diff options
Diffstat (limited to 'intl/icu/source/i18n/uspoof_impl.cpp')
| -rw-r--r-- | intl/icu/source/i18n/uspoof_impl.cpp | 959 |
1 files changed, 959 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/uspoof_impl.cpp b/intl/icu/source/i18n/uspoof_impl.cpp new file mode 100644 index 0000000000..7a6084a109 --- /dev/null +++ b/intl/icu/source/i18n/uspoof_impl.cpp @@ -0,0 +1,959 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +********************************************************************** +* Copyright (C) 2008-2016, International Business Machines +* Corporation and others. All Rights Reserved. +********************************************************************** +*/ + +#include "unicode/utypes.h" +#include "unicode/uspoof.h" +#include "unicode/uchar.h" +#include "unicode/uniset.h" +#include "unicode/utf16.h" +#include "utrie2.h" +#include "cmemory.h" +#include "cstring.h" +#include "scriptset.h" +#include "umutex.h" +#include "udataswp.h" +#include "uassert.h" +#include "ucln_in.h" +#include "uspoof_impl.h" + +#if !UCONFIG_NO_NORMALIZATION + + +U_NAMESPACE_BEGIN + +UOBJECT_DEFINE_RTTI_IMPLEMENTATION(SpoofImpl) + +SpoofImpl::SpoofImpl(SpoofData *data, UErrorCode& status) { + construct(status); + fSpoofData = data; +} + +SpoofImpl::SpoofImpl(UErrorCode& status) { + construct(status); + + // TODO: Call this method where it is actually needed, instead of in the + // constructor, to allow for lazy data loading. See #12696. + fSpoofData = SpoofData::getDefault(status); +} + +SpoofImpl::SpoofImpl() { + UErrorCode status = U_ZERO_ERROR; + construct(status); + + // TODO: Call this method where it is actually needed, instead of in the + // constructor, to allow for lazy data loading. See #12696. + fSpoofData = SpoofData::getDefault(status); +} + +void SpoofImpl::construct(UErrorCode& status) { + fChecks = USPOOF_ALL_CHECKS; + fSpoofData = nullptr; + fAllowedCharsSet = nullptr; + fAllowedLocales = nullptr; + fRestrictionLevel = USPOOF_HIGHLY_RESTRICTIVE; + + if (U_FAILURE(status)) { return; } + + UnicodeSet *allowedCharsSet = new UnicodeSet(0, 0x10ffff); + fAllowedCharsSet = allowedCharsSet; + fAllowedLocales = uprv_strdup(""); + if (fAllowedCharsSet == nullptr || fAllowedLocales == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + return; + } + allowedCharsSet->freeze(); +} + + +// Copy Constructor, used by the user level clone() function. +SpoofImpl::SpoofImpl(const SpoofImpl &src, UErrorCode &status) : + fChecks(USPOOF_ALL_CHECKS), fSpoofData(nullptr), fAllowedCharsSet(nullptr) , + fAllowedLocales(nullptr) { + if (U_FAILURE(status)) { + return; + } + fChecks = src.fChecks; + if (src.fSpoofData != nullptr) { + fSpoofData = src.fSpoofData->addReference(); + } + fAllowedCharsSet = src.fAllowedCharsSet->clone(); + fAllowedLocales = uprv_strdup(src.fAllowedLocales); + if (fAllowedCharsSet == nullptr || fAllowedLocales == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + } + fRestrictionLevel = src.fRestrictionLevel; +} + +SpoofImpl::~SpoofImpl() { + if (fSpoofData != nullptr) { + fSpoofData->removeReference(); // Will delete if refCount goes to zero. + } + delete fAllowedCharsSet; + uprv_free((void *)fAllowedLocales); +} + +// Cast this instance as a USpoofChecker for the C API. +USpoofChecker *SpoofImpl::asUSpoofChecker() { + return exportForC(); +} + +// +// Incoming parameter check on Status and the SpoofChecker object +// received from the C API. +// +const SpoofImpl *SpoofImpl::validateThis(const USpoofChecker *sc, UErrorCode &status) { + auto* This = validate(sc, status); + if (U_FAILURE(status)) { + return nullptr; + } + if (This->fSpoofData != nullptr && !This->fSpoofData->validateDataVersion(status)) { + return nullptr; + } + return This; +} + +SpoofImpl *SpoofImpl::validateThis(USpoofChecker *sc, UErrorCode &status) { + return const_cast<SpoofImpl *> + (SpoofImpl::validateThis(const_cast<const USpoofChecker *>(sc), status)); +} + + +void SpoofImpl::setAllowedLocales(const char *localesList, UErrorCode &status) { + UnicodeSet allowedChars; + UnicodeSet *tmpSet = nullptr; + const char *locStart = localesList; + const char *locEnd = nullptr; + const char *localesListEnd = localesList + uprv_strlen(localesList); + int32_t localeListCount = 0; // Number of locales provided by caller. + + // Loop runs once per locale from the localesList, a comma separated list of locales. + do { + locEnd = uprv_strchr(locStart, ','); + if (locEnd == nullptr) { + locEnd = localesListEnd; + } + while (*locStart == ' ') { + locStart++; + } + const char *trimmedEnd = locEnd-1; + while (trimmedEnd > locStart && *trimmedEnd == ' ') { + trimmedEnd--; + } + if (trimmedEnd <= locStart) { + break; + } + const char *locale = uprv_strndup(locStart, (int32_t)(trimmedEnd + 1 - locStart)); + localeListCount++; + + // We have one locale from the locales list. + // Add the script chars for this locale to the accumulating set of allowed chars. + // If the locale is no good, we will be notified back via status. + addScriptChars(locale, &allowedChars, status); + uprv_free((void *)locale); + if (U_FAILURE(status)) { + break; + } + locStart = locEnd + 1; + } while (locStart < localesListEnd); + + // If our caller provided an empty list of locales, we disable the allowed characters checking + if (localeListCount == 0) { + uprv_free((void *)fAllowedLocales); + fAllowedLocales = uprv_strdup(""); + tmpSet = new UnicodeSet(0, 0x10ffff); + if (fAllowedLocales == nullptr || tmpSet == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + return; + } + tmpSet->freeze(); + delete fAllowedCharsSet; + fAllowedCharsSet = tmpSet; + fChecks &= ~USPOOF_CHAR_LIMIT; + return; + } + + + // Add all common and inherited characters to the set of allowed chars. + UnicodeSet tempSet; + tempSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_COMMON, status); + allowedChars.addAll(tempSet); + tempSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_INHERITED, status); + allowedChars.addAll(tempSet); + + // If anything went wrong, we bail out without changing + // the state of the spoof checker. + if (U_FAILURE(status)) { + return; + } + + // Store the updated spoof checker state. + tmpSet = allowedChars.clone(); + const char *tmpLocalesList = uprv_strdup(localesList); + if (tmpSet == nullptr || tmpLocalesList == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + return; + } + uprv_free((void *)fAllowedLocales); + fAllowedLocales = tmpLocalesList; + tmpSet->freeze(); + delete fAllowedCharsSet; + fAllowedCharsSet = tmpSet; + fChecks |= USPOOF_CHAR_LIMIT; +} + + +const char * SpoofImpl::getAllowedLocales(UErrorCode &/*status*/) { + return fAllowedLocales; +} + + +// Given a locale (a language), add all the characters from all of the scripts used with that language +// to the allowedChars UnicodeSet + +void SpoofImpl::addScriptChars(const char *locale, UnicodeSet *allowedChars, UErrorCode &status) { + UScriptCode scripts[30]; + + int32_t numScripts = uscript_getCode(locale, scripts, UPRV_LENGTHOF(scripts), &status); + if (U_FAILURE(status)) { + return; + } + if (status == U_USING_DEFAULT_WARNING) { + status = U_ILLEGAL_ARGUMENT_ERROR; + return; + } + UnicodeSet tmpSet; + int32_t i; + for (i=0; i<numScripts; i++) { + tmpSet.applyIntPropertyValue(UCHAR_SCRIPT, scripts[i], status); + allowedChars->addAll(tmpSet); + } +} + +// Computes