1 files changed, 112 insertions, 0 deletions

diff --git a/mtp/ffs/MtpFfsHandle.h b/mtp/ffs/MtpFfsHandle.h
new file mode 100644
index 000000000..20f74fa29
--- /dev/null
+++ b/mtp/ffs/MtpFfsHandle.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *		http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _MTP_FFS_HANDLE_H
+#define _MTP_FFS_HANDLE_H
+
+#include <android-base/unique_fd.h>
+#include <linux/aio_abi.h>
+#include <mutex>
+#include <sys/poll.h>
+#include <time.h>
+#include <thread>
+#include <vector>
+
+#include <IMtpHandle.h>
+
+constexpr int NUM_IO_BUFS = 2;
+
+struct io_buffer {
+	std::vector<struct iocb> iocbs;		// Holds memory for all iocbs. Not used directly.
+	std::vector<struct iocb*> iocb;		// Pointers to individual iocbs, for syscalls
+	std::vector<unsigned char> bufs;	// A large buffer, used with filesystem io
+	std::vector<unsigned char*> buf;	// Pointers within the larger buffer, for syscalls
+	unsigned actual;					// The number of buffers submitted for this request
+};
+
+template <class T> class MtpFfsHandleTest;
+
+class MtpFfsHandle : public IMtpHandle {
+	template <class T> friend class MtpFfsHandleTest;
+protected:
+	void closeConfig();
+	void closeEndpoints();
+	void advise(int fd);
+	int handleControlRequest(const struct usb_ctrlrequest *request);
+	int doAsync(void* data, size_t len, bool read, bool zero_packet);
+	int handleEvent();
+	void cancelTransaction();
+	void doSendEvent(mtp_event me);
+	bool openEndpoints(bool ptp);
+
+	static int getPacketSize(int ffs_fd);
+
+	bool mCanceled;
+
+	android::base::unique_fd mControl;
+	// "in" from the host's perspective => sink for mtp server
+	android::base::unique_fd mBulkIn;
+	// "out" from the host's perspective => source for mtp server
+	android::base::unique_fd mBulkOut;
+	android::base::unique_fd mIntr;
+
+	aio_context_t mCtx;
+
+	android::base::unique_fd mEventFd;
+	struct pollfd mPollFds[2];
+
+	struct io_buffer mIobuf[NUM_IO_BUFS];
+
+	// Submit an io request of given length. Return amount submitted or -1.
+	int iobufSubmit(struct io_buffer *buf, int fd, unsigned length, bool read);
+
+	// Cancel submitted requests from start to end in the given array. Return 0 or -1.
+	int cancelEvents(struct iocb **iocb, struct io_event *events, unsigned start, unsigned end);
+
+	// Wait for at minimum the given number of events. Returns the amount of data in the returned
+	// events. Increments counter by the number of events returned.
+	int waitEvents(struct io_buffer *buf, int min_events, struct io_event *events, int *counter);
+
+public:
+	int read(void *data, size_t len) override;
+	int write(const void *data, size_t len) override;
+
+	int receiveFile(mtp_file_range mfr, bool zero_packet) override;
+	int sendFile(mtp_file_range mfr) override;
+	int sendEvent(mtp_event me) override;
+
+	int start(bool ptp) override;
+	void close() override;
+
+	bool writeDescriptors(bool ptp);
+
+	MtpFfsHandle(int controlFd);
+	~MtpFfsHandle();
+};
+
+struct mtp_data_header {
+	/* length of packet, including this header */
+	__le32 length;
+	/* container type (2 for data packet) */
+	__le16 type;
+	/* MTP command code */
+	__le16 command;
+	/* MTP transaction ID */
+	__le32 transaction_id;
+};
+
+#endif // _MTP_FFS_HANDLE_H
+