The Tor Browser: intl/icu/source/extra/scrptrun/scrptrun.cpp@129ffea94266 (annotated)

intl/icu/source/extra/scrptrun/scrptrun.cpp@129ffea94266 (annotated)

intl/icu/source/extra/scrptrun/scrptrun.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  *******************************************************************************
  *
  *   Copyright (C) 1999-2001, International Business Machines
  *   Corporation and others.  All Rights Reserved.
  *
  *******************************************************************************
  *   file name:  scrptrun.cpp
  *
  *   created on: 10/17/2001
  *   created by: Eric R. Mader
  */
 #include "unicode/utypes.h"
 #include "unicode/uscript.h"
 #include "scrptrun.h"
 #define ARRAY_SIZE(array) (sizeof array  / sizeof array[0])
 const char ScriptRun::fgClassID=0;
 UChar32 ScriptRun::pairedChars[] = {
 x0028, 0x0029, // ascii paired punctuation
 x003c, 0x003e,
 x005b, 0x005d,
 x007b, 0x007d,
 x00ab, 0x00bb, // guillemets
 x2018, 0x2019, // general punctuation
 x201c, 0x201d,
 x2039, 0x203a,
 x3008, 0x3009, // chinese paired punctuation
 x300a, 0x300b,
 x300c, 0x300d,
 x300e, 0x300f,
 x3010, 0x3011,
 x3014, 0x3015,
 x3016, 0x3017,
 x3018, 0x3019,
 x301a, 0x301b
 };
 const int32_t ScriptRun::pairedCharCount = ARRAY_SIZE(pairedChars);
 const int32_t ScriptRun::pairedCharPower = 1 << highBit(pairedCharCount);
 const int32_t ScriptRun::pairedCharExtra = pairedCharCount - pairedCharPower;
 int8_t ScriptRun::highBit(int32_t value)
 {
     if (value <= 0) {
         return -32;
     }
     int8_t bit = 0;
     if (value >= 1 << 16) {
         value >>= 16;
         bit += 16;
     }
     if (value >= 1 << 8) {
         value >>= 8;
         bit += 8;
     }
     if (value >= 1 << 4) {
         value >>= 4;
         bit += 4;
     }
     if (value >= 1 << 2) {
         value >>= 2;
         bit += 2;
     }
     if (value >= 1 << 1) {
         value >>= 1;
         bit += 1;
     }
     return bit;
 }
 int32_t ScriptRun::getPairIndex(UChar32 ch)
 {
     int32_t probe = pairedCharPower;
     int32_t index = 0;
     if (ch >= pairedChars[pairedCharExtra]) {
         index = pairedCharExtra;
     }
     while (probe > (1 << 0)) {
         probe >>= 1;
         if (ch >= pairedChars[index + probe]) {
             index += probe;
         }
     }
     if (pairedChars[index] != ch) {
         index = -1;
     }
     return index;
 }
 UBool ScriptRun::sameScript(int32_t scriptOne, int32_t scriptTwo)
 {
     return scriptOne <= USCRIPT_INHERITED || scriptTwo <= USCRIPT_INHERITED || scriptOne == scriptTwo;
 }
 UBool ScriptRun::next()
 {
     int32_t startSP  = parenSP;  // used to find the first new open character
     UErrorCode error = U_ZERO_ERROR;
     // if we've fallen off the end of the text, we're done
     if (scriptEnd >= charLimit) {
         return false;
     }
     scriptCode = USCRIPT_COMMON;
     for (scriptStart = scriptEnd; scriptEnd < charLimit; scriptEnd += 1) {
         UChar   high = charArray[scriptEnd];
         UChar32 ch   = high;
         // if the character is a high surrogate and it's not the last one
         // in the text, see if it's followed by a low surrogate
         if (high >= 0xD800 && high <= 0xDBFF && scriptEnd < charLimit - 1)
         {
             UChar low = charArray[scriptEnd + 1];
             // if it is followed by a low surrogate,
             // consume it and form the full character
             if (low >= 0xDC00 && low <= 0xDFFF) {
                 ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
                 scriptEnd += 1;
             }
         }
         UScriptCode sc = uscript_getScript(ch, &error);
         int32_t pairIndex = getPairIndex(ch);
         // Paired character handling:
         //
         // if it's an open character, push it onto the stack.
         // if it's a close character, find the matching open on the
         // stack, and use that script code. Any non-matching open
         // characters above it on the stack will be poped.
         if (pairIndex >= 0) {
             if ((pairIndex & 1) == 0) {
                 parenStack[++parenSP].pairIndex = pairIndex;
                 parenStack[parenSP].scriptCode  = scriptCode;
             } else if (parenSP >= 0) {
                 int32_t pi = pairIndex & ~1;
                 while (parenSP >= 0 && parenStack[parenSP].pairIndex != pi) {
                     parenSP -= 1;
                 }
                 if (parenSP < startSP) {
                     startSP = parenSP;
                 }
                 if (parenSP >= 0) {
                     sc = parenStack[parenSP].scriptCode;
                 }
             }
         }
         if (sameScript(scriptCode, sc)) {
             if (scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
                 scriptCode = sc;
                 // now that we have a final script code, fix any open
                 // characters we pushed before we knew the script code.
                 while (startSP < parenSP) {
                     parenStack[++startSP].scriptCode = scriptCode;
                 }
             }
             // if this character is a close paired character,
             // pop it from the stack
             if (pairIndex >= 0 && (pairIndex & 1) != 0 && parenSP >= 0) {
                 parenSP -= 1;
                 startSP -= 1;
             }
         } else {
             // if the run broke on a surrogate pair,
             // end it before the high surrogate
             if (ch >= 0x10000) {
                 scriptEnd -= 1;
             }
             break;
         }
     }
     return true;
 }

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intl/icu/source/extra/scrptrun/scrptrun.cpp@129ffea94266 (annotated)

intl/icu/source/extra/scrptrun/scrptrun.cpp