20 lines
657 B
TypeScript
20 lines
657 B
TypeScript
export const useBlobUrlFromB64 = (dataurl: string): string => {
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// data:image/jpeg;base64,/9j/...
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const arr = dataurl.split(',')
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if (arr.length < 2) {
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throw new Error('dataurl is not a valid base64 image')
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}
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const mimeMatches = arr[0].match(/:(.*?);/)
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if (mimeMatches === null) {
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throw new Error('dataurl is not a valid base64 image')
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}
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const mime = mimeMatches[1] //image/png
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const b64data = atob(arr[1])
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let length = b64data.length
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const u8arr = new Uint8Array(length)
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while (length--) {
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u8arr[length] = b64data.charCodeAt(length)
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}
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const blob = new Blob([u8arr], {type: mime})
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return URL.createObjectURL(blob)
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} |