private void WriteCentralDirRecord(ZipStorer.ZipFileEntry _zfe)
{
Encoding encoding = _zfe.EncodeUTF8 ? Encoding.UTF8 : ZipStorer.DefaultEncoding;
byte[] bytes = encoding.GetBytes(_zfe.FilenameInZip);
byte[] bytes2 = encoding.GetBytes(_zfe.Comment);
this.ZipFileStream.Write(new byte[]
{
80,
75,
1,
2,
23,
11,
20,
0
}, 0, 8);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.EncodeUTF8 ? 2048 : 0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)_zfe.Method), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(this.DateTimeToDosTime(_zfe.ModifyTime)), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.Crc32), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.CompressedSize), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.FileSize), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)bytes.Length), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)bytes2.Length), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(33024), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.HeaderOffset), 0, 4);
this.ZipFileStream.Write(bytes, 0, bytes.Length);
this.ZipFileStream.Write(bytes2, 0, bytes2.Length);
}
private void WriteLocalHeader(ref ZipStorer.ZipFileEntry _zfe)
{
long position = this.ZipFileStream.Position;
Encoding encoding = _zfe.EncodeUTF8 ? Encoding.UTF8 : ZipStorer.DefaultEncoding;
byte[] bytes = encoding.GetBytes(_zfe.FilenameInZip);
this.ZipFileStream.Write(new byte[]
{
80,
75,
3,
4,
20,
0
}, 0, 6);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.EncodeUTF8 ? 2048 : 0), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)_zfe.Method), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(this.DateTimeToDosTime(_zfe.ModifyTime)), 0, 4);
Stream arg_B7_0 = this.ZipFileStream;
byte[] buffer = new byte[12];
arg_B7_0.Write(buffer, 0, 12);
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)bytes.Length), 0, 2);
this.ZipFileStream.Write(BitConverter.GetBytes(0), 0, 2);
this.ZipFileStream.Write(bytes, 0, bytes.Length);
_zfe.HeaderSize = (uint)(this.ZipFileStream.Position - position);
}
public void AddStream(ZipStorer.Compression _method, string _filenameInZip, Stream _source, DateTime _modTime, string _comment)
{
if (this.Access == FileAccess.Read)
{
throw new InvalidOperationException("Writing is not alowed");
}
if (this.Files.Count != 0)
{
ZipStorer.ZipFileEntry zipFileEntry = this.Files[this.Files.Count - 1];
}
ZipStorer.ZipFileEntry item = default(ZipStorer.ZipFileEntry);
item.Method = _method;
item.EncodeUTF8 = this.EncodeUTF8;
item.FilenameInZip = this.NormalizedFilename(_filenameInZip);
item.Comment = ((_comment == null) ? "" : _comment);
item.Crc32 = 0u;
item.HeaderOffset = (uint)this.ZipFileStream.Position;
item.ModifyTime = _modTime;
this.WriteLocalHeader(ref item);
item.FileOffset = (uint)this.ZipFileStream.Position;
this.Store(ref item, _source);
_source.Close();
this.UpdateCrcAndSizes(ref item);
this.Files.Add(item);
}
private void UpdateCrcAndSizes(ref ZipStorer.ZipFileEntry _zfe)
{
long position = this.ZipFileStream.Position;
this.ZipFileStream.Position = (long)((ulong)(_zfe.HeaderOffset + 8u));
this.ZipFileStream.Write(BitConverter.GetBytes((ushort)_zfe.Method), 0, 2);
this.ZipFileStream.Position = (long)((ulong)(_zfe.HeaderOffset + 14u));
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.Crc32), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.CompressedSize), 0, 4);
this.ZipFileStream.Write(BitConverter.GetBytes(_zfe.FileSize), 0, 4);
this.ZipFileStream.Position = position;
}
private void Store(ref ZipStorer.ZipFileEntry _zfe, Stream _source)
{
byte[] array = new byte[16384];
uint num = 0u;
long position = this.ZipFileStream.Position;
long position2 = _source.Position;
Stream stream;
if (_zfe.Method == ZipStorer.Compression.Store)
{
stream = this.ZipFileStream;
}
else
{
stream = new DeflateStream(this.ZipFileStream, CompressionMode.Compress, true);
}
_zfe.Crc32 = 4294967295u;
int num2;
do
{
num2 = _source.Read(array, 0, array.Length);
num += (uint)num2;
if (num2 > 0)
{
stream.Write(array, 0, num2);
uint num3 = 0u;
while ((ulong)num3 < (ulong)((long)num2))
{
