public Stream GetContent(PackageEntry entry)
{
Stream parentStream;
var offset = dataStart + entry.Offset + SegmentStream.GetOverallNestedOffset(s, out parentStream);
var path = ((FileStream)parentStream).Name;
return(new SegmentStream(File.OpenRead(path), offset, entry.Length));
}
public Stream GetContent(uint hash)
{
PackageEntry e;
if (!index.TryGetValue(hash, out e))
{
return(null);
}
Stream parentStream;
var offset = dataStart + e.Offset + SegmentStream.GetOverallNestedOffset(s, out parentStream);
var path = ((FileStream)parentStream).Name;
return(new SegmentStream(File.OpenRead(path), offset, e.Length));
}
public Stream GetContent(PackageEntry entry)
{
Stream parentStream;
var baseOffset = dataStart + entry.Offset;
var nestedOffset = baseOffset + SegmentStream.GetOverallNestedOffset(s, out parentStream);
// Special case FileStream - instead of creating an in-memory copy,
// just reference the portion of the on-disk file that we need to save memory.
// We use GetType instead of 'is' here since we can't handle any derived classes of FileStream.
if (parentStream.GetType() == typeof(FileStream))
{
var path = ((FileStream)parentStream).Name;
return(new SegmentStream(File.OpenRead(path), nestedOffset, entry.Length));
}
// For all other streams, create a copy in memory.
// This uses more memory but is the only way in general to ensure the returned streams won't clash.
s.Seek(baseOffset, SeekOrigin.Begin);
return(new MemoryStream(s.ReadBytes((int)entry.Length)));
}