diff options
Diffstat (limited to 'packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol')
-rw-r--r-- | packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol b/packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol index 6f1898acd..d9b246b29 100644 --- a/packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol +++ b/packages/contracts/src/contracts/current/test/TestLibBytes/TestLibBytes.sol @@ -221,4 +221,34 @@ contract TestLibBytes is writeBytes(b, index, input); return b; } + + /// @dev Copies a block of memory from one location to another. + /// @param mem Memory contents we want to apply memCopy 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 memCopy. + 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 memCopy adjusted for memory array location + memCopy(offset + dest, offset + source, length); + + // Return modified memory contents + return mem; + } } |