Re: [Vala] How to use the ZLib bindings?

[JM <interflug1 gmx net>]

Hi Philipp

I tested your patch and it works very fine for me.
I also attached a deflate example based on the code of your inflate
example to this mail. The example takes a dummyfile.txt file and outputs
in gzip file format.
It is compiled with 
valac --pkg gio-2.0 --pkg zlib -X -lz zlibtest_deflate.vala 

Maybe somebody with a gnome git account can merge the patch into vala
repository?

Regards
Jörn 



Am Sonntag, den 04.10.2009, 14:25 +0200 schrieb Philipp Zabel:
> Hi,
>
> Does anybody have example code that uses the ZLib bindings? I tried to
> implement the example described at http://zlib.net/zlib_how.html for
> inflation, but compilation failed with errors from gcc about STATUS_OK
> etc. symbols not being found. The following patch helped with that for
> some reason.
>
> Also, I don't understand how Vala can handle memory for the next_in and
> next_out pointers when the inflate call is changing those pointers under
> its nose. Wouldn't it be more realistic not to wrap them as an array?
>
> I attached test code that works with this VAPI change (to be compiled
> with -X -lz). Any way to make it work without it? 
>
> thanks
> Philipp
>
> diff --git a/vapi/zlib.vapi b/vapi/zlib.vapi
> index b615f6f..14cc973 100644
> --- a/vapi/zlib.vapi
> +++ b/vapi/zlib.vapi
> @@ -49,16 +49,24 @@ namespace ZLib {
>               public const int BLOCK;
>       }
>  
> -     [CCode (cprefix = "Z_")]
>       namespace Status {
> +             [CCode (cname = "Z_OK")]
>               public const int OK;
> +             [CCode (cname = "Z_STREAM_END")]
>               public const int STREAM_END;
> +             [CCode (cname = "Z_NEED_DICT")]
>               public const int NEED_DICT;
> +             [CCode (cname = "Z_ERRNO")]
>               public const int ERRNO;
> +             [CCode (cname = "Z_STREAM_ERROR")]
>               public const int STREAM_ERROR;
> +             [CCode (cname = "Z_DATA_ERROR")]
>               public const int DATA_ERROR;
> +             [CCode (cname = "Z_MEM_ERROR")]
>               public const int MEM_ERROR;
> +             [CCode (cname = "Z_BUF_ERROR")]
>               public const int BUF_ERROR;
> +             [CCode (cname = "Z_VERSION_ERROR")]
>               public const int VERSION_ERROR;
>       }
>  
> @@ -98,12 +106,12 @@ namespace ZLib {
>  
>       [CCode (cname = "z_stream", destroy_function = "deflateEnd")]
>       public struct Stream {
> -             [CCode (array_length_cname = "avail_in", array_length_type = "guint")]
> -             public uchar[] next_in;
> +             public uchar* next_in;
> +             public uint avail_in;
>               public ulong total_in;
>  
> -             [CCode (array_length_cname = "avail_out", array_length_type = "guint")]
> -             public uchar[] next_out;
> +             public uchar* next_out;
> +             public uint avail_out;
>               public ulong total_out;
>  
>               public string? msg;
>
> _______________________________________________
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