forked from mirrors/gecko-dev
755 lines
26 KiB
C++
755 lines
26 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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#define MOZ_PRETEND_NO_JSRUST 1
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#include "mozilla/Utf8.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/EnumSet.h"
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#include "mozilla/IntegerRange.h"
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#include "mozilla/TextUtils.h"
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using mozilla::ArrayLength;
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using mozilla::AsChars;
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using mozilla::DecodeOneUtf8CodePoint;
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using mozilla::EnumSet;
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using mozilla::IntegerRange;
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using mozilla::IsAscii;
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using mozilla::IsUtf8;
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using mozilla::Span;
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using mozilla::Utf8Unit;
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// Disable the C++ 2a warning. See bug #1509926
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#if defined(__clang__) && (__clang_major__ >= 6)
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wc++2a-compat"
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#endif
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static void TestUtf8Unit() {
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Utf8Unit c('A');
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MOZ_RELEASE_ASSERT(c.toChar() == 'A');
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MOZ_RELEASE_ASSERT(c == Utf8Unit('A'));
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MOZ_RELEASE_ASSERT(c != Utf8Unit('B'));
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MOZ_RELEASE_ASSERT(c.toUint8() == 0x41);
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unsigned char asUnsigned = 'A';
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MOZ_RELEASE_ASSERT(c.toUnsignedChar() == asUnsigned);
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MOZ_RELEASE_ASSERT(Utf8Unit('B').toUnsignedChar() != asUnsigned);
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Utf8Unit first('@');
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Utf8Unit second('#');
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MOZ_RELEASE_ASSERT(first != second);
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first = second;
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MOZ_RELEASE_ASSERT(first == second);
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}
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template <typename Char>
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struct ToUtf8Units {
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public:
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explicit ToUtf8Units(const Char* aStart, const Char* aEnd)
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: lead(Utf8Unit(aStart[0])), iter(aStart + 1), end(aEnd) {
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MOZ_RELEASE_ASSERT(!IsAscii(aStart[0]));
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}
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const Utf8Unit lead;
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const Char* iter;
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const Char* const end;
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};
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class AssertIfCalled {
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public:
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template <typename... Args>
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void operator()(Args&&... aArgs) {
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MOZ_RELEASE_ASSERT(false, "AssertIfCalled instance was called");
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}
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};
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// NOTE: For simplicity in treating |aCharN| identically regardless whether it's
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// a string literal or a more-generalized array, we require |aCharN| be
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// null-terminated.
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template <typename Char, size_t N>
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static void ExpectValidCodePoint(const Char (&aCharN)[N],
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char32_t aExpectedCodePoint) {
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MOZ_RELEASE_ASSERT(aCharN[N - 1] == 0,
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"array must be null-terminated for |aCharN + N - 1| to "
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"compute the value of |aIter| as altered by "
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"DecodeOneUtf8CodePoint");
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ToUtf8Units<Char> simpleUnit(aCharN, aCharN + N - 1);
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auto simple =
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DecodeOneUtf8CodePoint(simpleUnit.lead, &simpleUnit.iter, simpleUnit.end);
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MOZ_RELEASE_ASSERT(simple.isSome());
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MOZ_RELEASE_ASSERT(*simple == aExpectedCodePoint);
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MOZ_RELEASE_ASSERT(simpleUnit.iter == simpleUnit.end);
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ToUtf8Units<Char> complexUnit(aCharN, aCharN + N - 1);
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auto complex = DecodeOneUtf8CodePoint(
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complexUnit.lead, &complexUnit.iter, complexUnit.end, AssertIfCalled(),
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AssertIfCalled(), AssertIfCalled(), AssertIfCalled(), AssertIfCalled());
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MOZ_RELEASE_ASSERT(complex.isSome());
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MOZ_RELEASE_ASSERT(*complex == aExpectedCodePoint);
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MOZ_RELEASE_ASSERT(complexUnit.iter == complexUnit.end);
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}
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enum class InvalidUtf8Reason {
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BadLeadUnit,
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NotEnoughUnits,
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BadTrailingUnit,
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BadCodePoint,
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NotShortestForm,
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};
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template <typename Char, size_t N>
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static void ExpectInvalidCodePointHelper(const Char (&aCharN)[N],
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InvalidUtf8Reason aExpectedReason,
