1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 ***************************************************************************
5 * Copyright (C) 2008-2013, International Business Machines Corporation
6 * and others. All Rights Reserved.
7 ***************************************************************************
11 * Implemenation header for spoof detection
19 #include "unicode/utypes.h"
20 #include "unicode/uspoof.h"
21 #include "unicode/uscript.h"
22 #include "unicode/udata.h"
26 #if !UCONFIG_NO_NORMALIZATION
32 // The maximium length (in UTF-16 UChars) of the skeleton replacement string resulting from
33 // a single input code point. This is function of the unicode.org data.
34 #define USPOOF_MAX_SKELETON_EXPANSION 20
36 // The default stack buffer size for copies or conversions or normalizations
37 // of input strings being checked. (Used in multiple places.)
38 #define USPOOF_STACK_BUFFER_SIZE 100
40 // Magic number for sanity checking spoof data.
41 #define USPOOF_MAGIC 0x3845fdef
43 // Magic number for sanity checking spoof checkers.
44 #define USPOOF_CHECK_MAGIC 0x2734ecde
48 struct SpoofDataHeader;
49 class ConfusableDataUtils;
52 * Class SpoofImpl corresponds directly to the plain C API opaque type
53 * USpoofChecker. One can be cast to the other.
55 class SpoofImpl : public UObject {
57 SpoofImpl(SpoofData *data, UErrorCode& status);
58 SpoofImpl(UErrorCode& status);
60 void construct(UErrorCode& status);
63 /** Copy constructor, used by the user level uspoof_clone() function.
65 SpoofImpl(const SpoofImpl &src, UErrorCode &status);
67 USpoofChecker *asUSpoofChecker();
68 static SpoofImpl *validateThis(USpoofChecker *sc, UErrorCode &status);
69 static const SpoofImpl *validateThis(const USpoofChecker *sc, UErrorCode &status);
71 /** Set and Get AllowedLocales, implementations of the corresponding API */
72 void setAllowedLocales(const char *localesList, UErrorCode &status);
73 const char * getAllowedLocales(UErrorCode &status);
75 // Add (union) to the UnicodeSet all of the characters for the scripts used for
76 // the specified locale. Part of the implementation of setAllowedLocales.
77 void addScriptChars(const char *locale, UnicodeSet *allowedChars, UErrorCode &status);
79 // Functions implementing the features of UTS 39 section 5.
80 static void getAugmentedScriptSet(UChar32 codePoint, ScriptSet& result, UErrorCode& status);
81 void getResolvedScriptSet(const UnicodeString& input, ScriptSet& result, UErrorCode& status) const;
82 void getResolvedScriptSetWithout(const UnicodeString& input, UScriptCode script, ScriptSet& result, UErrorCode& status) const;
83 void getNumerics(const UnicodeString& input, UnicodeSet& result, UErrorCode& status) const;
84 URestrictionLevel getRestrictionLevel(const UnicodeString& input, UErrorCode& status) const;
86 /** parse a hex number. Untility used by the builders. */
87 static UChar32 ScanHex(const UChar *s, int32_t start, int32_t limit, UErrorCode &status);
89 static UClassID U_EXPORT2 getStaticClassID(void);
90 virtual UClassID getDynamicClassID(void) const;
96 int32_t fMagic; // Internal sanity check.
97 int32_t fChecks; // Bit vector of checks to perform.
99 SpoofData *fSpoofData;
101 const UnicodeSet *fAllowedCharsSet; // The UnicodeSet of allowed characters.
102 // for this Spoof Checker. Defaults to all chars.
104 const char *fAllowedLocales; // The list of allowed locales.
105 URestrictionLevel fRestrictionLevel; // The maximum restriction level for an acceptable identifier.
109 * Class CheckResult corresponds directly to the plain C API opaque type
110 * USpoofCheckResult. One can be cast to the other.
