===c int '''Tcl_ZlibStreamInit'''(Tcl_Interp *''interp'', int ''mode'', int ''format'', int ''level'', Tcl_Obj *''dictObj'', Tcl_ZlibStream *''zshandlePtr'') === Create a compressing or decompressing [zlib] stream (returned in the variable pointed to by the ''zshandlePtr'' argument). If an ''interp'' is given, bind the stream to a command in that [interpreter]. (If ''interp'' is NULL, leave it unbound.) This is the interface behind the '''[zlib stream]''' command. It is also used by [Tk]'s [png] format handler. Once you have a `Tcl_ZlibStream` handle, you can use it with these other functions: * '''Tcl_ZlibStreamChecksum''' — returns the checksum (according to the stream format) of the ''uncompressed'' data that has gone through the stream engine. * '''Tcl_ZlibStreamClose''' — deletes the stream. * '''Tcl_ZlibStreamEof''' — tests whether the stream has reached the end of the data (depends on there being a marker in the stream to indicate this). * '''Tcl_ZlibStreamGet''' — appends processed (i.e. compressed or decompressed) data to a [Tcl_Obj]. * '''Tcl_ZlibStreamGetCommandName''' — gets the name of the stream command, or NULL if there isn't one. * '''Tcl_ZlibStreamPut''' — adds a byte-array [Tcl_Obj] to the stream, ready to be compressed or decompressed. <> Tcl Library | Compression