Gzip Questions

[Hal Vaughan]

I'm reading in binary files that I want to compress with Gzip in Crypto++.  I found this example (http://www.codeproject.com/Articles/835/Compression-and-decompression-using-the-Crypto-lib), which is for an earlier version of Crypto++.

I've noticed there is no longer a Gzip.Close() function for zipping or unzipping.  Is there another way to signal that I'm done providing data to be compressed (or uncompressed)?

And my other question relates to the byte* array used to read in data.  I know I can cast char* to byte* without any problem, but other than iterating through every byte in an array, I don't see any way to create a const byte* array from data I've loaded in from a file.  The read statements all produce output in char* arrays.

I tried casting my char* to byte* and using Gzip.PutModifiable() to pass my data on for compression, but apparently I'm not getting actual compression that way.  (Unless it's somehow possible to DEFLATE a 16MB file to 10 bytes!)

Do I need to do something to indicate I'm done providing data to DEFLATE or INFLATE?

And does PutModifiable() work differently than Put()?  (I know it's not a Gzip issue, but I can't find a way to convert a char* array to a const byte* array and I have been searching.)

[Jeffrey Walton]

On Mar 12, 2:13 am, Hal Vaughan <tangoovers...@gmail.com> wrote:
> I'm reading in binary files that I want to compress with Gzip in Crypto++.
>  I found this example

> (http://www.codeproject.com/Articles/835/Compression-and-decompression...),

> which is for an earlier version of Crypto++.
>
> I've noticed there is no longer a Gzip.Close() function for zipping or
> unzipping.  Is there another way to signal that I'm done providing data to
> be compressed (or uncompressed)?

http://www.cryptopp.com/docs/ref/class_gzip.html

> I tried casting my char* to byte* and using Gzip.PutModifiable() to pass my
> data on for compression, but apparently I'm not getting actual compression
> that way.  (Unless it's somehow possible to DEFLATE a 16MB file to 10
> bytes!)

Call MessageEnd() when yo are finished putting data.

Jeff

[Hal Vaughan]

Okay.  Working fine now.  Thank you!

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