'use strict';

const common = require('../common');

const assert = require('assert');

const vm = require('vm');

const SlowBuffer = require('buffer').SlowBuffer;

// Verify the maximum Uint8Array size. There is no concrete limit by spec. The

// internal limits should be updated if this fails.

assert.throws(

() => new Uint8Array(2 ** 32 + 1),

{ message: 'Invalid typed array length: 4294967297' }

);

const b = Buffer.allocUnsafe(1024);

assert.strictEqual(b.length, 1024);

b[0] = -1;

assert.strictEqual(b[0], 255);

for (let i = 0; i < 1024; i++) {

b[i] = i % 256;

}

for (let i = 0; i < 1024; i++) {

assert.strictEqual(i % 256, b[i]);

}

const c = Buffer.allocUnsafe(512);

assert.strictEqual(c.length, 512);

const d = Buffer.from([]);

assert.strictEqual(d.length, 0);

// Test offset properties

{

const b = Buffer.alloc(128);

assert.strictEqual(b.length, 128);

assert.strictEqual(b.byteOffset, 0);

assert.strictEqual(b.offset, 0);

}

// Test creating a Buffer from a Uint32Array

{

const ui32 = new Uint32Array(4).fill(42);

const e = Buffer.from(ui32);

for (const [index, value] of e.entries()) {

assert.strictEqual(value, ui32[index]);

}

}

// Test creating a Buffer from a Uint32Array (old constructor)

{

const ui32 = new Uint32Array(4).fill(42);

const e = Buffer(ui32);

for (const [key, value] of e.entries()) {

assert.deepStrictEqual(value, ui32[key]);

}

}

// Test invalid encoding for Buffer.toString

assert.throws(() => b.toString('invalid'),

/Unknown encoding: invalid/);

// Invalid encoding for Buffer.write

assert.throws(() => b.write('test string', 0, 5, 'invalid'),

/Unknown encoding: invalid/);

// Unsupported arguments for Buffer.write

assert.throws(() => b.write('test', 'utf8', 0),

{ code: 'ERR_INVALID_ARG_TYPE' });

// Try to create 0-length buffers. Should not throw.

Buffer.from('');

Buffer.from('', 'ascii');

Buffer.from('', 'latin1');

Buffer.alloc(0);

Buffer.allocUnsafe(0);

new Buffer('');

new Buffer('', 'ascii');

new Buffer('', 'latin1');

new Buffer('', 'binary');

Buffer(0);

const outOfRangeError = {

code: 'ERR_OUT_OF_RANGE',

name: 'RangeError'

};

// Try to write a 0-length string beyond the end of b

assert.throws(() => b.write('', 2048), outOfRangeError);

// Throw when writing to negative offset

assert.throws(() => b.write('a', -1), outOfRangeError);

// Throw when writing past bounds from the pool

assert.throws(() => b.write('a', 2048), outOfRangeError);

// Throw when writing to negative offset

assert.throws(() => b.write('a', -1), outOfRangeError);

// Try to copy 0 bytes worth of data into an empty buffer

b.copy(Buffer.alloc(0), 0, 0, 0);

// Try to copy 0 bytes past the end of the target buffer

b.copy(Buffer.alloc(0), 1, 1, 1);

b.copy(Buffer.alloc(1), 1, 1, 1);

// Try to copy 0 bytes from past the end of the source buffer

b.copy(Buffer.alloc(1), 0, 2048, 2048);

// Testing for smart defaults and ability to pass string values as offset

{

const writeTest = Buffer.from('abcdes');

writeTest.write('n', 'ascii');

assert.throws(

() => writeTest.write('o', '1', 'ascii'),

{ code: 'ERR_INVALID_ARG_TYPE' }

);

writeTest.write('o', 1, 'ascii');

writeTest.write('d', 2, 'ascii');

writeTest.write('e', 3, 'ascii');

writeTest.write('j', 4, 'ascii');

assert.strictEqual(writeTest.toString(), 'nodejs');

}

// Offset points to the end of the buffer and does not throw.

// (see https://github.com/nodejs/node/issues/8127).

