From 0d048acaca845a86eab8949b685a352376a636af Mon Sep 17 00:00:00 2001
From: Kevin Kelley <kelleyk@kelleyk.net>
Date: Wed, 11 Jan 2017 23:43:50 -0800
Subject: [PATCH] Implement ATEN AST2100 (0x59) support

Tweak heuristic used to identify iKVM servers; it now correctly detects all
of the SuperMicro hardware that we've tested it against.

Modify test case for TightVNC to avoid triggering iKVM heuristic.
---
 README.md                    |   3 +-
 app/ui.js                    |   4 +-
 core/ast2100/README.md       |  49 ++++
 core/ast2100/ast2100.js      | 482 +++++++++++++++++++++++++++++++++++
 core/ast2100/ast2100const.js | 337 ++++++++++++++++++++++++
 core/ast2100/ast2100idct.js  | 214 ++++++++++++++++
 core/ast2100/ast2100util.js  | 284 +++++++++++++++++++++
 core/display.js              |   1 +
 core/rfb.js                  | 203 +++++++++++++--
 karma.conf.js                |   4 +
 tests/frame4.hex             |   1 +
 tests/test.ast2100.js        | 384 ++++++++++++++++++++++++++++
 tests/test.rfb.js            |  34 ++-
 vnc_auto.html                |   4 +-
 14 files changed, 1976 insertions(+), 28 deletions(-)
 create mode 100644 core/ast2100/README.md
 create mode 100644 core/ast2100/ast2100.js
 create mode 100644 core/ast2100/ast2100const.js
 create mode 100644 core/ast2100/ast2100idct.js
 create mode 100644 core/ast2100/ast2100util.js
 create mode 100644 tests/frame4.hex
 create mode 100644 tests/test.ast2100.js

diff --git a/README.md b/README.md
index c926d360..8fb2088a 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,8 @@ WebSockets to TCP socket proxy. There is a python proxy included
     * Original Logo : Michael Sersen
     * tight encoding : Michael Tinglof (Mercuri.ca)
     * pixel format conversion : [Alexander Clouter](http://www.digriz.org.uk/)
-    * ATEN iKVM support : [Alexander Clouter](http://www.digriz.org.uk/)
+    * ATEN iKVM "HARMON" (0x59) support : [Alexander Clouter](http://www.digriz.org.uk/)
+    * ATEN iKVM "AST2100" (0x57) support : [Kevin Kelley](https://github.com/kelleyk)
 
 * Included libraries:
     * as3crypto : Henri Torgemane (code.google.com/p/as3crypto)
diff --git a/app/ui.js b/app/ui.js
index 52ecd88c..a0feae6a 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -70,7 +70,9 @@ var UI;
     WebUtil.load_scripts(
         {'core': ["base64.js", "websock.js", "des.js", "input/keysymdef.js",
                   "input/xtscancodes.js", "input/util.js", "input/devices.js",
-                  "display.js", "inflator.js", "rfb.js", "input/keysym.js"]});
+                  "display.js", "inflator.js", "rfb.js", "input/keysym.js",
+                  "ast2100/ast2100const.js", "ast2100/ast2100util.js",
+                  "ast2100/ast2100idct.js", "ast2100/ast2100.js"]});
 
