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utf32.js8.9 KB · 308 lines
"use strict" var Buffer = require("safer-buffer").Buffer // == UTF32-LE/BE codec. ========================================================== exports._utf32 = Utf32Codec function Utf32Codec (codecOptions, iconv) {  this.iconv = iconv  this.bomAware = true  this.isLE = codecOptions.isLE} exports.utf32le = { type: "_utf32", isLE: true }exports.utf32be = { type: "_utf32", isLE: false } // Aliasesexports.ucs4le = "utf32le"exports.ucs4be = "utf32be" Utf32Codec.prototype.encoder = Utf32EncoderUtf32Codec.prototype.decoder = Utf32Decoder // -- Encoding function Utf32Encoder (options, codec) {  this.isLE = codec.isLE  this.highSurrogate = 0} Utf32Encoder.prototype.write = function (str) {  var src = Buffer.from(str, "ucs2")  var dst = Buffer.alloc(src.length * 2)  var write32 = this.isLE ? dst.writeUInt32LE : dst.writeUInt32BE  var offset = 0   for (var i = 0; i < src.length; i += 2) {    var code = src.readUInt16LE(i)    var isHighSurrogate = (code >= 0xD800 && code < 0xDC00)    var isLowSurrogate = (code >= 0xDC00 && code < 0xE000)     if (this.highSurrogate) {      if (isHighSurrogate || !isLowSurrogate) {        // There shouldn't be two high surrogates in a row, nor a high surrogate which isn't followed by a low        // surrogate. If this happens, keep the pending high surrogate as a stand-alone semi-invalid character        // (technically wrong, but expected by some applications, like Windows file names).        write32.call(dst, this.highSurrogate, offset)        offset += 4      } else {        // Create 32-bit value from high and low surrogates;        var codepoint = (((this.highSurrogate - 0xD800) << 10) | (code - 0xDC00)) + 0x10000         write32.call(dst, codepoint, offset)        offset += 4        this.highSurrogate = 0         continue      }    }     if (isHighSurrogate) { this.highSurrogate = code } else {      // Even if the current character is a low surrogate, with no previous high surrogate, we'll      // encode it as a semi-invalid stand-alone character for the same reasons expressed above for      // unpaired high surrogates.      write32.call(dst, code, offset)      offset += 4      this.highSurrogate = 0    }  }   if (offset < dst.length) { dst = dst.slice(0, offset) }   return dst} Utf32Encoder.prototype.end = function () {  // Treat any leftover high surrogate as a semi-valid independent character.  if (!this.highSurrogate) { return }   var buf = Buffer.alloc(4)   if (this.isLE) { buf.writeUInt32LE(this.highSurrogate, 0) } else { buf.writeUInt32BE(this.highSurrogate, 0) }   this.highSurrogate = 0   return buf} // -- Decoding function Utf32Decoder (options, codec) {  this.isLE = codec.isLE  this.badChar = codec.iconv.defaultCharUnicode.charCodeAt(0)  this.overflow = []} Utf32Decoder.prototype.write = function (src) {  if (src.length === 0) { return "" }   var i = 0  var codepoint = 0  var dst = Buffer.alloc(src.length + 4)  var offset = 0  var isLE = this.isLE  var overflow = this.overflow  var badChar = this.badChar   if (overflow.length > 0) {    for (; i < src.length && overflow.length < 4; i++) { overflow.push(src[i]) }     if (overflow.length === 4) {      // NOTE: codepoint is a signed int32 and can be negative.      // NOTE: We copied this block from below to help V8 optimize it (it works with array, not buffer).      if (isLE) {        codepoint = overflow[i] | (overflow[i + 1] << 8) | (overflow[i + 2] << 16) | (overflow[i + 3] << 24)      } else {        codepoint = overflow[i + 3] | (overflow[i + 2] << 8) | (overflow[i + 1] << 16) | (overflow[i] << 24)      }      overflow.length = 0       offset = _writeCodepoint(dst, offset, codepoint, badChar)    }  }   // Main loop. Should be as optimized as possible.  for (; i < src.length - 3; i += 4) {    // NOTE: codepoint is a signed int32 and can be negative.    if (isLE) {      codepoint = src[i] | (src[i + 1] << 8) | (src[i + 2] << 16) | (src[i + 3] << 24)    } else {      codepoint = src[i + 3] | (src[i + 2] << 8) | (src[i + 1] << 16) | (src[i] << 24)    }    offset = _writeCodepoint(dst, offset, codepoint, badChar)  }   // Keep overflowing bytes.  for (; i < src.length; i++) {    overflow.push(src[i])  }   return dst.slice(0, offset).toString("ucs2")} function _writeCodepoint (dst, offset, codepoint, badChar) {  // NOTE: codepoint is signed int32 and can be negative. We keep it that way to help V8 with optimizations.  