/// <summary>
/// Reads one <c>ZipEntry</c> from the given stream. The content for
/// the entry does not get decompressed or decrypted. This method
/// basically reads metadata, and seeks.
/// </summary>
/// <param name="zc">the ZipContainer this entry belongs to.</param>
/// <param name="first">
/// true of this is the first entry being read from the stream.
/// </param>
/// <returns>the <c>ZipEntry</c> read from the stream.</returns>
internal static ZipEntry ReadEntry(ZipContainer zc, bool first)
{
Stream s = zc.ReadStream;
System.Text.Encoding defaultEncoding = zc.AlternateEncoding;
ZipEntry entry = new ZipEntry();
entry._Source = ZipEntrySource.ZipFile;
entry._container = zc;
entry._archiveStream = s;
if (first) HandlePK00Prefix(s);
// Read entry header, including any encryption header
if (!ReadHeader(entry, defaultEncoding)) return null;
// Store the position in the stream for this entry
// change for workitem 8098
entry.__FileDataPosition = entry.ArchiveStream.Position;
// seek past the data without reading it. We will read on Extract()
s.Seek(entry._CompressedFileDataSize + entry._LengthOfTrailer, SeekOrigin.Current);
// ReadHeader moves the file pointer to the end of the entry header,
// as well as any encryption header.
// CompressedFileDataSize includes:
// the maybe compressed, maybe encrypted file data
// the encryption trailer, if any
// the bit 3 descriptor, if any
// workitem 5306
// http://www.codeplex.com/DotNetZip/WorkItem/View.aspx?WorkItemId=5306
HandleUnexpectedDataDescriptor(entry);
return entry;
}
// build the TOC by reading each entry in the file.
private static void ReadIntoInstance_Orig(ZipFile zf)
{
//zf._entries = new System.Collections.Generic.List<ZipEntry>();
zf._entries = new System.Collections.Generic.Dictionary <String, ZipEntry>();
ZipEntry e;
// work item 6647: PK00 (packed to removable disk)
bool firstEntry = true;
ZipContainer zc = new ZipContainer(zf);
while ((e = ZipEntry.ReadEntry(zc, firstEntry)) != null)
{
zf._entries.Add(e.FileName, e);
firstEntry = false;
}
// read the zipfile's central directory structure here.
// workitem 9912
// But, because it may be corrupted, ignore errors.
try
{
ZipEntry de;
// in lieu of hashset, use a dictionary
var previouslySeen = new Dictionary <String, Object>();
while ((de = ZipEntry.ReadDirEntry(zf, previouslySeen)) != null)
{
// Housekeeping: Since ZipFile exposes ZipEntry elements in the enumerator,
// we need to copy the comment that we grab from the ZipDirEntry
// into the ZipEntry, so the application can access the comment.
// Also since ZipEntry is used to Write zip files, we need to copy the
// file attributes to the ZipEntry as appropriate.
ZipEntry e1 = zf._entries[de.FileName];
if (e1 != null)
{
e1._Comment = de.Comment;
if (de.IsDirectory)
{
e1.MarkAsDirectory();
}
}
previouslySeen.Add(de.FileName, null); // to prevent dupes
}
// workitem 8299
if (zf._locEndOfCDS > 0)
{
zf.ReadStream.Seek(zf._locEndOfCDS, SeekOrigin.Begin);
}
ReadCentralDirectoryFooter(zf);
}
catch (ZipException) { }
catch (IOException) { }
}
private void InternalExtractToStream(Stream outStream, string password, ZipContainer zipContainer, ZipEntrySource zipEntrySource, string fileName)
{
// workitem 7958
if (zipContainer == null)
{
throw new BadStateException("This entry is an orphan");
}
// workitem 10355
if (zipContainer.ZipFile == null)
{
throw new InvalidOperationException("Use Extract() only with ZipFile.");
}
if (zipEntrySource != ZipEntrySource.ZipFile)
{
throw new BadStateException("You must call ZipFile.Save before calling any Extract method");
}
_ioOperationCanceled = false;
try
{
ValidateCompression(_CompressionMethod_FromZipFile, fileName, GetUnsupportedCompressionMethod(_CompressionMethod));
ValidateEncryption(Encryption, fileName, _UnsupportedAlgorithmId);
if (IsDoneWithOutputToStream())
{
return;
}
// If no password explicitly specified, use the password on the entry itself,
// or on the zipfile itself.
if (_Encryption_FromZipFile != EncryptionAlgorithm.None)
{
EnsurePassword(password);
}
if (ExtractToStream(ArchiveStream, outStream, Encryption, _Crc32))
{
goto ExitTry;
}
ExitTry :;
}
catch (Exception)
{
_ioOperationCanceled = true;
throw;
}
}
/// <summary>
/// Reads one <c>ZipEntry</c> from the given stream. The content for
/// the entry does not get decompressed or decrypted. This method
/// basically reads metadata, and seeks.