     window.onscriptsload = function () { UI.load(); };
     /* [end skip-as-module] */
diff --git a/core/ast2100/README.md b/core/ast2100/README.md
new file mode 100644
index 00000000..aeeb791d
--- /dev/null
+++ b/core/ast2100/README.md
@@ -0,0 +1,49 @@
+# AST2100 (0x57) encoding support
+
+These are notes to accompany the ATEN iKVM "AST2100" (0x59) encoding implementation that this branch contains.
+
+This implementation is the product of clean-room reverse engineering (that is, I am not and have never been subject to
+nondisclosure agreements, nor have I had access to proprietary information, related to the subject matter of this
+project).
+
+(c) Copyright 2015-2017 Kevin Kelley <kelleyk@kelleyk.net>
+
+### Current problems / limitations (aka "TODOs")
+
+  - Especially on lower quality settings, you will notice that the picture is not as clear as what the ATEN iKVM client
+    will show you (using the same settings).  I'm aware of this issue and intend to fix it.  Disabling chroma
+    subsampling will allow the encoder to use VQ when there are few colors (e.g. when you are looking at a terminal); VQ
+    data doesn't have the same quality issue.
+
+  - The code could stand to be much better-tested.
+
+  - The JavaScript files related to the AST2100 decoder are loaded even when noVNC does not use the decoder.  It would
+    be nice to lazy-load them only when they are necessary.
+
+  - Lots of globals (functions, constants, etc.) are exposed.  Some quick refactoring could tuck the majority of them
+    away to avoid cluttering the namespace.
+
+### Profiling
+
+  - For some reason, when I use blitImageData() (with the noVNC render queue disabled), that function shows up as the
+    "heaviest" function in Chrome's CPU profiler, even though the function is doing nothing other than evaluating a
+    branch condition or two and then calling _rgbxImageData().  When I call _rgbxImageData() directly, then
+    putImageData() (the Canvas method that's actually doing the heavy lifting) is correctly shown as the "heaviest"
+    function.
+
+  - Profiler oddness aside, putImageData() is overwhelmingly the dominant cost; it seems to occupy 75-85% of the CPU
+    time that noVNC uses.  There are plenty of places that we could get small performance improvements in Ast2100Decoder
+    (and elsewhere in noVNC) but they seem unlikely to have a worthwhile impact, given that fact.
+
+### About the implementation
+
+  - One large, remaining inefficiency is the several times that image data is copied around before being blitted.  The
+    Ast2100Decoder class generates as output 256-element arrays (representing 64 pixels as (R,G,B,A) 4-tuples).  This is
+    exactly what winds up in the ImageData object that is eventually passed to putImageData(); we could just have the
+    decoder write its output directly into those arrays if we wanted.
+
+### Performance questions
+
+  - Is it faster to call putImageData() fewer times with larger buffers?  We could collect groups of blocks (or even an
+    entire frame) and then call putImageData() once.  (Of course, this would require redrawing unchanged regions every
+    frame, too.)
diff --git a/core/ast2100/ast2100.js b/core/ast2100/ast2100.js
new file mode 100644
index 00000000..ce40d647
--- /dev/null
+++ b/core/ast2100/ast2100.js
@@ -0,0 +1,482 @@
+"use strict";
+/*global DCTSIZE, DCTSIZE2, JpegHuffmanTable, BitStream, AST2100IDCT, AAN_IDCT_SCALING_FACTORS, ZIGZAG_ORDER */
+/*global ATEN_QT_LUMA, ATEN_QT_CHROMA, TABLE_CLASS_AC, TABLE_CLASS_DC */
+/*global BITS_AC_LUMA, BITS_AC_CHROMA, BITS_DC_LUMA, BITS_DC_CHROMA, HUFFVAL_AC_LUMA, HUFFVAL_AC_CHROMA, HUFFVAL_DC_LUMA, HUFFVAL_DC_CHROMA */
+/*global inRangeIncl, isEmpty */
+/*global fmt_u8a, fmt_u8, fmt_u16 */
+
+/*
+(c) Copyright 2015-2017 Kevin Kelley <kelleyk@kelleyk.net>.
+
+This implementation is the product of clean-room reverse engineering (that is, I
+am not and have never been subject to enondisclosure agreements, nor have I had
+access to proprietary information, related to the subject matter of this
+project).
+*/
+
+var verboseDebug = false;
+var verboseMcuCount = false;
+var traceUpdates = false;
+var verboseStats = false;
+var verboseVideoSettings = true;
+
+
+var Ast2100Decoder;
+
+
+(function () {
+    "use strict";
+    
+    Ast2100Decoder = function (defaults) {
+
+        this._blitCallback = defaults.blitCallback;
+        this._frame_width = defaults.width;
+        this._frame_height = defaults.height;
+
+        if (!this._frame_width || !this._frame_height)
+            throw 'Missing required parameter: width, height';
+
+        // Either 444u or 422u (though the "422" mode is really 4:2:0, where
+        // chroma is subsampled by a factor of two in each direction)..  Applies
+        // only to JPEG-ish blocks, not to VQ blocks; but VQ blocks seem to only
+        // appear in 4:4:4 color mode.
+        this.subsamplingMode = -1;
+        
+        this.quantTables = [new Int32Array(64), new Int32Array(64)];
+        this._loadedQuantTables = [-1, -1];
+
+        this.huffTables = [
+            [new JpegHuffmanTable({bits: BITS_DC_LUMA, huffval: HUFFVAL_DC_LUMA}),
+             new JpegHuffmanTable({bits: BITS_DC_CHROMA, huffval: HUFFVAL_DC_CHROMA})],
+            [new JpegHuffmanTable({bits: BITS_AC_LUMA, huffval: HUFFVAL_AC_LUMA}),
+             new JpegHuffmanTable({bits: BITS_AC_CHROMA, huffval: HUFFVAL_AC_CHROMA})],
+        ];
+        
+        this._scan_components = [
+            {huffTableSelectorDC: 0, huffTableSelectorAC: 0},  // Y
+            {huffTableSelectorDC: 1, huffTableSelectorAC: 1},  // Cb
+            {huffTableSelectorDC: 1, huffTableSelectorAC: 1}   // Cr
+        ];
+        this._scan_prev_dc = [0, 0, 0];
+
+        this._mcuPosX = 0;
+        this._mcuPosY = 0;
+
+        this._initializeVq();
+
+        // Allocate memory here once and then re-use it.  These buffers store
+        // data after entropy decoding (Huffman, zigzag) and before we dequant
+        // and apply the IDCT.
+        this._tmpBufY = [
+            new Int16Array(DCTSIZE2),
+            new Int16Array(DCTSIZE2),
+            new Int16Array(DCTSIZE2),
+            new Int16Array(DCTSIZE2)];
+        this._tmpBufCb = new Int16Array(DCTSIZE2);
+        this._tmpBufCr = new Int16Array(DCTSIZE2);
+
+        // These buffers store IDCT output.
+        this._componentBufY = [
+            new Uint8Array(DCTSIZE2),
+            new Uint8Array(DCTSIZE2),
+            new Uint8Array(DCTSIZE2),
+            new Uint8Array(DCTSIZE2)];
+        this._componentBufCb = new Uint8Array(DCTSIZE2);
+        this._componentBufCr = new Uint8Array(DCTSIZE2);
+        
+        // The final RGB output goes here; noVNC expects each group of four
+        // elements to represent one RGBA pixel.  this._outputBuf = new
+        // Uint8Array(DCTSIZE2 * 4);
+        this._outputBuf = new Uint8Array(DCTSIZE2 * 4);
+        
+    };
+
+    Ast2100Decoder.prototype = {
+
+        // TODO: Could/should remove this indirection.
+        _idct: function (quant_table, data_unit, dstBuf) {
+            if (!quant_table)
+                throw 'Required argument missing: quant_table';
+            if (!data_unit)
+                throw 'Required argument missing: data_unit';
+            if (!dstBuf)
+                throw 'Required argument missing: dstBuf';
+                
+            return AST2100IDCT.idct_fixed_aan(quant_table, data_unit, dstBuf);
+        },
+
+        _getMcuSize: function () {
+            return {444: 8, 422: 16}[this.subsamplingMode];
+        },
+
+        // Bakes in C(u)*C(v) and the cosine terms (from the IDCT formula).
+        _loadQuantTable: function (slot, srcTable) {
+            for (var y = 0; y < 8; ++y) {
+                for (var x = 0; x < 8; ++x) {
+                    this.quantTables[slot][y*8+x] = ~~(srcTable[y*8+x] * AAN_IDCT_SCALING_FACTORS[x] * AAN_IDCT_SCALING_FACTORS[y] * 65536.0);
+                }
+            }
+        },
+
+        _initializeVq: function () {
+            // These colors are in YCbCr, so they're just black, white, and two
+            // shades of grey.
+            this._vqCodewordLookup = [0, 1, 2, 3];
+            this._vqCodebook = [
+                [0x00, 0x80, 0x80],
+                [0xFF, 0x80, 0x80],
+                [0x80, 0x80, 0x80],
+                [0xC0, 0x80, 0x80]
+            ];
+        },
+
+        // Update our position variables to point at the next MCU.
+        _advancePosition: function () {
+            var mcuSize = this._getMcuSize();
+            var widthInMcus = ~~(this._frame_width / mcuSize);
+            if (this._frame_width % mcuSize != 0)
+                widthInMcus += 1;
+            var heightInMcus = ~~(this._frame_height / mcuSize);
+            if (this._frame_height % mcuSize != 0)
+                heightInMcus += 1;
+
+            this._mcuPosX += 1;
+            if (this._mcuPosX >= widthInMcus) {
+                this._mcuPosX = 0;
+                this._mcuPosY += 1;
+            }
+            if (this._mcuPosY >= heightInMcus) {
+                this._mcuPosY = 0;
+            }
+        },
+
+        // Change the frame's size.
+        setSize: function (width, height) {
+            if (this._frame_width != width || this._frame_height != height)
+                Util.Debug('Ast2100Decoder: frame height changed to '+width+'x'+height);
+            this._frame_width = width;
+            this._frame_height = height;
+        },
+        
+        decode: function (data) {
+            
+            var mcuIdx = 0;
+            if (verboseStats) {
+                var blockTypeCounter = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];  // length 16
+            }
+
+            // Reset state that must be reset between frames.
+            this._scan_prev_dc = [0, 0, 0];
+            this._mcuPosX = 0;
+            this._mcuPosY = 0;
+            
+            // First four bytes.
+            var quantTableSelectorLuma = data[0];  // 0 <= x <= 0xB
+            var quantTableSelectorChroma = data[1];  // 0 <= x <= 0xB
+            var subsamplingMode = (data[2] << 8) | data[3];  // 422u or 444u
+            if (this.subsamplingMode != subsamplingMode) {
+                if (verboseVideoSettings)
+                    console.log('decode(): new subsampling mode: '+subsamplingMode);
+                this.subsamplingMode = subsamplingMode;
+            }
+
+            // The remainder of the stream is byte-swapped in four-byte chunks.
+            // BitStream takes care of this.
+            this._stream = new BitStream({data: data});
+            this._stream.skip(16);
+            this._stream.skip(16);  // do this in two parts because bits must be < 32; thanks JavaScript!
+           
+            if (quantTableSelectorLuma != this._loadedQuantTables[0]) {
+                if (!inRangeIncl(quantTableSelectorLuma, 0, 0xB))
+                    throw 'Out-of-range selector for luma quant table: ' + quantTableSelectorLuma.toString(16);
+                if (verboseVideoSettings)
+                    console.log('decode(): loading new luma quant table: '+fmt_u8(quantTableSelectorLuma));
+                this._loadQuantTable(0, ATEN_QT_LUMA[quantTableSelectorLuma]);
+                this._loadedQuantTables[0] = quantTableSelectorLuma;
+            }
+            if (quantTableSelectorChroma != this._loadedQuantTables[1]) {
+                if (!inRangeIncl(quantTableSelectorChroma, 0, 0xB))
+                    throw 'Out-of-range selector for chroma quant table: ' + quantTableSelectorChroma.toString(16);
+                if (verboseVideoSettings)
+                    console.log('decode(): loading new chroma quant table: '+fmt_u8(quantTableSelectorChroma));
+                this._loadQuantTable(1, ATEN_QT_CHROMA[quantTableSelectorChroma]);
+                this._loadedQuantTables[1] = quantTableSelectorChroma;
+            }
+            if (this.subsamplingMode != 422 && this.subsamplingMode != 444)
+                throw 'Unexpected value for subsamplingMode: 0x' + fmt_u16(this.subsamplingMode);
+            
+            // The remainder of the stream is byte-swapped in four-byte chunks.  BitStream takes care of this.
+            this._stream = new BitStream({data: data});
+            this._stream.skip(16);
+            this._stream.skip(16);  // do this in two parts because bits must be < 32; thanks JavaScript!
+
+            while (true) {
+                var controlFlag = this._stream.read(4);  // uint4
+
+                if (verboseStats)
+                    ++blockTypeCounter[controlFlag];
+                
+                if (verboseMcuCount) {
+                    console.log('MCU #' + mcuIdx + '- Control flag: ' + controlFlag.toString(16));
+                    console.log('  stream pos = ' + this._stream.getPos());
+                }
+
+                if (controlFlag == 0 || controlFlag == 4 || controlFlag == 8 || controlFlag == 0xC) {
+                    // JPEG-ish (DCT-compressed) data.
+                    
+                    if (controlFlag == 8 || controlFlag == 0xC) {
+                        this._mcuPosX = this._stream.read(8);  // uint8
+                        this._mcuPosY = this._stream.read(8);  // uint8
+                        if (traceUpdates)
+                            console.log("decode(): read new MCU pos: (0x"+fmt_u8(this._mcuPosX)+",0x"+fmt_u8(this._mcuPosY)+")");
+                    }
+
+                    if (controlFlag == 4 || controlFlag == 0xC) {
+                        // Haven't seen traffic where this feature is used yet.
+                        throw 'Unexpected control flag: alternate quant table';
+                    }
+
+                    // Since we always have 4:2:2 chroma subsampling on, we'll read 6 blocks (4 Y, 1 Cr, 1 Cb) and
+                    // produce a block of 16x16 pixels.
+                    this._parseMcu();
+
+                } else if (inRangeIncl(controlFlag, 5, 7) || inRangeIncl(controlFlag, 0xD, 0xF)) {
+                    // VQ-compressed data.
+
+                    if (controlFlag >= 0xD) {
+                        this._mcuPosX = this._stream.read(8);  // uint8
+                        this._mcuPosY = this._stream.read(8);  // uint8
+                        if (traceUpdates)
+                            console.log("decode(): read new MCU pos: (0x"+fmt_u8(this._mcuPosX)+",0x"+fmt_u8(this._mcuPosY)+")");
+                    }
+
+                    var codewordSize = (controlFlag & 7) - 5;  // 0 <= codewordSize <= 2
