[GitHub] mbeckerle opened a new pull request #61: Preliminary Review - Base64 layering runs first parsing unit test.

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mbeckerle opened a new pull request #61: Preliminary Review - Base64 layering runs first parsing unit test.
URL: https://github.com/apache/incubator-daffodil/pull/61
 
 
   (Not expecting approval here. Just looking for early feedback on how this is looking.)
   
   All properties for Base64/layering implemented.
   
   Only layerLengthKind 'explicit' and 'delimited' are allowed now, as
   those are the only use cases we have.
   
   Layers allowed are base64, base64_MIME, base64_URLSAFE,
   gzip, compress, ais.
   
   The base64 cases could be explicit, but known examples are delimited.
   The gzip/compress comes from mil-std-2045 headers, and those have
   explicit length.
   AIS is delimited.
   (For future: ASN.1 Object ID encoding has explicit length.)
   
   Mostly characterized with tests, what is needed in order to implement
   stream filters that impose terminators that are scanned for - using
   Java's Scanner class.
   
   Java's scanner class saves us the hassle of block filling/enlarging,
   etc. that is otherwise necessary when you want to use the regex
   libraries against a stream.
   
   Also put catch for ClassNotFound around compiler.reload for Java 7 vs.
   Java 8. Base64 needs Java 8 classes.
   
   Identified a couple cleanups where java.io.HashMap can be replaced with
   our NonAllocatingMap - which uses Maybe types instead of null/notNull.
   
   Added a charset so we can use the encoder to unparse AIS data that must
   be armored with AIS_PAYLOAD_ARMORING 6 bit to 8 bit.
   
   This is all part of layering, i.e., AIS format requires layering as does
   base64, so merging this all onto same branch.
   
   DAFFODIL-1734, DAFFODIL-1805

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