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uint8_t aExpectedUnitsAvailable,
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uint8_t aExpectedUnitsNeeded,
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char32_t aExpectedBadCodePoint,
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uint8_t aExpectedUnitsObserved) {
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MOZ_RELEASE_ASSERT(aCharN[N - 1] == 0,
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"array must be null-terminated for |aCharN + N - 1| to "
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"compute the value of |aIter| as altered by "
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"DecodeOneUtf8CodePoint");
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ToUtf8Units<Char> simpleUnit(aCharN, aCharN + N - 1);
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auto simple =
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DecodeOneUtf8CodePoint(simpleUnit.lead, &simpleUnit.iter, simpleUnit.end);
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MOZ_RELEASE_ASSERT(simple.isNothing());
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MOZ_RELEASE_ASSERT(static_cast<const void*>(simpleUnit.iter) == aCharN);
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EnumSet<InvalidUtf8Reason> reasons;
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uint8_t unitsAvailable;
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uint8_t unitsNeeded;
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char32_t badCodePoint;
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uint8_t unitsObserved;
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struct OnNotShortestForm {
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EnumSet<InvalidUtf8Reason>& reasons;
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char32_t& badCodePoint;
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uint8_t& unitsObserved;
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void operator()(char32_t aBadCodePoint, uint8_t aUnitsObserved) {
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reasons += InvalidUtf8Reason::NotShortestForm;
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badCodePoint = aBadCodePoint;
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unitsObserved = aUnitsObserved;
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}
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};
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ToUtf8Units<Char> complexUnit(aCharN, aCharN + N - 1);
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auto complex = DecodeOneUtf8CodePoint(
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complexUnit.lead, &complexUnit.iter, complexUnit.end,
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[&reasons]() { reasons += InvalidUtf8Reason::BadLeadUnit; },
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[&reasons, &unitsAvailable, &unitsNeeded](uint8_t aUnitsAvailable,
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uint8_t aUnitsNeeded) {
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reasons += InvalidUtf8Reason::NotEnoughUnits;
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unitsAvailable = aUnitsAvailable;
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unitsNeeded = aUnitsNeeded;
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},
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[&reasons, &unitsObserved](uint8_t aUnitsObserved) {
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reasons += InvalidUtf8Reason::BadTrailingUnit;
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unitsObserved = aUnitsObserved;
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},
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[&reasons, &badCodePoint, &unitsObserved](char32_t aBadCodePoint,
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uint8_t aUnitsObserved) {
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reasons += InvalidUtf8Reason::BadCodePoint;
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badCodePoint = aBadCodePoint;
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unitsObserved = aUnitsObserved;
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},
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[&reasons, &badCodePoint, &unitsObserved](char32_t aBadCodePoint,
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uint8_t aUnitsObserved) {
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reasons += InvalidUtf8Reason::NotShortestForm;
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badCodePoint = aBadCodePoint;
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unitsObserved = aUnitsObserved;
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});
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MOZ_RELEASE_ASSERT(complex.isNothing());
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MOZ_RELEASE_ASSERT(static_cast<const void*>(complexUnit.iter) == aCharN);
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bool alreadyIterated = false;
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for (InvalidUtf8Reason reason : reasons) {
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MOZ_RELEASE_ASSERT(!alreadyIterated);
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alreadyIterated = true;
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switch (reason) {
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case InvalidUtf8Reason::BadLeadUnit:
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break;
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case InvalidUtf8Reason::NotEnoughUnits:
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MOZ_RELEASE_ASSERT(unitsAvailable == aExpectedUnitsAvailable);
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MOZ_RELEASE_ASSERT(unitsNeeded == aExpectedUnitsNeeded);
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break;
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case InvalidUtf8Reason::BadTrailingUnit:
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MOZ_RELEASE_ASSERT(unitsObserved == aExpectedUnitsObserved);
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break;
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case InvalidUtf8Reason::BadCodePoint:
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MOZ_RELEASE_ASSERT(badCodePoint == aExpectedBadCodePoint);
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MOZ_RELEASE_ASSERT(unitsObserved == aExpectedUnitsObserved);
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break;
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case InvalidUtf8Reason::NotShortestForm:
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MOZ_RELEASE_ASSERT(badCodePoint == aExpectedBadCodePoint);
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MOZ_RELEASE_ASSERT(unitsObserved == aExpectedUnitsObserved);
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break;
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}
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}
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}
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// NOTE: For simplicity in treating |aCharN| identically regardless whether it's
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// a string literal or a more-generalized array, we require |aCharN| be
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// null-terminated in all these functions.
