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hush3/src/utilstrencodings.cpp
Duke Leto be16f80abc Hush Full Node is now GPLv3 
Any projects which want to use Hush code from now on will need to be licensed as
GPLv3 or we will send the lawyers: https://www.softwarefreedom.org/

Notably, Komodo (KMD) is licensed as GPLv2 and is no longer compatible to receive
code changes, without causing legal issues. MIT projects, such as Zcash, also cannot pull
in changes from the Hush Full Node without permission from The Hush Developers,
which may in some circumstances grant an MIT license on a case-by-case basis.
2020-10-21 07:28:10 -04:00

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin Core developers
// Distributed under the GPLv3 software license, see the accompanying
// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
#include "utilstrencodings.h"
#include "tinyformat.h"
#include <cstdlib>
#include <cstring>
#include <errno.h>
#include <iomanip>
#include <limits>
using namespace std;
static const string CHARS_ALPHA_NUM = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static const string SAFE_CHARS[] =
{
CHARS_ALPHA_NUM + " .,;_/:?@()", // SAFE_CHARS_DEFAULT
CHARS_ALPHA_NUM + " .,;_?@", // SAFE_CHARS_UA_COMMENT
CHARS_ALPHA_NUM + "!*'();:@&=+$,/?#[]-_.~%" // SAFE_CHARS_URI
};
string SanitizeString(const string& str, int rule)
{
string strResult;
for (std::string::size_type i = 0; i < str.size(); i++)
{
if (SAFE_CHARS[rule].find(str[i]) != std::string::npos)
strResult.push_back(str[i]);
}
return strResult;
}
string SanitizeFilename(const string& str)
{
/**
* safeChars chosen to restrict filename, keeping it simple to avoid cross-platform issues.
* http://stackoverflow.com/a/2306003
*/
static string safeChars("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890");
string strResult;
for (std::string::size_type i = 0; i < str.size(); i++)
{
if (safeChars.find(str[i]) != std::string::npos)
strResult.push_back(str[i]);
}
return strResult;
}
std::string HexInt(uint32_t val)
{
std::stringstream ss;
ss << std::setfill('0') << std::setw(sizeof(uint32_t) * 2) << std::hex << val;
return ss.str();
}
uint32_t ParseHexToUInt32(const std::string& str) {
std::istringstream converter(str);
uint32_t value;
converter >> std::hex >> value;
return value;
}
const signed char p_util_hexdigit[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,
0,1,2,3,4,5,6,7,8,9,-1,-1,-1,-1,-1,-1,
-1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,0xa,0xb,0xc,0xd,0xe,0xf,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, };
signed char HexDigit(char c)
{
return p_util_hexdigit[(unsigned char)c];
}
bool IsHex(const string& str)
{
for(std::string::const_iterator it(str.begin()); it != str.end(); ++it)
{
if (HexDigit(*it) < 0)
return false;
}
return (str.size() > 0) && (str.size()%2 == 0);
}
vector<unsigned char> ParseHex(const char* psz)
{
// convert hex dump to vector
vector<unsigned char> vch;
while (true)
{
while (isspace(*psz))
psz++;
signed char c = HexDigit(*psz++);
if (c == (signed char)-1)
break;
unsigned char n = (c << 4);
c = HexDigit(*psz++);
if (c == (signed char)-1)
break;
n |= c;
vch.push_back(n);
}
return vch;
}
vector<unsigned char> ParseHex(const string& str)
{
return ParseHex(str.c_str());
}
string EncodeBase64(const unsigned char* pch, size_t len)
{
static const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::string str;
str.reserve(((len + 2) / 3) * 4);
ConvertBits<8, 6, true>([&](int v) { str += pbase64[v]; }, pch, pch + len);
while (str.size() % 4) str += '=';
return str;
}
string EncodeBase64(const string& str)
{
return EncodeBase64((const unsigned char*)str.c_str(), str.size());
}
vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid)
{
static const int 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
};
const char* e = p;
std::vector<uint8_t> val;
val.reserve(strlen(p));
while (*p != 0) {
int x = decode64_table[(unsigned char)*p];
if (x == -1) break;
val.push_back(x);
++p;
}
std::vector<unsigned char> ret;
ret.reserve((val.size() * 3) / 4);
bool valid = ConvertBits<6, 8, false>([&](unsigned char c) { ret.push_back(c); }, val.begin(), val.end());
const char* q = p;
while (valid && *p != 0) {
if (*p != '=') {
valid = false;
break;
}
++p;
}
valid = valid && (p - e) % 4 == 0 && p - q < 4;
if (pfInvalid) *pfInvalid = !valid;
return ret;
}
string DecodeBase64(const string& str)
{
vector<unsigned char> vchRet = DecodeBase64(str.c_str());
return (vchRet.size() == 0) ? string() : string((const char*)&vchRet[0], vchRet.size());
}
string EncodeBase32(const unsigned char* pch, size_t len)
{
static const char *pbase32 = "abcdefghijklmnopqrstuvwxyz234567";
std::string str;
str.reserve(((len + 4) / 5) * 8);
ConvertBits<8, 5, true>([&](int v) { str += pbase32[v]; }, pch, pch + len);
while (str.size() % 8) str += '=';
return str;
}
string EncodeBase32(const string& str)
{
return EncodeBase32((const unsigned char*)str.c_str(), str.size());
