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// Copyright (c) 2019-2022, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <cctype>
#include <cwchar>
#include <stdexcept>
namespace tools
{
template<typename T, typename Transform>
inline T utf8canonical(const T &s, Transform t = [](wint_t c)->wint_t { return c; })
{
T sc = "";
size_t avail = s.size();
const char *ptr = s.data();
wint_t cp = 0;
int bytes = 1;
char wbuf[8], *wptr;
while (avail--)
{
if ((*ptr & 0x80) == 0)
{
cp = *ptr++;
bytes = 1;
}
else if ((*ptr & 0xe0) == 0xc0)
{
if (avail < 1)
throw std::runtime_error("Invalid UTF-8");
cp = (*ptr++ & 0x1f) << 6;
cp |= *ptr++ & 0x3f;
--avail;
bytes = 2;
}
else if ((*ptr & 0xf0) == 0xe0)
{
if (avail < 2)
throw std::runtime_error("Invalid UTF-8");
cp = (*ptr++ & 0xf) << 12;
cp |= (*ptr++ & 0x3f) << 6;
cp |= *ptr++ & 0x3f;
avail -= 2;
bytes = 3;
}
else if ((*ptr & 0xf8) == 0xf0)
{
if (avail < 3)
throw std::runtime_error("Invalid UTF-8");
cp = (*ptr++ & 0x7) << 18;
cp |= (*ptr++ & 0x3f) << 12;
cp |= (*ptr++ & 0x3f) << 6;
cp |= *ptr++ & 0x3f;
avail -= 3;
bytes = 4;
}
else
throw std::runtime_error("Invalid UTF-8");
cp = t(cp);
if (cp <= 0x7f)
bytes = 1;
else if (cp <= 0x7ff)
bytes = 2;
else if (cp <= 0xffff)
bytes = 3;
else if (cp <= 0x10ffff)
bytes = 4;
else
throw std::runtime_error("Invalid code point UTF-8 transformation");
wptr = wbuf;
switch (bytes)
{
case 1: *wptr++ = cp; break;
case 2: *wptr++ = 0xc0 | (cp >> 6); *wptr++ = 0x80 | (cp & 0x3f); break;
case 3: *wptr++ = 0xe0 | (cp >> 12); *wptr++ = 0x80 | ((cp >> 6) & 0x3f); *wptr++ = 0x80 | (cp & 0x3f); break;
case 4: *wptr++ = 0xf0 | (cp >> 18); *wptr++ = 0x80 | ((cp >> 12) & 0x3f); *wptr++ = 0x80 | ((cp >> 6) & 0x3f); *wptr++ = 0x80 | (cp & 0x3f); break;
default: throw std::runtime_error("Invalid UTF-8");
}
*wptr = 0;
sc.append(wbuf, bytes);
cp = 0;
bytes = 1;
}
return sc;
}
}
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