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Size of compressed file

 
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# 1  
Old 07-17-2015
Size of compressed file
Hi All,

Is there is any way to find the size of compressed file without doing decompression. The size should give the original uncompressed data size

Thanks
Arun
# 2  
Old 07-17-2015
Code:
gunzip -l file.gz

will help you.
# 3  
Old 07-21-2015
Depending on the tool used for compression, the above may do it, but you may also need to consider:-
Code:
zcat file.Z | wc


Robin
# 4  
Old 07-21-2015
Hi.

The utility p7zip can deal with many forms of compression:
Code:
 List of supported formats:
   - Packing / unpacking: 7z, ZIP, GZIP, BZIP2, XZ and TAR
   - Unpacking only: APM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT,
     HFS, ISO, LZH, LZMA, LZMA2, MBR, MSI, MSLZ, NSIS, NTFS, RAR (only
     if non-free p7zip-rar package is installed), RPM, SquashFS, UDF,
     VHD, WIM, XAR and Z.

For example:
Code:
$ file t1.zip 
t1.zip: Zip archive data, at least v2.0 to extract

running 7z on this file with "list" directive produces:
Code:
$ 7z l t1.zip 

7-Zip  4.58 beta  Copyright (c) 1999-2008 Igor Pavlov  2008-05-05
p7zip Version 4.58 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

Listing archive: t1.zip


   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
2010-06-07 09:23:38 .....          160          126  t1.sas7bdat
------------------- ----- ------------ ------------  ------------------------
                                   160          126  1 files, 0 folders

More recent versions, around 9.x, are available in repositories (e.g Debian, SuSE, CentOS, Mac OS X ("brew"), etc).

I don't know if every compression format includes meta-data that can be extracted without uncompressing the file, but p7zip seems worth a try.

The run was in the environment:
Code:
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian 5.0.8 (lenny, workstation)

Best wishes ... cheers, drl
 
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