The Tor Browser: intl/icu/source/i18n/uspoof_impl.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/uspoof_impl.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/uspoof_impl.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 **********************************************************************
 *   Copyright (C) 2008-2013, 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 "identifier_info.h"
 #include "scriptset.h"
 #include "udatamem.h"
 #include "umutex.h"
 #include "udataswp.h"
 #include "uassert.h"
 #include "uspoof_impl.h"
 #if !UCONFIG_NO_NORMALIZATION
 U_NAMESPACE_BEGIN
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(SpoofImpl)
 SpoofImpl::SpoofImpl(SpoofData *data, UErrorCode &status) :
         fMagic(0), fChecks(USPOOF_ALL_CHECKS), fSpoofData(NULL), fAllowedCharsSet(NULL) ,
         fAllowedLocales(NULL), fCachedIdentifierInfo(NULL) {
     if (U_FAILURE(status)) {
         return;
     }
     fSpoofData = data;
     fRestrictionLevel = USPOOF_HIGHLY_RESTRICTIVE;
     UnicodeSet *allowedCharsSet = new UnicodeSet(0, 0x10ffff);
     allowedCharsSet->freeze();
     fAllowedCharsSet = allowedCharsSet;
     fAllowedLocales  = uprv_strdup("");
     if (fAllowedCharsSet == NULL || fAllowedLocales == NULL) {
         status = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     fMagic = USPOOF_MAGIC;
 }
 SpoofImpl::SpoofImpl() :
         fMagic(USPOOF_MAGIC), fChecks(USPOOF_ALL_CHECKS), fSpoofData(NULL), fAllowedCharsSet(NULL) ,
         fAllowedLocales(NULL), fCachedIdentifierInfo(NULL) {
     UnicodeSet *allowedCharsSet = new UnicodeSet(0, 0x10ffff);
     allowedCharsSet->freeze();
     fAllowedCharsSet = allowedCharsSet;
     fAllowedLocales  = uprv_strdup("");
     fRestrictionLevel = USPOOF_HIGHLY_RESTRICTIVE;
 }
 // Copy Constructor, used by the user level clone() function.
 SpoofImpl::SpoofImpl(const SpoofImpl &src, UErrorCode &status)  :
         fMagic(0), fChecks(USPOOF_ALL_CHECKS), fSpoofData(NULL), fAllowedCharsSet(NULL) ,
         fAllowedLocales(NULL), fCachedIdentifierInfo(NULL) {
     if (U_FAILURE(status)) {
         return;
     }
     fMagic = src.fMagic;
     fChecks = src.fChecks;
     if (src.fSpoofData != NULL) {
         fSpoofData = src.fSpoofData->addReference();
     }
     fAllowedCharsSet = static_cast<const UnicodeSet *>(src.fAllowedCharsSet->clone());
     if (fAllowedCharsSet == NULL) {
         status = U_MEMORY_ALLOCATION_ERROR;
     }
     fAllowedLocales = uprv_strdup(src.fAllowedLocales);
     fRestrictionLevel = src.fRestrictionLevel;
 }
 SpoofImpl::~SpoofImpl() {
     fMagic = 0;                // head off application errors by preventing use of
                                //    of deleted objects.
     if (fSpoofData != NULL) {
         fSpoofData->removeReference();   // Will delete if refCount goes to zero.
     }
     delete fAllowedCharsSet;
     uprv_free((void *)fAllowedLocales);
     delete fCachedIdentifierInfo;
 }
 //
 //  Incoming parameter check on Status and the SpoofChecker object
 //    received from the C API.
 //
 const SpoofImpl *SpoofImpl::validateThis(const USpoofChecker *sc, UErrorCode &status) {
     if (U_FAILURE(status)) {
         return NULL;
     }
     if (sc == NULL) {
         status = U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     SpoofImpl *This = (SpoofImpl *)sc;
     if (This->fMagic != USPOOF_MAGIC ||
         This->fSpoofData == NULL) {
         status = U_INVALID_FORMAT_ERROR;
         return NULL;
     }
     if (!SpoofData::validateDataVersion(This->fSpoofData->fRawData, status)) {
         return NULL;
     }
     return This;
 }
 SpoofImpl *SpoofImpl::validateThis(USpoofChecker *sc, UErrorCode &status) {
     return const_cast<SpoofImpl *>
         (SpoofImpl::validateThis(const_cast<const USpoofChecker *>(sc), status));
 }
 //--------------------------------------------------------------------------------------
 //
 //  confusableLookup()    This is the heart of the confusable skeleton generation
 //                        implementation.
