| // Copyright (c) 2012 The Chromium OS 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 CHROMIUMOS_WIDE_PROFILING_BINARY_DATA_UTILS_H_ |
| #define CHROMIUMOS_WIDE_PROFILING_BINARY_DATA_UTILS_H_ |
| |
| #include <byteswap.h> |
| #include <limits.h> |
| #include <stdint.h> |
| |
| #include <bitset> |
| #include <type_traits> |
| #include <vector> |
| |
| #include "base/logging.h" |
| |
| #include "chromiumos-wide-profiling/compat/string.h" |
| #include "chromiumos-wide-profiling/kernel/perf_internals.h" |
| |
| namespace quipper { |
| |
| // Swaps the byte order of 16-bit, 32-bit, and 64-bit unsigned integers. |
| template <class T> |
| void ByteSwap(T* input) { |
| switch (sizeof(T)) { |
| case sizeof(uint8_t): |
| LOG(WARNING) << "Attempting to byte swap on a single byte."; |
| break; |
| case sizeof(uint16_t): |
| *input = bswap_16(*input); |
| break; |
| case sizeof(uint32_t): |
| *input = bswap_32(*input); |
| break; |
| case sizeof(uint64_t): |
| *input = bswap_64(*input); |
| break; |
| default: |
| LOG(FATAL) << "Invalid size for byte swap: " << sizeof(T) << " bytes"; |
| break; |
| } |
| } |
| |
| // Swaps byte order of |value| if the |swap| flag is set. This function is |
| // trivial but it avoids filling code with "if (swap) { ... } " statements. |
| template <typename T> |
| T MaybeSwap(T value, bool swap) { |
| if (swap) |
| ByteSwap(&value); |
| return value; |
| } |
| |
| // Returns the number of bits in a numerical value. |
| template <typename T> |
| size_t GetNumBits(const T& value) { |
| return std::bitset<sizeof(T) * CHAR_BIT>(value).count(); |
| } |
| |
| // Returns the leading 64 bits of the MD5 digest of |input|. |
| uint64_t Md5Prefix(const string& input); |
| uint64_t Md5Prefix(const std::vector<char>& input); |
| |
| // Returns a string that represents |array| in hexadecimal. |
| string RawDataToHexString(const u8* array, size_t length); |
| |
| // Given raw data in |str|, returns a string that represents the binary data as |
| // hexadecimal. |
| string RawDataToHexString(const string& str); |
| |
| // Given a string |str| containing data represented in hexadecimal, converts to |
| // to raw bytes stored in |array|. Returns true on success. Only stores up to |
| // |length| bytes - if there are more characters in the string, they are |
| // ignored (but the function may still return true). |
| bool HexStringToRawData(const string& str, u8* array, size_t length); |
| |
| // Round |value| up to the next |alignment|. I.e. returns the smallest multiple |
| // of |alignment| less than or equal to |value|. |alignment| must be a power |
| // of 2 (compile-time enforced). |
| template<unsigned int alignment, |
| typename std::enable_if< |
| alignment != 0 && (alignment&(alignment-1)) == 0 |
| >::type* = nullptr> |
| inline uint64_t Align(uint64_t value) { |
| constexpr uint64_t mask = alignment - 1; |
| return (value + mask) & ~mask; |
| } |
| |
| // Allows passing a type parameter instead of a size. |
| template<typename T> |
| inline uint64_t Align(uint64_t value) { |
| return Align<sizeof(T)>(value); |
| } |
| |
| } // namespace quipper |
| |
| #endif // CHROMIUMOS_WIDE_PROFILING_BINARY_DATA_UTILS_H_ |