+                    this._parseVqBlock(codewordSize);
+                    
+                } else if (controlFlag == 9) {
+                    // Done with frame!
+                    break;
+                } else {
+                    throw 'Unexpected control flag: unknown value 0x'+fmt_u8(controlFlag);
+                }
+
+                ++mcuIdx;
+            }
+
+            // The 0x9 "end-of-frame" block is included in this count.
+            if (traceUpdates)
+                console.log("decode(): finished after "+mcuIdx+" blocks");
+
+            if (verboseStats) {
+                var counts = {};
+                for (var i = 0; i < 16; ++i)
+                    if (i != 9 && blockTypeCounter[i] > 0)
+                        counts[i] = blockTypeCounter[i];
+                if (!isEmpty(counts))
+                    console.log(counts);
+            }
+            
+        },
+
+        // - Always 8x8, since chroma subsampling does not apply to
+        //   VQ-compressed data.  (As a consequence, VQ blocks only seem to
+        //   appear when DCT chroma subsampling is disabled; that is, in "444"
+        //   mode.)
+        // - Reads 64 * codewordSize bits from the input stream.
+        _parseVqBlock: function (codewordSize) {
+
+            var mcuSize = this._getMcuSize();
+            if (mcuSize != 8)
+                throw 'Unexpected MCU size for VQ block!';
+            if (!inRangeIncl(codewordSize, 0, 2))
+                throw 'Out-of-range codewordSize!';
+
+            var i;
+            
+            var y_buf = this._componentBufY[0];
+            var cb_buf = this._componentBufCb;
+            var cr_buf = this._componentBufCr;
+
+            var that = this;
+            var setColor = function (j, codeword) {
+                var color = that._vqCodebook[that._vqCodewordLookup[codeword]];
+                y_buf[j] = color[0];
+                cb_buf[j] = color[1];
+                cr_buf[j] = color[2];
+            };
+
+            // Read new codebook data.  (That is: new colors for each of our
+            // codewords (the values we'll read from the input data) to map to.)
+            for (i = 0; i < (1 << codewordSize); ++i) {
+                // Read 1b flag and 2b codebook slot number.  if flag is set,
+                // read 24b RGB value and set colors[slot #].  Regardless (?),
+                // set the ith codeowrd to map to this slot.
+                var hasNewColor = this._stream.read(1);
+                var codebookSlotIdx = this._stream.read(2);
+                if (hasNewColor) {
+                    var color = [this._stream.read(8), this._stream.read(8), this._stream.read(8)];  // Y, Cb, Cr
+                    this._vqCodebook[codebookSlotIdx] = color;
+                }
+                this._vqCodewordLookup[i] = codebookSlotIdx;
+            }
+            
+            // Read a block of image data.
+            if (codewordSize == 0) {
+                // Act as though we've got a single-entry codebook.
+                for (i = 0; i < 64; ++i)
+                    setColor(i, 0);
+            } else {
+                for (i = 0; i < 64; ++i)
+                    setColor(i, this._stream.read(codewordSize));
+            }
+
+            // Perform colorspace conversion and copy into destination image buffer.
+            for (var j = 0; j < 64; ++j)
+                this._ycbcrToRgb(this._outputBuf, j, this._componentBufY[0][j], this._componentBufCb[j], this._componentBufCr[j]);
+            
+            this._blitCallback(8 * this._mcuPosX, 8 * this._mcuPosY, 8, 8, this._outputBuf);
+
+            this._advancePosition();
+        },
+
+        _parseMcu: function () {
+
+            var qtLuma = this.quantTables[0];
+            var qtChroma = this.quantTables[1];
+
+            this._parseDataUnit(0, this._tmpBufY[0]);
+            this._idct(qtLuma, this._tmpBufY[0], this._componentBufY[0]);
+            if (this.subsamplingMode != 444) {
+                this._parseDataUnit(0, this._tmpBufY[1]);
+                this._idct(qtLuma, this._tmpBufY[1], this._componentBufY[1]);
+                this._parseDataUnit(0, this._tmpBufY[2]);
+                this._idct(qtLuma, this._tmpBufY[2], this._componentBufY[2]);
+                this._parseDataUnit(0, this._tmpBufY[3]);
+                this._idct(qtLuma, this._tmpBufY[3], this._componentBufY[3]);
+            }
+            this._parseDataUnit(1, this._tmpBufCb);
+            this._idct(qtChroma, this._tmpBufCb, this._componentBufCb);
+            this._parseDataUnit(2, this._tmpBufCr);
+            this._idct(qtChroma, this._tmpBufCr, this._componentBufCr);
+
+            if (this.subsamplingMode != 444) {
+                // 4:2:0 subsampling (x2 in each direction), or what ATEN calls "422" (even though it's not).
+                for (var dy = 0; dy < 2; ++ dy) {
+                    for (var dx = 0; dx < 2; ++dx) {
+                        // for each of the four blocks in this MCU
+                        var componentBufY = this._componentBufY[dx*2+dy];
+                        for (var y = 0; y < 8; ++y) {
+                            for (var x = 0; x < 8; ++x) {
+                                var hy = ~~((8*dx+y)/2);
+                                var hx = ~~((8*dy+x)/2);
+                                this._ycbcrToRgb(this._outputBuf, y*8+x, componentBufY[y*8+x], this._componentBufCb[hy*8+hx], this._componentBufCr[hy*8+hx]);
+                            }
+                        }
+                        this._blitCallback(16 * this._mcuPosX + 8 * dy, 16 * this._mcuPosY + 8 * dx, 8, 8, this._outputBuf);
+                    }
+                }
+            } else {
+                // No subsampling.
+                for (var j = 0; j < 64; ++j)
+                    this._ycbcrToRgb(this._outputBuf, j, this._componentBufY[0][j], this._componentBufCb[j], this._componentBufCr[j]);
+                this._blitCallback(8 * this._mcuPosX, 8 * this._mcuPosY, 8, 8, this._outputBuf);
+            }
+            
+            this._advancePosition();
+        },
+        
+        _parseDataUnit: function (componentIdx, buf) {
+            var scanComponent = this._scan_components[componentIdx];
+            var dc_hufftable = this.huffTables[TABLE_CLASS_DC][scanComponent.huffTableSelectorDC];
+            var ac_hufftable = this.huffTables[TABLE_CLASS_AC][scanComponent.huffTableSelectorAC];
+
+            var setValue = function (i, val) {
+                buf[ZIGZAG_ORDER[i]] = val;
+            };
+            
+            // First element is the DC component, followed by 63 AC components.
+            // The DC component is encoded slightly differently than the AC
+            // components: it is stored as the delta between the value and the
+            // last DC component from the same component.
+            var dc_delta = this._readEncodedValueDC(dc_hufftable);
+            this._scan_prev_dc[componentIdx] += dc_delta;
+            buf[0] = this._scan_prev_dc[componentIdx];
+
+            // Read the AC components.
+            for (var i = 1; i < 64;) {
+                var x = ac_hufftable.readCode(this._stream);
+
+                // N.B.(kelleyk): Renamed r, s to runlen, size.
+                // See ITU T.81 p89 (e.g. Fig F.1).
+                // r is runlength of zeroes; if s==0, r==0 means EOB and r==15
+                // means ZRL.  s is number of bits required to represent the
+                // amplitude that follows the codeword.
+                var runlen = x >>> 4;
+                var size = x & 0x0F;
+
+                if (size == 0) {
+                    if (runlen == 0) {  // special EOB (end-of-block) codeword; fill remainder with zeroes
+                        while (i < 64) {
+                            setValue(i, 0);
+                            ++i;
+                        }
+                        break;
+                    } else if (runlen == 0xF) {  // special ZLE (zero-length-encode) codeword; emit sixteen zeroes
+                        for (var j = 0; j < 16; ++j)
+                            setValue(i + j, 0);
+                        i += 16;
+                        continue;
+                    }
+                }
+
+                // Emit runlen zero entries.
+                for (var j = 0; j < runlen; ++j)
+                    setValue(i + j, 0);
+                i += runlen;
+
+                setValue(i, this._readEncodedValueAC(size));  // category=size
+                i += 1;
+            }
+
+            return buf;
+        },
+
+        _readEncodedValueDC: function (huffTable) {
+            var category = huffTable.readCode(this._stream);
+            return this._readEncodedValueAC(category);
+        },
+        
+        _readEncodedValueAC: function (category) {
+            if (category == 0)
+                return 0;
+
+            var value;  // sint32
+            var val_sign = this._stream.read(1);
+
+            if (val_sign == 0) {
+                // Negative (unlike the more common two's-complement
+                // representation).
+                value = -(1 << category) + 1;
+            } else {
+                value = (1 << category - 1);
+            }
+
+            if (category > 1) {
+                var more_bits = this._stream.read(category - 1);  // uint
+                value += more_bits;
+            }
+
+            return value;
+        },
+
+        _ycbcrToRgb: function (outputBuf, outputOffset, y, cb, cr) {
+            outputOffset *= 4;
+            outputBuf[outputOffset + 0] = clamp(YUVTORGB_Y_TABLE[y] + YUVTORGB_CR_R_TABLE[cr]);
+            outputBuf[outputOffset + 1] = clamp(YUVTORGB_Y_TABLE[y] + YUVTORGB_CR_G_TABLE[cr] + YUVTORGB_CB_G_TABLE[cb]);
+            outputBuf[outputOffset + 2] = clamp(YUVTORGB_Y_TABLE[y] + YUVTORGB_CB_B_TABLE[cb]);
+            outputBuf[outputOffset + 3] = 0xFF;  // noVNC expects alpha
+        }
+        
+    };
+        
+})();
diff --git a/core/ast2100/ast2100const.js b/core/ast2100/ast2100const.js
new file mode 100644
index 00000000..87d94576
--- /dev/null
+++ b/core/ast2100/ast2100const.js
@@ -0,0 +1,337 @@
+/* (c) Copyright 2015-2017 Kevin Kelley <kelleyk@kelleyk.net>. */
+
+
+// JPEG zigzag tables
+var ZIGZAG_ORDER = [
+    0, 1, 8, 16, 9, 2, 3, 10,
+    17, 24, 32, 25, 18, 11, 4, 5,
+    12, 19, 26, 33, 40, 48, 41, 34,
+    27, 20, 13, 6, 7, 14, 21, 28,
+    35, 42, 49, 56, 57, 50, 43, 36,
+    29, 22, 15, 23, 30, 37, 44, 51,
+    58, 59, 52, 45, 38, 31, 39, 46,
+    53, 60, 61, 54, 47, 55, 62, 63,
+];
+var DEZIGZAG_ORDER = [
+    0,  1,  5,  6, 14, 15, 27, 28,
+    2,  4,  7, 13, 16, 26, 29, 42,
+    3,  8, 12, 17, 25, 30, 41, 43,
+    9, 11, 18, 24, 31, 40, 44, 53,
+    10, 19, 23, 32, 39, 45, 52, 54,
+    20, 22, 33, 38, 46, 51, 55, 60,
+    21, 34, 37, 47, 50, 56, 59, 61,
+    35, 36, 48, 49, 57, 58, 62, 63,
+];
+
+
+// Huffman tables
+var BITS_DC_LUMA = [0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0];
+var HUFFVAL_DC_LUMA = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
+var BITS_DC_CHROMA = [0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0];
+var HUFFVAL_DC_CHROMA = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
+var BITS_AC_LUMA = [0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d];
+var HUFFVAL_AC_LUMA = [
+    0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+    0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+    0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+    0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+    0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+    0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+    0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+    0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+    0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+    0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+    0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+    0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+    0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+    0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+    0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+    0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+    0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+    0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+    0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+    0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+    0xf9, 0xfa
+];
+var BITS_AC_CHROMA = [0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77];
+var HUFFVAL_AC_CHROMA  = [
+    0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+    0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+    0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+    0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+    0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+    0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+    0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+    0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+    0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+    0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+    0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+    0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+    0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+    0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+    0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+    0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+    0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+    0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+    0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+    0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+    0xf9, 0xfa
+];
+
+
+// Quant tables
+var ATEN_QT_LUMA = [
+    [
+        0x14, 0x0D, 0x0C, 0x14, 0x1E, 0x32, 0x3F, 0x4C,
+        0x0F, 0x0F, 0x11, 0x17, 0x20, 0x48, 0x4B, 0x44,
+        0x11, 0x10, 0x14, 0x1E, 0x32, 0x47, 0x56, 0x46,
+        0x11, 0x15, 0x1B, 0x24, 0x3F, 0x6C, 0x64, 0x4D,
+        0x16, 0x1B, 0x2E, 0x46, 0x55, 0x88, 0x80, 0x60,
+        0x1E, 0x2B, 0x44, 0x50, 0x65, 0x82, 0x8D, 0x73,
+        0x3D, 0x50, 0x61, 0x6C, 0x80, 0x97, 0x96, 0x7E,
+        0x5A, 0x73, 0x76, 0x7A, 0x8C, 0x7D, 0x80, 0x7B,
+    ], [
+        0x11, 0x0C, 0x0A, 0x11, 0x1A, 0x2B, 0x37, 0x42,
+        0x0D, 0x0D, 0x0F, 0x14, 0x1C, 0x3F, 0x41, 0x3C,
+        0x0F, 0x0E, 0x11, 0x1A, 0x2B, 0x3E, 0x4B, 0x3D,
+        0x0F, 0x12, 0x18, 0x1F, 0x37, 0x5F, 0x57, 0x43,
