michael@0: /*
michael@0:  * Test for APNG encoding in libpr0n
michael@0:  *
michael@0:  */
michael@0: 
michael@0: 
michael@0: const Ci = Components.interfaces;
michael@0: const Cc = Components.classes;
michael@0: 
michael@0:   // dispose=[none|background|previous]
michael@0:   // blend=[source|over]
michael@0: 
michael@0: var apng1A = {
michael@0: 	// A 3x3 image with 3 frames, alternating red, green, blue. RGB format.
michael@0: 	width  : 3, height : 3, skipFirstFrame : false,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGB,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGB, stride : 9,
michael@0: 			transparency : null,
michael@0: 
michael@0: 			pixels : [
michael@0: 				255,0,0,  255,0,0,  255,0,0,
michael@0: 				255,0,0,  255,0,0,  255,0,0,
michael@0: 				255,0,0,  255,0,0,  255,0,0
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGB, stride : 9,
michael@0: 			transparency : null,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,255,0,  0,255,0,  0,255,0,
michael@0: 				0,255,0,  0,255,0,  0,255,0,
michael@0: 				0,255,0,  0,255,0,  0,255,0
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGB, stride : 9,
michael@0: 			transparency : null,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,255,  0,0,255,  0,0,255,
michael@0: 				0,0,255,  0,0,255,  0,0,255,
michael@0: 				0,0,255,  0,0,255,  0,0,255
michael@0: 				]
michael@0: 		}
michael@0: 
michael@0: 		],
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAIAAADZSiLoAAAACGFjVEwAAAADAAAAAM7tusAAAAAaZmNUTAAAAAAAAAADAAAAAwAAAAAAAAAAAfQD6AAAdRYgGAAAABBJREFUCJlj+M/AAEEMWFgAj44I+H2CySsAAAAaZmNUTAAAAAEAAAADAAAAAwAAAAAAAAAAAfQD6AAA7mXKzAAAABNmZEFUAAAAAgiZY2D4zwBFWFgAhpcI+I731VcAAAAaZmNUTAAAAAMAAAADAAAAAwAAAAAAAAAAAfQD6AAAA/MZJQAAABNmZEFUAAAABAiZY2Bg+A9DmCwAfaAI+AGmQVoAAAAASUVORK5CYII="
michael@0: };
michael@0: 
michael@0: 
michael@0: var apng1B = {
michael@0: 	// A 3x3 image with 3 frames, alternating red, green, blue. RGBA format.
michael@0: 	width  : 3, height : 3, skipFirstFrame : false,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGBA,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255,
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255,
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255
michael@0: 				]
michael@0: 		}
michael@0: 
michael@0: 		],
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAACGFjVEwAAAADAAAAAM7tusAAAAAaZmNUTAAAAAAAAAADAAAAAwAAAAAAAAAAAfQD6AAAdRYgGAAAABFJREFUCJlj+M/A8B+GGXByAF3XEe/CoiJ1AAAAGmZjVEwAAAABAAAAAwAAAAMAAAAAAAAAAAH0A+gAAO5lyswAAAASZmRBVAAAAAIImWNg+I8EcXIAVOAR77Vyl9QAAAAaZmNUTAAAAAMAAAADAAAAAwAAAAAAAAAAAfQD6AAAA/MZJQAAABRmZEFUAAAABAiZY2Bg+P8fgXFxAEvpEe8rClxSAAAAAElFTkSuQmCC"
michael@0: };
michael@0: 
michael@0: 
michael@0: var apng1C = {
michael@0: 	// A 3x3 image with 3 frames, alternating red, green, blue. RGBA format.
