source: trip-planner-front/node_modules/buffer-indexof/index.js@ 76712b2

Last change on this file since 76712b2 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.5 KB
Line 
1module.exports = function bufferIndexOf(buff, search, offset, encoding){
2 if (!Buffer.isBuffer(buff)) {
3 throw TypeError('buffer is not a buffer');
4 }
5
6 // allow optional offset when providing an encoding
7 if (encoding === undefined && typeof offset === 'string') {
8 encoding = offset;
9 offset = undefined;
10 }
11
12 if (typeof search === 'string') {
13 search = new Buffer(search, encoding || 'utf8');
14 } else if (typeof search === 'number' && !isNaN(search)) {
15 search = new Buffer([search])
16 } else if (!Buffer.isBuffer(search)) {
17 throw TypeError('search is not a bufferable object');
18 }
19
20 if (search.length === 0) {
21 return -1;
22 }
23
24 if (offset === undefined || (typeof offset === 'number' && isNaN(offset))) {
25 offset = 0;
26 } else if (typeof offset !== 'number') {
27 throw TypeError('offset is not a number');
28 }
29
30 if (offset < 0) {
31 offset = buff.length + offset
32 }
33
34 if (offset < 0) {
35 offset = 0;
36 }
37
38 var m = 0;
39 var s = -1;
40
41 for (var i = offset; i < buff.length ; ++i) {
42 if(buff[i] != search[m]){
43 s = -1;
44 // <-- go back
45 // match abc to aabc
46 // 'aabc'
47 // 'aab'
48 // ^ no match
49 // a'abc'
50 // ^ set index here now and look at these again.
51 // 'abc' yay!
52 i -= m-1
53 m = 0;
54 }
55
56 if(buff[i] == search[m]) {
57 if(s == -1) {
58 s = i;
59 }
60 ++m;
61 if(m == search.length) {
62 break;
63 }
64 }
65 }
66
67 if (s > -1 && buff.length - s < search.length) {
68 return -1;
69 }
70 return s;
71}
72
73
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