Php uses zlib to compress and decompress files (swf)

Before we use the zlip function, we need to perform the following operations, otherwise we will not be able to read it down.

First set in PHP. ini

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Zlib. output_compression = On Zlib. output_compression_level = 6

The first option is enable compression, and the second option is compression ratio. The optional range is 1-9;

Then enable deflate compression in apach to remove the well number.

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# LoadModule deflate_module modules/mod_deflate.so

So far, this still does not work. You also need to select a blank area in http. conf and add the output filter of the file type to select which suffixes to press.

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AddOutputFilterByType DEFLATE text/html text/plain text/xml application/x-httpd-php AddOutputFilter DEFLATE css js txt php xml html htm

If you do not have the permission to modify the php. Ini file, you can use the phpr ini_set function to perform operations.
For example

 

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<? Php Ini_set ("zlib. output_compression", "On "); ?> <? Php Ini_set ("zlib. output_compression", 4096 ); ?>

Okay, now everything is ready for us to import the final file.

Compress the swf file:

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<? Php // File name $ Filename = "test.swf "; // Open the file $ Rs = fopen ($ filename, "r "); // Read the file data $ Str = fread ($ rs, filesize ($ filename )); // Set the swf header file $ Head = substr ($ str, 1, 8 ); $ Head = "C". $ head; // Obtain the swf file content $ Body = substr ($ str, 8 ); // Compress the file content with a maximum compression level of 9 $ Body = gzcompress ($ body, 9 ); // Merge the file header and content $ Str = $ head. $ body; // Close the read File Stream Fclose ($ rs ); // Create a new file $ Ws = fopen ("create.swf", "w "); // Write an object Fwrite ($ ws, $ str ); // Close File retention Fclose ($ ws ); ?> Decompress the flash swf file   // File name $ Filename = "test.swf "; // Open the file $ Rs = fopen ($ filename, "r "); // Read the file data $ Str = fread ($ rs, filesize ($ filename )); // Set the swf header file $ Head = substr ($ str, 1, 8 ); $ Head = "F". $ head; // Obtain the swf file content $ Body = substr ($ str, 8 ); // Decompress the file content $ Body = gzuncompress ($ body ); // Merge the file header and content $ Str = $ head. $ body; // Close the read File Stream Fclose ($ rs ); // Create a new file $ Ws = fopen ("create.swf", "w "); // Write an object Fwrite ($ ws, $ str ); // Close File retention Fclose ($ ws ); ?>

Note: The gzip data header is larger than the zlib data header because it stores file names and other file system information. In fact, this is a widely used gzip file

Data header format. Note that the zlib library itself cannot create a gzip file, but it is quite easy to write compressed data to a gzip file.

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