public ZipReturn ZipFileCreateFromUncompressedSize(string newFilename, sevenZipCompressType ctype, ulong unCompressedSize)
{
if (ctype == sevenZipCompressType.zstd)
{
if (!supportZstd)
{
ctype = sevenZipCompressType.lzma;
}
}
return(ZipFileCreate(newFilename, ctype, GetDictionarySizeFromUncompressedSize(unCompressedSize)));
}
public ZipReturn ZipFileCreate(string newFilename, sevenZipCompressType compressOutput, int dictionarySize = 1 << 24, int numFastBytes = 64)
{
if (ZipOpen != ZipOpenType.Closed)
{
return(ZipReturn.ZipFileAlreadyOpen);
}
DirUtil.CreateDirForFile(newFilename);
_zipFileInfo = new FileInfo(newFilename);
int errorCode = FileStream.OpenFileWrite(newFilename, out _zipFs);
if (errorCode != 0)
{
ZipFileClose();
return(ZipReturn.ZipErrorOpeningFile);
}
ZipOpen = ZipOpenType.OpenWrite;
_signatureHeader = new SignatureHeader();
_header = new Header();
using (BinaryWriter bw = new BinaryWriter(_zipFs, Encoding.UTF8, true))
{
_signatureHeader.Write(bw);
}
_baseOffset = _zipFs.Position;
_compressed = compressOutput;
_unpackedStreamSize = 0;
if (_compressed == sevenZipCompressType.lzma)
{
LzmaEncoderProperties ep = new LzmaEncoderProperties(true, dictionarySize, numFastBytes);
LzmaStream lzs = new LzmaStream(ep, false, _zipFs);
_codeMSbytes = lzs.Properties;
_lzmaStream = lzs;
_packStreamStart = (ulong)_zipFs.Position;
}
else if (_compressed == sevenZipCompressType.zstd)
{
ZstandardStream zss = new ZstandardStream(_zipFs, 18, true);
_codeMSbytes = new byte[] { 1, 4, 18, 0, 0 };
_lzmaStream = zss;
_packStreamStart = (ulong)_zipFs.Position;
}
return(ZipReturn.ZipGood);
}
