The Tor Browser: gfx/skia/trunk/src/utils/SkTFitsIn.h@129ffea94266 (annotated)

gfx/skia/trunk/src/utils/SkTFitsIn.h@129ffea94266 (annotated)

gfx/skia/trunk/src/utils/SkTFitsIn.h

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 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkTFitsIn_DEFINED
 #define SkTFitsIn_DEFINED
 #include "SkTypes.h"
 #include "SkTLogic.h"
 #include <limits>
 namespace sktfitsin {
 namespace Private {
 /** SkTHasMoreDigits::type = (digits(A) >= digits(B)) ? SkTrue : SkFalse. */
 template<typename A, typename B> struct SkTHasMoreDigits {
     typedef SkTBool<std::numeric_limits<A>::digits >= std::numeric_limits<B>::digits> type;
 };
 /** A high or low side predicate which is used when it is statically known
  *  that source values are in the range of the Destination.
  */
 template <typename S> struct SkTOutOfRange_False {
     typedef SkFalse can_be_true;
     typedef S source_type;
     static bool apply(S s) {
         return false;
     }
 };
 /** A low side predicate which tests if the source value < Min(D).
  *  Assumes that Min(S) <= Min(D).
  */
 template <typename D, typename S> struct SkTOutOfRange_LT_MinD {
     typedef SkTrue can_be_true;
     typedef S source_type;
     static bool apply(S s) {
         typedef typename SkTHasMoreDigits<S, D>::type precondition;
         SK_COMPILE_ASSERT(precondition::value, SkTOutOfRange_LT_MinD__minS_gt_minD);
         return s < static_cast<S>((std::numeric_limits<D>::min)());
     }
 };
 /** A low side predicate which tests if the source value is less than 0. */
 template <typename D, typename S> struct SkTOutOfRange_LT_Zero {
     typedef SkTrue can_be_true;
     typedef S source_type;
     static bool apply(S s) {
         return s < static_cast<S>(0);
     }
 };
 /** A high side predicate which tests if the source value > Max(D).
  *  Assumes that Max(S) >= Max(D).
  */
 template <typename D, typename S> struct SkTOutOfRange_GT_MaxD {
     typedef SkTrue can_be_true;
     typedef S source_type;
     static bool apply(S s) {
         typedef typename SkTHasMoreDigits<S, D>::type precondition;
         SK_COMPILE_ASSERT(precondition::value, SkTOutOfRange_GT_MaxD__maxS_lt_maxD);
         return s > static_cast<S>((std::numeric_limits<D>::max)());
     }
 };
 /** Composes two SkTOutOfRange predicates.
  *  First checks OutOfRange_Low then, if in range, OutOfRange_High.
  */
 template<class OutOfRange_Low, class OutOfRange_High> struct SkTOutOfRange_Either {
     typedef SkTrue can_be_true;
     typedef typename OutOfRange_Low::source_type source_type;
     static bool apply(source_type s) {
         bool outOfRange = OutOfRange_Low::apply(s);
         if (!outOfRange) {
             outOfRange = OutOfRange_High::apply(s);
         }
         return outOfRange;
     }
 };
 /** SkTCombineOutOfRange::type is an SkTOutOfRange_XXX type which is the
  *  optimal combination of OutOfRange_Low and OutOfRange_High.
  */
 template<class OutOfRange_Low, class OutOfRange_High> struct SkTCombineOutOfRange {
     typedef SkTOutOfRange_Either<OutOfRange_Low, OutOfRange_High> Both;
     typedef SkTOutOfRange_False<typename OutOfRange_Low::source_type> Neither;
     typedef typename OutOfRange_Low::can_be_true apply_low;
     typedef typename OutOfRange_High::can_be_true apply_high;
     typedef typename SkTMux<apply_low, apply_high,
                             Both, OutOfRange_Low, OutOfRange_High, Neither>::type type;
 };
 template<typename D, typename S, class OutOfRange_Low, class OutOfRange_High>
 struct SkTRangeChecker {
     /** This is the method which is called at runtime to do the range check. */
     static bool OutOfRange(S s) {
         typedef typename SkTCombineOutOfRange<OutOfRange_Low, OutOfRange_High>::type Combined;
         return Combined::apply(s);
     }
 };
 /** SkTFitsIn_Unsigned2Unsiged::type is an SkTRangeChecker with an OutOfRange(S s) method
  *  the implementation of which is tailored for the source and destination types.
  *  Assumes that S and D are unsigned integer types.
  */
 template<typename D, typename S> struct SkTFitsIn_Unsigned2Unsiged {
     typedef SkTOutOfRange_False<S> OutOfRange_Low;
     typedef SkTOutOfRange_GT_MaxD<D, S> OutOfRange_High;
     typedef SkTRangeChecker<D, S, OutOfRange_Low, OutOfRange_High> HighSideOnlyCheck;
     typedef SkTRangeChecker<D, S, SkTOutOfRange_False<S>, SkTOutOfRange_False<S> > NoCheck;
     // If std::numeric_limits<D>::digits >= std::numeric_limits<S>::digits, nothing to check.
     // This also protects the precondition of SkTOutOfRange_GT_MaxD.
     typedef typename SkTHasMoreDigits<D, S>::type sourceFitsInDesitination;
