51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
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/**
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* DataURI to ArrayBuffer
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* @param {*} dataURI
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*/
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export function dataURIToArrayBuffer(dataURI) {
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// 'data:image/jpeg;dataURI,...' => 'image/jpeg'
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// contentType = contentType || dataURI.match(/^data:([^;]+);base64,/mi)[1] || ''
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dataURI = dataURI.replace(/^data:([^;]+);base64,/gim, '').replace(/\s/g, '')
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const binary = atob(dataURI)
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const len = binary.length
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const buffer = new ArrayBuffer(len)
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const view = new Uint8Array(buffer)
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for (let i = 0; i < len; i++) {
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view[i] = binary.charCodeAt(i)
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}
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return buffer
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}
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/**
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* Base64 to Blob
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* @param {String} dataURI
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*/
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export function dataURItoBlob(dataURI) {
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// convert base64/URLEncoded data component to raw binary data held in a string
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let byteString
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if (dataURI.split(',')[0].indexOf('base64') >= 0) {
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byteString = atob(dataURI.split(',')[1])
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} else {
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byteString = unescape(dataURI.split(',')[1])
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}
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// separate out the mime component
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const mimeString = dataURI
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.split(',')[0]
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.split(':')[1]
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.split(';')[0]
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// write the bytes of the string to a typed array
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const ia = new Uint8Array(byteString.length)
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for (let i = 0; i < byteString.length; i++) {
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ia[i] = byteString.charCodeAt(i)
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}
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return new Blob([ia.buffer], {type: mimeString})
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}
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