internal void LocalFileHeaderFake(ulong filePosition, ulong uncompressedSize, ulong compressedSize, byte[] crc32, MemoryStream ms)
{
using BinaryWriter bw = new(ms, Encoding.UTF8, true);
RelativeOffsetOfLocalHeader = filePosition;
SetStatus(LocalFileStatus.TrrntZip);
UncompressedSize = uncompressedSize;
_compressedSize = compressedSize;
CRC = crc32;
ZipExtraFieldWrite zefw = new();
SetStatus(LocalFileStatus.Zip64,
zefw.Zip64(UncompressedSize, _compressedSize, RelativeOffsetOfLocalHeader, false,
out uint headerUnCompressedSize, out uint headerCompressedSize, out uint headerRelativeOffsetOfLocalHeader)
);
_extraField = zefw.ExtraField;
byte[] bFileName;
if (CompressUtils.IsCodePage437(Filename))
{
bFileName = CompressUtils.GetBytes(Filename);
}
else
{
GeneralPurposeBitFlag |= 1 << 11;
bFileName = Encoding.UTF8.GetBytes(Filename);
}
ushort versionNeededToExtract = (ushort)(GetStatus(LocalFileStatus.Zip64) ? 45 : 20);
bw.Write(LocalFileHeaderSignature);
bw.Write(versionNeededToExtract);
bw.Write(GeneralPurposeBitFlag);
bw.Write(_compressionMethod);
CompressUtils.UtcTicksToDosDateTime(HeaderLastModified, out ushort lastModFileDate, out ushort lastModFileTime);
bw.Write(lastModFileTime);
bw.Write(lastModFileDate);
WriteCRC(bw, CRC);
bw.Write(headerCompressedSize);
bw.Write(headerUnCompressedSize);
ushort fileNameLength = (ushort)bFileName.Length;
bw.Write(fileNameLength);
ushort extraFieldLength = (ushort)_extraField.Length;
bw.Write(extraFieldLength);
bw.Write(bFileName, 0, fileNameLength);
bw.Write(_extraField);
}
private void LocalFileHeaderWrite(Stream zipFs)
{
using BinaryWriter bw = new(zipFs, Encoding.UTF8, true);
ZipExtraFieldWrite zefw = new();
bool zip64 = zefw.Zip64(UncompressedSize, _compressedSize, RelativeOffsetOfLocalHeader, false,
out uint headerUnCompressedSize, out uint headerCompressedSize,
out uint headerRelativeOffsetOfLocalHeader);
_extraField = zefw.ExtraField;
SetStatus(LocalFileStatus.Zip64, zip64);
byte[] bFileName;
if (CompressUtils.IsCodePage437(Filename))
{
bFileName = CompressUtils.GetBytes(Filename);
}
else
{
GeneralPurposeBitFlag |= 1 << 11;
bFileName = Encoding.UTF8.GetBytes(Filename);
}
ushort versionNeededToExtract = (ushort)(GetStatus(LocalFileStatus.Zip64) ? 45 : 20);
RelativeOffsetOfLocalHeader = (ulong)zipFs.Position;
bw.Write(LocalFileHeaderSignature);
bw.Write(versionNeededToExtract);
bw.Write(GeneralPurposeBitFlag);
bw.Write(_compressionMethod);
CompressUtils.UtcTicksToDosDateTime(HeaderLastModified, out ushort lastModFileDate, out ushort lastModFileTime);
bw.Write(lastModFileTime);
bw.Write(lastModFileDate);
// these 3 values will be set correctly after the file data has been written
bw.Write(0xffffffff); // crc
bw.Write(0xffffffff); // CompressedSize 32bit
bw.Write(0xffffffff); // UncompressedSie 32bit
ushort fileNameLength = (ushort)bFileName.Length;
bw.Write(fileNameLength);
ushort extraFieldLength = (ushort)_extraField.Length;
bw.Write(extraFieldLength);
bw.Write(bFileName, 0, fileNameLength);
_extraLocation = (ulong)zipFs.Position;
bw.Write(_extraField);
}
internal void CentralDirectoryWrite(Stream crcStream)
{
using BinaryWriter bw = new(crcStream, Encoding.UTF8, true);
ZipExtraFieldWrite zefw = new();
SetStatus(LocalFileStatus.Zip64,
zefw.Zip64(UncompressedSize, _compressedSize, RelativeOffsetOfLocalHeader, true,
