// Copyright Joyent, Inc. and other Node contributors. // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to permit // persons to whom the Software is furnished to do so, subject to the // following conditions: // // The above copyright notice and this permission notice shall be included // in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE // USE OR OTHER DEALINGS IN THE SOFTWARE. var common = require('../common'); var assert = require('assert'); var Buffer = require('buffer').Buffer; var b = Buffer(1024); // safe constructor console.log('b.length == ' + b.length); assert.strictEqual(1024, b.length); b[0] = -1; assert.equal(b[0], 255); for (var i = 0; i < 1024; i++) { b[i] = i % 256; } for (var i = 0; i < 1024; i++) { assert.equal(i % 256, b[i]); } var c = new Buffer(512); console.log('c.length == %d', c.length); assert.strictEqual(512, c.length); // copy 512 bytes, from 0 to 512. var copied = b.copy(c, 0, 0, 512); console.log('copied ' + copied + ' bytes from b into c'); assert.equal(512, copied); for (var i = 0; i < c.length; i++) { common.print('.'); assert.equal(i % 256, c[i]); } console.log(''); // try to copy 513 bytes, and hope we don't overrun c, which is only 512 long var copied = b.copy(c, 0, 0, 513); console.log('copied ' + copied + ' bytes from b into c'); assert.strictEqual(512, copied); for (var i = 0; i < c.length; i++) { assert.equal(i % 256, c[i]); } // copy all of c back into b, without specifying sourceEnd var copied = c.copy(b, 0, 0); console.log('copied ' + copied + ' bytes from c back into b'); assert.strictEqual(512, copied); for (var i = 0; i < b.length; i++) { assert.equal(i % 256, b[i]); } // copy 768 bytes from b into b var copied = b.copy(b, 0, 256, 1024); console.log('copied ' + copied + ' bytes from b into c'); assert.strictEqual(768, copied); for (var i = 0; i < c.length; i++) { assert.equal(i % 256, c[i]); } var caught_error = null; // try to copy from before the beginning of b caught_error = null; try { var copied = b.copy(c, 0, 100, 10); } catch (err) { caught_error = err; } assert.strictEqual('sourceEnd < sourceStart', caught_error.message); // try to copy to before the beginning of c caught_error = null; try { var copied = b.copy(c, -1, 0, 10); } catch (err) { caught_error = err; } assert.strictEqual('targetStart out of bounds', caught_error.message); // try to copy to after the end of c caught_error = null; try { var copied = b.copy(c, 512, 0, 10); } catch (err) { caught_error = err; } assert.strictEqual('targetStart out of bounds', caught_error.message); // try to copy starting before the beginning of b caught_error = null; try { var copied = b.copy(c, 0, -1, 1); } catch (err) { caught_error = err; } assert.strictEqual('sourceStart out of bounds', caught_error.message); // try to copy starting after the end of b caught_error = null; try { var copied = b.copy(c, 0, 1024, 1025); } catch (err) { caught_error = err; } assert.strictEqual('sourceStart out of bounds', caught_error.message); // a too-low sourceEnd will get caught by earlier checks // try to copy ending after the end of b try { var copied = b.copy(c, 0, 1023, 1025); } catch (err) { caught_error = err; } assert.strictEqual('sourceEnd out of bounds', caught_error.message); // try to create 0-length buffers new Buffer(''); new Buffer('', 'ascii'); new Buffer('', 'binary'); new Buffer(0); // try to write a 0-length string beyond the end of b b.write('', 1024); b.write('', 2048); // try to copy 0 bytes worth of data into an empty buffer b.copy(new Buffer(0), 