Buffer.alloc(1).write('', 1, 0);

// ASCII slice test

{

const asciiString = 'hello world';

for (let i = 0; i < asciiString.length; i++) {

b[i] = asciiString.charCodeAt(i);

}

const asciiSlice = b.toString('ascii', 0, asciiString.length);

assert.strictEqual(asciiString, asciiSlice);

}

{

const asciiString = 'hello world';

const offset = 100;

assert.strictEqual(asciiString.length, b.write(asciiString, offset, 'ascii'));

const asciiSlice = b.toString('ascii', offset, offset + asciiString.length);

assert.strictEqual(asciiString, asciiSlice);

}

{

const asciiString = 'hello world';

const offset = 100;

const sliceA = b.slice(offset, offset + asciiString.length);

const sliceB = b.slice(offset, offset + asciiString.length);

for (let i = 0; i < asciiString.length; i++) {

assert.strictEqual(sliceA[i], sliceB[i]);

}

}

// UTF-8 slice test

{

const utf8String = '¡hέlló wôrld!';

const offset = 100;

b.write(utf8String, 0, Buffer.byteLength(utf8String), 'utf8');

let utf8Slice = b.toString('utf8', 0, Buffer.byteLength(utf8String));

assert.strictEqual(utf8String, utf8Slice);

assert.strictEqual(Buffer.byteLength(utf8String),

b.write(utf8String, offset, 'utf8'));

utf8Slice = b.toString('utf8', offset,

offset + Buffer.byteLength(utf8String));

assert.strictEqual(utf8String, utf8Slice);

const sliceA = b.slice(offset, offset + Buffer.byteLength(utf8String));

const sliceB = b.slice(offset, offset + Buffer.byteLength(utf8String));

for (let i = 0; i < Buffer.byteLength(utf8String); i++) {

assert.strictEqual(sliceA[i], sliceB[i]);

}

}

{

const slice = b.slice(100, 150);

assert.strictEqual(slice.length, 50);

for (let i = 0; i < 50; i++) {

assert.strictEqual(b[100 + i], slice[i]);

}

}

{

// Make sure only top level parent propagates from allocPool

const b = Buffer.allocUnsafe(5);

const c = b.slice(0, 4);

const d = c.slice(0, 2);

assert.strictEqual(b.parent, c.parent);

assert.strictEqual(b.parent, d.parent);

}

{

// Also from a non-pooled instance

const b = Buffer.allocUnsafeSlow(5);

const c = b.slice(0, 4);

const d = c.slice(0, 2);

assert.strictEqual(c.parent, d.parent);

}

{

// Bug regression test

const testValue = '\u00F6\u65E5\u672C\u8A9E'; // ö日本語

const buffer = Buffer.allocUnsafe(32);

const size = buffer.write(testValue, 0, 'utf8');

const slice = buffer.toString('utf8', 0, size);

assert.strictEqual(slice, testValue);

}

{

// Test triple slice

const a = Buffer.allocUnsafe(8);

for (let i = 0; i < 8; i++) a[i] = i;

const b = a.slice(4, 8);

assert.strictEqual(b[0], 4);

assert.strictEqual(b[1], 5);

assert.strictEqual(b[2], 6);

assert.strictEqual(b[3], 7);

const c = b.slice(2, 4);

assert.strictEqual(c[0], 6);

assert.strictEqual(c[1], 7);

}

{

const d = Buffer.from([23, 42, 255]);

assert.strictEqual(d.length, 3);

assert.strictEqual(d[0], 23);

assert.strictEqual(d[1], 42);

assert.strictEqual(d[2], 255);

assert.deepStrictEqual(d, Buffer.from(d));

}

{

// Test for proper UTF-8 Encoding

const e = Buffer.from('über');

assert.deepStrictEqual(e, Buffer.from([195, 188, 98, 101, 114]));

}

{

// Test for proper ascii Encoding, length should be 4

const f = Buffer.from('über', 'ascii');

assert.deepStrictEqual(f, Buffer.from([252, 98, 101, 114]));

}

['ucs2', 'ucs-2', 'utf16le', 'utf-16le'].forEach((encoding) => {

{

// Test for proper UTF16LE encoding, length should be 8

const f = Buffer.from('über', encoding);

assert.deepStrictEqual(f, Buffer.from([252, 0, 98, 0, 101, 0, 114, 0]));

}

{

// Length should be 12

const f = Buffer.from('привет', encoding);

assert.deepStrictEqual(

f, Buffer.from([63, 4, 64, 4, 56, 4, 50, 4, 53, 4, 66, 4])

);

assert.strictEqual(f.toString(encoding), 'привет');

}

{

const f = Buffer.from([0, 0, 0, 0, 0]);

assert.strictEqual(f.length, 5);

const size = f.write('あいうえお', encoding);

assert.strictEqual(size, 4);

assert.deepStrictEqual(f, Buffer.from([0x42, 0x30, 0x44, 0x30, 0x00]));

}

});

{

const f = Buffer.from('\uD83D\uDC4D', 'utf-16le'); // THUMBS UP SIGN (U+1F44D)

assert.strictEqual(f.length, 4);

assert.deepStrictEqual(f, Buffer.from('3DD84DDC', 'hex'));

