71f0ed8b74
This eliminates some overhead, because the compiler doesn't need to consider these functions throwing.
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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* Copyright 2003-2017 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 "config.h"
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#include "AutoGunzipReader.hxx"
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#include "GunzipReader.hxx"
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AutoGunzipReader::~AutoGunzipReader()
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{
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delete gunzip;
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}
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gcc_pure
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static bool
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IsGzip(const uint8_t data[4]) noexcept
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{
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return data[0] == 0x1f && data[1] == 0x8b && data[2] == 0x08 &&
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(data[3] & 0xe0) == 0;
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}
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inline void
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AutoGunzipReader::Detect()
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{
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const uint8_t *data = (const uint8_t *)peek.Peek(4);
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if (data == nullptr) {
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next = &peek;
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return;
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}
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if (IsGzip(data))
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next = gunzip = new GunzipReader(peek);
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else
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next = &peek;
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}
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size_t
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AutoGunzipReader::Read(void *data, size_t size)
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{
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if (next == nullptr)
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Detect();
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assert(next != nullptr);
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return next->Read(data, size);
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}
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