0, 0, 0); // try to copy 0 bytes past the end of the target buffer b.copy(new Buffer(0), 1, 1, 1); b.copy(new Buffer(1), 1, 1, 1); // try to copy 0 bytes from past the end of the source buffer b.copy(new Buffer(1), 0, 2048, 2048); // try to toString() a 0-length slice of a buffer, both within and without the // valid buffer range assert.equal(new Buffer('abc').toString('ascii', 0, 0), ''); assert.equal(new Buffer('abc').toString('ascii', -100, -100), ''); assert.equal(new Buffer('abc').toString('ascii', 100, 100), ''); // try toString() with a object as a encoding assert.equal(new Buffer('abc').toString({toString: function() { return 'ascii'; }}), 'abc'); // testing for smart defaults and ability to pass string values as offset var writeTest = new Buffer('abcdes'); writeTest.write('n', 'ascii'); writeTest.write('o', 'ascii', '1'); writeTest.write('d', '2', 'ascii'); writeTest.write('e', 3, 'ascii'); writeTest.write('j', 'ascii', 4); assert.equal(writeTest.toString(), 'nodejs'); var asciiString = 'hello world'; var offset = 100; for (var j = 0; j < 500; j++) { for (var i = 0; i < asciiString.length; i++) { b[i] = asciiString.charCodeAt(i); } var asciiSlice = b.toString('ascii', 0, asciiString.length); assert.equal(asciiString, asciiSlice); var written = b.write(asciiString, offset, 'ascii'); assert.equal(asciiString.length, written); var asciiSlice = b.toString('ascii', offset, offset + asciiString.length); assert.equal(asciiString, asciiSlice); var sliceA = b.slice(offset, offset + asciiString.length); var sliceB = b.slice(offset, offset + asciiString.length); for (var i = 0; i < asciiString.length; i++) { assert.equal(sliceA[i], sliceB[i]); } // TODO utf8 slice tests } for (var j = 0; j < 100; j++) { var slice = b.slice(100, 150); assert.equal(50, slice.length); for (var i = 0; i < 50; i++) { assert.equal(b[100 + i], slice[i]); } } // Bug regression test var testValue = '\u00F6\u65E5\u672C\u8A9E'; // ö日本語 var buffer = new Buffer(32); var size = buffer.write(testValue, 0, 'utf8'); console.log('bytes written to buffer: ' + size); var slice = buffer.toString('utf8', 0, size); assert.equal(slice, testValue); // Test triple slice var a = new Buffer(8); for (var i = 0; i < 8; i++) a[i] = i; var b = a.slice(4, 8); assert.equal(4, b[0]); assert.equal(5, b[1]); assert.equal(6, b[2]); assert.equal(7, b[3]); var c = b.slice(2, 4); assert.equal(6, c[0]); assert.equal(7, c[1]); var d = new Buffer([23, 42, 255]); assert.equal(d.length, 3); assert.equal(d[0], 23); assert.equal(d[1], 42); assert.equal(d[2], 255); assert.deepEqual(d, new Buffer(d)); var e = new Buffer('über'); console.error('uber: \'%s\'', e.toString()); assert.deepEqual(e, new Buffer([195, 188, 98, 101, 114])); var f = new Buffer('über', 'ascii'); console.error('f.length: %d (should be 4)', f.length); assert.deepEqual(f, new Buffer([252, 98, 101, 114])); var f = new Buffer('über', 'ucs2'); console.error('f.length: %d (should be 8)', f.length); assert.deepEqual(f, new Buffer([252, 0, 98, 0, 101, 0, 114, 0])); var f = new Buffer('привет', 'ucs2'); console.error('f.length: %d (should be 12)', f.length); assert.deepEqual(f, new Buffer([63, 4, 64, 4, 56, 4, 50, 4, 53, 4, 66, 4])); assert.equal(f.toString('ucs2'), 'привет'); var f = new Buffer([0, 0, 0, 0, 0]); assert.equal(f.length, 5); var size = f.write('あいうえお', 'ucs2'); var charsWritten = Buffer._charsWritten; // Copy value out. console.error('bytes written to buffer: %d (should be 4)', size); console.error('chars written to buffer: %d (should be 