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283
node_modules/iconv-lite/encodings/utf7.js
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283
node_modules/iconv-lite/encodings/utf7.js
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"use strict"
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var Buffer = require("safer-buffer").Buffer
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// UTF-7 codec, according to https://tools.ietf.org/html/rfc2152
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// See also below a UTF-7-IMAP codec, according to http://tools.ietf.org/html/rfc3501#section-5.1.3
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exports.utf7 = Utf7Codec
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exports.unicode11utf7 = "utf7" // Alias UNICODE-1-1-UTF-7
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function Utf7Codec (codecOptions, iconv) {
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this.iconv = iconv
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};
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Utf7Codec.prototype.encoder = Utf7Encoder
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Utf7Codec.prototype.decoder = Utf7Decoder
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Utf7Codec.prototype.bomAware = true
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// -- Encoding
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// Why scape ()?./?
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// eslint-disable-next-line no-useless-escape
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var nonDirectChars = /[^A-Za-z0-9'\(\),-\.\/:\? \n\r\t]+/g
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function Utf7Encoder (options, codec) {
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this.iconv = codec.iconv
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}
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Utf7Encoder.prototype.write = function (str) {
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// Naive implementation.
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// Non-direct chars are encoded as "+<base64>-"; single "+" char is encoded as "+-".
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return Buffer.from(str.replace(nonDirectChars, function (chunk) {
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return "+" + (chunk === "+"
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? ""
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: this.iconv.encode(chunk, "utf16-be").toString("base64").replace(/=+$/, "")) +
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"-"
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}.bind(this)))
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}
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Utf7Encoder.prototype.end = function () {
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}
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// -- Decoding
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function Utf7Decoder (options, codec) {
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this.iconv = codec.iconv
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this.inBase64 = false
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this.base64Accum = ""
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}
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// Why scape /?
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// eslint-disable-next-line no-useless-escape
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var base64Regex = /[A-Za-z0-9\/+]/
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var base64Chars = []
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for (var i = 0; i < 256; i++) { base64Chars[i] = base64Regex.test(String.fromCharCode(i)) }
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var plusChar = "+".charCodeAt(0)
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var minusChar = "-".charCodeAt(0)
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var andChar = "&".charCodeAt(0)
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Utf7Decoder.prototype.write = function (buf) {
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var res = ""; var lastI = 0
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var inBase64 = this.inBase64
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var base64Accum = this.base64Accum
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// The decoder is more involved as we must handle chunks in stream.
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for (var i = 0; i < buf.length; i++) {
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if (!inBase64) { // We're in direct mode.
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// Write direct chars until '+'
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if (buf[i] == plusChar) {
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res += this.iconv.decode(buf.slice(lastI, i), "ascii") // Write direct chars.
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lastI = i + 1
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inBase64 = true
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}
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} else { // We decode base64.
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if (!base64Chars[buf[i]]) { // Base64 ended.
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if (i == lastI && buf[i] == minusChar) { // "+-" -> "+"
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res += "+"
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} else {
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var b64str = base64Accum + this.iconv.decode(buf.slice(lastI, i), "ascii")
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res += this.iconv.decode(Buffer.from(b64str, "base64"), "utf16-be")
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}
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if (buf[i] != minusChar) // Minus is absorbed after base64.
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{ i-- }
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lastI = i + 1
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inBase64 = false
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base64Accum = ""
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}
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}
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}
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if (!inBase64) {
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res += this.iconv.decode(buf.slice(lastI), "ascii") // Write direct chars.
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} else {
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var b64str = base64Accum + this.iconv.decode(buf.slice(lastI), "ascii")
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var canBeDecoded = b64str.length - (b64str.length % 8) // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars.
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base64Accum = b64str.slice(canBeDecoded) // The rest will be decoded in future.
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b64str = b64str.slice(0, canBeDecoded)
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res += this.iconv.decode(Buffer.from(b64str, "base64"), "utf16-be")
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}
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this.inBase64 = inBase64
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this.base64Accum = base64Accum
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return res
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}
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Utf7Decoder.prototype.end = function () {
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var res = ""
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if (this.inBase64 && this.base64Accum.length > 0) { res = this.iconv.decode(Buffer.from(this.base64Accum, "base64"), "utf16-be") }
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this.inBase64 = false
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this.base64Accum = ""
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return res
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}
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// UTF-7-IMAP codec.
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// RFC3501 Sec. 5.1.3 Modified UTF-7 (http://tools.ietf.org/html/rfc3501#section-5.1.3)
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// Differences:
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// * Base64 part is started by "&" instead of "+"
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// * Direct characters are 0x20-0x7E, except "&" (0x26)
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// * In Base64, "," is used instead of "/"
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// * Base64 must not be used to represent direct characters.
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// * No implicit shift back from Base64 (should always end with '-')
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// * String must end in non-shifted position.
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// * "-&" while in base64 is not allowed.
