Question

how can we compress and decompress file in c

Asked by: dpd3891

Please help me on this question of how we can compress and decompress file. Is there any inbuilt library functions in c language that will help to reduce coding. like in java when I searched for compression and decompression on google, I got java.util.zip.* package.

Thank you for your help.

dpd

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Asked On
2009-10-27 at 09:28:28ID24847824
Topics

C Programming Language

,

C++ Programming Language

Participating Experts
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Answers

 

by: evilrixPosted on 2009-10-27 at 09:36:59ID: 25674473

>> Is there any inbuilt library functions in c language that will help to reduce coding
No. If you just want to compress and decompress programatically take a look at zlib.
http://www.zlib.net/

 

by: jkrPosted on 2009-10-27 at 09:40:26ID: 25674525

Take a look at http://www.wischik.com/lu/programmer/zip_utils.html ("Zip Utils - clean, elegant, simple, C++/win32") - comes with full source code, is free and easy to handle.

 

by: dpd3891Posted on 2009-10-27 at 09:53:33ID: 25674672

I tried to use zlib.net and when execute the zpipe.c to understand the code by following steps from README file:
"To compile all files and run the test program, follow the instructions given at
the top of Makefile. In short "make test; make install" should work for most
machines. For Unix: "./configure; make test; make install". "

then when i try to ececute zpipe.c I received followinfg error.
cc zpipe.c -o zpipe
/tmp/ccpQaMME.o: In function `def':
/tmp/ccpQaMME.o(.text+0x2e): undefined reference to `deflateInit_'
/tmp/ccpQaMME.o(.text+0x8d): undefined reference to `deflateEnd'
/tmp/ccpQaMME.o(.text+0xec): undefined reference to `deflate'
/tmp/ccpQaMME.o(.text+0x16c): undefined reference to `deflateEnd'
/tmp/ccpQaMME.o(.text+0x1ee): undefined reference to `deflateEnd'
/tmp/ccpQaMME.o: In function `inf':
/tmp/ccpQaMME.o(.text+0x23f): undefined reference to `inflateInit_'
/tmp/ccpQaMME.o(.text+0x29d): undefined reference to `inflateEnd'
/tmp/ccpQaMME.o(.text+0x2ea): undefined reference to `inflate'
/tmp/ccpQaMME.o(.text+0x33f): undefined reference to `inflateEnd'
/tmp/ccpQaMME.o(.text+0x39c): undefined reference to `inflateEnd'
/tmp/ccpQaMME.o(.text+0x3d8): undefined reference to `inflateEnd'
collect2: ld returned 1 exit status

so am I doing something wrong while compiling?........I saved zpipe.c file in the folder of name include/ where zlib.h is present.

Thanks,
dpd

 

by: evilrixPosted on 2009-10-27 at 09:56:31ID: 25674704

You compile command "cc zpipe.c -o zpipe" isn't linking in the zlib library Try the following...

cc zpipe.c -lzlib -o zpipe

 

by: evilrixPosted on 2009-10-27 at 09:57:28ID: 25674719

Actually, it might just be this...

cc zpipe.c -lz -o zpipe

 

by: ikeworkPosted on 2009-10-27 at 10:41:48ID: 25675233

But why dont you just call configure/make/make install? It does all the compiling for you, doesnt it?

 

by: IbanUlovPosted on 2009-10-27 at 14:15:15ID: 25677611

I use bzip and it works very well.

http://www.bzip.org/

20120131-EE-VQP-002

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