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/*
* Copyright 2019 Ericsson, https://www.ericsson.com/en
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.ericsson.mts.asn1.translator;
import com.ericsson.mts.asn1.BitArray;
import com.ericsson.mts.asn1.BitInputStream;
import com.ericsson.mts.asn1.PERTranscoder;
import com.ericsson.mts.asn1.TranslatorContext;
import com.ericsson.mts.asn1.exception.InvalidParameterException;
import com.ericsson.mts.asn1.exception.NotHandledCaseException;
import com.ericsson.mts.asn1.factory.FormatReader;
import com.ericsson.mts.asn1.factory.FormatWriter;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public class PERSequenceTranslator extends AbstractSequenceTranslator {
private PERTranscoder perTranscoder;
public PERSequenceTranslator(PERTranscoder perTranscoder) {
this.perTranscoder = perTranscoder;
}
@Override
public void doEncode(BitArray s, FormatReader reader, TranslatorContext translatorContext, List inputFieldList, Map registry) throws Exception {
logger.trace("Enter {} encoder, name {}, with input fields {}", this.getClass().getSimpleName(), this.name, inputFieldList);
if (hasEllipsis || optionalExtensionMarker || (extensionAndException != -1)) {
for (Field field : additionnalFieldList) {
if (inputFieldList.contains(field.getName())) {
throw new NotHandledCaseException();
}
}
s.writeBit(0);
}
//Build preamble (bit-map)
BigInteger preambleLength = BigInteger.ZERO;
for (Field field : fieldList) {
if (field.getOptionnal()) {
preambleLength = preambleLength.add(BigInteger.ONE);
if (inputFieldList.contains(field.getName())) {
s.writeBit(1);
} else {
s.writeBit(0);
}
}
}
if (preambleLength.compareTo(BigInteger.valueOf(65536)) > 0) {
throw new NotHandledCaseException("Preamble fragmentation");
}
for (Field field : fieldList) {
if (inputFieldList.contains(field.getName())) {
logger.trace("Encode field " + field.getName());
AbstractTranslator typeTranslator = field.getType();
List parameters = typeTranslator.getParameters();
if (parameters.isEmpty()) {
field.getType().encode(field.getName(), s, reader, translatorContext);
} else {
//Building parameter list to pass to target translator
List inputParameters = new ArrayList<>();
for (String parameter : field.getParameters()) {
inputParameters.add(registry.get(parameter));
}
typeTranslator.encode(field.getName(), s, reader, translatorContext, inputParameters);
}
} else {
if (!field.getOptionnal()) {
throw new InvalidParameterException("Sequence " + name + " need field " + field.getName());
}
}
}
}
@Override
public void doDecode(BitInputStream s, FormatWriter writer, TranslatorContext translatorContext, Map registry) throws Exception {
logger.trace("{} : {}", this.name, this);
boolean rootSequenceHasOptional = false;
boolean isExtendedSequence = false;
if (hasEllipsis || optionalExtensionMarker || (extensionAndException != -1)) {
isExtendedSequence = (1 == s.readBit());
}
logger.trace("{} : isExtendedSequence : {}", this.name, isExtendedSequence);
for (Field field : fieldList) {
if (field.getOptionnal()) {
rootSequenceHasOptional = true;
break;
}
}
if (rootSequenceHasOptional) {
for (int i = 0; i < optionalBitmap.length; i++) {
optionalBitmap[i] = (1 == s.readBit());
}
}
logger.trace("{} : optional bitmap is {}", this.name, optionalBitmap);
int optionalBitmapIndex = 0;
for (Field field : fieldList) {
if (!field.getOptionnal() || optionalBitmap[optionalBitmapIndex++]) {
logger.trace("{} : decode field {} ", this.name, field.getName());
AbstractTranslator typeTranslator = field.getType();
List parameters = typeTranslator.getParameters();
if (parameters.isEmpty()) {
typeTranslator.decode(field.getName(), s, writer, translatorContext);
} else {
//Building parameter list to pass to target translator
List inputParameters = new ArrayList<>();
for (String parameter : field.getParameters()) {
inputParameters.add(registry.get(parameter));
}
typeTranslator.decode(field.getName(), s, writer, translatorContext, inputParameters);
}
}
}
if (isExtendedSequence) {
logger.trace("{} : is and extended sequence", this.name);
int extensionsCount = perTranscoder.decodeNormallySmallNumber(s).intValueExact() + 1;
if (0 == extensionsCount) {
throw new IOException("\"n\" cannot be zero, as this procedure is only invoked if there is at least one extension addition being encoded");
}
logger.trace("{} : extensions count is {}", this.name, extensionsCount);
boolean[] additionalBitmap = new boolean[extensionsCount];
for (int i = 0; i < additionalBitmap.length; i++) {
additionalBitmap[i] = (1 == s.readBit());
}
logger.trace("{} : additional bitmap is {}", this.name, additionalBitmap);
// ALIGNED ONLY
if (perTranscoder.isAligned()) {
perTranscoder.skipAlignedBits(s);
}
Iterator additionalFieldsIterator = this.additionnalFieldList.iterator();
for (boolean additionalBit : additionalBitmap) {
Field field;
if (additionalFieldsIterator.hasNext()) {
field = additionalFieldsIterator.next();
} else {
field = null;
}
if (additionalBit) {
byte[] data = s.readAlignedByteArray(perTranscoder.decodeLengthDeterminant(s));
// TODO : decode for real (and display octetstring for unknown)
AbstractTranslator typeTranslator;
if (null != field) {
typeTranslator = field.getType();
List parameters = typeTranslator.getParameters();
if (parameters.isEmpty()) {
typeTranslator.decode(field.getName(), new BitInputStream(new ByteArrayInputStream(data)), writer, translatorContext);
} else {
throw new NotHandledCaseException("Case of extension with parameters not handled yet");
}
} else {
logger.error("skipped additional field of " + data.length + " bytes");
}
}
}
}
}
}
