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'use strict';
require('../common');
const assert = require('assert');
assert.strictEqual(0, Buffer.from('hello', 'utf8').slice(0, 0).length);
assert.strictEqual(0, Buffer('hello', 'utf8').slice(0, 0).length);
const buf = Buffer.from('0123456789', 'utf8');
assert.strictEqual(0, Buffer.compare(buf.slice(-10, 10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-20, 10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-20, -10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, 0),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(undefined),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('foobar'),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(undefined, undefined),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(2),
Buffer.from('23456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(5),
Buffer.from('56789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(5, 8),
Buffer.from('567', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(8, -1),
Buffer.from('8', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -9),
Buffer.from('0', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -1),
Buffer.from('012345678', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(2, -2),
Buffer.from('234567', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, 65536),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(65536, 0),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-5, -8),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-5, -3),
Buffer.from('56', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-10, 10),
Buffer.from('0123456789', 'utf8')));
for (let i = 0, s = buf; i < buf.length; ++i) {
assert.strictEqual(0, Buffer.compare(buf.slice(i), s.slice(i)));
assert.strictEqual(0, Buffer.compare(buf.slice(0, i), s.slice(0, i)));
assert.strictEqual(0, Buffer.compare(buf.slice(-i), s.slice(-i)));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -i), s.slice(0, -i)));
}
const utf16Buf = Buffer.from('0123456789', 'utf16le');
assert.deepStrictEqual(utf16Buf.slice(0, 6), Buffer.from('012', 'utf16le'));
assert.strictEqual(0, Buffer.compare(buf.slice('0', '1'),
Buffer.from('0', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-5', '10'),
Buffer.from('56789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '10'),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '-5'),
Buffer.from('01234', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '-0'),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('111'),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('0', '-111'),
Buffer.from('', 'utf8')));
// try to slice a zero length Buffer
// see https://github.com/joyent/node/issues/5881
assert.doesNotThrow(() => Buffer.alloc(0).slice(0, 1));
assert.strictEqual(Buffer.alloc(0).slice(0, 1).length, 0);
{
// Single argument slice
assert.strictEqual('bcde',
Buffer.from('abcde', 'utf8').slice(1).toString('utf8'));
}
// slice(0,0).length === 0
assert.strictEqual(0, Buffer.from('hello', 'utf8').slice(0, 0).length);
{
// Regression tests for https://github.com/nodejs/node/issues/9096
const buf = Buffer.from('abcd', 'utf8');
assert.strictEqual(buf.slice(buf.length / 3).toString('utf8'), 'bcd');
assert.strictEqual(
buf.slice(buf.length / 3, buf.length).toString(),
'bcd'
);
}
{
const buf = Buffer.from('abcdefg', 'utf8');
assert.strictEqual(buf.slice(-(-1 >>> 0) - 1).toString('utf8'),
buf.toString('utf8'));
}
{
const buf = Buffer.from('abc', 'utf8');
assert.strictEqual(buf.slice(-0.5).toString('utf8'), buf.toString('utf8'));
}
{
const buf = Buffer.from([
1, 29, 0, 0, 1, 143, 216, 162, 92, 254, 248, 63, 0,
0, 0, 18, 184, 6, 0, 175, 29, 0, 8, 11, 1, 0, 0
]);
const chunk1 = Buffer.from([
1, 29, 0, 0, 1, 143, 216, 162, 92, 254, 248, 63, 0
]);
const chunk2 = Buffer.from([
0, 0, 18, 184, 6, 0, 175, 29, 0, 8, 11, 1, 0, 0
]);
const middle = buf.length / 2;
assert.deepStrictEqual(buf.slice(0, middle), chunk1);
assert.deepStrictEqual(buf.slice(middle), chunk2);
}
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