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Unified Diff: icu46/source/i18n/uspoof_impl.h

Issue 5516007: Check in the pristine copy of ICU 4.6... (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 10 years ago
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Index: icu46/source/i18n/uspoof_impl.h
===================================================================
--- icu46/source/i18n/uspoof_impl.h (revision 0)
+++ icu46/source/i18n/uspoof_impl.h (revision 0)
@@ -0,0 +1,414 @@
+/*
+***************************************************************************
+* Copyright (C) 2008-2010, International Business Machines Corporation
+* and others. All Rights Reserved.
+***************************************************************************
+*
+* uspoof_impl.h
+*
+* Implemenation header for spoof detection
+*
+*/
+
+#ifndef USPOOFIM_H
+#define USPOOFIM_H
+
+#include "unicode/utypes.h"
+#include "unicode/uspoof.h"
+#include "utrie2.h"
+#include "unicode/uscript.h"
+#include "unicode/udata.h"
+
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#ifdef XP_CPLUSPLUS
+
+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
+
+class SpoofData;
+struct SpoofDataHeader;
+struct SpoofStringLengthsElement;
+class ScriptSet;
+
+/**
+ * Class SpoofImpl corresponds directly to the plain C API opaque type
+ * USpoofChecker. One can be cast to the other.
+ */
+class SpoofImpl : public UObject {
+public:
+ SpoofImpl(SpoofData *data, UErrorCode &status);
+ SpoofImpl();
+ virtual ~SpoofImpl();
+
+ /** Copy constructor, used by the user level uspoof_clone() function.
+ */
+ SpoofImpl(const SpoofImpl &src, UErrorCode &status);
+
+ static SpoofImpl *validateThis(USpoofChecker *sc, UErrorCode &status);
+ static const SpoofImpl *validateThis(const USpoofChecker *sc, UErrorCode &status);
+
+ /** Get the confusable skeleton transform for a single code point.
+ * The result is a string with a length between 1 and 18.
+ * @param tableMask bit flag specifying which confusable table to use.
+ * One of USPOOF_SL_TABLE_FLAG, USPOOF_MA_TABLE_FLAG, etc.
+ * @return The length in UTF-16 code units of the substition string.
+ */
+ int32_t confusableLookup(UChar32 inChar, int32_t tableMask, UChar *destBuf) const;
+
+ /** 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);
+
+
+ /** parse a hex number. Untility used by the builders. */
+ static UChar32 ScanHex(const UChar *s, int32_t start, int32_t limit, UErrorCode &status);
+
+ // Implementation for Whole Script tests.
+ // Return the test bit flag to be ORed into the eventual user return value
+ // if a Spoof opportunity is detected.
+ void wholeScriptCheck(
+ const UChar *text, int32_t length, ScriptSet *result, UErrorCode &status) const;
+
+ /** Scan a string to determine how many scripts it includes.
+ * Ignore characters with script=Common and scirpt=Inherited.
+ * @param text The UChar text to be scanned
+ * @param length The length of the input text, -1 for nul termintated.
+ * @param pos An out parameter, set to the first input postion at which
+ * a second script was encountered, ignoring Common and Inherited.
+ * @param status For errors.
+ * @return the number of (non-common,inherited) scripts encountered,
+ * clipped to a max of two.
+ */
+ int32_t scriptScan(const UChar *text, int32_t length, int32_t &pos, UErrorCode &status) const;
+
+
+ // WholeScript and MixedScript check implementation.
+ //
+ ScriptSet *WholeScriptCheck(const UChar *text, int32_t length, UErrorCode &status) const;
+
+ static UClassID U_EXPORT2 getStaticClassID(void);
+ virtual UClassID getDynamicClassID(void) const;
+
+ //
+ // Data Members
+ //
+
+ int32_t fMagic; // Internal sanity check.
+ int32_t fChecks; // Bit vector of checks to perform.
+
+ SpoofData *fSpoofData;
+
+ int32_t fCheckMask; // Spoof table selector. f(Check Type)
+
+ const UnicodeSet *fAllowedCharsSet; // The UnicodeSet of allowed characters.
+ // for this Spoof Checker. Defaults to all chars.
+
+ const char *fAllowedLocales; // The list of allowed locales.
+};
+
+
+
+//
+// Confusable Mappings Data Structures
+//
+// 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 flags
+// 24: 1 if entry applies to SL table
+// 25: 1 if entry applies to SA table
+// 26: 1 if entry applies to ML table
+// 27: 1 if entry applies to MA table
+// 28: 1 if there are multiple entries for this code point.
+// 29-30: length of value string, in UChars.
+// values are (1, 2, 3, other)
+// 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.
+//
+// The array is arranged by length of the strings - all strings of the same length
+// are stored together. The sections are ordered by length of the strings -
+// all two char strings first, followed by all of the three Char strings, etc.
+//
+// There is no nul character or other mark between adjacent strings.
+//
+// String Lengths table
+// The length of strings from 1 to 3 is flagged in the key table.
+// For strings of length 4 or longer, the string length table provides a
+// mapping between an index into the string table and the corresponding length.
+// Strings of these lengths are rare, so lookup time is not an issue.
