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I would like to use gzip from C++ (or C) to gzip a string. If possible, I would like to use zlib.
When I learned that I would have to use zlib to compress and uncompress, I Googled it for a few minutes and then quickly wrote a program to gzip a file and then ungzip it. However, I don't actually have any need to do that. I need to use gzip to compress and uncompress a string, not a file. I couldn't find much good documentation for using gzip on strings. Every example I find works with files.
When I learned that I would have to use zlib to compress and uncompress, I Googled it for a few minutes and then quickly wrote a program to gzip a file and then ungzip it. However, I don't actually have any need to do that. I need to use gzip to compress and uncompress a string, not a file.
Well you could take your program and remove the file IO parts
Since gzopen()/gzwrite() work with files, I am not surprised that minigzip creates the same file headers as gzip. The issue is getting zlib calls to do it.
After posting the first message here yesterday, I did come across that link and read the relevant portion. According to that, I would have to use deflate/deflateInit2. If that is what I have to do, I must say that the proper settings of the parameters to deflateInit2() to produce a gzip type header are not well documented. Something about adding 16 to windowsBits. I would really like to see an explicit example of compressing and uncompressing using zlib programmed to duplicate gzip.