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83 lines
3.4 KiB
C++
83 lines
3.4 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <thirdparty/protobuf/io/strtod.h>
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#include <cstdio>
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#include <cstring>
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#include <limits>
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#include <string>
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#include <thirdparty/protobuf/stubs/logging.h>
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#include <thirdparty/protobuf/stubs/common.h>
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#include <thirdparty/protobuf/stubs/strutil.h>
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namespace google {
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namespace protobuf {
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namespace io {
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// This approximately 0x1.ffffffp127, but we don't use 0x1.ffffffp127 because
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// it won't compile in MSVC.
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const double MAX_FLOAT_AS_DOUBLE_ROUNDED = 3.4028235677973366e+38;
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float SafeDoubleToFloat(double value) {
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// static_cast<float> on a number larger than float can result in illegal
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// instruction error, so we need to manually convert it to infinity or max.
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if (value > std::numeric_limits<float>::max()) {
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// Max float value is about 3.4028234664E38 when represented as a double.
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// However, when printing float as text, it will be rounded as
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// 3.4028235e+38. If we parse the value of 3.4028235e+38 from text and
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// compare it to 3.4028234664E38, we may think that it is larger, but
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// actually, any number between these two numbers could only be represented
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// as the same max float number in float, so we should treat them the same
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// as max float.
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if (value <= MAX_FLOAT_AS_DOUBLE_ROUNDED) {
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return std::numeric_limits<float>::max();
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}
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return std::numeric_limits<float>::infinity();
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} else if (value < -std::numeric_limits<float>::max()) {
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if (value >= -MAX_FLOAT_AS_DOUBLE_ROUNDED) {
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return -std::numeric_limits<float>::max();
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}
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return -std::numeric_limits<float>::infinity();
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} else {
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return static_cast<float>(value);
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}
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}
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double NoLocaleStrtod(const char* str, char** endptr) {
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return google::protobuf::internal::NoLocaleStrtod(str, endptr);
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}
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} // namespace io
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} // namespace protobuf
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} // namespace google
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