112 class CheckResult : public UObject {
115 virtual ~CheckResult();
117 USpoofCheckResult *asUSpoofCheckResult();
118 static CheckResult *validateThis(USpoofCheckResult *ptr, UErrorCode &status);
119 static const CheckResult *validateThis(const USpoofCheckResult *ptr, UErrorCode &status);
123 // Used to convert this CheckResult to the older int32_t return value API
124 int32_t toCombinedBitmask(int32_t expectedChecks);
127 int32_t fMagic; // Internal sanity check.
128 int32_t fChecks; // Bit vector of checks that were failed.
129 UnicodeSet fNumerics; // Set of numerics found in the string.
130 URestrictionLevel fRestrictionLevel; // The restriction level of the string.
135 // Confusable Mappings Data Structures, version 2.0
137 // For the confusable data, we are essentially implementing a map,
139 // value: a string. Most commonly one char in length, but can be more.
141 // The keys are stored as a sorted array of 32 bit ints.
142 // bits 0-23 a code point value
143 // bits 24-31 length of value string, in UChars (between 1 and 256 UChars).
144 // The key table is sorted in ascending code point order. (not on the
145 // 32 bit int value, the flag bits do not participate in the sorting.)
147 // Lookup is done by means of a binary search in the key table.
149 // The corresponding values are kept in a parallel array of 16 bit ints.
150 // If the value string is of length 1, it is literally in the value array.
151 // For longer strings, the value array contains an index into the strings table.
154 // The strings table contains all of the value strings (those of length two or greater)
155 // concatentated together into one long UChar (UTF-16) array.
157 // There is no nul character or other mark between adjacent strings.
159 //----------------------------------------------------------------------------
161 // Changes from format version 1 to format version 2:
162 // 1) Removal of the whole-script confusable data tables.
163 // 2) Removal of the SL/SA/ML/MA and multi-table flags in the key bitmask.
164 // 3) Expansion of string length value in the key bitmask from 2 bits to 8 bits.
165 // 4) Removal of the string lengths table since 8 bits is sufficient for the
166 // lengths of all entries in confusables.txt.
170 // Internal functions for manipulating confusable data table keys
171 #define USPOOF_CONFUSABLE_DATA_FORMAT_VERSION 2 // version for ICU 58
172 class ConfusableDataUtils {
174 inline static UChar32 keyToCodePoint(int32_t key) {
175 return key & 0x00ffffff;
177 inline static int32_t keyToLength(int32_t key) {
178 return ((key & 0xff000000) >> 24) + 1;
180 inline static int32_t codePointAndLengthToKey(UChar32 codePoint, int32_t length) {
181 U_ASSERT((codePoint & 0x00ffffff) == codePoint);
182 U_ASSERT(length <= 256);
183 return codePoint | ((length - 1) << 24);
188 //-------------------------------------------------------------------------------------
192 // A small class that wraps the raw (usually memory mapped) spoof data.
193 // Serves two primary functions:
194 // 1. Convenience. Contains real pointers to the data, to avoid dealing with
195 // the offsets in the raw data.
196 // 2. Reference counting. When a spoof checker is cloned, the raw data is shared
197 // and must be retained until all checkers using the data are closed.
198 // Nothing in this struct includes state that is specific to any particular
199 // USpoofDetector object.
201 //---------------------------------------------------------------------------------------
202 class SpoofData: public UMemory {
204 static SpoofData* getDefault(UErrorCode &status); // Get standard ICU spoof data.
205 static void releaseDefault(); // Cleanup reference to default spoof data.
207 SpoofData(UErrorCode &status); // Create new spoof data wrapper.
208 // Only used when building new data from rules.
210 // Constructor for use when creating from prebuilt default data.
211 // A UDataMemory is what the ICU internal data loading functions provide.
212 // The udm is adopted by the SpoofData.
213 SpoofData(UDataMemory *udm, UErrorCode &status);
215 // Constructor for use when creating from serialized data.
217 SpoofData(const void *serializedData, int32_t length, UErrorCode &status);
219 // Check raw Spoof Data Version compatibility.
220 // Return TRUE it looks good.
