Decode decodes src into dst, returning both the number of bytes written to dst and the number consumed from src. If src contains invalid ascii85 data, Decode will return the number of bytes successfully written and a CorruptInputError. Decode ignores space and control characters in src. Often, ascii85-encoded data is wrapped in <~ and ~> symbols. Decode expects these to have been stripped by the caller.

If flush is true, Decode assumes that src represents the end of the input stream and processes it completely rather than wait for the completion of another 32-bit block.

NewDecoder wraps an io.Reader interface around Decode.