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/*
* Copyright (C) 2008-2012 Geometer Plus <[email protected]>
*
* 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 "MergedStream.h"
bool MergedStream::open() {
close();
resetToStart();
myOffset = 0;
myCurrentStream = nextStream();
return !myCurrentStream.isNull() && myCurrentStream->open();
}
std::size_t MergedStream::read(char *buffer, std::size_t maxSize) {
std::size_t bytesToRead = maxSize;
while ((bytesToRead > 0) && !myCurrentStream.isNull()) {
std::size_t len = myCurrentStream->read(buffer, bytesToRead);
bytesToRead -= len;
if (buffer != 0) {
buffer += len;
}
if (bytesToRead != 0) {
if (buffer != 0) {
*buffer++ = '\n';
}
bytesToRead--;
myCurrentStream = nextStream();
if (myCurrentStream.isNull() || !myCurrentStream->open()) {
break;
}
}
}
myOffset += maxSize - bytesToRead;
return maxSize - bytesToRead;
}
void MergedStream::close() {
myCurrentStream.reset();
}
void MergedStream::seek(int offset, bool absoluteOffset) {
// works for nonnegative offsets only
if (absoluteOffset) {
offset -= myOffset;
}
read(0, offset);
}
std::size_t MergedStream::offset() const {
return myOffset;
}
std::size_t MergedStream::sizeOfOpened() {
// coudn't be implemented
return 0;
}
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