Initial commit

node_modules/iconv-lite/encodings/sbcs-codec.js

@@ -0,0 +1,75 @@
+"use strict"
+var Buffer = require("safer-buffer").Buffer
+
+// Single-byte codec. Needs a 'chars' string parameter that contains 256 or 128 chars that
+// correspond to encoded bytes (if 128 - then lower half is ASCII).
+
+exports._sbcs = SBCSCodec
+function SBCSCodec (codecOptions, iconv) {
+  if (!codecOptions) {
+    throw new Error("SBCS codec is called without the data.")
+  }
+
+  // Prepare char buffer for decoding.
+  if (!codecOptions.chars || (codecOptions.chars.length !== 128 && codecOptions.chars.length !== 256)) {
+    throw new Error("Encoding '" + codecOptions.type + "' has incorrect 'chars' (must be of len 128 or 256)")
+  }
+
+  if (codecOptions.chars.length === 128) {
+    var asciiString = ""
+    for (var i = 0; i < 128; i++) {
+      asciiString += String.fromCharCode(i)
+    }
+    codecOptions.chars = asciiString + codecOptions.chars
+  }
+
+  this.decodeBuf = Buffer.from(codecOptions.chars, "ucs2")
+
+  // Encoding buffer.
+  var encodeBuf = Buffer.alloc(65536, iconv.defaultCharSingleByte.charCodeAt(0))
+
+  for (var i = 0; i < codecOptions.chars.length; i++) {
+    encodeBuf[codecOptions.chars.charCodeAt(i)] = i
+  }
+
+  this.encodeBuf = encodeBuf
+}
+
+SBCSCodec.prototype.encoder = SBCSEncoder
+SBCSCodec.prototype.decoder = SBCSDecoder
+
+function SBCSEncoder (options, codec) {
+  this.encodeBuf = codec.encodeBuf
+}
+
+SBCSEncoder.prototype.write = function (str) {
+  var buf = Buffer.alloc(str.length)
+  for (var i = 0; i < str.length; i++) {
+    buf[i] = this.encodeBuf[str.charCodeAt(i)]
+  }
+
+  return buf
+}
+
+SBCSEncoder.prototype.end = function () {
+}
+
+function SBCSDecoder (options, codec) {
+  this.decodeBuf = codec.decodeBuf
+}
+
+SBCSDecoder.prototype.write = function (buf) {
+  // Strings are immutable in JS -> we use ucs2 buffer to speed up computations.
+  var decodeBuf = this.decodeBuf
+  var newBuf = Buffer.alloc(buf.length * 2)
+  var idx1 = 0; var idx2 = 0
+  for (var i = 0; i < buf.length; i++) {
+    idx1 = buf[i] * 2; idx2 = i * 2
+    newBuf[idx2] = decodeBuf[idx1]
+    newBuf[idx2 + 1] = decodeBuf[idx1 + 1]
+  }
+  return newBuf.toString("ucs2")
+}
+
+SBCSDecoder.prototype.end = function () {
+}