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feat: print performance logs to console.

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鲁树人
2023-05-21 17:58:54 +01:00
parent c4e3999546
commit 4cfc672646
12 changed files with 171 additions and 92 deletions
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33
src/decrypt-worker/crypto/xiami/xiami.ts
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@@ -11,8 +11,9 @@
import type { CryptoBase } from '../CryptoBase';
const XIAMI_FILE_MAGIC = new Uint8Array('ifmt'.split('').map((x) => x.charCodeAt(0)));
const XIAMI_EXPECTED_PADDING = new Uint8Array([0xfe, 0xfe, 0xfe, 0xfe]);
// little endian
const XIAMI_FILE_MAGIC = 0x746d6669;
const XIAMI_EXPECTED_PADDING = 0xfefefefe;
const u8Sub = (a: number, b: number) => {
if (a > b) {
@@ -23,29 +24,25 @@ const u8Sub = (a: number, b: number) => {
};
export class XiamiCrypto implements CryptoBase {
hasSignature(): boolean {
return true;
cryptoName = 'Xiami';
checkByDecryptHeader = false;
decryptTargetAudio = true;
async checkBySignature(buffer: ArrayBuffer): Promise<boolean> {
const header = new DataView(buffer);
return header.getUint32(0x00, true) === XIAMI_FILE_MAGIC && header.getUint32(0x08, true) === XIAMI_EXPECTED_PADDING;
}
async isSupported(blob: Blob): Promise<boolean> {
const headerBuffer = await blob.slice(0, 0x10).arrayBuffer();
const header = new Uint8Array(headerBuffer);
return (
header.slice(0x00, 0x04).every((b, i) => b === XIAMI_FILE_MAGIC[i]) &&
header.slice(0x08, 0x0c).every((b, i) => b === XIAMI_EXPECTED_PADDING[i])
);
}
async decrypt(blob: Blob): Promise<Blob> {
const headerBuffer = await blob.slice(0, 0x10).arrayBuffer();
async decrypt(src: ArrayBuffer): Promise<ArrayBuffer> {
const headerBuffer = src.slice(0, 0x10);
const header = new Uint8Array(headerBuffer);
const key = u8Sub(header[0x0f], 1);
const plainTextSize = header[0x0c] | (header[0x0d] << 8) | (header[0x0e] << 16);
const decrypted = new Uint8Array(await blob.slice(0x10).arrayBuffer());
const decrypted = new Uint8Array(src.slice(0x10));
for (let i = decrypted.byteLength - 1; i >= plainTextSize; i--) {
decrypted[i] = u8Sub(key, decrypted[i]);
}
return new Blob([decrypted]);
return decrypted;
}
}