_zfe.Crc32 = (ZipStorer.CrcTable[(int)((UIntPtr)((_zfe.Crc32 ^ (uint)array[(int)((UIntPtr)num3)]) & 255u))] ^ _zfe.Crc32 >> 8);
num3 += 1u;
}
}
}while (num2 == array.Length);
stream.Flush();
if (_zfe.Method == ZipStorer.Compression.Deflate)
{
stream.Dispose();
}
_zfe.Crc32 ^= 4294967295u;
_zfe.FileSize = num;
_zfe.CompressedSize = (uint)(this.ZipFileStream.Position - position);
if (_zfe.Method == ZipStorer.Compression.Deflate && !this.ForceDeflating && _source.CanSeek && _zfe.CompressedSize > _zfe.FileSize)
{
_zfe.Method = ZipStorer.Compression.Store;
this.ZipFileStream.Position = position;
this.ZipFileStream.SetLength(position);
_source.Position = position2;
this.Store(ref _zfe, _source);
}
}
public List <ZipStorer.ZipFileEntry> ReadCentralDir()
{
if (this.CentralDirImage == null)
{
throw new InvalidOperationException("Central directory currently does not exist");
}
List <ZipStorer.ZipFileEntry> list = new List <ZipStorer.ZipFileEntry>();
ushort num2;
ushort num3;
ushort num4;
for (int i = 0; i < this.CentralDirImage.Length; i += (int)(46 + num2 + num3 + num4))
{
uint num = BitConverter.ToUInt32(this.CentralDirImage, i);
if (num != 33639248u)
{
break;
}
bool flag = (BitConverter.ToUInt16(this.CentralDirImage, i + 8) & 2048) != 0;
ushort method = BitConverter.ToUInt16(this.CentralDirImage, i + 10);
uint dt = BitConverter.ToUInt32(this.CentralDirImage, i + 12);
uint crc = BitConverter.ToUInt32(this.CentralDirImage, i + 16);
uint compressedSize = BitConverter.ToUInt32(this.CentralDirImage, i + 20);
uint fileSize = BitConverter.ToUInt32(this.CentralDirImage, i + 24);
num2 = BitConverter.ToUInt16(this.CentralDirImage, i + 28);
num3 = BitConverter.ToUInt16(this.CentralDirImage, i + 30);
num4 = BitConverter.ToUInt16(this.CentralDirImage, i + 32);
uint headerOffset = BitConverter.ToUInt32(this.CentralDirImage, i + 42);
uint headerSize = (uint)(46 + num2 + num3 + num4);
Encoding encoding = flag ? Encoding.UTF8 : ZipStorer.DefaultEncoding;
ZipStorer.ZipFileEntry item = default(ZipStorer.ZipFileEntry);
item.Method = (ZipStorer.Compression)method;
item.FilenameInZip = encoding.GetString(this.CentralDirImage, i + 46, (int)num2);
item.FileOffset = this.GetFileOffset(headerOffset);
item.FileSize = fileSize;
item.CompressedSize = compressedSize;
item.HeaderOffset = headerOffset;
item.HeaderSize = headerSize;
item.Crc32 = crc;
item.ModifyTime = this.DosTimeToDateTime(dt);
if (num4 > 0)
{
item.Comment = encoding.GetString(this.CentralDirImage, i + 46 + (int)num2 + (int)num3, (int)num4);
}
list.Add(item);
}
return(list);
}
public bool ExtractFile(ZipStorer.ZipFileEntry _zfe, Stream _stream)
{
if (!_stream.CanWrite)
{
throw new InvalidOperationException("Stream cannot be written");
}
byte[] array = new byte[4];
this.ZipFileStream.Seek((long)((ulong)_zfe.HeaderOffset), SeekOrigin.Begin);
this.ZipFileStream.Read(array, 0, 4);
if (BitConverter.ToUInt32(array, 0) != 67324752u)
{
return(false);
}
Stream stream;
if (_zfe.Method == ZipStorer.Compression.Store)
{
stream = this.ZipFileStream;
}
else
{
if (_zfe.Method != ZipStorer.Compression.Deflate)
{
return(false);
}
stream = new DeflateStream(this.ZipFileStream, CompressionMode.Decompress, true);
}
byte[] array2 = new byte[16384];
this.ZipFileStream.Seek((long)((ulong)_zfe.FileOffset), SeekOrigin.Begin);
int num2;
for (uint num = _zfe.FileSize; num > 0u; num -= (uint)num2)
{
num2 = stream.Read(array2, 0, (int)Math.Min((long)((ulong)num), (long)array2.Length));
_stream.Write(array2, 0, num2);
}
_stream.Flush();
if (_zfe.Method == ZipStorer.Compression.Deflate)
{
stream.Dispose();
}
return(true);
}
public bool ExtractFile(ZipStorer.ZipFileEntry _zfe, string _filename)
{
string directoryName = Path.GetDirectoryName(_filename);
if (!Directory.Exists(directoryName))
{
Directory.CreateDirectory(directoryName);
}
if (Directory.Exists(_filename))
{
return(true);
}
Stream stream = new FileStream(_filename, FileMode.Create, FileAccess.Write);
bool flag = this.ExtractFile(_zfe, stream);
if (flag)
{
stream.Close();
}
File.SetCreationTime(_filename, _zfe.ModifyTime);
File.SetLastWriteTime(_filename, _zfe.ModifyTime);
return(flag);
}
