437 lines
18 KiB
C++
437 lines
18 KiB
C++
/*
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******************************************************************************
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*
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* Copyright (C) 2008-2013, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: uspoof_wsconf.cpp
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2009Jan05 (refactoring earlier files)
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* created by: Andy Heninger
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*
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* Internal functions for compililing Whole Script confusable source data
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* into its binary (runtime) form. The binary data format is described
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* in uspoof_impl.h
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*/
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#include "unicode/utypes.h"
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#include "unicode/uspoof.h"
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#if !UCONFIG_NO_NORMALIZATION
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#if !UCONFIG_NO_REGULAR_EXPRESSIONS
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#include "unicode/unorm.h"
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#include "unicode/uregex.h"
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#include "unicode/ustring.h"
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#include "cmemory.h"
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#include "scriptset.h"
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#include "uspoof_impl.h"
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#include "uhash.h"
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#include "uvector.h"
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#include "uassert.h"
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#include "uspoof_wsconf.h"
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U_NAMESPACE_USE
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// Regular expression for parsing a line from the Unicode file confusablesWholeScript.txt
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// Example Lines:
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// 006F ; Latn; Deva; A # (o) LATIN SMALL LETTER O
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// 0048..0049 ; Latn; Grek; A # [2] (H..I) LATIN CAPITAL LETTER H..LATIN CAPITAL LETTER I
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// | | | |
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// | | | |---- Which table, Any Case or Lower Case (A or L)
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// | | |----------Target script. We need this.
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// | |----------------Src script. Should match the script of the source
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// | code points. Beyond checking that, we don't keep it.
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// |--------------------------------Source code points or range.
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//
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// The expression will match _all_ lines, including erroneous lines.
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// The result of the parse is returned via the contents of the (match) groups.
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static const char *parseExp =
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"(?m)" // Multi-line mode
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"^([ \\t]*(?:#.*?)?)$" // A blank or comment line. Matches Group 1.
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"|^(?:" // OR
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"\\s*([0-9A-F]{4,})(?:..([0-9A-F]{4,}))?\\s*;" // Code point range. Groups 2 and 3.
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"\\s*([A-Za-z]+)\\s*;" // The source script. Group 4.
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"\\s*([A-Za-z]+)\\s*;" // The target script. Group 5.
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"\\s*(?:(A)|(L))" // The table A or L. Group 6 or 7
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"[ \\t]*(?:#.*?)?" // Trailing commment
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")$|" // OR
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"^(.*?)$"; // An error line. Group 8.
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// Any line not matching the preceding
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// parts of the expression.will match
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// this, and thus be flagged as an error
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// Extract a regular expression match group into a char * string.
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// The group must contain only invariant characters.
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// Used for script names
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//
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static void extractGroup(
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URegularExpression *e, int32_t group, char *destBuf, int32_t destCapacity, UErrorCode &status) {
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UChar ubuf[50];
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ubuf[0] = 0;
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destBuf[0] = 0;
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int32_t len = uregex_group(e, group, ubuf, 50, &status);
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if (U_FAILURE(status) || len == -1 || len >= destCapacity) {
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return;
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}
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UnicodeString s(FALSE, ubuf, len); // Aliasing constructor
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s.extract(0, len, destBuf, destCapacity, US_INV);
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}
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U_NAMESPACE_BEGIN
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// Build the Whole Script Confusable data
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//
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// TODO: Reorganize. Either get rid of the WSConfusableDataBuilder class,
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// because everything is local to this one build function anyhow,
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// OR
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// break this function into more reasonably sized pieces, with
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// state in WSConfusableDataBuilder.
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//
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void buildWSConfusableData(SpoofImpl *spImpl, const char * confusablesWS,
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int32_t confusablesWSLen, UParseError *pe, UErrorCode &status)
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{
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if (U_FAILURE(status)) {
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return;
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}
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URegularExpression *parseRegexp = NULL;
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int32_t inputLen = 0;
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UChar *input = NULL;
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int32_t lineNum = 0;
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UVector *scriptSets = NULL;
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uint32_t rtScriptSetsCount = 2;
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UTrie2 *anyCaseTrie = NULL;
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UTrie2 *lowerCaseTrie = NULL;
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anyCaseTrie = utrie2_open(0, 0, &status);
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lowerCaseTrie = utrie2_open(0, 0, &status);
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UnicodeString pattern(parseExp, -1, US_INV);
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// The scriptSets vector provides a mapping from TRIE values to the set of scripts.
