blob: d710e1b879fa2f2a178d6084103700e2bfe44fc3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/*
* Copyright (C) 2016 The CyanogenMod 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.
*/
package org.cyanogenmod.hardware;
import org.cyanogenmod.hardware.util.FileUtils;
/**
* Generate a unique but deterministic ID for this hardware, based on unchangeable
* hardware serial numbers.
*/
public class UniqueDeviceId {
private static final int TYPE_MMC0_CID = 0;
private static String sUniqueId = null;
/**
* Whether device supports reporting a unique device id.
*
* @return boolean Supported devices must return always true
*/
public static boolean isSupported() {
return getUniqueDeviceIdInternal() != null;
}
/**
* This method retreives a unique ID for the device.
*
* @return String The unique device ID
*/
public static String getUniqueDeviceId() {
return getUniqueDeviceIdInternal();
}
private static String getUniqueDeviceIdInternal() {
if (sUniqueId != null) {
return sUniqueId;
}
String sMmcType = FileUtils.readOneLine("/sys/block/mmcblk0/device/type");
String sCid = FileUtils.readOneLine("/sys/block/mmcblk0/device/cid");
if ("MMC".equals(sMmcType) && sCid != null) {
sCid = sCid.trim();
if (sCid.length() == 32) {
sUniqueId = String.format("%03x00000%32s", TYPE_MMC0_CID, sCid);
return sUniqueId;
}
}
/* Any additional types should be added here. */
return null;
}
}
|
