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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 "PeekReader.hxx"
#include <algorithm>
#include <assert.h>
#include <string.h>
const void *
PeekReader::Peek(size_t size, Error &error)
{
assert(size > 0);
assert(size < sizeof(buffer));
assert(buffer_size == 0);
assert(buffer_position == 0);
do {
size_t nbytes = next.Read(buffer + buffer_size,
size - buffer_size, error);
if (nbytes == 0)
return nullptr;
buffer_size += nbytes;
} while (buffer_size < size);
return buffer;
}
size_t
PeekReader::Read(void *data, size_t size, Error &error)
{
size_t buffer_remaining = buffer_size - buffer_position;
if (buffer_remaining > 0) {
size_t nbytes = std::min(buffer_remaining, size);
memcpy(data, buffer + buffer_position, nbytes);
buffer_position += nbytes;
return nbytes;
}
return next.Read(data, size, error);
}
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