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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
#include <winapi/error.hpp>
#include <winapi/handle.hpp>
#include <winapi/shmem.hpp>
#include <winapi/utf8.hpp>
#include <winapi/utils.hpp>
#include <windows.h>
#include <cstddef>
#include <cstdint>
#include <string>
#include <utility>
namespace winapi {
namespace {
void* do_map(const Handle& mapping, std::size_t nb = 0) {
const auto addr = ::MapViewOfFile(static_cast<HANDLE>(mapping), FILE_MAP_ALL_ACCESS, 0, 0, nb);
if (addr == NULL) {
throw error::windows(GetLastError(), "MapViewOfFile");
}
return addr;
}
} // namespace
void SharedMemory::Unmap::operator()(void* ptr) const {
const auto ret = ::UnmapViewOfFile(ptr);
assert(ret);
WINAPI_UNUSED_PARAMETER(ret);
};
SharedMemory SharedMemory::create(const std::string& name, std::size_t nb) {
const auto nb64 = static_cast<std::uint64_t>(nb);
static_assert(sizeof(nb64) == 2 * sizeof(DWORD), "sizeof(DWORD) != 32");
const auto nb_low = static_cast<DWORD>(nb64);
const auto nb_high = static_cast<DWORD>(nb64 >> 32);
const auto mapping_impl = ::CreateFileMappingW(
INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, nb_high, nb_low, widen(name).c_str());
if (mapping_impl == NULL) {
throw error::windows(GetLastError(), "CreateFileMappingW");
}
Handle mapping{mapping_impl};
const auto addr = do_map(mapping);
return {std::move(mapping), addr};
}
SharedMemory SharedMemory::open(const std::string& name) {
const auto mapping_impl = ::OpenFileMappingW(FILE_MAP_ALL_ACCESS, FALSE, widen(name).c_str());
if (mapping_impl == NULL) {
throw error::windows(GetLastError(), "OpenFileMappingW");
}
Handle mapping{mapping_impl};
const auto addr = do_map(mapping);
return {std::move(mapping), addr};
}
} // namespace winapi
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