158 lines
7.7 KiB
C++
158 lines
7.7 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
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#define BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "base/base_export.h"
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#include "base/containers/span.h"
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#include "base/strings/string16.h"
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#include "base/strings/string_piece.h"
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#include "build/build_config.h"
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// ----------------------------------------------------------------------------
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// IMPORTANT MESSAGE FROM YOUR SPONSOR
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//
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// This file contains no "wstring" variants. New code should use string16. If
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// you need to make old code work, use the UTF8 version and convert. Please do
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// not add wstring variants.
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//
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// Please do not add "convenience" functions for converting strings to integers
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// that return the value and ignore success/failure. That encourages people to
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// write code that doesn't properly handle the error conditions.
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//
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// DO NOT use these functions in any UI unless it's NOT localized on purpose.
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// Instead, use base::MessageFormatter for a complex message with numbers
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// (integer, float, double) embedded or base::Format{Number,Double,Percent} to
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// just format a single number/percent. Note that some languages use native
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// digits instead of ASCII digits while others use a group separator or decimal
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// point different from ',' and '.'. Using these functions in the UI would lead
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// numbers to be formatted in a non-native way.
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// ----------------------------------------------------------------------------
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namespace base {
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// Number -> string conversions ------------------------------------------------
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// Ignores locale! see warning above.
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BASE_EXPORT std::string NumberToString(int value);
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BASE_EXPORT string16 NumberToString16(int value);
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BASE_EXPORT std::string NumberToString(unsigned int value);
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BASE_EXPORT string16 NumberToString16(unsigned int value);
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BASE_EXPORT std::string NumberToString(long value);
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BASE_EXPORT string16 NumberToString16(long value);
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BASE_EXPORT std::string NumberToString(unsigned long value);
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BASE_EXPORT string16 NumberToString16(unsigned long value);
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BASE_EXPORT std::string NumberToString(long long value);
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BASE_EXPORT string16 NumberToString16(long long value);
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BASE_EXPORT std::string NumberToString(unsigned long long value);
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BASE_EXPORT string16 NumberToString16(unsigned long long value);
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BASE_EXPORT std::string NumberToString(double value);
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BASE_EXPORT string16 NumberToString16(double value);
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// String -> number conversions ------------------------------------------------
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// Perform a best-effort conversion of the input string to a numeric type,
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// setting |*output| to the result of the conversion. Returns true for
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// "perfect" conversions; returns false in the following cases:
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// - Overflow. |*output| will be set to the maximum value supported
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// by the data type.
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// - Underflow. |*output| will be set to the minimum value supported
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// by the data type.
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// - Trailing characters in the string after parsing the number. |*output|
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// will be set to the value of the number that was parsed.
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// - Leading whitespace in the string before parsing the number. |*output| will
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// be set to the value of the number that was parsed.
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// - No characters parseable as a number at the beginning of the string.
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// |*output| will be set to 0.
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// - Empty string. |*output| will be set to 0.
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// WARNING: Will write to |output| even when returning false.
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// Read the comments above carefully.
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BASE_EXPORT bool StringToInt(StringPiece input, int* output);
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BASE_EXPORT bool StringToInt(StringPiece16 input, int* output);
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BASE_EXPORT bool StringToUint(StringPiece input, unsigned* output);
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BASE_EXPORT bool StringToUint(StringPiece16 input, unsigned* output);
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BASE_EXPORT bool StringToInt64(StringPiece input, int64_t* output);
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BASE_EXPORT bool StringToInt64(StringPiece16 input, int64_t* output);
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BASE_EXPORT bool StringToUint64(StringPiece input, uint64_t* output);
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BASE_EXPORT bool StringToUint64(StringPiece16 input, uint64_t* output);
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BASE_EXPORT bool StringToSizeT(StringPiece input, size_t* output);
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BASE_EXPORT bool StringToSizeT(StringPiece16 input, size_t* output);
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// For floating-point conversions, only conversions of input strings in decimal
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// form are defined to work. Behavior with strings representing floating-point
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// numbers in hexadecimal, and strings representing non-finite values (such as
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// NaN and inf) is undefined. Otherwise, these behave the same as the integral
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// variants. This expects the input string to NOT be specific to the locale.
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// If your input is locale specific, use ICU to read the number.
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// WARNING: Will write to |output| even when returning false.
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// Read the comments here and above StringToInt() carefully.
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BASE_EXPORT bool StringToDouble(StringPiece input, double* output);
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BASE_EXPORT bool StringToDouble(StringPiece16 input, double* output);
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// Hex encoding ----------------------------------------------------------------
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// Returns a hex string representation of a binary buffer. The returned hex
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// string will be in upper case. This function does not check if |size| is
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// within reasonable limits since it's written with trusted data in mind. If
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// you suspect that the data you want to format might be large, the absolute
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// max size for |size| should be is
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// std::numeric_limits<size_t>::max() / 2
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BASE_EXPORT std::string HexEncode(const void* bytes, size_t size);
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BASE_EXPORT std::string HexEncode(base::span<const uint8_t> bytes);
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// Best effort conversion, see StringToInt above for restrictions.
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// Will only successful parse hex values that will fit into |output|, i.e.
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// -0x80000000 < |input| < 0x7FFFFFFF.
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BASE_EXPORT bool HexStringToInt(StringPiece input, int* output);
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// Best effort conversion, see StringToInt above for restrictions.
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// Will only successful parse hex values that will fit into |output|, i.e.
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// 0x00000000 < |input| < 0xFFFFFFFF.
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// The string is not required to start with 0x.
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BASE_EXPORT bool HexStringToUInt(StringPiece input, uint32_t* output);
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// Best effort conversion, see StringToInt above for restrictions.
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// Will only successful parse hex values that will fit into |output|, i.e.
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// -0x8000000000000000 < |input| < 0x7FFFFFFFFFFFFFFF.
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BASE_EXPORT bool HexStringToInt64(StringPiece input, int64_t* output);
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// Best effort conversion, see StringToInt above for restrictions.
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// Will only successful parse hex values that will fit into |output|, i.e.
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// 0x0000000000000000 < |input| < 0xFFFFFFFFFFFFFFFF.
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// The string is not required to start with 0x.
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BASE_EXPORT bool HexStringToUInt64(StringPiece input, uint64_t* output);
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// Similar to the previous functions, except that output is a vector of bytes.
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// |*output| will contain as many bytes as were successfully parsed prior to the
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// error. There is no overflow, but input.size() must be evenly divisible by 2.
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// Leading 0x or +/- are not allowed.
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BASE_EXPORT bool HexStringToBytes(StringPiece input,
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std::vector<uint8_t>* output);
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// Same as HexStringToBytes, but for an std::string.
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BASE_EXPORT bool HexStringToString(StringPiece input, std::string* output);
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// Decodes the hex string |input| into a presized |output|. The output buffer
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// must be sized exactly to |input.size() / 2| or decoding will fail and no
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// bytes will be written to |output|. Decoding an empty input is also
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// considered a failure. When decoding fails due to encountering invalid input
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// characters, |output| will have been filled with the decoded bytes up until
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// the failure.
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BASE_EXPORT bool HexStringToSpan(StringPiece input, base::span<uint8_t> output);
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} // namespace base
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#endif // BASE_STRINGS_STRING_NUMBER_CONVERSIONS_H_
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