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template <typename Char, size_t N>
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static void ExpectBadLeadUnit(const Char (&aCharN)[N]) {
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ExpectInvalidCodePointHelper(aCharN, InvalidUtf8Reason::BadLeadUnit, 0xFF,
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0xFF, 0xFFFFFFFF, 0xFF);
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}
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template <typename Char, size_t N>
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static void ExpectNotEnoughUnits(const Char (&aCharN)[N],
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uint8_t aExpectedUnitsAvailable,
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uint8_t aExpectedUnitsNeeded) {
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ExpectInvalidCodePointHelper(aCharN, InvalidUtf8Reason::NotEnoughUnits,
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aExpectedUnitsAvailable, aExpectedUnitsNeeded,
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0xFFFFFFFF, 0xFF);
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}
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template <typename Char, size_t N>
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static void ExpectBadTrailingUnit(const Char (&aCharN)[N],
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uint8_t aExpectedUnitsObserved) {
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ExpectInvalidCodePointHelper(aCharN, InvalidUtf8Reason::BadTrailingUnit, 0xFF,
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0xFF, 0xFFFFFFFF, aExpectedUnitsObserved);
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}
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template <typename Char, size_t N>
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static void ExpectNotShortestForm(const Char (&aCharN)[N],
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char32_t aExpectedBadCodePoint,
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uint8_t aExpectedUnitsObserved) {
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ExpectInvalidCodePointHelper(aCharN, InvalidUtf8Reason::NotShortestForm, 0xFF,
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0xFF, aExpectedBadCodePoint,
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aExpectedUnitsObserved);
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}
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template <typename Char, size_t N>
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static void ExpectBadCodePoint(const Char (&aCharN)[N],
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char32_t aExpectedBadCodePoint,
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uint8_t aExpectedUnitsObserved) {
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ExpectInvalidCodePointHelper(aCharN, InvalidUtf8Reason::BadCodePoint, 0xFF,
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0xFF, aExpectedBadCodePoint,
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aExpectedUnitsObserved);
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}
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static void TestIsUtf8() {
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// Note we include the U+0000 NULL in this one -- and that's fine.
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static const char asciiBytes[] = u8"How about a nice game of chess?";
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MOZ_RELEASE_ASSERT(IsUtf8(Span(asciiBytes, ArrayLength(asciiBytes))));
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static const char endNonAsciiBytes[] = u8"Life is like a 🌯";
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MOZ_RELEASE_ASSERT(
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IsUtf8(Span(endNonAsciiBytes, ArrayLength(endNonAsciiBytes) - 1)));
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static const unsigned char badLeading[] = {0x80};
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MOZ_RELEASE_ASSERT(
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!IsUtf8(AsChars(Span(badLeading, ArrayLength(badLeading)))));
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// Byte-counts
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// 1
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static const char oneBytes[] = u8"A"; // U+0041 LATIN CAPITAL LETTER A
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constexpr size_t oneBytesLen = ArrayLength(oneBytes);
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static_assert(oneBytesLen == 2, "U+0041 plus nul");
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MOZ_RELEASE_ASSERT(IsUtf8(Span(oneBytes, oneBytesLen)));
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// 2
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static const char twoBytes[] = u8"؆"; // U+0606 ARABIC-INDIC CUBE ROOT
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constexpr size_t twoBytesLen = ArrayLength(twoBytes);
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static_assert(twoBytesLen == 3, "U+0606 in two bytes plus nul");
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MOZ_RELEASE_ASSERT(IsUtf8(Span(twoBytes, twoBytesLen)));
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ExpectValidCodePoint(twoBytes, 0x0606);
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// 3
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static const char threeBytes[] = u8"᨞"; // U+1A1E BUGINESE PALLAWA
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constexpr size_t threeBytesLen = ArrayLength(threeBytes);
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static_assert(threeBytesLen == 4, "U+1A1E in three bytes plus nul");
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MOZ_RELEASE_ASSERT(IsUtf8(Span(threeBytes, threeBytesLen)));
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ExpectValidCodePoint(threeBytes, 0x1A1E);
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// 4
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static const char fourBytes[] =
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u8"🁡"; // U+1F061 DOMINO TILE HORIZONTAL-06-06
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constexpr size_t fourBytesLen = ArrayLength(fourBytes);
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static_assert(fourBytesLen == 5, "U+1F061 in four bytes plus nul");
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MOZ_RELEASE_ASSERT(IsUtf8(Span(fourBytes, fourBytesLen)));
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ExpectValidCodePoint(fourBytes, 0x1F061);
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// Max code point
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static const char maxCodePoint[] = u8""; // U+10FFFF
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constexpr size_t maxCodePointLen = ArrayLength(maxCodePoint);
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static_assert(maxCodePointLen == 5, "U+10FFFF in four bytes plus nul");
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MOZ_RELEASE_ASSERT(IsUtf8(Span(maxCodePoint, maxCodePointLen)));
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ExpectValidCodePoint(maxCodePoint, 0x10FFFF);
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// One past max code point
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static const unsigned char onePastMaxCodePoint[] = {0xF4, 0x90, 0x80, 0x80,
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0x0};
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constexpr size_t onePastMaxCodePointLen = ArrayLength(onePastMaxCodePoint);
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MOZ_RELEASE_ASSERT(
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!IsUtf8(AsChars(Span(onePastMaxCodePoint, onePastMaxCodePointLen))));
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ExpectBadCodePoint(onePastMaxCodePoint, 0x110000, 4);
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// Surrogate-related testing
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// (Note that the various code unit sequences here are null-terminated to
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// simplify life for ExpectValidCodePoint, which presumes null termination.)
