godot/drivers/windows/file_access_windows_pipe.cpp

/**************************************************************************/
/*  file_access_windows_pipe.cpp                                          */
/**************************************************************************/
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#ifdef WINDOWS_ENABLED

#include "file_access_windows_pipe.h"

#include "core/os/os.h"
#include "core/string/print_string.h"

Error FileAccessWindowsPipe::open_existing(HANDLE p_rfd, HANDLE p_wfd, bool p_blocking) {
	// Open pipe using handles created by CreatePipe(rfd, wfd, NULL, 4096) call in the OS.execute_with_pipe.
	_close();

	path_src = String();
	ERR_FAIL_COND_V_MSG(fd[0] != 0 || fd[1] != 0, ERR_ALREADY_IN_USE, "Pipe is already in use.");
	fd[0] = p_rfd;
	fd[1] = p_wfd;

	if (!p_blocking) {
		DWORD mode = PIPE_READMODE_BYTE | PIPE_NOWAIT;
		SetNamedPipeHandleState(fd[0], &mode, nullptr, nullptr);
		SetNamedPipeHandleState(fd[1], &mode, nullptr, nullptr);
	}

	last_error = OK;
	return OK;
}

Error FileAccessWindowsPipe::open_internal(const String &p_path, int p_mode_flags) {
	_close();

	path_src = p_path;
	ERR_FAIL_COND_V_MSG(fd[0] != 0 || fd[1] != 0, ERR_ALREADY_IN_USE, "Pipe is already in use.");

	path = String("\\\\.\\pipe\\LOCAL\\") + p_path.replace("pipe://", "").replace("/", "_");

	HANDLE h = CreateFileW((LPCWSTR)path.utf16().get_data(), GENERIC_READ | GENERIC_WRITE, 0, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (h == INVALID_HANDLE_VALUE) {
		h = CreateNamedPipeW((LPCWSTR)path.utf16().get_data(), PIPE_ACCESS_DUPLEX, PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_NOWAIT, 1, 4096, 4096, 0, nullptr);
		if (h == INVALID_HANDLE_VALUE) {
			last_error = ERR_FILE_CANT_OPEN;
			return last_error;
		}
		ConnectNamedPipe(h, NULL);
	}
	fd[0] = h;
	fd[1] = h;

	last_error = OK;
	return OK;
}

void FileAccessWindowsPipe::_close() {
	if (fd[0] == 0) {
		return;
	}
	if (fd[1] != fd[0]) {
		CloseHandle(fd[1]);
	}
	CloseHandle(fd[0]);
	fd[0] = 0;
	fd[1] = 0;
}

bool FileAccessWindowsPipe::is_open() const {
	return (fd[0] != 0 || fd[1] != 0);
}

String FileAccessWindowsPipe::get_path() const {
	return path_src;
}

String FileAccessWindowsPipe::get_path_absolute() const {
	return path_src;
}

uint64_t FileAccessWindowsPipe::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
	ERR_FAIL_COND_V_MSG(fd[0] == 0, -1, "Pipe must be opened before use.");
	ERR_FAIL_COND_V(!p_dst && p_length > 0, -1);

	DWORD read = 0;
	if (!ReadFile(fd[0], p_dst, p_length, &read, nullptr) || read != p_length) {
		last_error = ERR_FILE_CANT_READ;
	} else {
		last_error = OK;
	}
	return read;
}

Error FileAccessWindowsPipe::get_error() const {
	return last_error;
}

void FileAccessWindowsPipe::store_buffer(const uint8_t *p_src, uint64_t p_length) {
	ERR_FAIL_COND_MSG(fd[1] == 0, "Pipe must be opened before use.");
	ERR_FAIL_COND(!p_src && p_length > 0);

	DWORD read = -1;
	bool ok = WriteFile(fd[1], p_src, p_length, &read, nullptr);
	if (!ok || read != p_length) {
		last_error = ERR_FILE_CANT_WRITE;
	} else {
		last_error = OK;
	}
}

void FileAccessWindowsPipe::close() {
	_close();
}

FileAccessWindowsPipe::~FileAccessWindowsPipe() {
	_close();
}

#endif // WINDOWS_ENABLED