/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "FileReader.hxx"
#include "fs/FileSystem.hxx"
#include "util/Error.hxx"
#ifdef WIN32
FileReader::FileReader(Path _path, Error &error)
:path(_path),
handle(CreateFile(path.c_str(), GENERIC_READ, FILE_SHARE_READ,
nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
nullptr))
{
if (handle == INVALID_HANDLE_VALUE) {
const auto path_utf8 = path.ToUTF8();
error.FormatLastError("Failed to open %s", path_utf8.c_str());
}
}
size_t
FileReader::Read(void *data, size_t size, Error &error)
{
assert(IsDefined());
DWORD nbytes;
if (!ReadFile(handle, data, size, &nbytes, nullptr)) {
const auto path_utf8 = path.ToUTF8();
error.FormatLastError("Failed to read from %s",
path_utf8.c_str());
nbytes = 0;
}
return nbytes;
}
bool
FileReader::Seek(off_t offset, Error &error)
{
assert(IsDefined());
auto result = SetFilePointer(handle, offset, nullptr, FILE_BEGIN);
const bool success = result != INVALID_SET_FILE_POINTER;
if (!success)
error.SetLastError("Failed to seek");
return success;
}
void
FileReader::Close()
{
assert(IsDefined());
CloseHandle(handle);
}
#else
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
FileReader::FileReader(Path _path, Error &error)
:path(_path),
fd(OpenFile(path,
O_RDONLY,
0))
{
if (fd < 0)
error.FormatErrno("Failed to open %s", path.c_str());
}
size_t
FileReader::Read(void *data, size_t size, Error &error)
{
assert(IsDefined());
ssize_t nbytes = read(fd, data, size);
if (nbytes < 0) {
error.FormatErrno("Failed to read from %s", path.c_str());
nbytes = 0;
}
return nbytes;
}
bool
FileReader::Seek(off_t offset, Error &error)
{
assert(IsDefined());
auto result = lseek(fd, offset, SEEK_SET);
const bool success = result >= 0;
if (!success)
error.SetErrno("Failed to seek");
return success;
}
void
FileReader::Close()
{
assert(IsDefined());
close(fd);
fd = -1;
}
#endif
