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.
87 lines
2.1 KiB
C++
87 lines
2.1 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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#include "xenia/base/mapped_memory.h"
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#include <sys/mman.h>
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#include <cstdio>
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#include <memory>
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#include "xenia/base/string.h"
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namespace xe {
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class PosixMappedMemory : public MappedMemory {
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public:
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PosixMappedMemory(const std::filesystem::path& path, Mode mode)
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: MappedMemory(path, mode), file_handle(nullptr) {}
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~PosixMappedMemory() override {
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if (data_) {
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munmap(data_, size_);
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}
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if (file_handle) {
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fclose(file_handle);
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}
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}
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FILE* file_handle;
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};
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std::unique_ptr<MappedMemory> MappedMemory::Open(
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const std::filesystem::path& path, Mode mode, size_t offset,
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size_t length) {
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const char* mode_str;
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int prot;
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switch (mode) {
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case Mode::kRead:
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mode_str = "rb";
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prot = PROT_READ;
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break;
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case Mode::kReadWrite:
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mode_str = "r+b";
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prot = PROT_READ | PROT_WRITE;
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break;
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}
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auto mm =
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std::unique_ptr<PosixMappedMemory>(new PosixMappedMemory(path, mode));
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mm->file_handle = fopen(path.c_str(), mode_str);
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if (!mm->file_handle) {
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return nullptr;
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}
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size_t map_length;
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map_length = length;
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if (!length) {
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fseeko(mm->file_handle, 0, SEEK_END);
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map_length = ftello(mm->file_handle);
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fseeko(mm->file_handle, 0, SEEK_SET);
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}
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mm->size_ = map_length;
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mm->data_ =
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mmap(0, map_length, prot, MAP_SHARED, fileno(mm->file_handle), offset);
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if (!mm->data_) {
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return nullptr;
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}
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return std::move(mm);
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}
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std::unique_ptr<ChunkedMappedMemoryWriter> ChunkedMappedMemoryWriter::Open(
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const std::filesystem::path& path, size_t chunk_size,
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bool low_address_space) {
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// TODO(DrChat)
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return nullptr;
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}
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} // namespace xe
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