private static void ReadZipFileComment(ZipFile zf)
{
// no seek - stream integrity should be protected by the caller
byte[] block = new byte[2];
zf.ReadStream.Read(block, 0, block.Length);
short commentLength = (short)(block[0] + (block[1] * 0x100));
if (commentLength > 0)
{
block = new byte[commentLength];
zf.ReadStream.Read(block, 0, block.Length);
if (ZipSharedUtilities.HighBytes(block) && (zf._encoding == Encoding.GetEncoding("ibm437")))
{
zf._encoding = Encoding.UTF8;
}
zf.Comment = ZipSharedUtilities.StringFromBuffer(block, block.Length, zf._encoding);
}
}
private void WriteHeader(Stream s, int cycle)
{
byte[] bytes = new byte[0x2200];
int i = 0;
bytes[i++] = 80;
bytes[i++] = 0x4b;
bytes[i++] = 3;
bytes[i++] = 4;
short VersionNeededToExctract = 20;
bytes[i++] = (byte)(VersionNeededToExctract & 0xff);
bytes[i++] = (byte)((VersionNeededToExctract & 0xff00) >> 8);
byte[] FileNameBytes = this.GetFileNameBytes();
short filenameLength = (short)FileNameBytes.Length;
this._CommentBytes = null;
if (!String.IsNullOrEmpty(this._Comment))
{
this._CommentBytes = this._Comment.ToByteArray(this._encoding);
}
bool setUtf8Bit = this.UseUtf8Encoding && (ZipSharedUtilities.HighBytes(this._CommentBytes) || ZipSharedUtilities.HighBytes(FileNameBytes));
this._BitField = ((short)0);
if (setUtf8Bit)
{
this._BitField = (short)(this._BitField | 0x800);
}
if (!s.CanSeek)
{
this._BitField = (short)(this._BitField | 8);
}
bytes[i++] = (byte)(this._BitField & 0xff);
bytes[i++] = (byte)((this._BitField & 0xff00) >> 8);
if (this.__FileDataPosition == 0L)
{
this._UncompressedSize = 0;
this._CompressedSize = 0;
this._Crc32 = 0;
}
this.FigureCompressionMethodForWriting(cycle);
bytes[i++] = (byte)(this.CompressionMethod & 0xff);
bytes[i++] = (byte)((this.CompressionMethod & 0xff00) >> 8);
this._TimeBlob = ZipSharedUtilities.DateTimeToPacked(this.LastModified);
bytes[i++] = (byte)(this._TimeBlob & 0xff);
bytes[i++] = (byte)((this._TimeBlob & 0xff00) >> 8);
bytes[i++] = (byte)((this._TimeBlob & 0xff0000) >> 0x10);
bytes[i++] = (byte)((this._TimeBlob & 0xff000000L) >> 0x18);
bytes[i++] = (byte)(this._Crc32 & 0xff);
bytes[i++] = (byte)((this._Crc32 & 0xff00) >> 8);
bytes[i++] = (byte)((this._Crc32 & 0xff0000) >> 0x10);
bytes[i++] = (byte)((this._Crc32 & 0xff000000L) >> 0x18);
bytes[i++] = (byte)(this._CompressedSize & 0xff);
bytes[i++] = (byte)((this._CompressedSize & 0xff00) >> 8);
bytes[i++] = (byte)((this._CompressedSize & 0xff0000) >> 0x10);
bytes[i++] = (byte)((this._CompressedSize & 0xff000000L) >> 0x18);
bytes[i++] = (byte)(this._UncompressedSize & 0xff);
bytes[i++] = (byte)((this._UncompressedSize & 0xff00) >> 8);
bytes[i++] = (byte)((this._UncompressedSize & 0xff0000) >> 0x10);
bytes[i++] = (byte)((this._UncompressedSize & 0xff000000L) >> 0x18);
bytes[i++] = (byte)(filenameLength & 0xff);
bytes[i++] = (byte)((filenameLength & 0xff00) >> 8);
byte[] extra = null;
short ExtraFieldLength = (extra == null) ? ((short)0) : ((short)extra.Length);
bytes[i++] = (byte)(ExtraFieldLength & 0xff);
bytes[i++] = (byte)((ExtraFieldLength & 0xff00) >> 8);
int j = 0;
j = 0;
while ((j < FileNameBytes.Length) && ((i + j) < bytes.Length))
{
bytes[i + j] = FileNameBytes[j];
j++;
}
i += j;
if (extra != null)
{
j = 0;
while (j < extra.Length)
{
bytes[i + j] = extra[j];
j++;
}
i += j;
}
CountingStream counter = s as CountingStream;
this._RelativeOffsetOfHeader = (counter != null) ? counter.BytesWritten : ((int)s.Position);
this._LengthOfHeader = i;
s.Write(bytes, 0, i);
this._EntryHeader = new byte[i];
for (j = 0; j < i; j++)
{
this._EntryHeader[j] = bytes[j];
}
}