+        0x13, 0x18, 0x28, 0x3D, 0x4A, 0x77, 0x70, 0x54,
+        0x1A, 0x26, 0x3C, 0x46, 0x58, 0x71, 0x7B, 0x64,
+        0x35, 0x46, 0x55, 0x5F, 0x70, 0x84, 0x83, 0x6E,
+        0x4E, 0x64, 0x67, 0x6B, 0x7A, 0x6D, 0x70, 0x6C,
+    ], [
+        0x0E, 9, 9, 0x0E, 0x15, 0x24, 0x2E, 0x37,
+        0x0A, 0x0A, 0x0C, 0x11, 0x17, 0x34, 0x36, 0x31,
+        0x0C, 0x0B, 0x0E, 0x15, 0x24, 0x33, 0x3E, 0x32,
+        0x0C, 0x0F, 0x13, 0x1A, 0x2E, 0x4E, 0x48, 0x38,
+        0x10, 0x13, 0x21, 0x32, 0x3D, 0x62, 0x5D, 0x45,
+        0x15, 0x1F, 0x31, 0x3A, 0x49, 0x5E, 0x66, 0x53,
+        0x2C, 0x3A, 0x46, 0x4E, 0x5D, 0x6D, 0x6C, 0x5B,
+        0x41, 0x53, 0x56, 0x58, 0x65, 0x5A, 0x5D, 0x59,
+    ], [
+        0x0B, 7, 7, 0x0B, 0x11, 0x1C, 0x24, 0x2B,
+        8, 8, 0x0A, 0x0D, 0x12, 0x29, 0x2B, 0x27,
+        0x0A, 9, 0x0B, 0x11, 0x1C, 0x28, 0x31, 0x28,
+        0x0A, 0x0C, 0x0F, 0x14, 0x24, 0x3E, 0x39, 0x2C,
+        0x0C, 0x0F, 0x1A, 0x28, 0x30, 0x4E, 0x4A, 0x37,
+        0x11, 0x19, 0x27, 0x2E, 0x3A, 0x4A, 0x51, 0x42,
+        0x23, 0x2E, 0x38, 0x3E, 0x4A, 0x56, 0x56, 0x48,
+        0x33, 0x42, 0x44, 0x46, 0x50, 0x47, 0x4A, 0x47,
+    ], [
+        9, 6, 5, 9, 0x0D, 0x16, 0x1C, 0x22,
+        6, 6, 7, 0x0A, 0x0E, 0x20, 0x21, 0x1E,
+        7, 7, 9, 0x0D, 0x16, 0x20, 0x26, 0x1F,
+        7, 9, 0x0C, 0x10, 0x1C, 0x30, 0x2D, 0x22,
+        0x0A, 0x0C, 0x14, 0x1F, 0x26, 0x3D, 0x39, 0x2B,
+        0x0D, 0x13, 0x1E, 0x24, 0x2D, 0x3A, 0x3F, 0x33,
+        0x1B, 0x24, 0x2B, 0x30, 0x39, 0x44, 0x43, 0x38,
+        0x28, 0x33, 0x35, 0x37, 0x3F, 0x38, 0x39, 0x37,
+    ], [
+        6, 4, 3, 6, 9, 0x0F, 0x13, 0x16,
+        4, 4, 5, 7, 9, 0x15, 0x16, 0x14,
+        5, 4, 6, 9, 0x0F, 0x15, 0x19, 0x15,
+        5, 6, 8, 0x0A, 0x13, 0x20, 0x1E, 0x17,
+        6, 8, 0x0D, 0x15, 0x19, 0x28, 0x26, 0x1C,
+        9, 0x0D, 0x14, 0x18, 0x1E, 0x27, 0x2A, 0x22,
+        0x12, 0x18, 0x1D, 0x20, 0x26, 0x2D, 0x2D, 0x25,
+        0x1B, 0x22, 0x23, 0x24, 0x2A, 0x25, 0x26, 0x25,
+    ], [
+        3, 2, 1, 3, 4, 7, 9, 0x0B,
+        2, 2, 2, 3, 4, 0x0A, 0x0B, 0x0A,
+        2, 2, 3, 4, 7, 0x0A, 0x0C, 0x0A,
+        2, 3, 4, 5, 9, 0x10, 0x0F, 0x0B,
+        3, 4, 6, 0x0A, 0x0C, 0x14, 0x13, 0x0E,
+        4, 6, 0x0A, 0x0C, 0x0F, 0x13, 0x15, 0x11,
+        9, 0x0C, 0x0E, 0x10, 0x13, 0x16, 0x16, 0x12,
+        0x0D, 0x11, 0x11, 0x12, 0x15, 0x12, 0x13, 0x12,
+    ], [
+        2, 1, 1, 2, 3, 5, 6, 7,
+        1, 1, 1, 2, 3, 7, 7, 6,
+        1, 1, 2, 3, 5, 7, 8, 7,
+        1, 2, 2, 3, 6, 0x0A, 0x0A, 7,
+        2, 2, 4, 7, 8, 0x0D, 0x0C, 9,
+        3, 4, 6, 8, 0x0A, 0x0D, 0x0E, 0x0B,
+        6, 8, 9, 0x0A, 0x0C, 0x0F, 0x0F, 0x0C,
+        9, 0x0B, 0x0B, 0x0C, 0x0E, 0x0C, 0x0C, 0x0C,
+    ], [
+        2, 1, 1, 2, 3, 5, 6, 7,
+        1, 1, 1, 2, 3, 7, 7, 6,
+        1, 1, 2, 3, 5, 7, 8, 7,
+        1, 2, 2, 3, 6, 0x0A, 0x0A, 7,
+        2, 2, 4, 7, 8, 0x0D, 0x0C, 9,
+        3, 4, 6, 8, 0x0A, 0x0D, 0x0E, 0x0B,
+        6, 8, 9, 0x0A, 0x0C, 0x0F, 0x0F, 0x0C,
+        9, 0x0B, 0x0B, 0x0C, 0x0E, 0x0C, 0x0C, 0x0C,
+    ], [
+        1, 1, 1, 1, 2, 3, 4, 5,
+        1, 1, 1, 1, 2, 5, 5, 5,
+        1, 1, 1, 2, 3, 5, 6, 5,
+        1, 1, 2, 2, 4, 8, 7, 5,
+        1, 2, 3, 5, 6, 0x0A, 9, 7,
+        2, 3, 5, 6, 7, 9, 0x0A, 8,
+        4, 6, 7, 8, 9, 0x0B, 0x0B, 9,
+        6, 8, 8, 9, 0x0A, 9, 9, 9,
+    ], [
+        1, 1, 1, 1, 1, 2, 3, 3,
+        1, 1, 1, 1, 1, 3, 3, 3,
+        1, 1, 1, 1, 2, 3, 4, 3,
+        1, 1, 1, 1, 3, 5, 5, 3,
+        1, 1, 2, 3, 4, 6, 6, 4,
+        1, 2, 3, 4, 5, 6, 7, 5,
+        3, 4, 4, 5, 6, 7, 7, 6,
+        4, 5, 5, 6, 7, 6, 6, 6,
+    ], [
+        1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 1, 1,
+        1, 1, 1, 1, 1, 1, 2, 1,
+        1, 1, 1, 1, 1, 2, 2, 1,
+        1, 1, 1, 1, 2, 3, 3, 2,
+        1, 1, 1, 2, 2, 3, 3, 2,
+        1, 2, 2, 2, 3, 3, 3, 3,
+        2, 2, 2, 3, 3, 3, 3, 3,
+    ]
+];
+
+var ATEN_QT_CHROMA = [
+    [
+        0x1F, 0x21, 0x2D, 0x58, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x21, 0x27, 0x30, 0x7B, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x2D, 0x30, 0x69, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x58, 0x7B, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+        0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9, 0x0B9,
+    ], [
+        0x1B, 0x1D, 0x27, 0x4C, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x1D, 0x22, 0x2A, 0x6B, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x27, 0x2A, 0x5B, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x4C, 0x6B, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+        0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0, 0x0A0,
+    ], [
+        0x16, 0x18, 0x20, 0x3F, 0x85, 0x85, 0x85, 0x85,
+        0x18, 0x1C, 0x22, 0x58, 0x85, 0x85, 0x85, 0x85,
+        0x20, 0x22, 0x4B, 0x85, 0x85, 0x85, 0x85, 0x85,
+        0x3F, 0x58, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
+        0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
+        0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
+        0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
+        0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85,
+    ], [
+        0x12, 0x13, 0x1A, 0x33, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x13, 0x16, 0x1C, 0x48, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x1A, 0x1C, 0x3D, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x33, 0x48, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+        0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C, 0x6C,
+    ], [
+        0x0D, 0x0E, 0x13, 0x26, 0x50, 0x50, 0x50, 0x50,
+        0x0E, 0x11, 0x15, 0x35, 0x50, 0x50, 0x50, 0x50,
+        0x13, 0x15, 0x2D, 0x50, 0x50, 0x50, 0x50, 0x50,
+        0x26, 0x35, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50,
+        0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50,
+        0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50,
+        0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50,
+        0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50,
+    ], [
+        9, 0x0A, 0x0D, 0x1A, 0x37, 0x37, 0x37, 0x37,
+        0x0A, 0x0B, 0x0E, 0x25, 0x37, 0x37, 0x37, 0x37,
+        0x0D, 0x0E, 0x1F, 0x37, 0x37, 0x37, 0x37, 0x37,
+        0x1A, 0x25, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
+        0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
+        0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
+        0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
+        0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37, 0x37,
+    ], [
+        4, 5, 6, 0x0D, 0x1B, 0x1B, 0x1B, 0x1B,
+        5, 5, 7, 0x12, 0x1B, 0x1B, 0x1B, 0x1B,
+        6, 7, 0x0F, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+        0x0D, 0x12, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+        0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+        0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+        0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+        0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B, 0x1B,
+    ], [
+        3, 3, 4, 8, 0x12, 0x12, 0x12, 0x12,
+        3, 3, 4, 0x0C, 0x12, 0x12, 0x12, 0x12,
+        4, 4, 0x0A, 0x12, 0x12, 0x12, 0x12, 0x12,
+        8, 0x0C, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
+        0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
+        0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
+        0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
+        0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12, 0x12,
+    ], [
+        2, 2, 3, 7, 0x0F, 0x0F, 0x0F, 0x0F,
+        2, 3, 4, 0x0A, 0x0F, 0x0F, 0x0F, 0x0F,
+        3, 4, 8, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+        7, 0x0A, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+        0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+        0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+        0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+        0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F,
+    ], [
+        2, 2, 3, 5, 0x0C, 0x0C, 0x0C, 0x0C,
+        2, 2, 3, 8, 0x0C, 0x0C, 0x0C, 0x0C,
+        3, 3, 7, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+        5, 8, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+        0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+        0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+        0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+        0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
+    ], [
+        1, 1, 2, 4, 9, 9, 9, 9,
+        1, 1, 2, 6, 9, 9, 9, 9,
+        2, 2, 5, 9, 9, 9, 9, 9,
+        4, 6, 9, 9, 9, 9, 9, 9,
+        9, 9, 9, 9, 9, 9, 9, 9,
+        9, 9, 9, 9, 9, 9, 9, 9,
+        9, 9, 9, 9, 9, 9, 9, 9,
+        9, 9, 9, 9, 9, 9, 9, 9,
+    ], [
+        1, 1, 1, 2, 6, 6, 6, 6,
+        1, 1, 1, 4, 6, 6, 6, 6,
+        1, 1, 3, 6, 6, 6, 6, 6,
+        2, 4, 6, 6, 6, 6, 6, 6,
+        6, 6, 6, 6, 6, 6, 6, 6,
+        6, 6, 6, 6, 6, 6, 6, 6,
+        6, 6, 6, 6, 6, 6, 6, 6,
+        6, 6, 6, 6, 6, 6, 6, 6,
+    ]
+];
+
+/*
+ Ref.: libjpeg's jddctmgr.c:
+    "For float AA&N IDCT method, multipliers are equal to quantization
+     coefficients scaled by scalefactor[row]*scalefactor[col], where
+       scalefactor[0] = 1
+       scalefactor[k] = cos(k*PI/16) * sqrt(2)    for k=1..7
+*/
+var AAN_IDCT_SCALING_FACTORS = [
+    1.0, 1.387039845, 1.306562965, 1.175875602,
+    1.0, 0.785694958, 0.541196100, 0.275899379,
+];
+
+
+var YUVTORGB_CR_G_TABLE = new Int32Array(256);
+var YUVTORGB_CR_R_TABLE = new Int32Array(256);
+var YUVTORGB_CB_G_TABLE = new Int32Array(256);
+var YUVTORGB_CB_B_TABLE = new Int32Array(256);
+var YUVTORGB_Y_TABLE = new Int32Array(256);
+for (var i = 0; i < 256; ++i) {
+    YUVTORGB_CR_G_TABLE[i] = (0x688000 - i * 0xD000) >> 16;
+    YUVTORGB_CR_R_TABLE[i] = (0xFF340000 + i * 0x19900) >> 16;
+    YUVTORGB_CB_G_TABLE[i] = (0x328000 - i * 0x6400) >> 16;
+    YUVTORGB_CB_B_TABLE[i] = (0xFEFE8000 + i * 0x20400) >> 16;
+    YUVTORGB_Y_TABLE[i] = (0xFFEDE040 + i * 0x129FC) >> 16;
+}
+
+
+var TABLE_CLASS_DC = 0;
+var TABLE_CLASS_AC = 1;
+var DCTSIZE = 8;
+var DCTSIZE2 = DCTSIZE * DCTSIZE;
diff --git a/core/ast2100/ast2100idct.js b/core/ast2100/ast2100idct.js
new file mode 100644
index 00000000..5677c4f1
--- /dev/null
+++ b/core/ast2100/ast2100idct.js
@@ -0,0 +1,214 @@
+/* (c) Copyright 2015-2017 Kevin Kelley <kelleyk@kelleyk.net>. */
+
+
+var AST2100IDCT;
+
+
+// N.B.: These values assume CONST_BITS == 8
+var FIX_1_082392200 = 277;  // fix(1.082392200)
+var FIX_1_414213562 = 362;  // fix(1.414213562)
+var FIX_1_847759065 = 473;  // fix(1.847759065)
+var FIX_2_613125930 = 669;  // fix(2.613125930)
+
+
+var MAXJSAMPLE = 255;  // largest value of a sample; 8-bit, so 2**8-1
+var CONST_BITS = 8;
+var PASS1_BITS = 0;
+
+// This is like clamp() except that it also adds the MAXJSAMPLE/2 offset.
+var range_limit = function (x) {
+    // XXX(kelleyk): This offset is baked into the range limit table in the ATEN
+    // stuff and in libjpeg; see commpent above prepare_range_limit_table() in
+    // jdmaster.c.
+    x += 128;
+    
+    return Math.max(0, Math.min(255, x));
+};
+
+// Convert float to fixed-point.
+var fix = function (x) {
+    return ~~(x * (1 << CONST_BITS) + 0.5);
+};
+
+var fixed_dequant = function (scaled_quant_table, buf, i) {
+    // N.B.: The data in buf is unscaled; the data in scaled_quant_table has
+    // been scaled by 1<<16.
+    return fixed_mul(scaled_quant_table[i], buf[i]);
+};
+
+var descale = function (x, n) {
+    // console.log([x, x>>n, (x>>n)+128]);
+    return x >> n;
+};
+
+// if not accurate rounding mode...
+var idescale = descale;
+// else use better implementation
+
+// N.B.(kelleyk): This isn't a libjpeg parameter; it just means that ATEN
+// downshifts all the way back to "normal ints" at the end of pass 1.
+var END_PASS1_DESCALE_BITS = CONST_BITS;
+
+var fixed_mul = function (a, b) {
+    return descale(a * b, CONST_BITS);
+};
+
+
+(function () {
+    "use strict";
+
+    AST2100IDCT = {
+
+        // Uses the 16/16 integer representation that ATEN and libjpeg's
+        // jidctfst.c ("fast, not-so-accurate integer IDCT") do.  Note that, for
+        // performance, this routine *also* incorporates the dequantization
+        // step, which is why it takes scaled_quant_table as an argument.  (This
+        // argument does not actually contain "just" a scaled quant table; some
+        // constants have been pre-multiplied into it.  See the function that
+        // loads quant tables for more details.)
+        idct_fixed_aan: function (scaled_quant_table, buf, dstBuf) {
+
+            // ATEN rounds things off early, at a cost to precision: the int32
+            // values in 'workspace' are not scaled at all.
+            var workspace = new Int32Array(64);
+    
+            for (var x = 0; x < 8; ++x)
+                AST2100IDCT._aan_idct_col(scaled_quant_table, buf, workspace, x);
+                
+            for (var y = 0; y < 8; ++y)
+                AST2100IDCT._aan_idct_row(scaled_quant_table, dstBuf, workspace, y);
+                
+            return dstBuf;
+        },
+
+        // Columns; aka "Pass 1".
+        _aan_idct_col: function(scaled_quant_table, buf, workspace, x) {
+
+            var dequant = function (idx) { return fixed_dequant(scaled_quant_table, buf, idx); };
+            var mul = fixed_mul;
+
+            var y;
+
+            var all_ac_zero = true;
+            for (y = 1; y < 8; ++y) {
+                if (buf[8 * y + x] != 0) {
+                    all_ac_zero = false;
+                    break;
+                }
+            }
+            if (all_ac_zero) {
+                var raw_dcval = buf[8 * 0 + x];
+                var quant_val = scaled_quant_table[8 * 0 + x];
+                var dcval = idescale(dequant(8 * 0 + x), END_PASS1_DESCALE_BITS);  // in total, >> 16
+                for (y = 0; y < 8; ++y)
+                    workspace[8 * y + x] = dcval;
+                return;
+            }
+    
+            // Even part.
+            var tmp0 = dequant(8 * 0 + x);
+            var tmp1 = dequant(8 * 2 + x);
+            var tmp2 = dequant(8 * 4 + x);
+            var tmp3 = dequant(8 * 6 + x);
+            
+            var tmp10 = tmp0 + tmp2;  // Phase 3
+            var tmp11 = tmp0 - tmp2;
+
+            var tmp13 = tmp1 + tmp3;  // Phases 5-3
+            var tmp12 = mul((tmp1 - tmp3), FIX_1_414213562) - tmp13;  // 2 * c4
+
+            tmp0 = tmp10 + tmp13;
+            tmp3 = tmp10 - tmp13;
+            tmp1 = tmp11 + tmp12;
