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Просмотр файла: blob-util.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.blobUtil = {})));
}(this, (function (exports) { 'use strict';
// TODO: including these in blob-util.ts causes typedoc to generate docs for them,
// even with --excludePrivate ¯\_(ツ)_/¯
/** @private */
function loadImage(src, crossOrigin) {
return new Promise(function (resolve, reject) {
var img = new Image();
if (crossOrigin) {
img.crossOrigin = crossOrigin;
}
img.onload = function () {
resolve(img);
};
img.onerror = reject;
img.src = src;
});
}
/** @private */
function imgToCanvas(img) {
var canvas = document.createElement('canvas');
canvas.width = img.width;
canvas.height = img.height;
// copy the image contents to the canvas
var context = canvas.getContext('2d');
context.drawImage(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);
return canvas;
}
/* global Promise, Image, Blob, FileReader, atob, btoa,
BlobBuilder, MSBlobBuilder, MozBlobBuilder, WebKitBlobBuilder, webkitURL */
/**
* Shim for
* [`new Blob()`](https://developer.mozilla.org/en-US/docs/Web/API/Blob.Blob)
* to support
* [older browsers that use the deprecated `BlobBuilder` API](http://caniuse.com/blob).
*
* Example:
*
* ```js
* var myBlob = blobUtil.createBlob(['hello world'], {type: 'text/plain'});
* ```
*
* @param parts - content of the Blob
* @param properties - usually `{type: myContentType}`,
* you can also pass a string for the content type
* @returns Blob
*/
function createBlob(parts, properties) {
parts = parts || [];
properties = properties || {};
if (typeof properties === 'string') {
properties = { type: properties }; // infer content type
}
try {
return new Blob(parts, properties);
}
catch (e) {
if (e.name !== 'TypeError') {
throw e;
}
var Builder = typeof BlobBuilder !== 'undefined'
? BlobBuilder : typeof MSBlobBuilder !== 'undefined'
? MSBlobBuilder : typeof MozBlobBuilder !== 'undefined'
? MozBlobBuilder : WebKitBlobBuilder;
var builder = new Builder();
for (var i = 0; i < parts.length; i += 1) {
builder.append(parts[i]);
}
return builder.getBlob(properties.type);
}
}
/**
* Shim for
* [`URL.createObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* var myUrl = blobUtil.createObjectURL(blob);
* ```
*
* @param blob
* @returns url
*/
function createObjectURL(blob) {
return (typeof URL !== 'undefined' ? URL : webkitURL).createObjectURL(blob);
}
/**
* Shim for
* [`URL.revokeObjectURL()`](https://developer.mozilla.org/en-US/docs/Web/API/URL.revokeObjectURL)
* to support browsers that only have the prefixed
* `webkitURL` (e.g. Android <4.4).
*
* Example:
*
* ```js
* blobUtil.revokeObjectURL(myUrl);
* ```
*
* @param url
*/
function revokeObjectURL(url) {
return (typeof URL !== 'undefined' ? URL : webkitURL).revokeObjectURL(url);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBinaryString(blob).then(function (binaryString) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBinaryString(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
var hasBinaryString = typeof reader.readAsBinaryString === 'function';
reader.onloadend = function () {
var result = reader.result || '';
if (hasBinaryString) {
return resolve(result);
}
resolve(arrayBufferToBinaryString(result));
};
reader.onerror = reject;
if (hasBinaryString) {
reader.readAsBinaryString(blob);
}
else {
reader.readAsArrayBuffer(blob);
}
});
}
/**
* Convert a base64-encoded string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.base64StringToBlob(base64String);
* ```
* @param base64 - base64-encoded string
* @param type - the content type (optional)
* @returns Blob
*/
function base64StringToBlob(base64, type) {
var parts = [binaryStringToArrayBuffer(atob(base64))];
return type ? createBlob(parts, { type: type }) : createBlob(parts);
}
/**
* Convert a binary string to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.binaryStringToBlob(binaryString);
* ```
*
* @param binary - binary string
* @param type - the content type (optional)
* @returns Blob
*/
function binaryStringToBlob(binary, type) {
return base64StringToBlob(btoa(binary), type);
}
/**
* Convert a `Blob` to a binary string.
*
* Example:
*
* ```js
* blobUtil.blobToBase64String(blob).then(function (base64String) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the binary string
*/
function blobToBase64String(blob) {
return blobToBinaryString(blob).then(btoa);
}
/**
* Convert a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`)
* to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.dataURLToBlob(dataURL);
* ```
*
* @param dataURL - dataURL-encoded string
* @returns Blob
*/
function dataURLToBlob(dataURL) {
var type = dataURL.match(/data:([^;]+)/)[1];
var base64 = dataURL.replace(/^[^,]+,/, '');
var buff = binaryStringToArrayBuffer(atob(base64));
return createBlob([buff], { type: type });
}
/**
* Convert a `Blob` to a data URL string
* (e.g. `'data:image/png;base64,iVBORw0KG...'`).
