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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using SharpCompress.Common;
using SharpCompress.Reader;
namespace SharpCompress.Archive
{
internal abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtractionListener
where TEntry : IArchiveEntry
where TVolume : IVolume
{
private readonly LazyReadOnlyCollection<TVolume> lazyVolumes;
private readonly LazyReadOnlyCollection<TEntry> lazyEntries;
public event EventHandler<ArchiveExtractionEventArgs<IArchiveEntry>> EntryExtractionBegin;
public event EventHandler<ArchiveExtractionEventArgs<IArchiveEntry>> EntryExtractionEnd;
public event EventHandler<CompressedBytesReadEventArgs> CompressedBytesRead;
public event EventHandler<FilePartExtractionBeginEventArgs> FilePartExtractionBegin;
protected string Password { get; private set; }
#if !PORTABLE && !NETFX_CORE
internal AbstractArchive(ArchiveType type, FileInfo fileInfo, Options options, string password)
{
Type = type;
Password = password;
if (!fileInfo.Exists)
{
throw new ArgumentException("File does not exist: " + fileInfo.FullName);
}
options = (Options) FlagUtility.SetFlag(options, Options.KeepStreamsOpen, false);
lazyVolumes = new LazyReadOnlyCollection<TVolume>(LoadVolumes(fileInfo, options));
lazyEntries = new LazyReadOnlyCollection<TEntry>(LoadEntries(Volumes));
}
protected abstract IEnumerable<TVolume> LoadVolumes(FileInfo file, Options options);
#endif
internal AbstractArchive(ArchiveType type, IEnumerable<Stream> streams, Options options, string password)
{
Type = type;
Password = password;
lazyVolumes = new LazyReadOnlyCollection<TVolume>(LoadVolumes(streams.Select(CheckStreams), options));
lazyEntries = new LazyReadOnlyCollection<TEntry>(LoadEntries(Volumes));
}
internal AbstractArchive(ArchiveType type)
{
Type = type;
lazyVolumes = new LazyReadOnlyCollection<TVolume>(Enumerable.Empty<TVolume>());
lazyEntries = new LazyReadOnlyCollection<TEntry>(Enumerable.Empty<TEntry>());
}
public ArchiveType Type { get; private set; }
void IArchiveExtractionListener.FireEntryExtractionBegin(IArchiveEntry entry)
{
if (EntryExtractionBegin != null)
{
EntryExtractionBegin(this, new ArchiveExtractionEventArgs<IArchiveEntry>(entry));
}
}
void IArchiveExtractionListener.FireEntryExtractionEnd(IArchiveEntry entry)
{
if (EntryExtractionEnd != null)
{
EntryExtractionEnd(this, new ArchiveExtractionEventArgs<IArchiveEntry>(entry));
}
}
private static Stream CheckStreams(Stream stream)
{
if (!stream.CanSeek || !stream.CanRead)
{
throw new ArgumentException("Archive streams must be Readable and Seekable");
}
return stream;
}
/// <summary>
/// Returns an ReadOnlyCollection of all the RarArchiveEntries across the one or many parts of the RarArchive.
/// </summary>
/// <returns></returns>
public virtual ICollection<TEntry> Entries
{
get { return lazyEntries; }
}
/// <summary>
/// Returns an ReadOnlyCollection of all the RarArchiveVolumes across the one or many parts of the RarArchive.
/// </summary>
/// <returns></returns>
public ICollection<TVolume> Volumes
{
get { return lazyVolumes; }
}
/// <summary>
/// The total size of the files compressed in the archive.
/// </summary>
public long TotalSize
{
get { return Entries.Aggregate(0L, (total, cf) => total + cf.CompressedSize); }
}
protected abstract IEnumerable<TVolume> LoadVolumes(IEnumerable<Stream> streams, Options options);
protected abstract IEnumerable<TEntry> LoadEntries(IEnumerable<TVolume> volumes);
IEnumerable<IArchiveEntry> IArchive.Entries
{
get { return Entries.Cast<IArchiveEntry>(); }
}
IEnumerable<IVolume> IArchive.Volumes
{
get { return lazyVolumes.Cast<IVolume>(); }
}
private bool disposed;
public virtual void Dispose()
{
if (!disposed)
{
lazyVolumes.ForEach(v => v.Dispose());
lazyEntries.GetLoaded().Cast<Entry>().ForEach(x => x.Close());
disposed = true;
}
}
void IArchiveExtractionListener.EnsureEntriesLoaded()
{
lazyEntries.EnsureFullyLoaded();
lazyVolumes.EnsureFullyLoaded();
}
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,
});
}
}
/// <summary>
/// Use this method to extract all entries in an archive in order.
/// This is primarily for SOLID Rar Archives or 7Zip Archives as they need to be
/// extracted sequentially for the best performance.
///
/// This method will load all entry information from the archive.
///
/// WARNING: this will reuse the underlying stream for the archive. Errors may
/// occur if this is used at the same time as other extraction methods on this instance.
/// </summary>
/// <returns></returns>
public IReader ExtractAllEntries()
{
((IArchiveExtractionListener)this).EnsureEntriesLoaded();
return CreateReaderForSolidExtraction();
}
protected abstract IReader CreateReaderForSolidExtraction();
/// <summary>
/// Archive is SOLID (this means the Archive saved bytes by reusing information which helps for archives containing many small files).
/// </summary>
public virtual bool IsSolid
{
get { return false; }
}
/// <summary>
/// The archive can find all the parts of the archive needed to fully extract the archive. This forces the parsing of the entire archive.
/// </summary>
public bool IsComplete
{
get
{
((IArchiveExtractionListener)this).EnsureEntriesLoaded();
return Entries.All(x => x.IsComplete);
}
}
}
}
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