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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file TrieHash.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "TrieHash.h"
#include <libethsupport/TrieCommon.h>
#include <libethcore/CommonEth.h>
using namespace std;
using namespace eth;
namespace eth
{
/*/
#define APPEND_CHILD appendData
/*/
#define APPEND_CHILD appendRaw
/**/
#define ENABLE_DEBUG_PRINT 0
#if ENABLE_DEBUG_PRINT
bool g_hashDebug = false;
#endif
void hash256aux(HexMap const& _s, HexMap::const_iterator _begin, HexMap::const_iterator _end, unsigned _preLen, RLPStream& _rlp);
void hash256rlp(HexMap const& _s, HexMap::const_iterator _begin, HexMap::const_iterator _end, unsigned _preLen, RLPStream& _rlp)
{
#if ENABLE_DEBUG_PRINT
static std::string s_indent;
if (_preLen)
s_indent += " ";
#endif
if (_begin == _end)
_rlp << ""; // NULL
else if (std::next(_begin) == _end)
{
// only one left - terminate with the pair.
_rlp.appendList(2) << hexPrefixEncode(_begin->first, true, _preLen) << _begin->second;
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << toHex(bytesConstRef(_begin->first.data() + _preLen, _begin->first.size() - _preLen), 1) << ": " << _begin->second << " = " << sha3(_rlp.out()) << std::endl;
#endif
}
else
{
// find the number of common prefix nibbles shared
// i.e. the minimum number of nibbles shared at the beginning between the first hex string and each successive.
uint sharedPre = (uint)-1;
uint c = 0;
for (auto i = std::next(_begin); i != _end && sharedPre; ++i, ++c)
{
uint x = std::min(sharedPre, std::min((uint)_begin->first.size(), (uint)i->first.size()));
uint shared = _preLen;
for (; shared < x && _begin->first[shared] == i->first[shared]; ++shared) {}
sharedPre = std::min(shared, sharedPre);
}
if (sharedPre > _preLen)
{
// if they all have the same next nibble, we also want a pair.
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << toHex(bytesConstRef(_begin->first.data() + _preLen, sharedPre), 1) << ": " << std::endl;
#endif
_rlp.appendList(2) << hexPrefixEncode(_begin->first, false, _preLen, (int)sharedPre);
hash256aux(_s, _begin, _end, (unsigned)sharedPre, _rlp);
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << "= " << hex << sha3(_rlp.out()) << dec << std::endl;
#endif
}
else
{
// otherwise enumerate all 16+1 entries.
_rlp.appendList(17);
auto b = _begin;
if (_preLen == b->first.size())
{
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << "@: " << b->second << std::endl;
#endif
++b;
}
for (auto i = 0; i < 16; ++i)
{
auto n = b;
for (; n != _end && n->first[_preLen] == i; ++n) {}
if (b == n)
_rlp << "";
else
{
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << std::hex << i << ": " << std::dec << std::endl;
#endif
hash256aux(_s, b, n, _preLen + 1, _rlp);
}
b = n;
}
if (_preLen == _begin->first.size())
_rlp << _begin->second;
else
_rlp << "";
#if ENABLE_DEBUG_PRINT
if (g_hashDebug)
std::cerr << s_indent << "= " << hex << sha3(_rlp.out()) << dec << std::endl;
#endif
}
}
#if ENABLE_DEBUG_PRINT
if (_preLen)
s_indent.resize(s_indent.size() - 2);
#endif
}
void hash256aux(HexMap const& _s, HexMap::const_iterator _begin, HexMap::const_iterator _end, unsigned _preLen, RLPStream& _rlp)
{
RLPStream rlp;
hash256rlp(_s, _begin, _end, _preLen, rlp);
if (rlp.out().size() < 32)
{
// RECURSIVE RLP
#if ENABLE_DEBUG_PRINT
cerr << "[INLINE: " << dec << rlp.out().size() << " < 32]" << endl;
#endif
_rlp.APPEND_CHILD(rlp.out());
}
else
{
#if ENABLE_DEBUG_PRINT
cerr << "[HASH: " << dec << rlp.out().size() << " >= 32]" << endl;
#endif
_rlp << sha3(rlp.out());
}
}
h256 hash256(StringMap const& _s)
{
// build patricia tree.
if (_s.empty())
return h256();
HexMap hexMap;
for (auto i = _s.rbegin(); i != _s.rend(); ++i)
hexMap[asNibbles(i->first)] = i->second;
RLPStream s;
hash256rlp(hexMap, hexMap.cbegin(), hexMap.cend(), 0, s);
return sha3(s.out());
}
bytes rlp256(StringMap const& _s)
{
// build patricia tree.
if (_s.empty())
return bytes();
HexMap hexMap;
for (auto i = _s.rbegin(); i != _s.rend(); ++i)
hexMap[asNibbles(i->first)] = i->second;
RLPStream s;
hash256aux(hexMap, hexMap.cbegin(), hexMap.cend(), 0, s);
return s.out();
}
h256 hash256(u256Map const& _s)
{
// build patricia tree.
if (_s.empty())
return h256();
HexMap hexMap;
for (auto i = _s.rbegin(); i != _s.rend(); ++i)
hexMap[asNibbles(toBigEndianString(i->first))] = asString(rlp(i->second));
RLPStream s;
hash256rlp(hexMap, hexMap.cbegin(), hexMap.cend(), 0, s);
return sha3(s.out());
}
}
|
