upload android base code part6

android/system/libvintf/utils.h

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_VINTF_UTILS_H
+#define ANDROID_VINTF_UTILS_H
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+#include <android-base/logging.h>
+#include <utils/Errors.h>
+
+#include "parse_xml.h"
+
+namespace android {
+namespace vintf {
+namespace details {
+
+// Return the file from the given location as a string.
+//
+// This class can be used to create a mock for overriding.
+class FileFetcher {
+   public:
+    virtual ~FileFetcher() {}
+    virtual status_t fetch(const std::string& path, std::string& fetched) {
+        std::ifstream in;
+
+        in.open(path);
+        if (!in.is_open()) {
+            LOG(WARNING) << "Cannot open " << path;
+            return INVALID_OPERATION;
+        }
+
+        std::stringstream ss;
+        ss << in.rdbuf();
+        fetched = ss.str();
+
+        return OK;
+    }
+};
+
+extern FileFetcher* gFetcher;
+
+class PartitionMounter {
+   public:
+    virtual ~PartitionMounter() {}
+    virtual status_t mountSystem() const { return OK; }
+    virtual status_t mountVendor() const { return OK; }
+    virtual status_t umountSystem() const { return OK; }
+    virtual status_t umountVendor() const { return OK; }
+};
+
+extern PartitionMounter* gPartitionMounter;
+
+template <typename T>
+status_t fetchAllInformation(const std::string& path, const XmlConverter<T>& converter,
+                             T* outObject) {
+    std::string info;
+
+    if (gFetcher == nullptr) {
+        // Should never happen.
+        return NO_INIT;
+    }
+
+    status_t result = gFetcher->fetch(path, info);
+
+    if (result != OK) {
+        return result;
+    }
+
+    bool success = converter(outObject, info);
+    if (!success) {
+        LOG(ERROR) << "Illformed file: " << path << ": "
+                   << converter.lastError();
+        return BAD_VALUE;
+    }
+    return OK;
+}
+
+}  // namespace details
+}  // namespace vintf
+}  // namespace android
+
+
+
+#endif