Hi, I need some help with InputStreamReader.read I'm trying to implement

Question

Hi, I need some help with InputStreamReader.read I'm trying to implement

a function that reads X lines from the end of a file. I'm doing that by reading chunks of 4096 bytes and dividing them to lines. When trying to read the last 4096 chars of the (60kb) file using isr.read(bytearr, filesize-4096, 4096); it gives me IndexOutOfBoundsException.
I tried reading from other points but only from 4000 and earlier it stops giving me this error. Any ideas? On Google I only saw people who actually went out of bounds. Nothing like this issue 😓

0

10.09.2021

5 ответов

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A. Belenky Автор вопроса

Nader Jafari
java.nio.file.Files.readAllLines() outputs a List<...

Wouldn't it be really inefficient? It's for an android app, so inefficiency translates to battery drain

0

10.09.2021

Nader Jafari

A. Belenky
Wouldn't it be really inefficient? It's for an and...

How big of a text file are you expecting?

0

10.09.2021

Nader Jafari

A. Belenky
Wouldn't it be really inefficient? It's for an and...

A little bit but not that much, yolo it

0

10.09.2021

Velan Chandrasekar

A. Belenky
Wouldn't it be really inefficient? It's for an and...

See if this works... divide the filesize by 4096 & the remainder will give you the last chunk size. Do the read for the entire file & inside the exception (IndexOutOfBoundsException), just execute the isr.read - only for that last chunk.

0

10.09.2021

Nader Jafari · Accepted Answer

Nader Jafari

java.nio.file.Files.readAllLines() outputs a List<String>. Iterate over it backwards. No chunk non-sense

0

10.09.2021

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Hi, I need some help with InputStreamReader.read I'm trying to implement

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