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| 1 <html> |
| 2 <head> |
| 3 <title>Blob Creation & Slicing</title> |
| 4 <script type="text/javascript" src="common.js"></script> |
| 5 <script type="text/javascript"> |
| 6 // We create < 3000 bytes of data, as that is the max for the browsertest. |
| 7 var MAX_BYTES = 3000; |
| 8 |
| 9 // Number of blobs constructed with raw data. |
| 10 var NUM_RAW_BLOBS = 100; |
| 11 // Number of blobs we create by slicing the raw data blobs. |
| 12 var NUM_SLICES = 100; |
| 13 // Number of blobs we create by sandwiching sliced blobs in between new data. |
| 14 var NUM_SANDWICHES = 100; |
| 15 var totalSize = 0; |
| 16 |
| 17 var generatePsuedoRandomUint8Array = function(length) { |
| 18 var array = new Uint8Array(length); |
| 19 for (let i = 0; i < length; ++i) { |
| 20 array[i] = (17 + 23 * i) & 0xFF; |
| 21 } |
| 22 return array; |
| 23 } |
| 24 |
| 25 var test = function() { |
| 26 var blobs = []; |
| 27 |
| 28 // This should cause us to go straight to file. |
| 29 var savedToDiskDataSize = 190; |
| 30 var savedToDiskData = generatePsuedoRandomUint8Array(savedToDiskDataSize); |
| 31 |
| 32 // This should require multiple shared memory segments. |
| 33 var sharedMemoryDataSize = 15; |
| 34 var sharedMemoryData = generatePsuedoRandomUint8Array(sharedMemoryDataSize); |
| 35 |
| 36 var sandwichDataSize = 7; |
| 37 |
| 38 // This should fit in IPC. |
| 39 var ipcDataSize = 2; |
| 40 var ipcData = generatePsuedoRandomUint8Array(ipcDataSize); |
| 41 |
| 42 var expectedBlobData = []; |
| 43 for (let i = 0; i < NUM_RAW_BLOBS; ++i) { |
| 44 let data = []; |
| 45 if (i % 5 == 0) { |
| 46 data.push(sharedMemoryData); |
| 47 } else if (i % 13 == 0) { |
| 48 data.push(savedToDiskData); |
| 49 } else { |
| 50 data.push(ipcData); |
| 51 } |
| 52 expectedBlobData.push(data[data.length - 1]); |
| 53 let blob = new Blob(data, { content_type: "text/plain" }); |
| 54 blobs.push(blob); |
| 55 totalSize += blob.size; |
| 56 } |
| 57 |
| 58 for (let i = 0; i < NUM_SLICES; ++i) { |
| 59 let origSize; |
| 60 let origData; |
| 61 let rawIndex = i % NUM_RAW_BLOBS; |
| 62 if (rawIndex % 5 == 0) { |
| 63 origSize = sharedMemoryDataSize; |
| 64 origData = sharedMemoryData; |
| 65 } else if (rawIndex % 13 == 0) { |
| 66 origSize = savedToDiskDataSize; |
| 67 origData = savedToDiskData; |
| 68 } else { |
| 69 origSize = ipcDataSize; |
| 70 origData = ipcData; |
| 71 } |
| 72 let blob; |
| 73 let expectedData; |
| 74 if (i % 2 == 0) { |
| 75 blob = blobs[i].slice(origSize / 2); |
| 76 expectedData = origData.slice(origSize / 2); |
| 77 } else { |
| 78 blob = blobs[i].slice(0, origSize / 2); |
| 79 expectedData = origData.slice(0, origSize / 2); |
| 80 } |
| 81 expectedBlobData.push(expectedData); |
| 82 blobs.push(blob); |
| 83 } |
| 84 |
| 85 var getBytes = function(string) { |
| 86 var bytes = []; |
| 87 for (let i = 0; i < string.length; ++i) { |
| 88 bytes.push(string.charCodeAt(i)); |
| 89 } |
| 90 return bytes; |
| 91 } |
| 92 |
| 93 for (let i = 0; i < NUM_SANDWICHES; ++i) { |
| 94 let sliceIndex = NUM_RAW_BLOBS + (i % NUM_SLICES); |
| 95 let slicedDataSize = expectedBlobData[sliceIndex].length; |
| 96 blobs.push(new Blob(['pre', blobs[sliceIndex], 'post'], { content_type: "tex
t/plain" })); |
| 97 totalSize += sandwichDataSize; |
| 98 |
| 99 let expectedData = new Uint8Array(sandwichDataSize + slicedDataSize); |
| 100 expectedData.set(getBytes("pre"), 0); |
| 101 expectedData.set(expectedBlobData[sliceIndex], 3); |
| 102 expectedData.set(getBytes("post"), 3 + slicedDataSize); |
| 103 expectedBlobData.push(expectedData); |
| 104 } |
| 105 shouldBeTrue("totalSize <= MAX_BYTES"); |
| 106 |
| 107 var numRead = 0; |
| 108 for (let i = 0; i < blobs.length; i++) { |
| 109 (function(index, d) { |
| 110 var reader = new FileReader(); |
| 111 reader.onloadend = function(e) { |
| 112 if (reader.error) { |
| 113 fail('Error when reading blob ' + index + ': ' + reader.error); |
| 114 return; |
| 115 } |
| 116 numRead++; |
| 117 debug('Finished reading blob ' + index); |
| 118 shouldBe('event.target.result.byteLength', d.length + ''); |
| 119 shouldBe('new Uint8Array(event.target.result)', |
| 120 '[' + d + ']'); |
| 121 if (numRead >= blobs.length) { |
| 122 done('Done!'); |
| 123 } |
| 124 } |
| 125 return reader; |
| 126 })(i, expectedBlobData[i]).readAsArrayBuffer(blobs[i]); |
| 127 } |
| 128 }; |
| 129 </script> |
| 130 </head> |
| 131 <body onLoad="test()"> |
| 132 <div id="status">Starting...<br/></div> |
| 133 </body> |
| 134 </html> |
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Chromium Code Reviews
Issue 2516713002:
[BlobStorage] Implementing disk. (Closed)