*
* Example:
*
* ```js
* var dataURL = blobUtil.blobToDataURL(blob);
* ```
*
* @param blob
* @returns Promise that resolves with the data URL string
*/
function blobToDataURL(blob) {
return blobToBase64String(blob).then(function (base64String) {
return 'data:' + blob.type + ';base64,' + base64String;
});
}
/**
* Convert an image's `src` URL to a data URL by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToDataURL('http://mysite.com/img.png').then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToDataURL('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (dataURL) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the data URL string
*/
function imgSrcToDataURL(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvas.toDataURL(type, quality);
});
}
/**
* Convert a `canvas` to a `Blob`.
*
* Examples:
*
* ```js
* blobUtil.canvasToBlob(canvas).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* Most browsers support converting a canvas to both `'image/png'` and `'image/jpeg'`. You may
* also want to try `'image/webp'`, which will work in some browsers like Chrome (and in other browsers, will just fall back to `'image/png'`):
*
* ```js
* blobUtil.canvasToBlob(canvas, 'image/webp').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param canvas - HTMLCanvasElement
* @param type - the content type (optional, defaults to 'image/png')
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function canvasToBlob(canvas, type, quality) {
if (typeof canvas.toBlob === 'function') {
return new Promise(function (resolve) {
canvas.toBlob(resolve, type, quality);
});
}
return Promise.resolve(dataURLToBlob(canvas.toDataURL(type, quality)));
}
/**
* Convert an image's `src` URL to a `Blob` by loading the image and painting
* it to a `canvas`.
*
* Note: this will coerce the image to the desired content type, and it
* will only paint the first frame of an animated GIF.
*
* Examples:
*
* ```js
* blobUtil.imgSrcToBlob('http://mysite.com/img.png').then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* ```js
* blobUtil.imgSrcToBlob('http://some-other-site.com/img.jpg', 'image/jpeg',
* 'Anonymous', 1.0).then(function (blob) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param src - image src
* @param type - the content type (optional, defaults to 'image/png')
* @param crossOrigin - for CORS-enabled images, set this to
* 'Anonymous' to avoid "tainted canvas" errors
* @param quality - a number between 0 and 1 indicating image quality
* if the requested type is 'image/jpeg' or 'image/webp'
* @returns Promise that resolves with the `Blob`
*/
function imgSrcToBlob(src, type, crossOrigin, quality) {
type = type || 'image/png';
return loadImage(src, crossOrigin).then(imgToCanvas).then(function (canvas) {
return canvasToBlob(canvas, type, quality);
});
}
/**
* Convert an `ArrayBuffer` to a `Blob`.
*
* Example:
*
* ```js
* var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
* ```
*
* @param buffer
* @param type - the content type (optional)
* @returns Blob
*/
function arrayBufferToBlob(buffer, type) {
return createBlob([buffer], type);
}
/**
* Convert a `Blob` to an `ArrayBuffer`.
*
* Example:
*
* ```js
* blobUtil.blobToArrayBuffer(blob).then(function (arrayBuff) {
* // success
* }).catch(function (err) {
* // error
* });
* ```
*
* @param blob
* @returns Promise that resolves with the `ArrayBuffer`
*/
function blobToArrayBuffer(blob) {
return new Promise(function (resolve, reject) {
var reader = new FileReader();
reader.onloadend = function () {
var result = reader.result || new ArrayBuffer(0);
resolve(result);
};
reader.onerror = reject;
reader.readAsArrayBuffer(blob);
});
}
/**
* Convert an `ArrayBuffer` to a binary string.
*
* Example:
*
* ```js
* var myString = blobUtil.arrayBufferToBinaryString(arrayBuff)
* ```
*
* @param buffer - array buffer
* @returns binary string
*/
function arrayBufferToBinaryString(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
var length = bytes.byteLength;
var i = -1;
while (++i < length) {
binary += String.fromCharCode(bytes[i]);
}
return binary;
}
/**
* Convert a binary string to an `ArrayBuffer`.
*
* ```js
* var myBuffer = blobUtil.binaryStringToArrayBuffer(binaryString)
* ```
*
* @param binary - binary string
* @returns array buffer
*/
function binaryStringToArrayBuffer(binary) {
var length = binary.length;
var buf = new ArrayBuffer(length);
var arr = new Uint8Array(buf);
var i = -1;
while (++i < length) {
arr[i] = binary.charCodeAt(i);
}
return buf;
}
exports.createBlob = createBlob;
exports.createObjectURL = createObjectURL;
exports.revokeObjectURL = revokeObjectURL;
exports.blobToBinaryString = blobToBinaryString;
exports.base64StringToBlob = base64StringToBlob;
exports.binaryStringToBlob = binaryStringToBlob;
exports.blobToBase64String = blobToBase64String;
exports.dataURLToBlob = dataURLToBlob;
exports.blobToDataURL = blobToDataURL;
exports.imgSrcToDataURL = imgSrcToDataURL;
exports.canvasToBlob = canvasToBlob;
exports.imgSrcToBlob = imgSrcToBlob;
exports.arrayBufferToBlob = arrayBufferToBlob;
exports.blobToArrayBuffer = blobToArrayBuffer;
exports.arrayBufferToBinaryString = arrayBufferToBinaryString;
exports.binaryStringToArrayBuffer = binaryStringToArrayBuffer;
Object.defineProperty(exports, '__esModule', { value: true });
})));
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