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static const unsigned char justBeforeSurrogates[] = {0xED, 0x9F, 0xBF, 0x0};
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constexpr size_t justBeforeSurrogatesLen =
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ArrayLength(justBeforeSurrogates) - 1;
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MOZ_RELEASE_ASSERT(
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IsUtf8(AsChars(Span(justBeforeSurrogates, justBeforeSurrogatesLen))));
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ExpectValidCodePoint(justBeforeSurrogates, 0xD7FF);
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static const unsigned char leastSurrogate[] = {0xED, 0xA0, 0x80, 0x0};
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constexpr size_t leastSurrogateLen = ArrayLength(leastSurrogate) - 1;
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MOZ_RELEASE_ASSERT(!IsUtf8(AsChars(Span(leastSurrogate, leastSurrogateLen))));
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ExpectBadCodePoint(leastSurrogate, 0xD800, 3);
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static const unsigned char arbitraryHighSurrogate[] = {0xED, 0xA2, 0x87, 0x0};
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constexpr size_t arbitraryHighSurrogateLen =
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ArrayLength(arbitraryHighSurrogate) - 1;
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MOZ_RELEASE_ASSERT(!IsUtf8(
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AsChars(Span(arbitraryHighSurrogate, arbitraryHighSurrogateLen))));
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ExpectBadCodePoint(arbitraryHighSurrogate, 0xD887, 3);
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static const unsigned char arbitraryLowSurrogate[] = {0xED, 0xB7, 0xAF, 0x0};
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constexpr size_t arbitraryLowSurrogateLen =
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ArrayLength(arbitraryLowSurrogate) - 1;
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MOZ_RELEASE_ASSERT(
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!IsUtf8(AsChars(Span(arbitraryLowSurrogate, arbitraryLowSurrogateLen))));
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ExpectBadCodePoint(arbitraryLowSurrogate, 0xDDEF, 3);
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static const unsigned char greatestSurrogate[] = {0xED, 0xBF, 0xBF, 0x0};
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constexpr size_t greatestSurrogateLen = ArrayLength(greatestSurrogate) - 1;
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MOZ_RELEASE_ASSERT(
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!IsUtf8(AsChars(Span(greatestSurrogate, greatestSurrogateLen))));
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ExpectBadCodePoint(greatestSurrogate, 0xDFFF, 3);
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static const unsigned char justAfterSurrogates[] = {0xEE, 0x80, 0x80, 0x0};
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constexpr size_t justAfterSurrogatesLen =
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ArrayLength(justAfterSurrogates) - 1;
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MOZ_RELEASE_ASSERT(
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IsUtf8(AsChars(Span(justAfterSurrogates, justAfterSurrogatesLen))));
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ExpectValidCodePoint(justAfterSurrogates, 0xE000);
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}
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static void TestDecodeOneValidUtf8CodePoint() {
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// NOTE: DecodeOneUtf8CodePoint decodes only *non*-ASCII code points that
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// consist of multiple code units, so there are no ASCII tests below.
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// Length two.
