diff options
Diffstat (limited to 'node_modules/iconv-lite/encodings/sbcs-codec.js')
-rw-r--r-- | node_modules/iconv-lite/encodings/sbcs-codec.js | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/node_modules/iconv-lite/encodings/sbcs-codec.js b/node_modules/iconv-lite/encodings/sbcs-codec.js new file mode 100644 index 000000000..ca00171b1 --- /dev/null +++ b/node_modules/iconv-lite/encodings/sbcs-codec.js @@ -0,0 +1,72 @@ +"use strict" + +// 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 = new Buffer(codecOptions.chars, 'ucs2'); + + // Encoding buffer. + var encodeBuf = new Buffer(65536); + encodeBuf.fill(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 = new Buffer(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 = new Buffer(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() { +} |