MACHIN

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

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+"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, 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() {
+}