205 lines
6.4 KiB
C++
205 lines
6.4 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_STRINGENCODE_H_
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#define RTC_BASE_STRINGENCODE_H_
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#include <stddef.h>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include "absl/types/optional.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/string_to_number.h"
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namespace rtc
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{
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//////////////////////////////////////////////////////////////////////
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// String Encoding Utilities
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//////////////////////////////////////////////////////////////////////
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// Note: in-place decoding (buffer == source) is allowed.
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size_t url_decode(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen);
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// Convert an unsigned value from 0 to 15 to the hex character equivalent...
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char hex_encode(unsigned char val);
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// ...and vice-versa.
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bool hex_decode(char ch, unsigned char* val);
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// hex_encode shows the hex representation of binary data in ascii.
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size_t hex_encode(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen);
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// hex_encode, but separate each byte representation with a delimiter.
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// |delimiter| == 0 means no delimiter
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// If the buffer is too short, we return 0
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size_t hex_encode_with_delimiter(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen,
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char delimiter);
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// Helper functions for hex_encode.
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std::string hex_encode(const std::string& str);
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std::string hex_encode(const char* source, size_t srclen);
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std::string hex_encode_with_delimiter(const char* source,
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size_t srclen,
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char delimiter);
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// hex_decode converts ascii hex to binary.
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size_t hex_decode(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen);
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// hex_decode, assuming that there is a delimiter between every byte
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// pair.
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// |delimiter| == 0 means no delimiter
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// If the buffer is too short or the data is invalid, we return 0.
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size_t hex_decode_with_delimiter(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen,
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char delimiter);
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// Helper functions for hex_decode.
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size_t hex_decode(char* buffer, size_t buflen, const std::string& source);
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size_t hex_decode_with_delimiter(char* buffer,
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size_t buflen,
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const std::string& source,
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char delimiter);
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// Apply any suitable string transform (including the ones above) to an STL
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// string. Stack-allocated temporary space is used for the transformation,
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// so value and source may refer to the same string.
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typedef size_t (*Transform)(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen);
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size_t transform(std::string& value,
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size_t maxlen,
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const std::string& source,
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Transform t);
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// Return the result of applying transform t to source.
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std::string s_transform(const std::string& source, Transform t);
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// Convenience wrappers.
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inline std::string s_url_decode(const std::string& source)
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{
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return s_transform(source, url_decode);
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}
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// Joins the source vector of strings into a single string, with each
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// field in source being separated by delimiter. No trailing delimiter is added.
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std::string join(const std::vector<std::string>& source, char delimiter);
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// Splits the source string into multiple fields separated by delimiter,
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// with duplicates of delimiter creating empty fields.
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size_t split(const std::string& source,
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char delimiter,
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std::vector<std::string>* fields);
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// Splits the source string into multiple fields separated by delimiter,
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// with duplicates of delimiter ignored. Trailing delimiter ignored.
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size_t tokenize(const std::string& source,
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char delimiter,
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std::vector<std::string>* fields);
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// Tokenize, including the empty tokens.
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size_t tokenize_with_empty_tokens(const std::string& source,
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char delimiter,
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std::vector<std::string>* fields);
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// Tokenize and append the tokens to fields. Return the new size of fields.
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size_t tokenize_append(const std::string& source,
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char delimiter,
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std::vector<std::string>* fields);
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// Splits the source string into multiple fields separated by delimiter, with
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// duplicates of delimiter ignored. Trailing delimiter ignored. A substring in
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// between the start_mark and the end_mark is treated as a single field. Return
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// the size of fields. For example, if source is "filename
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// \"/Library/Application Support/media content.txt\"", delimiter is ' ', and
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// the start_mark and end_mark are '"', this method returns two fields:
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// "filename" and "/Library/Application Support/media content.txt".
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size_t tokenize(const std::string& source,
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char delimiter,
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char start_mark,
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char end_mark,
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std::vector<std::string>* fields);
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// Extract the first token from source as separated by delimiter, with
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// duplicates of delimiter ignored. Return false if the delimiter could not be
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// found, otherwise return true.
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bool tokenize_first(const std::string& source,
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const char delimiter,
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std::string* token,
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std::string* rest);
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// Convert arbitrary values to/from a string.
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// TODO(jonasolsson): Remove these when absl::StrCat becomes available.
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std::string ToString(bool b);
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std::string ToString(const char* s);
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std::string ToString(std::string t);
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std::string ToString(short s);
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std::string ToString(unsigned short s);
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std::string ToString(int s);
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std::string ToString(unsigned int s);
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std::string ToString(long int s);
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std::string ToString(unsigned long int s);
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std::string ToString(long long int s);
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std::string ToString(unsigned long long int s);
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std::string ToString(double t);
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std::string ToString(long double t);
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std::string ToString(const void* p);
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template <typename T,
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typename std::enable_if<std::is_arithmetic<T>::value && !std::is_same<T, bool>::value,
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int>::type
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= 0>
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static bool FromString(const std::string& s, T* t)
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{
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RTC_DCHECK(t);
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absl::optional<T> result = StringToNumber<T>(s);
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if (result)
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*t = *result;
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return result.has_value();
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}
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bool FromString(const std::string& s, bool* b);
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template <typename T>
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static inline T FromString(const std::string& str)
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{
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T val;
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FromString(str, &val);
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return val;
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}
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//////////////////////////////////////////////////////////////////////
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} // namespace rtc
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#endif // RTC_BASE_STRINGENCODE_H__
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