refactor: remove suppressed qmc mask methods / constants

(cherry picked from commit 5d48b28a949cbd42f24781a69124d7aa521e51c1)

src/decrypt/qmcMask.ts

@@ -1,31 +1,3 @@
-import {BytesHasPrefix, FLAC_HEADER, OGG_HEADER} from "@/decrypt/utils";
-
-const QMOggPublicHeader1 = [
-    0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x1e, 0x01, 0x76, 0x6f, 0x72,
-    0x62, 0x69, 0x73, 0x00, 0x00, 0x00, 0x00, 0x02, 0x44, 0xac, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x00, 0xee, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x01, 0x4f, 0x67, 0x67, 0x53, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00,
-    0xff, 0xff, 0xff, 0xff];
-const QMOggPublicHeader2 = [
-    0x03, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x2c, 0x00, 0x00, 0x00, 0x58, 0x69, 0x70, 0x68, 0x2e,
-    0x4f, 0x72, 0x67, 0x20, 0x6c, 0x69, 0x62, 0x56, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x20, 0x49, 0x20,
-    0x32, 0x30, 0x31, 0x35, 0x30, 0x31, 0x30, 0x35, 0x20, 0x28, 0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84,
-    0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84, 0x29, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x54,
-    0x49, 0x54, 0x4c, 0x45, 0x3d];
-const QMOggPublicConf1 = [
-    9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 0, 0,
-    0, 0, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9, 9, 9,
-    9, 9, 9, 9, 9, 9, 9, 6, 3, 3, 3, 3, 6, 6, 6, 6,
-    3, 3, 3, 3, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 9, 9,
-    9, 9, 9, 9, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9,
-    0, 0, 0, 0];
-const QMOggPublicConf2 = [
-    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-    3, 3, 3, 3, 3, 3, 3, 0, 1, 3, 3, 0, 1, 3, 3, 3,
-    3, 3, 3, 3, 3];
 const QMCDefaultMaskMatrix = [
     0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
     0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
@@ -34,7 +6,6 @@ const QMCDefaultMaskMatrix = [
     0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
     0xf9, 0xbc, 0x00, 0x11];
 
-
 const AllMapping: number[][] = [];
 const Mask128to44: number[] = [];
 
@@ -57,7 +28,6 @@ const Mask128to44: number[] = [];
     })
 })();
 
-
 export class QmcMask {
     private readonly Matrix128: number[];
 
@@ -126,81 +96,3 @@ export class QmcMask {
 export function QmcMaskGetDefault() {
     return new QmcMask(QMCDefaultMaskMatrix)
 }
-
-export function QmcMaskDetectMflac(data: Uint8Array) {
-    let search_len = Math.min(0x8000, data.length)
-    for (let block_idx = 0; block_idx < search_len; block_idx += 128) {
-        try {
-            let mask = new QmcMask(data.slice(block_idx, block_idx + 128));
-            if (BytesHasPrefix(mask.Decrypt(data.slice(0, FLAC_HEADER.length)), FLAC_HEADER)) {
-                return mask
-            }
-        } catch (e) {
-        }
-    }
-    return
-}
-
-export function QmcMaskDetectMgg(data: Uint8Array) {
-    if (data.length < 0x100) return
-    let matrixConfidence: { [key: number]: { [key: number]: number } } = {};
-    for (let i = 0; i < 44; i++) matrixConfidence[i] = {};
-
-    const page2 = data[0x54] ^ data[0xC] ^ QMOggPublicHeader1[0xC];
-    const spHeader = QmcGenerateOggHeader(page2)
-    const spConf = QmcGenerateOggConf(page2)
-
-    for (let idx128 = 0; idx128 < spHeader.length; idx128++) {
-        if (spConf[idx128] === 0) continue;
-        let idx44 = Mask128to44[idx128 % 128];
-        let _m = data[idx128] ^ spHeader[idx128]
-        let confidence = spConf[idx128];
-        if (_m in matrixConfidence[idx44]) {
-            matrixConfidence[idx44][_m] += confidence
-        } else {
-            matrixConfidence[idx44][_m] = confidence
-        }
-    }
-    let matrix = [];
-    try {
-        for (let i = 0; i < 44; i++)
-            matrix[i] = calcMaskFromConfidence(matrixConfidence[i]);
-    } catch (e) {
-        return
-    }
-    const mask = new QmcMask(matrix);
-    if (BytesHasPrefix(mask.Decrypt(data.slice(0, OGG_HEADER.length)), OGG_HEADER)) {
-        return mask
-    }
-    return
-}
-
-
-function calcMaskFromConfidence(confidence: { [key: number]: number }) {
-    const count = Object.keys(confidence).length
-    if (count === 0) throw "can not match at least one key";
-    if (count > 1) console.warn("There are 2 potential value for the mask!")
-    let result = ""
-    let conf = 0
-    for (let idx in confidence) {
-        if (confidence[idx] > conf) {
-            result = idx;
-            conf = confidence[idx];
-        }
-    }
-    return Number(result)
-}
-
-function QmcGenerateOggHeader(page2: number) {
-    let spec = [page2, 0xFF]
-    for (let i = 2; i < page2; i++) spec.push(0xFF)
-    spec.push(0xFF)
-    return QMOggPublicHeader1.concat(spec, QMOggPublicHeader2)
-}
-
-function QmcGenerateOggConf(page2: number) {
-    let specConf = [6, 0]
-    for (let i = 2; i < page2; i++) specConf.push(4)
-    specConf.push(0)
-    return QMOggPublicConf1.concat(specConf, QMOggPublicConf2)
-}