LCOV - code coverage report
Current view: top level - src/util - strencodings.h (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 42 42 100.0 %
Date: 2020-09-17 15:21:04 Functions: 14 14 100.0 %
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           Branch data     Line data    Source code
#       1                 :            : // Copyright (c) 2009-2010 Satoshi Nakamoto
#       2                 :            : // Copyright (c) 2009-2020 The Bitcoin Core developers
#       3                 :            : // Distributed under the MIT software license, see the accompanying
#       4                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
#       5                 :            : 
#       6                 :            : /**
#       7                 :            :  * Utilities for converting data from/to strings.
#       8                 :            :  */
#       9                 :            : #ifndef BITCOIN_UTIL_STRENCODINGS_H
#      10                 :            : #define BITCOIN_UTIL_STRENCODINGS_H
#      11                 :            : 
#      12                 :            : #include <attributes.h>
#      13                 :            : #include <span.h>
#      14                 :            : 
#      15                 :            : #include <cstdint>
#      16                 :            : #include <iterator>
#      17                 :            : #include <string>
#      18                 :            : #include <vector>
#      19                 :            : 
#      20                 :      77126 : #define ARRAYLEN(array)     (sizeof(array)/sizeof((array)[0]))
#      21                 :            : 
#      22                 :            : /** Used by SanitizeString() */
#      23                 :            : enum SafeChars
#      24                 :            : {
#      25                 :            :     SAFE_CHARS_DEFAULT, //!< The full set of allowed chars
#      26                 :            :     SAFE_CHARS_UA_COMMENT, //!< BIP-0014 subset
#      27                 :            :     SAFE_CHARS_FILENAME, //!< Chars allowed in filenames
#      28                 :            :     SAFE_CHARS_URI, //!< Chars allowed in URIs (RFC 3986)
#      29                 :            : };
#      30                 :            : 
#      31                 :            : /**
#      32                 :            : * Remove unsafe chars. Safe chars chosen to allow simple messages/URLs/email
#      33                 :            : * addresses, but avoid anything even possibly remotely dangerous like & or >
#      34                 :            : * @param[in] str    The string to sanitize
#      35                 :            : * @param[in] rule   The set of safe chars to choose (default: least restrictive)
#      36                 :            : * @return           A new string without unsafe chars
#      37                 :            : */
#      38                 :            : std::string SanitizeString(const std::string& str, int rule = SAFE_CHARS_DEFAULT);
#      39                 :            : std::vector<unsigned char> ParseHex(const char* psz);
#      40                 :            : std::vector<unsigned char> ParseHex(const std::string& str);
#      41                 :            : signed char HexDigit(char c);
#      42                 :            : /* Returns true if each character in str is a hex character, and has an even
#      43                 :            :  * number of hex digits.*/
#      44                 :            : bool IsHex(const std::string& str);
#      45                 :            : /**
#      46                 :            : * Return true if the string is a hex number, optionally prefixed with "0x"
#      47                 :            : */
#      48                 :            : bool IsHexNumber(const std::string& str);
#      49                 :            : std::vector<unsigned char> DecodeBase64(const char* p, bool* pf_invalid = nullptr);
#      50                 :            : std::string DecodeBase64(const std::string& str, bool* pf_invalid = nullptr);
#      51                 :            : std::string EncodeBase64(Span<const unsigned char> input);
#      52                 :            : std::string EncodeBase64(const std::string& str);
#      53                 :            : std::vector<unsigned char> DecodeBase32(const char* p, bool* pf_invalid = nullptr);
