Fix a bug in the input handling. ap_http_filter() was modifying *readbytes
which corresponded to r->remaining (in ap_get_client_block). However, ap_get_client_block was *also* adjusting r->remaining. Net result was that PUT (and probably POST) was broken. (at least on large inputs) To fix it, I simply removed the indirection on "readbytes" for input filters. There is no reason for them to return data (the brigade length is the return length). This also simplifies a number of calls where people needed to do &zero just to pass zero. I also added a number of comments about operations and where things could be improved, or are (semi) broken. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89008 13f79535-47bb-0310-9956-ffa450edef68
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