 //
 //                        Given a source character, produce the corresponding
 //                        replacement character(s), appending them to the dest string.
 //
 //---------------------------------------------------------------------------------------
 int32_t SpoofImpl::confusableLookup(UChar32 inChar, int32_t tableMask, UnicodeString &dest) const {
     // Binary search the spoof data key table for the inChar
     int32_t  *low   = fSpoofData->fCFUKeys;
     int32_t  *mid   = NULL;
     int32_t  *limit = low + fSpoofData->fRawData->fCFUKeysSize;
     UChar32   midc;
     do {
         int32_t delta = ((int32_t)(limit-low))/2;
         mid = low + delta;
         midc = *mid & 0x1fffff;
         if (inChar == midc) {
             goto foundChar;
         } else if (inChar < midc) {
             limit = mid;
         } else {
             low = mid;
         }
     } while (low < limit-1);
     mid = low;
     midc = *mid & 0x1fffff;
     if (inChar != midc) {
         // Char not found.  It maps to itself.
         int i = 0;
         dest.append(inChar);
         return i;
     }
   foundChar:
     int32_t keyFlags = *mid & 0xff000000;
     if ((keyFlags & tableMask) == 0) {
         // We found the right key char, but the entry doesn't pertain to the
         //  table we need.  See if there is an adjacent key that does
         if (keyFlags & USPOOF_KEY_MULTIPLE_VALUES) {
             int32_t *altMid;
             for (altMid = mid-1; (*altMid&0x00ffffff) == inChar; altMid--) {
                 keyFlags = *altMid & 0xff000000;
                 if (keyFlags & tableMask) {
                     mid = altMid;
                     goto foundKey;
                 }
             }
             for (altMid = mid+1; (*altMid&0x00ffffff) == inChar; altMid++) {
                 keyFlags = *altMid & 0xff000000;
                 if (keyFlags & tableMask) {
                     mid = altMid;
                     goto foundKey;
                 }
             }
         }
         // No key entry for this char & table.
         // The input char maps to itself.
         int i = 0;
         dest.append(inChar);
         return i;
     }
   foundKey:
     int32_t  stringLen = USPOOF_KEY_LENGTH_FIELD(keyFlags) + 1;
     int32_t keyTableIndex = (int32_t)(mid - fSpoofData->fCFUKeys);
     // Value is either a UChar  (for strings of length 1) or
     //                 an index into the string table (for longer strings)
     uint16_t value = fSpoofData->fCFUValues[keyTableIndex];
     if (stringLen == 1) {
         dest.append((UChar)value);
         return 1;
     }
     // String length of 4 from the above lookup is used for all strings of length >= 4.
     // For these, get the real length from the string lengths table,
     //   which maps string table indexes to lengths.
     //   All strings of the same length are stored contiguously in the string table.
     //   'value' from the lookup above is the starting index for the desired string.
     int32_t ix;
     if (stringLen == 4) {
         int32_t stringLengthsLimit = fSpoofData->fRawData->fCFUStringLengthsSize;
         for (ix = 0; ix < stringLengthsLimit; ix++) {
             if (fSpoofData->fCFUStringLengths[ix].fLastString >= value) {
                 stringLen = fSpoofData->fCFUStringLengths[ix].fStrLength;
                 break;
             }
         }
         U_ASSERT(ix < stringLengthsLimit);
     }
     U_ASSERT(value + stringLen <= fSpoofData->fRawData->fCFUStringTableLen);
     UChar *src = &fSpoofData->fCFUStrings[value];
     dest.append(src, stringLen);
     return stringLen;
 }
 //---------------------------------------------------------------------------------------
 //
 //  wholeScriptCheck()
 //
 //      Input text is already normalized to NFD
 //      Return the set of scripts, each of which can represent something that is
 //             confusable with the input text.  The script of the input text
 //             is included; input consisting of characters from a single script will
 //             always produce a result consisting of a set containing that script.
 //
 //---------------------------------------------------------------------------------------
 void SpoofImpl::wholeScriptCheck(
         const UnicodeString &text, ScriptSet *result, UErrorCode &status) const {
     UTrie2 *table =
         (fChecks & USPOOF_ANY_CASE) ? fSpoofData->fAnyCaseTrie : fSpoofData->fLowerCaseTrie;
     result->setAll();
     int32_t length = text.length();
     for (int32_t inputIdx=0; inputIdx < length;) {
         UChar32 c = text.char32At(inputIdx);
         inputIdx += U16_LENGTH(c);
         uint32_t index = utrie2_get32(table, c);
         if (index == 0) {
             // No confusables in another script for this char.
