int WriteCentralDirectoryHeader( BlubbZipEntry entry ) {
if( entry.CompressedSize < 0 ) {
throw new BlubbZipException( "Attempt to write central directory entry with unknown csize" );
}
if( entry.Size < 0 ) {
throw new BlubbZipException( "Attempt to write central directory entry with unknown size" );
}
if( entry.Crc < 0 ) {
throw new BlubbZipException( "Attempt to write central directory entry with unknown crc" );
}
// Write the central file header
WriteLEInt( BlubbZipConstants.CentralHeaderSignature );
// Version made by
WriteLEShort( BlubbZipConstants.VersionMadeBy );
// Version required to extract
WriteLEShort( entry.Version );
WriteLEShort( entry.Flags );
unchecked {
WriteLEShort( (byte)entry.CompressionMethod );
WriteLEInt( (int)entry.DosTime );
WriteLEInt( (int)entry.Crc );
}
if( ( entry.IsBlubb64Forced() ) || ( entry.CompressedSize >= 0xffffffff ) ) {
WriteLEInt( -1 );
} else {
WriteLEInt( (int)( entry.CompressedSize & 0xffffffff ) );
}
if( ( entry.IsBlubb64Forced() ) || ( entry.Size >= 0xffffffff ) ) {
WriteLEInt( -1 );
} else {
WriteLEInt( (int)entry.Size );
}
byte[] name = BlubbZipConstants.ConvertToArray( entry.Flags, entry.Name );
if( name.Length > 0xFFFF ) {
throw new BlubbZipException( "Entry name is too long." );
}
WriteLEShort( name.Length );
// Central header extra data is different to local header version so regenerate.
BlubbZipExtraData ed = new BlubbZipExtraData( entry.ExtraData );
if( entry.CentralHeaderRequiresBlubb64 ) {
ed.StartNewEntry();
if( ( entry.Size >= 0xffffffff ) || ( useBlubb64_ == UseBlubb64.On ) ) {
ed.AddLeLong( entry.Size );
}
if( ( entry.CompressedSize >= 0xffffffff ) || ( useBlubb64_ == UseBlubb64.On ) ) {
ed.AddLeLong( entry.CompressedSize );
}
if( entry.Offset >= 0xffffffff ) {
ed.AddLeLong( entry.Offset );
}
// Number of disk on which this file starts isnt supported and is never written here.
ed.AddNewEntry( 1 );
} else {
// Should have already be done when local header was added.
ed.Delete( 1 );
}
byte[] centralExtraData = ed.GetEntryData();
WriteLEShort( centralExtraData.Length );
WriteLEShort( entry.Comment != null ? entry.Comment.Length : 0 );
WriteLEShort( 0 ); // disk number
WriteLEShort( 0 ); // internal file attributes
// External file attributes...
if( entry.ExternalFileAttributes != -1 ) {
WriteLEInt( entry.ExternalFileAttributes );
} else {
if( entry.IsDirectory ) {
WriteLEUint( 16 );
} else {
WriteLEUint( 0 );
}
}
if( entry.Offset >= 0xffffffff ) {
WriteLEUint( 0xffffffff );
} else {
WriteLEUint( (uint)(int)entry.Offset );
}
if( name.Length > 0 ) {
baseStream_.Write( name, 0, name.Length );
}
if( centralExtraData.Length > 0 ) {
baseStream_.Write( centralExtraData, 0, centralExtraData.Length );
}
byte[] rawComment = ( entry.Comment != null ) ? Encoding.ASCII.GetBytes( entry.Comment ) : new byte[ 0 ];
if( rawComment.Length > 0 ) {
baseStream_.Write( rawComment, 0, rawComment.Length );
}
return BlubbZipConstants.CentralHeaderBaseSize + name.Length + centralExtraData.Length + rawComment.Length;
}
