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Merge pull request 'bugfix for #36 #50' (#59) from nullptr-0/web:pr into master

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Reviewed-on: https://git.unlock-music.dev/um/web/pulls/59
Reviewed-by: jixunmoe <jixunmoe@noreply.unlock-music.dev>
This commit is contained in:
鲁树人 2023-08-28 17:10:02 +00:00
commit 821d936b2c
2 changed files with 13 additions and 12 deletions
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18
src/decrypt/kgm_wasm.ts
View File

@ -2,7 +2,7 @@ import { KgmCrypto } from '@xhacker/kgmwasm/KgmWasmBundle';
import KgmCryptoModule from '@xhacker/kgmwasm/KgmWasmBundle';
import { MergeUint8Array } from '@/utils/MergeUint8Array';
// 每次处理 2M 的数据
// 每次可以处理 2M 的数据
const DECRYPTION_BUF_SIZE = 2 *1024 * 1024;
export interface KGMDecryptionResult {
@ -36,12 +36,12 @@ export async function DecryptKgmWasm(kgmBlob: ArrayBuffer, ext: string): Promise
// 申请内存块，并文件末端数据到 WASM 的内存堆
let kgmBuf = new Uint8Array(kgmBlob);
const pQmcBuf = KgmCryptoObj._malloc(DECRYPTION_BUF_SIZE);
KgmCryptoObj.writeArrayToMemory(kgmBuf.slice(0, DECRYPTION_BUF_SIZE), pQmcBuf);
const pKgmBuf = KgmCryptoObj._malloc(DECRYPTION_BUF_SIZE);
const preDecDataSize = Math.min(DECRYPTION_BUF_SIZE, kgmBlob.byteLength); // 初始化缓冲区大小
KgmCryptoObj.writeArrayToMemory(kgmBuf.slice(0, preDecDataSize), pKgmBuf);
// 进行解密初始化
const headerSize = KgmCryptoObj.preDec(pQmcBuf, DECRYPTION_BUF_SIZE, ext);
console.log(headerSize);
const headerSize = KgmCryptoObj.preDec(pKgmBuf, preDecDataSize, ext);
kgmBuf = kgmBuf.slice(headerSize);
const decryptedParts = [];
@ -52,14 +52,14 @@ export async function DecryptKgmWasm(kgmBlob: ArrayBuffer, ext: string): Promise
// 解密一些片段
const blockData = new Uint8Array(kgmBuf.slice(offset, offset + blockSize));
KgmCryptoObj.writeArrayToMemory(blockData, pQmcBuf);
KgmCryptoObj.decBlob(pQmcBuf, blockSize, offset);
decryptedParts.push(KgmCryptoObj.HEAPU8.slice(pQmcBuf, pQmcBuf + blockSize));
KgmCryptoObj.writeArrayToMemory(blockData, pKgmBuf);
KgmCryptoObj.decBlob(pKgmBuf, blockSize, offset);
decryptedParts.push(KgmCryptoObj.HEAPU8.slice(pKgmBuf, pKgmBuf + blockSize));
offset += blockSize;
bytesToDecrypt -= blockSize;
}
KgmCryptoObj._free(pQmcBuf);
KgmCryptoObj._free(pKgmBuf);
result.data = MergeUint8Array(decryptedParts);
result.success = true;

7
src/decrypt/qmc_wasm.ts
View File

@ -2,7 +2,7 @@ import { QmcCrypto } from '@xhacker/qmcwasm/QmcWasmBundle';
import QmcCryptoModule from '@xhacker/qmcwasm/QmcWasmBundle';
import { MergeUint8Array } from '@/utils/MergeUint8Array';
// 每次处理 2M 的数据
// 每次可以处理 2M 的数据
const DECRYPTION_BUF_SIZE = 2 *1024 * 1024;
export interface QMCDecryptionResult {
@ -38,11 +38,12 @@ export async function DecryptQmcWasm(qmcBlob: ArrayBuffer, ext: string): Promise
// 申请内存块，并文件末端数据到 WASM 的内存堆
const qmcBuf = new Uint8Array(qmcBlob);
const pQmcBuf = QmcCryptoObj._malloc(DECRYPTION_BUF_SIZE);
QmcCryptoObj.writeArrayToMemory(qmcBuf.slice(-DECRYPTION_BUF_SIZE), pQmcBuf);
const preDecDataSize = Math.min(DECRYPTION_BUF_SIZE, qmcBlob.byteLength); // 初始化缓冲区大小
QmcCryptoObj.writeArrayToMemory(qmcBuf.slice(-preDecDataSize), pQmcBuf);
// 进行解密初始化
ext = '.' + ext;
const tailSize = QmcCryptoObj.preDec(pQmcBuf, DECRYPTION_BUF_SIZE, ext);
const tailSize = QmcCryptoObj.preDec(pQmcBuf, preDecDataSize, ext);
if (tailSize == -1) {
result.error = QmcCryptoObj.getErr();
return result;