private ArchiveMetadata ReadArchive()
{
var token = ReadToken();
if (token == ArchiveMetadataToken.ArchiveProperties)
{
ReadArchiveProperties();
token = ReadToken();
}
var streams = ImmutableArray <Stream> .Empty;
if (token == ArchiveMetadataToken.AdditionalStreams)
{
streams = ReadPackedStreams();
token = ReadToken();
}
ArchiveMetadata metadata;
if (token == ArchiveMetadataToken.MainStreams)
{
metadata = ReadMetadata(streams, true);
token = ReadToken();
}
else
{
throw new NotImplementedException();
}
int?emptyStreamCount = null;
if (token != ArchiveMetadataToken.End)
{
if (token != ArchiveMetadataToken.Files)
{
throw new InvalidDataException();
}
var fileCount = ReadNumberAsInt32();
Initialize(fileCount);
for (;;)
{
token = ReadToken();
if (token == ArchiveMetadataToken.End)
{
break;
}
var recordSize = (long)ReadNumber();
if (recordSize < 0)
{
throw new InvalidDataException();
}
var oldOffset = GetCurrentOffset();
#region File Metadata
switch (token)
{
case ArchiveMetadataToken.Name:
using (SelectStream(streams))
{
var reader = new MetadataStringReader(this, fileCount);
ReadNames(reader);
reader.Complete();
}
break;
case ArchiveMetadataToken.WinAttributes:
{
var vector = ReadOptionalBitVector(fileCount);
using (SelectStream(streams))
{
var reader = new MetadataAttributeReader(this, fileCount, vector, EnablePosixFileAttributeExtension);
ReadAttributes(reader);
reader.Complete();
}
break;
}
case ArchiveMetadataToken.EmptyStream:
{
var emptyStreams = ReadRequiredBitVector(fileCount);
emptyStreamCount = emptyStreams.CountSetBits();
var reader = new MetadataBitReader(this, emptyStreams);
ReadEmptyStreamMarkers(reader);
reader.Complete();
break;
}
case ArchiveMetadataToken.EmptyFile:
{
if (emptyStreamCount == null)
{
throw new InvalidDataException();
}
var reader = new MetadataBitReader(this, ReadRequiredBitVector(emptyStreamCount.Value));
ReadEmptyFileMarkers(reader);
reader.Complete();
break;
}
case ArchiveMetadataToken.Anti:
{
if (emptyStreamCount == null)
{
throw new InvalidDataException();
}
var reader = new MetadataBitReader(this, ReadRequiredBitVector(emptyStreamCount.Value));
ReadRemovedFileMarkers(reader);
reader.Complete();
break;
}
case ArchiveMetadataToken.StartPos:
{
var vector = ReadOptionalBitVector(fileCount);
using (SelectStream(streams))
{
var reader = new MetadataNumberReader(this, fileCount, vector);
ReadOffsets(reader);
reader.Complete();
}
break;
}
case ArchiveMetadataToken.CTime:
{
var vector = ReadOptionalBitVector(fileCount);
using (SelectStream(streams))
{
var reader = new MetadataDateReader(this, fileCount, vector);
ReadCTime(reader);
reader.Complete();
}
break;
}
case ArchiveMetadataToken.ATime:
{
var vector = ReadOptionalBitVector(fileCount);
using (SelectStream(streams))
{
var reader = new MetadataDateReader(this, fileCount, vector);
ReadATime(reader);
reader.Complete();
}
break;
}
case ArchiveMetadataToken.MTime:
{
var vector = ReadOptionalBitVector(fileCount);
using (SelectStream(streams))
{
var reader = new MetadataDateReader(this, fileCount, vector);
ReadMTime(reader);
reader.Complete();
}
break;
}
case ArchiveMetadataToken.Padding:
// TODO: what does the reference implementation do here? just skip it? then we shouldn't throw an exception!
for (int i = 0; i < recordSize; i++)
{
if (ReadByte() != 0)
{
throw new InvalidDataException();
}
}
break;
default:
// TODO: skip data
break;
}
#endregion
// Up until version 0.3 there was a bug which could emit invalid record sizes, but it didn't really matter.
// Starting from version 0.3 there have been extensions to the file format which require correct record sizes.
if (!(mMajorVersion == 0 && mMinorVersion < 3))
{
var newOffset = GetCurrentOffset();
if (newOffset - oldOffset != recordSize)
{
throw new InvalidDataException();
}
}
}
}
return(metadata);
}
protected virtual void ReadAttributes(MetadataAttributeReader data)
{
}