michael@0: 	// The first frame is skipped, so it will only flash green/blue (or static red in an APNG-unaware viewer)
michael@0: 	width  : 3, height : 3, skipFirstFrame : true,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGBA,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255,
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255,
michael@0: 				0,255,0,255,  0,255,0,255,  0,255,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255
michael@0: 				]
michael@0: 		}
michael@0: 
michael@0: 		],
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAACGFjVEwAAAACAAAAAPONk3AAAAARSURBVAiZY/jPwPAfhhlwcgBd1xHvwqIidQAAABpmY1RMAAAAAAAAAAMAAAADAAAAAAAAAAAB9APoAAB1FiAYAAAAEmZkQVQAAAABCJljYPiPBHFyAFTgEe+kD/2tAAAAGmZjVEwAAAACAAAAAwAAAAMAAAAAAAAAAAH0A+gAAJiA8/EAAAAUZmRBVAAAAAMImWNgYPj/H4FxcQBL6RHvC5ggGQAAAABJRU5ErkJggg=="
michael@0: };
michael@0: 
michael@0: 
michael@0: var apng2A = {
michael@0: 	// A 3x3 image with 3 frames, alternating red, green, blue. RGBA format.
michael@0: 	// blend = over mode
michael@0:     // (The green frame is a horizontal gradient, and the blue frame is a
michael@0:     // vertical gradient. They stack as they animate.)
michael@0: 	width  : 3, height : 3, skipFirstFrame : false,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGBA,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "over", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75,
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75,
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "over", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,255,75,   0,0,255,75,   0,0,255,75,
michael@0: 				0,0,255,180,  0,0,255,180,  0,0,255,180,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255
michael@0: 				]
michael@0: 		}
michael@0: 
michael@0: 		],
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAACGFjVEwAAAADAAAAAM7tusAAAAAaZmNUTAAAAAAAAAADAAAAAwAAAAAAAAAAAfQD6AAAdRYgGAAAABFJREFUCJlj+M/A8B+GGXByAF3XEe/CoiJ1AAAAGmZjVEwAAAABAAAAAwAAAAMAAAAAAAAAAAH0A+gAAZli+loAAAAcZmRBVAAAAAIImWNg+M/wn+E/wxaG/wzeDDg5ACeGDvKVa3pyAAAAGmZjVEwAAAADAAAAAwAAAAMAAAAAAAAAAAH0A+gAAXT0KbMAAAAcZmRBVAAAAAQImWNgYPjvjcAM/7cgMMP//zAMAPqkDvLn1m3SAAAAAElFTkSuQmCC"
michael@0: };
michael@0: 
michael@0: 
michael@0: var apng2B = {
michael@0: 	// A 3x3 image with 3 frames, alternating red, green, blue. RGBA format.
michael@0: 	// blend = over, dispose = background
michael@0:     // (The green frame is a horizontal gradient, and the blue frame is a
michael@0:     // vertical gradient. Each frame is displayed individually, blended to
michael@0:     // whatever the background is.)
michael@0: 	width  : 3, height : 3, skipFirstFrame : false,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGBA,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "background",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255,
michael@0: 				255,0,0,255,  255,0,0,255,  255,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "background",   blend : "over", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75,