}

// Test construction from arrayish object

{

const arrayIsh = { 0: 0, 1: 1, 2: 2, 3: 3, length: 4 };

let g = Buffer.from(arrayIsh);

assert.deepStrictEqual(g, Buffer.from([0, 1, 2, 3]));

const strArrayIsh = { 0: '0', 1: '1', 2: '2', 3: '3', length: 4 };

g = Buffer.from(strArrayIsh);

assert.deepStrictEqual(g, Buffer.from([0, 1, 2, 3]));

}

//

// Test toString('base64')

//

assert.strictEqual((Buffer.from('Man')).toString('base64'), 'TWFu');

assert.strictEqual((Buffer.from('Woman')).toString('base64'), 'V29tYW4=');

//

// Test toString('base64url')

//

assert.strictEqual((Buffer.from('Man')).toString('base64url'), 'TWFu');

assert.strictEqual((Buffer.from('Woman')).toString('base64url'), 'V29tYW4');

{

// Test that regular and URL-safe base64 both work both ways

const expected = [0xff, 0xff, 0xbe, 0xff, 0xef, 0xbf, 0xfb, 0xef, 0xff];

assert.deepStrictEqual(Buffer.from('//++/++/++//', 'base64'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('__--_--_--__', 'base64'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('//++/++/++//', 'base64url'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('__--_--_--__', 'base64url'),

Buffer.from(expected));

}

const base64flavors = ['base64', 'base64url'];

{

// Test that regular and URL-safe base64 both work both ways with padding

const expected = [0xff, 0xff, 0xbe, 0xff, 0xef, 0xbf, 0xfb, 0xef, 0xff, 0xfb];

assert.deepStrictEqual(Buffer.from('//++/++/++//+w==', 'base64'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('//++/++/++//+w==', 'base64'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('//++/++/++//+w==', 'base64url'),

Buffer.from(expected));

assert.deepStrictEqual(Buffer.from('//++/++/++//+w==', 'base64url'),

Buffer.from(expected));

}

{

// big example

const quote = 'Man is distinguished, not only by his reason, but by this ' +

'singular passion from other animals, which is a lust ' +

'of the mind, that by a perseverance of delight in the ' +

'continued and indefatigable generation of knowledge, ' +

'exceeds the short vehemence of any carnal pleasure.';

const expected = 'TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb' +

'24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlci' +

'BhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQ' +

'gYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu' +

'dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZ' +

'GdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm' +

'5hbCBwbGVhc3VyZS4=';

assert.strictEqual(Buffer.from(quote).toString('base64'), expected);

assert.strictEqual(

Buffer.from(quote).toString('base64url'),

expected.replaceAll('+', '-').replaceAll('/', '_').replaceAll('=', '')

);

base64flavors.forEach((encoding) => {

let b = Buffer.allocUnsafe(1024);

let bytesWritten = b.write(expected, 0, encoding);

assert.strictEqual(quote.length, bytesWritten);

assert.strictEqual(quote, b.toString('ascii', 0, quote.length));

// Check that the base64 decoder ignores whitespace

const expectedWhite = `${expected.slice(0, 60)} \n` +

`${expected.slice(60, 120)} \n` +

`${expected.slice(120, 180)} \n` +

`${expected.slice(180, 240)} \n` +

`${expected.slice(240, 300)}\n` +

`${expected.slice(300, 360)}\n`;

b = Buffer.allocUnsafe(1024);

bytesWritten = b.write(expectedWhite, 0, encoding);

assert.strictEqual(quote.length, bytesWritten);

assert.strictEqual(quote, b.toString('ascii', 0, quote.length));

// Check that the base64 decoder on the constructor works

// even in the presence of whitespace.

b = Buffer.from(expectedWhite, encoding);

assert.strictEqual(quote.length, b.length);

assert.strictEqual(quote, b.toString('ascii', 0, quote.length));

// Check that the base64 decoder ignores illegal chars

const expectedIllegal = expected.slice(0, 60) + ' \x80' +

expected.slice(60, 120) + ' \xff' +

expected.slice(120, 180) + ' \x00' +

expected.slice(180, 240) + ' \x98' +

expected.slice(240, 300) + '\x03' +

expected.slice(300, 360);

b = Buffer.from(expectedIllegal, encoding);

assert.strictEqual(quote.length, b.length);

assert.strictEqual(quote, b.toString('ascii', 0, quote.length));

});

}

base64flavors.forEach((encoding) => {

assert.strictEqual(Buffer.from('', encoding).toString(), '');

assert.strictEqual(Buffer.from('K', encoding).toString(), '');