+// Each entry consists of
+// uint16_t index of the _last_ string with this length
+// uint16_t the length
+//
+
+// Flag bits in the Key entries
+#define USPOOF_SL_TABLE_FLAG (1<<24)
+#define USPOOF_SA_TABLE_FLAG (1<<25)
+#define USPOOF_ML_TABLE_FLAG (1<<26)
+#define USPOOF_MA_TABLE_FLAG (1<<27)
+#define USPOOF_KEY_MULTIPLE_VALUES (1<<28)
+#define USPOOF_KEY_LENGTH_SHIFT 29
+#define USPOOF_KEY_LENGTH_FIELD(x) (((x)>>29) & 3)
+
+
+struct SpoofStringLengthsElement {
+ uint16_t fLastString; // index in string table of last string with this length
+ uint16_t fStrLength; // Length of strings
+};
+
+
+//-------------------------------------------------------------------------------
+//
+// ScriptSet - Wrapper class for the Script code bit sets that are part of the
+// whole script confusable data.
+//
+// This class is used both at data build and at run time.
+// The constructor is only used at build time.
+// At run time, just point at the prebuilt data and go.
+//
+//-------------------------------------------------------------------------------
+class ScriptSet: public UMemory {
+ public:
+ ScriptSet();
+ ~ScriptSet();
+
+ UBool operator == (const ScriptSet &other);
+ ScriptSet & operator = (const ScriptSet &other);
+
+ void Union(const ScriptSet &other);
+ void Union(UScriptCode script);
+ void intersect(const ScriptSet &other);
+ void intersect(UScriptCode script);
+ void setAll();
+ void resetAll();
+ int32_t countMembers();
+
+ private:
+ uint32_t bits[6];
+};
+
+
+
+
+//-------------------------------------------------------------------------------
+//
+// NFKDBuffer A little class to handle the NFKD normalization that is
+// needed on incoming identifiers to be checked.
+// Takes care of buffer handling and normalization
+//
+// Instances of this class are intended to be stack-allocated.
+//
+// TODO: how to map position offsets back to user values?
+//
+//--------------------------------------------------------------------------------
+class NFKDBuffer: public UMemory {
+public:
+ NFKDBuffer(const UChar *text, int32_t length, UErrorCode &status);
+ ~NFKDBuffer();
+ const UChar *getBuffer();
+ int32_t getLength();
+
+ private:
+ const UChar *fOriginalText;
+ UChar *fNormalizedText;
+ int32_t fNormalizedTextLength;
+ UChar fSmallBuf[USPOOF_STACK_BUFFER_SIZE];
+};
+
+
+
+
+
+//-------------------------------------------------------------------------------------
+//
+// 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); // Load standard ICU 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.
+ static UBool validateDataVersion(const SpoofDataHeader *rawData, UErrorCode &status);
+ ~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();
+
+ // 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);
+
+ // Reset all fields to an initial state.
+ // Called from the top of all constructors.
+ void reset();
+
+ 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're done.
+
+ uint32_t fMemLimit; // Limit of available raw data space
+ int32_t fRefCount;
+
+ // Confusable data
+ int32_t *fCFUKeys;
+ uint16_t *fCFUValues;
+ SpoofStringLengthsElement *fCFUStringLengths;
+ UChar *fCFUStrings;
+
+ // Whole Script Confusable Data
+ UTrie2 *fAnyCaseTrie;
+ UTrie2 *fLowerCaseTrie;
+ ScriptSet *fScriptSets;
+ };
+
+
+//---------------------------------------------------------------------------------------
+//
+// 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)
+
+ int32_t fCFUStringLengths; // byte offset to String Lengths table
+ int32_t fCFUStringLengthsSize; // number of entries in lengths table. (2 x 16 bits each)
+
+
+ // The following sections are for data from confusablesWholeScript.txt
+
+ int32_t fAnyCaseTrie; // byte offset to the serialized Any Case Trie
+ int32_t fAnyCaseTrieLength; // Length (bytes) of the serialized Any Case Trie
+
+ int32_t fLowerCaseTrie; // byte offset to the serialized Lower Case Trie
+ int32_t fLowerCaseTrieLength; // Length (bytes) of the serialized Lower Case Trie
+
+ int32_t fScriptSets; // byte offset to array of ScriptSets
+ int32_t fScriptSetsLength; // Number of ScriptSets (24 bytes each)
+
+
+ // The following sections are for data from xidmodifications.txt
+
+
+ int32_t unused[15]; // Padding, Room for Expansion
+
+ };
+
+
+
+
+//
+// Structure for the Whole Script Confusable Data
+// See Unicode UAX-39, Unicode Security Mechanisms, for a description of the
+// Whole Script confusable data
+//
+// The data provides mappings from code points to a set of scripts
+// that contain characters that might be confused with the code point.
+// There are two mappings, one for lower case only, and one for characters
+// of any case.
+//
+// The actual data consists of a utrie2 to map from a code point to an offset,
+// and an array of UScriptSets (essentially bit maps) that is indexed
+// by the offsets obtained from the Trie.
+//
+//
+
+
+U_NAMESPACE_END
+#endif /* XP_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 */
+
Property changes on: icu46/source/i18n/uspoof_impl.h
___________________________________________________________________
Added: svn:eol-style
+ LF
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