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Editorial Team
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Asked: 2026-05-25T00:25:35+00:00

I am downloading some file Audio/Video/PDF from amazon S3 server. What I am doing

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I am downloading some file Audio/Video/PDF from amazon S3 server. What I am doing is at the start of download encrypt the only first 256kb for each file.
Recently I add resume functionality. What I want to do is to wait for complete downloading of file. One completed then I will encrypt the frist 256kb of file.

I want to encrypt first 256kb of file without creating a new file for that. As if I create a new then after 256kb I have to copy the other bytes to new file. This will take time as file size can be 200MB to 500MB.

What is the best solution for that?
I am using JDK1.6 Downloading is via input/output stream. 

import java.io.InputStream;
import java.io.FileOutputStream;
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1 Answer

  1. Editorial Team

    You might want to use RandomAccessFile. Read your 250K, encrypt on memory, overwrite in the same file.

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