out uint headerUnCompressedSize, out uint headerCompressedSize, out uint headerRelativeOffsetOfLocalHeader)
);
_extraField = zefw.ExtraField;
ushort extraFieldLength = (ushort)_extraField.Length;
byte[] bFileName;
if (CompressUtils.IsCodePage437(Filename))
{
bFileName = CompressUtils.GetBytes(Filename);
}
else
{
GeneralPurposeBitFlag |= 1 << 11;
bFileName = Encoding.UTF8.GetBytes(Filename);
}
ushort fileNameLength = (ushort)bFileName.Length;
ushort versionNeededToExtract = (ushort)(GetStatus(LocalFileStatus.Zip64) ? 45 : 20);
CompressUtils.UtcTicksToDosDateTime(HeaderLastModified, out ushort lastModFileDate, out ushort lastModFileTime);
bw.Write(CentralDirectoryHeaderSignature);
bw.Write((ushort)0);
bw.Write(versionNeededToExtract);
bw.Write(GeneralPurposeBitFlag);
bw.Write(_compressionMethod);
bw.Write(lastModFileTime);
bw.Write(lastModFileDate);
WriteCRC(bw, CRC);
bw.Write(headerCompressedSize);
bw.Write(headerUnCompressedSize);
bw.Write(fileNameLength);
bw.Write(extraFieldLength);
bw.Write((ushort)0); // file comment length
bw.Write((ushort)0); // disk number start
bw.Write((ushort)0); // internal file attributes
bw.Write((uint)0); // external file attributes
bw.Write(headerRelativeOffsetOfLocalHeader);
bw.Write(bFileName, 0, fileNameLength);
bw.Write(_extraField, 0, extraFieldLength);
// No File Comment
}
public void ZipFileCloseFake(ulong fileOffset, out byte[] centralDir)
{
centralDir = null;
if (ZipOpen != ZipOpenType.OpenFakeWrite)
{
return;
}
bool lTrrntzip = true;
_zipFs = new MemoryStream();
_centralDirStart = fileOffset;
CrcCalculatorStream crcCs = new(_zipFs, true);
foreach (ZipLocalFile t in _localFiles)
{
t.CentralDirectoryWrite(crcCs);
lTrrntzip &= t.GetStatus(LocalFileStatus.TrrntZip);
}
crcCs.Flush();
crcCs.Close();
_centralDirSize = (ulong)_zipFs.Position;
FileComment = lTrrntzip ? CompressUtils.GetBytes("TORRENTZIPPED-" + crcCs.Crc.ToString("X8")) : new byte[0];
ZipStatus = lTrrntzip ? ZipStatus.TrrntZip : ZipStatus.None;
crcCs.Dispose();
_zip64 = (_centralDirStart >= 0xffffffff) || (_centralDirSize >= 0xffffffff) || (_localFiles.Count >= 0xffff);
if (_zip64)
{
_endOfCentralDir64 = fileOffset + (ulong)_zipFs.Position;
Zip64EndOfCentralDirWrite();
Zip64EndOfCentralDirectoryLocatorWrite();
}
EndOfCentralDirWrite();
centralDir = ((MemoryStream)_zipFs).ToArray();
_zipFs.Close();
_zipFs.Dispose();
ZipOpen = ZipOpenType.Closed;
}
private void zipFileCloseWrite()
{
bool lTrrntzip = true;
_centralDirStart = (ulong)_zipFs.Position;
using (CrcCalculatorStream crcCs = new CrcCalculatorStream(_zipFs, true))
{
foreach (ZipLocalFile t in _localFiles)
{
t.CentralDirectoryWrite(crcCs);
lTrrntzip &= t.GetStatus(LocalFileStatus.TrrntZip);
}
crcCs.Flush();
crcCs.Close();
_centralDirSize = (ulong)_zipFs.Position - _centralDirStart;
FileComment = lTrrntzip ? CompressUtils.GetBytes("TORRENTZIPPED-" + crcCs.Crc.ToString("X8")) : new byte[0];
ZipStatus = lTrrntzip ? ZipStatus.TrrntZip : ZipStatus.None;
}
_zip64 = false;
_zip64 |= _centralDirStart >= 0xffffffff;
_zip64 |= _centralDirSize >= 0xffffffff;
_zip64 |= _localFiles.Count >= 0xffff;
if (_zip64)
{
_endOfCentralDir64 = (ulong)_zipFs.Position;
Zip64EndOfCentralDirWrite();
Zip64EndOfCentralDirectoryLocatorWrite();
}
EndOfCentralDirWrite();
_zipFs.SetLength(_zipFs.Position);
_zipFs.Flush();
_zipFs.Close();
_zipFs.Dispose();
_zipFileInfo = new FileInfo(_zipFileInfo.FullName);
ZipOpen = ZipOpenType.Closed;
}
