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 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 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)
{
if (update.OffsetBasedSize != -1)
destinationPosition += update.OffsetBasedSize;
else
// TODO: Find out why this calculation comes up 4 bytes short on some entries in ODT (Office Document Text) archives.
// WinZip produces a warning on these entries:
// "caution: value of lrec.csize (compressed size) changed from ..."
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 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;
}
}