the augmented script set for a code point, according to UTS 39 section 5.1. +void SpoofImpl::getAugmentedScriptSet(UChar32 codePoint, ScriptSet& result, UErrorCode& status) { + result.resetAll(); + result.setScriptExtensions(codePoint, status); + if (U_FAILURE(status)) { return; } + + // Section 5.1 step 1 + if (result.test(USCRIPT_HAN, status)) { + result.set(USCRIPT_HAN_WITH_BOPOMOFO, status); + result.set(USCRIPT_JAPANESE, status); + result.set(USCRIPT_KOREAN, status); + } + if (result.test(USCRIPT_HIRAGANA, status)) { + result.set(USCRIPT_JAPANESE, status); + } + if (result.test(USCRIPT_KATAKANA, status)) { + result.set(USCRIPT_JAPANESE, status); + } + if (result.test(USCRIPT_HANGUL, status)) { + result.set(USCRIPT_KOREAN, status); + } + if (result.test(USCRIPT_BOPOMOFO, status)) { + result.set(USCRIPT_HAN_WITH_BOPOMOFO, status); + } + + // Section 5.1 step 2 + if (result.test(USCRIPT_COMMON, status) || result.test(USCRIPT_INHERITED, status)) { + result.setAll(); + } +} + +// Computes the resolved script set for a string, according to UTS 39 section 5.1. +void SpoofImpl::getResolvedScriptSet(const UnicodeString& input, ScriptSet& result, UErrorCode& status) const { + getResolvedScriptSetWithout(input, USCRIPT_CODE_LIMIT, result, status); +} + +// Computes the resolved script set for a string, omitting characters having the specified script. +// If USCRIPT_CODE_LIMIT is passed as the second argument, all characters are included. +void SpoofImpl::getResolvedScriptSetWithout(const UnicodeString& input, UScriptCode script, ScriptSet& result, UErrorCode& status) const { + result.setAll(); + + ScriptSet temp; + UChar32 codePoint; + for (int32_t i = 0; i < input.length(); i += U16_LENGTH(codePoint)) { + codePoint = input.char32At(i); + + // Compute the augmented script set for the character + getAugmentedScriptSet(codePoint, temp, status); + if (U_FAILURE(status)) { return; } + + // Intersect the augmented script set with the resolved script set, but only if the character doesn't + // have the script specified in the function call + if (script == USCRIPT_CODE_LIMIT || !temp.test(script, status)) { + result.intersect(temp); + } + } +} + +// Computes the set of numerics for a string, according to UTS 39 section 5.3. +void SpoofImpl::getNumerics(const UnicodeString& input, UnicodeSet& result, UErrorCode& /*status*/) const { + result.clear(); + + UChar32 codePoint; + for (int32_t i = 0; i < input.length(); i += U16_LENGTH(codePoint)) { + codePoint = input.char32At(i); + + // Store a representative character for each kind of decimal digit + if (u_charType(codePoint) == U_DECIMAL_DIGIT_NUMBER) { + // Store the zero character as a representative for comparison. + // Unicode guarantees it is codePoint - value + result.add(codePoint - (UChar32)u_getNumericValue(codePoint)); + } + } +} + +// Computes the restriction level of a string, according to UTS 39 section 5.2. +URestrictionLevel SpoofImpl::getRestrictionLevel(const UnicodeString& input, UErrorCode& status) const { + // Section 5.2 step 1: + if (!fAllowedCharsSet->containsAll(input)) { + return USPOOF_UNRESTRICTIVE; + } + + // Section 5.2 step 2 + // Java use a static UnicodeSet for this test. In C++, avoid the static variable + // and just do a simple for loop. + UBool allASCII = true; + for (int32_t i=0, length=input.length(); i<length; i++) { + if (input.charAt(i) > 0x7f) { + allASCII = false; + break; + } + } + if (allASCII) { + return USPOOF_ASCII; + } + + // Section 5.2 steps 3: + ScriptSet resolvedScriptSet; + getResolvedScriptSet(input, resolvedScriptSet, status); + if (U_FAILURE(status)) { return USPOOF_UNRESTRICTIVE; } + + // Section 5.2 step 4: + if (!resolvedScriptSet.isEmpty()) { + return USPOOF_SINGLE_SCRIPT_RESTRICTIVE; + } + + // Section 5.2 step 5: + ScriptSet resolvedNoLatn; + getResolvedScriptSetWithout(input, USCRIPT_LATIN, resolvedNoLatn, status); + if (U_FAILURE(status)) { return USPOOF_UNRESTRICTIVE; } + + // Section 5.2 step 6: + if (resolvedNoLatn.test(USCRIPT_HAN_WITH_BOPOMOFO, status) + || resolvedNoLatn.test(USCRIPT_JAPANESE, status) + || resolvedNoLatn.test(USCRIPT_KOREAN, status)) { + return USPOOF_HIGHLY_RESTRICTIVE; + } + + // Section 5.2 step 7: + if (!resolvedNoLatn.isEmpty() + && !resolvedNoLatn.test(USCRIPT_CYRILLIC, status) + && !resolvedNoLatn.test(USCRIPT_GREEK, status) + && !resolvedNoLatn.test(USCRIPT_CHEROKEE, status)) { + return USPOOF_MODERATELY_RESTRICTIVE; + } + + // Section 5.2 step 8: + return USPOOF_MINIMALLY_RESTRICTIVE; +} + +int32_t SpoofImpl::findHiddenOverlay(const UnicodeString& input, UErrorCode&) const { + bool sawLeadCharacter = false; + for (int32_t i=0; i<input.length();) { + UChar32 cp = input.char32At(i); + if (sawLeadCharacter && cp == 0x0307) { + return i; + } + uint8_t combiningClass = u_getCombiningClass(cp); + // Skip over characters except for those with combining class 0 (non-combining characters) or with + // combining class 230 (same class as U+0307) + U_ASSERT(u_getCombiningClass(0x0307) == 230); + if (combiningClass == 0 || combiningClass == 230) { + sawLeadCharacter = isIllegalCombiningDotLeadCharacter(cp); + } + i += U16_LENGTH(cp); + } + return -1; +} + +static inline bool isIllegalCombiningDotLeadCharacterNoLookup(UChar32 cp) { + return cp == u'i' || cp == u'j' || cp == u'ı' || cp == u'ȷ' || cp == u'l' || + u_hasBinaryProperty(cp, UCHAR_SOFT_DOTTED); +} + +bool SpoofImpl::isIllegalCombiningDotLeadCharacter(UChar32 cp) const { + if (isIllegalCombiningDotLeadCharacterNoLookup(cp)) { + return true; + } + UnicodeString skelStr; + fSpoofData->confusableLookup(cp, skelStr); + UChar32 finalCp = skelStr.char32At(skelStr.moveIndex32(skelStr.length(), -1)); + if (finalCp != cp && isIllegalCombiningDotLeadCharacterNoLookup(finalCp)) { + return true; + } + return false; +} + + + +// Convert a text format hex number. Utility function used by builder code. Static. +// Input: char16_t *string text. Output: a UChar32 +// Input has been pre-checked, and will have no non-hex chars. +// The number must fall in the code point range of 0..0x10ffff +// Static Function. +UChar32 SpoofImpl::ScanHex(const char16_t *s, int32_t start, int32_t limit, UErrorCode &status) { + if (U_FAILURE(status)) { + return 0; + } + U_ASSERT(limit-start > 0); + uint32_t val = 0; + int i; + for (i=start; i<limit; i++) { + int digitVal = s[i] - 0x30; + if (digitVal>9) { + digitVal = 0xa + (s[i] - 0x41); // Upper Case 'A' + } + if (digitVal>15) { + digitVal = 0xa + (s[i] - 0x61); // Lower Case 'a' + } + U_ASSERT(digitVal <= 0xf); + val <<= 4; + val += digitVal; + } + if (val > 0x10ffff) { + status = U_PARSE_ERROR; + val = 0; + } + return (UChar32)val; +} + + +//----------------------------------------- +// +// class CheckResult Implementation +// +//----------------------------------------- + +CheckResult::CheckResult() { + clear(); +} + +USpoofCheckResult* CheckResult::asUSpoofCheckResult() { + return exportForC(); +} + +// +// Incoming parameter check on Status and the CheckResult object +// received from the C API. +// +const CheckResult* CheckResult::validateThis(const USpoofCheckResult *ptr, UErrorCode &status) { + return validate(ptr, status); +} + +CheckResult* CheckResult::validateThis(USpoofCheckResult *ptr, UErrorCode &status) { + return validate(ptr, status); +} + +void CheckResult::clear() { + fChecks = 0; + fNumerics.clear(); + fRestrictionLevel = USPOOF_UNDEFINED_RESTRICTIVE; +} + +int32_t CheckResult::toCombinedBitmask(int32_t enabledChecks) { + if ((enabledChecks & USPOOF_AUX_INFO) != 0 && fRestrictionLevel != USPOOF_UNDEFINED_RESTRICTIVE) { + return fChecks | fRestrictionLevel; + } else { + return fChecks; + } +} + +CheckResult::~CheckResult() { +} + +//---------------------------------------------------------------------------------------------- +// +// class SpoofData Implementation +// +//---------------------------------------------------------------------------------------------- + + +UBool SpoofData::validateDataVersion(UErrorCode &status) const { + if (U_FAILURE(status) || + fRawData == nullptr || + fRawData->fMagic != USPOOF_MAGIC || + fRawData->fFormatVersion[0] != USPOOF_CONFUSABLE_DATA_FORMAT_VERSION || + fRawData->fFormatVersion[1] != 0 || + fRawData->fFormatVersion[2] != 0 || + fRawData->fFormatVersion[3] != 0) { + status = U_INVALID_FORMAT_ERROR; + return false; + } + return true; +} + +static UBool U_CALLCONV +spoofDataIsAcceptable(void *context, + const char * /* type */, const char * /*name*/, + const UDataInfo *pInfo) { + if( + pInfo->size >= 20 && + pInfo->isBigEndian == U_IS_BIG_ENDIAN && + pInfo->charsetFamily == U_CHARSET_FAMILY && + pInfo->dataFormat[0] == 0x43 && // dataFormat="Cfu " + pInfo->dataFormat[1] == 0x66 && + pInfo->dataFormat[2] == 0x75 && + pInfo->dataFormat[3] == 0x20 && + pInfo->formatVersion[0] == USPOOF_CONFUSABLE_DATA_FORMAT_VERSION + ) { + UVersionInfo *version = static_cast<UVersionInfo *>(context); + if(version != nullptr) { + uprv_memcpy(version, pInfo->dataVersion, 4); + } + return true; + } else { + return false; + } +} + +// Methods for the loading of the default confusables data file. The confusable +// data is loaded only when it is needed. +// +// SpoofData::getDefault() - Return the default confusables data, and call the +// initOnce() if it is not available. Adds a reference +// to the SpoofData that the caller is responsible for +// decrementing when they are done with the data. +// +// uspoof_loadDefaultData - Called once, from initOnce(). The resulting SpoofData +// is shared by all spoof checkers using the default data. +// +// uspoof_cleanupDefaultData - Called during cleanup. +// + +static UInitOnce gSpoofInitDefaultOnce {}; +static SpoofData* gDefaultSpoofData; + +static UBool U_CALLCONV +uspoof_cleanupDefaultData() { + if (gDefaultSpoofData) { + // Will delete, assuming all user-level spoof checkers were closed. + gDefaultSpoofData->removeReference(); + gDefaultSpoofData = nullptr; + gSpoofInitDefaultOnce.reset(); + } + return true; +} + +static void U_CALLCONV uspoof_loadDefaultData(UErrorCode& status) { + UDataMemory *udm = udata_openChoice(nullptr, "cfu", "confusables", + spoofDataIsAcceptable, + nullptr, // context, would receive dataVersion if supplied. + &status); + if (U_FAILURE(status)) { return; } + gDefaultSpoofData = new SpoofData(udm, status); + if (U_FAILURE(status)) { + delete gDefaultSpoofData; + gDefaultSpoofData = nullptr; + return; + } + if (gDefaultSpoofData == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + return; + } + ucln_i18n_registerCleanup(UCLN_I18N_SPOOFDATA, uspoof_cleanupDefaultData); +} + +SpoofData* SpoofData::getDefault(UErrorCode& status) { + umtx_initOnce(gSpoofInitDefaultOnce, &uspoof_loadDefaultData, status); + if (U_FAILURE(status)) { return nullptr; } + gDefaultSpoofData->addReference(); + return gDefaultSpoofData; +} + + + +SpoofData::SpoofData(UDataMemory *udm, UErrorCode &status) +{ + reset(); + if (U_FAILURE(status)) { + return; + } + fUDM = udm; + // fRawData is non-const because it may be constructed by the data builder. + fRawData = reinterpret_cast<SpoofDataHeader *>( + const_cast<void *>(udata_getMemory(udm))); + validateDataVersion(status); + initPtrs(status); +} + + +SpoofData::SpoofData(const void *data, int32_t length, UErrorCode &status) +{ + reset(); + if (U_FAILURE(status)) { + return; + } + if ((size_t)length < sizeof(SpoofDataHeader)) { + status = U_INVALID_FORMAT_ERROR; + return; + } + if (data == nullptr) { + status = U_ILLEGAL_ARGUMENT_ERROR; + return; + } + void *ncData = const_cast<void *>(data); + fRawData = static_cast<SpoofDataHeader *>(ncData); + if (length < fRawData->fLength) { + status = U_INVALID_FORMAT_ERROR; + return; + } + validateDataVersion(status); + initPtrs(status); +} + + +// Spoof Data constructor for use from data builder. +// Initializes a new, empty data area that will be populated later. +SpoofData::SpoofData(UErrorCode &status) { + reset(); + if (U_FAILURE(status)) { + return; + } + fDataOwned = true; + + // The spoof header should already be sized to be a multiple of 16 bytes. + // Just in case it's not, round it up. + uint32_t initialSize = (sizeof(SpoofDataHeader) + 15) & ~15; + U_ASSERT(initialSize == sizeof(SpoofDataHeader)); + + fRawData = static_cast<SpoofDataHeader *>(uprv_malloc(initialSize)); + fMemLimit = initialSize; + if (fRawData == nullptr) { + status = U_MEMORY_ALLOCATION_ERROR; + return; + } + uprv_memset(fRawData, 0, initialSize); + + fRawData->fMagic = USPOOF_MAGIC; + fRawData->fFormatVersion[0] = USPOOF_CONFUSABLE_DATA_FORMAT_VERSION; + fRawData->fFormatVersion[1] = 0; + fRawData->fFormatVersion[2] = 0; + fRawData->fFormatVersion[3] = 0; + initPtrs(status); +} + +// reset() - initialize all fields. +// Should be updated if any new fields are added. +// Called by constructors to put things in a known initial state. +void SpoofData::reset() { + fRawData = nullptr; + fDataOwned = false; + fUDM = nullptr; + fMemLimit = 0; + fRefCount = 1; + fCFUKeys = nullptr; + fCFUValues = nullptr; + fCFUStrings = nullptr; +} + + +// SpoofData::initPtrs() +// Initialize the pointers to the various sections of the raw data. +// +// This function is used both during the Trie building process (multiple +// times, as the individual data sections are added), and +// during the opening of a Spoof Checker from prebuilt data. +// +// The pointers for non-existent data sections (identified by an offset of 0) +// are set to nullptr. +// +// Note: During building the data, adding each new data section +// reallocs the raw data area, which likely relocates it, which +// in turn requires reinitializing all of the pointers into it, hence +// multiple calls to this function during building. +// +void SpoofData::initPtrs(UErrorCode &status) { + fCFUKeys = nullptr; + fCFUValues = nullptr; + fCFUStrings = nullptr; + if (U_FAILURE(status)) { + return; + } + if (fRawData->fCFUKeys != 0) { + fCFUKeys = (int32_t *)((char *)fRawData + fRawData->fCFUKeys); + } + if (fRawData->fCFUStringIndex != 0) { + fCFUValues = (uint16_t *)((char *)fRawData + fRawData->fCFUStringIndex); + } + if (fRawData->fCFUStringTable != 0) { + fCFUStrings = (char16_t *)((char *)fRawData + fRawData->fCFUStringTable); + } +} + + +SpoofData::~SpoofData() { + if (fDataOwned) { + uprv_free(fRawData); + } + fRawData = nullptr; + if (fUDM != nullptr) { + udata_close(fUDM); + } + fUDM = nullptr; +} + + +void SpoofData::removeReference() { + if (umtx_atomic_dec(&fRefCount) == 0) { + delete this; + } +} + + +SpoofData *SpoofData::addReference() { + umtx_atomic_inc(&fRefCount); + return