244 lines
5.9 KiB
C++
244 lines
5.9 KiB
C++
/***************************************************************************
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copyright : (C) 2013 by Tsuda Kageyu
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email : tsuda.kageyu@gmail.com
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#ifndef TAGLIB_TUTILS_H
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#define TAGLIB_TUTILS_H
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// THIS FILE IS NOT A PART OF THE TAGLIB API
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#ifndef DO_NOT_DOCUMENT // tell Doxygen not to document this header
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if defined(HAVE_MSC_BYTESWAP)
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# include <stdlib.h>
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#elif defined(HAVE_GLIBC_BYTESWAP)
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# include <byteswap.h>
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#elif defined(HAVE_MAC_BYTESWAP)
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# include <libkern/OSByteOrder.h>
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#elif defined(HAVE_OPENBSD_BYTESWAP)
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# include <sys/endian.h>
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#endif
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#include <tstring.h>
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#include <cstdio>
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#include <cstdarg>
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#include <cstring>
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namespace TagLib
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{
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namespace Utils
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{
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namespace
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{
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/*!
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* Reverses the order of bytes in an 16-bit integer.
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*/
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inline unsigned short byteSwap(unsigned short x)
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{
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#if defined(HAVE_GCC_BYTESWAP)
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return __builtin_bswap16(x);
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#elif defined(HAVE_MSC_BYTESWAP)
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return _byteswap_ushort(x);
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#elif defined(HAVE_GLIBC_BYTESWAP)
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return __bswap_16(x);
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#elif defined(HAVE_MAC_BYTESWAP)
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return OSSwapInt16(x);
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#elif defined(HAVE_OPENBSD_BYTESWAP)
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return swap16(x);
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#else
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return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
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#endif
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}
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/*!
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* Reverses the order of bytes in an 32-bit integer.
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*/
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inline unsigned int byteSwap(unsigned int x)
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{
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#if defined(HAVE_GCC_BYTESWAP)
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return __builtin_bswap32(x);
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#elif defined(HAVE_MSC_BYTESWAP)
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return _byteswap_ulong(x);
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#elif defined(HAVE_GLIBC_BYTESWAP)
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return __bswap_32(x);
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#elif defined(HAVE_MAC_BYTESWAP)
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return OSSwapInt32(x);
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#elif defined(HAVE_OPENBSD_BYTESWAP)
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return swap32(x);
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#else
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return ((x & 0xff000000u) >> 24)
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| ((x & 0x00ff0000u) >> 8)
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| ((x & 0x0000ff00u) << 8)
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| ((x & 0x000000ffu) << 24);
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#endif
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}
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/*!
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* Reverses the order of bytes in an 64-bit integer.
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*/
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inline unsigned long long byteSwap(unsigned long long x)
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{
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#if defined(HAVE_GCC_BYTESWAP)
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return __builtin_bswap64(x);
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#elif defined(HAVE_MSC_BYTESWAP)
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return _byteswap_uint64(x);
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#elif defined(HAVE_GLIBC_BYTESWAP)
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return __bswap_64(x);
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#elif defined(HAVE_MAC_BYTESWAP)
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return OSSwapInt64(x);
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#elif defined(HAVE_OPENBSD_BYTESWAP)
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return swap64(x);
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#else
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return ((x & 0xff00000000000000ull) >> 56)
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| ((x & 0x00ff000000000000ull) >> 40)
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| ((x & 0x0000ff0000000000ull) >> 24)
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| ((x & 0x000000ff00000000ull) >> 8)
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| ((x & 0x00000000ff000000ull) << 8)
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| ((x & 0x0000000000ff0000ull) << 24)
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| ((x & 0x000000000000ff00ull) << 40)
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| ((x & 0x00000000000000ffull) << 56);
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#endif
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}
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/*!
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* Returns a formatted string just like standard sprintf(), but makes use of
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* safer functions such as snprintf() if available.
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*/
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inline String formatString(const char *format, ...)
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{
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// Sufficient buffer size for the current internal uses.
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// Consider changing this value when you use this function.
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static const size_t BufferSize = 128;
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va_list args;
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va_start(args, format);
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char buf[BufferSize];
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int length;
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#if defined(HAVE_VSNPRINTF)
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length = vsnprintf(buf, BufferSize, format, args);
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#elif defined(HAVE_VSPRINTF_S)
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length = vsprintf_s(buf, format, args);
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#else
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// The last resort. May cause a buffer overflow.
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length = vsprintf(buf, format, args);
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if(length >= BufferSize) {
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debug("Utils::formatString() - Buffer overflow! Returning an empty string.");
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length = -1;
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}
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#endif
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va_end(args);
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if(length > 0)
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return String(buf);
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else
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return String();
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}
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/*!
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* The types of byte order of the running system.
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*/
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enum ByteOrder
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{
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//! Little endian systems.
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LittleEndian,
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//! Big endian systems.
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BigEndian
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};
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/*!
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* Returns the byte order of the system.
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*/
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inline ByteOrder systemByteOrder()
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{
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union {
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int i;
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char c;
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} u;
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u.i = 1;
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if(u.c == 1)
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return LittleEndian;
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else
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return BigEndian;
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}
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}
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}
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}
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#endif
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#endif
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