public static bool TryReadBlock(BinaryReader reader, long endExtraField, out ZipGenericExtraField field)
{
field = new ZipGenericExtraField();
if ((endExtraField - reader.BaseStream.Position) < 4L)
{
return(false);
}
field._tag = reader.ReadUInt16();
field._size = reader.ReadUInt16();
if ((endExtraField - reader.BaseStream.Position) < field._size)
{
return(false);
}
field._data = reader.ReadBytes(field._size);
return(true);
}
public static List <ZipGenericExtraField> GetExtraFields(BinaryReader reader)
{
List <ZipGenericExtraField> list;
reader.BaseStream.Seek(0x1aL, SeekOrigin.Current);
ushort num = reader.ReadUInt16();
ushort num2 = reader.ReadUInt16();
reader.BaseStream.Seek((long)num, SeekOrigin.Current);
using (Stream stream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)num2))
{
list = ZipGenericExtraField.ParseExtraField(stream);
}
Zip64ExtraField.RemoveZip64Blocks(list);
return(list);
}
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
Zip64ExtraField field;
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != 0x2014b50)
{
return(false);
}
header.VersionMadeBy = reader.ReadUInt16();
header.VersionNeededToExtract = reader.ReadUInt16();
header.GeneralPurposeBitFlag = reader.ReadUInt16();
header.CompressionMethod = reader.ReadUInt16();
header.LastModified = reader.ReadUInt32();
header.Crc32 = reader.ReadUInt32();
uint num = reader.ReadUInt32();
uint num2 = reader.ReadUInt32();
header.FilenameLength = reader.ReadUInt16();
header.ExtraFieldLength = reader.ReadUInt16();
header.FileCommentLength = reader.ReadUInt16();
ushort num3 = reader.ReadUInt16();
header.InternalFileAttributes = reader.ReadUInt16();
header.ExternalFileAttributes = reader.ReadUInt32();
uint num4 = reader.ReadUInt32();
header.Filename = reader.ReadBytes(header.FilenameLength);
bool readUncompressedSize = num2 == uint.MaxValue;
bool readCompressedSize = num == uint.MaxValue;
bool readLocalHeaderOffset = num4 == uint.MaxValue;
bool readStartDiskNumber = num3 == 0xffff;
long position = reader.BaseStream.Position + header.ExtraFieldLength;
using (Stream stream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)header.ExtraFieldLength))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(stream);
field = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
else
{
header.ExtraFields = null;
field = Zip64ExtraField.GetJustZip64Block(stream, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
}
reader.BaseStream.AdvanceToPosition(position);
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes(header.FileCommentLength);
}
else
{
Stream baseStream = reader.BaseStream;
baseStream.Position += header.FileCommentLength;
header.FileComment = null;
}
header.UncompressedSize = !field.UncompressedSize.HasValue ? ((long)num2) : field.UncompressedSize.Value;
header.CompressedSize = !field.CompressedSize.HasValue ? ((long)num) : field.CompressedSize.Value;
header.RelativeOffsetOfLocalHeader = !field.LocalHeaderOffset.HasValue ? ((long)num4) : field.LocalHeaderOffset.Value;
header.DiskNumberStart = !field.StartDiskNumber.HasValue ? num3 : field.StartDiskNumber.Value;
return(true);
}
private bool WriteLocalFileHeader(bool isEmptyFile)
{
uint maxValue;
uint num2;
ushort num4;
BinaryWriter writer = new BinaryWriter(_archive.ArchiveStream);
Zip64ExtraField field = new Zip64ExtraField();
bool flag = false;
if (isEmptyFile)
{
CompressionMethod = CompressionMethodValues.Stored;
