/// <summary>
/// Initializes a new instance of the <see cref="DiskArchiveStorage" /> class.
/// </summary>
/// <param name="file">The file.</param>
public DiskArchiveStorage(ZipFile file)
: this(file, FileUpdateMode.Safe) {}
/// <summary>
/// Extract the contents of a zip file.
/// </summary>
/// <param name="zipFileName">The zip file to extract from.</param>
/// <param name="targetDirectory">The directory to save extracted information in.</param>
/// <param name="overwrite">The style of <see cref="Overwrite">overwriting</see> to apply.</param>
/// <param name="confirmDelegate">A delegate to invoke when confirming overwriting.</param>
/// <param name="fileFilter">A filter to apply to files.</param>
/// <param name="directoryFilter">A filter to apply to directories.</param>
/// <param name="restoreDateTime">Flag indicating wether to restore the date and time for extracted files.</param>
public void ExtractZip(string zipFileName, string targetDirectory, string fileFilter, string directoryFilter)
{
continueRunning_ = true;
extractNameTransform_ = new WindowsNameTransform(targetDirectory);
fileFilter_ = new NameFilter(fileFilter);
directoryFilter_ = new NameFilter(directoryFilter);
using (zipFile_ = new ZipFile(zipFileName))
{
var enumerator = zipFile_.GetEnumerator();
while (continueRunning_ && enumerator.MoveNext())
{
var entry = (ZipEntry) enumerator.Current;
if (entry.IsFile)
{
// TODO Path.GetDirectory can fail here on invalid characters.
if (directoryFilter_.IsMatch(Path.GetDirectoryName(entry.Name)) && fileFilter_.IsMatch(entry.Name))
{
ExtractEntry(entry);
}
}
}
}
}
/// <summary>
/// Initialise a new instance of the <see cref="PartialInputStream" /> class.
/// </summary>
/// <param name="zipFile">The <see cref="ZipFile" /> containing the underlying stream to use for IO.</param>
/// <param name="start">The start of the partial data.</param>
/// <param name="length">The length of the partial data.</param>
public PartialInputStream(ZipFile zipFile, long start, long length)
{
start_ = start;
length_ = length;
// Although this is the only time the zipfile is used
// keeping a reference here prevents premature closure of
// this zip file and thus the baseStream_.
// Code like this will cause apparently random failures depending
// on the size of the files and when garbage is collected.
//
// ZipFile z = new ZipFile (stream);
// Stream reader = z.GetInputStream(0);
// uses reader here....
baseStream_ = zipFile.baseStream_;
readPos_ = start;
end_ = start + length;
}
/// <summary>
/// Initializes a new instance of the <see cref="DiskArchiveStorage" /> class.
/// </summary>
/// <param name="file">The file.</param>
/// <param name="updateMode">The update mode.</param>
public DiskArchiveStorage(ZipFile file, FileUpdateMode updateMode)
: base(updateMode)
{
if (file.Name == null)
{
throw new ZipException("Cant handle non file archives");
}
fileName_ = file.Name;
}
/// <summary>
/// Create a new <see cref="ZipFile" /> whose data will be stored on a stream.
/// </summary>
/// <param name="outStream">The stream providing data storage.</param>
/// <returns>Returns the newly created <see cref="ZipFile" /></returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="outStream"> is null</paramref>
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="outStream"> doesnt support writing.</paramref>
/// </exception>
public static ZipFile Create(Stream outStream)
{
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
if (!outStream.CanWrite)
{
throw new ArgumentException("Stream is not writeable", "outStream");
}
if (!outStream.CanSeek)
{
throw new ArgumentException("Stream is not seekable", "outStream");
}
var result = new ZipFile();
result.baseStream_ = outStream;
return result;
}
private void CopyEntry(ZipFile workFile, ZipUpdate update)
{
workFile.WriteLocalEntryHeader(update);
if (update.Entry.CompressedSize > 0)
{
const int NameLengthOffset = 26;
var entryDataOffset = update.Entry.Offset + NameLengthOffset;
// TODO: This wont work for SFX files!
baseStream_.Seek(entryDataOffset, SeekOrigin.Begin);
uint nameLength = ReadLEUshort();
uint extraLength = ReadLEUshort();
baseStream_.Seek(nameLength + extraLength, SeekOrigin.Current);
CopyBytes(update, workFile.baseStream_, baseStream_, update.Entry.CompressedSize, false);
}
CopyDescriptorBytes(update, workFile.baseStream_, baseStream_);
}
private void CopyEntryDirect(ZipFile workFile, ZipUpdate update, ref long destinationPosition)
{
var skipOver = false;
if (update.Entry.Offset == destinationPosition)
{
skipOver = true;
}
if (!skipOver)
{
baseStream_.Position = destinationPosition;
workFile.WriteLocalEntryHeader(update);
destinationPosition = baseStream_.Position;
}
const int NameLengthOffset = 26;
// TODO: Add base for SFX friendly handling
var entryDataOffset = update.Entry.Offset + NameLengthOffset;
baseStream_.Seek(entryDataOffset, SeekOrigin.Begin);
// Clumsy way of handling retrieving the original name and extra data length for now.
// TODO: Stop re-reading name and data length in CopyEntryDirect.
uint nameLength = ReadLEUshort();
uint extraLength = ReadLEUshort();
var sourcePosition = baseStream_.Position + nameLength + extraLength;
if (skipOver)
{
destinationPosition +=
(sourcePosition - entryDataOffset) + NameLengthOffset + // Header size
update.Entry.CompressedSize + GetDescriptorSize(update);
}
else
{
if (update.Entry.CompressedSize > 0)
{
CopyEntryDataDirect(update, baseStream_, false, ref destinationPosition, ref sourcePosition);
}
CopyDescriptorBytesDirect(update, baseStream_, ref destinationPosition, sourcePosition);
}
}
private static void ModifyEntry(ZipFile workFile, ZipUpdate update)
{
workFile.WriteLocalEntryHeader(update);
var dataStart = workFile.baseStream_.Position;
var dataEnd = workFile.baseStream_.Position;
update.Entry.CompressedSize = dataEnd - dataStart;
}
private void AddEntry(ZipFile workFile, ZipUpdate update)
{
Stream source = null;
if (update.Entry.IsFile)
{
source = update.GetSource();
if (source == null)
{
source = updateDataSource_.GetSource(update.Entry, null);
}
}
if (source != null)
{
using (source)
{
var sourceStreamLength = source.Length;
if (update.OutEntry.Size < 0)
{
update.OutEntry.Size = sourceStreamLength;
}
else
{
// Check for errant entries.
if (update.OutEntry.Size != sourceStreamLength)
{
throw new ZipException("Entry size/stream size mismatch");
}
}
workFile.WriteLocalEntryHeader(update);
var dataStart = workFile.baseStream_.Position;
using (var output = workFile.GetOutputStream(update.OutEntry))
{
CopyBytes(update, output, source, sourceStreamLength, true);
}
var dataEnd = workFile.baseStream_.Position;
update.OutEntry.CompressedSize = dataEnd - dataStart;
if ((update.OutEntry.Flags & (int) GeneralBitFlags.Descriptor) == (int) GeneralBitFlags.Descriptor)
{
var helper = new ZipHelperStream(workFile.baseStream_);
helper.WriteDataDescriptor(update.OutEntry);
}
}
}
else
{
workFile.WriteLocalEntryHeader(update);
update.OutEntry.CompressedSize = 0;
}
}
