tutils.h
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/***************************************************************************
copyright : (C) 2013 by Tsuda Kageyu
email : tsuda.kageyu@gmail.com
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#ifndef TAGLIB_TUTILS_H
#define TAGLIB_TUTILS_H
// THIS FILE IS NOT A PART OF THE TAGLIB API
#ifndef DO_NOT_DOCUMENT // tell Doxygen not to document this header
#include <cstdint>
#include <cstdio>
#include <cstdarg>
#include <cstring>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if defined(HAVE_MSC_BYTESWAP)
# include <stdlib.h>
#elif defined(HAVE_GLIBC_BYTESWAP)
# include <byteswap.h>
#elif defined(HAVE_MAC_BYTESWAP)
# include <libkern/OSByteOrder.h>
#elif defined(HAVE_OPENBSD_BYTESWAP)
# include <sys/endian.h>
#endif
#include "tstring.h"
namespace TagLib
{
namespace Utils
{
namespace
{
inline uint16_t byteSwap(uint16_t x)
{
#if defined(HAVE_GCC_BYTESWAP)
return __builtin_bswap16(x);
#elif defined(HAVE_MSC_BYTESWAP)
return _byteswap_ushort(x);
#elif defined(HAVE_GLIBC_BYTESWAP)
return __bswap_16(x);
#elif defined(HAVE_MAC_BYTESWAP)
return OSSwapInt16(x);
#elif defined(HAVE_OPENBSD_BYTESWAP)
return swap16(x);
#else
return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
#endif
}
inline uint32_t byteSwap(uint32_t x)
{
#if defined(HAVE_GCC_BYTESWAP)
return __builtin_bswap32(x);
#elif defined(HAVE_MSC_BYTESWAP)
return _byteswap_ulong(x);
#elif defined(HAVE_GLIBC_BYTESWAP)
return __bswap_32(x);
#elif defined(HAVE_MAC_BYTESWAP)
return OSSwapInt32(x);
#elif defined(HAVE_OPENBSD_BYTESWAP)
return swap32(x);
#else
return ((x & 0xff000000u) >> 24)
| ((x & 0x00ff0000u) >> 8)
| ((x & 0x0000ff00u) << 8)
| ((x & 0x000000ffu) << 24);
#endif
}
inline uint64_t byteSwap(uint64_t x)
{
#if defined(HAVE_GCC_BYTESWAP)
return __builtin_bswap64(x);
#elif defined(HAVE_MSC_BYTESWAP)
return _byteswap_uint64(x);
#elif defined(HAVE_GLIBC_BYTESWAP)
return __bswap_64(x);
#elif defined(HAVE_MAC_BYTESWAP)
return OSSwapInt64(x);
#elif defined(HAVE_OPENBSD_BYTESWAP)
return swap64(x);
#else
return ((x & 0xff00000000000000ull) >> 56)
| ((x & 0x00ff000000000000ull) >> 40)
| ((x & 0x0000ff0000000000ull) >> 24)
| ((x & 0x000000ff00000000ull) >> 8)
| ((x & 0x00000000ff000000ull) << 8)
| ((x & 0x0000000000ff0000ull) << 24)
| ((x & 0x000000000000ff00ull) << 40)
| ((x & 0x00000000000000ffull) << 56);
#endif
}
inline String formatString(const char *format, ...)
{
// Sufficient buffer size for the current internal uses.
// Consider changing this value when you use this function.
static const size_t BufferSize = 128;
va_list args;
va_start(args, format);
char buf[BufferSize];
int length;
length = std::vsnprintf(buf, BufferSize, format, args);
va_end(args);
if(length > 0)
return String(buf);
return String();
}
enum ByteOrder
{
LittleEndian,
BigEndian
};
constexpr ByteOrder systemByteOrder()
{
constexpr union IntCharUnion {
int i;
char c;
constexpr IntCharUnion(int j) : i(j) {}
} u{1};
if(u.c == 1)
return LittleEndian;
return BigEndian;
}
} // namespace
} // namespace Utils
} // namespace TagLib
#endif
#endif
TagLib
A namespace for all TagLib related classes and functions.
Definition apefile.h:41
tstring.h