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c193518677
Differential Revision: https://phabricator.services.mozilla.com/D43957 --HG-- extra : moz-landing-system : lando
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Maybe.h"
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#include "mozilla/TextUtils.h"
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#include "mozilla/Types.h"
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#include "mozilla/Utf8.h"
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#include <stddef.h>
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#include <stdint.h>
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MFBT_API bool mozilla::detail::IsValidUtf8(const void* aCodeUnits,
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size_t aCount) {
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const auto* s = reinterpret_cast<const unsigned char*>(aCodeUnits);
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const auto* const limit = s + aCount;
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while (s < limit) {
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unsigned char c = *s++;
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// If the first byte is ASCII, it's the only one in the code point. Have a
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// fast path that avoids all the rest of the work and looping in that case.
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if (IsAscii(c)) {
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continue;
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}
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Maybe<char32_t> maybeCodePoint =
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DecodeOneUtf8CodePoint(Utf8Unit(c), &s, limit);
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if (maybeCodePoint.isNothing()) {
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return false;
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}
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}
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MOZ_ASSERT(s == limit);
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return true;
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}
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