BMP Hex String Converter

bmp-hex-str-converter.js

/*
 * Source Image: https://pixeljoint.com/pixelart/34353.htm
 * 
 * How to source hexStr data:
 * - Download image.
 * - Resave as `input.bmp` in suitable bitmap editor (e.g. Aseprite) if necessary.
 * - Rename to `input.txt`.
 * - Open up & format with `([^ \n]{2})([^ \n]{2})( |\n)` -> `\1 \2 ` replacement regex.
 * - Trim off trailing space.
 * - Profit?!
 */
const hexStr = '42 4d 76 02 00 00 00 00 00 00 76 00 00 00 28 00 00 00 20 00 00 00 20 00 00 00 01 00 04 00 00 00 00 00 00 02 00 00 12 0b 00 00 12 0b 00 00 10 00 00 00 10 00 00 00 08 18 29 00 29 21 21 00 00 31 52 00 10 4a 5a 00 21 63 7b 00 42 39 39 00 63 5a 52 00 73 73 6b 00 18 73 9c 00 39 ad ce 00 8c 8c 84 00 d6 d6 c6 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 56 1a 76 7a 76 7a 76 76 66 66 67 7a a7 a7 66 77 65 1a 65 55 55 55 55 55 55 55 65 67 66 65 67 a7 75 17 51 11 51 11 11 11 11 11 51 76 55 66 67 aa 75 16 51 84 15 11 11 15 55 11 11 65 15 67 a6 77 65 17 51 98 21 51 11 51 11 51 11 55 11 76 6a 66 65 1a 51 12 83 15 55 13 32 15 11 11 11 66 67 65 75 17 51 11 34 21 11 38 43 15 11 11 11 56 76 66 a5 16 51 11 12 31 23 42 11 51 11 11 11 11 15 56 75 17 51 11 11 13 44 21 55 11 11 11 11 11 11 56 a5 16 51 11 11 24 98 35 55 11 11 11 11 11 55 67 a5 16 51 11 11 44 8b 92 65 51 11 11 11 11 56 76 75 16 51 11 14 82 39 94 56 55 11 11 11 11 11 15 75 16 51 11 38 25 52 48 25 75 51 11 11 11 11 56 65 16 51 11 49 11 56 52 55 67 55 11 11 11 11 15 65 16 51 11 24 11 15 76 66 56 a5 51 11 11 11 15 65 16 51 11 11 11 11 5a 76 75 6a 55 11 11 11 15 65 16 51 11 11 11 11 15 a7 67 66 a5 51 11 11 15 65 16 65 11 11 11 11 11 5b 76 a6 6b 55 11 11 15 65 17 51 11 11 11 11 11 15 b7 67 66 a5 51 11 15 65 17 67 65 11 11 11 11 11 5b 77 76 6b 55 11 15 65 1a 76 55 11 11 11 11 11 15 b7 7a 66 b5 51 15 65 1a 65 11 11 11 11 11 11 11 5b 77 a6 6b 55 15 75 17 65 51 11 11 11 11 11 11 15 b7 77 6a 75 55 65 1a 66 67 65 11 11 11 11 11 11 5b 66 66 b6 55 75 17 56 76 66 11 11 11 11 11 11 15 ba 77 aa 55 a5 16 66 a6 67 11 55 11 11 11 11 11 57 ba ab 55 75 16 77 6a 76 51 56 11 11 11 11 11 15 6a bb 55 65 17 aa 76 66 55 67 15 11 11 11 11 11 11 15 55 75 17 7a 76 56 66 76 56 55 55 55 55 55 55 55 56 a5 16 77 66 7a 7a a7 76 66 66 76 67 a7 67 a7 67 a5 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 15';

const bmp = new File(
	[
		new Uint8Array(
			hexStr.split(' ').map(
				x => parseInt(x, 16)
			)
		)
	],
	'output.bmp',
	{type: 'image/bmp'}
);

const a = document.createElement('a');
a.href = URL.createObjectURL(bmp);
a.download = bmp.name;
document.body.appendChild(a);

a.click();

document.body.removeChild(a);

URL.revokeObjectURL(bmp);