}
vector<unsigned char> DecodeBase32(const char* p, bool* pfInvalid)
{
static const int 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
};
const char* e = p;
std::vector<uint8_t> val;
val.reserve(strlen(p));
while (*p != 0) {
int x = decode32_table[(unsigned char)*p];
if (x == -1) break;
val.push_back(x);
++p;
}
std::vector<unsigned char> ret;
ret.reserve((val.size() * 5) / 8);
bool valid = ConvertBits<5, 8, false>([&](unsigned char c) { ret.push_back(c); }, val.begin(), val.end());
const char* q = p;
while (valid && *p != 0) {
if (*p != '=') {
valid = false;
break;
}
++p;
}
valid = valid && (p - e) % 8 == 0 && p - q < 8;
if (pfInvalid) *pfInvalid = !valid;
return ret;
}
string DecodeBase32(const string& str)
{
vector<unsigned char> vchRet = DecodeBase32(str.c_str());
return (vchRet.size() == 0) ? string() : string((const char*)&vchRet[0], vchRet.size());
}
static bool ParsePrechecks(const std::string& str)
{
if (str.empty()) // No empty string allowed
return false;
if (str.size() >= 1 && (isspace(str[0]) || isspace(str[str.size()-1]))) // No padding allowed
return false;
if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
return false;
return true;
}
bool ParseInt32(const std::string& str, int32_t *out)
{
if (!ParsePrechecks(str))
return false;
char *endp = NULL;
errno = 0; // strtol will not set errno if valid
long int n = strtol(str.c_str(), &endp, 10);
if(out) *out = (int32_t)n;
// Note that strtol returns a *long int*, so even if strtol doesn't report a over/underflow
// we still have to check that the returned value is within the range of an *int32_t*. On 64-bit
// platforms the size of these types may be different.
return endp && *endp == 0 && !errno &&
n >= std::numeric_limits<int32_t>::min() &&
n <= std::numeric_limits<int32_t>::max();
}
bool ParseInt64(const std::string& str, int64_t *out)
{
if (!ParsePrechecks(str))
return false;
char *endp = NULL;
errno = 0; // strtoll will not set errno if valid
long long int n = strtoll(str.c_str(), &endp, 10);
if(out) *out = (int64_t)n;
// Note that strtoll returns a *long long int*, so even if strtol doesn't report a over/underflow
// we still have to check that the returned value is within the range of an *int64_t*.
return endp && *endp == 0 && !errno &&
n >= std::numeric_limits<int64_t>::min() &&
n <= std::numeric_limits<int64_t>::max();
}
bool ParseDouble(const std::string& str, double *out)
{
if (!ParsePrechecks(str))
return false;
if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
return false;
std::istringstream text(str);
text.imbue(std::locale::classic());
double result;
text >> result;
if(out) *out = result;
return text.eof() && !text.fail();
}
std::string FormatParagraph(const std::string& in, size_t width, size_t indent)
{
std::stringstream out;
size_t col = 0;
size_t ptr = 0;
while(ptr < in.size())
{
// Find beginning of next word
ptr = in.find_first_not_of(' ', ptr);
if (ptr == std::string::npos)
break;
// Find end of next word
size_t endword = in.find_first_of(' ', ptr);
if (endword == std::string::npos)
endword = in.size();
// Add newline and indentation if this wraps over the allowed width
if (col > 0)
{
if ((col + endword - ptr) > width)
{
out << '\n';
for(size_t i=0; i<indent; ++i)
out << ' ';
col = 0;
} else
out << ' ';
}
// Append word
out << in.substr(ptr, endword - ptr);
col += endword - ptr + 1;
ptr = endword;
}
return out.str();
}
std::string i64tostr(int64_t n)
{
return strprintf("%d", n);
}
std::string itostr(int n)
{
return strprintf("%d", n);
}
int64_t atoi64(const char* psz)
{
#ifdef _MSC_VER
return _atoi64(psz);
#else
return strtoll(psz, NULL, 10);
#endif
}
int64_t atoi64(const std::string& str)
{
#ifdef _MSC_VER
return _atoi64(str.c_str());
#else
return strtoll(str.c_str(), NULL, 10);
#endif
}
int atoi(const std::string& str)
{
return atoi(str.c_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(const std::string &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 i,n,ptr = 0; char *str = (char *)val.c_str();
int end = val.size();
int point_ofs = 0;
n = val.size();
if ( n == 11 && (val[0] < '9' || val[1] < '3') )
{
uint64_t val64 = 0;
for (i=0; i<n; i++)
{
if ( val[i] < '0' || val[i] > '9' )
break;
val64 = (val64 * 10) + (val[i] - '0');
}
if ( i == n ) // 90000000000
{
*amount_out = val64 * 100000000;
//fprintf(stderr,"special case: %s -> %.8f\n",val.c_str(),(double)*amount_out/100000000);
return(true);
}
}
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 && val[ptr] >= '0' && val[ptr] <= '9') {
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 && val[ptr] >= '0' && val[ptr] <= '9')
{
while (ptr < end && val[ptr] >= '0' && val[ptr] <= '9') {
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 && val[ptr] >= '0' && val[ptr] <= '9') {
while (ptr < end && val[ptr] >= '0' && val[ptr] <= '9') {
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;
}
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