2)', charsWritten); assert.equal(size, 4); assert.equal(charsWritten, 2); assert.deepEqual(f, new Buffer([0x42, 0x30, 0x44, 0x30, 0x00])); var arrayIsh = {0: 0, 1: 1, 2: 2, 3: 3, length: 4}; var g = new Buffer(arrayIsh); assert.deepEqual(g, new Buffer([0, 1, 2, 3])); var strArrayIsh = {0: '0', 1: '1', 2: '2', 3: '3', length: 4}; g = new Buffer(strArrayIsh); assert.deepEqual(g, new Buffer([0, 1, 2, 3])); // // Test toString('base64') // assert.equal('TWFu', (new Buffer('Man')).toString('base64')); // big example var 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.'; var expected = 'TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24s' + 'IGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltY' + 'WxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZX' + 'JzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmR' + 'lZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo' + 'ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4='; assert.equal(expected, (new Buffer(quote)).toString('base64')); b = new Buffer(1024); var bytesWritten = b.write(expected, 0, 'base64'); assert.equal(quote.length, bytesWritten); assert.equal(quote, b.toString('ascii', 0, quote.length)); // check that the base64 decoder ignores whitespace var 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 = new Buffer(1024); bytesWritten = b.write(expectedWhite, 0, 'base64'); assert.equal(quote.length, bytesWritten); assert.equal(quote, b.toString('ascii', 0, quote.length)); // check that the base64 decoder on the constructor works // even in the presence of whitespace. b = new Buffer(expectedWhite, 'base64'); assert.equal(quote.length, b.length); assert.equal(quote, b.toString('ascii', 0, quote.length)); // check that the base64 decoder ignores illegal chars var 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 = new Buffer(expectedIllegal, 'base64'); assert.equal(quote.length, b.length); assert.equal(quote, b.toString('ascii', 0, quote.length)); assert.equal(new Buffer('', 'base64').toString(), ''); assert.equal(new Buffer('K', 'base64').toString(), ''); // multiple-of-4 with padding assert.equal(new Buffer('Kg==', 'base64').toString(), '*'); assert.equal(new Buffer('Kio=', 'base64').toString(), '**'); assert.equal(new Buffer('Kioq', 'base64').toString(), '***'); assert.equal(new Buffer('KioqKg==', 'base64').toString(), '****'); assert.equal(new Buffer('KioqKio=', 'base64').toString(), '*****'); assert.equal(new Buffer('KioqKioq', 'base64').toString(), '******'); assert.equal(new Buffer('KioqKioqKg==', 'base64').toString(), '*******'); assert.equal(new Buffer('KioqKioqKio=', 'base64').toString(), '********'); assert.equal(new Buffer('KioqKioqKioq', 'base64').toString(), '*********'); assert.equal(new Buffer('KioqKioqKioqKg==', 'base64').toString(), '**********'); assert.equal(new Buffer('KioqKioqKioqKio=', 'base64').toString(), '***********'); assert.equal(new Buffer('KioqKioqKioqKioq', 'base64').toString(), '************'); assert.equal(new Buffer('KioqKioqKioqKioqKg==', 'base64').toString(), '*************'); assert.equal(new Buffer('KioqKioqKioqKioqKio=', 'base64').toString(), '**************'); assert.equal(new Buffer('KioqKioqKioqKioqKioq', 'base64').toString(), '***************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKg==', 'base64').toString(), '****************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKio=', 'base64').toString(), '*****************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKioq', 