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/*
Copyright 2018 ZeroEx Intl.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
pragma solidity ^0.4.24;
import "../../utils/LibMem/LibMem.sol";
contract TestLibMem is
LibMem
{
/// @dev Copies a block of memory from one location to another.
/// @param mem Memory contents we want to apply memcpy to
/// @param dest Destination offset into <mem>.
/// @param source Source offset into <mem>.
/// @param length Length of bytes to copy from <source> to <dest>
/// @return mem Memory contents after calling memcpy.
function testMemcpy(
bytes mem,
uint256 dest,
uint256 source,
uint256 length
)
public // not external, we need input in memory
pure
returns (bytes)
{
// Sanity check. Overflows are not checked.
require(source + length <= mem.length);
require(dest + length <= mem.length);
// Get pointer to memory contents
uint256 offset = getMemAddress(mem) + 32;
// Execute memcpy adjusted for memory array location
memcpy(offset + dest, offset + source, length);
// Return modified memory contents
return mem;
}
}
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