25260964598

Committed 02 May 2026 08:19PM UTC coverage: 99.438% (-0.3%) from 99.712%

Build # 25260964598

Build Type

push

github

Committed by

puzrin

Commit Message

Improve BMP handling

Coverage Stats

691 of 696 branches covered (99.28%)

17 of 20 new or added lines in 2 files covered. (85.0%)

1 existing line in 1 file now uncovered.

1061 of 1067 relevant lines covered (99.44%)

996.13 hits per line

Source File
Press 'n' to go to next uncovered line, 'b' for previous

91.3

/lib/parse_stream/bmp.js

'use strict';


var ParserStream = require('../common').ParserStream;
var str2arr      = require('../common').str2arr;
var sliceEq      = require('../common').sliceEq;


var SIG_BM = str2arr('BM');


module.exports = function () {
  var parser = new ParserStream();

  parser._bytes(26, function (data) {
    parser._skipBytes(Infinity);

    if (!sliceEq(data, 0, SIG_BM)) {
      parser.push(null);
      return;
    }

    var w, h;
    var headerSize = data.readUInt32LE(14);

    if (headerSize === 12) {
      // BMP v2 header
      w = data.readInt16LE(18);
      h = data.readInt16LE(20);
    } else if (headerSize > 12) {
      // BMP v3+ header
      w = data.readInt32LE(18);
      h = data.readInt32LE(22);
    } else {
      parser.push(null);
      return;
    }

    parser.push({
      width:  w,
      // Height can be negative to indicate a top-down bitmap
      height: Math.abs(h),
      type: 'bmp',
      mime: 'image/bmp',
      wUnits: 'px',
      hUnits: 'px'
    });

    parser.push(null);
  });

  return parser;
};

1	'use strict';
2
3
4	var ParserStream = require('../common').ParserStream;	3✔
5	var str2arr = require('../common').str2arr;	3✔
6	var sliceEq = require('../common').sliceEq;	3✔
7
8
9	var SIG_BM = str2arr('BM');	3✔
10
11
12	module.exports = function () {	3✔
13	var parser = new ParserStream();	336✔
14
15	parser._bytes(26, function (data) {	336✔
16	parser._skipBytes(Infinity);	282✔
17
18	if (!sliceEq(data, 0, SIG_BM)) {	282✔
19	parser.push(null);	276✔
20	return;	276✔
21	}
22
23	var w, h;
24	var headerSize = data.readUInt32LE(14);	6✔
25
26	if (headerSize === 12) {	6✔
27	// BMP v2 header
28	w = data.readInt16LE(18);	3✔
29	h = data.readInt16LE(20);	3✔
30	} else if (headerSize > 12) {	3!
31	// BMP v3+ header
32	w = data.readInt32LE(18);	3✔
33	h = data.readInt32LE(22);	3✔
34	} else {
NEW 35	parser.push(null);	×
NEW 36	return;	×
37	}
38
39	parser.push({	6✔
40	width: w,
41	// Height can be negative to indicate a top-down bitmap
42	height: Math.abs(h),
43	type: 'bmp',
44	mime: 'image/bmp',
45	wUnits: 'px',
46	hUnits: 'px'
47	});
48
49	parser.push(null);	6✔
50	});
51
52	return parser;	336✔
53	};

nodeca / probe-image-size / 25260964598

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