How to write a existing bigger binary file into small/compact binary file in C.

[cancerion]

I have a binary file of size 3GB. I want to reduce the size using some coding in C to write another binary file. Please suggest/provide a way to write compact binary file. TO read this file i need to use C#. Thanks, Sachin

[ghle]

WinZip(3GB_Filename, 2GB_Filename);

? :) Seriously, it depends on what is contained in the 3GB binary file. Is it even compressible? If it contains lots of NULLS, for example, change the NULL bytes to a single NULL followed by a count of how many there are. A string of 10 NULLS would turn into a single NULL and a byte with the number 10 in it, saving 8 bytes. Reading the file in, you would simply reverse the process. 1,2,3,4,5,0,0,0,0,0,0,0,0,0,0,1,2,3,a,b,c,0,0,0,0,d,e,0,f,ff (30 bytes) Becomes 1,2,3,4,5,0,a,1,2,3,a,b,c,0,4,d,e,0,1,f,ff (21 bytes) Alternatively, implement one of the Open Source Zip and Unzip routines in your C and C# code, as appropriate.

Gary

[GAJERA]

check this library. http://zlib.net/[^] use following function from library for compress binary file. deflateInit deflate deflateEnd

[Aescleal]

I've used (libbzip2[^]) in the past with some success at shrinking certain types of binary file. Hopefully there's some repetition in it or whatever you try isn't going to be able to do much to shrink it. Cheers, Ash

[rp_suman]

Hope below links will help you: fastest c++ file compression library available[^] Cabinet File (*.CAB) Compression and Extraction[^]

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