+            tmp2 = tmp11 - tmp12;
+
+            // Odd part.
+            var tmp4 = dequant(8 * 1 + x);
+            var tmp5 = dequant(8 * 3 + x);
+            var tmp6 = dequant(8 * 5 + x);
+            var tmp7 = dequant(8 * 7 + x);
+            
+            var z13 = tmp6 + tmp5;  // Phase 6
+            var z10 = tmp6 - tmp5;
+            var z11 = tmp4 + tmp7;
+            var z12 = tmp4 - tmp7;
+
+            tmp7 = z11 + z13;  // Phase 5
+            tmp11 = mul((z11 - z13), FIX_1_414213562);  // 2 * c4
+    
+            var z5 = mul((z10 + z12), FIX_1_847759065);  // 2 * c2
+            tmp10 = mul(FIX_1_082392200, z12) - z5;  // 2 * (c2-c6)
+            tmp12 = mul(-FIX_2_613125930, z10) + z5;
+
+            tmp6 = tmp12 - tmp7;
+            tmp5 = tmp11 - tmp6;
+            tmp4 = tmp10 + tmp5;
+
+            workspace[x + 8 * 0] = idescale(tmp0 + tmp7, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 7] = idescale(tmp0 - tmp7, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 1] = idescale(tmp1 + tmp6, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 6] = idescale(tmp1 - tmp6, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 2] = idescale(tmp2 + tmp5, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 5] = idescale(tmp2 - tmp5, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 4] = idescale(tmp3 + tmp4, END_PASS1_DESCALE_BITS);
+            workspace[x + 8 * 3] = idescale(tmp3 - tmp4, END_PASS1_DESCALE_BITS);
+            
+        },
+        
+        // Rows; aka "Pass 2".
+        _aan_idct_row: function(scaled_quant_table, buf, workspace, y) {
+
+            var wsptr = function (x) { return workspace[8 * y + x]; };
+            var mul = fixed_mul;
+
+            // Even part.
+            var tmp10 = wsptr(0) + wsptr(4);
+            var tmp11 = wsptr(0) - wsptr(4);
+            
+            var tmp13 = wsptr(2) + wsptr(6);
+            var tmp12 = mul((wsptr(2) - wsptr(6)), FIX_1_414213562) - tmp13;
+
+            var tmp0 = tmp10 + tmp13;
+            var tmp3 = tmp10 - tmp13;
+            var tmp1 = tmp11 + tmp12;
+            var tmp2 = tmp11 - tmp12;
+
+            // Odd part.
+            var z13 = wsptr(5) + wsptr(3);
+            var z10 = wsptr(5) - wsptr(3);
+            var z11 = wsptr(1) + wsptr(7);
+            var z12 = wsptr(1) - wsptr(7);
+
+            var tmp7 = z11 + z13;
+            tmp11 = mul((z11 - z13), FIX_1_414213562);
+
+            var z5 = mul((z10 + z12), FIX_1_847759065);  // 2 * c2
+            tmp10 = mul(FIX_1_082392200, z12) - z5;  // 2 * (c2-c6)
+            tmp12 = mul(-FIX_2_613125930, z10) + z5;
+
+            var tmp6 = tmp12 - tmp7;
+            var tmp5 = tmp11 - tmp6;
+            var tmp4 = tmp10 + tmp5;
+
+            var set_out = function (x, val) {
+                // Shift right by PASS1_BITS bits to convert back to a normal
+                // int, and then by another 3 to divide by 8.
+                val = idescale(val, PASS1_BITS + 3);                
+                val = range_limit(val);  // This also applies the +128 offset.
+                buf[y * 8 + x] = val;
+            };
+    
+            // Final output stage: scale down by a factor of 8 and range-limit
+            set_out(0, tmp0 + tmp7);
+            set_out(7, tmp0 - tmp7);
+            set_out(1, tmp1 + tmp6);
+            set_out(6, tmp0 - tmp6);
+            set_out(2, tmp2 + tmp5);
+            set_out(5, tmp2 - tmp5);
+            set_out(4, tmp3 + tmp4);
+            set_out(3, tmp3 - tmp4);
+        }
+        
+    };
+
+})();
diff --git a/core/ast2100/ast2100util.js b/core/ast2100/ast2100util.js
new file mode 100644
index 00000000..3dea96e7
--- /dev/null
+++ b/core/ast2100/ast2100util.js
@@ -0,0 +1,284 @@
+/* (c) Copyright 2015-2017 Kevin Kelley <kelleyk@kelleyk.net>. */
+
+
+function fmt_rgb_buf (n, buf) {
+    var s = "";
+    for (var y = 0; y < n; ++y) {
+        for (var x = 0; x < n; ++x) {
+            var offset = ((y*n)+x)*4;
+            s += fmt_u8(buf[offset+0]) + fmt_u8(buf[offset+1]) + fmt_u8(buf[offset+2]) + fmt_u8(buf[offset+3]) + ' ';
+        }
+        s += '\n';
+    }
+    return s;
+}
+
+var fmt_u8 = function (x) {
+    var pad = '00';
+    var s = x.toString(16);
+    return pad.substring(0, pad.length - s.length) + s;
+};
+var fmt_u16 = function (x) {
+    var pad = '0000';
+    var s = x.toString(16);
+    return pad.substring(0, pad.length - s.length) + s;
+};
+var fmt_u32 = function (x) {  // cheesy way to ger around the sign bit
+    return fmt_u16(x >>> 16) + fmt_u16(x & 0xFFFF);
+};
+
+var fmt_s8 = function (x) {
+    if (x < 0)
+        x += (1 << 8);
+    return fmt_u8(x);
+};
+
+var fmt_s16 = function (x) {
+    if (x < 0)
+        x += (1 << 16);
+    return fmt_u16(x);
+};
+
+var fmt_s32 = function (x) {
+    if (x < 0)
+        x += (1 << 32);
+    return fmt_u32(x);
+};
+
+var fmt_array = function(f, xx) {
+    xx = Array.from(xx);  // if xx is a typed array, the strings fmt_u8 returns will be silently coerced back to numbers
+    return '[' + xx.map(f).join(', ') + ']';
+};
+
+
+var fmt_u8a = function (xx) { return fmt_array(fmt_u8, xx); };
+var fmt_u16a = function (xx) { return fmt_array(fmt_u16, xx); };
+var fmt_u32a = function (xx) { return fmt_array(fmt_u32, xx); };
+var fmt_s8a = function (xx) { return fmt_array(fmt_s8, xx); };
+var fmt_s16a = function (xx) { return fmt_array(fmt_s16, xx); };
+var fmt_s32a = function (xx) { return fmt_array(fmt_s32, xx); };
+
+
+var inRangeIncl = function (x, a, b) {
+    return (x >= a && x <= b);
+};
+var inRange = function (x, a, b) {
+    return (x >= a && x < b);
+};
+
+var swap32 = function (val) {
+    return ((val & 0xFF) << 24)
+        | ((val & 0xFF00) << 8)
+        | ((val >> 8) & 0xFF00)
+        | ((val >> 24) & 0xFF);
+};
+
+var arrayEq = function (a, b) {
+    if (a.length != b.length)
+        return false;
+    for (var i = 0; i < a.length; ++i)
+        if (a[i] != b[i])
+            return false;
+    return true;
+};
+
+var isEmpty = function (obj) {
+    for(var prop in obj)
+        if(obj.hasOwnProperty(prop))
+            return false;
+    return true;
+};
+
+var clamp = function (x) {
+    x = ~~x;
+    if (x <= 0)
+        return 0;
+    if (x >= 255)
+        return 255;
+    return x;
+};
+
+
+var BitStream;
+var JpegHuffmanTable;
+
+
+(function () {
+    "use strict";
+    
+    BitStream = function (defaults) {
+
+        // ATEN scan data does not treat 0xFF bytes specially.
+        this._interpretMarkers = false;
+        // True iff we've encountered "end-of-image".
+        this._eoi = false;
+
+        this._data = defaults.data;  // uint8[]
+        if (this._data === undefined)
+            throw 'BitStream constructor requires argument "data"!';
+        
+        this._nextDword = 0;  // uint8
+
+        // Fill the readbuf and reservoir with the first two dwords in the data
+        // buffer.
+        this._reservoir = 0;
+        this._bitsInReservoir = 0;
+        this._refill();
+        this._readbuf = this._reservoir;
+        this._reservoir = 0;
+        this._bitsInReservoir = 0;
+        this._refill();
+    };
+
+    BitStream.prototype = {
+        getPos: function () {
+            return (this._nextDword * 32) - (32 + this._bitsInReservoir);
+        },
+        skip: function (bits) {
+            while (bits > 0) {
+                var n = Math.min(32, bits);
+                this.read(n);
+                bits -= n;
+            }
+        },
+        read: function (bits) {
+            // JavaScript's bitwise operators have this limitation.
+            if (bits >= 32)
+                throw 'Number of bits must be less than 32.';
+            
+            // this.checkInvariants();
+
+            var that = this;
+            var moveFromReservoir = function (n) {
+                that._readbuf = (that._readbuf << n) | (that._reservoir >>> (32 - n));
+                that._reservoir <<= n;
+                that._bitsInReservoir -= n;
+            };
+            
+            var retval = this._readbuf >>> (32 - bits);  // same as this.peek(bits)
+
+            if (bits > this._bitsInReservoir) {
+                bits -= this._bitsInReservoir;
+                moveFromReservoir(this._bitsInReservoir);
+                this._refill();
+            }
+            moveFromReservoir(bits);
+            
+            return retval;
+        },
+        _refill: function () {
+            // this.checkInvariants();
+            
+            // N.B.: Must use >>> for unsigned shift; >> is sra.
+            if (this._bitsInReservoir != 0)
+                throw 'Oops: in _refill(),  bitsInReservoir='+this._bitsInReservoir;
+            for (var i = 0; i < 4; ++i) {
+                var x = this._data[(4 * this._nextDword) + i];
+                if (x === undefined)
+                    throw 'BitStream overran available data!';
+                // TODO: if interpretMarkers ...
+                this._reservoir = (this._reservoir << 8) | x;
+                this._bitsInReservoir += 8;
+            }
+            this._nextDword += 1;
+
+            this._reservoir = swap32(this._reservoir);
+            
+            // this.checkInvariants();
+        },
+        peek: function (bits) {
+            if (bits >= 32)  // due to the fact that the bitwise operators have this limitation
+                throw 'Number of bits must be less than 32.';
+            
+            // this.checkInvariants();
+            return this._readbuf >>> (32 - bits);
+        },
+        showDebug: function () {
+            console.log('stream readbuf='+fmt_u32(this._readbuf)+' reservoir='+fmt_u32(this._reservoir)+' bitsLeft='+this._bitsInReservoir+'d nextDword='+fmt_u16(this._nextDword));
+        },
+        checkInvariants: function () {
+            var err = null;
+            
+            if (this._bitsInReservoir < 0 || this._bitsInReservoir > 32)
+                err = 'Oops: BitStream invariant violated:  bitsInReservoir='+this._bitsInReservoir;
+
+            if (err) {
+                console.log(err);
+                this.showDebug();
+                throw err;
+            }
+        }
+        
+    };   
+    
+    JpegHuffmanTable = function (defaults) {
+        if (!defaults)
+            defaults = {};
+        if (!defaults.bits || !defaults.huffval)
+            throw 'Arguments bits, huffval are required.';
+
+        this._huffsize = new Uint8Array(1<<16);
+        this._huffval_lookup = new Uint8Array(1<<16);
+        // 1 to 16, plus a useless 0th element to make indexing nicer.
+        this._bits = new Uint8Array(17);
+        
+        this._buildTables(defaults.bits, defaults.huffval);
+    };
+    
+    JpegHuffmanTable.prototype = {
+        
+        _buildTables: function (bits, huffval) {
+            // First, copy BITS.
+            for (var i = 0; i < 17; ++i) {
+                this._bits[i] = bits[i];
+                
+                // This follows from the fact that the all-ones codeword of each
+                // length is reserved as a prefix for longer codewords, which
+                // implies that there may not be more than (2**i)-1 codewords of
+                // length i bits.
+                if ((1 << i) <= bits[i])
+                    throw 'Oops: bad BITS.';
+            }
+
+            // Calculate Huffman codewords.  The best explanation for this is a
+            // graphical one.  Refer to 'Binary Tree Expansin of DHT' figure
+            // here:
+            // http://www.impulseadventure.com/photo/jpeg-huffman-coding.html.
+            var next_codeword = 0;
+            var codeword_qty = 0;
+            var codeword_idx = 0;  // index into HUFFVAL
+            for (var code_len = 1; code_len < 17; ++code_len) {
+                for (var i = 0; i < this._bits[code_len]; ++i) {
+                    for (var j = 0; j < (1 << (16 - code_len)); ++j) {
+                        this._huffsize[next_codeword + j] = code_len;
+                        this._huffval_lookup[next_codeword + j] = huffval[codeword_idx];
+                    }
+                    next_codeword += (1 << (16 - code_len));
+                    codeword_idx += 1;
+                }
+            }
+            if (codeword_idx != huffval.length)
+                throw 'Oops: all codewords should be used!';
+        },
+        
+        // Reads the next code from the stream.  Consumes up to 16 bits.
+        // Returns the corresponding codeword (the value that the code
+        // represents, which is always exactly one byte).
+        readCode: function (stream) {
+            // Some number of bits, 16 < x <= 0, on the least-significant end of
+            // this 16b value are not relevant, depoending on how long the code
+            // actually is.  However, we've built our lookup tables so that,
+            // regardless of what value the irrelevant bits have, we will get
+            // the same result.
+            var fixedlenCode = stream.peek(16);  // uint16
+            
+            var codeLen = this._huffsize[fixedlenCode];
+            stream.skip(codeLen);
+            var codeword = this._huffval_lookup[fixedlenCode];
+            return codeword;
+        }
+        
+    };
+        
+})();
+
diff --git a/core/display.js b/core/display.js
index 5a6df0e6..a61b22f6 100644
--- a/core/display.js
+++ b/core/display.js
@@ -467,6 +467,7 @@
                 // but it's a lot of extra work for not a lot of payoff -- if we're using the render queue,
                 // this probably isn't getting called *nearly* as much
                 var new_arr = new Uint8Array(width * height * 4);
+                // XXX(kelleyk): Why are we allocating *two* new arrays here?
                 new_arr.set(new Uint8Array(arr.buffer, 0, new_arr.length));
                 this._renderQ_push({
                     'type': 'blit',
diff --git a/core/rfb.js b/core/rfb.js
index 9c630841..6218127e 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -21,9 +21,11 @@
  * import XK2HID from "./input/keysym";
  * import XtScancode from "./input/xtscancodes";
  * import Inflator from "./inflator.mod";
+ * import Ast2100Decoder from "./ast2100/ast2100";
+ * import arrayEq from "./ast2100/ast2100util";
  */
 /*jslint white: false, browser: true */
-/*global window, Util, Display, Keyboard, Mouse, Websock, Websock_native, Base64, DES, KeyTable, Inflator, XtScancode */
+/*global window, Util, Display, Keyboard, Mouse, Websock, Websock_native, Base64, DES, KeyTable, Inflator, XtScancode, Ast2100Decoder, arrayEq */
 
