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Diffstat (limited to 'intl/icu/source/i18n/uspoof_impl.h')
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1 files changed, 343 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/uspoof_impl.h b/intl/icu/source/i18n/uspoof_impl.h new file mode 100644 index 0000000000..b111d4b16a --- /dev/null +++ b/intl/icu/source/i18n/uspoof_impl.h @@ -0,0 +1,343 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +*************************************************************************** +* Copyright (C) 2008-2013, International Business Machines Corporation +* and others. All Rights Reserved. +*************************************************************************** +* +* uspoof_impl.h +* +* Implemenation header for spoof detection +* +*/ + +#ifndef USPOOFIM_H +#define USPOOFIM_H + +#include "uassert.h" +#include "unicode/utypes.h" +#include "unicode/uspoof.h" +#include "unicode/uscript.h" +#include "unicode/udata.h" +#include "udataswp.h" +#include "utrie2.h" + +#if !UCONFIG_NO_NORMALIZATION + +#ifdef __cplusplus + +#include "capi_helper.h" + +U_NAMESPACE_BEGIN + +// The maximium length (in UTF-16 UChars) of the skeleton replacement string resulting from +// a single input code point. This is function of the unicode.org data. +#define USPOOF_MAX_SKELETON_EXPANSION 20 + +// The default stack buffer size for copies or conversions or normalizations +// of input strings being checked. (Used in multiple places.) +#define USPOOF_STACK_BUFFER_SIZE 100 + +// Magic number for sanity checking spoof data. +#define USPOOF_MAGIC 0x3845fdef + +// Magic number for sanity checking spoof checkers. +#define USPOOF_CHECK_MAGIC 0x2734ecde + +class ScriptSet; +class SpoofData; +struct SpoofDataHeader; +class ConfusableDataUtils; + +/** + * Class SpoofImpl corresponds directly to the plain C API opaque type + * USpoofChecker. One can be cast to the other. + */ +class SpoofImpl : public UObject, + public IcuCApiHelper<USpoofChecker, SpoofImpl, USPOOF_MAGIC> { +public: + SpoofImpl(SpoofData *data, UErrorCode& status); + SpoofImpl(UErrorCode& status); + SpoofImpl(); + void construct(UErrorCode& status); + virtual ~SpoofImpl(); + + /** Copy constructor, used by the user level uspoof_clone() function. + */ + SpoofImpl(const SpoofImpl &src, UErrorCode &status); + + USpoofChecker *asUSpoofChecker(); + static SpoofImpl *validateThis(USpoofChecker *sc, UErrorCode &status); + static const SpoofImpl *validateThis(const USpoofChecker *sc, UErrorCode &status); + + /** Set and Get AllowedLocales, implementations of the corresponding API */ + void setAllowedLocales(const char *localesList, UErrorCode &status); + const char * getAllowedLocales(UErrorCode &status); + + // Add (union) to the UnicodeSet all of the characters for the scripts used for + // the specified locale. Part of the implementation of setAllowedLocales. + void addScriptChars(const char *locale, UnicodeSet *allowedChars, UErrorCode &status); + + // Functions implementing the features of UTS 39 section 5. + static void getAugmentedScriptSet(UChar32 codePoint, ScriptSet& result, UErrorCode& status); + void getResolvedScriptSet(const UnicodeString& input, ScriptSet& result, UErrorCode& status) const; + void getResolvedScriptSetWithout(const UnicodeString& input, UScriptCode script, ScriptSet& result, UErrorCode& status) const; + void getNumerics(const UnicodeString& input, UnicodeSet& result, UErrorCode& status) const; + URestrictionLevel getRestrictionLevel(const UnicodeString& input, UErrorCode& status) const; + + int32_t findHiddenOverlay(const UnicodeString& input, UErrorCode& status) const; + bool isIllegalCombiningDotLeadCharacter(UChar32 cp) const; + + /** parse a hex number. Untility used by the builders. */ + static UChar32 ScanHex(const UChar *s, int32_t start, int32_t limit, UErrorCode &status); + + static UClassID U_EXPORT2 getStaticClassID(void); + virtual UClassID getDynamicClassID(void) const; + + // + // Data Members + // + + int32_t fChecks; // Bit vector of checks to perform. + + SpoofData *fSpoofData; + + const UnicodeSet *fAllowedCharsSet; // The UnicodeSet of allowed characters. + // for this Spoof Checker. Defaults to all chars. + + const char *fAllowedLocales; // The list of allowed locales. + URestrictionLevel fRestrictionLevel; // The maximum restriction level for an acceptable identifier. +}; + +/** + * Class CheckResult corresponds