// multiple-of-4 with padding

assert.strictEqual(Buffer.from('Kg==', encoding).toString(), '*');

assert.strictEqual(Buffer.from('Kio=', encoding).toString(), '*'.repeat(2));

assert.strictEqual(Buffer.from('Kioq', encoding).toString(), '*'.repeat(3));

assert.strictEqual(

Buffer.from('KioqKg==', encoding).toString(), '*'.repeat(4));

assert.strictEqual(

Buffer.from('KioqKio=', encoding).toString(), '*'.repeat(5));

assert.strictEqual(

Buffer.from('KioqKioq', encoding).toString(), '*'.repeat(6));

assert.strictEqual(Buffer.from('KioqKioqKg==', encoding).toString(),

'*'.repeat(7));

assert.strictEqual(Buffer.from('KioqKioqKio=', encoding).toString(),

'*'.repeat(8));

assert.strictEqual(Buffer.from('KioqKioqKioq', encoding).toString(),

'*'.repeat(9));

assert.strictEqual(Buffer.from('KioqKioqKioqKg==', encoding).toString(),

'*'.repeat(10));

assert.strictEqual(Buffer.from('KioqKioqKioqKio=', encoding).toString(),

'*'.repeat(11));

assert.strictEqual(Buffer.from('KioqKioqKioqKioq', encoding).toString(),

'*'.repeat(12));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKg==', encoding).toString(),

'*'.repeat(13));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKio=', encoding).toString(),

'*'.repeat(14));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKioq', encoding).toString(),

'*'.repeat(15));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKg==', encoding).toString(),

'*'.repeat(16));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKio=', encoding).toString(),

'*'.repeat(17));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKioq', encoding).toString(),

'*'.repeat(18));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKioqKioqKg==',

encoding).toString(),

'*'.repeat(19));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKioqKioqKio=',

encoding).toString(),

'*'.repeat(20));

// No padding, not a multiple of 4

assert.strictEqual(Buffer.from('Kg', encoding).toString(), '*');

assert.strictEqual(Buffer.from('Kio', encoding).toString(), '*'.repeat(2));

assert.strictEqual(Buffer.from('KioqKg', encoding).toString(), '*'.repeat(4));

assert.strictEqual(

Buffer.from('KioqKio', encoding).toString(), '*'.repeat(5));

assert.strictEqual(Buffer.from('KioqKioqKg', encoding).toString(),

'*'.repeat(7));

assert.strictEqual(Buffer.from('KioqKioqKio', encoding).toString(),

'*'.repeat(8));

assert.strictEqual(Buffer.from('KioqKioqKioqKg', encoding).toString(),

'*'.repeat(10));

assert.strictEqual(Buffer.from('KioqKioqKioqKio', encoding).toString(),

'*'.repeat(11));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKg', encoding).toString(),

'*'.repeat(13));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKio', encoding).toString(),

'*'.repeat(14));

assert.strictEqual(Buffer.from('KioqKioqKioqKioqKioqKg', encoding).toString(),

'*'.repeat(16));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKio', encoding).toString(),

'*'.repeat(17));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKioqKg', encoding).toString(),

'*'.repeat(19));

assert.strictEqual(

Buffer.from('KioqKioqKioqKioqKioqKioqKio', encoding).toString(),

'*'.repeat(20));

});

// Handle padding graciously, multiple-of-4 or not

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw==', 'base64').length,

32

);

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9-VgdGPFJDxUBFR5_rMFsghgxADiw==', 'base64url')

.length,

32

);

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw=', 'base64').length,

32

);

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9-VgdGPFJDxUBFR5_rMFsghgxADiw=', 'base64url')

.length,

32

);

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw', 'base64').length,

32

);

assert.strictEqual(

Buffer.from('72INjkR5fchcxk9-VgdGPFJDxUBFR5_rMFsghgxADiw', 'base64url')

.length,

32

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg==', 'base64').length,

31

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg==', 'base64url')

.length,

31

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg=', 'base64').length,

31

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg=', 'base64url')

.length,

31

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg', 'base64').length,

31

);

assert.strictEqual(

Buffer.from('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg', 'base64url').length,

31

);

{

// This string encodes single '.' character in UTF-16

const dot = Buffer.from('//4uAA==', 'base64');

assert.strictEqual(dot[0], 0xff);

assert.strictEqual(dot[1], 0xfe);

assert.strictEqual(dot[2], 0x2e);

assert.strictEqual(dot[3], 0x00);

assert.strictEqual(dot.toString('base64'), '//4uAA==');

}

{

// This string encodes single '.' character in UTF-16

const dot = Buffer.from('//4uAA', 'base64url');

assert.strictEqual(dot[0], 0xff);

assert.strictEqual(dot[1], 0xfe);

assert.strictEqual(dot[2], 0x2e);

assert.strictEqual(dot[3], 0x00);

assert.strictEqual(dot.toString('base64url'), '__4uAA');

}

{

// Writing base64 at a position > 0 should not mangle the result.