#      54                 :            : std::string DecodeBase32(const std::string& str, bool* pf_invalid = nullptr);
#      55                 :            : 
#      56                 :            : /**
#      57                 :            :  * Base32 encode.
#      58                 :            :  * If `pad` is true, then the output will be padded with '=' so that its length
#      59                 :            :  * is a multiple of 8.
#      60                 :            :  */
#      61                 :            : std::string EncodeBase32(Span<const unsigned char> input, bool pad = true);
#      62                 :            : 
#      63                 :            : /**
#      64                 :            :  * Base32 encode.
#      65                 :            :  * If `pad` is true, then the output will be padded with '=' so that its length
#      66                 :            :  * is a multiple of 8.
#      67                 :            :  */
#      68                 :            : std::string EncodeBase32(const std::string& str, bool pad = true);
#      69                 :            : 
#      70                 :            : void SplitHostPort(std::string in, int& portOut, std::string& hostOut);
#      71                 :            : int64_t atoi64(const std::string& str);
#      72                 :            : int atoi(const std::string& str);
#      73                 :            : 
#      74                 :            : /**
#      75                 :            :  * Tests if the given character is a decimal digit.
#      76                 :            :  * @param[in] c     character to test
#      77                 :            :  * @return          true if the argument is a decimal digit; otherwise false.
#      78                 :            :  */
#      79                 :            : constexpr bool IsDigit(char c)
#      80                 :     518445 : {
#      81                 :     518445 :     return c >= '0' && c <= '9';
#      82                 :     518445 : }
#      83                 :            : 
#      84                 :            : /**
#      85                 :            :  * Tests if the given character is a whitespace character. The whitespace characters
#      86                 :            :  * are: space, form-feed ('\f'), newline ('\n'), carriage return ('\r'), horizontal
#      87                 :            :  * tab ('\t'), and vertical tab ('\v').
#      88                 :            :  *
#      89                 :            :  * This function is locale independent. Under the C locale this function gives the
#      90                 :            :  * same result as std::isspace.
#      91                 :            :  *
#      92                 :            :  * @param[in] c     character to test
#      93                 :            :  * @return          true if the argument is a whitespace character; otherwise false
#      94                 :            :  */
#      95                 :   43015361 : constexpr inline bool IsSpace(char c) noexcept {
#      96                 :   43015361 :     return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v';
#      97                 :   43015361 : }
#      98                 :            : 
#      99                 :            : /**
#     100                 :            :  * Convert string to signed 32-bit integer with strict parse error feedback.
#     101                 :            :  * @returns true if the entire string could be parsed as valid integer,
#     102                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     103                 :            :  */
#     104                 :            : NODISCARD bool ParseInt32(const std::string& str, int32_t *out);
#     105                 :            : 
#     106                 :            : /**
#     107                 :            :  * Convert string to signed 64-bit integer with strict parse error feedback.
#     108                 :            :  * @returns true if the entire string could be parsed as valid integer,
#     109                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     110                 :            :  */
#     111                 :            : NODISCARD bool ParseInt64(const std::string& str, int64_t *out);
#     112                 :            : 
#     113                 :            : /**
#     114                 :            :  * Convert decimal string to unsigned 8-bit integer with strict parse error feedback.
#     115                 :            :  * @returns true if the entire string could be parsed as valid integer,
#     116                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     117                 :            :  */
#     118                 :            : NODISCARD bool ParseUInt8(const std::string& str, uint8_t *out);
#     119                 :            : 
#     120                 :            : /**
#     121                 :            :  * Convert decimal string to unsigned 32-bit integer with strict parse error feedback.
#     122                 :            :  * @returns true if the entire string could be parsed as valid integer,
#     123                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     124                 :            :  */
#     125                 :            : NODISCARD bool ParseUInt32(const std::string& str, uint32_t *out);
#     126                 :            : 
#     127                 :            : /**
#     128                 :            :  * Convert decimal string to unsigned 64-bit integer with strict parse error feedback.
#     129                 :            :  * @returns true if the entire string could be parsed as valid integer,
#     130                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     131                 :            :  */
#     132                 :            : NODISCARD bool ParseUInt64(const std::string& str, uint64_t *out);
#     133                 :            : 
#     134                 :            : /**
#     135                 :            :  * Convert string to double with strict parse error feedback.
#     136                 :            :  * @returns true if the entire string could be parsed as valid double,
#     137                 :            :  *   false if not the entire string could be parsed or when overflow or underflow occurred.
#     138                 :            :  */
#     139                 :            : NODISCARD bool ParseDouble(const std::string& str, double *out);
#     140                 :            : 
#     141                 :            : /**
#     142                 :            :  * Convert a span of bytes to a lower-case hexadecimal string.
#     143                 :            :  */
#     144                 :            : std::string HexStr(const Span<const uint8_t> s);
#     145                 :       4012 : inline std::string HexStr(const Span<const char> s) { return HexStr(MakeUCharSpan(s)); }
#     146                 :            : 
#     147                 :            : /**
#     148                 :            :  * Format a paragraph of text to a fixed width, adding spaces for
#     149                 :            :  * indentation to any added line.
#     150                 :            :  */
#     151                 :            : std::string FormatParagraph(const std::string& in, size_t width = 79, size_t indent = 0);
#     152                 :            : 
#     153                 :            : /**
#     154                 :            :  * Timing-attack-resistant comparison.
#     155                 :            :  * Takes time proportional to length
#     156                 :            :  * of first argument.
#     157                 :            :  */
#     158                 :            : template <typename T>
#     159                 :            : bool TimingResistantEqual(const T& a, const T& b)
#     160                 :      74752 : {
#     161                 :      74752 :     if (b.size() == 0) return a.size() == 0;
#     162                 :      74748 :     size_t accumulator = a.size() ^ b.size();
#     163                 :    5673024 :     for (size_t i = 0; i < a.size(); i++)
#     164                 :    5598276 :         accumulator |= a[i] ^ b[i%b.size()];
#     165                 :      74748 :     return accumulator == 0;
#     166                 :      74748 : }
#     167                 :            : 
#     168                 :            : /** Parse number as fixed point according to JSON number syntax.
#     169                 :            :  * See http://json.org/number.gif
#     170                 :            :  * @returns true on success, false on error.
#     171                 :            :  * @note The result must be in the range (-10^18,10^18), otherwise an overflow error will trigger.
