1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.server.usb.descriptors; 17 18 import android.hardware.usb.UsbDeviceConnection; 19 import android.util.Log; 20 21 import com.android.server.usb.descriptors.report.UsbStrings; 22 23 /** 24 * @hide 25 * A class that just walks the descriptors and does a hex dump of the contained values. 26 * Usefull as a debugging tool. 27 */ 28 public final class UsbBinaryParser { 29 private static final String TAG = "UsbBinaryParser"; 30 private static final boolean LOGGING = false; 31 32 private void dumpDescriptor(ByteStream stream, int length, byte type, StringBuilder builder) { 33 34 // Log 35 if (LOGGING) { 36 Log.i(TAG, "l: " + length + " t: " + Integer.toHexString(type) + " " 37 + UsbStrings.getDescriptorName(type)); 38 StringBuilder sb = new StringBuilder(); 39 for (int index = 2; index < length; index++) { 40 sb.append("0x" + Integer.toHexString(stream.getByte() & 0xFF) + " "); 41 } 42 Log.i(TAG, sb.toString()); 43 } else { 44 // Screen Dump 45 builder.append("<p>"); 46 builder.append("<b> l: " + length 47 + " t:0x" + Integer.toHexString(type) + " " 48 + UsbStrings.getDescriptorName(type) + "</b><br>"); 49 for (int index = 2; index < length; index++) { 50 builder.append("0x" + Integer.toHexString(stream.getByte() & 0xFF) + " "); 51 } 52 builder.append("</p>"); 53 } 54 } 55 56 /** 57 * Walk through descriptor stream and generate an HTML text report of the contents. 58 * TODO: This should be done in the model of UsbDescriptorsParser/Reporter model. 59 */ 60 public void parseDescriptors(UsbDeviceConnection connection, byte[] descriptors, 61 StringBuilder builder) { 62 63 builder.append("<tt>"); 64 ByteStream stream = new ByteStream(descriptors); 65 while (stream.available() > 0) { 66 int length = (int) stream.getByte() & 0x000000FF; 67 byte type = stream.getByte(); 68 dumpDescriptor(stream, length, type, builder); 69 } 70 builder.append("</tt>"); 71 } 72 } 73
