78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*bitSetUtil.cpp*/
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/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* EPICS pvDataCPP is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*/
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#include <pv/noDefaultMethods.h>
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#include <pv/pvData.h>
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#include <pv/bitSetUtil.h>
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namespace epics { namespace pvData {
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static bool checkBitSetPVField(
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PVField *pvField,BitSet *bitSet,int initialOffset)
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{
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bool atLeastOneBitSet = false;
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bool allBitsSet = true;
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int offset = initialOffset;
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int nbits = pvField->getNumberFields();
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if(nbits==1) return bitSet->get(offset);
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int nextSetBit = bitSet->nextSetBit(offset);
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if(nextSetBit>=(offset+nbits)) return false;
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if(bitSet->get(offset)) {
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if(nbits>1) {
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for(int i=offset+1; i<offset+nbits; i++) bitSet->clear(i);
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}
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return true;
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}
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PVStructure *pvStructure = static_cast<PVStructure *>(pvField);
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while(offset<initialOffset + nbits) {
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PVField *pvSubField = pvStructure->getSubField(offset);
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int nbitsNow = pvSubField->getNumberFields();
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if(nbitsNow==1) {
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if(bitSet->get(offset)) {
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atLeastOneBitSet = true;
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} else {
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allBitsSet = false;
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}
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offset++;
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} else {
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offset++;
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PVStructure *pvSubStructure = static_cast<PVStructure*>(pvField);
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PVFieldPtrArray pvSubStructureFields =
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pvSubStructure->getPVFields();
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int num = pvSubStructure->getStructure()->getNumberFields();
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for(int i=0; i<num; i++) {
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PVField *pvSubSubField = pvSubStructureFields[i];
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bool result = checkBitSetPVField(pvSubSubField,bitSet,offset);
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if(result) {
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atLeastOneBitSet = true;
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if(!bitSet->get(offset)) {
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allBitsSet = false;
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}
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} else {
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allBitsSet = false;
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}
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offset += pvSubSubField->getNumberFields();
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}
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}
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}
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if(allBitsSet) {
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if(nbits>1) {
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for(int i=initialOffset+1; i<initialOffset+nbits; i++){
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bitSet->clear(i);
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}
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}
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bitSet->set(initialOffset);
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}
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return atLeastOneBitSet;
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}
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bool BitSetUtil::compress(BitSet *bitSet,PVStructure *pvStructure)
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{
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return checkBitSetPVField(pvStructure,bitSet,0);
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}
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}}
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