The tar file format is quite simple, a 512 bytes header followed by the file contents also padded to a 512 boundary (see Tar_(file_format)).

As you only have one file per archive...

  1. open the file with the corresponding :gzip layer
  2. read the header and extract the file size from there
  3. read lines taking care to remove the extra nulls from the last line on the file

In reply to Re: File list from gz file without reading everything into memory by salva
in thread File list from gz file without reading everything into memory by drblove27

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