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
}
