57 lines
1.4 KiB
Plaintext
57 lines
1.4 KiB
Plaintext
/**
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* @description: base64 to blob
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*/
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export function dataURLtoBlob(base64Buf: string): Blob {
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const arr = base64Buf.split(',');
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const typeItem = arr[0];
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const mime = typeItem.match(/:(.*?);/)![1];
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const bstr = atob(arr[1]);
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let n = bstr.length;
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const u8arr = new Uint8Array(n);
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while (n--) {
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u8arr[n] = bstr.charCodeAt(n);
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}
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return new Blob([u8arr], { type: mime });
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}
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/**
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* img url to base64
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* @param url
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*/
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export function urlToBase64(url: string, mineType?: string): Promise<string> {
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return new Promise((resolve, reject) => {
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let canvas = document.createElement('CANVAS') as Nullable<HTMLCanvasElement>;
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const ctx = canvas!.getContext('2d');
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const img = new Image();
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img.crossOrigin = '';
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img.onload = function () {
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if (!canvas || !ctx) {
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return reject();
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}
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canvas.height = img.height;
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canvas.width = img.width;
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ctx.drawImage(img, 0, 0);
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const dataURL = canvas.toDataURL(mineType || 'image/png');
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canvas = null;
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resolve(dataURL);
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};
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img.src = url;
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});
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}
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/**
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* base64 to file
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* @param dataURL
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*/
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export function base64ToFile(dataurl:any, filename:any) {
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let arr = dataurl.split(",");
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let mime = arr[0].match(/:(.*?);/)[1];
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let bstr = atob(arr[1]);
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let len = bstr.length;
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let u8arr = new Uint8Array(len);
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while (len--) {
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u8arr[len] = bstr.charCodeAt(len);
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}
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return new File([u8arr], filename, {type: mime});
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}
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