added iOS source code

[wl-app.git] / iOS / Pods / Realm / include / core / realm / util / file_mapper.hpp

diff --git a/iOS/Pods/Realm/include/core/realm/util/file_mapper.hpp b/iOS/Pods/Realm/include/core/realm/util/file_mapper.hpp
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+/*************************************************************************
+ *
+ * Copyright 2016 Realm Inc.
+ *
+ * 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 REALM_UTIL_FILE_MAPPER_HPP
+#define REALM_UTIL_FILE_MAPPER_HPP
+
+#include <realm/util/file.hpp>
+#include <realm/utilities.hpp>
+#include <realm/util/thread.hpp>
+#include <realm/util/encrypted_file_mapping.hpp>
+
+namespace realm {
+namespace util {
+
+void* mmap(FileDesc fd, size_t size, File::AccessMode access, size_t offset, const char* encryption_key);
+void munmap(void* addr, size_t size) noexcept;
+void* mremap(FileDesc fd, size_t file_offset, void* old_addr, size_t old_size, File::AccessMode a, size_t new_size,
+             const char* encryption_key);
+void msync(FileDesc fd, void* addr, size_t size);
+
+// A function which may be given to encryption_read_barrier. If present, the read barrier is a
+// a barrier for a full array. If absent, the read barrier is a barrier only for the address
+// range give as argument. If the barrier is for a full array, it will read the array header
+// and determine the address range from the header.
+using HeaderToSize = size_t (*)(const char* addr);
+class EncryptedFileMapping;
+
+#if REALM_ENABLE_ENCRYPTION
+
+
+// This variant allows the caller to obtain direct access to the encrypted file mapping
+// for optimization purposes.
+void* mmap(FileDesc fd, size_t size, File::AccessMode access, size_t offset, const char* encryption_key,
+           EncryptedFileMapping*& mapping);
+
+void do_encryption_read_barrier(const void* addr, size_t size, HeaderToSize header_to_size,
+                                EncryptedFileMapping* mapping);
+
+void do_encryption_write_barrier(const void* addr, size_t size, EncryptedFileMapping* mapping);
+
+void inline encryption_read_barrier(const void* addr, size_t size, EncryptedFileMapping* mapping,
+                                    HeaderToSize header_to_size = nullptr)
+{
+    if (mapping)
+        do_encryption_read_barrier(addr, size, header_to_size, mapping);
+}
+
+void inline encryption_write_barrier(const void* addr, size_t size, EncryptedFileMapping* mapping)
+{
+    if (mapping)
+        do_encryption_write_barrier(addr, size, mapping);
+}
+
+
+extern util::Mutex& mapping_mutex;
+
+inline void do_encryption_read_barrier(const void* addr, size_t size, HeaderToSize header_to_size,
+                                       EncryptedFileMapping* mapping)
+{
+    UniqueLock lock(mapping_mutex, defer_lock_tag());
+    mapping->read_barrier(addr, size, lock, header_to_size);
+}
+
+inline void do_encryption_write_barrier(const void* addr, size_t size, EncryptedFileMapping* mapping)
+{
+    LockGuard lock(mapping_mutex);
+    mapping->write_barrier(addr, size);
+}
+
+
+#else
+void inline encryption_read_barrier(const void*, size_t, EncryptedFileMapping*, HeaderToSize header_to_size = nullptr)
+{
+    static_cast<void>(header_to_size);
+}
+void inline encryption_write_barrier(const void*, size_t)
+{
+}
+void inline encryption_write_barrier(const void*, size_t, EncryptedFileMapping*)
+{
+}
+#endif
+
+// helpers for encrypted Maps
+template <typename T>
+void encryption_read_barrier(File::Map<T>& map, size_t index, size_t num_elements = 1)
+{
+    T* addr = map.get_addr();
+    encryption_read_barrier(addr + index, sizeof(T) * num_elements, map.get_encrypted_mapping());
+}
+
+template <typename T>
+void encryption_write_barrier(File::Map<T>& map, size_t index, size_t num_elements = 1)
+{
+    T* addr = map.get_addr();
+    encryption_write_barrier(addr + index, sizeof(T) * num_elements, map.get_encrypted_mapping());
+}
+
+File::SizeType encrypted_size_to_data_size(File::SizeType size) noexcept;
+File::SizeType data_size_to_encrypted_size(File::SizeType size) noexcept;
+
+size_t round_up_to_page_size(size_t size) noexcept;
+}
+}
+#endif