cfsa1_impl.hpp
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/*
* File: cfsa1_impl.hpp
* Author: mlenart
*
* Created on November 4, 2013, 1:08 PM
*/
#ifndef CFSA1_IMPL_HPP
#define CFSA1_IMPL_HPP
#include <vector>
#include "fsa.hpp"
using namespace std;
#pragma pack(push, 1) /* push current alignment to stack */
struct StateData2 {
unsigned transitionsNum: 6;
unsigned array : 1;
unsigned accepting : 1;
};
struct TransitionData2 {
unsigned offsetSize : 2;
unsigned shortLabel : 6;
};
#pragma pack(pop) /* restore original alignment from stack */
static const unsigned int INITIAL_STATE_OFFSET = 257;
template <class T>
vector<unsigned char> CompressedFSA1<T>::initializeChar2PopularCharIdx(const unsigned char* ptr) {
return vector<unsigned char>(ptr, ptr + INITIAL_STATE_OFFSET);
}
template <class T>
CompressedFSA1<T>::CompressedFSA1(const unsigned char* ptr, const Deserializer<T>& deserializer)
: FSA<T>(ptr + INITIAL_STATE_OFFSET, deserializer),
label2ShortLabel(initializeChar2PopularCharIdx(ptr)) {
}
template <class T>
CompressedFSA1<T>::~CompressedFSA1() {
}
template <class T>
void CompressedFSA1<T>::reallyDoProceed(
const unsigned char* statePtr,
State<T>& state) const {
// const unsigned char stateByte = *statePtr;
const StateData2* sd = reinterpret_cast<const StateData2*>(statePtr);
if (sd->accepting) {
// cerr << "ACCEPTING" << endl;
T object;
long size = this->deserializer.deserialize(statePtr + 1, object);
state.setNext(statePtr - this->initialStatePtr, object, size);
}
else {
state.setNext(statePtr - this->initialStatePtr);
}
}
template <class T>
void CompressedFSA1<T>::doProceedToNextByList(
const char c,
const unsigned char shortLabel,
const unsigned char* ptr,
const unsigned int transitionsNum,
State<T>& state) const {
register const unsigned char* currPtr = ptr;
// TransitionData* foundTransition = (TransitionData*) (fromPointer + transitionsTableOffset);
bool found = false;
TransitionData2 td;
for (unsigned int i = 0; i < transitionsNum; i++) {
// const_cast<Counter*>(&counter)->increment(1);
td = *(reinterpret_cast<const TransitionData2*>(currPtr));
if (td.shortLabel == shortLabel) {
if (shortLabel == 0) {
currPtr++;
char label = (char) *currPtr;
if (label == c) {
found = true;
break;
}
else {
currPtr += td.offsetSize + 1;
}
} else {
found = true;
break;
}
}
else {
if (td.shortLabel == 0) {
currPtr++;
}
currPtr += td.offsetSize + 1;
}
}
// const_cast<Counter*>(&counter)->increment(foundTransition - transitionsStart + 1);
if (!found) {
// cerr << "SINK for " << c << endl;
state.setNextAsSink();
}
else {
currPtr++;
// cerr << "offset size " << td.offsetSize << endl;
// cerr << "offset " << offset << endl;
switch (td.offsetSize) {
case 0:
break;
case 1:
currPtr += *currPtr + 1;
break;
case 2:
currPtr += ntohs(*((uint16_t*) currPtr)) + 2;
break;
case 3:
currPtr += (((unsigned int) ntohs(*((uint16_t*) currPtr))) << 8) + currPtr[2] + 3;
break;
}
// cerr << "FOUND " << c << " " << currPtr - this->startPtr << endl;
reallyDoProceed(currPtr, state);
}
}
template <class T>
void CompressedFSA1<T>::doProceedToNextByArray(
const unsigned char shortLabel,
const uint32_t* ptr,
State<T>& state) const {
uint32_t offset = ntohl(ptr[shortLabel]);
if (offset != 0) {
const unsigned char* currPtr = this->initialStatePtr + offset;
reallyDoProceed(currPtr, state);
}
else {
state.setNextAsSink();
}
}
template <class T>
void CompressedFSA1<T>::proceedToNext(const char c, State<T>& state) const {
// if (c <= 'z' && 'a' <= c)
// cerr << "NEXT " << c << " from " << state.getOffset() << endl;
// else
// cerr << "NEXT " << (short) c << " from " << state.getOffset() << endl;
const unsigned char* fromPointer = this->initialStatePtr + state.getOffset();
unsigned char shortLabel = this->label2ShortLabel[(const unsigned char) c];
unsigned long transitionsTableOffset = 1;
if (state.isAccepting()) {
transitionsTableOffset += state.getValueSize();
// cerr << "transitionsTableOffset " << transitionsTableOffset + state.getOffset() << " because value is " << state.getValue() << endl;
}
const StateData2* sd = reinterpret_cast<const StateData2*>(fromPointer);
// cerr << "transitions num=" << sd->transitionsNum << endl;
if (sd->array) {
if (shortLabel > 0) {
this->doProceedToNextByArray(
shortLabel,
reinterpret_cast<const uint32_t*>(fromPointer + transitionsTableOffset),
state);
}
else {
reallyDoProceed(fromPointer + transitionsTableOffset + 256, state);
proceedToNext(c, state);
}
}
else {
this->doProceedToNextByList(
c,
shortLabel,
fromPointer + transitionsTableOffset,
sd->transitionsNum,
state);
}
}
#endif /* CFSA1_IMPL_HPP */