| 'use strict'; |
| |
| /** |
| * Checks if a status code is allowed in a close frame. |
| * |
| * @param {Number} code The status code |
| * @return {Boolean} `true` if the status code is valid, else `false` |
| * @public |
| */ |
| function isValidStatusCode(code) { |
| return ( |
| (code >= 1000 && |
| code <= 1014 && |
| code !== 1004 && |
| code !== 1005 && |
| code !== 1006) || |
| (code >= 3000 && code <= 4999) |
| ); |
| } |
| |
| /** |
| * Checks if a given buffer contains only correct UTF-8. |
| * Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by |
| * Markus Kuhn. |
| * |
| * @param {Buffer} buf The buffer to check |
| * @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false` |
| * @public |
| */ |
| function _isValidUTF8(buf) { |
| const len = buf.length; |
| let i = 0; |
| |
| while (i < len) { |
| if ((buf[i] & 0x80) === 0) { |
| // 0xxxxxxx |
| i++; |
| } else if ((buf[i] & 0xe0) === 0xc0) { |
| // 110xxxxx 10xxxxxx |
| if ( |
| i + 1 === len || |
| (buf[i + 1] & 0xc0) !== 0x80 || |
| (buf[i] & 0xfe) === 0xc0 // Overlong |
| ) { |
| return false; |
| } |
| |
| i += 2; |
| } else if ((buf[i] & 0xf0) === 0xe0) { |
| // 1110xxxx 10xxxxxx 10xxxxxx |
| if ( |
| i + 2 >= len || |
| (buf[i + 1] & 0xc0) !== 0x80 || |
| (buf[i + 2] & 0xc0) !== 0x80 || |
| (buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong |
| (buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF) |
| ) { |
| return false; |
| } |
| |
| i += 3; |
| } else if ((buf[i] & 0xf8) === 0xf0) { |
| // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx |
| if ( |
| i + 3 >= len || |
| (buf[i + 1] & 0xc0) !== 0x80 || |
| (buf[i + 2] & 0xc0) !== 0x80 || |
| (buf[i + 3] & 0xc0) !== 0x80 || |
| (buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong |
| (buf[i] === 0xf4 && buf[i + 1] > 0x8f) || |
| buf[i] > 0xf4 // > U+10FFFF |
| ) { |
| return false; |
| } |
| |
| i += 4; |
| } else { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| try { |
| let isValidUTF8 = require('utf-8-validate'); |
| |
| /* istanbul ignore if */ |
| if (typeof isValidUTF8 === 'object') { |
| isValidUTF8 = isValidUTF8.Validation.isValidUTF8; // utf-8-validate@<3.0.0 |
| } |
| |
| module.exports = { |
| isValidStatusCode, |
| isValidUTF8(buf) { |
| return buf.length < 150 ? _isValidUTF8(buf) : isValidUTF8(buf); |
| } |
| }; |
| } catch (e) /* istanbul ignore next */ { |
| module.exports = { |
| isValidStatusCode, |
| isValidUTF8: _isValidUTF8 |
| }; |
| } |