     typedef typename SkTIf<sourceFitsInDesitination, NoCheck, HighSideOnlyCheck>::type type;
 };
 /** SkTFitsIn_Signed2Signed::type is an SkTRangeChecker with an OutOfRange(S s) method
  *  the implementation of which is tailored for the source and destination types.
  *  Assumes that S and D are signed integer types.
  */
 template<typename D, typename S> struct SkTFitsIn_Signed2Signed {
     typedef SkTOutOfRange_LT_MinD<D, S> OutOfRange_Low;
     typedef SkTOutOfRange_GT_MaxD<D, S> OutOfRange_High;
     typedef SkTRangeChecker<D, S, OutOfRange_Low, OutOfRange_High> FullCheck;
     typedef SkTRangeChecker<D, S, SkTOutOfRange_False<S>, SkTOutOfRange_False<S> > NoCheck;
     // If std::numeric_limits<D>::digits >= std::numeric_limits<S>::digits, nothing to check.
     // This also protects the precondition of SkTOutOfRange_LT_MinD and SkTOutOfRange_GT_MaxD.
     typedef typename SkTHasMoreDigits<D, S>::type sourceFitsInDesitination;
     typedef typename SkTIf<sourceFitsInDesitination, NoCheck, FullCheck>::type type;
 };
 /** SkTFitsIn_Signed2Unsigned::type is an SkTRangeChecker with an OutOfRange(S s) method
  *  the implementation of which is tailored for the source and destination types.
  *  Assumes that S is a signed integer type and D is an unsigned integer type.
  */
 template<typename D, typename S> struct SkTFitsIn_Signed2Unsigned {
     typedef SkTOutOfRange_LT_Zero<D, S> OutOfRange_Low;
     typedef SkTOutOfRange_GT_MaxD<D, S> OutOfRange_High;
     typedef SkTRangeChecker<D, S, OutOfRange_Low, OutOfRange_High> FullCheck;
     typedef SkTRangeChecker<D, S, OutOfRange_Low, SkTOutOfRange_False<S> > LowSideOnlyCheck;
     // If std::numeric_limits<D>::max() >= std::numeric_limits<S>::max(),
     // no need to check the high side. (Until C++11, assume more digits means greater max.)
     // This also protects the precondition of SkTOutOfRange_GT_MaxD.
     typedef typename SkTHasMoreDigits<D, S>::type sourceCannotExceedDesitination;
     typedef typename SkTIf<sourceCannotExceedDesitination, LowSideOnlyCheck, FullCheck>::type type;
 };
 /** SkTFitsIn_Unsigned2Signed::type is an SkTRangeChecker with an OutOfRange(S s) method
  *  the implementation of which is tailored for the source and destination types.
  *  Assumes that S is an usigned integer type and D is a signed integer type.
  */
 template<typename D, typename S> struct SkTFitsIn_Unsigned2Signed {
     typedef SkTOutOfRange_False<S> OutOfRange_Low;
     typedef SkTOutOfRange_GT_MaxD<D, S> OutOfRange_High;
     typedef SkTRangeChecker<D, S, OutOfRange_Low, OutOfRange_High> HighSideOnlyCheck;
     typedef SkTRangeChecker<D, S, SkTOutOfRange_False<S>, SkTOutOfRange_False<S> > NoCheck;
     // If std::numeric_limits<D>::max() >= std::numeric_limits<S>::max(), nothing to check.
     // (Until C++11, assume more digits means greater max.)
     // This also protects the precondition of SkTOutOfRange_GT_MaxD.
     typedef typename SkTHasMoreDigits<D, S>::type sourceCannotExceedDesitination;
     typedef typename SkTIf<sourceCannotExceedDesitination, NoCheck, HighSideOnlyCheck>::type type;
 };
 /** SkTFitsIn::type is an SkTRangeChecker with an OutOfRange(S s) method
  *  the implementation of which is tailored for the source and destination types.
  *  Assumes that S and D are integer types.
  */
 template<typename D, typename S> struct SkTFitsIn {
     // One of the following will be the 'selector' type.
     typedef SkTFitsIn_Signed2Signed<D, S> S2S;
     typedef SkTFitsIn_Signed2Unsigned<D, S> S2U;
     typedef SkTFitsIn_Unsigned2Signed<D, S> U2S;
     typedef SkTFitsIn_Unsigned2Unsiged<D, S> U2U;
     typedef SkTBool<std::numeric_limits<S>::is_signed> S_is_signed;
     typedef SkTBool<std::numeric_limits<D>::is_signed> D_is_signed;
     typedef typename SkTMux<S_is_signed, D_is_signed, S2S, S2U, U2S, U2U>::type selector;
     // This type is an SkTRangeChecker.
     typedef typename selector::type type;
 };
 } // namespace Private
 } // namespace sktfitsin
 /** Returns true if the integer source value 's' will fit in the integer destination type 'D'. */
 template <typename D, typename S> inline bool SkTFitsIn(S s) {
     SK_COMPILE_ASSERT(std::numeric_limits<S>::is_integer, SkTFitsIn_source_must_be_integer);
     SK_COMPILE_ASSERT(std::numeric_limits<D>::is_integer, SkTFitsIn_destination_must_be_integer);
     return !sktfitsin::Private::SkTFitsIn<D, S>::type::OutOfRange(s);
 }
 #endif

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gfx/skia/trunk/src/utils/SkTFitsIn.h@129ffea94266 (annotated)

gfx/skia/trunk/src/utils/SkTFitsIn.h