//

// https://github.com/joyent/node/issues/402

const segments = ['TWFkbmVzcz8h', 'IFRoaXM=', 'IGlz', 'IG5vZGUuanMh'];

const b = Buffer.allocUnsafe(64);

let pos = 0;

for (let i = 0; i < segments.length; ++i) {

pos += b.write(segments[i], pos, 'base64');

}

assert.strictEqual(b.toString('latin1', 0, pos),

'Madness?! This is node.js!');

}

{

// Writing base64url at a position > 0 should not mangle the result.

//

// https://github.com/joyent/node/issues/402

const segments = ['TWFkbmVzcz8h', 'IFRoaXM', 'IGlz', 'IG5vZGUuanMh'];

const b = Buffer.allocUnsafe(64);

let pos = 0;

for (let i = 0; i < segments.length; ++i) {

pos += b.write(segments[i], pos, 'base64url');

}

assert.strictEqual(b.toString('latin1', 0, pos),

'Madness?! This is node.js!');

}

// Regression test for https://github.com/nodejs/node/issues/3496.

assert.strictEqual(Buffer.from('=bad'.repeat(1e4), 'base64').length, 0);

// Regression test for https://github.com/nodejs/node/issues/11987.

assert.deepStrictEqual(Buffer.from('w0 ', 'base64'),

Buffer.from('w0', 'base64'));

// Regression test for https://github.com/nodejs/node/issues/13657.

assert.deepStrictEqual(Buffer.from(' YWJvcnVtLg', 'base64'),

Buffer.from('YWJvcnVtLg', 'base64'));

{

// Creating buffers larger than pool size.

const l = Buffer.poolSize + 5;

const s = 'h'.repeat(l);

const b = Buffer.from(s);

for (let i = 0; i < l; i++) {

assert.strictEqual(b[i], 'h'.charCodeAt(0));

}

const sb = b.toString();

assert.strictEqual(sb.length, s.length);

assert.strictEqual(sb, s);

}

{

// test hex toString

const hexb = Buffer.allocUnsafe(256);

for (let i = 0; i < 256; i++) {

hexb[i] = i;

}

const hexStr = hexb.toString('hex');

assert.strictEqual(hexStr,

'000102030405060708090a0b0c0d0e0f' +

'101112131415161718191a1b1c1d1e1f' +

'202122232425262728292a2b2c2d2e2f' +

'303132333435363738393a3b3c3d3e3f' +

'404142434445464748494a4b4c4d4e4f' +

'505152535455565758595a5b5c5d5e5f' +

'606162636465666768696a6b6c6d6e6f' +

'707172737475767778797a7b7c7d7e7f' +

'808182838485868788898a8b8c8d8e8f' +

'909192939495969798999a9b9c9d9e9f' +

'a0a1a2a3a4a5a6a7a8a9aaabacadaeaf' +

'b0b1b2b3b4b5b6b7b8b9babbbcbdbebf' +

'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf' +

'd0d1d2d3d4d5d6d7d8d9dadbdcdddedf' +

'e0e1e2e3e4e5e6e7e8e9eaebecedeeef' +

'f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff');

const hexb2 = Buffer.from(hexStr, 'hex');

for (let i = 0; i < 256; i++) {

assert.strictEqual(hexb2[i], hexb[i]);

}

}

// Test single hex character is discarded.

assert.strictEqual(Buffer.from('A', 'hex').length, 0);

// Test that if a trailing character is discarded, rest of string is processed.

assert.deepStrictEqual(Buffer.from('Abx', 'hex'), Buffer.from('Ab', 'hex'));

// Test single base64 char encodes as 0.

assert.strictEqual(Buffer.from('A', 'base64').length, 0);

{

// Test an invalid slice end.

const b = Buffer.from([1, 2, 3, 4, 5]);

const b2 = b.toString('hex', 1, 10000);

const b3 = b.toString('hex', 1, 5);

const b4 = b.toString('hex', 1);

assert.strictEqual(b2, b3);

assert.strictEqual(b2, b4);

}

function buildBuffer(data) {

if (Array.isArray(data)) {

const buffer = Buffer.allocUnsafe(data.length);

data.forEach((v, k) => buffer[k] = v);

return buffer;