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//
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// Reserved TRIE values:
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// 0: Code point has no whole script confusables.
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// 1: Code point is of script Common or Inherited.
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// These code points do not participate in whole script confusable detection.
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// (This is logically equivalent to saying that they contain confusables in
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// all scripts)
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//
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// Because Trie values are indexes into the ScriptSets vector, pre-fill
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// vector positions 0 and 1 to avoid conflicts with the reserved values.
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scriptSets = new UVector(status);
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if (scriptSets == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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scriptSets->addElement((void *)NULL, status);
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scriptSets->addElement((void *)NULL, status);
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// Convert the user input data from UTF-8 to UChar (UTF-16)
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u_strFromUTF8(NULL, 0, &inputLen, confusablesWS, confusablesWSLen, &status);
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if (status != U_BUFFER_OVERFLOW_ERROR) {
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goto cleanup;
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}
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status = U_ZERO_ERROR;
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input = static_cast<UChar *>(uprv_malloc((inputLen+1) * sizeof(UChar)));
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if (input == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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u_strFromUTF8(input, inputLen+1, NULL, confusablesWS, confusablesWSLen, &status);
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parseRegexp = uregex_open(pattern.getBuffer(), pattern.length(), 0, NULL, &status);
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// Zap any Byte Order Mark at the start of input. Changing it to a space is benign
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// given the syntax of the input.
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if (*input == 0xfeff) {
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*input = 0x20;
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}
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// Parse the input, one line per iteration of this loop.
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uregex_setText(parseRegexp, input, inputLen, &status);
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while (uregex_findNext(parseRegexp, &status)) {
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lineNum++;
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if (uregex_start(parseRegexp, 1, &status) >= 0) {
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// this was a blank or comment line.
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continue;
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}
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if (uregex_start(parseRegexp, 8, &status) >= 0) {
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// input file syntax error.
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status = U_PARSE_ERROR;
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goto cleanup;
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}
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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// Pick up the start and optional range end code points from the parsed line.
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UChar32 startCodePoint = SpoofImpl::ScanHex(
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input, uregex_start(parseRegexp, 2, &status), uregex_end(parseRegexp, 2, &status), status);
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UChar32 endCodePoint = startCodePoint;
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if (uregex_start(parseRegexp, 3, &status) >=0) {
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endCodePoint = SpoofImpl::ScanHex(
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input, uregex_start(parseRegexp, 3, &status), uregex_end(parseRegexp, 3, &status), status);
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}
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// Extract the two script names from the source line. We need these in an 8 bit
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// default encoding (will be EBCDIC on IBM mainframes) in order to pass them on
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// to the ICU u_getPropertyValueEnum() function. Ugh.
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char srcScriptName[20];
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char targScriptName[20];
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extractGroup(parseRegexp, 4, srcScriptName, sizeof(srcScriptName), status);
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extractGroup(parseRegexp, 5, targScriptName, sizeof(targScriptName), status);
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UScriptCode srcScript =
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static_cast<UScriptCode>(u_getPropertyValueEnum(UCHAR_SCRIPT, srcScriptName));
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UScriptCode targScript =
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static_cast<UScriptCode>(u_getPropertyValueEnum(UCHAR_SCRIPT, targScriptName));
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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if (srcScript == USCRIPT_INVALID_CODE || targScript == USCRIPT_INVALID_CODE) {
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status = U_INVALID_FORMAT_ERROR;
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goto cleanup;
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}
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// select the table - (A) any case or (L) lower case only
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UTrie2 *table = anyCaseTrie;
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if (uregex_start(parseRegexp, 7, &status) >= 0) {
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table = lowerCaseTrie;
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}
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// Build the set of scripts containing confusable characters for
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// the code point(s) specified in this input line.
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// Sanity check that the script of the source code point is the same
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// as the source script indicated in the input file. Failure of this check is
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// an error in the input file.
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// Include the source script in the set (needed for Mixed Script Confusable detection).