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ExpectValidCodePoint(u8"", 0x80); // <control>
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ExpectValidCodePoint(u8"©", 0xA9); // COPYRIGHT SIGN
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ExpectValidCodePoint(u8"¶", 0xB6); // PILCROW SIGN
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ExpectValidCodePoint(u8"¾", 0xBE); // VULGAR FRACTION THREE QUARTERS
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ExpectValidCodePoint(u8"÷", 0xF7); // DIVISION SIGN
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ExpectValidCodePoint(u8"ÿ", 0xFF); // LATIN SMALL LETTER Y WITH DIAERESIS
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ExpectValidCodePoint(u8"Ā", 0x100); // LATIN CAPITAL LETTER A WITH MACRON
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ExpectValidCodePoint(u8"IJ", 0x132); // LATIN CAPITAL LETTER LIGATURE IJ
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ExpectValidCodePoint(u8"ͼ", 0x37C); // GREEK SMALL DOTTED LUNATE SIGMA SYMBOL
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ExpectValidCodePoint(u8"Ӝ",
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0x4DC); // CYRILLIC CAPITAL LETTER ZHE WITTH DIAERESIS
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ExpectValidCodePoint(u8"۩", 0x6E9); // ARABIC PLACE OF SAJDAH
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ExpectValidCodePoint(u8"߿", 0x7FF); // <not assigned>
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// Length three.
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ExpectValidCodePoint(u8"ࠀ", 0x800); // SAMARITAN LETTER ALAF
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ExpectValidCodePoint(u8"ࡁ", 0x841); // MANDAIC LETTER AB
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ExpectValidCodePoint(u8"ࣿ", 0x8FF); // ARABIC MARK SIDEWAYS NOON GHUNNA
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ExpectValidCodePoint(u8"ஆ", 0xB86); // TAMIL LETTER AA
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ExpectValidCodePoint(u8"༃",
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0xF03); // TIBETAN MARK GTER YIG MGO -UM GTER TSHEG MA
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ExpectValidCodePoint(
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u8"࿉",
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0xFC9); // TIBETAN SYMBOL NOR BU (but on my system it really looks like
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// SOFT-SERVE ICE CREAM FROM ABOVE THE PLANE if you ask me)
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ExpectValidCodePoint(u8"ဪ", 0x102A); // MYANMAR LETTER AU
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ExpectValidCodePoint(u8"ᚏ", 0x168F); // OGHAM LETTER RUIS
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ExpectValidCodePoint("\xE2\x80\xA8", 0x2028); // (the hated) LINE SEPARATOR
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ExpectValidCodePoint("\xE2\x80\xA9",
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0x2029); // (the hated) PARAGRAPH SEPARATOR
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ExpectValidCodePoint(u8"☬", 0x262C); // ADI SHAKTI
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ExpectValidCodePoint(u8"㊮", 0x32AE); // CIRCLED IDEOGRAPH RESOURCE
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ExpectValidCodePoint(u8"㏖", 0x33D6); // SQUARE MOL
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ExpectValidCodePoint(u8"ꔄ", 0xA504); // VAI SYLLABLE WEEN
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ExpectValidCodePoint(u8"ퟕ", 0xD7D5); // HANGUL JONGSEONG RIEUL-SSANGKIYEOK
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ExpectValidCodePoint(u8"", 0xD7FF); // <not assigned>
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ExpectValidCodePoint(u8"", 0xE000); // <Private Use>
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ExpectValidCodePoint(u8"鱗", 0xF9F2); // CJK COMPATIBILITY IDEOGRAPH-F9F
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ExpectValidCodePoint(
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u8"﷽", 0xFDFD); // ARABIC LIGATURE BISMILLAH AR-RAHMAN AR-RAHHHEEEEM
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ExpectValidCodePoint(u8"", 0xFFFF); // <not assigned>
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// Length four.
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ExpectValidCodePoint(u8"𐀀", 0x10000); // LINEAR B SYLLABLE B008 A
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ExpectValidCodePoint(u8"𔑀", 0x14440); // ANATOLIAN HIEROGLYPH A058
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ExpectValidCodePoint(u8"𝛗", 0x1D6D7); // MATHEMATICAL BOLD SMALL PHI
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ExpectValidCodePoint(u8"💩", 0x1F4A9); // PILE OF POO
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ExpectValidCodePoint(u8"🔫", 0x1F52B); // PISTOL
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ExpectValidCodePoint(u8"🥌", 0x1F94C); // CURLING STONE
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ExpectValidCodePoint(u8"🥏", 0x1F94F); // FLYING DISC
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||
ExpectValidCodePoint(u8"𠍆", 0x20346); // CJK UNIFIED IDEOGRAPH-20346
|
||
ExpectValidCodePoint(u8"𡠺", 0x2183A); // CJK UNIFIED IDEOGRAPH-2183A
|
||
ExpectValidCodePoint(u8"", 0x417F6); // <not assigned>
|
||
ExpectValidCodePoint(u8"", 0x7E836); // <not assigned>
|
||
ExpectValidCodePoint(u8"", 0xFEF67); // <Plane 15 Private Use>
|
||
ExpectValidCodePoint(u8"", 0x10FFFF); //
|
||
}
|
||
|
||
static void TestDecodeBadLeadUnit() {
|
||
// These tests are actually exhaustive.
