60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "PeekReader.hxx"
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#include <algorithm>
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#include <cassert>
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#include <string.h>
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const void *
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PeekReader::Peek(size_t size)
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{
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assert(size > 0);
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assert(size < sizeof(buffer));
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assert(buffer_size == 0);
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assert(buffer_position == 0);
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do {
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size_t nbytes = next.Read(buffer + buffer_size,
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size - buffer_size);
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if (nbytes == 0)
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return nullptr;
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buffer_size += nbytes;
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} while (buffer_size < size);
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return buffer;
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}
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size_t
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PeekReader::Read(void *data, size_t size)
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{
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size_t buffer_remaining = buffer_size - buffer_position;
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if (buffer_remaining > 0) {
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size_t nbytes = std::min(buffer_remaining, size);
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memcpy(data, buffer + buffer_position, nbytes);
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buffer_position += nbytes;
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return nbytes;
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}
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return next.Read(data, size);
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}
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