19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.os; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.ByteArrayOutputStream; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.File; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileInputStream; 226d25a990afffd5eb385aba3043d5dfad36f1539aWink Savilleimport java.io.FileNotFoundException; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileOutputStream; 24da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwoodimport java.io.FileWriter; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.regex.Pattern; 286d25a990afffd5eb385aba3043d5dfad36f1539aWink Savilleimport java.util.zip.CRC32; 296d25a990afffd5eb385aba3043d5dfad36f1539aWink Savilleimport java.util.zip.CheckedInputStream; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Tools for managing files. Not for public consumption. 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 366d25a990afffd5eb385aba3043d5dfad36f1539aWink Savillepublic class FileUtils { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IRWXU = 00700; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IRUSR = 00400; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IWUSR = 00200; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IXUSR = 00100; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IRWXG = 00070; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IRGRP = 00040; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IWGRP = 00020; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IXGRP = 00010; 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IRWXO = 00007; 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IROTH = 00004; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IWOTH = 00002; 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int S_IXOTH = 00001; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * File status information. This class maps directly to the POSIX stat structure. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final class FileStatus { 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int dev; 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int ino; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int mode; 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int nlink; 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int uid; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int gid; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int rdev; 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long size; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int blksize; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long blocks; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long atime; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long mtime; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long ctime; 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the status for the given path. This is equivalent to the POSIX stat(2) system call. 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param path The path of the file to be stat'd. 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param status Optional argument to fill in. It will only fill in the status if the file 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * exists. 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the file exists and false if it does not exist. If you do not have 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * permission to stat the file, then this method will return false. 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 814e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick public static boolean getFileStatus(String path, FileStatus status) { 824e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick StrictMode.noteDiskRead(); 834e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick return getFileStatusNative(path, status); 844e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick } 854e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick 864e920f70f38d52d3a74c6a3133388a2e2cb6c175Brad Fitzpatrick private static native boolean getFileStatusNative(String path, FileStatus status); 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Regular expression for safe filenames: no spaces or metacharacters */ 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final Pattern SAFE_FILENAME_PATTERN = Pattern.compile("[\\w%+,./=_-]+"); 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native int setPermissions(String file, int mode, int uid, int gid); 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native int getPermissions(String file, int[] outPermissions); 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9590960e87ecae696f73ae18e46c2f003fc3f592ccMike Lockwood public static native int setUMask(int mask); 9690960e87ecae696f73ae18e46c2f003fc3f592ccMike Lockwood 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** returns the FAT file system volume ID for the volume mounted 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at the given mount point, or -1 for failure 996d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * @param mountPoint point for FAT volume 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return volume ID or -1 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native int getFatVolumeId(String mountPoint); 1038bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn 1048bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn /** 1058bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn * Perform an fsync on the given FileOutputStream. The stream at this 1068bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn * point must be flushed but not yet closed. 1078bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn */ 1088bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn public static boolean sync(FileOutputStream stream) { 1098bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn try { 1108bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn if (stream != null) { 1118bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn stream.getFD().sync(); 1128bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } 1138bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn return true; 1148bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } catch (IOException e) { 1158bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } 1168bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn return false; 1178bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } 1188bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // copy a file from srcFile to destFile, return true if succeed, return 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // false if fail 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean copyFile(File srcFile, File destFile) { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean result = false; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project InputStream in = new FileInputStream(srcFile); 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project result = copyToFile(in, destFile); 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } finally { 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project in.close(); 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (IOException e) { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project result = false; 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return result; 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copy data from a source stream to destFile. 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if succeed, return false if failed. 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean copyToFile(InputStream inputStream, File destFile) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1421afd1c90ebe789b8d3a137004127a50d2db7e3b5Dianne Hackborn if (destFile.exists()) { 1431afd1c90ebe789b8d3a137004127a50d2db7e3b5Dianne Hackborn destFile.delete(); 1441afd1c90ebe789b8d3a137004127a50d2db7e3b5Dianne Hackborn } 1458bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn FileOutputStream out = new FileOutputStream(destFile); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] buffer = new byte[4096]; 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bytesRead; 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while ((bytesRead = inputStream.read(buffer)) >= 0) { 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(buffer, 0, bytesRead); 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } finally { 1538bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn out.flush(); 1548bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn try { 1558bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn out.getFD().sync(); 1568bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } catch (IOException e) { 1578bdf5935c0db4a66ab33a10b43398d2523cfa15dDianne Hackborn } 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.close(); 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (IOException e) { 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Check if a filename is "safe" (no metacharacters or spaces). 