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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed 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.
*/
#include <cstdlib>
#include "memreader.hpp"
#include "mappedfile.hpp"
#include "stream3.hpp"
MemReader::MemReader(MappedFile *file, const vector<size_t> &offsets)
{
initRanges(file->getMapBeg(), file->getMapEnd(), offsets);
}
bool MemReader::read(Stream3 *stream)
{
if (ranges.empty())
return false;
readStream(stream, getLowestID());
removeEmptyRanges();
return true;
}
uint32_t MemReader::getLowestID() const
{
uint32_t lowestID = UINT32_MAX;
uint32_t rangeID;
for (size_t i = 0; i < ranges.size(); ++i) {
rangeID = Stream3::getIDFromMem(ranges[i].first);
if (rangeID < lowestID)
lowestID = rangeID;
}
return lowestID;
}
void MemReader::readStream(Stream3 *stream, uint32_t id)
{
stream->removeAllPackets();
stream->setID(id);
size_t len = 0;
for (size_t i = 0; i < ranges.size(); ++i) {
if (Stream3::getIDFromMem(ranges[i].first) == id) {
stream->addFromMemory(ranges[i].first, &len);
ranges[i].first += len;
}
}
}
void MemReader::removeEmptyRanges()
{
vector<pair <uint8_t *, uint8_t *> > original = ranges;
size_t destinationIdx = 0;
for (size_t i = 0; i < original.size(); ++i) {
if (original[i].first < original[i].second)
ranges[destinationIdx++] = original[i];
}
ranges.resize(destinationIdx);
}
void MemReader::initRanges(uint8_t *begin, uint8_t *end, const vector<size_t> &offsets)
{
ranges.resize(offsets.size());
totalLength = 0;
for (size_t i = 0; i < offsets.size(); ++i) {
ranges[i].first = begin + offsets[i];
if (i != offsets.size() - 1)
ranges[i].second = begin + offsets[i + 1];
else
ranges[i].second = end;
totalLength += ranges[i].second - ranges[i].first;
}
removeEmptyRanges();
}
size_t MemReader::getRangeLengths() const
{
size_t total = 0;
for (size_t i = 0; i < ranges.size(); ++i) {
total += ranges[i].second - ranges[i].first;
}
return total;
}
size_t MemReader::consumed() const
{
return totalLength - getRangeLengths();
}
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