Mercurial > hg > ucis.core

annotate Util/TapeArchive.cs @ 54:ba4e2cb031e0

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Added general purpose tar archive reader class
author Ivo Smits <Ivo@UCIS.nl>
date Wed, 02 Oct 2013 21:17:30 +0200
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54
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1 ???using System;
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2 using System.Collections;
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3 using System.Collections.Generic;
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4 using System.IO;
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5 using System.Text;
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6
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7 namespace UCIS.Util {
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8 public class TarchiveReader : IDisposable, IEnumerator<TarchiveEntry>, IEnumerable<TarchiveEntry> {
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9 public Stream Source { get; private set; }
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10 public TarchiveEntry CurrentEntry { get; private set; }
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11 private Int64 SourceOffsetBase = 0;
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12 private Int64 SourceOffset = 0;
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13 private Boolean CanSeek = false;
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14 public TarchiveReader(String tarFile) : this(File.OpenRead(tarFile)) { }
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15 public TarchiveReader(Type type, String resource) : this(type.Assembly.GetManifestResourceStream(type, resource)) { }
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16 public TarchiveReader(Stream tar) {
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17 this.Source = tar;
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18 CanSeek = Source.CanSeek;
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19 if (CanSeek) SourceOffset = SourceOffsetBase = Source.Position;
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20 }
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21 public void Dispose() {
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22 Source.Dispose();
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23 }
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24 private static String ReadString(Byte[] header, int offset, int maxlength) {
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25 int end = Array.IndexOf<Byte>(header, 0, offset, maxlength);
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26 int length = (end == -1) ? maxlength : end - offset;
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27 return Encoding.UTF8.GetString(header, offset, length);
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28 }
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29 private void SeekForward(Int64 position) {
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30 if (CanSeek) {
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31 Source.Seek(position, SeekOrigin.Begin);
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32 SourceOffset = position;
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33 } else {
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34 if (position < SourceOffset) throw new ArgumentOutOfRangeException("Can not seek backwards");
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35 Byte[] buffer = new Byte[1024];
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36 while (position > SourceOffset) {
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37 int read = Source.Read(buffer, 0, (int)Math.Min(1024, position - SourceOffset));
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38 if (read <= 0) throw new EndOfStreamException();
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39 SourceOffset += read;
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40 }
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41 }
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42 }
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43 private Int32 GetPaddedSize(Int32 size) {
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44 int padding = size % 512;
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45 if (padding != 0) padding = 512 - padding;
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46 return size + padding;
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47 }
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48 private Byte[] ReadAll(int length) {
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49 Byte[] buffer = new Byte[length];
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50 int offset = 0;
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51 while (length > 0) {
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52 int read = Source.Read(buffer, offset, length);
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53 if (read <= 0) throw new EndOfStreamException();
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54 offset += read;
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55 length -= read;
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56 SourceOffset += read;
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57 }
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58 return buffer;
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59 }
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60 private Boolean IsAllZero(Byte[] header, int offset, int length) {
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61 length += offset;
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62 for (int i = offset; i < length; i++) if (header[i] != 0) return false;
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63 return true;
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64 }
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65 public TarchiveEntry ReadNext() {
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66 if (CurrentEntry != null) SeekForward(CurrentEntry.Offset + 512 + GetPaddedSize(CurrentEntry.Size));
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67 CurrentEntry = null;
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68 Byte[] header = ReadAll(512);
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69 if (IsAllZero(header, 0, header.Length)) return null;
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70 Boolean ustar = (ReadString(header, 257, 6) == "ustar");
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71 String fname = ReadString(header, 0, 100);
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72 String fsizes = ReadString(header, 124, 11);
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73 Int32 fsize = Convert.ToInt32(fsizes, 8);
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74 if (ustar) fname = ReadString(header, 345, 155) + fname;
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75 String ffname = fname.StartsWith("./") ? (fname.Length == 2 ? "/" : fname.Substring(2)) : fname;
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76 ffname = ffname.TrimEnd('/');
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77 TarchiveEntry entry = new TarchiveEntry() { Reader = this, OriginalName = fname, Offset = SourceOffset - 512, Size = fsize, Name = ffname };
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78 if (ustar) {
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79 entry.IsDirectory = header[156] == '5';
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80 entry.IsDirectory = header[156] == '0' || header[156] == 0;
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81 } else {
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82 entry.IsDirectory = fname.EndsWith("/");
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83 entry.IsFile = !entry.IsDirectory && header[156] == '0';
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84 }
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85 return CurrentEntry = entry;
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86 }
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87 public int ReadEntryData(TarchiveEntry entry, int fileoffset, Byte[] buffer, int bufferoffset, int count) {
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88 if (entry.Reader != this) throw new ArgumentException("The specified entry is not part of this archive");
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89 if (count < 0) throw new ArgumentOutOfRangeException("count", "Count is negative");
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90 if (count == 0) return 0;
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91 if (!entry.IsFile) throw new ArgumentException("entry", "Specified entry is not a file");
