libdevcore/CommonData.cpp at master · oort-tech/libdevcore · GitHub

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
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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
// Aleth: Ethereum C++ client, tools and libraries.
// Copyright 2014-2019 Aleth Authors.
// Licensed under the GNU General Public License, Version 3.


#include "CommonData.h"
#include <random>

#include "Exceptions.h"

//using namespace std;
using namespace dev;

namespace
{
int fromHexChar(char _i) noexcept
{
	if (_i >= '0' && _i <= '9')
		return _i - '0';
	if (_i >= 'a' && _i <= 'f')
		return _i - 'a' + 10;
	if (_i >= 'A' && _i <= 'F')
		return _i - 'A' + 10;
	return -1;
}
}

bool dev::isHex(std::string const& _s) noexcept
{
	auto it = _s.begin();
	if (_s.compare(0, 2, "0x") == 0)
		it += 2;
	return std::all_of(it, _s.end(), [](char c){ return fromHexChar(c) != -1; });
}

std::string dev::escaped(std::string const& _s, bool _all)
{
	static const std::map<char, char> prettyEscapes{{'\r', 'r'}, {'\n', 'n'}, {'\t', 't'}, {'\v', 'v'}};
	std::string ret;
	ret.reserve(_s.size() + 2);
	ret.push_back('"');
	for (auto i: _s)
		if (i == '"' && !_all)
			ret += "\\\"";
		else if (i == '\\' && !_all)
			ret += "\\\\";
		else if (prettyEscapes.count(i) && !_all)
		{
			ret += '\\';
			ret += prettyEscapes.find(i)->second;
		}
		else if (i < ' ' || _all)
		{
			ret += "\\x";
			ret.push_back("0123456789abcdef"[(uint8_t)i / 16]);
			ret.push_back("0123456789abcdef"[(uint8_t)i % 16]);
		}
		else
			ret.push_back(i);
	ret.push_back('"');
	return ret;
}


bytes dev::fromHex(std::string const& _s, WhenError _throw)
{
	unsigned s = (_s.size() >= 2 && _s[0] == '0' && _s[1] == 'x') ? 2 : 0;
	std::vector<uint8_t> ret;
	ret.reserve((_s.size() - s + 1) / 2);

	if (_s.size() % 2)
	{
		int h = fromHexChar(_s[s++]);
		if (h != -1)
			ret.push_back(h);
		else if (_throw == WhenError::Throw)
			BOOST_THROW_EXCEPTION(BadHexCharacter());
		else
			return bytes();
	}
	for (unsigned i = s; i < _s.size(); i += 2)
	{
		int h = fromHexChar(_s[i]);
		int l = fromHexChar(_s[i + 1]);
		if (h != -1 && l != -1)
			ret.push_back((byte)(h * 16 + l));
		else if (_throw == WhenError::Throw)
			BOOST_THROW_EXCEPTION(BadHexCharacter());
		else
			return bytes();
	}
	return ret;
}

bytes dev::asNibbles(bytesConstRef const& _s)
{
	std::vector<uint8_t> ret;
	ret.reserve(_s.size() * 2);
	for (auto i: _s)
	{
		ret.push_back(i / 16);
		ret.push_back(i % 16);
	}
	return ret;
}