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