if (codepoint < 0 || codepoint > 0x10FFFF) {    // Not a valid Unicode codepoint    codepoint = badChar  }   // Ephemeral Planes: Write high surrogate.  if (codepoint >= 0x10000) {    codepoint -= 0x10000     var high = 0xD800 | (codepoint >> 10)    dst[offset++] = high & 0xff    dst[offset++] = high >> 8     // Low surrogate is written below.    var codepoint = 0xDC00 | (codepoint & 0x3FF)  }   // Write BMP char or low surrogate.  dst[offset++] = codepoint & 0xff  dst[offset++] = codepoint >> 8   return offset}; Utf32Decoder.prototype.end = function () {  this.overflow.length = 0} // == UTF-32 Auto codec =============================================================// Decoder chooses automatically from UTF-32LE and UTF-32BE using BOM and space-based heuristic.// Defaults to UTF-32LE. http://en.wikipedia.org/wiki/UTF-32// Encoder/decoder default can be changed: iconv.decode(buf, 'utf32', {defaultEncoding: 'utf-32be'}); // Encoder prepends BOM (which can be overridden with (addBOM: false}). exports.utf32 = Utf32AutoCodecexports.ucs4 = "utf32" function Utf32AutoCodec (options, iconv) {  this.iconv = iconv} Utf32AutoCodec.prototype.encoder = Utf32AutoEncoderUtf32AutoCodec.prototype.decoder = Utf32AutoDecoder // -- Encoding function Utf32AutoEncoder (options, codec) {  options = options || {}   if (options.addBOM === undefined) {    options.addBOM = true  }   this.encoder = codec.iconv.getEncoder(options.defaultEncoding || "utf-32le", options)} Utf32AutoEncoder.prototype.write = function (str) {  return this.encoder.write(str)} Utf32AutoEncoder.prototype.end = function () {  return this.encoder.end()} // -- Decoding function Utf32AutoDecoder (options, codec) {  this.decoder = null  this.initialBufs = []  this.initialBufsLen = 0  this.options = options || {}  this.iconv = codec.iconv} Utf32AutoDecoder.prototype.write = function (buf) {  if (!this.decoder) {    // Codec is not chosen yet. Accumulate initial bytes.    this.initialBufs.push(buf)    this.initialBufsLen += buf.length     if (this.initialBufsLen < 32) // We need more bytes to use space heuristic (see below)    { return "" }     // We have enough bytes -> detect endianness.    var encoding = detectEncoding(this.initialBufs, this.options.defaultEncoding)    this.decoder = this.iconv.getDecoder(encoding, this.options)     var resStr = ""    for (var i = 0; i < this.initialBufs.length; i++) { resStr += this.decoder.write(this.initialBufs[i]) }     this.initialBufs.length = this.initialBufsLen = 0    return resStr  }   return this.decoder.write(buf)} Utf32AutoDecoder.prototype.end = function () {  if (!this.decoder) {    var encoding = detectEncoding(this.initialBufs, this.options.defaultEncoding)    this.decoder = this.iconv.getDecoder(encoding, this.options)     var resStr = ""    for (var i = 0; i < this.initialBufs.length; i++) { resStr += this.decoder.write(this.initialBufs[i]) }     var trail = this.decoder.end()    if (trail) { resStr += trail }     this.initialBufs.length = this.initialBufsLen = 0    return resStr  }   return this.decoder.end()} function detectEncoding (bufs, defaultEncoding) {  var b = []  var charsProcessed = 0  var invalidLE = 0; var invalidBE = 0   // Number of invalid chars when decoded as LE or BE.  var bmpCharsLE = 0; var bmpCharsBE = 0 // Number of BMP chars when decoded as LE or BE.   outerLoop:  for (var i = 0; i < bufs.length; i++) {    var buf = bufs[i]    for (var j = 0; j < buf.length; j++) {      b.push(buf[j])      if (b.length === 4) {        if (charsProcessed === 0) {          // Check BOM first.          if (b[0] === 0xFF && b[1] === 0xFE && b[2] === 0 && b[3] === 0) {            return "utf-32le"          }          if (b[0] === 0 && b[1] === 0 && b[2] === 0xFE && b[3] === 0xFF) {            return "utf-32be"          }        }         if (b[0] !== 0 || b[1] > 0x10) invalidBE++        if (b[3] !== 0 || b[2] > 0x10) invalidLE++         if (b[0] === 0 && b[1] === 0 && (b[2] !== 0 || b[3] !== 0)) bmpCharsBE++        if ((b[0] !== 0 || b[1] !== 0) && b[2] === 0 && b[3] === 0) bmpCharsLE++         b.length = 0        charsProcessed++         if (charsProcessed >= 100) {          break outerLoop        }      }    }  }   // Make decisions.  if (bmpCharsBE - invalidBE > bmpCharsLE - invalidLE) return "utf-32be"  if (bmpCharsBE - invalidBE < bmpCharsLE - invalidLE) return "utf-32le"   // Couldn't decide (likely all zeros or not enough data).  return defaultEncoding || "utf-32le"}