[PATCH] upload-progress-tracking

Hi, This is a patch that implements a hooking mechanism into the rfc1867_post_handler() function that process post content of type multipart/form-data, for example when uploading files. This will allow execution of a callback routine while php reads and process the incoming data. This happens before the actual script is loaded and executed. This will make possible for an extension to register a callback, that will do something interesting like an upload-progress-meter for the incoming uploads. This wishes to be a better approach to do U-P-M than my previous patch, that was inserting ugly code directly into rfc1867_post_handler() function. This new implementation provides separation of code, and a standard hooking mechanism, whatever you need to do. This patch define a new configuration option 'upload_progress_tracking' (default off). You will have to turn it ON, in order for U-P-M to work. This is intended to reduce the number of wasted cpu cycles when this feature is not needed. You should turn this on only for the directories/files that actually need and use this. Security considerations: data received from client is checked for valid characters and valid length before doing anything else with it. What can be done with this ? well... this was intended to be a way to do an upload progress meter, but you can do a lot of other things, even RUN PHP CODE while data is uploaded. I have a quick&dirt patch available if anyone want to play with ... See the attached README file for more technical details. BTW, patch is against php-4.3.4