'base64').toString(), '******************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKioqKg==', 'base64').toString(), '*******************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKioqKio=', 'base64').toString(), '********************'); // no padding, not a multiple of 4 assert.equal(new Buffer('Kg', 'base64').toString(), '*'); assert.equal(new Buffer('Kio', 'base64').toString(), '**'); assert.equal(new Buffer('KioqKg', 'base64').toString(), '****'); assert.equal(new Buffer('KioqKio', 'base64').toString(), '*****'); assert.equal(new Buffer('KioqKioqKg', 'base64').toString(), '*******'); assert.equal(new Buffer('KioqKioqKio', 'base64').toString(), '********'); assert.equal(new Buffer('KioqKioqKioqKg', 'base64').toString(), '**********'); assert.equal(new Buffer('KioqKioqKioqKio', 'base64').toString(), '***********'); assert.equal(new Buffer('KioqKioqKioqKioqKg', 'base64').toString(), '*************'); assert.equal(new Buffer('KioqKioqKioqKioqKio', 'base64').toString(), '**************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKg', 'base64').toString(), '****************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKio', 'base64').toString(), '*****************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKioqKg', 'base64').toString(), '*******************'); assert.equal(new Buffer('KioqKioqKioqKioqKioqKioqKio', 'base64').toString(), '********************'); // handle padding graciously, multiple-of-4 or not assert.equal(new Buffer('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw==', 'base64').length, 32); assert.equal(new Buffer('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw=', 'base64').length, 32); assert.equal(new Buffer('72INjkR5fchcxk9+VgdGPFJDxUBFR5/rMFsghgxADiw', 'base64').length, 32); assert.equal(new Buffer('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg==', 'base64').length, 31); assert.equal(new Buffer('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg=', 'base64').length, 31); assert.equal(new Buffer('w69jACy6BgZmaFvv96HG6MYksWytuZu3T1FvGnulPg', 'base64').length, 31); // This string encodes single '.' character in UTF-16 var dot = new Buffer('//4uAA==', 'base64'); assert.equal(dot[0], 0xff); assert.equal(dot[1], 0xfe); assert.equal(dot[2], 0x2e); assert.equal(dot[3], 0x00); assert.equal(dot.toString('base64'), '//4uAA=='); // Writing base64 at a position > 0 should not mangle the result. // // https://github.com/joyent/node/issues/402 var segments = ['TWFkbmVzcz8h', 'IFRoaXM=', 'IGlz', 'IG5vZGUuanMh']; var buf = new Buffer(64); var pos = 0; for (var i = 0; i < segments.length; ++i) { pos += b.write(segments[i], pos, 'base64'); } assert.equal(b.toString('binary', 0, pos), 'Madness?! This is node.js!'); // Creating buffers larger than pool size. var l = Buffer.poolSize + 5; var s = ''; for (i = 0; i < l; i++) { s += 'h'; } var b = new Buffer(s); for (i = 0; i < l; i++) { assert.equal('h'.charCodeAt(0), b[i]); } var sb = b.toString(); assert.equal(sb.length, s.length); assert.equal(sb, s); // Single argument slice b = new Buffer('abcde'); assert.equal('bcde', b.slice(1).toString()); // byte length assert.equal(14, Buffer.byteLength('Il était tué')); assert.equal(14, Buffer.byteLength('Il était tué', 'utf8')); assert.equal(24, Buffer.byteLength('Il était tué', 'ucs2')); assert.equal(12, Buffer.byteLength('Il était tué', 'ascii')); assert.equal(12, Buffer.byteLength('Il était tué', 'binary')); // slice(0,0).length === 0 assert.equal(0, Buffer('hello').slice(0, 0).length); // test hex toString console.log('Create hex string from