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23 lines
823 B
23 lines
823 B
6 years ago
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pragma solidity ^0.4.0;
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// taken from https://solidity.readthedocs.io/en/v0.4.25/assembly.html
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library GetCode {
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function at(address _addr) public view returns (bytes o_code) {
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assembly {
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// retrieve the size of the code, this needs assembly
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let size := extcodesize(_addr)
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// allocate output byte array - this could also be done without assembly
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// by using o_code = new bytes(size)
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o_code := mload(0x40)
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// new "memory end" including padding
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mstore(0x40, add(o_code, and(add(add(size, 0x20), 0x1f), not(0x1f))))
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// store length in memory
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mstore(o_code, size)
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// actually retrieve the code, this needs assembly
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extcodecopy(_addr, add(o_code, 0x20), 0, size)
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}
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}
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}
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