-
Notifications
You must be signed in to change notification settings - Fork 587
/
ExcessReturnDataRecipient.sol
146 lines (136 loc) · 4.53 KB
/
ExcessReturnDataRecipient.sol
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
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.13;
contract ExcessReturnDataRecipient {
uint256 private revertDataSize;
function setRevertDataSize(uint256 size) external {
revertDataSize = size;
}
// Code created with the help of Stack Exchange question
// https://ethereum.stackexchange.com/questions/8086
// Question by Doug King:
// https://ethereum.stackexchange.com/users/2041/doug-king
// Answer by Tjaden Hess:
// https://ethereum.stackexchange.com/users/131/tjaden-hess
// Modified to use Yul instead of Solidity and added change of
// base to convert to natural logarithm
function ln(uint256 x) internal pure returns (uint256 y) {
assembly {
let arg := x
x := sub(x, 1)
x := or(x, div(x, 0x02))
x := or(x, div(x, 0x04))
x := or(x, div(x, 0x10))
x := or(x, div(x, 0x100))
x := or(x, div(x, 0x10000))
x := or(x, div(x, 0x100000000))
x := or(x, div(x, 0x10000000000000000))
x := or(x, div(x, 0x100000000000000000000000000000000))
x := add(x, 1)
let m := mload(0x40)
mstore(
m,
0xf8f9cbfae6cc78fbefe7cdc3a1793dfcf4f0e8bbd8cec470b6a28a7a5a3e1efd
)
mstore(
add(m, 0x20),
0xf5ecf1b3e9debc68e1d9cfabc5997135bfb7a7a3938b7b606b5b4b3f2f1f0ffe
)
mstore(
add(m, 0x40),
0xf6e4ed9ff2d6b458eadcdf97bd91692de2d4da8fd2d0ac50c6ae9a8272523616
)
mstore(
add(m, 0x60),
0xc8c0b887b0a8a4489c948c7f847c6125746c645c544c444038302820181008ff
)
mstore(
add(m, 0x80),
0xf7cae577eec2a03cf3bad76fb589591debb2dd67e0aa9834bea6925f6a4a2e0e
)
mstore(
add(m, 0xa0),
0xe39ed557db96902cd38ed14fad815115c786af479b7e83247363534337271707
)
mstore(
add(m, 0xc0),
0xc976c13bb96e881cb166a933a55e490d9d56952b8d4e801485467d2362422606
)
mstore(
add(m, 0xe0),
0x753a6d1b65325d0c552a4d1345224105391a310b29122104190a110309020100
)
mstore(0x40, add(m, 0x100))
let
magic
:= 0x818283848586878898a8b8c8d8e8f929395969799a9b9d9e9faaeb6bedeeff
let
shift
:= 0x100000000000000000000000000000000000000000000000000000000000000
let a := div(mul(x, magic), shift)
y := div(mload(add(m, sub(255, a))), shift)
y := add(
y,
mul(
256,
gt(
arg,
0x8000000000000000000000000000000000000000000000000000000000000000
)
)
)
y := mul(y, 10000000000000000)
y := div(y, 14426950408889632)
}
}
function sqrt(uint256 y) internal pure returns (uint256 z) {
assembly {
switch gt(y, 3)
case 1 {
z := y
let x := div(add(y, 1), 2)
for {
} lt(x, z) {
} {
z := x
x := div(add(div(y, x), x), 2)
}
}
case 0 {
z := 1
}
}
}
function onERC1155Received(
address,
address,
uint256,
uint256,
bytes calldata
) external view returns (bytes4 magic) {
magic = this.onERC1155Received.selector;
if (revertDataSize > 0) {
uint256 gasToCalculateSqrt = (54 * ln(gasleft())) + 1200;
uint256 w = (sqrt(
2048 * (gasleft() - gasToCalculateSqrt) + 9431040
) - 3072) / 4;
assembly {
let size := mul(w, 32)
calldatacopy(0, 0, mul(w, 32))
revert(0, size)
}
}
}
receive() external payable {
if (revertDataSize > 0) {
uint256 gasToCalculateSqrt = (54 * ln(gasleft())) + 1200;
uint256 w = (sqrt(
2048 * (gasleft() - gasToCalculateSqrt) + 9431040
) - 3072) / 2;
assembly {
let size := mul(w, 32)
calldatacopy(0, 0, mul(w, 32))
revert(0, size)
}
}
}
}