donut snapshot
diff --git a/include/utils/BackupHelpers.h b/include/utils/BackupHelpers.h
new file mode 100644
index 0000000..b1f5045
--- /dev/null
+++ b/include/utils/BackupHelpers.h
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2009 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 _UTILS_BACKUP_HELPERS_H
+#define _UTILS_BACKUP_HELPERS_H
+
+#include <utils/Errors.h>
+#include <utils/String8.h>
+#include <utils/KeyedVector.h>
+
+namespace android {
+
+enum {
+ BACKUP_HEADER_ENTITY_V1 = 0x61746144, // Data (little endian)
+};
+
+typedef struct {
+ int type; // BACKUP_HEADER_ENTITY_V1
+ int keyLen; // length of the key name, not including the null terminator
+ int dataSize; // size of the data, not including the padding, -1 means delete
+} entity_header_v1;
+
+struct SnapshotHeader {
+ int magic0;
+ int fileCount;
+ int magic1;
+ int totalSize;
+};
+
+struct FileState {
+ int modTime_sec;
+ int modTime_nsec;
+ int mode;
+ int size;
+ int crc32;
+ int nameLen;
+};
+
+struct FileRec {
+ String8 file;
+ bool deleted;
+ FileState s;
+};
+
+
+/**
+ * Writes the data.
+ *
+ * If an error occurs, it poisons this object and all write calls will fail
+ * with the error that occurred.
+ */
+class BackupDataWriter
+{
+public:
+ BackupDataWriter(int fd);
+ // does not close fd
+ ~BackupDataWriter();
+
+ status_t WriteEntityHeader(const String8& key, size_t dataSize);
+ status_t WriteEntityData(const void* data, size_t size);
+
+ void SetKeyPrefix(const String8& keyPrefix);
+
+private:
+ explicit BackupDataWriter();
+ status_t write_padding_for(int n);
+
+ int m_fd;
+ status_t m_status;
+ ssize_t m_pos;
+ int m_entityCount;
+ String8 m_keyPrefix;
+};
+
+/**
+ * Reads the data.
+ *
+ * If an error occurs, it poisons this object and all write calls will fail
+ * with the error that occurred.
+ */
+class BackupDataReader
+{
+public:
+ BackupDataReader(int fd);
+ // does not close fd
+ ~BackupDataReader();
+
+ status_t Status();
+ status_t ReadNextHeader(bool* done, int* type);
+
+ bool HasEntities();
+ status_t ReadEntityHeader(String8* key, size_t* dataSize);
+ status_t SkipEntityData(); // must be called with the pointer at the begining of the data.
+ ssize_t ReadEntityData(void* data, size_t size);
+
+private:
+ explicit BackupDataReader();
+ status_t skip_padding();
+
+ int m_fd;
+ bool m_done;
+ status_t m_status;
+ ssize_t m_pos;
+ ssize_t m_dataEndPos;
+ int m_entityCount;
+ union {
+ int type;
+ entity_header_v1 entity;
+ } m_header;
+ String8 m_key;
+};
+
+int back_up_files(int oldSnapshotFD, BackupDataWriter* dataStream, int newSnapshotFD,
+ char const* const* files, char const* const *keys, int fileCount);
+
+class RestoreHelperBase
+{
+public:
+ RestoreHelperBase();
+ ~RestoreHelperBase();
+
+ status_t WriteFile(const String8& filename, BackupDataReader* in);
+ status_t WriteSnapshot(int fd);
+
+private:
+ void* m_buf;
+ bool m_loggedUnknownMetadata;
+ KeyedVector<String8,FileRec> m_files;
+};
+
+#define TEST_BACKUP_HELPERS 1
+
+#if TEST_BACKUP_HELPERS
+int backup_helper_test_empty();
+int backup_helper_test_four();
+int backup_helper_test_files();
+int backup_helper_test_null_base();
+int backup_helper_test_missing_file();
+int backup_helper_test_data_writer();
+int backup_helper_test_data_reader();
+#endif
+
+} // namespace android
+
+#endif // _UTILS_BACKUP_HELPERS_H