24 lines
No EOL
851 B
JavaScript
24 lines
No EOL
851 B
JavaScript
if (typeof String.prototype.startsWith != 'function') {
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String.prototype.startsWith = function (str) {
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return this.slice(0, str.length) == str
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}
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}
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function dataURItoBlob(dataURI) {
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// convert base64 to raw binary data held in a string
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// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
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var byteString = atob(dataURI.split(',')[1]);
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// separate out the mime component
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var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
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// write the bytes of the string to an ArrayBuffer
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var ab = new ArrayBuffer(byteString.length);
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var ia = new Uint8Array(ab);
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for (var i = 0; i < byteString.length; i++) {
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ia[i] = byteString.charCodeAt(i);
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}
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// write the ArrayBuffer to a blob, and you're done
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return new Blob([ab], { type: mimeString });
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} |