| /* |
| * Copyright (C) 2017 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 "UsbHostManagerJNI" |
| #include "utils/Log.h" |
| |
| #include <stdlib.h> |
| |
| #include "jni.h" |
| #include <nativehelper/JNIHelp.h> |
| |
| #include <usbhost/usbhost.h> |
| |
| #define MAX_DESCRIPTORS_LENGTH 4096 |
| |
| // com.android.server.usb.descriptors |
| extern "C" { |
| jbyteArray JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getRawDescriptors_1native( |
| JNIEnv* env, jobject thiz, jstring deviceAddr) { |
| const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL); |
| struct usb_device* device = usb_device_open(deviceAddrStr); |
| env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr); |
| |
| if (!device) { |
| ALOGE("usb_device_open failed"); |
| return NULL; |
| } |
| |
| int fd = usb_device_get_fd(device); |
| if (fd < 0) { |
| usb_device_close(device); |
| return NULL; |
| } |
| |
| // from android_hardware_UsbDeviceConnection_get_desc() |
| jbyte buffer[MAX_DESCRIPTORS_LENGTH]; |
| lseek(fd, 0, SEEK_SET); |
| int numBytes = read(fd, buffer, sizeof(buffer)); |
| jbyteArray ret = NULL; |
| usb_device_close(device); |
| |
| if (numBytes > 0) { |
| ret = env->NewByteArray(numBytes); |
| env->SetByteArrayRegion(ret, 0, numBytes, buffer); |
| } else { |
| ALOGE("error reading descriptors\n"); |
| } |
| |
| return ret; |
| } |
| |
| jstring JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getDescriptorString_1native( |
| JNIEnv* env, jobject thiz, jstring deviceAddr, jint stringId) { |
| |
| const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL); |
| struct usb_device* device = usb_device_open(deviceAddrStr); |
| env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr); |
| |
| if (!device) { |
| ALOGE("usb_device_open failed"); |
| return NULL; |
| } |
| |
| int fd = usb_device_get_fd(device); |
| if (fd < 0) { |
| ALOGE("usb_device_get_fd failed"); |
| usb_device_close(device); |
| return NULL; |
| } |
| |
| // Get Raw UCS2 Bytes |
| jbyte* byteBuffer = NULL; |
| size_t numUSC2Bytes = 0; |
| int retVal = |
| usb_device_get_string_ucs2(device, stringId, 0 /*timeout*/, |
| (void**)&byteBuffer, &numUSC2Bytes); |
| |
| jstring j_str = NULL; |
| |
| if (retVal == 0) { |
| j_str = env->NewString((jchar*)byteBuffer, numUSC2Bytes/2); |
| free(byteBuffer); |
| } |
| return j_str; |
| } |
| |
| } // extern "C" |