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