root / HServer / 00.Server / 00.Program / node_modules / blob / index.js
이력 | 보기 | 이력해설 | 다운로드 (2.15 KB)
| 1 | 39 | HKM | /**
|
|---|---|---|---|
| 2 | * Create a blob builder even when vendor prefixes exist
|
||
| 3 | */
|
||
| 4 | |||
| 5 | var BlobBuilder = global.BlobBuilder
|
||
| 6 | || global.WebKitBlobBuilder |
||
| 7 | || global.MSBlobBuilder |
||
| 8 | || global.MozBlobBuilder; |
||
| 9 | |||
| 10 | /**
|
||
| 11 | * Check if Blob constructor is supported
|
||
| 12 | */
|
||
| 13 | |||
| 14 | var blobSupported = (function() { |
||
| 15 | try {
|
||
| 16 | var a = new Blob(['hi']); |
||
| 17 | return a.size === 2; |
||
| 18 | } catch(e) {
|
||
| 19 | return false; |
||
| 20 | } |
||
| 21 | })(); |
||
| 22 | |||
| 23 | /**
|
||
| 24 | * Check if Blob constructor supports ArrayBufferViews
|
||
| 25 | * Fails in Safari 6, so we need to map to ArrayBuffers there.
|
||
| 26 | */
|
||
| 27 | |||
| 28 | var blobSupportsArrayBufferView = blobSupported && (function() { |
||
| 29 | try {
|
||
| 30 | var b = new Blob([new Uint8Array([1,2])]); |
||
| 31 | return b.size === 2; |
||
| 32 | } catch(e) {
|
||
| 33 | return false; |
||
| 34 | } |
||
| 35 | })(); |
||
| 36 | |||
| 37 | /**
|
||
| 38 | * Check if BlobBuilder is supported
|
||
| 39 | */
|
||
| 40 | |||
| 41 | var blobBuilderSupported = BlobBuilder
|
||
| 42 | && BlobBuilder.prototype.append |
||
| 43 | && BlobBuilder.prototype.getBlob; |
||
| 44 | |||
| 45 | /**
|
||
| 46 | * Helper function that maps ArrayBufferViews to ArrayBuffers
|
||
| 47 | * Used by BlobBuilder constructor and old browsers that didn't
|
||
| 48 | * support it in the Blob constructor.
|
||
| 49 | */
|
||
| 50 | |||
| 51 | function mapArrayBufferViews(ary) { |
||
| 52 | for (var i = 0; i < ary.length; i++) { |
||
| 53 | var chunk = ary[i];
|
||
| 54 | if (chunk.buffer instanceof ArrayBuffer) { |
||
| 55 | var buf = chunk.buffer;
|
||
| 56 | |||
| 57 | // if this is a subarray, make a copy so we only
|
||
| 58 | // include the subarray region from the underlying buffer
|
||
| 59 | if (chunk.byteLength !== buf.byteLength) {
|
||
| 60 | var copy = new Uint8Array(chunk.byteLength); |
||
| 61 | copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength));
|
||
| 62 | buf = copy.buffer; |
||
| 63 | } |
||
| 64 | |||
| 65 | ary[i] = buf; |
||
| 66 | } |
||
| 67 | } |
||
| 68 | } |
||
| 69 | |||
| 70 | function BlobBuilderConstructor(ary, options) { |
||
| 71 | options = options || {};
|
||
| 72 | |||
| 73 | var bb = new BlobBuilder(); |
||
| 74 | mapArrayBufferViews(ary); |
||
| 75 | |||
| 76 | for (var i = 0; i < ary.length; i++) { |
||
| 77 | bb.append(ary[i]); |
||
| 78 | } |
||
| 79 | |||
| 80 | return (options.type) ? bb.getBlob(options.type) : bb.getBlob();
|
||
| 81 | }; |
||
| 82 | |||
| 83 | function BlobConstructor(ary, options) { |
||
| 84 | mapArrayBufferViews(ary); |
||
| 85 | return new Blob(ary, options || {}); |
||
| 86 | }; |
||
| 87 | |||
| 88 | module.exports = (function() {
|
||
| 89 | if (blobSupported) {
|
||
| 90 | return blobSupportsArrayBufferView ? global.Blob : BlobConstructor;
|
||
| 91 | } else if (blobBuilderSupported) { |
||
| 92 | return BlobBuilderConstructor;
|
||
| 93 | } else {
|
||
| 94 | return undefined; |
||
| 95 | } |
||
| 96 | })(); |