             // TODO:  we should change the data to have sets with just the single script
             //        bit for the script of this char.  Gets rid of this special case.
             //        Until then, grab the script from the char and intersect it with the set.
             UScriptCode cpScript = uscript_getScript(c, &status);
             U_ASSERT(cpScript > USCRIPT_INHERITED);
             result->intersect(cpScript, status);
         } else if (index == 1) {
             // Script == Common or Inherited.  Nothing to do.
         } else {
             result->intersect(fSpoofData->fScriptSets[index]);
         }
     }
 }
 void SpoofImpl::setAllowedLocales(const char *localesList, UErrorCode &status) {
     UnicodeSet    allowedChars;
     UnicodeSet    *tmpSet = NULL;
     const char    *locStart = localesList;
     const char    *locEnd = NULL;
     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 == NULL) {
             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 == NULL || tmpSet == NULL) {
             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 = static_cast<UnicodeSet *>(allowedChars.clone());
     const char *tmpLocalesList = uprv_strdup(localesList);
     if (tmpSet == NULL || tmpLocalesList == NULL) {
         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, sizeof(scripts)/sizeof(UScriptCode), &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);
     }
 }
 // Convert a text format hex number.  Utility function used by builder code.  Static.
 // Input: UChar *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 UChar *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;
 }
 // IdentifierInfo Cache. IdentifierInfo objects are somewhat expensive to create.
 //                       Maintain a one-element cache, which is sufficient to avoid repeatedly
 //                       creating new ones unless we get multi-thread concurrency in spoof
 //                       check operations, which should be statistically uncommon.
 // These functions are used in place of new & delete of an IdentifierInfo.
 // They will recycle the IdentifierInfo when possible.
 // They are logically const, and used within const functions that must be thread safe.
 IdentifierInfo *SpoofImpl::getIdentifierInfo(UErrorCode &status) const {
     IdentifierInfo *returnIdInfo = NULL;
     if (U_FAILURE(status)) {
         return returnIdInfo;
     }
     SpoofImpl *nonConstThis = const_cast<SpoofImpl *>(this);
     {
         Mutex m;
         returnIdInfo = nonConstThis->fCachedIdentifierInfo;
         nonConstThis->fCachedIdentifierInfo = NULL;
     }
     if (returnIdInfo == NULL) {
         returnIdInfo = new IdentifierInfo(status);
         if (U_SUCCESS(status) && returnIdInfo == NULL) {
             status = U_MEMORY_ALLOCATION_ERROR;
         }
         if (U_FAILURE(status) && returnIdInfo != NULL) {
             delete returnIdInfo;
             returnIdInfo = NULL;
         }
     }
     return returnIdInfo;
 }
 void SpoofImpl::releaseIdentifierInfo(IdentifierInfo *idInfo) const {
     if (idInfo != NULL) {
         SpoofImpl *nonConstThis = const_cast<SpoofImpl *>(this);
         {
             Mutex m;
             if (nonConstThis->fCachedIdentifierInfo == NULL) {
                 nonConstThis->fCachedIdentifierInfo = idInfo;
                 idInfo = NULL;
             }
         }
         delete idInfo;
     }
 }
 //----------------------------------------------------------------------------------------------
 //
 //   class SpoofData Implementation
 //
 //----------------------------------------------------------------------------------------------
 UBool SpoofData::validateDataVersion(const SpoofDataHeader *rawData, UErrorCode &status) {
     if (U_FAILURE(status) ||
         rawData == NULL ||
         rawData->fMagic != USPOOF_MAGIC ||
         rawData->fFormatVersion[0] > 1 ||
         rawData->fFormatVersion[1] > 0) {
             status = U_INVALID_FORMAT_ERROR;
             return FALSE;
     }
     return TRUE;
 }
 //
 //  SpoofData::getDefault() - return a wrapper around the spoof data that is
 //                           baked into the default ICU data.
 //
 SpoofData *SpoofData::getDefault(UErrorCode &status) {
     // TODO:  Cache it.  Lazy create, keep until cleanup.