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92 if (fileoffset > entry.Size) throw new ArgumentOutOfRangeException("fileoffset", "File offset exceeds file size");
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93 if (fileoffset == entry.Size) return 0;
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94 if (bufferoffset < 0) throw new ArgumentOutOfRangeException("bufferoffset", "Buffer offset is negative");
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95 if (bufferoffset + count > buffer.Length) throw new ArgumentOutOfRangeException("count", "Buffer offset and count exceed buffer dimensions");
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96 SeekForward(entry.Offset + 512 + fileoffset);
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97 int read = Source.Read(buffer, bufferoffset, Math.Min(count, entry.Size - fileoffset));
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98 if (read > 0) SourceOffset += read;
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99 return read;
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100 }
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101 public void SeekToEntry(TarchiveEntry entry) {
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102 if (entry.Reader != this) throw new ArgumentException("The specified entry is not part of this archive");
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103 SeekForward(entry.Offset);
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104 }
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105 public Stream GetFileStream(TarchiveEntry entry) {
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106 if (entry.Reader != this) throw new ArgumentException("The specified entry is not part of this archive");
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107 return new ReaderStream(this, entry);
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108 }
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109 TarchiveEntry IEnumerator<TarchiveEntry>.Current {
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110 get { return CurrentEntry; }
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111 }
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112 object IEnumerator.Current {
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113 get { return CurrentEntry; }
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114 }
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115 bool IEnumerator.MoveNext() {
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116 return ReadNext() != null;
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117 }
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118 void IEnumerator.Reset() {
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119 SeekForward(SourceOffsetBase);
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120 }
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121 IEnumerator<TarchiveEntry> IEnumerable<TarchiveEntry>.GetEnumerator() {
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122 return this;
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123 }
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124 IEnumerator IEnumerable.GetEnumerator() {
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125 return this;
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126 }
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127
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128 class ReaderStream : Stream {
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129 long position = 0;
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130 public TarchiveReader Source { get; private set; }
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131 public TarchiveEntry File { get; private set; }
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132 public ReaderStream(TarchiveReader source, TarchiveEntry entry) {
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133 this.Source = source;
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134 this.File = entry;
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135 }
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136 public override bool CanRead { get { return Source != null && Source.Source.CanRead && Position < Length; } }
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137 public override bool CanSeek { get { return Source != null && Source.Source.CanSeek; } }
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138 public override bool CanWrite { get { return false; } }
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139 protected override void Dispose(bool disposing) {
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140 base.Dispose(disposing);
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141 Source = null;
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142 File = null;
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143 }
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144 public override long Length { get { return File.Size; } }
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145 public override long Position {
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146 get { return position; }
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147 set {
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148 if (value < 0 || value > Length) throw new ArgumentOutOfRangeException("value");
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149 position = value;
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150 }
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151 }
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152 public override long Seek(long offset, SeekOrigin origin) {
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153 switch (origin) {
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154 case SeekOrigin.Begin: Position = offset; break;
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155 case SeekOrigin.Current: Position += offset; break;
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156 case SeekOrigin.End: Position = Length - offset; break;
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157 }
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158 return position;
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159 }
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160 public override int Read(byte[] buffer, int offset, int count) {
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161 int read = Source.ReadEntryData(File, (int)position, buffer, offset, count);
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162 position += read;
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163 return read;
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164 }
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165 public override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
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166 public override void SetLength(long value) { throw new NotSupportedException(); }
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167 public override void Flush() { }
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168 }
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169 }
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170 public class TarchiveEntry {
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171 public TarchiveReader Reader { get; internal set; }
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172 public String Name { get; internal set; }
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173 public String OriginalName { get; internal set; }
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174 public Boolean IsDirectory { get; internal set; }
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175 public Boolean IsFile { get; internal set; }
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176 public Int32 Size { get; internal set; }
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177 public Int64 Offset { get; internal set; }
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178
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179 public int Read(int fileoffset, Byte[] buffer, int bufferoffset, int count) {
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180 return Reader.ReadEntryData(this, fileoffset, buffer, bufferoffset, count);
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181 }
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182
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183 public Stream GetStream() {
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184 return Reader.GetFileStream(this);
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185 }
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186 }
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187 }