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"use strict"; var Buffer = require("safer-buffer").Buffer; // UTF-7 codec, according to https://tools.ietf.org/html/rfc2152 // See also below a UTF-7-IMAP codec, according to http://tools.ietf.org/html/rfc3501#section-5.1.3 exports.utf7 = Utf7Codec; exports.unicode11utf7 = 'utf7'; // Alias UNICODE-1-1-UTF-7 function Utf7Codec(codecOptions, iconv) { this.iconv = iconv; }; Utf7Codec.prototype.encoder = Utf7Encoder; Utf7Codec.prototype.decoder = Utf7Decoder; Utf7Codec.prototype.bomAware = true; // -- Encoding var nonDirectChars = /[^A-Za-z0-9',-\.\/:\? \n\r\t]+/g; function Utf7Encoder(options, codec) { this.iconv = codec.iconv; } Utf7Encoder.prototype.write = function(str) { // Naive implementation. // Non-direct chars are encoded as "+<base64>-"; single "+" char is encoded as "+-". return Buffer.from(str.replace(nonDirectChars, function(chunk) { return "+" + (chunk === '+' ? '' : this.iconv.encode(chunk, 'utf16-be').toString('base64').replace(/=+$/, '')) + "-"; }.bind(this))); } Utf7Encoder.prototype.end = function() { } // -- Decoding function Utf7Decoder(options, codec) { this.iconv = codec.iconv; this.inBase64 = false; this.base64Accum = ''; } var base64Regex = /[A-Za-z0-9\/+]/; var base64Chars = []; for (var i = 0; i < 256; i++) base64Chars[i] = base64Regex.test(String.fromCharCode(i)); var plusChar = '+'.charCodeAt(0), minusChar = '-'.charCodeAt(0), andChar = '&'.charCodeAt(0); Utf7Decoder.prototype.write = function(buf) { var res = "", lastI = 0, inBase64 = this.inBase64, base64Accum = this.base64Accum; // The decoder is more involved as we must handle chunks in stream. for (var i = 0; i < buf.length; i++) { if (!inBase64) { // We're in direct mode. // Write direct chars until '+' if (buf[i] == plusChar) { res += this.iconv.decode(buf.slice(lastI, i), "ascii"); // Write direct chars. lastI = i+1; inBase64 = true; } } else { // We decode base64. if (!base64Chars[buf[i]]) { // Base64 ended. if (i == lastI && buf[i] == minusChar) {// "+-" -> "+" res += "+"; } else { var b64str = base64Accum + buf.slice(lastI, i).toString(); res += this.iconv.decode(Buffer.from(b64str, 'base64'), "utf16-be"); } if (buf[i] != minusChar) // Minus is absorbed after base64. i--; lastI = i+1; inBase64 = false; base64Accum = ''; } } } if (!inBase64) { res += this.iconv.decode(buf.slice(lastI), "ascii"); // Write direct chars. } else { var b64str = base64Accum + buf.slice(lastI).toString(); var canBeDecoded = b64str.length - (b64str.length % 8); // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars. base64Accum = b64str.slice(canBeDecoded); // The rest will be decoded in future. b64str = b64str.slice(0, canBeDecoded); res += this.iconv.decode(Buffer.from(b64str, 'base64'), "utf16-be"); } this.inBase64 = inBase64; this.base64Accum = base64Accum; return res; } Utf7Decoder.prototype.end = function() { var res = ""; if (this.inBase64 && this.base64Accum.length > 0) res = this.iconv.decode(Buffer.from(this.base64Accum, 'base64'), "utf16-be"); this.inBase64 = false; this.base64Accum = ''; return res; } // UTF-7-IMAP codec. // RFC3501 Sec. 5.1.3 Modified UTF-7 (http://tools.ietf.org/html/rfc3501#section-5.1.3) // Differences: // * Base64 part is started by "&" instead of "+" // * Direct characters are 0x20-0x7E, except "&" (0x26) // * In Base64, "," is used instead of "/" // * Base64 must not be used to represent direct characters. // * No implicit shift back from Base64 (should always end with '-') // * String must end in non-shifted position. // * "-&" while in base64 is not allowed. exports.utf7imap = Utf7IMAPCodec; function Utf7IMAPCodec(codecOptions, iconv) { this.iconv = iconv; }; Utf7IMAPCodec.prototype.encoder = Utf7IMAPEncoder; Utf7IMAPCodec.prototype.decoder = Utf7IMAPDecoder; Utf7IMAPCodec.prototype.bomAware = true; // -- Encoding function