| /* |
| * Copyright (C) 2012 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.mail.photomanager; |
| |
| import android.os.StrictMode; |
| |
| import java.io.FileInputStream; |
| |
| public class MemInfoReader { |
| byte[] mBuffer = new byte[1024]; |
| |
| private long mTotalSize; |
| private long mFreeSize; |
| private long mCachedSize; |
| |
| private static 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 static 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 { |
| mTotalSize = 0; |
| mFreeSize = 0; |
| mCachedSize = 0; |
| FileInputStream is = new FileInputStream("/proc/meminfo"); |
| int len = is.read(mBuffer); |
| is.close(); |
| final int BUFLEN = mBuffer.length; |
| int count = 0; |
| for (int i = 0; i < len && count < 3; i++) { |
| if (matchText(mBuffer, i, "MemTotal")) { |
| i += 8; |
| mTotalSize = extractMemValue(mBuffer, i); |
| count++; |
| } else if (matchText(mBuffer, i, "MemFree")) { |
| i += 7; |
| mFreeSize = extractMemValue(mBuffer, i); |
| count++; |
| } else if (matchText(mBuffer, i, "Cached")) { |
| i += 6; |
| mCachedSize = extractMemValue(mBuffer, i); |
| count++; |
| } |
| while (i < BUFLEN && mBuffer[i] != '\n') { |
| i++; |
| } |
| } |
| } catch (java.io.FileNotFoundException e) { |
| } catch (java.io.IOException e) { |
| } finally { |
| StrictMode.setThreadPolicy(savedPolicy); |
| } |
| } |
| |
| public long getTotalSize() { |
| return mTotalSize; |
| } |
| |
| public long getFreeSize() { |
| return mFreeSize; |
| } |
| |
| public long getCachedSize() { |
| return mCachedSize; |
| } |
| } |