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| author | pack <pack@packgekko.xyz> | 2026-08-09 10:37:07 +0000 |
|---|---|---|
| committer | pack <pack@packgekko.xyz> | 2026-08-09 10:37:07 +0000 |
| commit | 55a4f1fc869e41aca748c63d3018f0448b1606e0 (patch) | |
| tree | d132d1d01772b6d53faee3e63c534dea5706b78a /node_modules/iconv-lite/encodings/utf32.js | |
| download | crud-55a4f1fc869e41aca748c63d3018f0448b1606e0.tar.gz | |
first commit
Diffstat (limited to '')
| -rw-r--r-- | node_modules/iconv-lite/encodings/utf32.js | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/node_modules/iconv-lite/encodings/utf32.js b/node_modules/iconv-lite/encodings/utf32.js new file mode 100644 index 0000000..7e49d7a --- /dev/null +++ b/node_modules/iconv-lite/encodings/utf32.js @@ -0,0 +1,314 @@ +"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 } + +// Aliases +exports.ucs4le = "utf32le" +exports.ucs4be = "utf32be" + +Utf32Codec.prototype.encoder = Utf32Encoder +Utf32Codec.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") + // src.length * 2 covers this chunk's code units (4 bytes each); the extra 4 bytes leave room for a + // high surrogate held over from a previous chunk, which is flushed ahead of this chunk's units. + var dst = Buffer.alloc(src.length * 2 + 4) + 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[0] | (overflow[1] << 8) | (overflow[2] << 16) | (overflow[3] << 24) + } else { + codepoint = overflow[3] | (overflow[2] << 8) | (overflow[1] << 16) | (overflow[0] << 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 () { + if (this.overflow.length === 0) { return } + + // A leftover, incomplete 4-byte code unit at the end of the input is ill-formed. Substitute a + // single U+FFFD (Unicode Standard conformance clause C10) instead of silently dropping the bytes. + this.overflow.length = 0 + return String.fromCharCode(this.badChar) +} + +// == 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 = Utf32AutoCodec +exports.ucs4 = "utf32" + +function Utf32AutoCodec (options, iconv) { + this.iconv = iconv +} + +Utf32AutoCodec.prototype.encoder = Utf32AutoEncoder +Utf32AutoCodec.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" +} |