Utf7IMAPEncoder(options, codec) { this.iconv = codec.iconv; this.inBase64 = false; this.base64Accum = Buffer.alloc(6); this.base64AccumIdx = 0; } Utf7IMAPEncoder.prototype.write = function(str) { var inBase64 = this.inBase64, base64Accum = this.base64Accum, base64AccumIdx = this.base64AccumIdx, buf = Buffer.alloc(str.length*5 + 10), bufIdx = 0; for (var i = 0; i < str.length; i++) { var uChar = str.charCodeAt(i); if (0x20 <= uChar && uChar <= 0x7E) { // Direct character or '&'. if (inBase64) { if (base64AccumIdx > 0) { bufIdx += buf.write(base64Accum.slice(0, base64AccumIdx).toString('base64').replace(/\//g, ',').replace(/=+$/, ''), bufIdx); base64AccumIdx = 0; } buf[bufIdx++] = minusChar; // Write '-', then go to direct mode. inBase64 = false; } if (!inBase64) { buf[bufIdx++] = uChar; // Write direct character if (uChar === andChar) // Ampersand -> '&-' buf[bufIdx++] = minusChar; } } else { // Non-direct character if (!inBase64) { buf[bufIdx++] = andChar; // Write '&', then go to base64 mode. inBase64 = true; } if (inBase64) { base64Accum[base64AccumIdx++] = uChar >> 8; base64Accum[base64AccumIdx++] = uChar & 0xFF; if (base64AccumIdx == base64Accum.length) { bufIdx += buf.write(base64Accum.toString('base64').replace(/\//g, ','), bufIdx); base64AccumIdx = 0; } } } } this.inBase64 = inBase64; this.base64AccumIdx = base64AccumIdx; return buf.slice(0, bufIdx); } Utf7IMAPEncoder.prototype.end = function() { var buf = Buffer.alloc(10), bufIdx = 0; if (this.inBase64) { if (this.base64AccumIdx > 0) { bufIdx += buf.write(this.base64Accum.slice(0, this.base64AccumIdx).toString('base64').replace(/\//g, ',').replace(/=+$/, ''), bufIdx); this.base64AccumIdx = 0; } buf[bufIdx++] = minusChar; // Write '-', then go to direct mode. this.inBase64 = false; } return buf.slice(0, bufIdx); } // -- Decoding function Utf7IMAPDecoder(options, codec) { this.iconv = codec.iconv; this.inBase64 = false; this.base64Accum = ''; } var base64IMAPChars = base64Chars.slice(); base64IMAPChars[','.charCodeAt(0)] = true; Utf7IMAPDecoder.prototype.write = function(buf) { var res = "", lastI = 0, inBase64 = this.inBase64, base64Accum = this.base64Accum; // The decoder is more involved as we must handle chunks in stream. // It is forgiving, closer to standard UTF-7 (for example, '-' is optional at the end). for (var i = 0; i < buf.length; i++) { if (!inBase64) { // We're in direct mode. // Write direct chars until '&' if (buf[i] == andChar) { res += this.iconv.decode(buf.slice(lastI, i), "ascii"); // Write direct chars. lastI = i+1; inBase64 = true; } } else { // We decode base64. if (!base64IMAPChars[buf[i]]) { // Base64 ended. if (i == lastI && buf[i] == minusChar) { // "&-" -> "&" res += "&"; } else { var b64str = base64Accum + buf.slice(lastI, i).toString().replace(/,/g, '/'); res += this.iconv.decode(Buffer.from(b64str, 'base64'), "utf16-be"); } if (buf[i] != minusChar) // Minus may be absorbed after base64. i--; lastI = i+1; inBase64 = false; base64Accum = ''; } } } if (!inBase64) { res += this.iconv.decode(buf.slice(lastI), "ascii"); // Write direct chars. } else { var b64str = base64Accum + buf.slice(lastI).toString().replace(/,/g, '/'); var canBeDecoded = b64str.length - (b64str.length % 8); // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars. base64Accum = b64str.slice(canBeDecoded); // The rest will be decoded in future. b64str = b64str.slice(0, canBeDecoded); res += this.iconv.decode(Buffer.from(b64str, 'base64'), "utf16-be"); } this.inBase64 = inBase64; this.base64Accum = base64Accum; return res; } Utf7IMAPDecoder.prototype.end = function() { var res = ""; if (this.inBase64 && this.base64Accum.length > 0) res = this.iconv.decode(Buffer.from(this.base64Accum, 'base64'), "utf16-be"); this.inBase64 = false; this.base64Accum = ''; return res; }

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