public ZipReturn ZipFileCreate(string newFilename, bool 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)
{
LzmaEncoderProperties ep = new LzmaEncoderProperties(true, dictionarySize, numFastBytes);
LzmaStream lzs = new LzmaStream(ep, false, _zipFs);
_codeMSbytes = lzs.Properties;
_lzmaStream = lzs;
/*
* ZstandardStream zss = new ZstandardStream(_zipFs, 22, true);
* _codeMSbytes = new byte[] { 1, 4, 18, 0, 0 };
* _lzmaStream = zss;
*/
_packStreamStart = (ulong)_zipFs.Position;
}
return(ZipReturn.ZipGood);
}
public ZipReturn ZipFileCreate(string newFilename, bool compressOutput)
{
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();
BinaryWriter bw = new BinaryWriter(_zipFs);
_signatureHeader.Write(bw);
_compressed = compressOutput;
_unpackedStreamSize = 0;
if (_compressed)
{
LzmaEncoderProperties ep = new LzmaEncoderProperties(true, 1 << 24, 64);
_lzmaStream = new LzmaStream(ep, false, _zipFs);
_codeMSbytes = _lzmaStream.Properties;
_packStreamStart = (ulong)_zipFs.Position;
}
return(ZipReturn.ZipGood);
}
private void CloseWriting7Zip()
{
if (_compressed)
{
_lzmaStream.Close();
}
_packStreamSize = (ulong)_zipFs.Position - _packStreamStart;
Create7ZStructure();
byte[] newHeaderByte;
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter headerBw = new BinaryWriter(headerMem, Encoding.UTF8, true))
{
_header.WriteHeader(headerBw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
uint mainHeaderCRC = CRC.CalculateDigest(newHeaderByte, 0, (uint)newHeaderByte.Length);
#region Header Compression
long packedHeaderPos = _zipFs.Position;
LzmaEncoderProperties ep = new LzmaEncoderProperties(true, GetDictionarySizeFromUncompressedSize((ulong)newHeaderByte.Length), 64);
LzmaStream lzs = new LzmaStream(ep, false, _zipFs);
byte[] lzmaStreamProperties = lzs.Properties;
lzs.Write(newHeaderByte, 0, newHeaderByte.Length);
lzs.Close();
StreamsInfo streamsInfo = new StreamsInfo
{
PackPosition = (ulong)(packedHeaderPos - _baseOffset),
Folders = new[] {
new Folder {
BindPairs = new BindPair[0],
Coders = new [] {
new Coder {
Method = new byte[] { 3, 1, 1 },
NumInStreams = 1,
NumOutStreams = 1,
Properties = lzmaStreamProperties
}
},
UnpackedStreamSizes = new[] { (ulong)newHeaderByte.Length },
UnpackCRC = mainHeaderCRC
}
},
PackedStreams = new[] {
new PackedStreamInfo
{
PackedSize = (ulong)(_zipFs.Position - packedHeaderPos),
StreamPosition = 0
}
}
};
using (Stream headerMem = new MemoryStream())
{
using (BinaryWriter bw = new BinaryWriter(headerMem, Encoding.UTF8, true))
{
bw.Write((byte)HeaderProperty.kEncodedHeader);
streamsInfo.WriteHeader(bw);
newHeaderByte = new byte[headerMem.Length];
headerMem.Position = 0;
headerMem.Read(newHeaderByte, 0, newHeaderByte.Length);
}
}
mainHeaderCRC = CRC.CalculateDigest(newHeaderByte, 0, (uint)newHeaderByte.Length);
#endregion
using (BinaryWriter bw = new BinaryWriter(_zipFs, Encoding.UTF8, true))
{
ulong headerPosition = (ulong)_zipFs.Position + 32; //tzip header is 32 bytes
WriteRomVault7Zip(bw, headerPosition, (ulong)newHeaderByte.Length, mainHeaderCRC);
_zipFs.Write(newHeaderByte, 0, newHeaderByte.Length);
_signatureHeader.WriteFinal(bw, headerPosition, (ulong)newHeaderByte.Length, mainHeaderCRC);
}
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
}