buffer'); var hexb = new Buffer(256); for (var i = 0; i < 256; i++) { hexb[i] = i; } var hexStr = hexb.toString('hex'); assert.equal(hexStr, '000102030405060708090a0b0c0d0e0f' + '101112131415161718191a1b1c1d1e1f' + '202122232425262728292a2b2c2d2e2f' + '303132333435363738393a3b3c3d3e3f' + '404142434445464748494a4b4c4d4e4f' + '505152535455565758595a5b5c5d5e5f' + '606162636465666768696a6b6c6d6e6f' + '707172737475767778797a7b7c7d7e7f' + '808182838485868788898a8b8c8d8e8f' + '909192939495969798999a9b9c9d9e9f' + 'a0a1a2a3a4a5a6a7a8a9aaabacadaeaf' + 'b0b1b2b3b4b5b6b7b8b9babbbcbdbebf' + 'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf' + 'd0d1d2d3d4d5d6d7d8d9dadbdcdddedf' + 'e0e1e2e3e4e5e6e7e8e9eaebecedeeef' + 'f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff'); console.log('Create buffer from hex string'); var hexb2 = new Buffer(hexStr, 'hex'); for (var i = 0; i < 256; i++) { assert.equal(hexb2[i], hexb[i]); } // test an invalid slice end. console.log('Try to slice off the end of the buffer'); var b = new Buffer([1, 2, 3, 4, 5]); var b2 = b.toString('hex', 1, 10000); var b3 = b.toString('hex', 1, 5); var b4 = b.toString('hex', 1); assert.equal(b2, b3); assert.equal(b2, b4); // Test slice on SlowBuffer GH-843 var SlowBuffer = process.binding('buffer').SlowBuffer; function buildSlowBuffer(data) { if (Array.isArray(data)) { var buffer = new SlowBuffer(data.length); data.forEach(function(v, k) { buffer[k] = v; }); return buffer; } return null; } var x = buildSlowBuffer([0x81, 0xa3, 0x66, 0x6f, 0x6f, 0xa3, 0x62, 0x61, 0x72]); console.log(x.inspect()); assert.equal('', x.inspect()); var z = x.slice(4); console.log(z.inspect()); console.log(z.length); assert.equal(5, z.length); assert.equal(0x6f, z[0]); assert.equal(0xa3, z[1]); assert.equal(0x62, z[2]); assert.equal(0x61, z[3]); assert.equal(0x72, z[4]); var z = x.slice(0); console.log(z.inspect()); console.log(z.length); assert.equal(z.length, x.length); var z = x.slice(0, 4); console.log(z.inspect()); console.log(z.length); assert.equal(4, z.length); assert.equal(0x81, z[0]); assert.equal(0xa3, z[1]); var z = x.slice(0, 9); console.log(z.inspect()); console.log(z.length); assert.equal(9, z.length); var z = x.slice(1, 4); console.log(z.inspect()); console.log(z.length); assert.equal(3, z.length); assert.equal(0xa3, z[0]); var z = x.slice(2, 4); console.log(z.inspect()); console.log(z.length); assert.equal(2, z.length); assert.equal(0x66, z[0]); assert.equal(0x6f, z[1]); assert.equal(0, Buffer('hello').slice(0, 0).length); b = new Buffer(50); b.fill('h'); for (var i = 0; i < b.length; i++) { assert.equal('h'.charCodeAt(0), b[i]); } b.fill(0); for (var i = 0; i < b.length; i++) { assert.equal(0, b[i]); } b.fill(1, 16, 32); for (var i = 0; i < 16; i++) assert.equal(0, b[i]); for (; i < 32; i++) assert.equal(1, b[i]); for (; i < b.length; i++) assert.equal(0, b[i]); var b = new SlowBuffer(10); b.write('あいうえお', 'ucs2'); assert.equal(b.toString('ucs2'), 'あいうえお'); // Binary encoding should write only one byte per character. var b = Buffer([0xde, 0xad, 0xbe, 0xef]); var s = String.fromCharCode(0xffff); b.write(s, 0, 'binary'); assert.equal(0xff, b[0]); assert.equal(0xad, b[1]); assert.equal(0xbe, b[2]); assert.equal(0xef, b[3]); s = String.fromCharCode(0xaaee); b.write(s, 0, 'binary'); assert.equal(0xee, b[0]); assert.equal(0xad, b[1]); assert.equal(0xbe, b[2]); assert.equal(0xef, b[3]); // This should not segfault the program. assert.throws(function() { new Buffer('"pong"', 0, 6, 8031, '127.0.0.1'); }); // #1210 Test