public Stream Open()
{
if (this.Archive.AccessMode == StreamAccessMode.Sequential)
{
Stream output = this.stream;
this.stream = null;
if (output == null)
{
throw new IOException("The entry is currently open or has been closed. It cannot be reopened.");
}
else
{
return(output);
}
}
else if (this.Archive.AccessMode == StreamAccessMode.Random)
{
return(Archive.BlockManager.OpenStream(index));
}
else
{
throw new NotImplementedException("Unknown access mode");
}
}
internal Stream OpenStream(int index)
{
lock (this)
{
if (index < 0 || index >= this.realEntries.Count)
{
throw new ArgumentOutOfRangeException("index");
}
TarIOEntry entry = realEntries[index];
if (entry.Stream != null && entry.Stream.Closed)
{
throw new InvalidOperationException(
"A stream for the requested resouce is already open");
}
else
{
var @return = new TarIOFileItemStream(entry.Offset, entry.Length, this);
realEntries[index].Stream = @return;
return(@return);
}
}
}
internal void SaveEntry(TarIOFileItemStream stream)
{
lock (this)
{
// Alloc space
long dataLength = stream.Length - stream.PhysicalLength; // Length of suffix
long allocLength = (dataLength + BLOCK_SIZE - 1) & (-BLOCK_SIZE); // Block-adjusted length of suffix
if (dataLength == 0)
{
return; // Skip if all data is already in the stream
}
if (allocLength == 0)
{
allocLength = BLOCK_SIZE; // If dataLength < BLOCK_SIZE, round alloc length to BLOCK_SIZE
}
// Make space for the new data
Move(stream.Offset + stream.PhysicalLength, allocLength);
// Save stream
stream.SaveToPhysical();
// Update positions
foreach (TarIOEntry entry in realEntries)
{
if (entry.Offset > stream.Offset)
{
entry.Offset += allocLength;
}
else if (f.Item1 == stream.Offset)
{
f.Item2 += dataLength;
}
}
}
}
internal TarArchiveEntry(TarArchive archive, TarIOFileHeader header, TarIOFileItemStream stream)
: this(archive, header)
{
this.stream = stream;
}
