add experimental disk corrupt detech on Android/Linux

Core/MemoryFile_Linux.cpp

@@ -123,6 +123,31 @@ bool copyFileContent(const MMKVPath_t &srcPath, MMKVFileHandle_t dstFD, bool nee
     return ret;
 }
 
+bool isDiskOfMMAPFileCorrupted(MemoryFile *file, bool &needReportReadFail) {
+    // TODO: maybe we need reading a larger chunk than 4 byte in Android/Linux
+    uint32_t info;
+    auto fd = file->getFd();
+    auto path = file->getPath().c_str();
+
+    auto oldPos = lseek(fd, 0, SEEK_CUR);
+    lseek(fd, 0, SEEK_SET);
+    auto size = read(fd, &info, sizeof(info));
+    auto err = errno;
+    lseek(fd, oldPos, SEEK_SET);
+
+    if (size <= 0) {
+        needReportReadFail = true;
+        MMKVError("fail to read [%s] from fd [%d], errno: %d (%s)", path, fd, err, strerror(err));
+        if (err == EIO || err == EILSEQ || err == EINVAL || err == ENXIO) {
+            MMKVWarning("file fail to read, consider it illegal, delete now: [%s]", path);
+            return true;
+        }
+    }
+    // we don't rollout mayfly fd (yet)
+    // file->cleanMayflyFD();
+    return false;
+}
+
 } // namespace mmkv
 
 #endif // defined(MMKV_ANDROID) || defined(MMKV_LINUX)