: number) {
if (char >= HexCharCode.ZERO && char <= HexCharCode.NINE) {
return char - HexCharCode.ZERO;
} else if (char >= HexCharCode.A_UP && char <= HexCharCode.F_UP) {
return char - (HexCharCode.A_UP - 10);
} else if (char >= HexCharCode.A_LO && char <= HexCharCode.F_LO) {
return char - (HexCharCode.A_LO - 10);
}
throw new Error('Invalid byte sequence.');
if (char >= HexC.ZERO && char <= HexC.NINE) return char - HexC.ZERO;
else if (char >= HexC.A_UP && char <= HexC.F_UP) return char - (HexC.A_UP - 10);
else if (char >= HexC.A_LO && char <= HexC.F_LO) return char - (HexC.A_LO - 10);
throw new Error('Invalid byte sequence');
}
/**
@ -72,8 +68,9 @@ export function hexToBytes(hex: string): Uint8Array {
if (typeof hex !== 'string') throw new Error('hex string expected, got ' + typeof hex);
const len = hex.length;
if (len % 2) throw new Error('padded hex string expected, got unpadded hex of length ' + len);
const array = new Uint8Array(len / 2);
for (let i = 0, j = 0, l = array.length; i < l; i++) {
const al = len / 2;
const array = new Uint8Array(al);
for (let i = 0, j = 0; i < al; i++) {
const n1 = charCodeToBase16(hex.charCodeAt(j++));
const n2 = charCodeToBase16(hex.charCodeAt(j++));
array[i] = n1 * 16 + n2;