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 <stdlib.h>
21
22#include "jni.h"
23#include <nativehelper/JNIHelp.h>
24
25#include <usbhost/usbhost.h>
26
27#define MAX_DESCRIPTORS_LENGTH 4096
28
29// com.android.server.usb.descriptors
30extern "C" {
31jbyteArray JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getRawDescriptors_1native(
32        JNIEnv* env, jobject thiz, jstring deviceAddr) {
33    const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL);
34    struct usb_device* device = usb_device_open(deviceAddrStr);
35    env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr);
36
37    if (!device) {
38        ALOGE("usb_device_open failed");
39        return NULL;
40    }
41
42    int fd = usb_device_get_fd(device);
43    if (fd < 0) {
44        usb_device_close(device);
45        return NULL;
46    }
47
48    // from android_hardware_UsbDeviceConnection_get_desc()
49    jbyte buffer[MAX_DESCRIPTORS_LENGTH];
50    lseek(fd, 0, SEEK_SET);
51    int numBytes = read(fd, buffer, sizeof(buffer));
52    jbyteArray ret = NULL;
53    usb_device_close(device);
54
55    if (numBytes > 0) {
56        ret = env->NewByteArray(numBytes);
57        env->SetByteArrayRegion(ret, 0, numBytes, buffer);
58    } else {
59        ALOGE("error reading descriptors\n");
60    }
61
62    return ret;
63}
64
65jstring JNICALL Java_com_android_server_usb_descriptors_UsbDescriptorParser_getDescriptorString_1native(
66        JNIEnv* env, jobject thiz, jstring deviceAddr, jint stringId) {
67
68    const char *deviceAddrStr = env->GetStringUTFChars(deviceAddr, NULL);
69    struct usb_device* device = usb_device_open(deviceAddrStr);
70    env->ReleaseStringUTFChars(deviceAddr, deviceAddrStr);
71
72    if (!device) {
73        ALOGE("usb_device_open failed");
74        return NULL;
75    }
76
77    int fd = usb_device_get_fd(device);
78    if (fd < 0) {
79        ALOGE("usb_device_get_fd failed");
80        usb_device_close(device);
81        return NULL;
82    }
83
84    // Get Raw UCS2 Bytes
85    jbyte* byteBuffer = NULL;
86    size_t numUSC2Bytes = 0;
87    int retVal =
88            usb_device_get_string_ucs2(device, stringId, 0 /*timeout*/,
89                                     (void**)&byteBuffer, &numUSC2Bytes);
90
91    jstring j_str = NULL;
92
93    if (retVal == 0) {
94        j_str = env->NewString((jchar*)byteBuffer, numUSC2Bytes/2);
95        free(byteBuffer);
96    }
97
98    usb_device_close(device);
99
100    return j_str;
101}
102
103} // extern "C"
104