this; +} + + +void *SpoofData::reserveSpace(int32_t numBytes, UErrorCode &status) { + if (U_FAILURE(status)) { + return nullptr; + } + if (!fDataOwned) { + UPRV_UNREACHABLE_EXIT; + } + + numBytes = (numBytes + 15) & ~15; // Round up to a multiple of 16 + uint32_t returnOffset = fMemLimit; + fMemLimit += numBytes; + fRawData = static_cast<SpoofDataHeader *>(uprv_realloc(fRawData, fMemLimit)); + fRawData->fLength = fMemLimit; + uprv_memset((char *)fRawData + returnOffset, 0, numBytes); + initPtrs(status); + return (char *)fRawData + returnOffset; +} + +int32_t SpoofData::serialize(void *buf, int32_t capacity, UErrorCode &status) const { + int32_t dataSize = fRawData->fLength; + if (capacity < dataSize) { + status = U_BUFFER_OVERFLOW_ERROR; + return dataSize; + } + uprv_memcpy(buf, fRawData, dataSize); + return dataSize; +} + +int32_t SpoofData::size() const { + return fRawData->fLength; +} + +//------------------------------- +// +// Front-end APIs for SpoofData +// +//------------------------------- + +int32_t SpoofData::confusableLookup(UChar32 inChar, UnicodeString &dest) const { + // Perform a binary search. + // [lo, hi), i.e lo is inclusive, hi is exclusive. + // The result after the loop will be in lo. + int32_t lo = 0; + int32_t hi = length(); + do { + int32_t mid = (lo + hi) / 2; + if (codePointAt(mid) > inChar) { + hi = mid; + } else if (codePointAt(mid) < inChar) { + lo = mid; + } else { + // Found result. Break early. + lo = mid; + break; + } + } while (hi - lo > 1); + + // Did we find an entry? If not, the char maps to itself. + if (codePointAt(lo) != inChar) { + dest.append(inChar); + return 1; + } + + // Add the element to the string builder and return. + return appendValueTo(lo, dest); +} + +int32_t SpoofData::length() const { + return fRawData->fCFUKeysSize; +} + +UChar32 SpoofData::codePointAt(int32_t index) const { + return ConfusableDataUtils::keyToCodePoint(fCFUKeys[index]); +} + +int32_t SpoofData::appendValueTo(int32_t index, UnicodeString& dest) const { + int32_t stringLength = ConfusableDataUtils::keyToLength(fCFUKeys[index]); + + // Value is either a char (for strings of length 1) or + // an index into the string table (for longer strings) + uint16_t value = fCFUValues[index]; + if (stringLength == 1) { + dest.append((char16_t)value); + } else { + dest.append(fCFUStrings + value, stringLength); + } + + return stringLength; +} + + +U_NAMESPACE_END + +U_NAMESPACE_USE + +//----------------------------------------------------------------------------- +// +// uspoof_swap - byte swap and char encoding swap of spoof data +// +//----------------------------------------------------------------------------- +U_CAPI int32_t U_EXPORT2 +uspoof_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData, + UErrorCode *status) { + + if (status == nullptr || U_FAILURE(*status)) { + return 0; + } + if(ds==nullptr || inData==nullptr || length<-1 || (length>0 && outData==nullptr)) { + *status=U_ILLEGAL_ARGUMENT_ERROR; + return 0; + } + + // + // Check that the data header is for spoof data. + // (Header contents are defined in gencfu.cpp) + // + const UDataInfo *pInfo = (const UDataInfo *)((const char *)inData+4); + if(!( pInfo->dataFormat[0]==0x43 && /* dataFormat="Cfu " */ + pInfo->dataFormat[1]==0x66 && + pInfo->dataFormat[2]==0x75 && + pInfo->dataFormat[3]==0x20 && + pInfo->formatVersion[0]==USPOOF_CONFUSABLE_DATA_FORMAT_VERSION && + pInfo->formatVersion[1]==0 && + pInfo->formatVersion[2]==0 && + pInfo->formatVersion[3]==0 )) { + udata_printError(ds, "uspoof_swap(): data format %02x.%02x.%02x.