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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2008, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* 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 St, Fifth Floor, Boston, *
* MA 02110-1301, USA. *
* *
**************************************************************************/
/* end stub */
#include "utilities/zstream.h"
namespace regina {
const int ZBuffer::zEOF = EOF;
std::streamsize ZBuffer::xsgetn(char* s, std::streamsize n) {
if (next == -1) {
int ans = gzread(file, s, n);
return (ans == -1 ? zEOF : ans);
} else {
*s = static_cast<char>(next);
int ans = gzread(file, s + 1, n - 1);
next = -1;
return (ans == -1 ? zEOF : ans + 1);
}
}
int ZBuffer::close() {
if (file) {
int ans = gzclose(file);
file = 0;
return (ans == Z_OK ? 0 : zEOF);
} else
return 0;
}
int ZBuffer::open(const char* path, const char* mode) {
if (file)
close();
file = gzopen(path, mode);
next = -1;
return (file ? 0 : zEOF);
}
void ZBuffer::showError(std::ostream& out) {
if (file) {
int err;
out << "(De)compression error: " << gzerror(file, &err) << std::endl;
} else
out << "(De)compression error: No open file." << std::endl;
}
} // namespace regina
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