|
||
|
||
unsigned char badLead[] = {'\0', '\0'};
|
||
|
||
for (uint8_t lead : IntegerRange(0b1000'0000, 0b1100'0000)) {
|
||
badLead[0] = lead;
|
||
ExpectBadLeadUnit(badLead);
|
||
}
|
||
|
||
{
|
||
uint8_t lead = 0b1111'1000;
|
||
do {
|
||
badLead[0] = lead;
|
||
ExpectBadLeadUnit(badLead);
|
||
if (lead == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
lead++;
|
||
} while (true);
|
||
}
|
||
}
|
||
|
||
static void TestTooFewOrBadTrailingUnits() {
|
||
// Lead unit indicates a two-byte code point.
|
||
|
||
char truncatedTwo[] = {'\0', '\0'};
|
||
char badTrailTwo[] = {'\0', '\0', '\0'};
|
||
|
||
for (uint8_t lead : IntegerRange(0b1100'0000, 0b1110'0000)) {
|
||
truncatedTwo[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedTwo, 1, 2);
|
||
|
||
badTrailTwo[0] = lead;
|
||
for (uint8_t trail : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailTwo[1] = trail;
|
||
ExpectBadTrailingUnit(badTrailTwo, 2);
|
||
}
|
||
|
||
for (uint8_t trail : IntegerRange(0b1100'0000, 0b1111'1111)) {
|
||
badTrailTwo[1] = trail;
|
||
ExpectBadTrailingUnit(badTrailTwo, 2);
|
||
}
|
||
}
|
||
|
||
// Lead unit indicates a three-byte code point.
|
||
|
||
char truncatedThreeOne[] = {'\0', '\0'};
|
||
char truncatedThreeTwo[] = {'\0', '\0', '\0'};
|
||
unsigned char badTrailThree[] = {'\0', '\0', '\0', '\0'};
|
||
|
||
for (uint8_t lead : IntegerRange(0b1110'0000, 0b1111'0000)) {
|
||
truncatedThreeOne[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedThreeOne, 1, 3);
|
||
|
||
truncatedThreeTwo[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedThreeTwo, 2, 3);
|
||
|
||
badTrailThree[0] = lead;
|
||
badTrailThree[2] = 0b1011'1111; // make valid to test overreads
|
||
for (uint8_t mid : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailThree[1] = mid;
|
||
ExpectBadTrailingUnit(badTrailThree, 2);
|
||
}
|
||
{
|
||
uint8_t mid = 0b1100'0000;
|
||
do {
|
||
badTrailThree[1] = mid;
|
||
ExpectBadTrailingUnit(badTrailThree, 2);
|
||
if (mid == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
mid++;
|
||
} while (true);
|
||
}
|
||
|
||
badTrailThree[1] = 0b1011'1111;
|
||
for (uint8_t last : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailThree[2] = last;
|
||
ExpectBadTrailingUnit(badTrailThree, 3);
|
||
}
|
||
{
|
||
uint8_t last = 0b1100'0000;
|
||
do {
|
||
badTrailThree[2] = last;
|
||
ExpectBadTrailingUnit(badTrailThree, 3);
|
||
if (last == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
last++;
|
||
} while (true);
|
||
}
|
||
}
|
||
|
||
// Lead unit indicates a four-byte code point.
