liquidliang
69233ddb7a
feat(utils): 添加数组、字符串、异步工具函数和测试 feat(utils): 实现日志、编码和类型工具模块 fix(web): 修复Service Worker缓存策略和CSP头 ci: 添加bundle大小检查工作流 build: 添加size-limit依赖和配置 perf(web): 优化vite分包策略
41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
/**
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* Encoding Utilities
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*
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* Pure functions for data encoding/decoding and format conversions.
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* All functions are framework-agnostic with zero external dependencies.
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*/
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/**
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* Convert base64 data URL to Blob
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*
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* Extracts the MIME type and binary data from a base64 data URL and creates a Blob.
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*
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* @param base64 - Base64 data URL string (e.g., "data:image/png;base64,iVBORw0KG...")
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* @returns Blob with the correct MIME type extracted from the data URL
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* @throws Error if the data URL format is invalid
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*
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* @example
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* ```typescript
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* const dataUrl = 'data:image/png;base64,iVBORw0KGgoAAAANS...';
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* const blob = base64ToBlob(dataUrl);
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*
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* // Use the blob for file downloads, uploads, etc.
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* const url = URL.createObjectURL(blob);
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* ```
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*/
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export function base64ToBlob(base64: string): Blob {
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const arr = base64.split(',');
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const fileType = arr[0].match(/:(.*?);/)![1];
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const bstr = atob(arr[1]);
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let l = bstr.length;
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const u8Arr = new Uint8Array(l);
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while (l--) {
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u8Arr[l] = bstr.charCodeAt(l);
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}
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return new Blob([u8Arr], {
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type: fileType,
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});
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}
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