From af32bb9c4f4f06e92de3435ed2db3153c0701094 Mon Sep 17 00:00:00 2001
From: bigbiff bigbiff <bigbiff@teamw.in>
Date: Tue, 18 Dec 2018 18:39:53 -0500
Subject: MTP FFS updates:

This update splits old MTP code and new MTP code from Google
into two trees, legacy and ffs. Depending on the SDK level,
the build system will select the correct version. The reason
for separating the versions out are due to older android trees
not supporting the updated MTP code from Google.

Most MTP code is from Google, with additions needed from
implementing the Java functions in C++ for TWRP and FFS.

We assume if you are in android-9.0 or above, your kernel
has support for FFS over MTP. Verify that your init.rc
is mounting the MTP FFS driver to the proper location.

Change-Id: I4b107b239bd9bc5699527f9c8c77d9079f264a7e
---
 mtp/ffs/MtpRequestPacket.cpp | 71 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 mtp/ffs/MtpRequestPacket.cpp

(limited to 'mtp/ffs/MtpRequestPacket.cpp')

diff --git a/mtp/ffs/MtpRequestPacket.cpp b/mtp/ffs/MtpRequestPacket.cpp
new file mode 100644
index 000000000..8ef1f3c3d
--- /dev/null
+++ b/mtp/ffs/MtpRequestPacket.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+#define LOG_TAG "MtpRequestPacket"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include "IMtpHandle.h"
+#include "MtpDebug.h"
+#include "MtpRequestPacket.h"
+
+#include <usbhost/usbhost.h>
+
+MtpRequestPacket::MtpRequestPacket()
+	:	MtpPacket(512),
+		mParameterCount(0)
+{
+}
+
+MtpRequestPacket::~MtpRequestPacket() {
+}
+
+#ifdef MTP_DEVICE
+int MtpRequestPacket::read(IMtpHandle *h) {
+	int ret = h->read(mBuffer, mBufferSize);
+	if (ret < 0) {
+		// file read error
+		return ret;
+	}
+
+	// request packet should have 12 byte header followed by 0 to 5 32-bit arguments
+	const size_t read_size = static_cast<size_t>(ret);
+	if (read_size >= MTP_CONTAINER_HEADER_SIZE
+			&& read_size <= MTP_CONTAINER_HEADER_SIZE + 5 * sizeof(uint32_t)
+			&& ((read_size - MTP_CONTAINER_HEADER_SIZE) & 3) == 0) {
+		mPacketSize = read_size;
+		mParameterCount = (read_size - MTP_CONTAINER_HEADER_SIZE) / sizeof(uint32_t);
+	} else {
+		MTPE("Malformed MTP request packet");
+		ret = -1;
+	}
+	return ret;
+}
+#endif
+
+#ifdef MTP_HOST
+	// write our buffer to the given endpoint (host mode)
+int MtpRequestPacket::write(struct usb_request *request)
+{
+	putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
+	putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_COMMAND);
+	request->buffer = mBuffer;
+	request->buffer_length = mPacketSize;
+	return transfer(request);
+}
+#endif
-- 
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