用C自撸apache简易模块，搭建图片处理服务器。

写C是个撸sir

/* 
**  mod_acthumb.c -- Apache sample acthumb module
**  [Autogenerated via ``apxs -n acthumb -g'']
**
**  To play with this sample module first compile it into a
**  DSO file and install it into Apache's modules directory 
**  by running:
**
**    $ apxs -c -i mod_acthumb.c
**
**  Then activate it in Apache's httpd.conf file for instance
**  for the URL /acthumb in as follows:
**
**    #   httpd.conf
**    LoadModule acthumb_module modules/mod_acthumb.so
**    <Location /acthumb>
**    SetHandler acthumb
**    </Location>
**
**  Then after restarting Apache via
**
**    $ apachectl restart
**
**  you immediately can request the URL /acthumb and watch for the
**  output of this module. This can be achieved for instance via:
**
**    $ lynx -mime_header http://localhost/acthumb 
**
**  The output should be similar to the following one:
**
**    HTTP/1.1 200 OK
**    Date: Tue, 31 Mar 1998 14:42:22 GMT
**    Server: Apache/1.3.4 (Unix)
**    Connection: close
**    Content-Type: text/html
**  
**    The sample page from mod_acthumb.c
*/ 
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "wand/MagickWand.h"
/* The sample content handler */
static int acthumb_handler(request_rec *r)
{
    if (strcmp(r->handler, "application/acjpg")) {
        return DECLINED;
    }
    r->content_type = "image/jpeg";      
    if (!r->header_only){
		char src[300];
	   	char dest[300];
		char generatepic[300];
		memset(dest, '', sizeof(dest));
		strcpy(src,r->filename);		//1.jpg.acjpg
		strncpy(dest, src, strlen(src)-6);	//.acjpg six letters 1.jpg
		char *widths = strtok(r->args,"@"); 	//800
		char *heights = strtok(NULL,"@");	//700
		int width=atoi(widths);
		int height = atoi(heights);
		if((width==50 && height==50) || (width==100 && height==100) || (width==300 && height==300) || (width==500 && height==500) || (width==640 && height==640) || (width==640 && height > 200)){

		  	strncpy(generatepic, dest, strlen(src)-10);	//10 .jpg.acjpg fetch 1
			char *fileprefix = strtok(dest,".");
			char *filesuffix = strtok(NULL,".");

			char *POSFILETYPE[]={"jpg","png","gif","jpeg"};
		 	int i;	
			int hasfiletype=0;
			for( i = 0; i < 4; i=i+1){
				if(strcmp(POSFILETYPE[i],filesuffix)==0){
					hasfiletype = 1;
				}
			}

			if(hasfiletype==0){
				r->status=HTTP_NOT_FOUND;
				ap_send_error_response(r, 0);
			}
		
			strcat(generatepic,"_");
			strcat(generatepic,widths);
			strcat(generatepic,"_");
			strcat(generatepic,heights);
			strcat(generatepic,".");
			strcat(generatepic,filesuffix);
			strcat(dest,".");
			strcat(dest,filesuffix);


			if((access(generatepic,F_OK))==-1){   
				MagickBooleanType status;
			  	MagickWand *magick_wand;
				MagickWandGenesis();
				magick_wand=NewMagickWand();
				status=MagickReadImage(magick_wand,dest);
			 	//while (MagickNextImage(magick_wand) != MagickFalse)
			    		MagickResizeImage(magick_wand,width,height,LanczosFilter,1);
		
		
				status=MagickWriteImages(magick_wand,generatepic,MagickTrue);

				magick_wand=DestroyMagickWand(magick_wand);
			 	MagickWandTerminus();		
			} 

			apr_file_t      *file;
			apr_size_t      sent;
			apr_finfo_t file_info;
			apr_status_t    rc;

			apr_stat(&file_info, generatepic, APR_FINFO_MIN, r->pool);
		
			rc = apr_file_open(&file, generatepic, APR_READ, APR_OS_DEFAULT,
			                    r->pool);

		
		
			if (rc == APR_SUCCESS) {
			    ap_send_fd(file, r, 0, (apr_size_t)file_info.size, &sent);
			    apr_file_close(file);
			}
			else {
			  ap_rputs(generatepic,r);
			}
		}else{
			r->status=HTTP_NOT_FOUND;
				ap_send_error_response(r, 0);	
		}
    }
    return OK;
}

static void acthumb_register_hooks(apr_pool_t *p)
{
    ap_hook_handler(acthumb_handler, NULL, NULL, APR_HOOK_MIDDLE);
}

/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA acthumb_module = {
    STANDARD20_MODULE_STUFF, 
    NULL,                  /* create per-dir    config structures */
    NULL,                  /* merge  per-dir    config structures */
    NULL,                  /* create per-server config structures */
    NULL,                  /* merge  per-server config structures */
    NULL,                  /* table of config file commands       */
    acthumb_register_hooks  /* register hooks                      */
};