Convert file to byte array in reverse order

Question

byte[] bFile = new byte[(int) file.length()];

FileInputStream fileInputStream = new FileInputStream(file);
fileInputStream.read(bFile);
fileInputStream.close();

This code let's me convert file to byte array, am looking for reading file from end to start (in reverse order)

Edit : i dont wan't to read entire file. A part at the end (Example around 1000 bytes)

Why don't you just use the data in the byte array in reverse order? Since it's in an array you're free to do as you please with it. — nanofarad
– nanofarad, Commented Jun 1, 2016 at 21:18
Ah... See, that's important information. What you are asking is if there is some way to read the data at the end only and not the beginning also? — Rabbit Guy
– Rabbit Guy, Commented Jun 1, 2016 at 21:20
reading whole file and reversing the byte array will take soo much memory , may even throw out of memory exception. I need to perform this task for many files — Saiteja Prasadam
– Saiteja Prasadam, Commented Jun 1, 2016 at 21:21
@blahfunk exactly, sorry for incomplete question.. I need a read a part of file at the end (may be around 1000 byte) — Saiteja Prasadam
– Saiteja Prasadam, Commented Jun 1, 2016 at 21:23

Saiteja Prasadam · Accepted Answer · 2016-06-01 21:53:24Z

3

File file = new File(/*file path*/);
byte[] bFile = new byte[1000];

RandomAccessFile fileInputStream = new RandomAccessFile(file, "r");
fileInputStream.seek(fileInputStream.length() - bFile[0].length);
fileInputStream.read(bFile, 0, bFile.length);
fileInputStream.close();

I just figured it out, reading last 1000 bytes of a file

answered Jun 1, 2016 at 21:53

Saiteja Prasadam

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