mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-14 10:43:24 +00:00
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 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "mozilla/Maybe.h"
|
|
#include "mozilla/TextUtils.h"
|
|
#include "mozilla/Types.h"
|
|
#include "mozilla/Utf8.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
MFBT_API bool mozilla::detail::IsValidUtf8(const void* aCodeUnits,
|
|
size_t aCount) {
|
|
const auto* s = reinterpret_cast<const unsigned char*>(aCodeUnits);
|
|
const auto* const limit = s + aCount;
|
|
|
|
while (s < limit) {
|
|
unsigned char c = *s++;
|
|
|
|
// If the first byte is ASCII, it's the only one in the code point. Have a
|
|
// fast path that avoids all the rest of the work and looping in that case.
|
|
if (IsAscii(c)) {
|
|
continue;
|
|
}
|
|
|
|
Maybe<char32_t> maybeCodePoint =
|
|
DecodeOneUtf8CodePoint(Utf8Unit(c), &s, limit);
|
|
if (maybeCodePoint.isNothing()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(s == limit);
|
|
return true;
|
|
}
|