| /* |
| * Copyright (C) 2011 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. |
| */ |
| |
| package com.android.internal.util; |
| |
| import java.io.FileInputStream; |
| |
| import android.os.Debug; |
| import android.os.StrictMode; |
| |
| public class MemInfoReader { |
| byte[] mBuffer = new byte[1024]; |
| |
| private long mTotalSize; |
| private long mFreeSize; |
| private long mCachedSize; |
| |
| private boolean matchText(byte[] buffer, int index, String text) { |
| int N = text.length(); |
| if ((index+N) >= buffer.length) { |
| return false; |
| } |
| for (int i=0; i<N; i++) { |
| if (buffer[index+i] != text.charAt(i)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private long extractMemValue(byte[] buffer, int index) { |
| while (index < buffer.length && buffer[index] != '\n') { |
| if (buffer[index] >= '0' && buffer[index] <= '9') { |
| int start = index; |
| index++; |
| while (index < buffer.length && buffer[index] >= '0' |
| && buffer[index] <= '9') { |
| index++; |
| } |
| String str = new String(buffer, 0, start, index-start); |
| return ((long)Integer.parseInt(str)) * 1024; |
| } |
| index++; |
| } |
| return 0; |
| } |
| |
| public void readMemInfo() { |
| // Permit disk reads here, as /proc/meminfo isn't really "on |
| // disk" and should be fast. TODO: make BlockGuard ignore |
| // /proc/ and /sys/ files perhaps? |
| StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); |
| try { |
| long[] infos = new long[Debug.MEMINFO_COUNT]; |
| Debug.getMemInfo(infos); |
| mTotalSize = infos[Debug.MEMINFO_TOTAL] * 1024; |
| mFreeSize = infos[Debug.MEMINFO_FREE] * 1024; |
| mCachedSize = infos[Debug.MEMINFO_CACHED] * 1024; |
| } finally { |
| StrictMode.setThreadPolicy(savedPolicy); |
| } |
| } |
| |
| public long getTotalSize() { |
| return mTotalSize; |
| } |
| |
| public long getFreeSize() { |
| return mFreeSize; |
| } |
| |
| public long getCachedSize() { |
| return mCachedSize; |
| } |
| } |