1 | "use strict";
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2 | var Buffer = require("safer-buffer").Buffer;
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3 |
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4 |
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5 |
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6 |
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7 | exports._sbcs = SBCSCodec;
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8 | function SBCSCodec(codecOptions, iconv) {
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9 | if (!codecOptions)
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10 | throw new Error("SBCS codec is called without the data.")
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11 |
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12 |
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13 | if (!codecOptions.chars || (codecOptions.chars.length !== 128 && codecOptions.chars.length !== 256))
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14 | throw new Error("Encoding '"+codecOptions.type+"' has incorrect 'chars' (must be of len 128 or 256)");
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15 |
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16 | if (codecOptions.chars.length === 128) {
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17 | var asciiString = "";
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18 | for (var i = 0; i < 128; i++)
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19 | asciiString += String.fromCharCode(i);
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20 | codecOptions.chars = asciiString + codecOptions.chars;
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21 | }
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22 |
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23 | this.decodeBuf = Buffer.from(codecOptions.chars, 'ucs2');
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24 |
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25 |
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26 | var encodeBuf = Buffer.alloc(65536, iconv.defaultCharSingleByte.charCodeAt(0));
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27 |
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28 | for (var i = 0; i < codecOptions.chars.length; i++)
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29 | encodeBuf[codecOptions.chars.charCodeAt(i)] = i;
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30 |
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31 | this.encodeBuf = encodeBuf;
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32 | }
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33 |
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34 | SBCSCodec.prototype.encoder = SBCSEncoder;
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35 | SBCSCodec.prototype.decoder = SBCSDecoder;
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36 |
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37 |
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38 | function SBCSEncoder(options, codec) {
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39 | this.encodeBuf = codec.encodeBuf;
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40 | }
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41 |
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42 | SBCSEncoder.prototype.write = function(str) {
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43 | var buf = Buffer.alloc(str.length);
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44 | for (var i = 0; i < str.length; i++)
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45 | buf[i] = this.encodeBuf[str.charCodeAt(i)];
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46 |
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47 | return buf;
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48 | }
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49 |
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50 | SBCSEncoder.prototype.end = function() {
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51 | }
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52 |
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53 |
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54 | function SBCSDecoder(options, codec) {
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55 | this.decodeBuf = codec.decodeBuf;
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56 | }
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57 |
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58 | SBCSDecoder.prototype.write = function(buf) {
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59 |
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60 | var decodeBuf = this.decodeBuf;
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61 | var newBuf = Buffer.alloc(buf.length*2);
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62 | var idx1 = 0, idx2 = 0;
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63 | for (var i = 0; i < buf.length; i++) {
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64 | idx1 = buf[i]*2; idx2 = i*2;
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65 | newBuf[idx2] = decodeBuf[idx1];
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66 | newBuf[idx2+1] = decodeBuf[idx1+1];
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67 | }
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68 | return newBuf.toString('ucs2');
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69 | }
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70 |
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71 | SBCSDecoder.prototype.end = function() {
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72 | }
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