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param file The file to check 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean isFilenameSafe(File file) { 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Note, we check whether it matches what's known to be safe, 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // rather than what's known to be unsafe. Non-ASCII, control 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // characters, etc. are all unsafe by default. 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return SAFE_FILENAME_PATTERN.matcher(file.getPath()).matches(); 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Read a text file into a String, optionally limiting the length. 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param file to read (will not seek, so things like /proc files are OK) 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param max length (positive for head, negative of tail, 0 for no limit) 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param ellipsis to add of the file was truncated (can be null) 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the contents of the file, possibly truncated 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IOException if something goes wrong reading the file 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static String readTextFile(File file, int max, String ellipsis) throws IOException { 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project InputStream input = new FileInputStream(file); 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 18842471dd5552a346dd82a58a663159875ccc4fb79Dan Egnor long size = file.length(); 18942471dd5552a346dd82a58a663159875ccc4fb79Dan Egnor if (max > 0 || (size > 0 && max == 0)) { // "head" mode: read the first N bytes 19042471dd5552a346dd82a58a663159875ccc4fb79Dan Egnor if (size > 0 && (max == 0 || size < max)) max = (int) size; 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] data = new byte[max + 1]; 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = input.read(data); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (length <= 0) return ""; 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (length <= max) return new String(data, 0, length); 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ellipsis == null) return new String(data, 0, max); 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new String(data, 0, max) + ellipsis; 19742471dd5552a346dd82a58a663159875ccc4fb79Dan Egnor } else if (max < 0) { // "tail" mode: keep the last N 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int len; 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean rolled = false; 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] last = null, data = null; 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project do { 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (last != null) rolled = true; 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] tmp = last; last = data; data = tmp; 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (data == null) data = new byte[-max]; 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project len = input.read(data); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } while (len == data.length); 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (last == null && len <= 0) return ""; 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (last == null) return new String(data, 0, len); 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (len > 0) { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rolled = true; 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.arraycopy(last, len, last, 0, last.length - len); 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.arraycopy(data, 0, last, last.length - len, len); 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ellipsis == null || !rolled) return new String(last); 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return ellipsis + new String(last); 21742471dd5552a346dd82a58a663159875ccc4fb79Dan Egnor } else { // "cat" mode: size unknown, read it all in streaming fashion 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ByteArrayOutputStream contents = new ByteArrayOutputStream(); 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int len; 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] data = new byte[1024]; 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project do { 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project len = input.read(data); 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (len > 0) contents.write(data, 0, len); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } while (len == data.length); 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return contents.toString(); 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } finally { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project input.close(); 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 231da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood 232da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood /** 233da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood * Writes string to file. Basically same as "echo -n $string > $filename" 234da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood * 235da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood * @param filename 236da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood * @param string 237da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood * @throws IOException 238da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood */ 239da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood public static void stringToFile(String filename, String string) throws IOException { 240da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood FileWriter out = new FileWriter(filename); 241da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood try { 242da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood out.write(string); 243da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood } finally { 244da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood out.close(); 245da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood } 246da8bb74b9d9ffcb095815db800d0816c411f1fbaMike Lockwood } 2471b9a6a6e58fd73b5d1b6a434d17f0a69806858ecWink Saville 2486d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville /** 2496d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * Computes the checksum of a file using the CRC32 checksum routine. 2506d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * The value of the checksum is returned. 2516d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * 2526d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * @param file the file to checksum, must not be null 2536d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville * @return the checksum value or an exception is thrown. 2546d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville */ 2556d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville public static long checksumCrc32(File file) throws FileNotFoundException, IOException { 2566d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville CRC32 checkSummer = new CRC32(); 2576d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville CheckedInputStream cis = null; 2586d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville 2596d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville try { 2606d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville cis = new CheckedInputStream( new FileInputStream(file), checkSummer); 2616d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville byte[] buf = new byte[128]; 2626d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville while(cis.read(buf) >= 0) { 2636d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville // Just read for checksum to get calculated. 2646d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } 2656d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville return checkSummer.getValue(); 2666d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } finally { 2676d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville if (cis != null) { 2686d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville try { 2696d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville cis.close(); 2706d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } catch (IOException e) { 2716d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } 2726d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } 2736d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } 2746d25a990afffd5eb385aba3043d5dfad36f1539aWink Saville } 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 276