/// </summary>
/// <param name="zc">the ZipContainer this entry belongs to.</param>
/// <param name="first">
/// true of this is the first entry being read from the stream.
/// </param>
/// <returns>the <c>ZipEntry</c> read from the stream.</returns>
internal static ZipEntry ReadEntry(ZipContainer zc, bool first)
{
Stream s = zc.ReadStream;
System.Text.Encoding defaultEncoding = zc.AlternateEncoding;
ZipEntry entry = new ZipEntry();
entry._Source = ZipEntrySource.ZipFile;
entry._container = zc;
entry._archiveStream = s;
if (first)
{
HandlePK00Prefix(s);
}
// Read entry header, including any encryption header
if (!ReadHeader(entry, defaultEncoding))
{
return(null);
}
// Store the position in the stream for this entry
// change for workitem 8098
entry.__FileDataPosition = entry.ArchiveStream.Position;
// seek past the data without reading it. We will read on Extract()
s.Seek(entry._CompressedFileDataSize + entry._LengthOfTrailer, SeekOrigin.Current);
// ReadHeader moves the file pointer to the end of the entry header,
// as well as any encryption header.
// CompressedFileDataSize includes:
// the maybe compressed, maybe encrypted file data
// the encryption trailer, if any
// the bit 3 descriptor, if any
// workitem 5306
// http://www.codeplex.com/DotNetZip/WorkItem/View.aspx?WorkItemId=5306
HandleUnexpectedDataDescriptor(entry);
return(entry);
}
private void InternalExtractToStream(Stream outStream, string password, ZipContainer zipContainer, ZipEntrySource zipEntrySource, string fileName)
{
// workitem 7958
if (zipContainer == null)
throw new BadStateException("This entry is an orphan");
// workitem 10355
if (zipContainer.ZipFile == null)
throw new InvalidOperationException("Use Extract() only with ZipFile.");
if (zipEntrySource != ZipEntrySource.ZipFile)
throw new BadStateException("You must call ZipFile.Save before calling any Extract method");
_ioOperationCanceled = false;
try
{
ValidateCompression(_CompressionMethod_FromZipFile, fileName, GetUnsupportedCompressionMethod(_CompressionMethod));
ValidateEncryption(Encryption, fileName, _UnsupportedAlgorithmId);
if (IsDoneWithOutputToStream())
{
return;
}
// If no password explicitly specified, use the password on the entry itself,
// or on the zipfile itself.
if (_Encryption_FromZipFile != EncryptionAlgorithm.None)
EnsurePassword(password);
if (ExtractToStream(ArchiveStream, outStream, Encryption, _Crc32))
goto ExitTry;
ExitTry: ;
}
catch (Exception)
{
_ioOperationCanceled = true;
throw;
}
}
// build the TOC by reading each entry in the file.
private static void ReadIntoInstance_Orig(ZipFile zf)
{
//zf._entries = new System.Collections.Generic.List<ZipEntry>();
zf._entries = new System.Collections.Generic.Dictionary<String,ZipEntry>();
ZipEntry e;
// work item 6647: PK00 (packed to removable disk)
bool firstEntry = true;
ZipContainer zc = new ZipContainer(zf);
while ((e = ZipEntry.ReadEntry(zc, firstEntry)) != null)
{
zf._entries.Add(e.FileName,e);
firstEntry = false;
}
// read the zipfile's central directory structure here.
// workitem 9912
// But, because it may be corrupted, ignore errors.
try
{
ZipEntry de;
// in lieu of hashset, use a dictionary
var previouslySeen = new Dictionary<String,Object>();
while ((de = ZipEntry.ReadDirEntry(zf, previouslySeen)) != null)
{
// Housekeeping: Since ZipFile exposes ZipEntry elements in the enumerator,
// we need to copy the comment that we grab from the ZipDirEntry
// into the ZipEntry, so the application can access the comment.
// Also since ZipEntry is used to Write zip files, we need to copy the
// file attributes to the ZipEntry as appropriate.
ZipEntry e1 = zf._entries[de.FileName];
if (e1 != null)
{
e1._Comment = de.Comment;
if (de.IsDirectory) e1.MarkAsDirectory();
}
previouslySeen.Add(de.FileName,null); // to prevent dupes
}
// workitem 8299
if (zf._locEndOfCDS > 0)
zf.ReadStream.Seek(zf._locEndOfCDS, SeekOrigin.Begin);
ReadCentralDirectoryFooter(zf);
}
catch (ZipException) { }
catch (IOException) { }
}
