tail a gzipped file in c++

Question

I have multiple huge gzipped text files. I have to read the first and last n lines without loading the whole file into memory using head and tail like functions. For plain text files I use a tail like function similar to this answer.

However I want to avoid unzipping the files first. I have implemented a head like function working on gzipped files using a technique similar to this answer. But I fail to implement a tail like function that works with gzipped files.

The answer you reference actually *is* uncompressing the file. It just does it transparently (by pusing the `zlib_decompressor()` filter). — Some programmer dude, Oct 25 '20 at 17:47
And what you want to accomplish isn't really possible without uncompressing the whole file. — Some programmer dude, Oct 25 '20 at 17:48

score 0 · Answer 1 · answered Oct 25 '20 at 19:49

0

Can't be done without running through the entire file and decompressing, at least in memory.

answered Oct 25 '20 at 19:49

Mark Adler

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This is a pity. – Jan Hajer Oct 26 '20 at 10:45

tail a gzipped file in c++

1 Answers1