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75,
michael@0: 				0,255,0,255,  0,255,0,180,  0,255,0,75
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "background",   blend : "over", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,255,75,   0,0,255,75,   0,0,255,75,
michael@0: 				0,0,255,180,  0,0,255,180,  0,0,255,180,
michael@0: 				0,0,255,255,  0,0,255,255,  0,0,255,255
michael@0: 				]
michael@0: 		}
michael@0: 
michael@0: 		],
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAACGFjVEwAAAADAAAAAM7tusAAAAAaZmNUTAAAAAAAAAADAAAAAwAAAAAAAAAAAfQD6AEAbA0RWQAAABFJREFUCJlj+M/A8B+GGXByAF3XEe/CoiJ1AAAAGmZjVEwAAAABAAAAAwAAAAMAAAAAAAAAAAH0A+gBAYB5yxsAAAAcZmRBVAAAAAIImWNg+M/wn+E/wxaG/wzeDDg5ACeGDvKVa3pyAAAAGmZjVEwAAAADAAAAAwAAAAMAAAAAAAAAAAH0A+gBAW3vGPIAAAAcZmRBVAAAAAQImWNgYPjvjcAM/7cgMMP//zAMAPqkDvLn1m3SAAAAAElFTkSuQmCC"
michael@0: };
michael@0: 
michael@0: 
michael@0: var apng3 = {
michael@0: 	// A 3x3 image with 4 frames. First frame is white, then 1x1 frames draw a diagonal line
michael@0: 	width  : 3, height : 3, skipFirstFrame : false,
michael@0: 	format : Ci.imgIEncoder.INPUT_FORMAT_RGBA,
michael@0: 	transparency : null,
michael@0: 	plays : 0,
michael@0: 
michael@0: 	frames  : [
michael@0: 		{ // frame #1
michael@0: 			width  : 3,    height : 3,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 
michael@0: 				255,255,255,255,  255,255,255,255,  255,255,255,255,
michael@0: 				255,255,255,255,  255,255,255,255,  255,255,255,255,
michael@0: 				255,255,255,255,  255,255,255,255,  255,255,255,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #2
michael@0: 			width  : 1,    height : 1,
michael@0: 			x_offset : 0,  y_offset : 0,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #3
michael@0: 			width  : 1,    height : 1,
michael@0: 			x_offset : 1,  y_offset : 1,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,0,255
michael@0: 				]
michael@0: 		},
michael@0: 
michael@0: 		{ // frame #4
michael@0: 			width  : 1,    height : 1,
michael@0: 			x_offset : 2,  y_offset : 2,
michael@0: 			dispose : "none",   blend : "source", delay : 500,
michael@0: 
michael@0: 			format : Ci.imgIEncoder.INPUT_FORMAT_RGBA, stride : 12,
michael@0: 
michael@0: 			pixels : [
michael@0: 				0,0,0,255
michael@0: 				]
michael@0: 		}
michael@0: 		],
michael@0: 
michael@0: 	expected : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAMAAAADCAYAAABWKLW/AAAACGFjVEwAAAAEAAAAAHzNZtAAAAAaZmNUTAAAAAAAAAADAAAAAwAAAAAAAAAAAfQD6AAAdRYgGAAAAA5JREFUCJlj+I8EGHByALuHI91kueRqAAAAGmZjVEwAAAABAAAAAQAAAAEAAAAAAAAAAAH0A+gAADJXfawAAAARZmRBVAAAAAIImWNgYGD4DwABBAEAbr5mpgAAABpmY1RMAAAAAwAAAAEAAAABAAAAAQAAAAEB9APoAAC4OHoxAAAAEWZkQVQAAAAECJljYGBg+A8AAQQBAJZ8LRAAAAAaZmNUTAAAAAUAAAABAAAAAQAAAAIAAAACAfQD6AAA/fh01wAAABFmZEFUAAAABgiZY2BgYPgPAAEEAQB3Eum9AAAAAElFTkSuQmCC"
michael@0: };
michael@0: 
michael@0: // Main test entry point.
