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refactor: move text encoder/decoder to util file

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This commit is contained in:
鲁树人 2023-06-17 14:28:36 +01:00
parent 65b2474b43
commit fe256218e6
4 changed files with 18 additions and 9 deletions
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4
src/decrypt-worker/crypto/qmc/qmc_v2.ts
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@ -3,6 +3,7 @@ import type { CryptoBase } from '../CryptoBase';
import type { DecryptCommandOptions } from '~/decrypt-worker/types.ts';
import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from './qmc_v2.key.ts';
import { fetchParakeet } from '@jixun/libparakeet';
import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder.ts';
export class QMC2Crypto implements CryptoBase {
cryptoName = 'QMC/v2';
@ -36,8 +37,7 @@ export class QMC2CryptoWithKey implements CryptoBase {
}
const parakeet = await fetchParakeet();
const textEncoder = new TextEncoder();
const key = textEncoder.encode(options.qmc2Key);
const key = stringToUTF8Bytes(options.qmc2Key);
const keyCrypto = parakeet.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
return transformBlob(buffer, (p) => p.make.QMCv2EKey(key, keyCrypto), {
parakeet,

10
src/decrypt-worker/util/utf8Encoder.ts Normal file
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@ -0,0 +1,10 @@
export const utf8Encoder = new TextEncoder();
export const utf8Decoder = new TextDecoder('utf-8');
export function stringToUTF8Bytes(str: string) {
return utf8Encoder.encode(str);
}
export function bytesToUTF8String(str: BufferSource) {
return utf8Decoder.decode(str);
}

5
src/util/MMKVParser.ts
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@ -1,8 +1,7 @@
import type { StagingKWMv2Key } from '~/features/settings/keyFormats';
import { bytesToUTF8String } from '~/decrypt-worker/util/utf8Encoder';
import { formatHex } from './formatHex';
const textDecoder = new TextDecoder('utf-8', { ignoreBOM: true });
export class MMKVParser {
private offset = 4;
private length: number;
@ -67,7 +66,7 @@ export class MMKVParser {
// ]
const strByteLen = this.readInt();
const data = this.readBytes(strByteLen);
return textDecoder.decode(data).normalize();
return bytesToUTF8String(data).normalize();
}
public readVariantString() {

8
src/util/levenshtein.ts
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@ -1,6 +1,6 @@
const textEncoder = new TextEncoder();
// translation of pseudocode from Wikipedia:
import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder';
// https://en.wikipedia.org/wiki/Levenshtein_distance#Iterative_with_two_matrix_rows
export function levenshtein(str1: string, str2: string) {
if (str1 === str2) {
@ -14,8 +14,8 @@ export function levenshtein(str1: string, str2: string) {
}
// Convert them to Uint8Array to avoid expensive string APIs.
const s = textEncoder.encode(str1.toLowerCase());
const t = textEncoder.encode(str2.toLowerCase());
const s = stringToUTF8Bytes(str1.normalize().toLowerCase());
const t = stringToUTF8Bytes(str2.normalize().toLowerCase());
const m = s.byteLength;
const n = t.byteLength;