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/*
* 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.
*/
#ifndef MPD_BUFFERED_OUTPUT_STREAM_HXX
#define MPD_BUFFERED_OUTPUT_STREAM_HXX
#include "check.h"
#include "Compiler.h"
#include "util/DynamicFifoBuffer.hxx"
#include "util/Error.hxx"
#include <stddef.h>
class OutputStream;
class Error;
/**
* An #OutputStream wrapper that buffers its output to reduce the
* number of OutputStream::Write() calls.
*
* It simplifies error handling by managing an #Error attribute.
* Invoke any number of writes, and check for errors in the end using
* Check().
*/
class BufferedOutputStream {
OutputStream &os;
DynamicFifoBuffer<char> buffer;
Error last_error;
public:
BufferedOutputStream(OutputStream &_os)
:os(_os), buffer(32768) {}
bool Write(const void *data, size_t size);
bool Write(const char *p);
gcc_printf(2,3)
bool Format(const char *fmt, ...);
/**
* Returns false if an error has occurred.
*/
gcc_pure
bool Check() const {
return !last_error.IsDefined();
}
/**
* Returns false if an error has occurred. In that case, a
* copy of the #Error is returned.
*/
bool Check(Error &error) const {
if (last_error.IsDefined()) {
error.Set(last_error);
return false;
} else
return true;
}
/**
* Write buffer contents to the #OutputStream.
*/
bool Flush();
bool Flush(Error &error);
private:
bool AppendToBuffer(const void *data, size_t size);
};
#endif
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