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mothra: handle http compression out of band

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -825,6 +825,7 @@

 int urlopen(Url *url, int method, char *body){

 	int conn, ctlfd, fd, n;

 	char buf[1024+1], *p;

+	char encoding[64];

 	if(debug) fprint(2, "urlopen %s (%s)\n", url->reltext, url->basename); 

@@ -863,11 +864,19 @@

 	}

 	snprint(buf, sizeof buf, "%s/%d/body", mtpt, conn);

 	if((fd = open(buf, OREAD)) < 0)

-		goto ErrOut;

+		goto ErrOut;	

 	snprint(buf, sizeof buf, "%s/%d/parsed", mtpt, conn);

 	readstr(url->fullname, sizeof(url->fullname), buf, "url");

 	readstr(url->tag, sizeof(url->tag), buf, "fragment");

+	snprint(buf, sizeof buf, "%s/%d", mtpt, conn);

+	readstr(encoding, sizeof(encoding), buf, "contentencoding");

 	close(ctlfd);

+	if(!cistrcmp(encoding, "compress"))

+		fd = pipeline("/bin/uncompress", fd);

+	else if(!cistrcmp(encoding, "gzip"))

+		fd = pipeline("/bin/gunzip", fd);

+	else if(!cistrcmp(encoding, "bzip2"))

+		fd = pipeline("/bin/bunzip2", fd);

 	return fd;

 }

@@ -955,17 +964,8 @@

 		message("getting %s", selection->fullname);

 		if(mothmode && !plumb)

 			typ = -1;

-		else {

+		else

 			typ = snooptype(fd);

-			if(typ == GUNZIP){

-				fd=pipeline("/bin/gunzip", fd);

-				typ = snooptype(fd);

-			}

-			if(typ == COMPRESS){

-				fd=pipeline("/bin/uncompress", fd);

-				typ = snooptype(fd);

-			}

-		}

 		switch(typ){

 		default:

 			if(plumb){

--- a/sys/src/cmd/mothra/mothra.h

+++ b/sys/src/cmd/mothra/mothra.h

@@ -52,8 +52,6 @@

 	BMP,

 	ICO,

-	GUNZIP,

-	COMPRESS,

 	PAGE,

 };

--- a/sys/src/cmd/mothra/snoop.c

+++ b/sys/src/cmd/mothra/snoop.c

@@ -102,9 +102,6 @@

 	"image/bmp",			BMP,

 	"image/x-icon",			ICO,

-	"application/x-gzip",		GUNZIP,

-	"application/x-compress",	COMPRESS,

-

 	"application/pdf",		PAGE,

 	"application/postscript",	PAGE,

 	"application/ghostscript",	PAGE,