private void compressFilesNonSolid(ulong numStreams, Dictionary <ulong, ulong> streamToFileIndex, SevenZipProgressProvider progressProvider)
{
var sc = new SevenZipStreamsCompressor(stream);
sc.Method = Compression.Registry.Method.LZMA;
// actual compression (into a single packed stream per file)
SevenZipStreamsCompressor.PackedStream[] css = new SevenZipStreamsCompressor.PackedStream[numStreams];
ulong numPackStreams = 0;
for (ulong i = 0; i < numStreams; ++i)
{
SevenZipArchiveFile file = _Files[(int)streamToFileIndex[i]];
Trace.TraceInformation($"Compressing `{file.Name}`, Size: `{file.Size} bytes`...");
using (Stream source = file.Source.Get(FileAccess.Read))
css[i] = sc.Compress(source, progressProvider);
numPackStreams += css[i].NumStreams;
}
// build headers
var streamsInfo = this.header.RawHeader.MainStreamsInfo;
streamsInfo.PackInfo = new SevenZipHeader.PackInfo()
{
NumPackStreams = numPackStreams,
PackPos = 0,
Sizes = new UInt64[numPackStreams],
Digests = new SevenZipHeader.Digests(numPackStreams)
};
streamsInfo.UnPackInfo = new SevenZipHeader.UnPackInfo()
{
NumFolders = numStreams,
Folders = new SevenZipHeader.Folder[numStreams]
};
streamsInfo.SubStreamsInfo = new SevenZipHeader.SubStreamsInfo(streamsInfo.UnPackInfo)
{
NumUnPackStreamsInFolders = Enumerable.Repeat((UInt64)1, (int)numStreams).ToArray(),
NumUnPackStreamsTotal = numStreams,
UnPackSizes = new List <UInt64>((int)numStreams),
Digests = new SevenZipHeader.Digests(numStreams)
};
for (ulong i = 0, k = 0; i < numStreams; ++i)
{
for (ulong j = 0; j < css[i].NumStreams; ++j, ++k)
{
streamsInfo.PackInfo.Sizes[k] = css[i].Sizes[j];
streamsInfo.PackInfo.Digests.CRCs[k] = css[i].CRCs[j];
}
streamsInfo.SubStreamsInfo.UnPackSizes.Add((UInt64)css[i].Folder.GetUnPackSize());
streamsInfo.SubStreamsInfo.Digests.CRCs[i] = css[i].Folder.UnPackCRC;
css[i].Folder.UnPackCRC = null;
streamsInfo.UnPackInfo.Folders[i] = css[i].Folder;
}
}
private void compressFilesSolid(ulong numStreams, Dictionary <ulong, ulong> streamToFileIndex, SevenZipProgressProvider progressProvider)
{
var sc = new SevenZipStreamsCompressor(stream);
sc.Method = Compression.Registry.Method.LZMA;
Trace.TraceInformation($"Compressing `{numStreams} files` into a solid block...");
// actual compression using a sequence file stream and stream compressor
var inputStream = new MultiFileStream(
FileAccess.Read,
streamToFileIndex.Select(sfi => _Files[(int)sfi.Value].Source).ToArray());
SevenZipStreamsCompressor.PackedStream cs = sc.Compress(inputStream, progressProvider);
// build headers
var streamsInfo = this.header.RawHeader.MainStreamsInfo;
streamsInfo.PackInfo = new SevenZipHeader.PackInfo()
{
NumPackStreams = cs.NumStreams,
PackPos = 0,
Sizes = cs.Sizes,
Digests = new SevenZipHeader.Digests(cs.NumStreams)
{
CRCs = cs.CRCs
}
};
streamsInfo.UnPackInfo = new SevenZipHeader.UnPackInfo()
{
NumFolders = 1,
Folders = new SevenZipHeader.Folder[1]
{
cs.Folder
}
};
streamsInfo.UnPackInfo.Folders[0].UnPackCRC = null;
streamsInfo.SubStreamsInfo = new SevenZipHeader.SubStreamsInfo(streamsInfo.UnPackInfo)
{
NumUnPackStreamsInFolders = new UInt64[1]
{
numStreams
},
NumUnPackStreamsTotal = numStreams,
UnPackSizes = new List <UInt64>((int)numStreams),
Digests = new SevenZipHeader.Digests(numStreams)
};
for (ulong i = 0; i < numStreams; ++i)
{
streamsInfo.SubStreamsInfo.UnPackSizes.Add((UInt64)inputStream.Sizes[i]);
streamsInfo.SubStreamsInfo.Digests.CRCs[i] = inputStream.CRCs[i];
}
}
private void writeHeaders()
{
// current position is defined as end of packed streams and beginning of header
long endOfPackedStreamsPosition = this.stream.Position;
// write headers in temporary stream
var headerStream = new MemoryStream();
header.Write(headerStream);
// go through compressing again for headers
if (CompressHeader)
{
// get compressor and default codec
var sc = new SevenZipStreamsCompressor(stream);
sc.Method = Compression.Registry.Method.LZMA;
// compress
headerStream.Position = 0;
SevenZipStreamsCompressor.PackedStream cs = sc.Compress(headerStream, null);
// create encoded header
SevenZipHeader.StreamsInfo headerStreamsInfo = new SevenZipHeader.StreamsInfo()
{
PackInfo = new SevenZipHeader.PackInfo()
{
NumPackStreams = cs.NumStreams,
PackPos = (UInt64)(endOfPackedStreamsPosition - Marshal.SizeOf(typeof(SevenZipArchive.SignatureHeader))),
Sizes = cs.Sizes,
Digests = new SevenZipHeader.Digests(1)
{
CRCs = cs.CRCs
}
},
UnPackInfo = new SevenZipHeader.UnPackInfo()
{
Folders = new SevenZipHeader.Folder[1] {
cs.Folder
},
NumFolders = 1
}
};
// bait and switch
header.RawHeader = null;
header.EncodedHeader = headerStreamsInfo;
// write new header in headerStream
headerStream.Dispose();
headerStream = new MemoryStream();
header.Write(headerStream);
// update new end of packed position for encoded header
endOfPackedStreamsPosition = this.stream.Position;
}
// create start header and calculate header crc
headerStream.Position = 0;
var startHeader = new SevenZipArchive.StartHeader()
{
NextHeaderOffset = (UInt64)(endOfPackedStreamsPosition - Marshal.SizeOf(typeof(SevenZipArchive.SignatureHeader))),
NextHeaderSize = (UInt64)headerStream.Length,
NextHeaderCRC = new CRC().Calculate(headerStream).Result
};
// write headers at the end of output stream
headerStream.Position = 0;
headerStream.CopyTo(stream);
headerStream.Dispose();
// regenerate signature header with positions and crcs
var signatureHeader = new SevenZipArchive.SignatureHeader()
{
Signature = SevenZipArchive.kSignature.ToArray(),
ArchiveVersion = new SevenZipArchive.ArchiveVersion()
{
Major = 0,
Minor = 2,
},
StartHeaderCRC = new CRC().Calculate(startHeader.GetByteArray()).Result,
StartHeader = startHeader
};
// write start header and flush all pending writes
stream.Position = 0;
stream.Write(signatureHeader.GetByteArray(), 0, Marshal.SizeOf(signatureHeader));
stream.Flush();
}