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.CanWrite ? stream.Length : entry.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                         stream.Write(buffer, offset, count);
  99                 }
 100
 101                 internal void EnsureWriteable()
 102                 {
 103                         if (entry.Archive.Mode == ZipArchiveMode.Update && !stream.CanWrite)
 104                         {
 105                                 // Replace the read-only stream with a writeable memory stream.
 106                                 SetWriteable();
 107                         }
 108                 }
 109
 110                 internal void SetWriteable()
 111                 {
 112                         var archive = entry.Archive;
 113
 114                         var internalEntry = entry.entry;
 115                         var newEntry = archive.CreateEntryInternal(internalEntry.Key);
 116                         var newStream = newEntry.OpenEntryStream();
 117
 118                         var openStream = stream;
 119                         openStream.CopyTo(newStream);
 120                         openStream.Dispose();
 121
 122                         newStream.Position = 0;
 123
 124                         archive.zipFile.RemoveEntry(internalEntry);
 125                         entry.entry = newEntry;
 126                         stream = newStream;
 127                 }
 128
 129                 public new void Dispose()
 130                 {
 131                         Dispose(true);
 132                         GC.SuppressFinalize(this);
 133                         base.Dispose();
 134                 }
 135
 136                 protected override void Dispose(bool disposing)
 137                 {
 138                         if (disposing)
 139                         {
 140                                 entry.openStream = null;
 141                                 stream.Dispose();
 142                         }
 143                 }
 144         }
 145
 146         public class ZipArchiveEntry
 147         {
 148                 internal SharpCompress.Archive.Zip.ZipArchiveEntry entry;
 149                 internal ZipArchiveEntryStream openStream;
 150         internal bool wasWritten;
 151                 private bool wasDeleted;
 152
 153                 internal ZipArchiveEntry(ZipArchive     archive, SharpCompress.Archive.Zip.ZipArchiveEntry entry)
 154                 {
 155                         if (archive == null)
 156                                 throw new ArgumentNullException("archive");
 157
 158                         if (entry == null)
 159                                 throw new ArgumentNullException("entry");
 160
 161                         Archive = archive;
 162                         this.entry = entry;
 163                 }
 164
 165                 public ZipArchive Archive {
 166                         get;
 167                         private set;
 168                 }
 169
 170                 public long CompressedLength {
 171                         get {
 172                                 if (Archive.Mode == ZipArchiveMode.Create)
 173                                         throw new InvalidOperationException("Property cannot be retrieved when the mode is set to Create");
 174
 175                                 return entry.CompressedSize;
 176                         }
 177                 }
 178
 179                 public string FullName {
 180                         get { return entry.Key; }
 181                 }
 182
 183                 public DateTimeOffset LastWriteTime {
 184                         get { return entry.LastModifiedTime.GetValueOrDefault(); }
 185                         set { entry.LastModifiedTime = value.DateTime; }
 186                 }
 187
 188                 public long Length {
 189                         get {
 190                                 if (Archive.Mode == ZipArchiveMode.Create)
 191                                         throw new InvalidOperationException("Property cannot be retrieved when the mode is set to Create");
 192
 193                                 return entry.Size;
 194                         }
 195                 }
 196
 197                 public string Name {
 198                         get { return Path.GetFileName(entry.Key); }
 199                 }
 200
 201                 public void Delete()
 202                 {
 203                         if (Archive.disposed)
 204                                 throw new ObjectDisposedException("The zip archive for this entry has been disposed.");
 205
 206                         if (Archive.Mode != ZipArchiveMode.Update)
 207                                 throw new NotSupportedException("The zip archive for this entry was opened in a mode other than Update.");
 208
 209                         if (openStream != null)
 210                                 throw new IOException("The entry is already open for reading or writing.");
 211
 212                         wasDeleted = true;
 213                         Archive.RemoveEntryInternal(this);
 214                 }
 215
 216                 public Stream Open()
 217                 {
 218                         if (Archive.disposed)
 219                                 throw new ObjectDisposedException("The zip archive for this entry has been disposed.");
 220
 221                         if (openStream != null && Archive.Mode == ZipArchiveMode.Update)
 222                                 throw new IOException("The entry is already currently open for writing.");
 223
 224                         if (wasDeleted)
 225                                 throw new IOException("The entry has been deleted from the archive.");
 226
 227                         if (Archive.Mode == ZipArchiveMode.Create && openStream != null)
 228                                 throw new IOException("The archive for this entry was opened with the Create mode, and this entry has already been written to.");
 229
 230                         var entryStream = entry.OpenEntryStream();
 231                         openStream = new ZipArchiveEntryStream(this, entryStream);
 232                         openStream.EnsureWriteable();
 233
 234                         return openStream;
 235                 }
 236
 237                 public override string ToString()
 238                 {
 239                         return FullName;
 240                 }
 241         }
 242 }