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Questions - fileapi

Is it possible to re-open a file that was selected via the "input file" button programatically

In my web app the user selects a large zip file via an "input file" button. The file is then returned as a blob (see the snapshot zipfile1). The program then reads chunks (individual files) ...
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Avner Moshkovitz

javascript

fileapi

Votes: 0

Answers: 0

In Javascript, when opening a file via an "input file" button, is the entire file read into memory

In javascript, when opening a file via a button returns a Blob object (e.g. blob1). I can then get the actual data of the blob via blob1ArrayBuffer = blob1.arrayBuffer(); When the Blob object (e.g. b...
test-img

Avner Moshkovitz

javascript

fileapi

Votes: 0

Answers: 1

Latest Answer

No, all the file isn't read in memory (you can try to open a file of a few TB, that should still work). However note that the OS will still need to read some of that file to produce the metadata of th...
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Kaiido

Calculate file checksum in JS using ReadableStream and PipeTo?

I wish to calculate a file's checksum locally with JS and have been searching for examples of how to accomplish this using the Streams Api and pipeTo, but have only found examples with Node.js which I...
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Andreas Zita

javascript

checksum

cryptojs

fileapi

streams-api

Votes: 0

Answers: 1

Latest Answer

function byteArrayToWordArray(ba) { let wa = [], i; for (i = 0; i < ba.length; i++) wa[(i / 4) | 0] |= ba[i] << (24 - 8 * i); return CryptoJS.lib.WordArray.create(wa, ba.length); ...
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Andreas Zita

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