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authorTom Sepez <tsepez@chromium.org>2015-02-05 10:03:18 -0800
committerTom Sepez <tsepez@chromium.org>2015-02-05 10:03:18 -0800
commit35425896b07b5124651c249d6ce29285cf71ea3b (patch)
tree0cd30ec338fffdebb3aee6a899beeb3835c6f194 /third_party/base/numerics/safe_conversions.h
parent53476d6956781ceb252e1ae5e01f83a48bcb4908 (diff)
downloadpdfium-35425896b07b5124651c249d6ce29285cf71ea3b.tar.xz
Merge to XFA: Add namespace and-re-arrange PDFium's local copy of /base.
Original revieww URL: https://codereview.chromium.org/900753002 TBR=jam@chromium.org Review URL: https://codereview.chromium.org/880603004
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diff --git a/third_party/base/numerics/safe_conversions.h b/third_party/base/numerics/safe_conversions.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PDFIUM_THIRD_PARTY_BASE_SAFE_CONVERSIONS_H_
+#define PDFIUM_THIRD_PARTY_BASE_SAFE_CONVERSIONS_H_
+
+#include <limits>
+
+#include "../logging.h"
+#include "safe_conversions_impl.h"
+
+namespace pdfium {
+namespace base {
+
+// Convenience function that returns true if the supplied value is in range
+// for the destination type.
+template <typename Dst, typename Src>
+inline bool IsValueInRangeForNumericType(Src value) {
+ return internal::DstRangeRelationToSrcRange<Dst>(value) ==
+ internal::RANGE_VALID;
+}
+
+// checked_cast<> is analogous to static_cast<> for numeric types,
+// except that it CHECKs that the specified numeric conversion will not
+// overflow or underflow. NaN source will always trigger a CHECK.
+template <typename Dst, typename Src>
+inline Dst checked_cast(Src value) {
+ CHECK(IsValueInRangeForNumericType<Dst>(value));
+ return static_cast<Dst>(value);
+}
+
+// saturated_cast<> is analogous to static_cast<> for numeric types, except
+// that the specified numeric conversion will saturate rather than overflow or
+// underflow. NaN assignment to an integral will trigger a CHECK condition.
+template <typename Dst, typename Src>
+inline Dst saturated_cast(Src value) {
+ // Optimization for floating point values, which already saturate.
+ if (std::numeric_limits<Dst>::is_iec559)
+ return static_cast<Dst>(value);
+
+ switch (internal::DstRangeRelationToSrcRange<Dst>(value)) {
+ case internal::RANGE_VALID:
+ return static_cast<Dst>(value);
+
+ case internal::RANGE_UNDERFLOW:
+ return std::numeric_limits<Dst>::min();
+
+ case internal::RANGE_OVERFLOW:
+ return std::numeric_limits<Dst>::max();
+
+ // Should fail only on attempting to assign NaN to a saturated integer.
+ case internal::RANGE_INVALID:
+ CHECK(false);
+ return std::numeric_limits<Dst>::max();
+ }
+
+ NOTREACHED();
+ return static_cast<Dst>(value);
+}
+
+} // namespace base
+} // namespace pdfium
+
+#endif // PDFIUM_THIRD_PARTY_BASE_SAFE_CONVERSIONS_H_
+