Construct the stream reader.
Assert that there is a current segment.
Change the encoding used to read the underlying EDI data stream. #mark() should
have been called fir
Get the current EDI segment fields.
Get the current segment "number". The first segment is "segment number 1".
Get the current delimiter set.
Get the segment buffer.
Does the read have a segment buffered and ready for processing.
Try mark the stream so we can support changing of the reader encoding.
Move to the next EDI segment. Simply reads and buffers the next EDI segment.
Peek a fixed number of characters from the input source. Peek differs from
#read(int) in that it lea