/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "UsbHostManagerJNI"
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#include "utils/Log.h"
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#include <stdlib.h>
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#include "jni.h"
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#include <nativehelper/JNIHelp.h>
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#include <usbhost/usbhost.h>
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#define MAX_DESCRIPTORS_LENGTH 4096
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static const int USB_CONTROL_TRANSFER_TIMEOUT_MS = 200;
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// com.android.server.usb.descriptors
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extern "C" {
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jbyteArray JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getRawDescriptors_1native(
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JNIEnv* env, jobject thiz, jstring deviceAddr) {
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const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL);
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struct usb_device* device = usb_device_open(deviceAddrStr);
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env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr);
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if (!device) {
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ALOGE("usb_device_open failed");
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return NULL;
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}
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int fd = usb_device_get_fd(device);
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if (fd < 0) {
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usb_device_close(device);
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return NULL;
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}
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// from android_hardware_UsbDeviceConnection_get_desc()
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jbyte buffer[MAX_DESCRIPTORS_LENGTH];
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lseek(fd, 0, SEEK_SET);
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int numBytes = read(fd, buffer, sizeof(buffer));
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jbyteArray ret = NULL;
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usb_device_close(device);
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if (numBytes > 0) {
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ret = env->NewByteArray(numBytes);
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env->SetByteArrayRegion(ret, 0, numBytes, buffer);
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} else {
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ALOGE("error reading descriptors\n");
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}
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return ret;
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}
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jstring JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getDescriptorString_1native(
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JNIEnv* env, jobject thiz, jstring deviceAddr, jint stringId) {
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const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL);
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struct usb_device* device = usb_device_open(deviceAddrStr);
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env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr);
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if (!device) {
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ALOGE("usb_device_open failed");
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return NULL;
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}
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int fd = usb_device_get_fd(device);
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if (fd < 0) {
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ALOGE("usb_device_get_fd failed");
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usb_device_close(device);
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return NULL;
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}
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// Get Raw UCS2 Bytes
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jbyte* byteBuffer = NULL;
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size_t numUSC2Bytes = 0;
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int retVal =
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usb_device_get_string_ucs2(device, stringId,
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USB_CONTROL_TRANSFER_TIMEOUT_MS,
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(void**)&byteBuffer, &numUSC2Bytes);
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jstring j_str = NULL;
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if (retVal == 0) {
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j_str = env->NewString((jchar*)byteBuffer, numUSC2Bytes/2);
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free(byteBuffer);
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}
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usb_device_close(device);
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return j_str;
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}
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} // extern "C"
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