Move the number conversions from string_util to a new file....

base/string_number_conversions.h

+// Copyright (c) 2010 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 BASE_STRING_NUMBER_CONVERSIONS_H_
+#define BASE_STRING_NUMBER_CONVERSIONS_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+
+// ----------------------------------------------------------------------------
+// IMPORTANT MESSAGE FROM YOUR SPONSOR
+//
+// This file contains no "wstring" variants. New code should use string16. If
+// you need to make old code work, use the UTF8 version and convert. Please do
+// not add wstring variants.
+//
+// Please do not add "convenience" functions for converting strings to integers
+// that return the value and ignore success/failure. That encourages people to
+// write code that doesn't properly handle the error conditions.
+// ----------------------------------------------------------------------------
+
+namespace base {
+
+// Number -> string conversions ------------------------------------------------
+
+std::string IntToString(int value);
+string16 IntToString16(int value);
+
+std::string UintToString(unsigned value);
+string16 UintToString16(unsigned value);
+
+std::string Int64ToString(int64 value);
+string16 Int64ToString16(int64 value);
+
+std::string Uint64ToString(uint64 value);
+string16 Uint64ToString16(uint64 value);
+
+// DoubleToString converts the double to a string format that ignores the
+// locale. If you want to use locale specific formatting, use ICU.
+std::string DoubleToString(double value);
+
+// String -> number conversions ------------------------------------------------
+
+// Perform a best-effort conversion of the input string to a numeric type,
+// setting |*output| to the result of the conversion.  Returns true for
+// "perfect" conversions; returns false in the following cases:
+//  - Overflow/underflow.  |*output| will be set to the maximum value supported
+//    by the data type.
+//  - Trailing characters in the string after parsing the number.  |*output|
+//    will be set to the value of the number that was parsed.
+//  - No characters parseable as a number at the beginning of the string.
+//    |*output| will be set to 0.
+//  - Empty string.  |*output| will be set to 0.
+bool StringToInt(const std::string& input, int* output);
+bool StringToInt(const string16& input, int* output);
+bool StringToInt64(const std::string& input, int64* output);
+bool StringToInt64(const string16& input, int64* output);
+
+// For floating-point conversions, only conversions of input strings in decimal
+// form are defined to work.  Behavior with strings representing floating-point
+// numbers in hexadecimal, and strings representing non-fininte values (such as
+// NaN and inf) is undefined.  Otherwise, these behave the same as the integral
+// variants.  This expects the input string to NOT be specific to the locale.
+// If your input is locale specific, use ICU to read the number.
+bool StringToDouble(const std::string& input, double* output);
+
+// Hex encoding ----------------------------------------------------------------
+
+// Returns a hex string representation of a binary buffer. The returned hex
+// string will be in upper case. This function does not check if |size| is
+// within reasonable limits since it's written with trusted data in mind.  If
+// you suspect that the data you want to format might be large, the absolute
+// max size for |size| should be is
+//   std::numeric_limits<size_t>::max() / 2
+std::string HexEncode(const void* bytes, size_t size);
+
+// Best effort conversion, see StringToInt above for restrictions.
+bool HexStringToInt(const std::string& input, int* output);
+
+// Similar to the previous functions, except that output is a vector of bytes.
+// |*output| will contain as many bytes as were successfully parsed prior to the
+// error.  There is no overflow, but input.size() must be evenly divisible by 2.
+// Leading 0x or +/- are not allowed.
+bool HexStringToBytes(const std::string& input, std::vector<uint8>* output);
+
+}  // namespace base
+
+#endif  // BASE_STRING_NUMBER_CONVERSIONS_H_