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
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94.44

/lib/parse_sync/bmp.js

'use strict';

/* eslint-disable consistent-return */

var str2arr      = require('../common').str2arr;
var sliceEq      = require('../common').sliceEq;
var readInt16LE = require('../common').readInt16LE;
var readInt32LE = require('../common').readInt32LE;
var readUInt32LE = require('../common').readUInt32LE;

var SIG_BM = str2arr('BM');


module.exports = function (data) {
  if (data.length < 26) return;

  if (!sliceEq(data, 0, SIG_BM)) return;

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

  if (headerSize === 12) {
    // BMP v2 header
    w = readInt16LE(data, 18);
    h = readInt16LE(data, 20);
  } else if (headerSize > 12) {
    // BMP v3+ header
    w = readInt32LE(data, 18);
    h = readInt32LE(data, 22);
  } else {
    // BPM v1 and other garbage (10 bytes usually)
    return;
  }

  return {
    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'
  };
};

1	'use strict';
2
3	/* eslint-disable consistent-return */
4
5	var str2arr = require('../common').str2arr;	3✔
6	var sliceEq = require('../common').sliceEq;	3✔
7	var readInt16LE = require('../common').readInt16LE;	3✔
8	var readInt32LE = require('../common').readInt32LE;	3✔
9	var readUInt32LE = require('../common').readUInt32LE;	3✔
10
11	var SIG_BM = str2arr('BM');	3✔
12
13
14	module.exports = function (data) {	3✔
15	if (data.length < 26) return;	204✔
16
17	if (!sliceEq(data, 0, SIG_BM)) return;	156✔
18
19	var h;
20	var w;
21	var headerSize = readUInt32LE(data, 14);	6✔
22
23	if (headerSize === 12) {	6✔
24	// BMP v2 header
25	w = readInt16LE(data, 18);	3✔
26	h = readInt16LE(data, 20);	3✔
27	} else if (headerSize > 12) {	3!
28	// BMP v3+ header
29	w = readInt32LE(data, 18);	3✔
30	h = readInt32LE(data, 22);	3✔
31	} else {
32	// BPM v1 and other garbage (10 bytes usually)
NEW 33	return;	×
34	}
35
36	return {	6✔
37	width: w,
38	// Height can be negative to indicate a top-down bitmap
39	height: Math.abs(h),
40	type: 'bmp',
41	mime: 'image/bmp',
42	wUnits: 'px',
43	hUnits: 'px'
44	};
45	};

nodeca / probe-image-size / 25260964598

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