directly to the plain C API opaque type + * USpoofCheckResult. One can be cast to the other. + */ +class CheckResult : public UObject, + public IcuCApiHelper<USpoofCheckResult, CheckResult, USPOOF_CHECK_MAGIC> { +public: + CheckResult(); + virtual ~CheckResult(); + + USpoofCheckResult *asUSpoofCheckResult(); + static CheckResult *validateThis(USpoofCheckResult *ptr, UErrorCode &status); + static const CheckResult *validateThis(const USpoofCheckResult *ptr, UErrorCode &status); + + void clear(); + + // Used to convert this CheckResult to the older int32_t return value API + int32_t toCombinedBitmask(int32_t expectedChecks); + + // Data Members + int32_t fChecks; // Bit vector of checks that were failed. + UnicodeSet fNumerics; // Set of numerics found in the string. + URestrictionLevel fRestrictionLevel; // The restriction level of the string. +}; + + +// +// Confusable Mappings Data Structures, version 2.0 +// +// For the confusable data, we are essentially implementing a map, +// key: a code point +// value: a string. Most commonly one char in length, but can be more. +// +// The keys are stored as a sorted array of 32 bit ints. +// bits 0-23 a code point value +// bits 24-31 length of value string, in UChars (between 1 and 256 UChars). +// The key table is sorted in ascending code point order. (not on the +// 32 bit int value, the flag bits do not participate in the sorting.) +// +// Lookup is done by means of a binary search in the key table. +// +// The corresponding values are kept in a parallel array of 16 bit ints. +// If the value string is of length 1, it is literally in the value array. +// For longer strings, the value array contains an index into the strings table. +// +// String Table: +// The strings table contains all of the value strings (those of length two or greater) +// concatentated together into one long UChar (UTF-16) array. +// +// There is no nul character or other mark between adjacent strings. +// +//---------------------------------------------------------------------------- +// +// Changes from format version 1 to format version 2: +// 1) Removal of the whole-script confusable data tables. +// 2) Removal of the SL/SA/ML/MA and multi-table flags in the key bitmask. +// 3) Expansion of string length value in the key bitmask from 2 bits to 8 bits. +// 4) Removal of the string lengths table since 8 bits is sufficient for the +// lengths of all entries in confusables.txt. + + + +// Internal functions for manipulating confusable data table keys +#define USPOOF_CONFUSABLE_DATA_FORMAT_VERSION 2 // version for ICU 58 +class ConfusableDataUtils { +public: + inline static UChar32 keyToCodePoint(int32_t key) { + return key & 0x00ffffff; + } + inline static int32_t keyToLength(int32_t key) { + return ((key & 0xff000000) >> 24) + 1; + } + inline static int32_t codePointAndLengthToKey(UChar32 codePoint, int32_t length) { + U_ASSERT((codePoint & 0x00ffffff) == codePoint); + U_ASSERT(length <= 256); + return codePoint | ((length - 1) << 24); + } +}; + + +//------------------------------------------------------------------------------------- +// +// SpoofData +// +// A small class that wraps the raw (usually memory mapped) spoof data. +// Serves two primary functions: +// 1. Convenience. Contains real pointers to the data, to avoid dealing with +// the offsets in the raw data. +// 2. Reference counting. When a spoof checker is cloned, the raw data is shared +// and must be retained until all checkers using the data are closed. +// Nothing in this struct includes state that is specific to any particular +// USpoofDetector object. +// +//--------------------------------------------------------------------------------------- +class SpoofData: public UMemory { + public: + static SpoofData* getDefault(UErrorCode &status); // Get standard ICU spoof data. + static void releaseDefault(); // Cleanup reference to default spoof data. + + SpoofData(UErrorCode &status); // Create new spoof data wrapper. + // Only used when building new data from rules. + + // Constructor for use when creating from prebuilt default data. + // A UDataMemory is what the ICU internal data loading functions provide. + // The udm is adopted by the SpoofData. + SpoofData(UDataMemory *udm, UErrorCode &status); + + // Constructor for use when creating from serialized data. + // + SpoofData(const void *serializedData, int32_t length, UErrorCode &status); + + // Check raw