Scz_WriteString( sczfile, string, N ) - Incrementally buffers data and compresses it to
an output file when appropriate. This routine is handy for
applications wishing to compress output while writing to disk.
Especially those creating only small amounts of data at a time.
First argument is SCZ_File pointer, as returned by Scz_File_Open().
Second argument is input array, third is the array's length.
This routine just adds to an scz buffer, until enough has accumulated
to compress a block's worth. After all writing is done, file must
be closed with Scz_File_Close().
int Scz_WriteString( struct SCZ_File *sczfile, unsigned char *buffer, int N );