83 lines
2.5 KiB
Java
83 lines
2.5 KiB
Java
/*
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* Copyright (C) 2016 The CyanogenMod 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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package org.cyanogenmod.hardware;
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import android.util.Log;
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import org.cyanogenmod.internal.util.FileUtils;
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/**
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* Generate a unique but deterministic ID for this hardware, based on unchangeable
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* hardware serial numbers.
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*/
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public class UniqueDeviceId {
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private static final String TAG = "UniqueDeviceId";
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private static final int TYPE_MMC0_CID = 0;
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private static String sUniqueId = null;
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private static final String MMC_TYPE = "/sys/block/mmcblk0/device/type";
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private static final String MMC_CID = "/sys/block/mmcblk0/device/cid";
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/**
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* Whether device supports reporting a unique device id.
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*
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* @return boolean Supported devices must return always true
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*/
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public static boolean isSupported() {
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return FileUtils.isFileReadable(MMC_TYPE) &&
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FileUtils.isFileReadable(MMC_CID) &&
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getUniqueDeviceIdInternal() != null;
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}
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/**
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* This method retreives a unique ID for the device.
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*
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* @return String The unique device ID
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*/
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public static String getUniqueDeviceId() {
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return getUniqueDeviceIdInternal();
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}
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private static String getUniqueDeviceIdInternal() {
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if (sUniqueId != null) {
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return sUniqueId;
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}
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try {
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String sMmcType = FileUtils.readOneLine(MMC_TYPE);
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String sCid = FileUtils.readOneLine(MMC_CID);
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if ("MMC".equals(sMmcType) && sCid != null) {
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sCid = sCid.trim();
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if (sCid.length() == 32) {
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sUniqueId = String.format("%03x00000%32s", TYPE_MMC0_CID, sCid);
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return sUniqueId;
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}
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}
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} catch (Exception e) {
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Log.e(TAG, "Failed to get unique device ID: " + e.getMessage());
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return null;
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}
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/* Any additional types should be added here. */
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return null;
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}
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}
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