5bf0b34445
C++17ification! - Filesystem interaction now uses std::filesystem::path. - Usage of const char*, std::string have been changed to std::string_view where appropriate. - Usage of printf-style functions changed to use fmt.
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2020 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_BASE_MAPPED_MEMORY_H_
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#define XENIA_BASE_MAPPED_MEMORY_H_
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#include <filesystem>
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#include <memory>
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#include <string>
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namespace xe {
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class MappedMemory {
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public:
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enum class Mode {
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kRead,
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kReadWrite,
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};
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static std::unique_ptr<MappedMemory> Open(const std::filesystem::path& path,
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Mode mode, size_t offset = 0,
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size_t length = 0);
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MappedMemory(const std::filesystem::path& path, Mode mode)
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: path_(path), mode_(mode), data_(nullptr), size_(0) {}
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MappedMemory(const std::filesystem::path& path, Mode mode, void* data,
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size_t size)
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: path_(path), mode_(mode), data_(data), size_(size) {}
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virtual ~MappedMemory() = default;
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std::unique_ptr<MappedMemory> Slice(Mode mode, size_t offset, size_t length) {
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return std::unique_ptr<MappedMemory>(
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new MappedMemory(path_, mode, data() + offset, length));
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}
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uint8_t* data() const { return reinterpret_cast<uint8_t*>(data_); }
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size_t size() const { return size_; }
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// Close, and optionally truncate file to size
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virtual void Close(uint64_t truncate_size = 0) {}
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virtual void Flush() {}
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// Changes the offset inside the file. This will update data() and size()!
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virtual bool Remap(size_t offset, size_t length) { return false; }
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protected:
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std::filesystem::path path_;
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Mode mode_;
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void* data_;
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size_t size_;
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};
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class ChunkedMappedMemoryWriter {
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public:
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virtual ~ChunkedMappedMemoryWriter() = default;
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static std::unique_ptr<ChunkedMappedMemoryWriter> Open(
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const std::filesystem::path& path, size_t chunk_size,
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bool low_address_space = false);
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virtual uint8_t* Allocate(size_t length) = 0;
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virtual void Flush() = 0;
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virtual void FlushNew() = 0;
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protected:
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ChunkedMappedMemoryWriter(const std::filesystem::path& path,
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size_t chunk_size, bool low_address_space)
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: path_(path),
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chunk_size_(chunk_size),
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low_address_space_(low_address_space) {}
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std::filesystem::path path_;
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size_t chunk_size_;
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bool low_address_space_;
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};
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} // namespace xe
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#endif // XENIA_BASE_MAPPED_MEMORY_H_
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