fuzz coverage

// Copyright (c) 2009-2010 Satoshi Nakamoto

// Copyright (c) 2009-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <util/strencodings.h>

#include <crypto/hex_base.h>

#include <span.h>

#include <array>

#include <cassert>

#include <cstring>

#include <limits>

#include <optional>

#include <ostream>

#include <string>

#include <vector>

static const std::string CHARS_ALPHA_NUM = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

static const std::string SAFE_CHARS[] =

{

    CHARS_ALPHA_NUM + " .,;-_/:?@()", // SAFE_CHARS_DEFAULT

    CHARS_ALPHA_NUM + " .,;-_?@", // SAFE_CHARS_UA_COMMENT

    CHARS_ALPHA_NUM + ".-_", // SAFE_CHARS_FILENAME

    CHARS_ALPHA_NUM + "!*'();:@&=+$,/?#[]-_.~%", // SAFE_CHARS_URI

};

std::string SanitizeString(std::string_view str, int rule)

{

    std::string result;

    for (char c : str) {

        if (SAFE_CHARS[rule].find(c) != std::string::npos) {

            result.push_back(c);

        }

    }

    return result;

}

bool IsHex(std::string_view str)

{

    for (char c : str) {

        if (HexDigit(c) < 0) return false;

    }

    return (str.size() > 0) && (str.size()%2 == 0);

}

template <typename Byte>

std::optional<std::vector<Byte>> TryParseHex(std::string_view str)

{

    std::vector<Byte> vch;

    vch.reserve(str.size() / 2); // two hex characters form a single byte

    auto it = str.begin();

    while (it != str.end()) {

        if (IsSpace(*it)) {

            ++it;

            continue;

        }

        auto c1 = HexDigit(*(it++));

        if (it == str.end()) return std::nullopt;

        auto c2 = HexDigit(*(it++));

        if (c1 < 0 || c2 < 0) return std::nullopt;

        vch.push_back(Byte(c1 << 4) | Byte(c2));

    }

    return vch;

}

Unexecuted instantiation: _Z11TryParseHexISt4byteENSt3__18optionalINS1_6vectorIT_NS1_9allocatorIS4_EEEEEENS1_17basic_string_viewIcNS1_11char_traitsIcEEEE

Unexecuted instantiation: _Z11TryParseHexIhENSt3__18optionalINS0_6vectorIT_NS0_9allocatorIS3_EEEEEENS0_17basic_string_viewIcNS0_11char_traitsIcEEEE

template std::optional<std::vector<std::byte>> TryParseHex(std::string_view);

template std::optional<std::vector<uint8_t>> TryParseHex(std::string_view);

bool SplitHostPort(std::string_view in, uint16_t& portOut, std::string& hostOut)

{

    bool valid = false;

    size_t colon = in.find_last_of(':');

    // if a : is found, and it either follows a [...], or no other : is in the string, treat it as port separator

    bool fHaveColon = colon != in.npos;

    bool fBracketed = fHaveColon && (in[0] == '[' && in[colon - 1] == ']'); // if there is a colon, and in[0]=='[', colon is not 0, so in[colon-1] is safe

    bool fMultiColon{fHaveColon && colon != 0 && (in.find_last_of(':', colon - 1) != in.npos)};

    if (fHaveColon && (colon == 0 || fBracketed || !fMultiColon)) {

        if (const auto n{ToIntegral<uint16_t>(in.substr(colon + 1))}) {

            in = in.substr(0, colon);

            portOut = *n;

            valid = (portOut != 0);

        }

    } else {

        valid = true;

    }

    if (in.size() > 0 && in[0] == '[' && in[in.size() - 1] == ']') {

        hostOut = in.substr(1, in.size() - 2);

    } else {

        hostOut = in;

    }

    return valid;

}

std::string EncodeBase64(std::span<const unsigned char> input)

{

    static const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    std::string str;

    str.reserve(((input.size() + 2) / 3) * 4);

    ConvertBits<8, 6, true>([&](int v) { str += pbase64[v]; }, input.begin(), input.end());

    while (str.size() % 4) str += '=';

    return str;

}

std::optional<std::vector<unsigned char>> DecodeBase64(std::string_view str)

{

    static const int8_t decode64_table[256]{

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1,

        -1, -1, -1, -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,

        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28,

        29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,

        49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1

    };

    if (str.size() % 4 != 0) return {};