michael@0: function run_test() {
michael@0: 	dump("Checking apng1A...\n");
michael@0: 	run_test_for(apng1A);
michael@0: 	dump("Checking apng1B...\n");
michael@0: 	run_test_for(apng1B);
michael@0: 	dump("Checking apng1C...\n");
michael@0: 	run_test_for(apng1C);
michael@0: 
michael@0: 	dump("Checking apng2A...\n");
michael@0: 	run_test_for(apng2A);
michael@0: 	dump("Checking apng2B...\n");
michael@0: 	run_test_for(apng2B);
michael@0: 
michael@0: 	dump("Checking apng3...\n");
michael@0: 	run_test_for(apng3);
michael@0: }; 
michael@0: 
michael@0: 
michael@0: function run_test_for(input) {
michael@0: 	var encoder, dataURL;
michael@0: 
michael@0: 	encoder = encodeImage(input);
michael@0: 	dataURL = makeDataURL(encoder, "image/png");
michael@0: 	do_check_eq(dataURL, input.expected);
michael@0: };
michael@0: 
michael@0: 
michael@0: function encodeImage(input) {
michael@0: 	var encoder = Cc["@mozilla.org/image/encoder;2?type=image/png"].createInstance();
michael@0: 	encoder.QueryInterface(Ci.imgIEncoder);
michael@0: 
michael@0: 	var options = "";
michael@0: 	if (input.transparency) { options += "transparency=" + input.transparency; }
michael@0: 	options += ";frames=" + input.frames.length;
michael@0: 	options += ";skipfirstframe=" + (input.skipFirstFrame ? "yes" : "no");
michael@0: 	options += ";plays=" + input.plays;
michael@0: 	encoder.startImageEncode(input.width, input.height, input.format, options);
michael@0: 
michael@0: 	for (var i = 0; i < input.frames.length; i++) {
michael@0: 		var frame = input.frames[i];
michael@0: 
michael@0: 		options = "";
michael@0: 		if (frame.transparency) { options += "transparency=" + input.transparency; }
michael@0: 		options += ";delay=" + frame.delay;
michael@0: 		options += ";dispose=" + frame.dispose;
michael@0: 		options += ";blend="   + frame.blend;
michael@0: 		if (frame.x_offset > 0) { options += ";xoffset=" + frame.x_offset; }
michael@0: 		if (frame.y_offset > 0) { options += ";yoffset=" + frame.y_offset; }
michael@0: 
michael@0: 		encoder.addImageFrame(frame.pixels, frame.pixels.length,
michael@0: 			frame.width, frame.height, frame.stride, frame.format, options);
michael@0: 	}
michael@0: 
michael@0: 	encoder.endImageEncode();
michael@0: 
michael@0: 	return encoder;
michael@0: }
michael@0: 
michael@0: 
michael@0: function makeDataURL(encoder, mimetype) {
michael@0: 	var rawStream = encoder.QueryInterface(Ci.nsIInputStream);
michael@0: 
michael@0: 	var stream = Cc["@mozilla.org/binaryinputstream;1"].createInstance();
michael@0: 	stream.QueryInterface(Ci.nsIBinaryInputStream);
michael@0: 
michael@0: 	stream.setInputStream(rawStream);
michael@0: 
michael@0: 	var bytes = stream.readByteArray(stream.available()); // returns int[]
michael@0: 
michael@0: 	var base64String = toBase64(bytes);
michael@0: 
michael@0: 	return "data:" + mimetype + ";base64," + base64String;
michael@0: }
michael@0: 
michael@0: /* toBase64 copied from extensions/xml-rpc/src/nsXmlRpcClient.js */
michael@0: 
michael@0: /* Convert data (an array of integers) to a Base64 string. */
michael@0: const toBase64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' +
michael@0:     '0123456789+/';
michael@0: const base64Pad = '=';
michael@0: function toBase64(data) {
michael@0:     var result = '';
michael@0:     var length = data.length;
michael@0:     var i;
michael@0:     // Convert every three bytes to 4 ascii characters.
michael@0:     for (i = 0; i < (length - 2); i += 3) {
michael@0:         result += toBase64Table[data[i] >> 2];
michael@0:         result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
michael@0:         result += toBase64Table[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)];
michael@0:         result += toBase64Table[data[i+2] & 0x3f];
michael@0:     }
michael@0: 
michael@0:     // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
michael@0:     if (length%3) {
michael@0:         i = length - (length%3);
michael@0:         result += toBase64Table[data[i] >> 2];
michael@0:         if ((length%3) == 2) {
michael@0:             result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
michael@0:             result += toBase64Table[(data[i+1] & 0x0f) << 2];
michael@0:             result += base64Pad;
michael@0:         } else {
michael@0:             result += toBase64Table[(data[i] & 0x03) << 4];
michael@0:             result += base64Pad + base64Pad;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return result;
michael@0: }