mcs/class/System.IO.Compression/ZipArchiveEntry.cs

   1 //
   2 // ZipArchiveEntry.cs
   3 //
   4 // Author:
   5 //       Joao Matos <joao.matos@xamarin.com>
   6 //       Martin Baulig <martin.baulig@xamarin.com>
   7 //
   8 // Copyright (c) 2013 Xamarin Inc. (http://www.xamarin.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining a copy
  11 // of this software and associated documentation files (the "Software"), to deal
  12 // in the Software without restriction, including without limitation the rights
  13 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 // copies of the Software, and to permit persons to whom the Software is
  15 // furnished to do so, subject to the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be included in
  18 // all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26 // THE SOFTWARE.
  27
  28 using SharpCompress.Archive;
  29
  30 namespace System.IO.Compression
  31 {
  32         internal class ZipArchiveEntryStream : Stream, IDisposable
  33         {
  34                 private readonly ZipArchiveEntry entry;
  35                 private Stream stream;
  36
  37                 public override bool CanRead {
  38                         get {
  39                                 return stream.CanRead;
  40                         }
  41                 }
  42
  43                 public override bool CanSeek {
  44                         get {
  45                                 return entry.Archive.Mode != ZipArchiveMode.Read;
  46                         }
  47                 }
  48
  49                 public override bool CanWrite {
  50                         get {
  51                                 return entry.Archive.Mode != ZipArchiveMode.Read;
  52                         }
  53                 }
  54
  55                 public override long Length {
  56                         get {
  57                                 return stream.Length;
  58                         }
  59                 }
  60
  61                 public override long Position {
  62                         get {
  63                                 return stream.Position;
  64                         }
  65                         set {
  66                                 stream.Position = value;
  67                         }
  68                 }
  69
  70                 public ZipArchiveEntryStream(ZipArchiveEntry entry, Stream stream)
  71                 {
  72                         this.entry = entry;
  73                         this.stream = stream;
  74                 }
  75
  76                 public override void Flush ()
  77                 {
  78                         stream.Flush();
  79                 }
  80
  81                 public override long Seek (long offset, SeekOrigin origin)
  82                 {
  83                         return stream.Seek(offset, origin);
  84                 }
  85
  86                 public override void SetLength (long value)
  87                 {
  88                         stream.SetLength(value);
  89                 }
  90
  91                 public override int Read (byte[] buffer, int offset, int count)
  92                 {
  93                         return stream.Read(buffer, offset, count);
  94                 }
  95
  96                 public override void Write (byte[] buffer, int offset, int count)
  97                 {
  98                         if (entry.Archive.Mode == ZipArchiveMode.Update && !entry.wasWritten)
  99                         {
 100                                 // Replace the read-only stream with a writeable memory stream.
 101                                 SetWriteable();
 102                                 entry.wasWritten = true;
 103                         }
 104
 105                         stream.Write(buffer, offset, count);
 106                 }
 107
 108                 internal void SetWriteable()
 109                 {
 110                         var archive = entry.Archive;
 111
 112                         var internalEntry = entry.entry;
 113                         var newEntry = archive.CreateEntryInternal(internalEntry.Key);
 114                         var newStream = newEntry.OpenEntryStream();
 115
 116                         var openStream = stream;
 117                         var position = openStream.Position;
 118
 119                         entry.openStream = null;
 120                         entry.Open();
 121
 122                         openStream.CopyTo(newStream);
 123                         newStream.Position = position;
 124                         openStream.Dispose();
 125
 126                         archive.zipFile.RemoveEntry(internalEntry);
 127                         entry.entry = newEntry;
 128                         stream = newStream;
 129                 }
 130
 131                 public new void Dispose()
 132                 {
 133                         Dispose(true);
 134                         GC.SuppressFinalize(this);
 135                         base.Dispose();
 136                 }
 137
 138                 protected override void Dispose(bool disposing)
 139                 {
 140                         if (disposing)
 141                         {
 142                                 entry.openStream = null;
 143                                 stream.Dispose();
 144                         }
 145                 }
 146         }
 147
 148         public class ZipArchiveEntry
 149         {
 150                 internal SharpCompress.Archive.Zip.ZipArchiveEntry entry;
 151                 internal ZipArchiveEntryStream openStream;
 152         internal bool wasWritten;
 153                 private bool wasDeleted;
 154
 155                 internal ZipArchiveEntry(ZipArchive     archive, SharpCompress.Archive.Zip.ZipArchiveEntry entry)
 156                 {
 157                         if (archive == null)
 158                                 throw new ArgumentNullException("archive");
 159
 160                         if (entry == null)
 161                                 throw new ArgumentNullException("entry");
 162
 163                         Archive = archive;
 164                         this.entry = entry;
 165                 }
 166
 167                 public ZipArchive Archive {
 168                         get;
 169                         private set;
 170                 }
 171
 172                 public long CompressedLength {
 173                         get {
 174                                 if (Archive.Mode == ZipArchiveMode.Create)
 175                                         throw new InvalidOperationException("Property cannot be retrieved when the mode is set to Create");
 176
 177                                 return entry.CompressedSize;
 178                         }
 179                 }
 180
 181                 public string FullName {
 182                         get { return entry.Key; }
 183                 }
 184
 185                 public DateTimeOffset LastWriteTime {
 186                         get { return entry.LastModifiedTime.GetValueOrDefault(); }
 187                         set { entry.LastModifiedTime = value.DateTime; }
 188                 }
 189
 190                 public long Length {
 191                         get {
 192                                 if (Archive.Mode == ZipArchiveMode.Create)
 193                                         throw new InvalidOperationException("Property cannot be retrieved when the mode is set to Create");
 194
 195                                 return entry.Size;
 196                         }
 197                 }
 198
 199                 public string Name {
 200                         get { return Path.GetFileName(entry.Key); }
 201                 }
 202
 203                 public void Delete()
 204                 {
 205                         if (Archive.disposed)
 206                                 throw new ObjectDisposedException("The zip archive for this entry has been disposed.");
 207
 208                         if (Archive.Mode != ZipArchiveMode.Update)
 209                                 throw new NotSupportedException("The zip archive for this entry was opened in a mode other than Update.");
 210
 211                         if (openStream != null)
 212                                 throw new IOException("The entry is already open for reading or writing.");
 213
 214                         wasDeleted = true;
 215                         Archive.zipFile.RemoveEntry(entry);
 216                 }
 217
 218                 public Stream Open()
 219                 {
 220                         if (Archive.disposed)
 221                                 throw new ObjectDisposedException("The zip archive for this entry has been disposed.");
 222
 223                         if (openStream != null && Archive.Mode == ZipArchiveMode.Update)
 224                                 throw new IOException("The entry is already currently open for writing.");
 225
 226                         if (wasDeleted)
 227                                 throw new IOException("The entry has been deleted from the archive.");
 228
 229                         if (Archive.Mode == ZipArchiveMode.Create && openStream != null)
 230                                 throw new IOException("The archive for this entry was opened with the Create mode, and this entry has already been written to.");
 231
 232                         var entryStream = entry.OpenEntryStream();
 233                         openStream = new ZipArchiveEntryStream(this, entryStream);
 234
 235                         return openStream;
 236                 }
 237
 238                 public override string ToString()
 239                 {
 240                         return FullName;
 241                 }
 242         }
 243 }