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authorTom Sepez <tsepez@chromium.org>2015-02-05 09:46:23 -0800
committerTom Sepez <tsepez@chromium.org>2015-02-05 09:46:23 -0800
commitdabc5d57bf473708295800a7991bc1fafdf76288 (patch)
tree9dfb8313596dd61e2c600cf02548b191f9753daf /third_party/base/numerics/safe_conversions.h
parent7061d1af45752617fafa85e2242dc5b2844650b5 (diff)
downloadpdfium-dabc5d57bf473708295800a7991bc1fafdf76288.tar.xz
Add namespace and-re-arrange PDFium's local copy of chromium /base.
Any projects DEPS'd into chromium and requiring a /base subset should have a local copy of that subset in a separate namespace. This will avoid future naming conflicts. Re-arrange the directory structure to better identify what came from chromium's base, and to make drop-in replacement easier for files that contain hard-coded "base/" in their #include directives. R=jam@chromium.org Review URL: https://codereview.chromium.org/900753002
Diffstat (limited to 'third_party/base/numerics/safe_conversions.h')
-rw-r--r--third_party/base/numerics/safe_conversions.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/base/numerics/safe_conversions.h b/third_party/base/numerics/safe_conversions.h
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+++ 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_
+