maxValue = 0;
num2 = 0;
}
else if (((_archive.Mode == ZipArchiveMode.Create) && !_archive.ArchiveStream.CanSeek) && !isEmptyFile)
{
_generalPurposeBitFlag |= BitFlagValues.DataDescriptor;
flag = false;
maxValue = 0;
num2 = 0;
}
else if (SizesTooLarge())
{
flag = true;
maxValue = uint.MaxValue;
num2 = uint.MaxValue;
field.CompressedSize = new long?(_compressedSize);
field.UncompressedSize = new long?(_uncompressedSize);
VersionToExtractAtLeast(ZipVersionNeededValues.Zip64);
}
else
{
flag = false;
maxValue = (uint)_compressedSize;
num2 = (uint)_uncompressedSize;
}
_offsetOfLocalHeader = writer.BaseStream.Position;
int num3 = (flag ? field.TotalSize : 0) + ((_lhUnknownExtraFields != null) ? ZipGenericExtraField.TotalSize(_lhUnknownExtraFields) : 0);
if (num3 > 0xffff)
{
num4 = flag ? field.TotalSize : ((ushort)0);
_lhUnknownExtraFields = null;
}
else
{
num4 = (ushort)num3;
}
writer.Write((uint)0x4034b50);
writer.Write((ushort)_versionToExtract);
writer.Write((ushort)_generalPurposeBitFlag);
writer.Write((ushort)CompressionMethod);
writer.Write(ZipHelper.DateTimeToDosTime(_lastModified.DateTime));
writer.Write(_crc32);
writer.Write(maxValue);
writer.Write(num2);
writer.Write((ushort)_storedEntryNameBytes.Length);
writer.Write(num4);
writer.Write(_storedEntryNameBytes);
if (flag)
{
field.WriteBlock(_archive.ArchiveStream);
}
if (_lhUnknownExtraFields != null)
{
ZipGenericExtraField.WriteAllBlocks(_lhUnknownExtraFields, _archive.ArchiveStream);
}
return(flag);
}
internal void WriteCentralDirectoryFileHeader()
{
uint maxValue;
uint num2;
uint num3;
ushort num5;
BinaryWriter writer = new BinaryWriter(_archive.ArchiveStream);
Zip64ExtraField field = new Zip64ExtraField();
bool flag = false;
if (SizesTooLarge())
{
flag = true;
maxValue = uint.MaxValue;
num2 = uint.MaxValue;
field.CompressedSize = new long?(_compressedSize);
field.UncompressedSize = new long?(_uncompressedSize);
}
else
{
maxValue = (uint)_compressedSize;
num2 = (uint)_uncompressedSize;
}
if (_offsetOfLocalHeader > 0xffffffffL)
{
flag = true;
num3 = uint.MaxValue;
field.LocalHeaderOffset = new long?(_offsetOfLocalHeader);
}
else
{
num3 = (uint)_offsetOfLocalHeader;
}
if (flag)
{
VersionToExtractAtLeast(ZipVersionNeededValues.Zip64);
}
int num4 = (flag ? field.TotalSize : 0) + ((_cdUnknownExtraFields != null) ? ZipGenericExtraField.TotalSize(_cdUnknownExtraFields) : 0);
if (num4 > 0xffff)
{
num5 = flag ? field.TotalSize : ((ushort)0);
_cdUnknownExtraFields = null;
}
else
{
num5 = (ushort)num4;
}
writer.Write((uint)0x2014b50);
writer.Write((ushort)_versionToExtract);
writer.Write((ushort)_versionToExtract);
writer.Write((ushort)_generalPurposeBitFlag);
writer.Write((ushort)CompressionMethod);
writer.Write(ZipHelper.DateTimeToDosTime(_lastModified.DateTime));
writer.Write(_crc32);
writer.Write(maxValue);
writer.Write(num2);
writer.Write((ushort)_storedEntryNameBytes.Length);
writer.Write(num5);
writer.Write((_fileComment != null) ? ((ushort)_fileComment.Length) : ((ushort)0));
writer.Write((ushort)0);
writer.Write((ushort)0);
writer.Write((uint)0);
writer.Write(num3);
writer.Write(_storedEntryNameBytes);
if (flag)
{
field.WriteBlock(_archive.ArchiveStream);
}
if (_cdUnknownExtraFields != null)
{
ZipGenericExtraField.WriteAllBlocks(_cdUnknownExtraFields, _archive.ArchiveStream);
}
if (_fileComment != null)
{
writer.Write(_fileComment);
}
}