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exports.utf7imap = Utf7IMAPCodec
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function Utf7IMAPCodec (codecOptions, iconv) {
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this.iconv = iconv
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};
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Utf7IMAPCodec.prototype.encoder = Utf7IMAPEncoder
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Utf7IMAPCodec.prototype.decoder = Utf7IMAPDecoder
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Utf7IMAPCodec.prototype.bomAware = true
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// -- Encoding
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function Utf7IMAPEncoder (options, codec) {
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this.iconv = codec.iconv
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this.inBase64 = false
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this.base64Accum = Buffer.alloc(6)
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this.base64AccumIdx = 0
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}
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Utf7IMAPEncoder.prototype.write = function (str) {
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var inBase64 = this.inBase64
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var base64Accum = this.base64Accum
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var base64AccumIdx = this.base64AccumIdx
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var buf = Buffer.alloc(str.length * 5 + 10); var bufIdx = 0
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for (var i = 0; i < str.length; i++) {
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var uChar = str.charCodeAt(i)
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if (uChar >= 0x20 && uChar <= 0x7E) { // Direct character or '&'.
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if (inBase64) {
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if (base64AccumIdx > 0) {
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bufIdx += buf.write(base64Accum.slice(0, base64AccumIdx).toString("base64").replace(/\//g, ",").replace(/=+$/, ""), bufIdx)
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base64AccumIdx = 0
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}
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buf[bufIdx++] = minusChar // Write '-', then go to direct mode.
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inBase64 = false
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}
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if (!inBase64) {
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buf[bufIdx++] = uChar // Write direct character
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if (uChar === andChar) // Ampersand -> '&-'
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{ buf[bufIdx++] = minusChar }
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}
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} else { // Non-direct character
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if (!inBase64) {
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buf[bufIdx++] = andChar // Write '&', then go to base64 mode.
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inBase64 = true
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}
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if (inBase64) {
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base64Accum[base64AccumIdx++] = uChar >> 8
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base64Accum[base64AccumIdx++] = uChar & 0xFF
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if (base64AccumIdx == base64Accum.length) {
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bufIdx += buf.write(base64Accum.toString("base64").replace(/\//g, ","), bufIdx)
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base64AccumIdx = 0
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}
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}
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}
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}
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this.inBase64 = inBase64
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this.base64AccumIdx = base64AccumIdx
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return buf.slice(0, bufIdx)
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}
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Utf7IMAPEncoder.prototype.end = function () {
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var buf = Buffer.alloc(10); var bufIdx = 0
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if (this.inBase64) {
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if (this.base64AccumIdx > 0) {
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bufIdx += buf.write(this.base64Accum.slice(0, this.base64AccumIdx).toString("base64").replace(/\//g, ",").replace(/=+$/, ""), bufIdx)
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this.base64AccumIdx = 0
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}
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buf[bufIdx++] = minusChar // Write '-', then go to direct mode.
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this.inBase64 = false
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}
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return buf.slice(0, bufIdx)
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}
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// -- Decoding
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function Utf7IMAPDecoder (options, codec) {
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this.iconv = codec.iconv
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this.inBase64 = false
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this.base64Accum = ""
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}
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var base64IMAPChars = base64Chars.slice()
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base64IMAPChars[",".charCodeAt(0)] = true
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Utf7IMAPDecoder.prototype.write = function (buf) {
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var res = ""; var lastI = 0
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var inBase64 = this.inBase64
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var base64Accum = this.base64Accum
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// The decoder is more involved as we must handle chunks in stream.
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// It is forgiving, closer to standard UTF-7 (for example, '-' is optional at the end).
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for (var i = 0; i < buf.length; i++) {
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if (!inBase64) { // We're in direct mode.
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// Write direct chars until '&'
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if (buf[i] == andChar) {
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res += this.iconv.decode(buf.slice(lastI, i), "ascii") // Write direct chars.
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lastI = i + 1
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inBase64 = true
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}
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} else { // We decode base64.
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if (!base64IMAPChars[buf[i]]) { // Base64 ended.
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if (i == lastI && buf[i] == minusChar) { // "&-" -> "&"
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res += "&"
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} else {
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var b64str = base64Accum + this.iconv.decode(buf.slice(lastI, i), "ascii").replace(/,/g, "/")
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res += this.iconv.decode(Buffer.from(b64str, "base64"), "utf16-be")
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}
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if (buf[i] != minusChar) // Minus may be absorbed after base64.
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{ i-- }
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lastI = i + 1
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inBase64 = false
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base64Accum = ""
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}
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}
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}
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if (!inBase64) {
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res += this.iconv.decode(buf.slice(lastI), "ascii") // Write direct chars.
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} else {
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var b64str = base64Accum + this.iconv.decode(buf.slice(lastI), "ascii").replace(/,/g, "/")
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var canBeDecoded = b64str.length - (b64str.length % 8) // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars.
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base64Accum = b64str.slice(canBeDecoded) // The rest will be decoded in future.
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b64str = b64str.slice(0, canBeDecoded)
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res += this.iconv.decode(Buffer.from(b64str, "base64"), "utf16-be")
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}
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this.inBase64 = inBase64
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this.base64Accum = base64Accum
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return res
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}
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Utf7IMAPDecoder.prototype.end = function () {
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var res = ""
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if (this.inBase64 && this.base64Accum.length > 0) { res = this.iconv.decode(Buffer.from(this.base64Accum, "base64"), "utf16-be") }
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this.inBase64 = false
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this.base64Accum = ""
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return res
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}
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