Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/FilterDataAccess.java @ 713:661e77dc88ba tip
Mac support: respect Mac alternatives of command-line arguments for common unix tools
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Sun, 03 Aug 2014 18:09:00 +0200 |
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1 /* |
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2 * Copyright (c) 2011-2012 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.internal; |
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18 |
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19 import java.io.IOException; |
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20 |
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21 |
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22 /** |
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23 * XXX Perhaps, DataAccessSlice? Unlike FilterInputStream, we limit amount of data read from DataAccess being filtered. |
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24 * |
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25 * |
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26 * @author Artem Tikhomirov |
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27 * @author TMate Software Ltd. |
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28 */ |
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29 public class FilterDataAccess extends DataAccess { |
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30 private final DataAccess dataAccess; |
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31 private final long offset; |
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32 private final int length; |
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33 private int count; |
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34 |
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35 public FilterDataAccess(DataAccess dataAccess, long offset, int length) { |
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36 this.dataAccess = dataAccess; |
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37 this.offset = offset; |
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38 this.length = length; |
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39 count = length; |
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40 } |
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41 |
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42 protected int available() throws IOException { |
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43 return count; |
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44 } |
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45 |
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46 @Override |
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47 public FilterDataAccess reset() throws IOException { |
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48 dataAccess.reset(); |
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49 count = length; |
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50 return this; |
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51 } |
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52 |
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53 @Override |
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54 public boolean isEmpty() throws IOException { |
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55 return count <= 0; |
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56 } |
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57 |
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58 @Override |
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59 public int length() throws IOException { |
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60 return length; |
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61 } |
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62 |
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63 @Override |
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64 public void seek(int localOffset) throws IOException { |
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65 if (localOffset < 0 || localOffset > length) { |
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66 throw new IllegalArgumentException(); |
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67 } |
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68 dataAccess.longSeek(offset + localOffset); |
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69 count = length - localOffset; |
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70 } |
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71 |
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72 @Override |
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73 public void skip(int bytes) throws IOException { |
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74 int newCount = count - bytes; |
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75 if (newCount < 0 || newCount > length) { |
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76 throw new IllegalArgumentException(); |
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77 } |
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78 seek(length - newCount); |
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79 /* |
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80 can't use next code because don't want to rewind backing DataAccess on reset() |
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81 i.e. this.reset() modifies state of this instance only, while filtered DA may go further. |
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82 Only actual this.skip/seek/read would rewind it to desired position |
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83 dataAccess.skip(bytes); |
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84 count = newCount; |
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85 */ |
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86 |
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87 } |
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88 |
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89 @Override |
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90 public byte readByte() throws IOException { |
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91 if (count <= 0) { |
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92 throw new IOException(String.format("Underflow. Bytes left: %d. FilterDA[offset: %d, length: %d]", count, offset, length)); |
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93 } |
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94 if (count == length) { |
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95 dataAccess.longSeek(offset); |
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96 } |
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97 count--; |
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98 return dataAccess.readByte(); |
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99 } |
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100 |
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101 @Override |
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102 public void readBytes(byte[] b, int off, int len) throws IOException { |
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103 if (len == 0) { |
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104 return; |
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105 } |
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106 if (count <= 0 || len > count) { |
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Issue 24: IAE, Underflow in FilterDataAccess. Issue 26:UnsupportedOperationException when patching empty base revision. Tests
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
188
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107 throw new IOException(String.format("Underflow. Bytes left: %d, asked to read %d. FilterDA[offset: %d, length: %d]", count, len, offset, length)); |
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9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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108 } |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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109 if (count == length) { |
420
6c22bdc0bdfd
Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
397
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110 dataAccess.longSeek(offset); |
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9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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111 } |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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112 dataAccess.readBytes(b, off, len); |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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113 count -= len; |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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114 } |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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115 |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
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116 // done shall be no-op, as we have no idea what's going on with DataAccess we filter |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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117 } |