/// <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");
}
ZipFile result = new ZipFile();
result.baseStream_ = outStream;
return result;
}
/// <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>
/// Create a new <see cref="ZipFile"/> whose data will be stored in a file.
/// </summary>
/// <param name="fileName">The name of the archive to create.</param>
/// <returns>Returns the newly created <see cref="ZipFile"/></returns>
/// <exception cref="ArgumentNullException"><paramref name="fileName"></paramref> is null</exception>
public static ZipFile Create(string fileName)
{
if ( fileName == null ) {
throw new ArgumentNullException("fileName");
}
FileStream fs = File.Create(fileName);
ZipFile result = new ZipFile();
result.name_ = fileName;
result.baseStream_ = fs;
result.isStreamOwner = true;
return result;
}
/// <summary>
/// Initialize 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....
zipFile_ = zipFile;
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;
}
void CopyEntry(ZipFile workFile, ZipUpdate update)
{
workFile.WriteLocalEntryHeader(update);
if ( update.Entry.CompressedSize > 0 ) {
const int NameLengthOffset = 26;
long 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_);
}
void CopyEntryDirect(ZipFile workFile, ZipUpdate update, ref long destinationPosition)
{
bool skipOver = false;
if ( update.Entry.Offset == destinationPosition ) {
skipOver = true;
}
if ( !skipOver ) {
baseStream_.Position = destinationPosition;
workFile.WriteLocalEntryHeader(update);
destinationPosition = baseStream_.Position;
}
long sourcePosition = 0;
const int NameLengthOffset = 26;
// TODO: Add base for SFX friendly handling
long 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();
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);
}
}
void ModifyEntry(ZipFile workFile, ZipUpdate update)
{
workFile.WriteLocalEntryHeader(update);
long dataStart = workFile.baseStream_.Position;
// TODO: This is slow if the changes don't effect the data!!
if ( update.Entry.IsFile && (update.Filename != null) ) {
using ( Stream output = workFile.GetOutputStream(update.OutEntry) ) {
using ( Stream source = this.GetInputStream(update.Entry) ) {
CopyBytes(update, output, source, source.Length, true);
}
}
}
long dataEnd = workFile.baseStream_.Position;
update.Entry.CompressedSize = dataEnd - dataStart;
}
void AddEntry(ZipFile workFile, ZipUpdate update)
{
Stream source = null;
if ( update.Entry.IsFile ) {
source = update.GetSource();
if ( source == null ) {
source = updateDataSource_.GetSource(update.Entry, update.Filename);
}
}
if ( source != null ) {
using ( source ) {
long 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);
long dataStart = workFile.baseStream_.Position;
using ( Stream output = workFile.GetOutputStream(update.OutEntry) ) {
CopyBytes(update, output, source, sourceStreamLength, true);
}
long dataEnd = workFile.baseStream_.Position;
update.OutEntry.CompressedSize = dataEnd - dataStart;
if ((update.OutEntry.Flags & (int)GeneralBitFlags.Descriptor) == (int)GeneralBitFlags.Descriptor)
{
ZipHelperStream helper = new ZipHelperStream(workFile.baseStream_);
helper.WriteDataDescriptor(update.OutEntry);
}
}
}
else {
workFile.WriteLocalEntryHeader(update);
update.OutEntry.CompressedSize = 0;
}
}
/// <summary>
/// Initialize a new instance of <see cref="TestStatus"/>
/// </summary>
/// <param name="file">The <see cref="ZipFile"/> this status applies to.</param>
public TestStatus(ZipFile file)
{
file_ = file;
}