#     172                 :            :  */
#     173                 :            : NODISCARD bool ParseFixedPoint(const std::string &val, int decimals, int64_t *amount_out);
#     174                 :            : 
#     175                 :            : /** Convert from one power-of-2 number base to another. */
#     176                 :            : template<int frombits, int tobits, bool pad, typename O, typename I>
#     177                 :     133281 : bool ConvertBits(const O& outfn, I it, I end) {
#     178                 :     133281 :     size_t acc = 0;
#     179                 :     133281 :     size_t bits = 0;
#     180                 :     133281 :     constexpr size_t maxv = (1 << tobits) - 1;
#     181                 :     133281 :     constexpr size_t max_acc = (1 << (frombits + tobits - 1)) - 1;
#     182                 :    9651991 :     while (it != end) {
#     183                 :    9518710 :         acc = ((acc << frombits) | *it) & max_acc;
#     184                 :    9518710 :         bits += frombits;
#     185                 :   17490911 :         while (bits >= tobits) {
#     186                 :    7972201 :             bits -= tobits;
#     187                 :    7972201 :             outfn((acc >> bits) & maxv);
#     188                 :    7972201 :         }
#     189                 :    9518710 :         ++it;
#     190                 :    9518710 :     }
#     191                 :     133281 :     if (pad) {
#     192                 :      42589 :         if (bits) outfn((acc << (tobits - bits)) & maxv);
#     193                 :      90692 :     } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
#     194                 :         13 :         return false;
#     195                 :         13 :     }
#     196                 :     133268 :     return true;
#     197                 :     133268 : }
#     198                 :            : 
#     199                 :            : /**
#     200                 :            :  * Converts the given character to its lowercase equivalent.
#     201                 :            :  * This function is locale independent. It only converts uppercase
#     202                 :            :  * characters in the standard 7-bit ASCII range.
#     203                 :            :  * This is a feature, not a limitation.
#     204                 :            :  *
#     205                 :            :  * @param[in] c     the character to convert to lowercase.
#     206                 :            :  * @return          the lowercase equivalent of c; or the argument
#     207                 :            :  *                  if no conversion is possible.
#     208                 :            :  */
#     209                 :            : constexpr char ToLower(char c)
#     210                 :      81926 : {
#     211                 :      81926 :     return (c >= 'A' && c <= 'Z' ? (c - 'A') + 'a' : c);
#     212                 :      81926 : }
#     213                 :            : 
#     214                 :            : /**
#     215                 :            :  * Returns the lowercase equivalent of the given string.
#     216                 :            :  * This function is locale independent. It only converts uppercase
#     217                 :            :  * characters in the standard 7-bit ASCII range.
#     218                 :            :  * This is a feature, not a limitation.
#     219                 :            :  *
#     220                 :            :  * @param[in] str   the string to convert to lowercase.
#     221                 :            :  * @returns         lowercased equivalent of str
#     222                 :            :  */
#     223                 :            : std::string ToLower(const std::string& str);
#     224                 :            : 
#     225                 :            : /**
#     226                 :            :  * Converts the given character to its uppercase equivalent.
#     227                 :            :  * This function is locale independent. It only converts lowercase
#     228                 :            :  * characters in the standard 7-bit ASCII range.
#     229                 :            :  * This is a feature, not a limitation.
#     230                 :            :  *
#     231                 :            :  * @param[in] c     the character to convert to uppercase.
#     232                 :            :  * @return          the uppercase equivalent of c; or the argument
#     233                 :            :  *                  if no conversion is possible.
#     234                 :            :  */
#     235                 :            : constexpr char ToUpper(char c)
#     236                 :        948 : {
#     237                 :        948 :     return (c >= 'a' && c <= 'z' ? (c - 'a') + 'A' : c);
#     238                 :        948 : }
#     239                 :            : 
#     240                 :            : /**
#     241                 :            :  * Returns the uppercase equivalent of the given string.
#     242                 :            :  * This function is locale independent. It only converts lowercase
#     243                 :            :  * characters in the standard 7-bit ASCII range.
#     244                 :            :  * This is a feature, not a limitation.
#     245                 :            :  *
#     246                 :            :  * @param[in] str   the string to convert to uppercase.
#     247                 :            :  * @returns         UPPERCASED EQUIVALENT OF str
#     248                 :            :  */
#     249                 :            : std::string ToUpper(const std::string& str);
#     250                 :            : 
#     251                 :            : /**
#     252                 :            :  * Capitalizes the first character of the given string.
#     253                 :            :  * This function is locale independent. It only converts lowercase
#     254                 :            :  * characters in the standard 7-bit ASCII range.
#     255                 :            :  * This is a feature, not a limitation.
#     256                 :            :  *
#     257                 :            :  * @param[in] str   the string to capitalize.
#     258                 :            :  * @returns         string with the first letter capitalized.
#     259                 :            :  */
#     260                 :            : std::string Capitalize(std::string str);
#     261                 :            : 
#     262                 :            : #endif // BITCOIN_UTIL_STRENCODINGS_H

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