eth-interface

EIP-165 interface and tools for chainlib-eth
git clone git://holbrook.no/eth-interface.git
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Interface.sol (670B)

      1 pragma solidity >= 0.8.0;
      2 
      3 // SPDX-License-Identifier: GPL-3.0-or-later
      4 
      5 contract InterfaceCheckSample {
      6 	uint256 interfaces;
      7 
      8 	constructor(uint256 _interfaces) {
      9 		interfaces = _interfaces;	
     10 	}
     11 
     12 	// EIP-165
     13 	function supportsInterface(bytes4 interfaceID) external view returns (bool) {
     14 		uint32 interfaceN;
     15 		uint32 masked;
     16 
     17 		interfaceN = uint32(interfaceID);
     18 
     19 		// EIP165 interface id
     20 		if (uint32(interfaceID) == 0x01ffc9a7) {
     21 			return true;
     22 		}
     23 
     24 		for (uint256 i = 0; i < 256; i += 32) {
     25 			masked = uint32((interfaces >> i) & 0xffffffff);
     26 			if (masked == 0) {
     27 				return false;
     28 			}
     29 			if (interfaceN == masked) {
     30 				return true;
     31 			}
     32 		}
     33 
     34 		return false;
     35 	}
     36 }