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genericschemeMultipleCalls - fix warnings (#787)
* fix warnings * remove pragma experimental
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /* | ||
| * @title Solidity Bytes Arrays Utils | ||
| * @author Gonçalo Sá <[email protected]> | ||
| * | ||
| * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity. | ||
| * The library lets you concatenate, slice and type cast bytes arrays both in memory and storage. | ||
| */ | ||
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| pragma solidity 0.5.17; | ||
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| library BytesLib { | ||
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| function slice( | ||
| bytes memory _bytes, | ||
| uint _start, | ||
| uint _length | ||
| ) | ||
| internal | ||
| pure | ||
| returns (bytes memory) | ||
| // solhint-disable-next-line function-max-lines | ||
| { | ||
| require(_bytes.length >= (_start + _length)); | ||
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| bytes memory tempBytes; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly { | ||
| switch iszero(_length) | ||
| case 0 { | ||
| // Get a location of some free memory and store it in tempBytes as | ||
| // Solidity does for memory variables. | ||
| tempBytes := mload(0x40) | ||
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| // The first word of the slice result is potentially a partial | ||
| // word read from the original array. To read it, we calculate | ||
| // the length of that partial word and start copying that many | ||
| // bytes into the array. The first word we copy will start with | ||
| // data we don't care about, but the last `lengthmod` bytes will | ||
| // land at the beginning of the contents of the new array. When | ||
| // we're done copying, we overwrite the full first word with | ||
| // the actual length of the slice. | ||
| let lengthmod := and(_length, 31) | ||
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| // The multiplication in the next line is necessary | ||
| // because when slicing multiples of 32 bytes (lengthmod == 0) | ||
| // the following copy loop was copying the origin's length | ||
| // and then ending prematurely not copying everything it should. | ||
| let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod))) | ||
| let end := add(mc, _length) | ||
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| for { | ||
| // The multiplication in the next line has the same exact purpose | ||
| // as the one above. | ||
| let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start) | ||
| } lt(mc, end) { | ||
| mc := add(mc, 0x20) | ||
| cc := add(cc, 0x20) | ||
| } { | ||
| mstore(mc, mload(cc)) | ||
| } | ||
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| mstore(tempBytes, _length) | ||
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| //update free-memory pointer | ||
| //allocating the array padded to 32 bytes like the compiler does now | ||
| mstore(0x40, and(add(mc, 31), not(31))) | ||
| } | ||
| //if we want a zero-length slice let's just return a zero-length array | ||
| default { | ||
| tempBytes := mload(0x40) | ||
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| mstore(0x40, add(tempBytes, 0x20)) | ||
| } | ||
| } | ||
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| return tempBytes; | ||
| } | ||
| } |
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