}

return null;

}

const x = buildBuffer([0x81, 0xa3, 0x66, 0x6f, 0x6f, 0xa3, 0x62, 0x61, 0x72]);

assert.strictEqual(x.inspect(), '<Buffer 81 a3 66 6f 6f a3 62 61 72>');

{

const z = x.slice(4);

assert.strictEqual(z.length, 5);

assert.strictEqual(z[0], 0x6f);

assert.strictEqual(z[1], 0xa3);

assert.strictEqual(z[2], 0x62);

assert.strictEqual(z[3], 0x61);

assert.strictEqual(z[4], 0x72);

}

{

const z = x.slice(0);

assert.strictEqual(z.length, x.length);

}

{

const z = x.slice(0, 4);

assert.strictEqual(z.length, 4);

assert.strictEqual(z[0], 0x81);

assert.strictEqual(z[1], 0xa3);

}

{

const z = x.slice(0, 9);

assert.strictEqual(z.length, 9);

}

{

const z = x.slice(1, 4);

assert.strictEqual(z.length, 3);

assert.strictEqual(z[0], 0xa3);

}

{

const z = x.slice(2, 4);

assert.strictEqual(z.length, 2);

assert.strictEqual(z[0], 0x66);

assert.strictEqual(z[1], 0x6f);

}

['ucs2', 'ucs-2', 'utf16le', 'utf-16le'].forEach((encoding) => {

const b = Buffer.allocUnsafe(10);

b.write('あいうえお', encoding);

assert.strictEqual(b.toString(encoding), 'あいうえお');

});

['ucs2', 'ucs-2', 'utf16le', 'utf-16le'].forEach((encoding) => {

const b = Buffer.allocUnsafe(11);

b.write('あいうえお', 1, encoding);

assert.strictEqual(b.toString(encoding, 1), 'あいうえお');

});

{

// latin1 encoding should write only one byte per character.

const b = Buffer.from([0xde, 0xad, 0xbe, 0xef]);

let s = String.fromCharCode(0xffff);

b.write(s, 0, 'latin1');

assert.strictEqual(b[0], 0xff);

assert.strictEqual(b[1], 0xad);

assert.strictEqual(b[2], 0xbe);

assert.strictEqual(b[3], 0xef);

s = String.fromCharCode(0xaaee);

b.write(s, 0, 'latin1');

assert.strictEqual(b[0], 0xee);

assert.strictEqual(b[1], 0xad);

assert.strictEqual(b[2], 0xbe);

assert.strictEqual(b[3], 0xef);

}

{

// Binary encoding should write only one byte per character.

const b = Buffer.from([0xde, 0xad, 0xbe, 0xef]);

let s = String.fromCharCode(0xffff);

b.write(s, 0, 'latin1');

assert.strictEqual(b[0], 0xff);

assert.strictEqual(b[1], 0xad);

assert.strictEqual(b[2], 0xbe);

assert.strictEqual(b[3], 0xef);

s = String.fromCharCode(0xaaee);

b.write(s, 0, 'latin1');

assert.strictEqual(b[0], 0xee);

assert.strictEqual(b[1], 0xad);

assert.strictEqual(b[2], 0xbe);

assert.strictEqual(b[3], 0xef);

}

{

// https://github.com/nodejs/node-v0.x-archive/pull/1210

// Test UTF-8 string includes null character

let buf = Buffer.from('\0');

assert.strictEqual(buf.length, 1);

buf = Buffer.from('\0\0');

assert.strictEqual(buf.length, 2);

}

{

const buf = Buffer.allocUnsafe(2);

assert.strictEqual(buf.write(''), 0); // 0bytes

assert.strictEqual(buf.write('\0'), 1); // 1byte (v8 adds null terminator)

assert.strictEqual(buf.write('a\0'), 2); // 1byte * 2

assert.strictEqual(buf.write('あ'), 0); // 3bytes

assert.strictEqual(buf.write('\0あ'), 1); // 1byte + 3bytes

assert.strictEqual(buf.write('\0\0あ'), 2); // 1byte * 2 + 3bytes

}

{

const buf = Buffer.allocUnsafe(10);

assert.strictEqual(buf.write('あいう'), 9); // 3bytes * 3 (v8 adds null term.)