UTF-8 string includes null character var buf = new Buffer('\0'); assert.equal(buf.length, 1); buf = new Buffer('\0\0'); assert.equal(buf.length, 2); buf = new Buffer(2); var written = buf.write(''); // 0byte assert.equal(written, 0); written = buf.write('\0'); // 1byte (v8 adds null terminator) assert.equal(written, 1); written = buf.write('a\0'); // 1byte * 2 assert.equal(written, 2); written = buf.write('あ'); // 3bytes assert.equal(written, 0); written = buf.write('\0あ'); // 1byte + 3bytes assert.equal(written, 1); written = buf.write('\0\0あ'); // 1byte * 2 + 3bytes assert.equal(written, 2); buf = new Buffer(10); written = buf.write('あいう'); // 3bytes * 3 (v8 adds null terminator) assert.equal(written, 9); written = buf.write('あいう\0'); // 3bytes * 3 + 1byte assert.equal(written, 10); // #243 Test write() with maxLength var buf = new Buffer(4); buf.fill(0xFF); var written = buf.write('abcd', 1, 2, 'utf8'); console.log(buf); assert.equal(written, 2); assert.equal(buf[0], 0xFF); assert.equal(buf[1], 0x61); assert.equal(buf[2], 0x62); assert.equal(buf[3], 0xFF); buf.fill(0xFF); written = buf.write('abcd', 1, 4); console.log(buf); assert.equal(written, 3); assert.equal(buf[0], 0xFF); assert.equal(buf[1], 0x61); assert.equal(buf[2], 0x62); assert.equal(buf[3], 0x63); buf.fill(0xFF); written = buf.write('abcd', 'utf8', 1, 2); // legacy style console.log(buf); assert.equal(written, 2); assert.equal(buf[0], 0xFF); assert.equal(buf[1], 0x61); assert.equal(buf[2], 0x62); assert.equal(buf[3], 0xFF); buf.fill(0xFF); written = buf.write('abcdef', 1, 2, 'hex'); console.log(buf); assert.equal(written, 2); assert.equal(buf[0], 0xFF); assert.equal(buf[1], 0xAB); assert.equal(buf[2], 0xCD); assert.equal(buf[3], 0xFF); buf.fill(0xFF); written = buf.write('abcd', 0, 2, 'ucs2'); console.log(buf); assert.equal(written, 2); assert.equal(buf[0], 0x61); assert.equal(buf[1], 0x00); assert.equal(buf[2], 0xFF); assert.equal(buf[3], 0xFF); // test for buffer overrun buf = new Buffer([0, 0, 0, 0, 0]); // length: 5 var sub = buf.slice(0, 4); // length: 4 written = sub.write('12345', 'binary'); assert.equal(written, 4); assert.equal(buf[4], 0); // test for _charsWritten buf = new Buffer(9); buf.write('あいうえ', 'utf8'); // 3bytes * 4 assert.equal(Buffer._charsWritten, 3); buf.write('あいうえお', 'ucs2'); // 2bytes * 5 assert.equal(Buffer._charsWritten, 4); buf.write('0123456789', 'ascii'); assert.equal(Buffer._charsWritten, 9); buf.write('0123456789', 'binary'); assert.equal(Buffer._charsWritten, 9); buf.write('123456', 'base64'); assert.equal(Buffer._charsWritten, 4); buf.write('00010203040506070809', 'hex'); assert.equal(Buffer._charsWritten, 18); // Check for fractional length args, junk length args, etc. // https://github.com/joyent/node/issues/1758 Buffer(3.3).toString(); // throws bad argument error in commit 43cb4ec assert.equal(Buffer(-1).length, 0); assert.equal(Buffer(NaN).length, 0); assert.equal(Buffer(3.3).length, 4); assert.equal(Buffer({length: 3.3}).length, 4); assert.equal(Buffer({length: 'BAM'}).length, 0); // Make sure that strings are not coerced to numbers. assert.equal(Buffer('99').length, 2); assert.equal(Buffer('13.37').length, 5); // Ensure that the length argument is respected. 'ascii utf8 hex base64 binary'.split(' ').forEach(function(enc) { assert.equal(Buffer(1).write('aaaaaa', 0, 1, enc), 1); }); // Regression test, guard against buffer overrun in the base64 decoder. var a = Buffer(3); var b = Buffer('xxx'); a.write('aaaaaaaa', 'base64'); assert.equal(b.toString(), 'xxx');