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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2007 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <strigi/dataeventinputstream.h>
#include <strigi/strigiconfig.h>
#include <iostream>
#include <cassert>
using namespace std;
using namespace Strigi;
DataEventInputStream::DataEventInputStream(InputStream *i,
DataEventHandler& h) :input(i), handler(h) {
assert(input->position() == 0);
m_size = input->size();
totalread = 0;
m_status = Ok;
finished = false;
}
int32_t
DataEventInputStream::read(const char*& start, int32_t min, int32_t max) {
// fprintf(stderr, "input->position(): %lli\n", input->position());
int32_t nread = input->read(start, min, max);
// fprintf(stderr, "%p pos: %lli min %i max %i nread %i\n", this, m_position, min, max, nread);
if (nread < -1) {
m_error = input->error();
m_status = Error;
return -2;
}
if (nread > 0) {
// ignore bytes that might have been added since the file size was
// determined
if (m_size != -1 && m_position + nread > m_size) {
nread = m_size - m_position;
}
m_position += nread;
// value of -1 for totalread means data should not be reported anymore
if (totalread != -1 && totalread < m_position) {
int32_t amount = (int32_t)(m_position - totalread);
bool wantMore = handler.handleData(start + nread - amount, amount);
if (wantMore) {
totalread = m_position;
} else {
totalread = -1;
}
}
}
if (nread < min) {
m_status = Eof;
if (m_size == -1) {
// fprintf(stderr, "set m_size: %lli\n", m_position);
m_size = m_position;
}
#ifndef NDEBUG
if (totalread != -1 && (m_size != m_position || m_size != totalread)) {
cerr << "m_size: " << m_size << " m_position: " << m_position
<< " totalread: " << totalread << " nread: " << nread << endl;
cerr << input->status() << " " << input->error() << endl;
}
#endif
assert(m_size == m_position);
assert(totalread == -1 || totalread == m_size);
if (!finished) {
finish();
finished = true;
}
}
return nread;
}
int64_t
DataEventInputStream::skip(int64_t ntoskip) {
int64_t skipped;
if (totalread == -1) { // done reporting, we can use fast skipping
skipped = input->skip(ntoskip);
m_status = input->status();
m_position = input->position();
m_size = input->size();
} else {
// we call the default implementation because it calls
// read() which is required for sending the signals
skipped = InputStream::skip(ntoskip);
}
return skipped;
}
int64_t
DataEventInputStream::reset(int64_t np) {
// fprintf(stderr, "DataEventInputStream::reset from %lli to %lli.\n", m_position, np);
if (np > m_position) {
// advance to the new position, using skip ensure we actually read
// the files
skip(np - m_position);
return m_position;
}
// fprintf(stderr, "DataEventInputStream::reset\n");
int64_t newpos = input->reset(np);
if (newpos < 0) {
m_status = Error;
m_error = input->error();
} else {
m_status = (newpos == m_size) ?Eof :Ok;
}
// fprintf(stderr, "np %lli newpos %lli status %i\n", np, newpos, m_status);
m_position = newpos;
return newpos;
}
void
DataEventInputStream::finish() {
handler.handleEnd();
}
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