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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using SharpCompress.Common;
#if PORTABLE
using SharpCompress.Common.Rar.Headers;
#endif
namespace SharpCompress.Reader
{
/// <summary>
/// A generic push reader that reads unseekable comrpessed streams.
/// </summary>
internal abstract class AbstractReader<TEntry, TVolume> : IReader, IExtractionListener
where TEntry : Entry
where TVolume : Volume
{
private bool completed;
private IEnumerator<TEntry> entriesForCurrentReadStream;
private bool wroteCurrentEntry;
public event EventHandler<CompressedBytesReadEventArgs> CompressedBytesRead;
public event EventHandler<FilePartExtractionBeginEventArgs> FilePartExtractionBegin;
internal AbstractReader(Options options, ArchiveType archiveType)
{
ArchiveType = archiveType;
Options = options;
}
internal Options Options { get; private set; }
public ArchiveType ArchiveType { get; private set; }
/// <summary>
/// Current volume that the current entry resides in
/// </summary>
public abstract TVolume Volume { get; }
/// <summary>
/// Current file entry
/// </summary>
public TEntry Entry
{
get { return entriesForCurrentReadStream.Current; }
}
#region IDisposable Members
public void Dispose()
{
if (entriesForCurrentReadStream != null)
{
entriesForCurrentReadStream.Dispose();
}
Volume.Dispose();
}
#endregion
public bool MoveToNextEntry()
{
if (completed)
{
return false;
}
if (entriesForCurrentReadStream == null)
{
return LoadStreamForReading(RequestInitialStream());
}
if (!wroteCurrentEntry)
{
SkipEntry();
}
wroteCurrentEntry = false;
if (NextEntryForCurrentStream())
{
return true;
}
completed = true;
return false;
}
internal bool LoadStreamForReading(Stream stream)
{
if (entriesForCurrentReadStream != null)
{
entriesForCurrentReadStream.Dispose();
}
if ((stream == null) || (!stream.CanRead))
{
throw new MultipartStreamRequiredException("File is split into multiple archives: '"
+ Entry.Key +
"'. A new readable stream is required. Use Cancel if it was intended.");
}
entriesForCurrentReadStream = GetEntries(stream).GetEnumerator();
if (entriesForCurrentReadStream.MoveNext())
{
return true;
}
return false;
}
internal virtual Stream RequestInitialStream()
{
return Volume.Stream;
}
internal virtual bool NextEntryForCurrentStream()
{
return entriesForCurrentReadStream.MoveNext();
}
internal abstract IEnumerable<TEntry> GetEntries(Stream stream);
#region Entry Skip/Write
private void SkipEntry()
{
if (!Entry.IsDirectory)
{
Skip();
}
}
private readonly byte[] skipBuffer = new byte[4096];
private void Skip()
{
if (!Entry.IsSolid)
{
var rawStream = Entry.Parts.First().GetRawStream();
if (rawStream != null)
{
var bytesToAdvance = Entry.CompressedSize;
for (var i = 0; i < bytesToAdvance / skipBuffer.Length; i++)
{
rawStream.Read(skipBuffer, 0, skipBuffer.Length);
}
rawStream.Read(skipBuffer, 0, (int)(bytesToAdvance % skipBuffer.Length));
return;
}
}
using (var s = OpenEntryStream())
{
while (s.Read(skipBuffer, 0, skipBuffer.Length) > 0)
{
}
}
}
public void WriteEntryTo(Stream writableStream)
{
if (wroteCurrentEntry)
{
throw new ArgumentException("WriteEntryTo or OpenEntryStream can only be called once.");
}
if ((writableStream == null) || (!writableStream.CanWrite))
{
throw new ArgumentNullException(
"A writable Stream was required. Use Cancel if that was intended.");
}
Write(writableStream);
wroteCurrentEntry = true;
}
internal void Write(Stream writeStream)
{
using (Stream s = OpenEntryStream())
{
s.TransferTo(writeStream);
}
}
public EntryStream OpenEntryStream()
{
if (wroteCurrentEntry)
{
throw new ArgumentException("WriteEntryTo or OpenEntryStream can only be called once.");
}
var stream = GetEntryStream();
wroteCurrentEntry = true;
return stream;
}
protected virtual EntryStream GetEntryStream()
{
return new EntryStream(Entry.Parts.First().GetCompressedStream());
}
#endregion
IEntry IReader.Entry
{
get { return Entry; }
}
void IExtractionListener.FireCompressedBytesRead(long currentPartCompressedBytes, long compressedReadBytes)
{
if (CompressedBytesRead != null)
{
CompressedBytesRead(this, new CompressedBytesReadEventArgs()
{
CurrentFilePartCompressedBytesRead = currentPartCompressedBytes,
CompressedBytesRead = compressedReadBytes
});
}
}
void IExtractionListener.FireFilePartExtractionBegin(string name, long size, long compressedSize)
{
if (FilePartExtractionBegin != null)
{
FilePartExtractionBegin(this, new FilePartExtractionBeginEventArgs()
{
CompressedSize = compressedSize,
Size = size,
Name = name,
});
}
}
}
}
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