jadams-tresys commented on a change in pull request #65: Added AIS layer with tests. Added tests matching to layer wiki page. URL: https://github.com/apache/incubator-daffodil/pull/65#discussion_r186414821
########## File path: daffodil-runtime1/src/main/scala/org/apache/daffodil/layers/AISTransformer.scala ########## @@ -0,0 +1,141 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.daffodil.layers + +import org.apache.daffodil.schema.annotation.props.gen.LayerLengthKind +import org.apache.daffodil.schema.annotation.props.gen.LayerLengthUnits +import org.apache.daffodil.util.Maybe +import org.apache.daffodil.processors.TermRuntimeData +import org.apache.daffodil.processors.LayerLengthInBytesEv +import org.apache.daffodil.processors.LayerBoundaryMarkEv +import org.apache.daffodil.processors.LayerCharsetEv +import org.apache.daffodil.processors.parsers.PState +import org.apache.daffodil.processors.unparsers.UState +import org.apache.daffodil.processors.charset.AIS_PAYLOAD_ARMORING +import java.nio._ +import java.nio.charset._ +import java.io._ +import org.apache.commons.io.IOUtils +import org.apache.daffodil.exceptions.Assert +import org.apache.daffodil.io.BoundaryMarkLimitingStream +import org.apache.daffodil.io.LayerBoundaryMarkInsertingJavaOutputStream + +object AISPayloadArmoringTransformer { + val iso8859 = StandardCharsets.ISO_8859_1 +} + +class AISPayloadArmoringTransformer() + extends LayerTransformer() { + import AISPayloadArmoringTransformer._ + + /** + * Decoding AIS payload armoring is encoding the ASCII text into the + * underlying binary data. + */ + override def wrapLayerDecoder(jis: java.io.InputStream) = { + new AISPayloadArmoringInputStream(jis) + } + + override def wrapLimitingStream(jis: java.io.InputStream, state: PState) = { + val layerBoundaryMark = "," + val s = BoundaryMarkLimitingStream(jis, layerBoundaryMark, iso8859) + s + } + + override protected def wrapLayerEncoder(jos: java.io.OutputStream): java.io.OutputStream = { + new AISPayloadArmoringOutputStream(jos) + } + + override protected def wrapLimitingStream(jos: java.io.OutputStream, state: UState): java.io.OutputStream = { + val layerBoundaryMark = "," + val newJOS = new LayerBoundaryMarkInsertingJavaOutputStream(jos, layerBoundaryMark, iso8859) + newJOS + } +} + +class AISPayloadArmoringInputStream(jis: InputStream) + extends InputStream { + import AISPayloadArmoringTransformer._ + + private lazy val enc = AIS_PAYLOAD_ARMORING.newEncoder() + + private lazy val bais = { + val armoredText = IOUtils.toString(jis, iso8859) + val cb = CharBuffer.wrap(armoredText) + + val numBytes = (6 * armoredText.length) / 8 Review comment: Just curious, but why 6 * armoredText.length? Is it due to the way the armoredText is encoded? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
