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/*
* Copyright (C) 2004-2012 Geometer Plus <contact@geometerplus.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <ZLFile.h>
#include <ZLZDecompressor.h>
#include "ZTXTStream.h"
ZTXTStream::ZTXTStream(const ZLFile &file) : PdbStream(file) {
}
ZTXTStream::~ZTXTStream() {
close();
}
bool ZTXTStream::open() {
if (!PdbStream::open()) {
return false;
}
myBase->seek(2, false);
unsigned short recordNumber;
PdbUtil::readUnsignedShort(*myBase, recordNumber);
myMaxRecordIndex = std::min(recordNumber, (unsigned short)(header().Offsets.size() - 1));
myBase->seek(4, false);
PdbUtil::readUnsignedShort(*myBase, myMaxRecordSize);
if (myMaxRecordSize == 0) {
return false;
}
myBuffer = new char[myMaxRecordSize];
myRecordIndex = 0;
return true;
}
bool ZTXTStream::fillBuffer() {
while (myBufferOffset == myBufferLength) {
if (myRecordIndex + 1 > myMaxRecordIndex) {
return false;
}
++myRecordIndex;
std::size_t currentOffset = recordOffset(myRecordIndex);
// Hmm, this works on examples from manybooks.net,
// but I don't understand what this code means :((
if (myRecordIndex == 1) {
currentOffset += 2;
}
if (currentOffset < myBase->offset()) {
return false;
}
myBase->seek(currentOffset, true);
const std::size_t nextOffset = recordOffset(myRecordIndex + 1);
if (nextOffset < currentOffset) {
return false;
}
myBufferLength = ZLZDecompressor(nextOffset - currentOffset).decompress(*myBase, myBuffer, myMaxRecordSize);
myBufferOffset = 0;
}
return true;
}
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