     UDataMemory *udm = udata_open(NULL, "cfu", "confusables", &status);
     if (U_FAILURE(status)) {
         return NULL;
     }
     SpoofData *This = new SpoofData(udm, status);
     if (U_FAILURE(status)) {
         delete This;
         return NULL;
     }
     if (This == NULL) {
         status = U_MEMORY_ALLOCATION_ERROR;
     }
     return This;
 }
 SpoofData::SpoofData(UDataMemory *udm, UErrorCode &status)
 {
     reset();
     if (U_FAILURE(status)) {
         return;
     }
     fRawData = reinterpret_cast<SpoofDataHeader *>
                    ((char *)(udm->pHeader) + udm->pHeader->dataHeader.headerSize);
     fUDM = udm;
     validateDataVersion(fRawData, 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;
     }
     void *ncData = const_cast<void *>(data);
     fRawData = static_cast<SpoofDataHeader *>(ncData);
     if (length < fRawData->fLength) {
         status = U_INVALID_FORMAT_ERROR;
         return;
     }
     validateDataVersion(fRawData, 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;
     fRefCount = 1;
     // 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 == NULL) {
         status = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     uprv_memset(fRawData, 0, initialSize);
     fRawData->fMagic = USPOOF_MAGIC;
     fRawData->fFormatVersion[0] = 1;
     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 = NULL;
    fDataOwned = FALSE;
    fUDM      = NULL;
    fMemLimit = 0;
    fRefCount = 1;
    fCFUKeys = NULL;
    fCFUValues = NULL;
    fCFUStringLengths = NULL;
    fCFUStrings = NULL;
    fAnyCaseTrie = NULL;
    fLowerCaseTrie = NULL;
    fScriptSets = NULL;
 }
 //  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 NULL.
 //
 //            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 = NULL;
     fCFUValues = NULL;
     fCFUStringLengths = NULL;
     fCFUStrings = NULL;
     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->fCFUStringLengths != 0) {
         fCFUStringLengths = (SpoofStringLengthsElement *)((char *)fRawData + fRawData->fCFUStringLengths);
     }
     if (fRawData->fCFUStringTable != 0) {
         fCFUStrings = (UChar *)((char *)fRawData + fRawData->fCFUStringTable);
     }
     if (fAnyCaseTrie ==  NULL && fRawData->fAnyCaseTrie != 0) {
         fAnyCaseTrie = utrie2_openFromSerialized(UTRIE2_16_VALUE_BITS,
             (char *)fRawData + fRawData->fAnyCaseTrie, fRawData->fAnyCaseTrieLength, NULL, &status);
     }
     if (fLowerCaseTrie ==  NULL && fRawData->fLowerCaseTrie != 0) {
         fLowerCaseTrie = utrie2_openFromSerialized(UTRIE2_16_VALUE_BITS,
             (char *)fRawData + fRawData->fLowerCaseTrie, fRawData->fLowerCaseTrieLength, NULL, &status);
     }
     if (fRawData->fScriptSets != 0) {
         fScriptSets = (ScriptSet *)((char *)fRawData + fRawData->fScriptSets);
     }
 }
 SpoofData::~SpoofData() {
     utrie2_close(fAnyCaseTrie);
     fAnyCaseTrie = NULL;
     utrie2_close(fLowerCaseTrie);
     fLowerCaseTrie = NULL;
     if (fDataOwned) {
         uprv_free(fRawData);
     }
     fRawData = NULL;
     if (fUDM != NULL) {
         udata_close(fUDM);
     }
     fUDM = NULL;
 }
 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 NULL;
     }
     if (!fDataOwned) {
         U_ASSERT(FALSE);
         status = U_INTERNAL_PROGRAM_ERROR;
         return NULL;
     }
     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;
 }
 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 == NULL || U_FAILURE(*status)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<-1 || (length>0 && outData==NULL)) {
         *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]==1  )) {
         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);
     // String Lengths Section
     sectionStart  = ds->readUInt32(spoofDH->fCFUStringLengths);
     sectionLength = ds->readUInt32(spoofDH->fCFUStringLengthsSize) * 4;
     ds->swapArray16(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
     // Any Case Trie
     sectionStart  = ds->readUInt32(spoofDH->fAnyCaseTrie);
     sectionLength = ds->readUInt32(spoofDH->fAnyCaseTrieLength);
     utrie2_swap(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
     // Lower Case Trie
     sectionStart  = ds->readUInt32(spoofDH->fLowerCaseTrie);
     sectionLength = ds->readUInt32(spoofDH->fLowerCaseTrieLength);
     utrie2_swap(ds, inBytes+sectionStart, sectionLength, outBytes+sectionStart, status);
     // Script Sets.  The data is an array of int32_t
     sectionStart  = ds->readUInt32(spoofDH->fScriptSets);
     sectionLength = ds->readUInt32(spoofDH->fScriptSetsLength) * sizeof(ScriptSet);
     ds->swapArray32(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 (outputDH->fFormatVersion != spoofDH->fFormatVersion) {
         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

The Tor Browser / annotate

intl/icu/source/i18n/uspoof_impl.cpp@fc2d59ddac77 (annotated)

intl/icu/source/i18n/uspoof_impl.cpp