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#include "cru/base/platform/win/Stream.h"
#include "BrigdeComStream.h"
#include "cru/base/StringUtil.h"
#include "cru/base/io/Base.h"
#include "cru/base/io/MemoryStream.h"
#include "cru/base/platform/win/ComAutoInit.h"
#include <Windows.h>
#include <coml2api.h>
#include <errhandlingapi.h>
#include <fileapi.h>
#include <handleapi.h>
#include <shlwapi.h>
#include <winnt.h>
#include <filesystem>
#include <format>
namespace cru::platform::win {
using namespace cru::io;
namespace {
HANDLE OpenHandle(std::string_view path, OpenFileFlag flags) {
DWORD access = 0;
DWORD creation_disposition = 0;
if (flags & OpenFileFlags::Read) {
access |= GENERIC_READ;
} else {
access |= GENERIC_WRITE;
}
if (std::filesystem::exists(path)) {
creation_disposition =
flags & io::OpenFileFlags::Truncate ? TRUNCATE_EXISTING : OPEN_EXISTING;
} else {
if (!flags.Has(OpenFileFlags::Create)) {
throw FileNotExistException(std::format("File {} does not exist.", path));
} else {
creation_disposition = CREATE_NEW;
}
}
IStream* stream;
auto handle =
::CreateFileW(cru::string::ToUtf16(path).c_str(), access, 0, nullptr,
creation_disposition, FILE_ATTRIBUTE_NORMAL, nullptr);
if (handle == INVALID_HANDLE_VALUE) {
throw Win32Error("Failed to call CreateFileW.");
}
if (flags.Has(OpenFileFlags::Append)) {
LARGE_INTEGER offset;
offset.QuadPart = 0;
CheckWinReturn(::SetFilePointerEx(handle, offset, nullptr, FILE_END));
}
return handle;
}
} // namespace
Win32HandleStream::Win32HandleStream(std::string_view path, OpenFileFlag flags)
: Win32HandleStream(OpenHandle(path, flags), true, true,
flags.Has(OpenFileFlags::Read),
flags.Has(OpenFileFlags::Write)) {}
Win32HandleStream::Win32HandleStream(HANDLE handle, bool auto_close,
bool can_seek, bool can_read,
bool can_write)
: Win32HandleStream(Win32Handle(handle, auto_close), can_seek, can_read,
can_write) {}
Win32HandleStream::Win32HandleStream(Win32Handle&& handle, bool can_seek,
bool can_read, bool can_write)
: Stream(SupportedOperations(can_seek, can_read, can_write)),
handle_(std::move(handle)) {}
Win32HandleStream::~Win32HandleStream() { DoClose(); }
Index Win32HandleStream::DoSeek(Index offset, SeekOrigin origin) {
DWORD method = 0;
if (origin == SeekOrigin::Current) {
method = FILE_CURRENT;
} else if (origin == SeekOrigin::End) {
method = FILE_END;
} else {
method = FILE_BEGIN;
}
LARGE_INTEGER n_offset, new_pos;
n_offset.QuadPart = offset;
CheckWinReturn(::SetFilePointerEx(handle_.Get(), n_offset, &new_pos, method));
return new_pos.QuadPart;
}
Index Win32HandleStream::DoRead(std::byte* buffer, Index offset, Index size) {
DWORD real_read;
auto r = ::ReadFile(handle_.Get(), static_cast<LPVOID>(buffer + offset), size,
&real_read, nullptr);
if (r == FALSE) {
auto e = ::GetLastError();
if (e != ERROR_BROKEN_PIPE || e != ERROR_BROKEN_PIPE) {
throw Win32Error(e, "Failed to call ReadFile.");
}
}
return real_read;
}
Index Win32HandleStream::DoWrite(const std::byte* buffer, Index offset,
Index size) {
DWORD real_write;
CheckWinReturn(::WriteFile(handle_.Get(),
static_cast<LPCVOID>(buffer + offset), size,
&real_write, nullptr));
return real_write;
}
void Win32HandleStream::DoClose() {
CRU_STREAM_BEGIN_CLOSE
handle_ = {};
}
IStream* ToComStream(io::Stream* stream) {
static ComAutoInit com_auto_init;
if (auto memory_stream = dynamic_cast<io::MemoryStream*>(stream)) {
return SHCreateMemStream(
reinterpret_cast<const BYTE*>(memory_stream->GetBuffer()),
memory_stream->GetSize());
} else if (auto file_stream = dynamic_cast<ComStream*>(stream)) {
return file_stream->GetComStream();
} else {
return new BridgeComStream(stream);
}
}
namespace {
IStream* OpenComStream(std::string_view path, OpenFileFlag flags) {
DWORD grfMode = STGM_SHARE_DENY_NONE;
if (flags & io::OpenFileFlags::Read) {
if (flags & io::OpenFileFlags::Write) {
grfMode |= STGM_READWRITE;
} else {
grfMode |= STGM_READ;
}
} else {
if (flags & io::OpenFileFlags::Write) {
grfMode |= STGM_WRITE;
} else {
throw Exception("Stream must be readable or writable.");
}
}
if (flags & io::OpenFileFlags::Truncate) {
grfMode |= STGM_CREATE;
}
IStream* stream;
CheckHResult(SHCreateStreamOnFileEx(
cru::string::ToUtf16(path).c_str(), grfMode, FILE_ATTRIBUTE_NORMAL,
flags & io::OpenFileFlags::Create ? TRUE : FALSE, NULL, &stream));
return stream;
}
} // namespace
ComStream::ComStream(std::string_view path, OpenFileFlag flags)
: ComStream(OpenComStream(path, flags), true, true,
flags.Has(OpenFileFlags::Read),
flags.Has(OpenFileFlags::Write)) {}
ComStream::ComStream(IStream* com_stream, bool auto_release, bool can_seek,
bool can_read, bool can_write)
: Stream(SupportedOperations(can_seek, can_read, can_write)),
stream_(com_stream),
auto_release_(auto_release) {}
ComStream::~ComStream() { DoClose(); }
Index ComStream::DoSeek(Index offset, SeekOrigin origin) {
DWORD dwOrigin = 0;
if (origin == SeekOrigin::Current) {
dwOrigin = STREAM_SEEK_CUR;
} else if (origin == SeekOrigin::End) {
dwOrigin = STREAM_SEEK_END;
} else {
dwOrigin = STREAM_SEEK_SET;
}
LARGE_INTEGER n_offset;
n_offset.QuadPart = offset;
ULARGE_INTEGER n_new_offset;
CheckHResult(stream_->Seek(n_offset, dwOrigin, &n_new_offset));
return n_new_offset.QuadPart;
}
Index ComStream::DoRead(std::byte* buffer, Index offset, Index size) {
ULONG n_read;
CheckHResult(stream_->Read(buffer + offset, size, &n_read));
return n_read;
}
Index ComStream::DoWrite(const std::byte* buffer, Index offset, Index size) {
if (size < 0) {
throw Exception("Size must be greater than 0.");
}
ULONG n_written;
CheckHResult(stream_->Write(buffer + offset, size, &n_written));
return n_written;
}
void ComStream::DoClose() {
CRU_STREAM_BEGIN_CLOSE
if (stream_ && auto_release_) {
stream_->Release();
stream_ = nullptr;
}
}
} // namespace cru::platform::win
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