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| 1 | +<!DOCTYPE html> |
| 2 | +<html> |
| 3 | +<head> |
| 4 | + <title>OPFS Worker Image Demo</title> |
| 5 | +</head> |
| 6 | +<body> |
| 7 | + <button onclick="handleImageSave()">Save Image to OPFS</button> |
| 8 | + <button onclick="handleImageLoad()">Load Image from OPFS</button> |
| 9 | + <div id="image-container"></div> |
| 10 | + |
| 11 | + <script> |
| 12 | + const worker = new Worker('worker.js'); |
| 13 | + const FILE_ID = 'stored-image'; |
| 14 | + let currentExtension = ''; |
| 15 | + |
| 16 | + worker.onmessage = (e) => { |
| 17 | + const { action } = e.data; |
| 18 | + switch (action) { |
| 19 | + case 'encoded': |
| 20 | + console.log('File saved to OPFS:', e.data); |
| 21 | + break; |
| 22 | + case 'decoded': |
| 23 | + handleDecodedImage(e.data); |
| 24 | + break; |
| 25 | + case 'error': |
| 26 | + console.error('Worker error:', e.data); |
| 27 | + break; |
| 28 | + } |
| 29 | + }; |
| 30 | + |
| 31 | + async function handleImageSave() { |
| 32 | + try { |
| 33 | + const [fileHandle] = await window.showOpenFilePicker({ |
| 34 | + types: [{ |
| 35 | + description: 'Images', |
| 36 | + accept: {'image/*': ['.png', '.jpg', '.jpeg', '.gif']} |
| 37 | + }] |
| 38 | + }); |
| 39 | + |
| 40 | + const file = await fileHandle.getFile(); |
| 41 | + currentExtension = file.name.split('.').pop(); |
| 42 | + const buffer = await file.arrayBuffer(); |
| 43 | + |
| 44 | + worker.postMessage({ |
| 45 | + action: 'encode', |
| 46 | + id: FILE_ID, |
| 47 | + data: new Uint8Array(buffer), |
| 48 | + extension: currentExtension |
| 49 | + }, [buffer]); |
| 50 | + |
| 51 | + } catch (error) { |
| 52 | + if (error.name !== 'AbortError') { |
| 53 | + console.error('File selection error:', error); |
| 54 | + } |
| 55 | + } |
| 56 | + } |
| 57 | + |
| 58 | + function handleImageLoad() { |
| 59 | + worker.postMessage({ |
| 60 | + action: 'decode', |
| 61 | + id: FILE_ID, |
| 62 | + extension: currentExtension |
| 63 | + }); |
| 64 | + } |
| 65 | + |
| 66 | + function handleDecodedImage({ data, extension }) { |
| 67 | + const container = document.getElementById('image-container'); |
| 68 | + container.innerHTML = ''; |
| 69 | + |
| 70 | + const blob = new Blob([data], { type: getMimeType(extension) }); |
| 71 | + const url = URL.createObjectURL(blob); |
| 72 | + |
| 73 | + const img = new Image(); |
| 74 | + img.src = url; |
| 75 | + img.alt = 'OPFS Image'; |
| 76 | + img.style.maxWidth = '100%'; |
| 77 | + |
| 78 | + img.onload = () => URL.revokeObjectURL(url); |
| 79 | + container.appendChild(img); |
| 80 | + } |
| 81 | + |
| 82 | + function getMimeType(extension) { |
| 83 | + return { |
| 84 | + 'png': 'image/png', |
| 85 | + 'jpg': 'image/jpeg', |
| 86 | + 'jpeg': 'image/jpeg', |
| 87 | + 'gif': 'image/gif' |
| 88 | + }[extension.toLowerCase()] || 'application/octet-stream'; |
| 89 | + } |
| 90 | + </script> |
| 91 | +</body> |
| 92 | +</html> |
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