private bool WriteLocalFileHeader(bool isEmptyFile)
{
BinaryWriter binaryWriter = new BinaryWriter(this._archive.ArchiveStream);
Zip64ExtraField zip64ExtraField = new Zip64ExtraField();
bool flag = false;
uint num1;
uint num2;
if (isEmptyFile)
{
this.CompressionMethod = ZipArchiveEntry.CompressionMethodValues.Stored;
num1 = 0U;
num2 = 0U;
}
else if (this._archive.Mode == ZipArchiveMode.Create && !this._archive.ArchiveStream.CanSeek && !isEmptyFile)
{
this._generalPurposeBitFlag = this._generalPurposeBitFlag | ZipArchiveEntry.BitFlagValues.DataDescriptor;
flag = false;
num1 = 0U;
num2 = 0U;
}
else if (this.SizesTooLarge())
{
flag = true;
num1 = uint.MaxValue;
num2 = uint.MaxValue;
zip64ExtraField.CompressedSize = new long?(this._compressedSize);
zip64ExtraField.UncompressedSize = new long?(this._uncompressedSize);
this.VersionToExtractAtLeast(ZipVersionNeededValues.Zip64);
}
else
{
flag = false;
num1 = (uint)this._compressedSize;
num2 = (uint)this._uncompressedSize;
}
this._offsetOfLocalHeader = binaryWriter.BaseStream.Position;
int num3 = (flag ? (int)zip64ExtraField.TotalSize : 0) + (this._lhUnknownExtraFields != null ? ZipGenericExtraField.TotalSize(this._lhUnknownExtraFields) : 0);
ushort num4;
if (num3 > (int)ushort.MaxValue)
{
num4 = flag ? zip64ExtraField.TotalSize : (ushort)0;
this._lhUnknownExtraFields = null;
}
else
{
num4 = (ushort)num3;
}
binaryWriter.Write(67324752U);
binaryWriter.Write((ushort)this._versionToExtract);
binaryWriter.Write((ushort)this._generalPurposeBitFlag);
binaryWriter.Write((ushort)this.CompressionMethod);
binaryWriter.Write(ZipHelper.DateTimeToDosTime(this._lastModified.DateTime));
binaryWriter.Write(this._crc32);
binaryWriter.Write(num1);
binaryWriter.Write(num2);
binaryWriter.Write((ushort)this._storedEntryNameBytes.Length);
binaryWriter.Write(num4);
binaryWriter.Write(this._storedEntryNameBytes);
if (flag)
{
zip64ExtraField.WriteBlock(this._archive.ArchiveStream);
}
if (this._lhUnknownExtraFields != null)
{
ZipGenericExtraField.WriteAllBlocks(this._lhUnknownExtraFields, this._archive.ArchiveStream);
}
return(flag);
}
internal void WriteCentralDirectoryFileHeader()
{
BinaryWriter binaryWriter = new BinaryWriter(this._archive.ArchiveStream);
Zip64ExtraField zip64ExtraField = new Zip64ExtraField();
bool flag = false;
uint num1;
uint num2;
if (this.SizesTooLarge())
{
flag = true;
num1 = uint.MaxValue;
num2 = uint.MaxValue;
zip64ExtraField.CompressedSize = new long?(this._compressedSize);
zip64ExtraField.UncompressedSize = new long?(this._uncompressedSize);
}
else
{
num1 = (uint)this._compressedSize;
num2 = (uint)this._uncompressedSize;
}
uint num3;
if (this._offsetOfLocalHeader > (long)uint.MaxValue)
{
flag = true;
num3 = uint.MaxValue;
zip64ExtraField.LocalHeaderOffset = new long?(this._offsetOfLocalHeader);
}
else
{
num3 = (uint)this._offsetOfLocalHeader;
}
if (flag)
{
this.VersionToExtractAtLeast(ZipVersionNeededValues.Zip64);
}
int num4 = (flag ? (int)zip64ExtraField.TotalSize : 0) + (this._cdUnknownExtraFields != null ? ZipGenericExtraField.TotalSize(this._cdUnknownExtraFields) : 0);
ushort num5;
if (num4 > (int)ushort.MaxValue)
{
num5 = flag ? zip64ExtraField.TotalSize : (ushort)0;
this._cdUnknownExtraFields = null;
}
else
{
num5 = (ushort)num4;
}
binaryWriter.Write(33639248U);
binaryWriter.Write((ushort)this._versionToExtract);
binaryWriter.Write((ushort)this._versionToExtract);
binaryWriter.Write((ushort)this._generalPurposeBitFlag);
binaryWriter.Write((ushort)this.CompressionMethod);
binaryWriter.Write(ZipHelper.DateTimeToDosTime(this._lastModified.DateTime));
binaryWriter.Write(this._crc32);
binaryWriter.Write(num1);
binaryWriter.Write(num2);
binaryWriter.Write((ushort)this._storedEntryNameBytes.Length);
binaryWriter.Write(num5);
binaryWriter.Write(this._fileComment != null ? (ushort)this._fileComment.Length : (ushort)0);
binaryWriter.Write((ushort)0);
binaryWriter.Write((ushort)0);
binaryWriter.Write((uint)this._externalFileAttributes);
binaryWriter.Write(num3);
binaryWriter.Write(this._storedEntryNameBytes);
if (flag)
{
zip64ExtraField.WriteBlock(this._archive.ArchiveStream);
}
if (this._cdUnknownExtraFields != null)
{
ZipGenericExtraField.WriteAllBlocks(this._cdUnknownExtraFields, this._archive.ArchiveStream);
}
if (this._fileComment != null)
{
binaryWriter.Write(this._fileComment);
}
}