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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2009 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 "mmapfileinputstream.h"
#include <config.h>
#include <strigi/strigiconfig.h>
#include <fcntl.h>
#include <cerrno>
#include <cstring>
#include <sys/mman.h>
#include <sys/stat.h>
#include <algorithm>
using namespace Strigi;
using namespace std;
MMapFileInputStream::MMapFileInputStream(const char* filepath) {
int fd = ::open(filepath, O_RDONLY);
struct stat sb;
if (fd == -1 || fstat(fd, &sb) == -1) {
// handle error
buffer = 0;
m_error = "Could not read file '";
m_error += filepath;
m_error += "': ";
m_error += strerror(errno);
m_status = Error;
close(fd);
return;
}
m_size = sb.st_size;
if (m_size > 0) {
buffer = (const char*)mmap(NULL, m_size, PROT_READ, MAP_PRIVATE, fd, 0);
} else {
buffer = 0;
}
close(fd);
if (buffer == (const char*)MAP_FAILED) {
// handle error
buffer = 0;
m_error = "Could not read file '";
m_error += filepath;
m_error += "': ";
m_error += strerror(errno);
m_status = Error;
return;
}
}
MMapFileInputStream::~MMapFileInputStream() {
if (buffer) {
munmap((void*)buffer, m_size);
}
}
int32_t
MMapFileInputStream::read(const char*& start, int32_t _min, int32_t _max) {
if (m_status == Error) return -2;
if (m_status == Eof) return -1;
int32_t n = max(_min, _max);
if (n >= m_size - m_position) {
m_status = Eof;
n = (int32_t)(m_size - m_position);
}
start = buffer + m_position;
m_position += n;
return n;
}
int64_t
MMapFileInputStream::skip(int64_t ntoskip) {
if (ntoskip >= m_size - m_position) {
ntoskip = m_size - m_position;
m_status = Eof;
}
m_position += ntoskip;
return ntoskip;
}
int64_t
MMapFileInputStream::reset(int64_t pos) {
if (m_status == Error) return -2;
if (pos >= m_size) {
m_status = Eof;
m_position = m_size;
} else if (pos < 0) {
m_position = 0;
m_status = Ok;
} else {
m_position = pos;
m_status = Ok;
}
return m_position;
}
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