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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "AbstractDiskWriter.h"
#include "File.h"
#include "Util.h"
#include "message.h"
#include "LogFactory.h"
#include "Logger.h"
#include "DlAbortEx.h"
#include "a2io.h"
#include "StringFormat.h"
#include "DownloadFailureException.h"
#include <cerrno>
#include <cstring>
#include <cassert>
namespace aria2 {
AbstractDiskWriter::AbstractDiskWriter():
fd(-1),
logger(LogFactory::getInstance()) {}
AbstractDiskWriter::~AbstractDiskWriter()
{
closeFile();
}
void AbstractDiskWriter::openFile(const std::string& filename, uint64_t totalLength)
{
File f(filename);
if(f.exists()) {
openExistingFile(filename, totalLength);
} else {
initAndOpenFile(filename, totalLength);
}
}
void AbstractDiskWriter::closeFile()
{
if(fd >= 0) {
close(fd);
fd = -1;
}
}
void AbstractDiskWriter::openExistingFile(const std::string& filename,
uint64_t totalLength)
{
this->filename = filename;
File f(filename);
if(!f.exists()) {
throw DlAbortEx
(StringFormat(EX_FILE_OPEN, filename.c_str(), MSG_FILE_NOT_FOUND).str());
}
if((fd = open(filename.c_str(), O_RDWR|O_BINARY, OPEN_MODE)) < 0) {
throw DlAbortEx
(StringFormat(EX_FILE_OPEN, filename.c_str(), strerror(errno)).str());
}
}
void AbstractDiskWriter::createFile(const std::string& filename, int addFlags)
{
this->filename = filename;
assert(filename.size());
Util::mkdirs(File(filename).getDirname());
if((fd = open(filename.c_str(), O_CREAT|O_RDWR|O_TRUNC|O_BINARY|addFlags, OPEN_MODE)) < 0) {
throw DlAbortEx(StringFormat(EX_FILE_OPEN, filename.c_str(), strerror(errno)).str());
}
}
ssize_t AbstractDiskWriter::writeDataInternal(const unsigned char* data, size_t len)
{
ssize_t writtenLength = 0;
while((size_t)writtenLength < len) {
ssize_t ret = 0;
while((ret = write(fd, data+writtenLength, len-writtenLength)) == -1 && errno == EINTR);
if(ret == -1) {
return -1;
}
writtenLength += ret;
}
return writtenLength;
}
ssize_t AbstractDiskWriter::readDataInternal(unsigned char* data, size_t len)
{
ssize_t ret = 0;
while((ret = read(fd, data, len)) == -1 && errno == EINTR);
return ret;
}
void AbstractDiskWriter::seek(off_t offset)
{
if(offset != lseek(fd, offset, SEEK_SET)) {
throw DlAbortEx
(StringFormat(EX_FILE_SEEK, filename.c_str(), strerror(errno)).str());
}
}
void AbstractDiskWriter::writeData(const unsigned char* data, size_t len, off_t offset)
{
seek(offset);
if(writeDataInternal(data, len) < 0) {
// If errno is ENOSPC(not enough space in device), throw
// DownloadFailureException and abort download instantly.
if(errno == ENOSPC) {
throw DownloadFailureException
(StringFormat(EX_FILE_WRITE, filename.c_str(), strerror(errno)).str());
}
throw DlAbortEx(StringFormat(EX_FILE_WRITE, filename.c_str(), strerror(errno)).str());
}
}
ssize_t AbstractDiskWriter::readData(unsigned char* data, size_t len, off_t offset)
{
ssize_t ret;
seek(offset);
if((ret = readDataInternal(data, len)) < 0) {
throw DlAbortEx(StringFormat(EX_FILE_READ, filename.c_str(), strerror(errno)).str());
}
return ret;
}
void AbstractDiskWriter::truncate(uint64_t length)
{
if(fd == -1) {
throw DlAbortEx("File not opened.");
}
ftruncate(fd, length);
}
// TODO the file descriptor fd must be opened before calling this function.
uint64_t AbstractDiskWriter::size() const
{
if(fd == -1) {
throw DlAbortEx("File not opened.");
}
a2_struct_stat fileStat;
if(fstat(fd, &fileStat) < 0) {
return 0;
}
return fileStat.st_size;
}
void AbstractDiskWriter::enableDirectIO()
{
#ifdef ENABLE_DIRECT_IO
if(_directIOAllowed) {
int flg;
while((flg = fcntl(fd, F_GETFL)) == -1 && errno == EINTR);
while(fcntl(fd, F_SETFL, flg|O_DIRECT) == -1 && errno == EINTR);
}
#endif // ENABLE_DIRECT_IO
}
void AbstractDiskWriter::disableDirectIO()
{
#ifdef ENABLE_DIRECT_IO
int flg;
while((flg = fcntl(fd, F_GETFL)) == -1 && errno == EINTR);
while(fcntl(fd, F_SETFL, flg&(~O_DIRECT)) == -1 && errno == EINTR);
#endif // ENABLE_DIRECT_IO
}
} // namespace aria2
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