Add HTTP test support

src/usr/fetch.c

 #include <usr/fetch.h>
 
 #include <byteswap.h>
-#include <gpxe/tftp.h>
 #include <gpxe/dhcp.h>
+#include <gpxe/tftp.h>
+#include <gpxe/http.h>
 
 /**
  * Fetch file
 	if ( ( rc = ebuffer_alloc ( &buffer, 0 ) ) != 0 )
 		return rc;
 
+#warning "Temporary pseudo-URL parsing code"
+
 	/* Retrieve the file */
-	struct tftp_session tftp;
 	union {
 		struct sockaddr_tcpip st;
 		struct sockaddr_in sin;
 	} server;
+	struct tftp_session tftp;
+	struct http_request http;
+	struct async_operation *aop;
 
 	memset ( &tftp, 0, sizeof ( tftp ) );
+	memset ( &http, 0, sizeof ( http ) );
 	memset ( &server, 0, sizeof ( server ) );
 	server.sin.sin_family = AF_INET;
 	find_global_dhcp_ipv4_option ( DHCP_EB_SIADDR,
 				       &server.sin.sin_addr );
+
+
+#if 0
 	server.sin.sin_port = htons ( TFTP_PORT );
 	udp_connect ( &tftp.udp, &server.st );
 	tftp.filename = filename;
 	tftp.buffer = &buffer;
-	if ( ( rc = async_wait ( tftp_get ( &tftp ) ) ) != 0 ) {
+	aop = tftp_get ( &tftp );
+#else
+	server.sin.sin_port = htons ( HTTP_PORT );
+	memcpy ( &http.server, &server, sizeof ( http.server ) );
+	http.hostname = inet_ntoa ( server.sin.sin_addr );
+	http.filename = filename;
+	http.buffer = &buffer;
+	aop = http_get ( &http );
+#endif
+
+	if ( ( rc = async_wait ( aop ) ) != 0 ) {
 		efree ( buffer.addr );
 		return rc;
 	}