 /* [module] export default */ function RFB(defaults) {
     "use strict";
@@ -44,6 +46,7 @@
     this._rfb_disconnect_reason = "";
 
     this._rfb_tightvnc = false;
+    this._rfb_atenikvm = false;
     this._rfb_xvp_ver = 0;
 
     // In preference order
@@ -54,7 +57,13 @@
         ['HEXTILE',              0x05 ],
         ['RRE',                  0x02 ],
         ['RAW',                  0x00 ],
-        ['ATEN',                 0x59 ],
+
+        // ATEN iKVM encodings
+        ['ATEN_AST2100',        0x57 ],
+        ['ATEN_ASTJPEG',        0x58 ],
+        ['ATEN_HERMON',         0x59 ],
+        ['ATEN_YARKON',         0x60 ],
+        ['ATEN_PILOT3',         0x61 ],
 
         // Psuedo-encoding settings
 
@@ -369,6 +378,13 @@
             }
         },
 
+        // Tell the ATEN iKVM server to change the quantization tables and/or
+        // type of subsampling that it uses to encode video.
+        atenChangeVideoSettings: function (lumaQt, chromaQt, subsamplingMode) {
+            RFB.messages.atenChangeVideoSettings(this._sock, lumaQt, chromaQt, subsamplingMode);
+            this._sock.flush();
+        },
+
 
         // Private methods
 
@@ -803,6 +819,8 @@
                 this._rfb_auth_scheme = 0;
                 var types = this._sock.rQshiftBytes(num_types);
                 Util.Debug("Server security types: " + types);
+                // N.B.(kelleyk): Deliberately copy-constructed, since the underlying array is reused.
+                this._rfb_server_supported_security_types = Array.from(types);
                 for (var i = 0; i < types.length; i++) {
                     switch (types[i]) {
                         case 1: // None
@@ -841,8 +859,9 @@
             var aten_sep = this._aten_password_sep;
             var aten_auth = this._rfb_password.split(aten_sep);
             if (aten_auth.length < 2) {
-                this._onPasswordRequired(this, 'ATEN iKVM credentials required (user' + aten_sep +
-                                  'password) -- got only ' + this._rfb_password);
+                this._onPasswordRequired(
+                    this,
+                    'ATEN iKVM credentials required (user' + aten_sep + 'password)');
                 return false;
             }
 
@@ -850,6 +869,7 @@
             this._convert_color = true;
 
             if (this._rfb_tightvnc) {
+                // N.B.(kelleyk): We've already "skipped" the four bytes that we read into numTunnels.
                 this._rfb_tightvnc = false;
             } else {
                 this._sock.rQskipBytes(4);
@@ -904,6 +924,8 @@
         },
 
         _negotiate_tight_tunnels: function (numTunnels) {
+            // N.B.(kelleyk): For a full of known tunnel types, see:
+            // https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#tight-security-type
             var clientSupportedTunnelTypes = {
                 0: { vendor: 'TGHT', signature: 'NOTUNNEL' }
             };
@@ -934,15 +956,30 @@
         },
 
         _negotiate_tight_auth: function () {
-            var numTunnels;  // NB(directxman12): this is only in scope within the following block,
+            var numTunnels = 0;  // NB(directxman12): this is only in scope within the following block,
                              //                   or if equal to zero (necessary for ATEN iKVM support)
             if (!this._rfb_tightvnc) {  // first pass, do the tunnel negotiation
                 if (this._sock.rQwait("num tunnels", 4)) { return false; }
                 numTunnels = this._sock.rQshift32();
-                if (this._rfb_version === 3.8 && (numTunnels & 0xffff0ff0) >>> 0 === 0xaff90fb0) { return this._negotiate_aten_auth(); }
-                if (numTunnels > 0 && this._sock.rQwait("tunnel capabilities", 16 * numTunnels, 4)) { return false; }
-
                 this._rfb_tightvnc = true;
+                
+                // N.B.(kelleyk): I can only find about a half-dozen known tunnel
+                // types, so TightVNC should be sending a relatively small number
+                // here, whereas the ATEN servers send four bytes that, when
+                // interpreted as a u32, represent a very large number.  (The
+                // condition I've chosen below just checks that the first byte
+                // is nonzero.)  Further, TightVNC servers seem to be support
+                // both 0x02 and 0x10 security types, whereas ATEN iKVM servers
+                // advertise only support for 0x10.  (Are there *other* VNC
+                // servers that only support 0x10?)
+                if (this._rfb_version === 3.8 &&
+                        arrayEq(this._rfb_server_supported_security_types, [0x10]) &&
+                        (numTunnels <= 0 || numTunnels > 0x1000000)) {
+                    Util.Info('Detected ATEN iKVM server (using heuristic #0 -- ' +
+                              'older Winbond/Nuvoton or Renesas BMC?).');
+                    return this._negotiate_aten_auth();
+                }
+                if (numTunnels > 0 && this._sock.rQwait("tunnel capabilities", 16 * numTunnels, 4)) { return false; }
 
                 if (numTunnels > 0) {
                     this._negotiate_tight_tunnels(numTunnels);
@@ -960,9 +997,14 @@
 
             if (this._sock.rQwait("sub auth capabilities", 16 * subAuthCount, 4)) { return false; }
 
-            // Newer X10 Supermicro motherboards get here
-            if (this._rfb_version === 3.8 && numTunnels === 0 && subAuthCount === 0) {
-                Util.Warn("Newer ATEN iKVM detected, you may get an 'unsupported encoding 87'");
+            // Newer X10 Supermicro motherboards get here.
+            // N.B.(kelleyk): If we had trouble with this heuristic matching
+            // non-ATEN servers, we could also add the "only security type 0x10
+            // is supported" condition from above.
+            if (this._rfb_version === 3.8 &&
+                    numTunnels === 0 &&
+                    (subAuthCount === 0 || (subAuthCount & 0xFFFF) == 0x0100)) {
+                Util.Info('Detected ATEN iKVM server (using heuristic #1 -- newer AST2400 BMC?).');
                 return this._negotiate_aten_auth();
             }
             
@@ -1156,7 +1198,7 @@
             // - X9DRL-3F/X9DRL-6F
             // - X10SLD
             //
-            // Not supported (uses encoding 87):
+            // Supported using the ATEN "AST2100" encoding (0x57 / 87):
             // - X10SL7-F
             // - X10SLD-F
             // - X10SLM-F
@@ -1177,7 +1219,10 @@
                 this._fb_width                = 10000;
                 this._fb_height               = 10000;
 
-                // lies about what it supports
+                // TODO(kelleyk): This message (and this block of code) is part
+                // of the original ATEN "HERMON" (0x59) support.  The "AST2100"
+                // (0x57) encoding delivers RGB888 color.  I suppose that we should
+                // update this somehow?  What effect does it have?
                 Util.Warn("ATEN iKVM lies and only does 15 bit depth with RGB555");
                 this._convert_color            = true;
                 this._pixelFormat.bpp         = 16;
@@ -1560,6 +1605,9 @@
                         return false;
                     }
 
+                    // TODO(kelleyk): We should probably modify this condition so
+                    // that this can only happen when we are using the ATEN_HERMON
+                    // encoding, and not other ATEN encodings. --
                     // ATEN uses 0x00 even when it is meant to be 0x59
                     if (this._rfb_atenikvm && this._FBU.encoding === 0x00) {
                         this._FBU.encoding = 0x59;
@@ -1877,6 +1925,26 @@
             sock._sQlen += 18;
         },
 
+        atenChangeVideoSettings: function (sock, lumaQt, chromaQt, subsamplingMode) {
+            if (!inRangeIncl(lumaQt, 0, 0xB))
+                throw 'Bad value: must have 0 <= lumaQt <= 0xB';
+            if (!inRangeIncl(chromaQt, 0, 0xB))
+                throw 'Bad value: must have 0 <= chromaQt <= 0xB';
+            if (subsamplingMode != 422 && subsamplingMode != 444)
+                throw 'Bad value: subsamplingMode must be one of 444, 422';
+
+            var buf = sock._sQ;
+            var offset = sock._sQlen;
+
+            buf[offset] = 0x32;
+            buf[offset + 1] = lumaQt;
+            buf[offset + 2] = chromaQt;
+            buf[offset + 3] = subsamplingMode >>> 8;
+            buf[offset + 4] = subsamplingMode;
+
+            sock._sQlen += 5;
+        },
+
         pointerEvent: function (sock, x, y, mask) {
             var buff = sock._sQ;
             var offset = sock._sQlen;
@@ -2766,12 +2834,12 @@
             Util.Error("Server sent compress level pseudo-encoding");
         },
 
-        ATEN: function () {
+        ATEN_HERMON: function () {
             if (this._FBU.aten_len === -1) {
                 this._FBU.bytes = 8;
-                if (this._sock.rQwait("ATEN", this._FBU.bytes)) { return false; }
+                if (this._sock.rQwait("ATEN_HERMON", this._FBU.bytes)) { return false; }
                 this._FBU.bytes = 0;
-                this._sock.rQskipBytes(4);
+                this._sock.rQskipBytes(4); // N.B.(kelleyk): This is the "mysteryFlag".
                 this._FBU.aten_len = this._sock.rQshift32();
 
                 if (this._FBU.width === 64896 && this._FBU.height === 65056) {
@@ -2784,25 +2852,25 @@
                     return true;
                 }
                 if (this._fb_width !== this._FBU.width && this._fb_height !== this._FBU.height) {
-                    Util.Debug(">> ATEN resize desktop");
+                    Util.Debug(">> ATEN_HERMON resize desktop");
                     this._fb_width = this._FBU.width;
                     this._fb_height = this._FBU.height;
                     this._onFBResize(this, this._fb_width, this._fb_height);
                     this._display.resize(this._fb_width, this._fb_height);
-                    Util.Debug("<< ATEN resize desktop");
+                    Util.Debug("<< ATEN_HERMON resize desktop");
                 }
             }
 
             if (this._FBU.aten_type === -1) {
                 this._FBU.bytes = 10;
-                if (this._sock.rQwait("ATEN", this._FBU.bytes)) { return false; }
+                if (this._sock.rQwait("ATEN_HERMON", this._FBU.bytes)) { return false; }
                 this._FBU.bytes = 0;
                 this._FBU.aten_type = this._sock.rQshift8();
                 this._sock.rQskip8();
 
                 this._sock.rQskipBytes(4); // number of subrects
                 if (this._FBU.aten_len !== this._sock.rQshift32()) {
-                    return this._fail('ATEN RAW len mis-match');
+                    return this._fail('ATEN_HERMON RAW len mis-match');
                 }
                 this._FBU.aten_len -= 10;
             }
@@ -2811,7 +2879,7 @@
                 switch (this._FBU.aten_type) {
                     case 0: // Subrects
                         this._FBU.bytes = 6 + (16 * 16 * this._pixelFormat.Bpp);  // at least a subrect
-                        if (this._sock.rQwait("ATEN", this._FBU.bytes)) { return false; }
+                        if (this._sock.rQwait("ATEN_HERMON", this._FBU.bytes)) { return false; }
                         var a = this._sock.rQshift16();
                         var b = this._sock.rQshift16();
                         var y = this._sock.rQshift8();
@@ -2828,7 +2896,7 @@
                         if (this._FBU.bytes > 0) return false;
                         break;
                     default:
-                        return this._fail('unknown ATEN type: '+this._FBU.aten_type);
+                        return this._fail('unknown ATEN_HERMON type: '+this._FBU.aten_type);
                 }
             }
 
