strencodings.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_UTIL_STRENCODINGS_H
#define BITCOIN_UTIL_STRENCODINGS_H

#include <attributes.h>
#include <span.h>

#include <cstdint>
#include <iterator>
#include <string>
#include <vector>

enum SafeChars
{
    SAFE_CHARS_DEFAULT, 
    SAFE_CHARS_UA_COMMENT, 
    SAFE_CHARS_FILENAME, 
    SAFE_CHARS_URI, 
};

std::string SanitizeString(const std::string& str, int rule = SAFE_CHARS_DEFAULT);
std::vector<unsigned char> ParseHex(const char* psz);
std::vector<unsigned char> ParseHex(const std::string& str);
signed char HexDigit(char c);
/* Returns true if each character in str is a hex character, and has an even
 * number of hex digits.*/
bool IsHex(const std::string& str);
bool IsHexNumber(const std::string& str);
std::vector<unsigned char> DecodeBase64(const char* p, bool* pf_invalid = nullptr);
std::string DecodeBase64(const std::string& str, bool* pf_invalid = nullptr);
std::string EncodeBase64(Span<const unsigned char> input);
std::string EncodeBase64(const std::string& str);
std::vector<unsigned char> DecodeBase32(const char* p, bool* pf_invalid = nullptr);
std::string DecodeBase32(const std::string& str, bool* pf_invalid = nullptr);

std::string EncodeBase32(Span<const unsigned char> input, bool pad = true);

std::string EncodeBase32(const std::string& str, bool pad = true);

void SplitHostPort(std::string in, uint16_t& portOut, std::string& hostOut);
int64_t atoi64(const std::string& str);
int atoi(const std::string& str);

constexpr bool IsDigit(char c)
{
    return c >= '0' && c <= '9';
}

constexpr inline bool IsSpace(char c) noexcept {
    return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v';
}

[[nodiscard]] bool ParseInt32(const std::string& str, int32_t *out);

[[nodiscard]] bool ParseInt64(const std::string& str, int64_t *out);

[[nodiscard]] bool ParseUInt8(const std::string& str, uint8_t *out);

[[nodiscard]] bool ParseUInt16(const std::string& str, uint16_t* out);

[[nodiscard]] bool ParseUInt32(const std::string& str, uint32_t *out);

[[nodiscard]] bool ParseUInt64(const std::string& str, uint64_t *out);

[[nodiscard]] bool ParseDouble(const std::string& str, double *out);

std::string HexStr(const Span<const uint8_t> s);
inline std::string HexStr(const Span<const char> s) { return HexStr(MakeUCharSpan(s)); }

std::string FormatParagraph(const std::string& in, size_t width = 79, size_t indent = 0);

template <typename T>
bool TimingResistantEqual(const T& a, const T& b)
{
    if (b.size() == 0) return a.size() == 0;
    size_t accumulator = a.size() ^ b.size();
    for (size_t i = 0; i < a.size(); i++)
        accumulator |= a[i] ^ b[i%b.size()];
    return accumulator == 0;
}

[[nodiscard]] bool ParseFixedPoint(const std::string &val, int decimals, int64_t *amount_out);

template<int frombits, int tobits, bool pad, typename O, typename I>
bool ConvertBits(const O& outfn, I it, I end) {
    size_t acc = 0;
    size_t bits = 0;
    constexpr size_t maxv = (1 << tobits) - 1;
    constexpr size_t max_acc = (1 << (frombits + tobits - 1)) - 1;
    while (it != end) {
        acc = ((acc << frombits) | *it) & max_acc;
        bits += frombits;
        while (bits >= tobits) {
            bits -= tobits;
            outfn((acc >> bits) & maxv);
        }
        ++it;
    }
    if (pad) {
        if (bits) outfn((acc << (tobits - bits)) & maxv);
    } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
        return false;
    }
    return true;
}

constexpr char ToLower(char c)
{
    return (c >= 'A' && c <= 'Z' ? (c - 'A') + 'a' : c);
}

std::string ToLower(const std::string& str);

constexpr char ToUpper(char c)
{
    return (c >= 'a' && c <= 'z' ? (c - 'a') + 'A' : c);
}

std::string ToUpper(const std::string& str);

std::string Capitalize(std::string str);

#endif // BITCOIN_UTIL_STRENCODINGS_H