17d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn/* 27d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * Copyright (C) 2011 The Android Open Source Project 37d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * 47d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * Licensed under the Apache License, Version 2.0 (the "License"); 57d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * you may not use this file except in compliance with the License. 67d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * You may obtain a copy of the License at 77d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * 87d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * http://www.apache.org/licenses/LICENSE-2.0 97d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * 107d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * Unless required by applicable law or agreed to in writing, software 117d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * distributed under the License is distributed on an "AS IS" BASIS, 127d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * See the License for the specific language governing permissions and 147d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn * limitations under the License. 157d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn */ 167d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 177d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackbornpackage com.android.internal.util; 187d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 197d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackbornimport java.io.FileInputStream; 207d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 217d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackbornimport android.os.StrictMode; 227d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 237d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackbornpublic class MemInfoReader { 247d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn byte[] mBuffer = new byte[1024]; 257d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 267d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn private long mTotalSize; 277d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn private long mFreeSize; 287d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn private long mCachedSize; 297d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 307d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn private boolean matchText(byte[] buffer, int index, String text) { 317d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn int N = text.length(); 327d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn if ((index+N) >= buffer.length) { 337d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return false; 347d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 357d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn for (int i=0; i<N; i++) { 367d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn if (buffer[index+i] != text.charAt(i)) { 377d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return false; 387d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 397d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 407d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return true; 417d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 427d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 437d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn private long extractMemValue(byte[] buffer, int index) { 447d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn while (index < buffer.length && buffer[index] != '\n') { 457d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn if (buffer[index] >= '0' && buffer[index] <= '9') { 467d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn int start = index; 477d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn index++; 487d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn while (index < buffer.length && buffer[index] >= '0' 497d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn && buffer[index] <= '9') { 507d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn index++; 517d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 527d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn String str = new String(buffer, 0, start, index-start); 537d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return ((long)Integer.parseInt(str)) * 1024; 547d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 557d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn index++; 567d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 577d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return 0; 587d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 597d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 607d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn public void readMemInfo() { 617d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn // Permit disk reads here, as /proc/meminfo isn't really "on 627d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn // disk" and should be fast. TODO: make BlockGuard ignore 637d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn // /proc/ and /sys/ files perhaps? 647d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads(); 657d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn try { 667d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mTotalSize = 0; 677d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mFreeSize = 0; 687d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mCachedSize = 0; 697d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn FileInputStream is = new FileInputStream("/proc/meminfo"); 707d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn int len = is.read(mBuffer); 717d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn is.close(); 727d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn final int BUFLEN = mBuffer.length; 737d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn int count = 0; 747d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn for (int i=0; i<len && count < 3; i++) { 757d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn if (matchText(mBuffer, i, "MemTotal")) { 767d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn i += 8; 777d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mTotalSize = extractMemValue(mBuffer, i); 787d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn count++; 797d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } else if (matchText(mBuffer, i, "MemFree")) { 807d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn i += 7; 817d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mFreeSize = extractMemValue(mBuffer, i); 827d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn count++; 837d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } else if (matchText(mBuffer, i, "Cached")) { 847d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn i += 6; 857d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn mCachedSize = extractMemValue(mBuffer, i); 867d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn count++; 877d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 887d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn while (i < BUFLEN && mBuffer[i] != '\n') { 897d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn i++; 907d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 917d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 927d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } catch (java.io.FileNotFoundException e) { 937d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } catch (java.io.IOException e) { 947d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } finally { 957d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn StrictMode.setThreadPolicy(savedPolicy); 967d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 977d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 987d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 997d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn public long getTotalSize() { 1007d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return mTotalSize; 1017d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 1027d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 1037d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn public long getFreeSize() { 1047d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return mFreeSize; 1057d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 1067d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn 1077d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn public long getCachedSize() { 1087d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn return mCachedSize; 1097d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn } 1107d608423b721e0153f37bfd5eba78fcd2489562dDianne Hackborn} 111