diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/utils/safeint.h')
-rw-r--r-- | comm/third_party/botan/src/lib/utils/safeint.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/utils/safeint.h b/comm/third_party/botan/src/lib/utils/safeint.h new file mode 100644 index 0000000000..5c9ea49553 --- /dev/null +++ b/comm/third_party/botan/src/lib/utils/safeint.h @@ -0,0 +1,41 @@ +/* +* Safe(r) Integer Handling +* (C) 2016 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_UTILS_SAFE_INT_H_ +#define BOTAN_UTILS_SAFE_INT_H_ + +#include <botan/exceptn.h> +#include <string> + +namespace Botan { + +class BOTAN_PUBLIC_API(2,0) Integer_Overflow_Detected final : public Exception + { + public: + Integer_Overflow_Detected(const std::string& file, int line) : + Exception("Integer overflow detected at " + file + ":" + std::to_string(line)) + {} + + ErrorType error_type() const noexcept override { return ErrorType::InternalError; } + }; + +inline size_t checked_add(size_t x, size_t y, const char* file, int line) + { + // TODO: use __builtin_x_overflow on GCC and Clang + size_t z = x + y; + if(z < x) + { + throw Integer_Overflow_Detected(file, line); + } + return z; + } + +#define BOTAN_CHECKED_ADD(x,y) checked_add(x,y,__FILE__,__LINE__) + +} + +#endif |