This repository has been archived by the owner on Aug 6, 2021. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 7
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #87 from atpar/dev
Merge dev into master
- Loading branch information
Showing
36 changed files
with
537 additions
and
507 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // "SPDX-License-Identifier: Apache-2.0" | ||
| pragma solidity ^0.7.0; | ||
|
|
||
|
|
||
| /** | ||
| * Fixed point math library for signed integers | ||
| */ | ||
| library FixedPointMath { | ||
|
|
||
| int256 constant private INT256_MIN = -2 ** 255; | ||
|
|
||
| uint256 constant public PRECISION = 18; | ||
| uint256 constant public MULTIPLICATOR = 10 ** PRECISION; | ||
|
|
||
|
|
||
| /** | ||
| * @dev The product of a and b has to be less than INT256_MAX (~10 ** 76), | ||
| * as devision (normalization) is performed after multiplication | ||
| * Upper boundary would be (10 ** 58) * (MULTIPLICATOR) == ~10 ** 76 | ||
| */ | ||
| function fixedMul(int256 a, int256 b) internal pure returns (int256) { | ||
| if (a == 0 || b == 0) return 0; | ||
|
|
||
| require( | ||
| !(a == -1 && b == INT256_MIN), | ||
| "FixedPointMath.fixedMul: OVERFLOW_DETECTED" | ||
| ); | ||
|
|
||
| int256 c = a * b; | ||
| require( | ||
| c / a == b, | ||
| "FixedPointMath.fixedMul: OVERFLOW_DETECTED" | ||
| ); | ||
|
|
||
| // normalize (divide by MULTIPLICATOR) | ||
| int256 d = c / int256(MULTIPLICATOR); | ||
| require( | ||
| d != 0, | ||
| "FixedPointMath.fixedMul: CANNOT_REPRESENT_GRANULARITY" | ||
| ); | ||
|
|
||
| return d; | ||
| } | ||
|
|
||
| function fixedDiv(int256 a, int256 b) internal pure returns (int256) { | ||
| require( | ||
| b != 0, | ||
| "FixedPointMath.fixedDiv: DIVIDED_BY_ZERO" | ||
| ); | ||
|
|
||
| if (a == 0) return 0; | ||
|
|
||
| // normalize (multiply by MULTIPLICATOR) | ||
| int256 c = a * int256(MULTIPLICATOR); | ||
| require( | ||
| c / a == int256(MULTIPLICATOR), | ||
| "FixedPointMath.fixedDiv: OVERFLOW_DETECTED" | ||
| ); | ||
|
|
||
| require( | ||
| !(b == -1 && a == INT256_MIN), | ||
| "FixedPointMath.fixedDiv: OVERFLOW_DETECTED" | ||
| ); | ||
|
|
||
| int256 d = c / b; | ||
| require( | ||
| d != 0, | ||
| "FixedPointMath.fixedDiv: CANNOT_REPRESENT_GRANULARITY" | ||
| ); | ||
|
|
||
| return d; | ||
| } | ||
|
|
||
| /** | ||
| * @dev Returns the smallest of two signed numbers. | ||
| */ | ||
| function min(int256 a, int256 b) internal pure returns (int256) { | ||
| return a <= b ? a : b; | ||
| } | ||
|
|
||
| /** | ||
| * @dev Returns the largest of two signed numbers. | ||
| */ | ||
| function max(int256 a, int256 b) internal pure returns (int256) { | ||
| return a >= b ? a : b; | ||
| } | ||
| } |
Oops, something went wrong.