step

Incrementally encodes or decodes (depending on this) an input stream by 'stepping' through a block of input at a time.

You should make sure outbuf is large enough by calling outlen to find out how large outbuf might need to be.

Parameters:

this	a Encoding
inbuf	an input buffer to encode or decode
inlen	input buffer length
outbuf	an output buffer

Returns:

the number of bytes written to outbuf.