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-rw-r--r--packages/contracts/src/contracts/current/test/TestLibMem/TestLibMem.sol27
-rw-r--r--packages/contracts/test/libraries/lib_mem.ts42
2 files changed, 64 insertions, 5 deletions
diff --git a/packages/contracts/src/contracts/current/test/TestLibMem/TestLibMem.sol b/packages/contracts/src/contracts/current/test/TestLibMem/TestLibMem.sol
index 0c6f8fbc9..18deede4c 100644
--- a/packages/contracts/src/contracts/current/test/TestLibMem/TestLibMem.sol
+++ b/packages/contracts/src/contracts/current/test/TestLibMem/TestLibMem.sol
@@ -19,12 +19,33 @@
pragma solidity ^0.4.24;
import "../../utils/LibMem/LibMem.sol";
-import "../../utils/LibBytes/LibBytes.sol";
contract TestLibMem is
- LibMem,
- LibBytes
+ LibMem
{
+ function testMemcpy(
+ bytes mem, ///< Memory contents we want to apply memcpy to
+ 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;
+ }
function test1()
external
diff --git a/packages/contracts/test/libraries/lib_mem.ts b/packages/contracts/test/libraries/lib_mem.ts
index 6ce4ab9b6..c884d5fea 100644
--- a/packages/contracts/test/libraries/lib_mem.ts
+++ b/packages/contracts/test/libraries/lib_mem.ts
@@ -18,6 +18,14 @@ chaiSetup.configure();
const expect = chai.expect;
const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+// BUG: Ideally we would use Buffer.from(memory).toString('hex')
+// https://github.com/Microsoft/TypeScript/issues/23155
+const toHex = (buf: Uint8Array): string =>
+ buf.reduce((a, v) => a + ('00' + v.toString(16)).slice(-2), '0x');
+
+const fromHex = (str: string): Uint8Array =>
+ Uint8Array.from(Buffer.from(str.slice(2), 'hex'));
+
describe('LibMem', () => {
let owner: string;
let testLibMem: TestLibMemContract;
@@ -36,7 +44,37 @@ describe('LibMem', () => {
await blockchainLifecycle.revertAsync();
});
- describe('LibMem', () => {
+ describe('memcpy', () => {
+
+ // Create memory 0x000102...FF
+ const memSize = 256;
+ const memory = (new Uint8Array(memSize)).map((_, i) => i);
+ const memHex = toHex(memory);
+
+ // Reference implementation to test against
+ const refMemcpy = (mem: Uint8Array, dest: number, source: number, length: number): Uint8Array =>
+ Uint8Array.from(memory).copyWithin(dest, source, source + length);
+
+ // Test vectors: destination, source, length, job description
+ const tests: Array<[number, number, number, string]> = [
+ [1, 5, 4, 'four bytes within one word'],
+ ];
+
+ // Construct test cases
+ tests.forEach(([dest, source, length, job]) =>
+ it(`copies ${job}`, async () => {
+ const expected = refMemcpy(memory, dest, source, length);
+ const resultStr = await testLibMem.testMemcpy.callAsync(
+ memHex,
+ new BigNumber(dest),
+ new BigNumber(source),
+ new BigNumber(length),
+ );
+ const result = fromHex(resultStr);
+ expect(result).to.deep.equal(expected);
+ }),
+ );
+
it('should )', async () => {
await testLibMem.test1.sendTransactionAsync();
});
@@ -62,7 +100,7 @@ describe('LibMem', () => {
});
it('should )', async () => {
- return expect(testLibMem.test7.sendTransactionAsync()).to.be.rejectedWith(constants.REVERT);
+ return expect(testLibMem.test7.sendTransactionAsync()).to.be.rejectedWith(constants.REVERT );
});
});
});