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/*
* Copyright 2003-2017 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/FileInfo.hxx"
#include "system/Error.hxx"
#include "system/Open.hxx"
#include <assert.h>
#ifdef _WIN32
FileReader::FileReader(Path _path)
:path(_path),
handle(CreateFile(path.c_str(), GENERIC_READ, FILE_SHARE_READ,
nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
nullptr))
{
if (handle == INVALID_HANDLE_VALUE)
throw FormatLastError("Failed to open %s", path.ToUTF8().c_str());
}
FileInfo
FileReader::GetFileInfo() const
{
assert(IsDefined());
return FileInfo(path);
}
size_t
FileReader::Read(void *data, size_t size)
{
assert(IsDefined());
DWORD nbytes;
if (!ReadFile(handle, data, size, &nbytes, nullptr))
throw FormatLastError("Failed to read from %s",
path.ToUTF8().c_str());
return nbytes;
}
void
FileReader::Seek(off_t offset)
{
assert(IsDefined());
auto result = SetFilePointer(handle, offset, nullptr, FILE_BEGIN);
if (result == INVALID_SET_FILE_POINTER)
throw MakeLastError("Failed to seek");
}
void
FileReader::Skip(off_t offset)
{
assert(IsDefined());
auto result = SetFilePointer(handle, offset, nullptr, FILE_CURRENT);
if (result == INVALID_SET_FILE_POINTER)
throw MakeLastError("Failed to seek");
}
void
FileReader::Close() noexcept
{
assert(IsDefined());
CloseHandle(handle);
}
#else
FileReader::FileReader(Path _path)
:path(_path), fd(OpenReadOnly(path.c_str()))
{
}
FileInfo
FileReader::GetFileInfo() const
{
assert(IsDefined());
FileInfo info;
const bool success = fstat(fd.Get(), &info.st) == 0;
if (!success)
throw FormatErrno("Failed to access %s",
path.ToUTF8().c_str());
return info;
}
size_t
FileReader::Read(void *data, size_t size)
{
assert(IsDefined());
ssize_t nbytes = fd.Read(data, size);
if (nbytes < 0)
throw FormatErrno("Failed to read from %s", path.ToUTF8().c_str());
return nbytes;
}
void
FileReader::Seek(off_t offset)
{
assert(IsDefined());
auto result = fd.Seek(offset);
const bool success = result >= 0;
if (!success)
throw MakeErrno("Failed to seek");
}
void
FileReader::Skip(off_t offset)
{
assert(IsDefined());
auto result = fd.Skip(offset);
const bool success = result >= 0;
if (!success)
throw MakeErrno("Failed to seek");
}
void
FileReader::Close() noexcept
{
assert(IsDefined());
fd.Close();
}
#endif
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