source: trip-planner-front/node_modules/minipass-fetch/lib/blob.js@ 1ad8e64

Last change on this file since 1ad8e64 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 2.3 KB
Line 
1'use strict'
2const Minipass = require('minipass')
3const TYPE = Symbol('type')
4const BUFFER = Symbol('buffer')
5
6class Blob {
7 constructor (blobParts, options) {
8 this[TYPE] = ''
9
10 const buffers = []
11 let size = 0
12
13 if (blobParts) {
14 const a = blobParts
15 const length = Number(a.length)
16 for (let i = 0; i < length; i++) {
17 const element = a[i]
18 const buffer = element instanceof Buffer ? element
19 : ArrayBuffer.isView(element)
20 ? Buffer.from(element.buffer, element.byteOffset, element.byteLength)
21 : element instanceof ArrayBuffer ? Buffer.from(element)
22 : element instanceof Blob ? element[BUFFER]
23 : typeof element === 'string' ? Buffer.from(element)
24 : Buffer.from(String(element))
25 size += buffer.length
26 buffers.push(buffer)
27 }
28 }
29
30 this[BUFFER] = Buffer.concat(buffers, size)
31
32 const type = options && options.type !== undefined
33 && String(options.type).toLowerCase()
34 if (type && !/[^\u0020-\u007E]/.test(type)) {
35 this[TYPE] = type
36 }
37 }
38
39 get size () {
40 return this[BUFFER].length
41 }
42
43 get type () {
44 return this[TYPE]
45 }
46
47 text () {
48 return Promise.resolve(this[BUFFER].toString())
49 }
50
51 arrayBuffer () {
52 const buf = this[BUFFER]
53 const off = buf.byteOffset
54 const len = buf.byteLength
55 const ab = buf.buffer.slice(off, off + len)
56 return Promise.resolve(ab)
57 }
58
59 stream () {
60 return new Minipass().end(this[BUFFER])
61 }
62
63 slice (start, end, type) {
64 const size = this.size
65 const relativeStart = start === undefined ? 0
66 : start < 0 ? Math.max(size + start, 0)
67 : Math.min(start, size)
68 const relativeEnd = end === undefined ? size
69 : end < 0 ? Math.max(size + end, 0)
70 : Math.min(end, size)
71 const span = Math.max(relativeEnd - relativeStart, 0)
72
73 const buffer = this[BUFFER]
74 const slicedBuffer = buffer.slice(
75 relativeStart,
76 relativeStart + span
77 )
78 const blob = new Blob([], { type })
79 blob[BUFFER] = slicedBuffer
80 return blob
81 }
82
83 get [Symbol.toStringTag] () {
84 return 'Blob'
85 }
86
87 static get BUFFER () {
88 return BUFFER
89 }
90}
91
92Object.defineProperties(Blob.prototype, {
93 size: { enumerable: true },
94 type: { enumerable: true },
95})
96
97module.exports = Blob
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