|
||
|
||
char truncatedFourOne[] = {'\0', '\0'};
|
||
char truncatedFourTwo[] = {'\0', '\0', '\0'};
|
||
char truncatedFourThree[] = {'\0', '\0', '\0', '\0'};
|
||
|
||
unsigned char badTrailFour[] = {'\0', '\0', '\0', '\0', '\0'};
|
||
|
||
for (uint8_t lead : IntegerRange(0b1111'0000, 0b1111'1000)) {
|
||
truncatedFourOne[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedFourOne, 1, 4);
|
||
|
||
truncatedFourTwo[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedFourTwo, 2, 4);
|
||
|
||
truncatedFourThree[0] = lead;
|
||
ExpectNotEnoughUnits(truncatedFourThree, 3, 4);
|
||
|
||
badTrailFour[0] = lead;
|
||
badTrailFour[2] = badTrailFour[3] = 0b1011'1111; // test for overreads
|
||
for (uint8_t second : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailFour[1] = second;
|
||
ExpectBadTrailingUnit(badTrailFour, 2);
|
||
}
|
||
{
|
||
uint8_t second = 0b1100'0000;
|
||
do {
|
||
badTrailFour[1] = second;
|
||
ExpectBadTrailingUnit(badTrailFour, 2);
|
||
if (second == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
second++;
|
||
} while (true);
|
||
}
|
||
|
||
badTrailFour[1] = badTrailFour[3] = 0b1011'1111; // test for overreads
|
||
for (uint8_t third : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailFour[2] = third;
|
||
ExpectBadTrailingUnit(badTrailFour, 3);
|
||
}
|
||
{
|
||
uint8_t third = 0b1100'0000;
|
||
do {
|
||
badTrailFour[2] = third;
|
||
ExpectBadTrailingUnit(badTrailFour, 3);
|
||
if (third == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
third++;
|
||
} while (true);
|
||
}
|
||
|
||
badTrailFour[2] = 0b1011'1111;
|
||
for (uint8_t fourth : IntegerRange(0b0000'0000, 0b1000'0000)) {
|
||
badTrailFour[3] = fourth;
|
||
ExpectBadTrailingUnit(badTrailFour, 4);
|
||
}
|
||
{
|
||
uint8_t fourth = 0b1100'0000;
|
||
do {
|
||
badTrailFour[3] = fourth;
|
||
ExpectBadTrailingUnit(badTrailFour, 4);
|
||
if (fourth == 0b1111'1111) {
|
||
break;
|
||
}
|
||
|
||
fourth++;
|
||
} while (true);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void TestBadSurrogate() {
|
||
// These tests are actually exhaustive.
|
||
|
||
ExpectValidCodePoint("\xED\x9F\xBF", 0xD7FF); // last before surrogates
|
||
ExpectValidCodePoint("\xEE\x80\x80", 0xE000); // first after surrogates
|
||
|
||
// First invalid surrogate encoding is { 0xED, 0xA0, 0x80 }. Last invalid
|
||
// surrogate encoding is { 0xED, 0xBF, 0xBF }.
|
||
|
||
char badSurrogate[] = {'\xED', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = 0xD800; c < 0xE000; c++) {
|
||
badSurrogate[1] = 0b1000'0000 ^ ((c & 0b1111'1100'0000) >> 6);
|
||
badSurrogate[2] = 0b1000'0000 ^ ((c & 0b0000'0011'1111));
|
||
|
||
ExpectBadCodePoint(badSurrogate, c, 3);
|
||
}
|
||
}
|
||
|
||
static void TestBadTooBig() {
|
||
// These tests are actually exhaustive.
|
||
|
||
ExpectValidCodePoint("\xF4\x8F\xBF\xBF", 0x10'FFFF); // last code point
|
||
|
||
// Four-byte code points are
|
||
//
|
||
// 0b1111'0xxx 0b10xx'xxxx 0b10xx'xxxx 0b10xx'xxxx
|
||
//
|
||
// with 3 + 6 + 6 + 6 == 21 unconstrained bytes, so the structurally
|
||
// representable limit (exclusive) is 2**21 - 1 == 2097152.
|
||
|
||
char tooLargeCodePoint[] = {'\0', '\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = 0x11'0000; c < (1 << 21); c++) {
|
||
tooLargeCodePoint[0] =
|
||
0b1111'0000 ^ ((c & 0b1'1100'0000'0000'0000'0000) >> 18);
|
||
tooLargeCodePoint[1] =
|
||
0b1000'0000 ^ ((c & 0b0'0011'1111'0000'0000'0000) >> 12);
|
||
tooLargeCodePoint[2] =
|
||
0b1000'0000 ^ ((c & 0b0'0000'0000'1111'1100'0000) >> 6);
|
||
tooLargeCodePoint[3] = 0b1000'0000 ^ ((c & 0b0'0000'0000'0000'0011'1111));
|
||
|
||
ExpectBadCodePoint(tooLargeCodePoint, c, 4);
|
||
}
|
||
}
|
||
|
||
static void TestBadCodePoint() {
|
||
TestBadSurrogate();
|
||
TestBadTooBig();
|
||
}
|
||
|
||
static void TestNotShortestForm() {
|
||
{
|
||
// One-byte in two-byte.
|
||
|
||
char oneInTwo[] = {'\0', '\0', '\0'};
|
||
|
||
for (char32_t c = '\0'; c < 0x80; c++) {
|
||
oneInTwo[0] = 0b1100'0000 ^ ((c & 0b0111'1100'0000) >> 6);
|
||
oneInTwo[1] = 0b1000'0000 ^ ((c & 0b0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(oneInTwo, c, 2);
|
||
}
|
||
|
||
// One-byte in three-byte.