@@ -2843,6 +2911,97 @@
             this._FBU.aten_len = -1;
             this._FBU.aten_type = -1;
 
+            return true;
+        },
+
+        ATEN_AST2100: function () {
+           
+            if (this._FBU.aten_len === -1) {
+                this._FBU.bytes = 8;
+                if (this._sock.rQwait("ATEN_AST2100", this._FBU.bytes)) { return false; }
+
+                // N.B.(kelleyk): I think that the mysteryFlag is 0 when in
+                // "text mode" (at the BIOS, without X started, etc.) and 1 when
+                // running X.  Perhaps it's something to do with what mode the
+                // "video card" is being used in?
+                var mysteryFlag = this._sock.rQshift32();
+                // if (mysteryFlag != 0)
+                //     console.log('Nonzero mysteryFlag (='+mysteryFlag+')!  When does this occur?');
+                this._FBU.aten_len = this._sock.rQshift32();
+            }
+
+            // Actually read the data.
+            if (this._FBU.aten_len !== 0) {
+                this._FBU.bytes = this._FBU.aten_len;
+                if (this._sock.rQwait("ATEN_AST2100", this._FBU.bytes)) { return false; }
+                var data = this._sock.rQshiftBytes(this._FBU.aten_len);
+            }
+            
+            // Without this, the code in _framebufferUpdate() will keep looping
+            // instead of realizing that it's finished and sending out a
+            // FramebufferUpdateRequest.  It's important to make sure this code
+            // is called as soon as we have read any data we are going to read:
+            // in particular, it must be called BEFORE we might return true
+            // ("we're done").  Otherwise... infinite loop!
+            this._FBU.rects -= 1;
+            if (this._FBU.rects != 0)
+                throw 'Unexpected number of rects in FramebufferUpdate message; should always be 1!';
+            
+            // N.B.(kelleyk): It's also very important for the way that this
+            // function works that aten_len wind up -1 before we ever return
+            // true; otherwise we'll fail to parse the two extra, ATEN-specific
+            // header fields (see above) the next time we get a FramebufferUpdate
+            // message.
+            this._FBU.aten_len = -1;
+
+            // These are -640 and -480 (as int16s), as in the other ATEN encodings.
+            if (this._FBU.width === 64896 && this._FBU.height === 65056) {
+                Util.Debug('Ast2100Decoder: screen is off.');
+                if (this._FBU.aten_len !== 0)
+                    Util.Warn('Ast2100Decoder: warning: framebuffer dimensions ' +
+                              'indicate that screen is off but data length is nonzero.');
+                return true;
+            } else if (this._FBU.aten_len === 0) {
+                // This seems to happen when the display is off (e.g. when you
+                // tell the machine to restart).
+                // TODO(kelleyk): Is there a way to tell noVNC that the display
+                // is "off"?  Should we show a black screen, or otherwise indicate
+                // to the user that this is what is going on?
+                Util.Warn('Ast2100Decoder: warning: data length is zero, but ' +
+                          'framebuffer dimensions are not -640x-480 (which is ' +
+                          'typically given to indicate that the screen is off).');
+                return true;
+            }
+
+            if (!this._aten_ast2100_dec) {
+                var display = this._display;
+                this._aten_ast2100_dec = new Ast2100Decoder({
+                    width: this._FBU.width,
+                    height: this._FBU.height,
+                    blitCallback: function (x, y, width, height, buf) {
+                        // Last arguments here are offset, from_queue.  'from_queue'
+                        // means 'should this block be rendered from the queue?', not
+                        // 'is this block being rendered from the queue?'.  It causes
+                        // the block to be enqueued instead of being blitted right
+                        // away via a call to _rgbxImageData().
+                        display.blitRgbxImage(x, y, width, height, buf, 0, true);
+                    }
+                });
+            }
+            
+            // N.B.(kelleyk): Copied this block from ATEN_HERMON above.
+            if (this._fb_width !== this._FBU.width && this._fb_height !== this._FBU.height) {
+                Util.Debug(">> ATEN_AST2100 resize desktop");
+                this._fb_width = this._FBU.width;
+                this._fb_height = this._FBU.height;
+                this._onFBResize(this, this._fb_width, this._fb_height);
+                this._display.resize(this._fb_width, this._fb_height);
+                Util.Debug("<< ATEN_AST2100 resize desktop");
+                
+                this._aten_ast2100_dec.setSize(this._FBU.width, this._FBU.height);
+            }
+
+            this._aten_ast2100_dec.decode(data);
             return true;
         }
     };
diff --git a/karma.conf.js b/karma.conf.js
index 5f3c20b9..07afe5a0 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -123,6 +123,10 @@ module.exports = function(config) {
       'core/des.js',
       'core/display.js',
       'core/inflator.js',
+      'core/ast2100/ast2100const.js',
+      'core/ast2100/ast2100util.js',
+      'core/ast2100/ast2100idct.js',
+      'core/ast2100/ast2100.js',
       'tests/test.*.js'
     ],
 