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//
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UChar32 cp;
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for (cp=startCodePoint; cp<=endCodePoint; cp++) {
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int32_t setIndex = utrie2_get32(table, cp);
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BuilderScriptSet *bsset = NULL;
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if (setIndex > 0) {
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U_ASSERT(setIndex < scriptSets->size());
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bsset = static_cast<BuilderScriptSet *>(scriptSets->elementAt(setIndex));
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} else {
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bsset = new BuilderScriptSet();
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if (bsset == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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bsset->codePoint = cp;
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bsset->trie = table;
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bsset->sset = new ScriptSet();
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setIndex = scriptSets->size();
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bsset->index = setIndex;
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bsset->rindex = 0;
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if (bsset->sset == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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scriptSets->addElement(bsset, status);
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utrie2_set32(table, cp, setIndex, &status);
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}
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bsset->sset->set(targScript, status);
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bsset->sset->set(srcScript, status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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UScriptCode cpScript = uscript_getScript(cp, &status);
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if (cpScript != srcScript) {
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status = U_INVALID_FORMAT_ERROR;
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goto cleanup;
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}
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}
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}
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// Eliminate duplicate script sets. At this point we have a separate
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// script set for every code point that had data in the input file.
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//
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// We eliminate underlying ScriptSet objects, not the BuildScriptSets that wrap them
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//
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// printf("Number of scriptSets: %d\n", scriptSets->size());
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{
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int32_t duplicateCount = 0;
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rtScriptSetsCount = 2;
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for (int32_t outeri=2; outeri<scriptSets->size(); outeri++) {
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BuilderScriptSet *outerSet = static_cast<BuilderScriptSet *>(scriptSets->elementAt(outeri));
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if (outerSet->index != static_cast<uint32_t>(outeri)) {
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// This set was already identified as a duplicate.
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// It will not be allocated a position in the runtime array of ScriptSets.
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continue;
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}
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outerSet->rindex = rtScriptSetsCount++;
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for (int32_t inneri=outeri+1; inneri<scriptSets->size(); inneri++) {
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BuilderScriptSet *innerSet = static_cast<BuilderScriptSet *>(scriptSets->elementAt(inneri));
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if (*(outerSet->sset) == *(innerSet->sset) && outerSet->sset != innerSet->sset) {
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delete innerSet->sset;
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innerSet->scriptSetOwned = FALSE;
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innerSet->sset = outerSet->sset;
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innerSet->index = outeri;
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innerSet->rindex = outerSet->rindex;
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duplicateCount++;
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}
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// But this doesn't get all. We need to fix the TRIE.
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}
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}
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// printf("Number of distinct script sets: %d\n", rtScriptSetsCount);
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}
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// Update the Trie values to be reflect the run time script indexes (after duplicate merging).
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// (Trie Values 0 and 1 are reserved, and the corresponding slots in scriptSets
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// are unused, which is why the loop index starts at 2.)
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{
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for (int32_t i=2; i<scriptSets->size(); i++) {
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BuilderScriptSet *bSet = static_cast<BuilderScriptSet *>(scriptSets->elementAt(i));
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if (bSet->rindex != (uint32_t)i) {
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utrie2_set32(bSet->trie, bSet->codePoint, bSet->rindex, &status);
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}
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}
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}
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// For code points with script==Common or script==Inherited,
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// Set the reserved value of 1 into both Tries. These characters do not participate
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// in Whole Script Confusable detection; this reserved value is the means
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// by which they are detected.