|
||
|
||
char oneInThree[] = {'\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = '\0'; c < 0x80; c++) {
|
||
oneInThree[0] = 0b1110'0000 ^ ((c & 0b1111'0000'0000'0000) >> 12);
|
||
oneInThree[1] = 0b1000'0000 ^ ((c & 0b0000'1111'1100'0000) >> 6);
|
||
oneInThree[2] = 0b1000'0000 ^ ((c & 0b0000'0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(oneInThree, c, 3);
|
||
}
|
||
|
||
// One-byte in four-byte.
|
||
|
||
char oneInFour[] = {'\0', '\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = '\0'; c < 0x80; c++) {
|
||
oneInFour[0] = 0b1111'0000 ^ ((c & 0b1'1100'0000'0000'0000'0000) >> 18);
|
||
oneInFour[1] = 0b1000'0000 ^ ((c & 0b0'0011'1111'0000'0000'0000) >> 12);
|
||
oneInFour[2] = 0b1000'0000 ^ ((c & 0b0'0000'0000'1111'1100'0000) >> 6);
|
||
oneInFour[3] = 0b1000'0000 ^ ((c & 0b0'0000'0000'0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(oneInFour, c, 4);
|
||
}
|
||
}
|
||
|
||
{
|
||
// Two-byte in three-byte.
|
||
|
||
char twoInThree[] = {'\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = 0x80; c < 0x800; c++) {
|
||
twoInThree[0] = 0b1110'0000 ^ ((c & 0b1111'0000'0000'0000) >> 12);
|
||
twoInThree[1] = 0b1000'0000 ^ ((c & 0b0000'1111'1100'0000) >> 6);
|
||
twoInThree[2] = 0b1000'0000 ^ ((c & 0b0000'0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(twoInThree, c, 3);
|
||
}
|
||
|
||
// Two-byte in four-byte.
|
||
|
||
char twoInFour[] = {'\0', '\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = 0x80; c < 0x800; c++) {
|
||
twoInFour[0] = 0b1111'0000 ^ ((c & 0b1'1100'0000'0000'0000'0000) >> 18);
|
||
twoInFour[1] = 0b1000'0000 ^ ((c & 0b0'0011'1111'0000'0000'0000) >> 12);
|
||
twoInFour[2] = 0b1000'0000 ^ ((c & 0b0'0000'0000'1111'1100'0000) >> 6);
|
||
twoInFour[3] = 0b1000'0000 ^ ((c & 0b0'0000'0000'0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(twoInFour, c, 4);
|
||
}
|
||
}
|
||
|
||
{
|
||
// Three-byte in four-byte.
|
||
|
||
char threeInFour[] = {'\0', '\0', '\0', '\0', '\0'};
|
||
|
||
for (char32_t c = 0x800; c < 0x1'0000; c++) {
|
||
threeInFour[0] = 0b1111'0000 ^ ((c & 0b1'1100'0000'0000'0000'0000) >> 18);
|
||
threeInFour[1] = 0b1000'0000 ^ ((c & 0b0'0011'1111'0000'0000'0000) >> 12);
|
||
threeInFour[2] = 0b1000'0000 ^ ((c & 0b0'0000'0000'1111'1100'0000) >> 6);
|
||
threeInFour[3] = 0b1000'0000 ^ ((c & 0b0'0000'0000'0000'0011'1111));
|
||
|
||
ExpectNotShortestForm(threeInFour, c, 4);
|
||
}
|
||
}
|
||
}
|
||
|
||
static void TestDecodeOneInvalidUtf8CodePoint() {
|
||
TestDecodeBadLeadUnit();
|
||
TestTooFewOrBadTrailingUnits();
|
||
TestBadCodePoint();
|
||
TestNotShortestForm();
|
||
}
|
||
|
||
static void TestDecodeOneUtf8CodePoint() {
|
||
TestDecodeOneValidUtf8CodePoint();
|
||
TestDecodeOneInvalidUtf8CodePoint();
|
||
}
|
||
|
||
int main() {
|
||
TestUtf8Unit();
|
||
TestIsUtf8();
|
||
TestDecodeOneUtf8CodePoint();
|
||
return 0;
|
||
}
|
||
|
||
#if defined(__clang__) && (__clang_major__ >= 6)
|
||
# pragma clang diagnostic pop
|
||
#endif
|