assert.strictEqual(buf.write('あいう\0'), 10); // 3bytes * 3 + 1byte

}

{

// https://github.com/nodejs/node-v0.x-archive/issues/243

// Test write() with maxLength

const buf = Buffer.allocUnsafe(4);

buf.fill(0xFF);

assert.strictEqual(buf.write('abcd', 1, 2, 'utf8'), 2);

assert.strictEqual(buf[0], 0xFF);

assert.strictEqual(buf[1], 0x61);

assert.strictEqual(buf[2], 0x62);

assert.strictEqual(buf[3], 0xFF);

buf.fill(0xFF);

assert.strictEqual(buf.write('abcd', 1, 4), 3);

assert.strictEqual(buf[0], 0xFF);

assert.strictEqual(buf[1], 0x61);

assert.strictEqual(buf[2], 0x62);

assert.strictEqual(buf[3], 0x63);

buf.fill(0xFF);

assert.strictEqual(buf.write('abcd', 1, 2, 'utf8'), 2);

assert.strictEqual(buf[0], 0xFF);

assert.strictEqual(buf[1], 0x61);

assert.strictEqual(buf[2], 0x62);

assert.strictEqual(buf[3], 0xFF);

buf.fill(0xFF);

assert.strictEqual(buf.write('abcdef', 1, 2, 'hex'), 2);

assert.strictEqual(buf[0], 0xFF);

assert.strictEqual(buf[1], 0xAB);

assert.strictEqual(buf[2], 0xCD);

assert.strictEqual(buf[3], 0xFF);

['ucs2', 'ucs-2', 'utf16le', 'utf-16le'].forEach((encoding) => {

buf.fill(0xFF);

assert.strictEqual(buf.write('abcd', 0, 2, encoding), 2);

assert.strictEqual(buf[0], 0x61);

assert.strictEqual(buf[1], 0x00);

assert.strictEqual(buf[2], 0xFF);

assert.strictEqual(buf[3], 0xFF);

});

}

{

// Test offset returns are correct

const b = Buffer.allocUnsafe(16);

assert.strictEqual(b.writeUInt32LE(0, 0), 4);

assert.strictEqual(b.writeUInt16LE(0, 4), 6);

assert.strictEqual(b.writeUInt8(0, 6), 7);

assert.strictEqual(b.writeInt8(0, 7), 8);

assert.strictEqual(b.writeDoubleLE(0, 8), 16);

}

{

// Test unmatched surrogates not producing invalid utf8 output

// ef bf bd = utf-8 representation of unicode replacement character

// see https://codereview.chromium.org/121173009/

const buf = Buffer.from('ab\ud800cd', 'utf8');

assert.strictEqual(buf[0], 0x61);

assert.strictEqual(buf[1], 0x62);

assert.strictEqual(buf[2], 0xef);

assert.strictEqual(buf[3], 0xbf);

assert.strictEqual(buf[4], 0xbd);

assert.strictEqual(buf[5], 0x63);

assert.strictEqual(buf[6], 0x64);

}

{

// Test for buffer overrun

const buf = Buffer.from([0, 0, 0, 0, 0]); // length: 5

const sub = buf.slice(0, 4); // length: 4

assert.strictEqual(sub.write('12345', 'latin1'), 4);

assert.strictEqual(buf[4], 0);

assert.strictEqual(sub.write('12345', 'binary'), 4);

assert.strictEqual(buf[4], 0);

}

{

// Test alloc with fill option

const buf = Buffer.alloc(5, '800A', 'hex');

assert.strictEqual(buf[0], 128);

assert.strictEqual(buf[1], 10);

assert.strictEqual(buf[2], 128);

assert.strictEqual(buf[3], 10);

assert.strictEqual(buf[4], 128);

}

// Check for fractional length args, junk length args, etc.

// https://github.com/joyent/node/issues/1758

// Call .fill() first, stops valgrind warning about uninitialized memory reads.

Buffer.allocUnsafe(3.3).fill().toString();

// Throws bad argument error in commit 43cb4ec

Buffer.alloc(3.3).fill().toString();

assert.strictEqual(Buffer.allocUnsafe(3.3).length, 3);

assert.strictEqual(Buffer.from({ length: 3.3 }).length, 3);

assert.strictEqual(Buffer.from({ length: 'BAM' }).length, 0);

// Make sure that strings are not coerced to numbers.

assert.strictEqual(Buffer.from('99').length, 2);

assert.strictEqual(Buffer.from('13.37').length, 5);

// Ensure that the length argument is respected.

