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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.
*/
#include "config.h"
#include "BufferedOutputStream.hxx"
#include "OutputStream.hxx"
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
bool
BufferedOutputStream::AppendToBuffer(const void *data, size_t size)
{
auto r = buffer.Write();
if (r.size < size)
return false;
memcpy(r.data, data, size);
buffer.Append(size);
return true;
}
bool
BufferedOutputStream::Write(const void *data, size_t size)
{
if (gcc_unlikely(last_error.IsDefined()))
/* the stream has already failed */
return false;
/* try to append to the current buffer */
if (AppendToBuffer(data, size))
return true;
/* not enough room in the buffer - flush it */
if (!Flush())
return false;
/* see if there's now enough room */
if (AppendToBuffer(data, size))
return true;
/* too large for the buffer: direct write */
return os.Write(data, size, last_error);
}
bool
BufferedOutputStream::Write(const char *p)
{
return Write(p, strlen(p));
}
bool
BufferedOutputStream::Format(const char *fmt, ...)
{
if (gcc_unlikely(last_error.IsDefined()))
return false;
auto r = buffer.Write();
if (r.IsEmpty()) {
if (!Flush())
return false;
r = buffer.Write();
}
/* format into the buffer */
va_list ap;
va_start(ap, fmt);
size_t size = vsnprintf(r.data, r.size, fmt, ap);
va_end(ap);
if (gcc_unlikely(size >= r.size)) {
/* buffer was not large enough; flush it and try
again */
if (!Flush())
return false;
r = buffer.Write();
if (gcc_unlikely(size >= r.size)) {
/* still not enough space: grow the buffer and
try again */
r.size = size + 1;
r.data = buffer.Write(r.size);
}
/* format into the new buffer */
va_start(ap, fmt);
size = vsnprintf(r.data, r.size, fmt, ap);
va_end(ap);
/* this time, it must fit */
assert(size < r.size);
}
buffer.Append(size);
return true;
}
bool
BufferedOutputStream::Flush()
{
if (!Check())
return false;
auto r = buffer.Read();
if (r.IsEmpty())
return true;
bool success = os.Write(r.data, r.size, last_error);
if (gcc_likely(success))
buffer.Consume(r.size);
return success;
}
bool
BufferedOutputStream::Flush(Error &error)
{
if (!Check(error))
return false;
auto r = buffer.Read();
if (r.IsEmpty())
return true;
bool success = os.Write(r.data, r.size, error);
if (gcc_likely(success))
buffer.Consume(r.size);
return success;
}
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