79 lines
2.3 KiB
C++
79 lines
2.3 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 pvData 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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/**
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* @author mrk
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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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using std::tr1::static_pointer_cast;
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using std::size_t;
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static bool checkBitSetPVField(
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PVFieldPtr const &pvField,BitSetPtr const &bitSet,int32 initialOffset)
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{
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int32 offset = initialOffset;
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int32 nbits = pvField->getNumberFields();
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if(nbits==1) return bitSet->get(offset);
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int32 nextSetBit = bitSet->nextSetBit(offset);
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if(nextSetBit>=(offset+nbits)) return false;
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if(nextSetBit<0) return false;
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if(bitSet->get(offset)) {
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if(nbits>1) {
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for(int32 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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bool atLeastOneBitSet = false;
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bool allBitsSet = true;
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PVStructurePtr pvStructure = static_pointer_cast<PVStructure>(pvField);
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offset = pvStructure->getFieldOffset() + 1;
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while(offset<initialOffset + nbits) {
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PVFieldPtr pvSubField = pvStructure->getSubField(offset);
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int32 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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bool result = checkBitSetPVField(pvSubField,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 += pvSubField->getNumberFields();
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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(int32 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(BitSetPtr const &bitSet,PVStructurePtr const &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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