Merge branch 'master' of https://github.com/rii-mango/JPEGLosslessDecoderJS

Author: rii-mango

README.md

@@ -1,12 +1,25 @@
-# JPEGLosslessDecoderJS
-A JPEG Lossless decoder (JavaScript).
+JPEGLosslessDecoderJS
+=====
+A common DICOM compression format is JPEG Lossless.  This format is generally not supported in standard JPEG decoder libraries. 
+
+This decoder can read the following DICOM transfer syntaxes:
+
+- 1.2.840.10008.1.2.4.57    JPEG Lossless, Nonhierarchical (Processes 14)
+- 1.2.840.10008.1.2.4.70    JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])
+
+###Usage
+See tests/driver.js to run this example:
 
 ```javascript
-var buf = fs.readFileSync('./data/data.lossless');
-var data = toArrayBuffer(buf);
-var decoder = new jpeg.lossless.Decoder(data, 2);
-var output = decoder.decode();
-console.log("compressed size = " + data.byteLength);
-console.log("frame: dimX="+decoder.frame.dimX + " dimY=" + decoder.frame.dimY + " components=" + decoder.frame.numComp);
-console.log("decompressed size = " + output.byteLength);
+var decoder = new jpeg.lossless.Decoder(compressedBytes);  // optional second parameter to specify 1 or 2 byte output
+var decompressedData = decoder.decode();
 ```
+
+###Building
+```shell
+./build.sh # normal build
+./build-min.sh # minimized build
+```
+
+###Acknowledgments
+This library was originally written by Helmut Dersch for Java, later released by JNode.  I added support for selection values 2 to 7 and ported to JavaScript.