    /* One or two = characters at the end are permitted. */

    if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1);

    if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1);

    std::vector<unsigned char> ret;

    ret.reserve((str.size() * 3) / 4);

    bool valid = ConvertBits<6, 8, false>(

        [&](unsigned char c) { ret.push_back(c); },

        str.begin(), str.end(),

        [](char c) { return decode64_table[uint8_t(c)]; }

    );

    if (!valid) return {};

    return ret;

}

std::string EncodeBase32(std::span<const unsigned char> input, bool pad)

{

    static const char *pbase32 = "abcdefghijklmnopqrstuvwxyz234567";

    std::string str;

    str.reserve(((input.size() + 4) / 5) * 8);

    ConvertBits<8, 5, true>([&](int v) { str += pbase32[v]; }, input.begin(), input.end());

    if (pad) {

        while (str.size() % 8) {

            str += '=';

        }

    }

    return str;

}

std::string EncodeBase32(std::string_view str, bool pad)

{

    return EncodeBase32(MakeUCharSpan(str), pad);

}

std::optional<std::vector<unsigned char>> DecodeBase32(std::string_view str)

{

    static const int8_t decode32_table[256]{

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1,

        -1, -1, -1, -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,

        15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1,  0,  1,  2,

         3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,

        23, 24, 25, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,

        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1

    };

    if (str.size() % 8 != 0) return {};

    /* 1, 3, 4, or 6 padding '=' suffix characters are permitted. */

    if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1);

    if (str.size() >= 2 && str.substr(str.size() - 2) == "==") str.remove_suffix(2);

    if (str.size() >= 1 && str.back() == '=') str.remove_suffix(1);

    if (str.size() >= 2 && str.substr(str.size() - 2) == "==") str.remove_suffix(2);

    std::vector<unsigned char> ret;

    ret.reserve((str.size() * 5) / 8);

    bool valid = ConvertBits<5, 8, false>(

        [&](unsigned char c) { ret.push_back(c); },

        str.begin(), str.end(),

        [](char c) { return decode32_table[uint8_t(c)]; }

    );

    if (!valid) return {};

    return ret;

}

std::string FormatParagraph(std::string_view in, size_t width, size_t indent)

{

    assert(width >= indent);

    std::stringstream out;

    size_t ptr = 0;

    size_t indented = 0;

    while (ptr < in.size())

    {

        size_t lineend = in.find_first_of('\n', ptr);

        if (lineend == std::string::npos) {

            lineend = in.size();

        }

        const size_t linelen = lineend - ptr;

        const size_t rem_width = width - indented;

        if (linelen <= rem_width) {

            out << in.substr(ptr, linelen + 1);

            ptr = lineend + 1;

            indented = 0;

        } else {

            size_t finalspace = in.find_last_of(" \n", ptr + rem_width);

            if (finalspace == std::string::npos || finalspace < ptr) {

                // No place to break; just include the entire word and move on

                finalspace = in.find_first_of("\n ", ptr);

                if (finalspace == std::string::npos) {

                    // End of the string, just add it and break

                    out << in.substr(ptr);

                    break;

                }

            }

            out << in.substr(ptr, finalspace - ptr) << "\n";

            if (in[finalspace] == '\n') {

                indented = 0;

            } else if (indent) {

                out << std::string(indent, ' ');

                indented = indent;

            }

            ptr = finalspace + 1;

        }

    }

    return out.str();

}

/** Upper bound for mantissa.

 * 10^18-1 is the largest arbitrary decimal that will fit in a signed 64-bit integer.

 * Larger integers cannot consist of arbitrary combinations of 0-9:

 *

 *   999999999999999999  1^18-1

 *  9223372036854775807  (1<<63)-1  (max int64_t)

 *  9999999999999999999  1^19-1     (would overflow)

 */

static const int64_t UPPER_BOUND = 1000000000000000000LL - 1LL;

/** Helper function for ParseFixedPoint */

static inline bool ProcessMantissaDigit(char ch, int64_t &mantissa, int &mantissa_tzeros)

{

    if(ch == '0')

        ++mantissa_tzeros;

    else {

        for (int i=0; i<=mantissa_tzeros; ++i) {

            if (mantissa > (UPPER_BOUND / 10LL))

                return false; /* overflow */

            mantissa *= 10;

        }

        mantissa += ch - '0';

        mantissa_tzeros = 0;

    }

    return true;

}

bool ParseFixedPoint(std::string_view val, int decimals, int64_t *amount_out)