221 UBool validateDataVersion(UErrorCode &status) const;
223 ~SpoofData(); // Destructor not normally used.
224 // Use removeReference() instead.
225 // Reference Counting functions.
226 // Clone of a user-level spoof detector increments the ref count on the data.
227 // Close of a user-level spoof detector decrements the ref count.
228 // If the data is owned by us, it will be deleted when count goes to zero.
229 SpoofData *addReference();
230 void removeReference();
232 // Reset all fields to an initial state.
233 // Called from the top of all constructors.
236 // Copy this instance's raw data buffer to the specified address.
237 int32_t serialize(void *buf, int32_t capacity, UErrorCode &status) const;
239 // Get the total number of bytes of data backed by this SpoofData.
240 // Not to be confused with length, which returns the number of confusable entries.
241 int32_t size() const;
243 // Get the confusable skeleton transform for a single code point.
244 // The result is a string with a length between 1 and 18 as of Unicode 9.
245 // This is the main public endpoint for this class.
246 // @return The length in UTF-16 code units of the substition string.
247 int32_t confusableLookup(UChar32 inChar, UnicodeString &dest) const;
249 // Get the number of confusable entries in this SpoofData.
250 int32_t length() const;
252 // Get the code point (key) at the specified index.
253 UChar32 codePointAt(int32_t index) const;
255 // Get the confusable skeleton (value) at the specified index.
256 // Append it to the specified UnicodeString&.
257 // @return The length in UTF-16 code units of the skeleton string.
258 int32_t appendValueTo(int32_t index, UnicodeString& dest) const;
261 // Reserve space in the raw data. For use by builder when putting together a
262 // new set of data. Init the new storage to zero, to prevent inconsistent
263 // results if it is not all otherwise set by the requester.
265 // pointer to the new space that was added by this function.
266 void *reserveSpace(int32_t numBytes, UErrorCode &status);
268 // initialize the pointers from this object to the raw data.
269 void initPtrs(UErrorCode &status);
271 SpoofDataHeader *fRawData; // Ptr to the raw memory-mapped data
272 UBool fDataOwned; // True if the raw data is owned, and needs
273 // to be deleted when refcount goes to zero.
274 UDataMemory *fUDM; // If not NULL, our data came from a
275 // UDataMemory, which we must close when
278 uint32_t fMemLimit; // Limit of available raw data space
279 u_atomic_int32_t fRefCount;
283 uint16_t *fCFUValues;
286 friend class ConfusabledataBuilder;
289 //---------------------------------------------------------------------------------------
291 // Raw Binary Data Formats, as loaded from the ICU data file,
292 // or as built by the builder.
294 //---------------------------------------------------------------------------------------
295 struct SpoofDataHeader {
296 int32_t fMagic; // (0x3845fdef)
297 uint8_t fFormatVersion[4]; // Data Format. Same as the value in struct UDataInfo
298 // if there is one associated with this data.
299 int32_t fLength; // Total lenght in bytes of this spoof data,
300 // including all sections, not just the header.
302 // The following four sections refer to data representing the confusable data
303 // from the Unicode.org data from "confusables.txt"
305 int32_t fCFUKeys; // byte offset to Keys table (from SpoofDataHeader *)
306 int32_t fCFUKeysSize; // number of entries in keys table (32 bits each)
308 // TODO: change name to fCFUValues, for consistency.
309 int32_t fCFUStringIndex; // byte offset to String Indexes table
310 int32_t fCFUStringIndexSize; // number of entries in String Indexes table (16 bits each)
311 // (number of entries must be same as in Keys table
313 int32_t fCFUStringTable; // byte offset of String table
314 int32_t fCFUStringTableLen; // length of string table (in 16 bit UChars)
316 // The following sections are for data from xidmodifications.txt
318 int32_t unused[15]; // Padding, Room for Expansion
324 #endif /* __cplusplus */
327 * Endianness swap function for binary spoof data.
330 U_CAPI int32_t U_EXPORT2
331 uspoof_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData,
337 #endif /* USPOOFIM_H */