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Diffstat (limited to 'third_party/protobuf/python/google/protobuf/pyext/safe_numerics.h')
| -rw-r--r-- | third_party/protobuf/python/google/protobuf/pyext/safe_numerics.h | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/third_party/protobuf/python/google/protobuf/pyext/safe_numerics.h b/third_party/protobuf/python/google/protobuf/pyext/safe_numerics.h deleted file mode 100644 index 639ba2c8e3..0000000000 --- a/third_party/protobuf/python/google/protobuf/pyext/safe_numerics.h +++ /dev/null @@ -1,164 +0,0 @@ -// Protocol Buffers - Google's data interchange format -// Copyright 2008 Google Inc. All rights reserved. -// https://developers.google.com/protocol-buffers/ -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_SAFE_NUMERICS_H__ -#define GOOGLE_PROTOBUF_PYTHON_CPP_SAFE_NUMERICS_H__ -// Copied from chromium with only changes to the namespace. - -#include <limits> - -#include <google/protobuf/stubs/logging.h> -#include <google/protobuf/stubs/common.h> - -namespace google { -namespace protobuf { -namespace python { - -template <bool SameSize, bool DestLarger, - bool DestIsSigned, bool SourceIsSigned> -struct IsValidNumericCastImpl; - -#define BASE_NUMERIC_CAST_CASE_SPECIALIZATION(A, B, C, D, Code) \ -template <> struct IsValidNumericCastImpl<A, B, C, D> { \ - template <class Source, class DestBounds> static inline bool Test( \ - Source source, DestBounds min, DestBounds max) { \ - return Code; \ - } \ -} - -#define BASE_NUMERIC_CAST_CASE_SAME_SIZE(DestSigned, SourceSigned, Code) \ - BASE_NUMERIC_CAST_CASE_SPECIALIZATION( \ - true, true, DestSigned, SourceSigned, Code); \ - BASE_NUMERIC_CAST_CASE_SPECIALIZATION( \ - true, false, DestSigned, SourceSigned, Code) - -#define BASE_NUMERIC_CAST_CASE_SOURCE_LARGER(DestSigned, SourceSigned, Code) \ - BASE_NUMERIC_CAST_CASE_SPECIALIZATION( \ - false, false, DestSigned, SourceSigned, Code); \ - -#define BASE_NUMERIC_CAST_CASE_DEST_LARGER(DestSigned, SourceSigned, Code) \ - BASE_NUMERIC_CAST_CASE_SPECIALIZATION( \ - false, true, DestSigned, SourceSigned, Code); \ - -// The three top level cases are: -// - Same size -// - Source larger -// - Dest larger -// And for each of those three cases, we handle the 4 different possibilities -// of signed and unsigned. This gives 12 cases to handle, which we enumerate -// below. -// -// The last argument in each of the macros is the actual comparison code. It -// has three arguments available, source (the value), and min/max which are -// the ranges of the destination. - - -// These are the cases where both types have the same size. - -// Both signed. -BASE_NUMERIC_CAST_CASE_SAME_SIZE(true, true, true); -// Both unsigned. -BASE_NUMERIC_CAST_CASE_SAME_SIZE(false, false, true); -// Dest unsigned, Source signed. -BASE_NUMERIC_CAST_CASE_SAME_SIZE(false, true, source >= 0); -// Dest signed, Source unsigned. -// This cast is OK because Dest's max must be less than Source's. -BASE_NUMERIC_CAST_CASE_SAME_SIZE(true, false, - source <= static_cast<Source>(max)); - - -// These are the cases where Source is larger. - -// Both unsigned. -BASE_NUMERIC_CAST_CASE_SOURCE_LARGER(false, false, source <= max); -// Both signed. -BASE_NUMERIC_CAST_CASE_SOURCE_LARGER(true, true, - source >= min && source <= max); -// Dest is unsigned, Source is signed. -BASE_NUMERIC_CAST_CASE_SOURCE_LARGER(false, true, - source >= 0 && source <= max); -// Dest is signed, Source is unsigned. -// This cast is OK because Dest's max must be less than Source's. -BASE_NUMERIC_CAST_CASE_SOURCE_LARGER(true, false, - source <= static_cast<Source>(max)); - - -// These are the cases where Dest is larger. - -// Both unsigned. -BASE_NUMERIC_CAST_CASE_DEST_LARGER(false, false, true); -// Both signed. -BASE_NUMERIC_CAST_CASE_DEST_LARGER(true, true, true); -// Dest is unsigned, Source is signed. -BASE_NUMERIC_CAST_CASE_DEST_LARGER(false, true, source >= 0); -// Dest is signed, Source is unsigned. -BASE_NUMERIC_CAST_CASE_DEST_LARGER(true, false, true); - -#undef BASE_NUMERIC_CAST_CASE_SPECIALIZATION -#undef BASE_NUMERIC_CAST_CASE_SAME_SIZE -#undef BASE_NUMERIC_CAST_CASE_SOURCE_LARGER -#undef BASE_NUMERIC_CAST_CASE_DEST_LARGER - - -// The main test for whether the conversion will under or overflow. -template <class Dest, class Source> -inline bool IsValidNumericCast(Source source) { - typedef std::numeric_limits<Source> SourceLimits; - typedef std::numeric_limits<Dest> DestLimits; - GOOGLE_COMPILE_ASSERT(SourceLimits::is_specialized, argument_must_be_numeric); - GOOGLE_COMPILE_ASSERT(SourceLimits::is_integer, argument_must_be_integral); - GOOGLE_COMPILE_ASSERT(DestLimits::is_specialized, result_must_be_numeric); - GOOGLE_COMPILE_ASSERT(DestLimits::is_integer, result_must_be_integral); - - return IsValidNumericCastImpl< - sizeof(Dest) == sizeof(Source), - (sizeof(Dest) > sizeof(Source)), - DestLimits::is_signed, - SourceLimits::is_signed>::Test( - source, - DestLimits::min(), - DestLimits::max()); -} - -// checked_numeric_cast<> is analogous to static_cast<> for numeric types, -// except that it CHECKs that the specified numeric conversion will not -// overflow or underflow. Floating point arguments are not currently allowed -// (this is COMPILE_ASSERTd), though this could be supported if necessary. -template <class Dest, class Source> -inline Dest checked_numeric_cast(Source source) { - GOOGLE_CHECK(IsValidNumericCast<Dest>(source)); - return static_cast<Dest>(source); -} - -} // namespace python -} // namespace protobuf - -} // namespace google -#endif // GOOGLE_PROTOBUF_PYTHON_CPP_SAFE_NUMERICS_H__ |