gunzip module and buffer managment

[Valentin V. Bartenev]

On Friday 07 June 2013 01:57:54 kpstein wrote:
> I'm trying to use the http_gunzip  module as an example for a filter I am
> trying to write.  I'm particularly interested in the buffer management.
> 
> The module has a value in its ctx stuct called last_buf
> 
> ...
> ngx_chain_t  **last_out;
> ...
> 
> last_out is set in various places throughout the code.  Sometimes to other
> chains in the ctx, sometimes to newly allocated chains.
> 
> But as far as I can tell, none of the code ever uses the value stored in
> last_out.  (It seems to be a write-only variable :-)
> 
> Anybody know what I'm missing?
> 

% grep '*ctx->last_out' -n src/http/modules/ngx_http_gunzip_filter_module.c
461:        *ctx->last_out = cl;
497:        *ctx->last_out = cl;
546:        *ctx->last_out = cl;
592:    *ctx->last_out = cl;


  wbr, Valentin V. Bartenev

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