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'use strict';
const common = require('../common');
const assert = require('assert');
[-1, 10].forEach((offset) => {
assert.throws(
() => Buffer.alloc(9).write('foo', offset),
{
code: 'ERR_OUT_OF_RANGE',
name: 'RangeError',
message: 'The value of "offset" is out of range. ' +
`It must be >= 0 && <= 9. Received ${offset}`
}
);
});
const resultMap = new Map([
['utf8', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
['ucs2', Buffer.from([102, 0, 111, 0, 111, 0, 0, 0, 0])],
['ascii', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
['latin1', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
['binary', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
['utf16le', Buffer.from([102, 0, 111, 0, 111, 0, 0, 0, 0])],
['base64', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])],
['hex', Buffer.from([102, 111, 111, 0, 0, 0, 0, 0, 0])]
]);
// utf8, ucs2, ascii, latin1, utf16le
const encodings = ['utf8', 'utf-8', 'ucs2', 'ucs-2', 'ascii', 'latin1',
'binary', 'utf16le', 'utf-16le'];
encodings
.reduce((es, e) => es.concat(e, e.toUpperCase()), [])
.forEach((encoding) => {
const buf = Buffer.alloc(9);
const len = Buffer.byteLength('foo', encoding);
assert.strictEqual(buf.write('foo', 0, len, encoding), len);
if (encoding.includes('-'))
encoding = encoding.replace('-', '');
assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
});
// base64
['base64', 'BASE64'].forEach((encoding) => {
const buf = Buffer.alloc(9);
const len = Buffer.byteLength('Zm9v', encoding);
assert.strictEqual(buf.write('Zm9v', 0, len, encoding), len);
assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
});
// hex
['hex', 'HEX'].forEach((encoding) => {
const buf = Buffer.alloc(9);
const len = Buffer.byteLength('666f6f', encoding);
assert.strictEqual(buf.write('666f6f', 0, len, encoding), len);
assert.deepStrictEqual(buf, resultMap.get(encoding.toLowerCase()));
});
// Invalid encodings
for (let i = 1; i < 10; i++) {
const encoding = String(i).repeat(i);
const error = common.expectsError({
code: 'ERR_UNKNOWN_ENCODING',
type: TypeError,
message: `Unknown encoding: ${encoding}`
});
assert.ok(!Buffer.isEncoding(encoding));
assert.throws(() => Buffer.alloc(9).write('foo', encoding), error);
}
// UCS-2 overflow CVE-2018-12115
for (let i = 1; i < 4; i++) {
// Allocate two Buffers sequentially off the pool. Run more than once in case
// we hit the end of the pool and don't get sequential allocations
const x = Buffer.allocUnsafe(4).fill(0);
const y = Buffer.allocUnsafe(4).fill(1);
// Should not write anything, pos 3 doesn't have enough room for a 16-bit char
assert.strictEqual(x.write('ыыыыыы', 3, 'ucs2'), 0);
// CVE-2018-12115 experienced via buffer overrun to next block in the pool
assert.strictEqual(Buffer.compare(y, Buffer.alloc(4, 1)), 0);
}
// Should not write any data when there is no space for 16-bit chars
const z = Buffer.alloc(4, 0);
assert.strictEqual(z.write('\u0001', 3, 'ucs2'), 0);
assert.strictEqual(Buffer.compare(z, Buffer.alloc(4, 0)), 0);
// Large overrun could corrupt the process
assert.strictEqual(Buffer.alloc(4)
.write('ыыыыыы'.repeat(100), 3, 'utf16le'), 0);
{
// .write() does not affect the byte after the written-to slice of the Buffer.
// Refs: https://github.com/nodejs/node/issues/26422
const buf = Buffer.alloc(8);
assert.strictEqual(buf.write('ыы', 1, 'utf16le'), 4);
assert.deepStrictEqual([...buf], [0, 0x4b, 0x04, 0x4b, 0x04, 0, 0, 0]);
}
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