cgi the program on C ++, compressed HTTP. Help

This is a discussion on cgi the program on C ++, compressed HTTP. Help within the C++ Programming forums, part of the General Programming Boards category; Hi all! Who be created function for a compression of a content in cgi to the program written on C? ...

  1. #1
    Registered User
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    Jul 2005
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    4

    cgi the program on C ++, compressed HTTP. Help

    Hi all!

    Who be created function for a compression of a content in cgi to the program written on C?

    Share a simple example!

    Has written the for gzip and deflate but does not work: (
    Code:
    #include <stdio.h>
    #include <assert.h>
    
    /**/ 
    #include <zlib.h>
    
    static void *g_zalloc_wrapper(voidpf opaque, uInt items, uInt size) {
    	void *ptr = malloc(items * size);
    	return ptr;
    }
    
    static void g_zfree_wrapper(voidpf opaque, voidpf address) {
    	free(address);
    }
    
    
    /// gzip = 1 > gzip, gzip = 0 > deflate
    static int zlib_encode(Bytef *mg, int gzip)
    {
    static int gz_magic[2] = {0x1f, 0x8b}; 
    #define OS_CODE			0x03  /*FIXME */
    
    	z_stream stream;
        //char *new_body;
    
    	stream.next_in = mg;
    	stream.avail_in = strlen(mg);
    	
    	stream.total_in = 0;
    	
    	//new_body = 
    		stream.next_out = malloc(strlen(mg) + 75); /* overly generous */
    
        assert(stream.next_out);
    
    	
    
    	stream.avail_out = strlen(mg) + 64;
    	stream.total_out = 0;
    	
    	stream.zalloc = g_zalloc_wrapper;
    	stream.zfree = g_zfree_wrapper;
    	stream.opaque = NULL;
    	
    	stream.data_type = Z_ASCII;
    
    /* 
    */
    	if (deflateInit2(
    		    &stream, 
    		    3 /* compression level, 1-9, default 6 (Z_DEFAULT_COMPRESSION) */, 
    		    Z_DEFLATED, 
    		    ((gzip!=0)?16:0)+15 /* gzip headers? (16) + window size (15b) */, 
    		    3 /* memory level, 1-9, default 8 */, 
    		    Z_DEFAULT_STRATEGY
    		    ) != Z_OK) {
    		/* failed to initialize, bail out */
    	 	deflateEnd(&stream);
    		return -1;
    	}
    		 
    	while (stream.avail_in != 0) {
    		switch(deflate(&stream, Z_FINISH)) {
    		case Z_STREAM_END: /* success */
    			break;
    			
    		case Z_OK: /* need more buffer space !?  bail out... */
    			deflateEnd(&stream);
    			return -1;
    			
    		default: /* other error cases */
    			deflateEnd(&stream); 
    			return -1;
    		}
    	}
    	
    if(gzip!=0) 
    {
     	printf("Content-Encoding: gzip\n\r");	 
    }
    else
    {
    	printf("Content-Encoding: deflate\n\r"); 
    }
    
    printf("Content-type: text/html\n\r\n\r"); 
    
    int ifd = dup(fileno(stdout)); 
    FILE *Out = fdopen(ifd, "w+b");
    
    
    if(gzip!=0) {
    	char *s2[10];
    	        s2[0] = gz_magic[0];
    	        s2[1] = gz_magic[1];
    	        s2[2] = Z_DEFLATED;
    	        s2[3] = s2[4] = s2[5] = s2[6] = s2[7] = s2[8] = 0;  
    	        s2[9] = OS_CODE;
    
    			fwrite(&s2 , 10 , 1 ,Out);
    }
    
    fwrite(&stream.next_out , stream.total_out , 1 ,Out);
    
     
    
    if(gzip!=0) {
    	char *trailer[9];
    
    			uLong crc = crc32(0L, Z_NULL, 0);
    
    			crc = crc32(crc, (const Bytef *) mg, strlen(mg));
    
    			/* write crc & stream.total_in in LSB order */
    			trailer[0] = (char) crc & 0xFF;
    			trailer[1] = (char) (crc >> 8) & 0xFF;
    			trailer[2] = (char) (crc >> 16) & 0xFF;
    			trailer[3] = (char) (crc >> 24) & 0xFF;
    			trailer[4] = (char) stream.total_in & 0xFF;
    			trailer[5] = (char) (stream.total_in >> 8) & 0xFF;
    			trailer[6] = (char) (stream.total_in >> 16) & 0xFF;
    			trailer[7] = (char) (stream.total_in >> 24) & 0xFF;
    			trailer[8] = '\0';
    
    			fwrite(&trailer , 9 , 1 ,Out);
    }
    deflateEnd(&stream);
    }
    
    
     
    
    
    
    int main()
    {
    
    	
    zlib_encode ("<html>test</html>", 0);
     
    
    }

  2. #2
    aoeuhtns
    Join Date
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    581
    Shouldn't the HTTP server be handling compression?

  3. #3
    Registered User
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    Jul 2005
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    4
    Yes, a server can pack the is.

    But how to make it separately, in cgi to the program?

    In code PHP it is possible, but I cannot understand as?

  4. #4
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    People help!

  5. #5
    Registered User Jaqui's Avatar
    Join Date
    Feb 2005
    Posts
    416
    instead of including compression as a function of the cgi, call the compression as a shell app.

    have the script send what needs to be compressed to gzip / bzip2 / tar


    it's actually better to use mod_gzip, as not all clients can deal with the compressed content, and mod_gzip will only compress when it's not going to be a problem.

  6. #6
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    Jul 2005
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    4
    I do not wish to use external modules or appendices. I wish to realize it in own cgi to the program. In PHP is фукция ob_start ("ob_gzhandler"); and the content is compressed PHP, without appendices.

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