Spoof Data Version compatibility. + // Return TRUE it looks good. + UBool validateDataVersion(UErrorCode &status) const; + + ~SpoofData(); // Destructor not normally used. + // Use removeReference() instead. + // Reference Counting functions. + // Clone of a user-level spoof detector increments the ref count on the data. + // Close of a user-level spoof detector decrements the ref count. + // If the data is owned by us, it will be deleted when count goes to zero. + SpoofData *addReference(); + void removeReference(); + + // Reset all fields to an initial state. + // Called from the top of all constructors. + void reset(); + + // Copy this instance's raw data buffer to the specified address. + int32_t serialize(void *buf, int32_t capacity, UErrorCode &status) const; + + // Get the total number of bytes of data backed by this SpoofData. + // Not to be confused with length, which returns the number of confusable entries. + int32_t size() const; + + // Get the confusable skeleton transform for a single code point. + // The result is a string with a length between 1 and 18 as of Unicode 9. + // This is the main public endpoint for this class. + // @return The length in UTF-16 code units of the substition string. + int32_t confusableLookup(UChar32 inChar, UnicodeString &dest) const; + + // Get the number of confusable entries in this SpoofData. + int32_t length() const; + + // Get the code point (key) at the specified index. + UChar32 codePointAt(int32_t index) const; + + // Get the confusable skeleton (value) at the specified index. + // Append it to the specified UnicodeString&. + // @return The length in UTF-16 code units of the skeleton string. + int32_t appendValueTo(int32_t index, UnicodeString& dest) const; + + private: + // Reserve space in the raw data. For use by builder when putting together a + // new set of data. Init the new storage to zero, to prevent inconsistent + // results if it is not all otherwise set by the requester. + // Return: + // pointer to the new space that was added by this function. + void *reserveSpace(int32_t numBytes, UErrorCode &status); + + // initialize the pointers from this object to the raw data. + void initPtrs(UErrorCode &status); + + SpoofDataHeader *fRawData; // Ptr to the raw memory-mapped data + UBool fDataOwned; // True if the raw data is owned, and needs + // to be deleted when refcount goes to zero. + UDataMemory *fUDM; // If not NULL, our data came from a + // UDataMemory, which we must close when + // we are done. + + uint32_t fMemLimit; // Limit of available raw data space + u_atomic_int32_t fRefCount; + + // Confusable data + int32_t *fCFUKeys; + uint16_t *fCFUValues; + UChar *fCFUStrings; + + friend class ConfusabledataBuilder; +}; + +//--------------------------------------------------------------------------------------- +// +// Raw Binary Data Formats, as loaded from the ICU data file, +// or as built by the builder. +// +//--------------------------------------------------------------------------------------- +struct SpoofDataHeader { + int32_t fMagic; // (0x3845fdef) + uint8_t fFormatVersion[4]; // Data Format. Same as the value in struct UDataInfo + // if there is one associated with this data. + int32_t fLength; // Total lenght in bytes of this spoof data, + // including all sections, not just the header. + + // The following four sections refer to data representing the confusable data + // from the Unicode.org data from "confusables.txt" + + int32_t fCFUKeys; // byte offset to Keys table (from SpoofDataHeader *) + int32_t fCFUKeysSize; // number of entries in keys table (32 bits each) + + // TODO: change name to fCFUValues, for consistency. + int32_t fCFUStringIndex; // byte offset to String Indexes table + int32_t fCFUStringIndexSize; // number of entries in String Indexes table (16 bits each) + // (number of entries must be same as in Keys table + + int32_t fCFUStringTable; // byte offset of String table + int32_t fCFUStringTableLen; // length of string table (in 16 bit UChars) + + // The following sections are for data from xidmodifications.txt + + int32_t unused[15]; // Padding, Room for Expansion +}; + + + +U_NAMESPACE_END +#endif /* __cplusplus */ + +/** + * Endianness swap function for binary spoof data. + * @internal + */ +U_CAPI int32_t U_EXPORT2 +uspoof_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData, + UErrorCode *status); + + +#endif + +#endif /* USPOOFIM_H */ + |