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 17 #define LOG_TAG "UsbHostManagerJNI" 18 #include "utils/Log.h" 19 20 #include "jni.h" 21 #include "JNIHelp.h" 22 23 #include <usbhost/usbhost.h> 24 25 #define MAX_DESCRIPTORS_LENGTH 16384 26 27 // com.android.server.usb.descriptors 28 extern "C" { 29 jbyteArray JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getRawDescriptors( 30 JNIEnv* env, jobject thiz, jstring deviceAddr) { 31 const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL); 32 struct usb_device* device = usb_device_open(deviceAddrStr); 33 env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr); 34 35 if (!device) { 36 ALOGE("usb_device_open failed"); 37 return NULL; 38 } 39 40 int fd = usb_device_get_fd(device); 41 if (fd < 0) { 42 return NULL; 43 } 44 45 // from android_hardware_UsbDeviceConnection_get_desc() 46 jbyte buffer[MAX_DESCRIPTORS_LENGTH]; 47 lseek(fd, 0, SEEK_SET); 48 int numBytes = read(fd, buffer, sizeof(buffer)); 49 50 usb_device_close(device); 51 52 jbyteArray ret = NULL; 53 if (numBytes != 0) { 54 ret = env->NewByteArray(numBytes); 55 env->SetByteArrayRegion(ret, 0, numBytes, buffer); 56 } 57 return ret; 58 } 59 60 } // extern "C" 61 62 63