%02x " + "(format version %02x %02x %02x %02x) is not recognized\n", + pInfo->dataFormat[0], pInfo->dataFormat[1], + pInfo->dataFormat[2], pInfo->dataFormat[3], + pInfo->formatVersion[0], pInfo->formatVersion[1], + pInfo->formatVersion[2], pInfo->formatVersion[3]); + *status=U_UNSUPPORTED_ERROR; + return 0; + } + + // + // Swap the data header. (This is the generic ICU Data Header, not the uspoof Specific + // header). This swap also conveniently gets us + // the size of the ICU d.h., which lets us locate the start + // of the uspoof specific data. + // + int32_t headerSize=udata_swapDataHeader(ds, inData, length, outData, status); + + + // + // Get the Spoof Data Header, and check that it appears to be OK. + // + // + const uint8_t *inBytes =(const uint8_t *)inData+headerSize; + SpoofDataHeader *spoofDH = (SpoofDataHeader *)inBytes; + if (ds->readUInt32(spoofDH->fMagic) != USPOOF_MAGIC || + ds->readUInt32(spoofDH->fLength) < sizeof(SpoofDataHeader)) + { + udata_printError(ds, "uspoof_swap(): Spoof Data header is invalid.\n"); + *status=U_UNSUPPORTED_ERROR; + return 0; + } + + // + // Prefight operation? Just return the size + // + int32_t spoofDataLength = ds->readUInt32(spoofDH->fLength); + int32_t totalSize = headerSize + spoofDataLength; + if (length < 0) { + return totalSize; + } + + // + // Check that length passed in is consistent with length from Spoof data header. + // + if (length < totalSize) { + udata_printError(ds, "uspoof_swap(): too few bytes (%d after ICU Data header) for spoof data.\n", + spoofDataLength); + *status=U_INDEX_OUTOFBOUNDS_ERROR; + return 0; + } + + + // + // Swap the Data. Do the data itself first, then the Spoof Data Header, because + // we need to reference the header to locate the data, and an + // inplace swap of the header leaves it unusable. + // + uint8_t *outBytes = (uint8_t *)outData + headerSize; + SpoofDataHeader *outputDH = (SpoofDataHeader *)outBytes; + + int32_t sectionStart; + int32_t sectionLength; + + // + // If not swapping in place, zero out the output buffer before starting. + // Gaps may exist between the individual sections, and these must be zeroed in + // the output buffer. The simplest way to do that is to just zero the whole thing. + // + if (inBytes != outBytes) { + uprv_memset(outBytes, 0, spoofDataLength); + } + + // Confusables Keys Section (fCFUKeys) + sectionStart = ds->readUInt32(spoofDH->fCFUKeys); + sectionLength = ds->readUInt32(spoofDH->fCFUKeysSize) * 4; + ds->swapArray32(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status); + + // String Index Section + sectionStart = ds->readUInt32(spoofDH->fCFUStringIndex); + sectionLength = ds->readUInt32(spoofDH->fCFUStringIndexSize) * 2; + ds->swapArray16(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status); + + // String Table Section + sectionStart = ds->readUInt32(spoofDH->fCFUStringTable); + sectionLength = ds->readUInt32(spoofDH->fCFUStringTableLen) * 2; + ds->swapArray16(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status); + + // And, last, swap the header itself. + // int32_t fMagic // swap this + // uint8_t fFormatVersion[4] // Do not swap this, just copy + // int32_t fLength and all the rest // Swap the rest, all is 32 bit stuff. + // + uint32_t magic = ds->readUInt32(spoofDH->fMagic); + ds->writeUInt32((uint32_t *)&outputDH->fMagic, magic); + + if (inBytes != outBytes) { + uprv_memcpy(outputDH->fFormatVersion, spoofDH->fFormatVersion, sizeof(spoofDH->fFormatVersion)); + } + // swap starting at fLength + ds->swapArray32(ds, &spoofDH->fLength, sizeof(SpoofDataHeader)-8 /* minus magic and fFormatVersion[4] */, &outputDH->fLength, status); + + return totalSize; +} + +#endif + + |