['ascii', 'utf8', 'hex', 'base64', 'latin1', 'binary'].forEach((enc) => {

assert.strictEqual(Buffer.allocUnsafe(1).write('aaaaaa', 0, 1, enc), 1);

});

{

// Regression test, guard against buffer overrun in the base64 decoder.

const a = Buffer.allocUnsafe(3);

const b = Buffer.from('xxx');

a.write('aaaaaaaa', 'base64');

assert.strictEqual(b.toString(), 'xxx');

}

// issue GH-3416

Buffer.from(Buffer.allocUnsafe(0), 0, 0);

// issue GH-5587

assert.throws(

() => Buffer.alloc(8).writeFloatLE(0, 5),

outOfRangeError

);

assert.throws(

() => Buffer.alloc(16).writeDoubleLE(0, 9),

outOfRangeError

);

// Attempt to overflow buffers, similar to previous bug in array buffers

assert.throws(

() => Buffer.allocUnsafe(8).writeFloatLE(0.0, 0xffffffff),

outOfRangeError

);

assert.throws(

() => Buffer.allocUnsafe(8).writeFloatLE(0.0, 0xffffffff),

outOfRangeError

);

// Ensure negative values can't get past offset

assert.throws(

() => Buffer.allocUnsafe(8).writeFloatLE(0.0, -1),

outOfRangeError

);

assert.throws(

() => Buffer.allocUnsafe(8).writeFloatLE(0.0, -1),

outOfRangeError

);

// Test for common write(U)IntLE/BE

{

let buf = Buffer.allocUnsafe(3);

buf.writeUIntLE(0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x56, 0x34, 0x12]);

assert.strictEqual(buf.readUIntLE(0, 3), 0x123456);

buf.fill(0xFF);

buf.writeUIntBE(0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x12, 0x34, 0x56]);

assert.strictEqual(buf.readUIntBE(0, 3), 0x123456);

buf.fill(0xFF);

buf.writeIntLE(0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x56, 0x34, 0x12]);

assert.strictEqual(buf.readIntLE(0, 3), 0x123456);

buf.fill(0xFF);

buf.writeIntBE(0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x12, 0x34, 0x56]);

assert.strictEqual(buf.readIntBE(0, 3), 0x123456);

buf.fill(0xFF);

buf.writeIntLE(-0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0xaa, 0xcb, 0xed]);

assert.strictEqual(buf.readIntLE(0, 3), -0x123456);

buf.fill(0xFF);

buf.writeIntBE(-0x123456, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0xed, 0xcb, 0xaa]);

assert.strictEqual(buf.readIntBE(0, 3), -0x123456);

buf.fill(0xFF);

buf.writeIntLE(-0x123400, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x00, 0xcc, 0xed]);

assert.strictEqual(buf.readIntLE(0, 3), -0x123400);

buf.fill(0xFF);

buf.writeIntBE(-0x123400, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0xed, 0xcc, 0x00]);

assert.strictEqual(buf.readIntBE(0, 3), -0x123400);

buf.fill(0xFF);

buf.writeIntLE(-0x120000, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0x00, 0x00, 0xee]);

assert.strictEqual(buf.readIntLE(0, 3), -0x120000);

buf.fill(0xFF);

buf.writeIntBE(-0x120000, 0, 3);

assert.deepStrictEqual(buf.toJSON().data, [0xee, 0x00, 0x00]);

assert.strictEqual(buf.readIntBE(0, 3), -0x120000);

buf = Buffer.allocUnsafe(5);

buf.writeUIntLE(0x1234567890, 0, 5);

assert.deepStrictEqual(buf.toJSON().data, [0x90, 0x78, 0x56, 0x34, 0x12]);

assert.strictEqual(buf.readUIntLE(0, 5), 0x1234567890);

buf.fill(0xFF);

buf.writeUIntBE(0x1234567890, 0, 5);

assert.deepStrictEqual(buf.toJSON().data, [0x12, 0x34, 0x56, 0x78, 0x90]);

assert.strictEqual(buf.readUIntBE(0, 5), 0x1234567890);

buf.fill(0xFF);

buf.writeIntLE(0x1234567890, 0, 5);

assert.deepStrictEqual(buf.toJSON().data, [0x90, 0x78, 0x56, 0x34, 0x12]);

assert.strictEqual(buf.readIntLE(0, 5), 0x1234567890);

buf.fill(0xFF);

buf.writeIntBE(0x1234567890, 0, 5);

assert.deepStrictEqual(buf.toJSON().data, [0x12, 0x34, 0x56, 0x78, 0x90]);

assert.strictEqual(buf.readIntBE(0, 5), 0x1234567890);

buf.fill(0xFF);

buf.writeIntLE(-0x1234567890, 0, 5);

assert.deepStrictEqual(buf.toJSON().data, [0x70, 0x87, 0xa9, 0xcb, 0xed]);

assert.strictEqual(buf.readIntLE(0, 5), -0x1234567890);

buf.fill(0xFF);

buf.writeIntBE(-0x1234567890, 0, 5);