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import { BigNumber } from '@0xproject/utils';
import * as chai from 'chai';
import { TestLibMemContract } from '../../src/generated_contract_wrappers/test_lib_mem';
import { artifacts } from '../../src/utils/artifacts';
import { chaiSetup } from '../../src/utils/chai_setup';
import { provider, txDefaults } from '../../src/utils/web3_wrapper';
chaiSetup.configure();
const expect = chai.expect;
// 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 testLibMem: TestLibMemContract;
before(async () => {
// Deploy TestLibMem
testLibMem = await TestLibMemContract.deployFrom0xArtifactAsync(artifacts.TestLibMem, provider, txDefaults);
});
describe('memCopy', () => {
// 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
type Tests = Array<[number, number, number, string]>;
const test = (tests: Tests) =>
tests.forEach(([dest, source, length, job]) =>
it(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);
}),
);
test([[0, 0, 0, 'copies zero bytes with overlap']]);
describe('copies forward', () =>
test([
[128, 0, 0, 'zero bytes'],
[128, 0, 1, 'one byte'],
[128, 0, 11, 'eleven bytes'],
[128, 0, 31, 'thirty-one bytes'],
[128, 0, 32, 'one word'],
[128, 0, 64, 'two words'],
[128, 0, 96, 'three words'],
[128, 0, 33, 'one word and one byte'],
[128, 0, 72, 'two words and eight bytes'],
[128, 0, 100, 'three words and four bytes'],
]));
describe('copies forward within one word', () =>
test([
[16, 0, 0, 'zero bytes'],
[16, 0, 1, 'one byte'],
[16, 0, 11, 'eleven bytes'],
[16, 0, 16, 'sixteen bytes'],
]));
describe('copies forward with one byte overlap', () =>
test([
[0, 0, 1, 'one byte'],
[10, 0, 11, 'eleven bytes'],
[30, 0, 31, 'thirty-one bytes'],
[31, 0, 32, 'one word'],
[32, 0, 33, 'one word and one byte'],
[71, 0, 72, 'two words and eight bytes'],
[99, 0, 100, 'three words and four bytes'],
]));
describe('copies forward with thirty-one bytes overlap', () =>
test([
[0, 0, 31, 'thirty-one bytes'],
[1, 0, 32, 'one word'],
[2, 0, 33, 'one word and one byte'],
[41, 0, 72, 'two words and eight bytes'],
[69, 0, 100, 'three words and four bytes'],
]));
describe('copies forward with one word overlap', () =>
test([
[0, 0, 32, 'one word'],
[1, 0, 33, 'one word and one byte'],
[41, 0, 72, 'two words and eight bytes'],
[69, 0, 100, 'three words and four bytes'],
]));
describe('copies forward with one word and one byte overlap', () =>
test([
[0, 0, 33, 'one word and one byte'],
[40, 0, 72, 'two words and eight bytes'],
[68, 0, 100, 'three words and four bytes'],
]));
describe('copies forward with two words overlap', () =>
test([
[0, 0, 64, 'two words'],
[8, 0, 72, 'two words and eight bytes'],
[36, 0, 100, 'three words and four bytes'],
]));
describe('copies forward within one word and one byte overlap', () =>
test([[0, 0, 1, 'one byte'], [10, 0, 11, 'eleven bytes'], [15, 0, 16, 'sixteen bytes']]));
describe('copies backward', () =>
test([
[0, 128, 0, 'zero bytes'],
[0, 128, 1, 'one byte'],
[0, 128, 11, 'eleven bytes'],
[0, 128, 31, 'thirty-one bytes'],
[0, 128, 32, 'one word'],
[0, 128, 64, 'two words'],
[0, 128, 96, 'three words'],
[0, 128, 33, 'one word and one byte'],
[0, 128, 72, 'two words and eight bytes'],
[0, 128, 100, 'three words and four bytes'],
]));
describe('copies backward within one word', () =>
test([
[0, 16, 0, 'zero bytes'],
[0, 16, 1, 'one byte'],
[0, 16, 11, 'eleven bytes'],
[0, 16, 16, 'sixteen bytes'],
]));
describe('copies backward with one byte overlap', () =>
test([
[0, 0, 1, 'one byte'],
[0, 10, 11, 'eleven bytes'],
[0, 30, 31, 'thirty-one bytes'],
[0, 31, 32, 'one word'],
[0, 32, 33, 'one word and one byte'],
[0, 71, 72, 'two words and eight bytes'],
[0, 99, 100, 'three words and four bytes'],
]));
describe('copies backward with thirty-one bytes overlap', () =>
test([
[0, 0, 31, 'thirty-one bytes'],
[0, 1, 32, 'one word'],
[0, 2, 33, 'one word and one byte'],
[0, 41, 72, 'two words and eight bytes'],
[0, 69, 100, 'three words and four bytes'],
]));
describe('copies backward with one word overlap', () =>
test([
[0, 0, 32, 'one word'],
[0, 1, 33, 'one word and one byte'],
[0, 41, 72, 'two words and eight bytes'],
[0, 69, 100, 'three words and four bytes'],
]));
describe('copies backward with one word and one byte overlap', () =>
test([
[0, 0, 33, 'one word and one byte'],
[0, 40, 72, 'two words and eight bytes'],
[0, 68, 100, 'three words and four bytes'],
]));
describe('copies backward with two words overlap', () =>
test([
[0, 0, 64, 'two words'],
[0, 8, 72, 'two words and eight bytes'],
[0, 36, 100, 'three words and four bytes'],
]));
describe('copies forward within one word and one byte overlap', () =>
test([[0, 0, 1, 'one byte'], [0, 10, 11, 'eleven bytes'], [0, 15, 16, 'sixteen bytes']]));
});
});
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