From: b <b@05ce6ebb-7522-4a6e-a768-0026ae12be9f>
Date: Mon, 29 Aug 2016 20:11:07 +0000 (+0000)
Subject: Support for 206 Partial content.
X-Git-Url: http://bicyclesonthemoon.info/git-projects/?a=commitdiff_plain;h=HEAD;p=yplom%2Fproxy

Support for 206 Partial content.



git-svn-id: svn://botcastle1b/yplom/proxy@19 05ce6ebb-7522-4a6e-a768-0026ae12be9f
---

diff --git a/proxy.1.pl b/proxy.1.pl
index 1c07bcb..6f46bff 100755
--- a/proxy.1.pl
+++ b/proxy.1.pl
@@ -1,7 +1,7 @@
 ###PERL;
 
 # proxy.pl is generated from proxy.1.pl
-# 02.01.2016
+# 29.08.2016
 #
 # This is the proxy software. It's launched as a CGI program by the http server.
 #
@@ -132,6 +132,8 @@ sub proxy {
 	my $lastskipped=1;   # if the previous header field was not forwarded
 	my $forceexit=0;     # if the proxy should exit with error
 	my $errormsg;
+	my $rangestart;      # first byte of partial content
+	my $rangelength;     # total length when partial content
 	
 	my $contentlength;
 	
@@ -458,6 +460,14 @@ sub proxy {
 					$contentlength = int($headval);
 				}
 				
+				# Only part of the content is transmitted in this request
+				if(($status =~ /^206/)&&($headname eq 'content-range')) {
+					if (lc($headval) =~ /^[\r\n \t]*bytes ([0-9]+)\-[0-9]\/([0-9]*)/) {
+						$rangestart = int($1);
+						$rangelength = int($2);
+					}
+				}
+				
 				# Some header fields should not be forwarded.
 				if($headname =~ RESPONSE_HEADER_BLOCK) {
 					$lastskipped =1;
@@ -469,7 +479,7 @@ sub proxy {
 			
 			# Only add the Content-length header if it's safe to do so.
 			if ($definedlength and ($safelength or ($contentlength==0))) {
-				push @resphead, 'Content-length: '.$contentlength;
+				push @resphead, 'Content-length: '.(($rangelength ne '')?$rangelength:$contentlength);
 			}
 			
 			# After forwarding the response header it's too late to send any error
@@ -478,7 +488,12 @@ sub proxy {
 			
 			# Forward the header and safe it to file if possible and allowed.
 			if ($archive) {
-				$respheadopen = open($respheadfile, ">", $respheadpath);
+				if($rangestart ne '') {
+					$respheadopen = open($respheadfile, ">>", $respheadpath);
+				}
+				else{
+					$respheadopen = open($respheadfile, ">", $respheadpath);
+				}
 			}
 			foreach $line (@resphead) {
 				print $line."\n";
@@ -509,13 +524,28 @@ sub proxy {
 					}
 					if ($firstline) {
 						if ($archive) {
-							$respcontopen = open($respcontfile, ">", $respcontpath);
+							if($rangestart ne '') {
+								if(-f $respcontpath) {
+									$respcontopen = open($respcontfile, "+<", $respcontpath);
+								}
+								else {
+									$respcontopen = open($respcontfile, ">", $respcontpath);
+								}
+							}
+							else {
+								$respcontopen = open($respcontfile, ">", $respcontpath);
+							}
 						}
 						if ($respcontopen){
 							unless (binmode($respcontfile)) {
 								close($respcontfile);
 								$respcontopen=0;
 							}
+							else {
+								if($rangestart ne '') {
+									seek($respcontfile,0,$rangestart);
+								}
+							}
 						}
 					}
 					$firstline=0;
@@ -524,6 +554,9 @@ sub proxy {
 					}
 				}
 				if($respcontopen) {
+					if($rangelength ne '') {
+						truncate($respcontfile,$rangelength);
+					}
 					close ($respcontfile);
 				}
 			}