diff --git a/tests/frame4.hex b/tests/frame4.hex
new file mode 100644
index 00000000..bd2d11f9
--- /dev/null
+++ b/tests/frame4.hex
@@ -0,0 +1 @@
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diff --git a/tests/test.ast2100.js b/tests/test.ast2100.js
new file mode 100644
index 00000000..d1b46b68
--- /dev/null
+++ b/tests/test.ast2100.js
@@ -0,0 +1,384 @@
+// requires local modules: ast2100, ast2100idct, ast2100const, ast2100util
+/* jshint expr: true */
+
+var assert = chai.assert;
+var expect = chai.expect;
+
+
+// Convert a hex string, optionally containing spaces, into an array of integers representing bytes.
+var parseHex = function (s) {
+    s = s.replace(/\s/g, '');
+    if (s.length % 2 != 0)
+        throw 'Hex data has uneven length!';
+    for (var bytes = [], i = 0; i < s.length; i += 2)
+        bytes.push(parseInt(s.substr(i, 2), 16));
+    return bytes;
+};
+
+
+function make_decoder () {
+    return new Ast2100Decoder({
+        width: 0x400,
+        height: 0x300,
+        blitCallback: function () {}
+    });
+}
+
+// Swap u32 byte order.  Mutates input!
+function buf_swap32 (data) {
+    for (var i = 0; i < data.length; i += 4) {
+        var tmp;
+    
+        tmp = data[i+0];
+        data[i+0] = data[i+3];
+        data[i+3] = tmp;
+        
+        tmp = data[i+1];
+        data[i+1] = data[i+2];
+        data[i+2] = tmp;
+    }
+    
+    return data;
+}
+
+
+describe('ATEN_AST2100 video encoding', function() {
+    "use strict";
+    
+    var dec;
+    beforeEach(function () {
+        dec = make_decoder();
+        dec._mcuLimit = 10;
+    });
+
+    describe('BitStream', function() {
+        var stream, stream2, stream3;
+        var data = buf_swap32(parseHex('f0f0 cccc cccc cccc cccc cccc cccc cccc'));
+        var data2 = parseHex('F0F1F2F3 F4F5F6F7 F8F9FAFB FCFDFEFF');
+        var data3 = parseHex('0b0b01bc45fbc5e020040101ffff3f20c0ffffff0000240000000000000000005028140a0000000000000000');
+        
+        beforeEach(function () {
+            stream = new BitStream({data: data});
+            stream2 = new BitStream({data: data2});
+            stream3 = new BitStream({data: data3});
+        });
+
+        it('should pass simple sanity checks', function () {
+            expect(stream.read(4)).to.equal(0xF);
+            expect(stream.read(4)).to.equal(0x0);
+            expect(stream.read(4)).to.equal(0xF);
+            expect(stream.read(4)).to.equal(0x0);
+        });
+        
+        it('should pass simple sanity checks (part II)', function () {
+            var i;
+            for (i = 0; i < 4; ++i)
+                expect(stream.read(1)).to.equal(1);
+            for (i = 0; i < 4; ++i)
+                expect(stream.read(1)).to.equal(0);
+        });
+        
+        it('should be able to properly refill the buffer', function () {
+            expect(stream.read(4)).to.equal(0xF);
+            expect(stream.read(4)).to.equal(0x0);
+            expect(stream.read(4)).to.equal(0xF);
+            expect(stream.read(8)).to.equal(0x0C);
+        });
+        
+        it('should properly swap byte order', function () {
+            expect(stream2.read(8)).to.equal(0xF3);
+            expect(stream2.read(8)).to.equal(0xF2);
+            expect(stream2.read(8)).to.equal(0xF1);
+            expect(stream2.read(8)).to.equal(0xF0);
+            expect(stream2.read(8)).to.equal(0xF7);
+        });
+        
+        it('should properly handle skipping the full 32-bit read-buffer (data3)', function () {
+            // Must do this in two parts so that bits < 32 each time.
+            stream3.skip(16);
+            stream3.skip(16);
+            expect(stream3.read(4)).to.equal(0xE);
+        });
+        
+        // it('issue repro', function () {
+        //     var data = parseHex('f0f0 cccc cccc cccc cccc cccc cccc cccc');
+        //     var stream = new BitStream({data: data});
+        //     expect(stream.read(31)).to.equal(0xF0F0CCCC >>> 1);
+        //     expect(stream.read(8)).to.equal(0x66);
+        // });        
+    });
+             
+    describe('quant tables', function() {
+        it('quant tables are properly loaded and scaled', function () {
+            // This is luma quant table #4.
+            var expected = Int32Array.from([
+                0x00090000, 0x0008527e, 0x00068866, 0x000a9537, 0x000d0000, 0x00114908, 0x000f274b, 0x0009616d,
+                0x0008527e, 0x000b8b14, 0x000caf8f, 0x00104f53, 0x00136b26, 0x0022df8f, 0x0018c594, 0x000b7b02,
+                0x0009255c, 0x000caf8f, 0x000f5d2c, 0x0013f8fd, 0x001cbe90, 0x0020d994, 0x001adebc, 0x000b2cc4,
+                0x00083b2b, 0x000eadca, 0x00126faf, 0x00161f78, 0x0020ecad, 0x002c58a1, 0x001ca316, 0x000b07c7,
+                0x000a0000, 0x0010a4fc, 0x001a219a, 0x002473bf, 0x00260000, 0x002fed69, 0x001ed922, 0x000bdd19,
+                0x000a36ca, 0x0014b4bd, 0x001ecbfa, 0x00214279, 0x00235b34, 0x0023cdea, 0x001ac9de, 0x000b0e2f,
+                0x000e9cbf, 0x001b0616, 0x001e67d4, 0x001e8bd4, 0x001ed922, 0x001cea24, 0x00139fb4, 0x00085c96,
+                0x000b0935, 0x00138450, 0x00131afd, 0x0011d7e1, 0x001161b4, 0x000c23a7, 0x000882d0, 0x00042fc6
+            ]);
+
+            dec._loadQuantTable(0, ATEN_QT_LUMA[4]);
+            var luma_quant_table = dec.quantTables[0];
+            expect(luma_quant_table).to.deep.equal(expected);
+        });
+    });
+    
+    describe('IDCT', function () {
+
+        var outputBuf;
+        
+        beforeEach(function () {
+            outputBuf = new Uint8Array(DCTSIZE2);  // equivalent to one of the componentBufs in Ast2100Decoder.
+        });
+
+        // TODO: Fix typing: variables should be typed arrays.
+        it('test case 0 - DC value only', function () {
+            
+            // this is the output of the VLC / entropy coding process
+            // XXX: @KK: Why is this 16-bit?
+            var dataUnit = [  // new Int16Array(
+                0xFF9C,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
+
+            var expected_idct_output = Uint8Array.from([  // new Uint8Array(
+                0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,
+                0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,
+                0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF]);
+
+            dec._loadQuantTable(0, ATEN_QT_LUMA[4]);
+            var luma_quant_table = dec.quantTables[0];
+            
+            AST2100IDCT.idct_fixed_aan(luma_quant_table, dataUnit, outputBuf);
+
+            // console.log(result);
+
+            console.log('expected:');
+            console.log(fmt_u8a(expected_idct_output));
+            console.log('result:');
+            console.log(fmt_u8a(outputBuf));
+            
+            expect(outputBuf).to.deep.equal(expected_idct_output);
+            
+        });
+
+        it('test case 1', function () {
+            // this is the output of the VLC / entropy coding process
+            // XXX: @KK: Why is this 16-bit?
+            var dataUnit = Int16Array.from([
+                0xFFBD,0,0,0,0,0,0,0,
+                0xFFC3,0,0,0,0,0,0,0,
+                0x26,0,0,0,0,0,0,0,
+                0xFFED,0,0,0,0,0,0,
+                0,0,0,0,0,0,0,0,0,
+                6,0,0,0,0,0,0,0,
+                0xFFFC,0,0,0,0,0,0,0,
+                2,0,0,0,0,0,0,0]);
+
+            var expected = Uint8Array.from([
+                0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,
+                0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,
+                0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,
+                0xE,0xE,0xE,0xE,0xE,0xE,0xE,0xE,
+                0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,
+                0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,
+                0x9F,0x9F,0x9F,0x9F,0x9F,0x9F,0x9F,0x9F,
+                0xA1,0xA1,0xA1,0xA1,0xA1,0xA1,0xA1,0xA1]);
+
+            dec._loadQuantTable(0, ATEN_QT_LUMA[4]);
+            var luma_quant_table = dec.quantTables[0];
+
+            AST2100IDCT.idct_fixed_aan(luma_quant_table, dataUnit, outputBuf);
+
+            /*
+            console.log('expected:');
+            console.log(fmt_u8a(expected));
+            console.log('result:');
+            console.log(fmt_u8a(outputBuf));
+             */
+
+            // XXX: TEMPORARY -- figure out this rounding issue
+            // expect(result).to.deep.equal(expected);
+            var maxErr = 0;
+            for (i = 0; i < 64; ++i)
+                maxErr = Math.max(maxErr, Math.abs(outputBuf[i] - expected[i]));
+            if (maxErr > 1)
+                throw 'Error too high!';
+            
+        });
+        
+        it('test case 2', function () {
+            // this is the output of the VLC / entropy coding process
+            // XXX: @KK: Why is this 16-bit?
+            
+            var dataUnit = Int16Array.from([
+                0xFF9B, 0, 0, 0, 0, 0, 0, 0, 0xFFA4, 0, 0, 0, 0, 0, 0, 0, 0x35, 0, 0, 0, 0, 0, 0, 0,
+                0xFFE6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0xFFFA,
+                0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0]);
+            
+            var expected = [
+                0xE, 0xE, 0xE, 0xE, 0xE, 0xE, 0xE, 0xE, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13,
+                0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13, 0x13,
+                0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0xD, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14,
+                0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1];
+
+             // Between IDCT passes, the workspace should look like this:
+            //  [-903, 0, 0, 0, 0, 0, 0, 0, -874, 0, 0, 0, 0, 0, 0, 0, -914, 0, 0, 0, 0, 0, 0, 0, -874, 0, 0, 0, 0, 0, 0, 0,
+            //   -915, 0, 0, 0, 0, 0, 0, 0, -868, 0, 0, 0, 0, 0, 0, 0, 230, 0, 0, 0, 0, 0, 0, 0, 266, 0, 0, 0, 0, 0, 0, 0]
+            
+            
+            dec._loadQuantTable(0, ATEN_QT_LUMA[5]);
+            var luma_quant_table = dec.quantTables[0];
+
+            AST2100IDCT.idct_fixed_aan(luma_quant_table, dataUnit, outputBuf);
+
+            // console.log(result);
+
+            console.log('expected:');
+            console.log(fmt_u8a(expected));
+            console.log('result:');
+            console.log(fmt_u8a(outputBuf));
+
+            // XXX: TEMPORARY -- figure out this rounding issue
+            // expect(result).to.deep.equal(expected);
+            var maxErr = 0;
+            for (i = 0; i < 64; ++i)
+                maxErr = Math.max(maxErr, Math.abs(outputBuf[i] - expected[i]));
+            if (maxErr > 1)
+                throw 'Error too high!';
+        });
+        
+    });
+
+    describe('VQ', function () {
+        
+        it('should successfully load a codebook (colors)', function () {
+            var data = buf_swap32(parseHex('bc010b0b e0c5fb45 01010420 203fffff ffffffc0 00240000 00000000 00000000 0a142850'));
+            data = data.slice(4);
+            
+            var stream = new BitStream({data: data});  // Strip off quant table selectors and subsampling mode.
+            var controlFlag = stream.read(4);
+            expect(controlFlag).to.equal(0xE);
+
+            var xMcuPos = stream.read(8), yMcuPos = stream.read(8);
+            expect(xMcuPos).to.equal(0xC);
+            expect(yMcuPos).to.equal(0x5F);
+            
+            dec.subsamplingMode = 444;  // required or an assertion in the VQ code will fail
+            dec._stream = stream;
+            dec._parseVqBlock(1);  // codewordSize=1
+            expect(dec._vqCodewordLookup).to.deep.equal([1, 0, 2, 3]);
+            expect(dec._vqCodebook).to.deep.equal([
+                [0x10, 0x80, 0x80],
+                [0xA2, 0x80, 0x80],
+                [0x80, 0x80, 0x80],
+                [0xC0, 0x80, 0x80]
+            ]);
+        });
+
+        it('should correctly handle multiple data blocks', function () {
+            // This data is from a memory dump.  It should contain two VQ (0xE-type) blocks and then an 0x9 (end-frame).
+            var data = buf_swap32(parseHex('bc010b0b e0c5fb45 01010420 203fffff ffffffc0 00240000 00000000 00000000 0a142850' + '00000000 00000000'));
+            console.log('VQ multiple block data:');
+            console.log(fmt_u8a(data));
+            dec.decode(data);
+            
+            // TODO: improve asserts/etc. beyond just 'finished without error'
+        });
+        
+    });
+
+    describe('Full JPEG subsampled MCU example 0', function () {
+        // Corresponds to whole-mcu-example / main_mcu_test_2()
+        var data = parseHex('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');
+
+        
+        it('should decode properly', function () {
+            // DOES NOT APPEAR TO correspond to my notes in 'whole-mcu-example.txt'.
+            
+            dec._blitCallback = function (x, y, width, height, buf) {
+                console.log({x:x, y:y, width:width, height:height, buf:buf});
+                console.log(fmt_rgb_buf(width, buf));
+            };
+
+            dec.decode(data);
+
+        });
+        
+    });
+    
+    describe('Full JPEG subsampled MCU example 1', function () {
+
+        /* TODO: this looks VERRRRRY SIMILAR to the above example */
+        
+        var data = parseHex('040701a61bff6280f81fbaa2ff4dbc408dfccf405c15ff1f004800f500000000000000002dd4a462237ced2c9c25dca4cef7e6667d6626f3308063c3c7a1b7335badc24aaf0b5e9daf69590fcb96206b59e6f2ccb2bdd386b17dbb72182080d6288a2a1f2f0608a0fe87ae287f132f1023ff33d057c5ff470012403d0000000000000000ec1fb06cdacd2bdf9d79f3cde7f9f1362b7ce914ba521c79524a5bdc212a5ed47c3cbc6c7e072ae3e3c18384785f6ca6d4e22fb1af0c96449d1847a9c7037e966fa3ac8d4990830339463d277f25fc6f30ffe5f4f5cfec9f4ffff8bf00a0f5d358a2ab6e4e6778d929f686bd58ca9c26b8f7338f15105065dd39c718');
+
+        /*
+        it('should load quant tables and set subsamplingMode', function () {
+            dec.decode(data);
+
+            expect(dec._loadedQuantTables[0]).to.equal(4);
+            expect(dec._loadedQuantTables[1]).to.equal(7);
+            expect(dec.subsamplingMode).to.equal(422);
+        });
+         */
+        
+        it('should decode properly', function () {
+            // DOES NOT APPEAR TO correspond to my notes in 'whole-mcu-example.txt'.
+            
+            dec._blitCallback = function (x, y, width, height, buf) {
+                console.log({x:x, y:y, width:width, height:height, buf:buf});
+                console.log(fmt_rgb_buf(width, buf));
+            };
+
+            dec.decode(data);
+
+        });
+    });
+
+    // TODO: On the 'full-frame decode' and 'frame udpate decode' tests, we are NOT actually asserting anything about the code's output yet.
+    /*
+    describe('Full frame decode test', function () {
+
+        it('should decode properly', function () {
+
+            throw "Won't work without jQuery (or some other way of loading data).";
+            
+            dec._blitCallback = function (x, y, width, height, buf) {
+                if (x == 0 && y == 0) {
+                    console.log({x:x, y:y, width:width, height:height, buf:buf});
+                    console.log(fmt_rgb_buf(width, buf));
+                }
+            };
+
+            // TODO: This path won't work for other people, and the test case needs to be made to understand that this
+            // is async; plus, I had to manually add jQuery to the generated HTML.
+            $.get("/novnc-tests/tests/frame4.hex", function (data) {
+                data = parseHex(data);
+                dec.decode(data);
+            });
+        });
+    });
+     */
+
+    describe('Frame update decode test', function () {
+
+        it('should decode properly', function () {
+            var data = parseHex('050501a69a3f6080008aa2a8000000900000000000000000');
+            console.log(data);
+
+            // this data should NOT be solid-white!
+
+            dec._blitCallback = function (x, y, width, height, buf) {
+                console.log({x:x, y:y, width:width, height:height, buf:buf});
+                console.log(fmt_rgb_buf(width, buf));
+            };
+
+            dec.decode(data);
+        });
+    });
+    
+});
diff --git a/tests/test.rfb.js b/tests/test.rfb.js
index 3e8a1640..68fe54ec 100644
--- a/tests/test.rfb.js
+++ b/tests/test.rfb.js
@@ -759,8 +759,17 @@ describe('Remote Frame Buffer Protocol Client', function() {
                 client._rfb_init_state = 'Security';
             });
 
-            function send_security(type, cl) {
-                cl._sock._websocket._receive_data(new Uint8Array([1, type]));
+            // N.B.(kelleyk): 'types' may be either a single number or an array of numbers.
+            function send_security(types, cl) {
+                if (types.constructor !== Array)
+                    types = [types];
+                
+                var data = new Uint8Array(1 + types.length);
+                data[0] = types.length;
+                for (var i = 0; i < types.length; ++i)
+                    data[i+1] = types[i];
+                
+                cl._sock._websocket._receive_data(data);
             }
 
             it('should fail on auth scheme 0 (pre 3.7) with the given message', function () {
@@ -906,7 +915,13 @@ describe('Remote Frame Buffer Protocol Client', function() {
                     client._sock._websocket._open();
                     client._rfb_init_state = 'Security';
                     client._rfb_version = 3.8;
-                    send_security(16, client);
+                    // N.B.(kelleyk): Actual TightVNC servers support more than
+                    // just 16 ("tight"), whereas ATEN iKVM servers advertise only
+                    // 16.  This is a large part of how we detect that we are
+                    // speaking to an iKVM server, so if we want to test the
+                    // client's interaction with a TightVNC server, we need to
+                    // send more than just the one.
+                    send_security([1, 16], client);
                     client._sock._websocket._get_sent_data();  // skip the security reply
                 });
 
@@ -995,6 +1010,8 @@ describe('Remote Frame Buffer Protocol Client', function() {
                     client._sock._websocket._open();
                     client._rfb_init_state = 'Security';
                     client._rfb_version = 3.8;
+                    // N.B.(kelleyk): ATEN iKVM server advertise *only* 16 ("tight"),
+                    // which is how we detect them.
                     send_security(16, client);
                     client._sock._websocket._get_sent_data();  // skip the security reply
                     client._rfb_password = 'test1:test2';
@@ -1018,6 +1035,17 @@ describe('Remote Frame Buffer Protocol Client', function() {
                     expect(client._rfb_atenikvm).to.be.true;
                     expect(client._sock).to.have.sent(auth);
                 });
+
+                it('via new style method', function () {
+                    client._sock._websocket._receive_data(new Uint8Array([
+                        0,    0,    0,    0,    0,    0,    0,    0,
+                        0,    0,    0,    0,    0,    0,    0,    0,
+                        0,    0,    0,    0,    0,    0,    0,    0,
+                        0,    0,    0,    0,    0,    0,    0,    0]));
+                    expect(client._rfb_tightvnc).to.be.false;
+                    expect(client._rfb_atenikvm).to.be.true;
+                    expect(client._sock).to.have.sent(auth);
+                });
             });
         });
 
diff --git a/vnc_auto.html b/vnc_auto.html
index ca158e10..cfabbe09 100644
--- a/vnc_auto.html
+++ b/vnc_auto.html
@@ -81,7 +81,9 @@
         WebUtil.load_scripts({
             'core': ["base64.js", "websock.js", "des.js", "input/keysymdef.js",
                      "input/xtscancodes.js", "input/util.js", "input/devices.js",
-                     "display.js", "inflator.js", "rfb.js", "input/keysym.js"]});
+                     "ast2100/ast2100.js", "ast2100/ast2100idct.js", "ast2100/ast2100util.js", "ast2100/ast2100const.js",
+                     "display.js", "inflator.js", "rfb.js", "input/keysym.js"],
+            'app': [WebUtil.getLanguageFileLocation(), "webutil.js"]});
 
         var rfb;
         var resizeTimeout;