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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_STRING_ENCODE_H_
#define RTC_BASE_STRING_ENCODE_H_
#include <stddef.h>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/string_to_number.h"
namespace rtc {
//////////////////////////////////////////////////////////////////////
// String Encoding Utilities
//////////////////////////////////////////////////////////////////////
std::string hex_encode(absl::string_view str);
std::string hex_encode_with_delimiter(absl::string_view source, char delimiter);
// hex_decode converts ascii hex to binary.
size_t hex_decode(ArrayView<char> buffer, absl::string_view source);
// hex_decode, assuming that there is a delimiter between every byte
// pair.
// `delimiter` == 0 means no delimiter
// If the buffer is too short or the data is invalid, we return 0.
size_t hex_decode_with_delimiter(ArrayView<char> buffer,
absl::string_view source,
char delimiter);
// Splits the source string into multiple fields separated by delimiter,
// with duplicates of delimiter creating empty fields. Empty input produces a
// single, empty, field.
std::vector<absl::string_view> split(absl::string_view source, char delimiter);
// Splits the source string into multiple fields separated by delimiter,
// with duplicates of delimiter ignored. Trailing delimiter ignored.
size_t tokenize(absl::string_view source,
char delimiter,
std::vector<std::string>* fields);
// Extract the first token from source as separated by delimiter, with
// duplicates of delimiter ignored. Return false if the delimiter could not be
// found, otherwise return true.
bool tokenize_first(absl::string_view source,
char delimiter,
std::string* token,
std::string* rest);
template <typename T,
typename std::enable_if<
!std::is_pointer<T>::value ||
std::is_convertible<T, const char*>::value>::type* = nullptr>
std::string ToString(T value) {
return {absl::StrCat(value)};
}
// Versions that behave differently from StrCat
template <>
std::string ToString(bool b);
// Versions not supported by StrCat:
template <>
std::string ToString(long double t);
template <typename T,
typename std::enable_if<
std::is_pointer<T>::value &&
!std::is_convertible<T, const char*>::value>::type* = nullptr>
std::string ToString(T p) {
char buf[32];
const int len = std::snprintf(&buf[0], std::size(buf), "%p", p);
RTC_DCHECK_LE(len, std::size(buf));
return std::string(&buf[0], len);
}
template <typename T,
typename std::enable_if<std::is_arithmetic<T>::value &&
!std::is_same<T, bool>::value,
int>::type = 0>
static bool FromString(absl::string_view s, T* t) {
RTC_DCHECK(t);
std::optional<T> result = webrtc::StringToNumber<T>(s);
if (result)
*t = *result;
return result.has_value();
}
bool FromString(absl::string_view s, bool* b);
template <typename T>
static inline T FromString(absl::string_view str) {
T val;
FromString(str, &val);
return val;
}
//////////////////////////////////////////////////////////////////////
} // namespace rtc
#endif // RTC_BASE_STRING_ENCODE_H__
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