{

    int64_t mantissa = 0;

    int64_t exponent = 0;

    int mantissa_tzeros = 0;

    bool mantissa_sign = false;

    bool exponent_sign = false;

    int ptr = 0;

    int end = val.size();

    int point_ofs = 0;

    if (ptr < end && val[ptr] == '-') {

        mantissa_sign = true;

        ++ptr;

    }

    if (ptr < end)

    {

        if (val[ptr] == '0') {

            /* pass single 0 */

            ++ptr;

        } else if (val[ptr] >= '1' && val[ptr] <= '9') {

            while (ptr < end && IsDigit(val[ptr])) {

                if (!ProcessMantissaDigit(val[ptr], mantissa, mantissa_tzeros))

                    return false; /* overflow */

                ++ptr;

            }

        } else return false; /* missing expected digit */

    } else return false; /* empty string or loose '-' */

    if (ptr < end && val[ptr] == '.')

    {

        ++ptr;

        if (ptr < end && IsDigit(val[ptr]))

        {

            while (ptr < end && IsDigit(val[ptr])) {

                if (!ProcessMantissaDigit(val[ptr], mantissa, mantissa_tzeros))

                    return false; /* overflow */

                ++ptr;

                ++point_ofs;

            }

        } else return false; /* missing expected digit */

    }

    if (ptr < end && (val[ptr] == 'e' || val[ptr] == 'E'))

    {

        ++ptr;

        if (ptr < end && val[ptr] == '+')

            ++ptr;

        else if (ptr < end && val[ptr] == '-') {

            exponent_sign = true;

            ++ptr;

        }

        if (ptr < end && IsDigit(val[ptr])) {

            while (ptr < end && IsDigit(val[ptr])) {

                if (exponent > (UPPER_BOUND / 10LL))

                    return false; /* overflow */

                exponent = exponent * 10 + val[ptr] - '0';

                ++ptr;

            }

        } else return false; /* missing expected digit */

    }

    if (ptr != end)

        return false; /* trailing garbage */

    /* finalize exponent */

    if (exponent_sign)

        exponent = -exponent;

    exponent = exponent - point_ofs + mantissa_tzeros;

    /* finalize mantissa */

    if (mantissa_sign)

        mantissa = -mantissa;

    /* convert to one 64-bit fixed-point value */

    exponent += decimals;

    if (exponent < 0)

        return false; /* cannot represent values smaller than 10^-decimals */

    if (exponent >= 18)

        return false; /* cannot represent values larger than or equal to 10^(18-decimals) */

    for (int i=0; i < exponent; ++i) {

        if (mantissa > (UPPER_BOUND / 10LL) || mantissa < -(UPPER_BOUND / 10LL))

            return false; /* overflow */

        mantissa *= 10;

    }

    if (mantissa > UPPER_BOUND || mantissa < -UPPER_BOUND)

        return false; /* overflow */

    if (amount_out)

        *amount_out = mantissa;

    return true;

}

std::string ToLower(std::string_view str)

{

    std::string r;

    r.reserve(str.size());

    for (auto ch : str) r += ToLower(ch);

    return r;

}

std::string ToUpper(std::string_view str)

{

    std::string r;

    r.reserve(str.size());

    for (auto ch : str) r += ToUpper(ch);

    return r;

}

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

{

    if (str.empty()) return str;

    str[0] = ToUpper(str.front());

    return str;

}

std::optional<uint64_t> ParseByteUnits(std::string_view str, ByteUnit default_multiplier)

{

    if (str.empty()) {

        return std::nullopt;

    }

    auto multiplier = default_multiplier;

    char unit = str.back();

    switch (unit) {

    case 'k':

        multiplier = ByteUnit::k;

        break;

    case 'K':

        multiplier = ByteUnit::K;

        break;

    case 'm':

        multiplier = ByteUnit::m;

        break;

    case 'M':

        multiplier = ByteUnit::M;

        break;

    case 'g':

        multiplier = ByteUnit::g;

        break;

    case 'G':

        multiplier = ByteUnit::G;

        break;

    case 't':

        multiplier = ByteUnit::t;

        break;

    case 'T':

        multiplier = ByteUnit::T;

        break;

    default:

        unit = 0;

        break;

    }

    uint64_t unit_amount = static_cast<uint64_t>(multiplier);

    auto parsed_num = ToIntegral<uint64_t>(unit ? str.substr(0, str.size() - 1) : str);

    if (!parsed_num || parsed_num > std::numeric_limits<uint64_t>::max() / unit_amount) { // check overflow

        return std::nullopt;

    }

    return *parsed_num * unit_amount;

}