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{
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UnicodeSet ignoreSet;
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ignoreSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_COMMON, status);
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UnicodeSet inheritedSet;
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inheritedSet.applyIntPropertyValue(UCHAR_SCRIPT, USCRIPT_INHERITED, status);
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ignoreSet.addAll(inheritedSet);
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for (int32_t rn=0; rn<ignoreSet.getRangeCount(); rn++) {
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UChar32 rangeStart = ignoreSet.getRangeStart(rn);
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UChar32 rangeEnd = ignoreSet.getRangeEnd(rn);
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utrie2_setRange32(anyCaseTrie, rangeStart, rangeEnd, 1, TRUE, &status);
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utrie2_setRange32(lowerCaseTrie, rangeStart, rangeEnd, 1, TRUE, &status);
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}
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}
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// Serialize the data to the Spoof Detector
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{
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utrie2_freeze(anyCaseTrie, UTRIE2_16_VALUE_BITS, &status);
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int32_t size = utrie2_serialize(anyCaseTrie, NULL, 0, &status);
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// printf("Any case Trie size: %d\n", size);
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if (status != U_BUFFER_OVERFLOW_ERROR) {
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goto cleanup;
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}
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status = U_ZERO_ERROR;
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spImpl->fSpoofData->fRawData->fAnyCaseTrie = spImpl->fSpoofData->fMemLimit;
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spImpl->fSpoofData->fRawData->fAnyCaseTrieLength = size;
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spImpl->fSpoofData->fAnyCaseTrie = anyCaseTrie;
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void *where = spImpl->fSpoofData->reserveSpace(size, status);
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utrie2_serialize(anyCaseTrie, where, size, &status);
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utrie2_freeze(lowerCaseTrie, UTRIE2_16_VALUE_BITS, &status);
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size = utrie2_serialize(lowerCaseTrie, NULL, 0, &status);
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// printf("Lower case Trie size: %d\n", size);
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if (status != U_BUFFER_OVERFLOW_ERROR) {
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goto cleanup;
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}
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status = U_ZERO_ERROR;
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spImpl->fSpoofData->fRawData->fLowerCaseTrie = spImpl->fSpoofData->fMemLimit;
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spImpl->fSpoofData->fRawData->fLowerCaseTrieLength = size;
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spImpl->fSpoofData->fLowerCaseTrie = lowerCaseTrie;
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where = spImpl->fSpoofData->reserveSpace(size, status);
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utrie2_serialize(lowerCaseTrie, where, size, &status);
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spImpl->fSpoofData->fRawData->fScriptSets = spImpl->fSpoofData->fMemLimit;
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spImpl->fSpoofData->fRawData->fScriptSetsLength = rtScriptSetsCount;
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ScriptSet *rtScriptSets = static_cast<ScriptSet *>
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(spImpl->fSpoofData->reserveSpace(rtScriptSetsCount * sizeof(ScriptSet), status));
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uint32_t rindex = 2;
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for (int32_t i=2; i<scriptSets->size(); i++) {
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BuilderScriptSet *bSet = static_cast<BuilderScriptSet *>(scriptSets->elementAt(i));
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if (bSet->rindex < rindex) {
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// We have already copied this script set to the serialized data.
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continue;
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}
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U_ASSERT(rindex == bSet->rindex);
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rtScriptSets[rindex] = *bSet->sset; // Assignment of a ScriptSet just copies the bits.
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rindex++;
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}
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}
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// Open new utrie2s from the serialized data. We don't want to keep the ones
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// we just built because we would then have two copies of the data, one internal to
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// the utries that we have already constructed, and one in the serialized data area.
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// An alternative would be to not pre-serialize the Trie data, but that makes the
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// spoof detector data different, depending on how the detector was constructed.
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// It's simpler to keep the data always the same.
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spImpl->fSpoofData->fAnyCaseTrie = utrie2_openFromSerialized(
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UTRIE2_16_VALUE_BITS,
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(const char *)spImpl->fSpoofData->fRawData + spImpl->fSpoofData->fRawData->fAnyCaseTrie,
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spImpl->fSpoofData->fRawData->fAnyCaseTrieLength,
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NULL,
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&status);
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spImpl->fSpoofData->fLowerCaseTrie = utrie2_openFromSerialized(
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UTRIE2_16_VALUE_BITS,
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(const char *)spImpl->fSpoofData->fRawData + spImpl->fSpoofData->fRawData->fLowerCaseTrie,
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spImpl->fSpoofData->fRawData->fAnyCaseTrieLength,
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NULL,
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&status);
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cleanup:
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if (U_FAILURE(status)) {
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pe->line = lineNum;
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}
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uregex_close(parseRegexp);
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uprv_free(input);
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int32_t i;
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if (scriptSets != NULL) {
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for (i=0; i<scriptSets->size(); i++) {
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BuilderScriptSet *bsset = static_cast<BuilderScriptSet *>(scriptSets->elementAt(i));
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delete bsset;
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}
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delete scriptSets;
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}
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utrie2_close(anyCaseTrie);
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utrie2_close(lowerCaseTrie);
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return;
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}
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U_NAMESPACE_END
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BuilderScriptSet::BuilderScriptSet() {
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codePoint = -1;
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trie = NULL;
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sset = NULL;
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index = 0;
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rindex = 0;
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scriptSetOwned = TRUE;
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}
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BuilderScriptSet::~BuilderScriptSet() {
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if (scriptSetOwned) {
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delete sset;
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}
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}
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#endif
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#endif // !UCONFIG_NO_REGULAR_EXPRESSIONS
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