78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
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#include <wininetp.h>
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#include "cpevalrule.h"
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/*
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Evaluation-rule parser
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For IE6 the only type of rules accepted are include-exclude rules.
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These rules have the format FOO&BAR&!XYZ=r
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This translates to "if policy has FOO and BAR but not XYZ, then reject"
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Important points:
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- Logical rules are enclosed in forward slashes.
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- No white spaces allowed in a rule.
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*/
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CPEvalRule *parseEvalRule(char *pszRule, char **ppEndRule) {
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const char *pch = pszRule;
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/* skip over white space */
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while (isspace(*pch))
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pch++;
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IncludeExcludeRule *pRule = new IncludeExcludeRule();
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/* If no explicit decision is given, we will assume REJECT */
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pRule->setDecision(COOKIE_STATE_REJECT);
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/* This flag keeps track of whether the next symbol is in the
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include-set or exclude-set */
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bool fNegate = false;
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do {
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int symindex;
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char achToken[64];
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/* when parsing rules, the tokens are not always seperated by
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white space-- instead the character class (eg. alphabetic,
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numeric, punctuation, etc.) is significant */
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pch = getNextToken(pch, achToken, sizeof(achToken), false);
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char ch = achToken[0];
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if (ch=='!')
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fNegate = true;
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else if (ch=='&')
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fNegate = false;
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else if (ch=='=') {
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int outcome = mapCookieAction(*pch);
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if (outcome==COOKIE_STATE_UNKNOWN) {
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delete pRule;
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pRule = NULL;
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}
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else
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pRule->setDecision(outcome);
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pch++;
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break;
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}
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else if ( (symindex=findSymbol(achToken)) >= 0) {
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/* this is a recognized P3P compact-policy symbol--
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depending on existence of preceding NOT operator,
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modify rule to include or exclude the token */
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if (fNegate)
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pRule->exclude(symindex);
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else
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pRule->include(symindex);
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}
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}
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while (*pch);
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/* indicate end of the rule in optional out parameter */
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if (ppEndRule)
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*ppEndRule = (char*) pch;
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return pRule;
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}
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