xC-gen-proto: reduce enums to single bytes

That's already way more than we can possibly use.

xC-gen-proto-go.awk

@@ -161,7 +161,7 @@ function codegen_begin() {
 	print "\tvar n int64"
 	print "\tif err := json.Unmarshal(data, &n); err != nil {"
 	print "\t\treturn 0, err"
-	print "\t} else if n > math.MaxInt32 || n < math.MinInt32 {"
+	print "\t} else if n > math.MaxInt8 || n < math.MinInt8 {"
 	print "\t\treturn 0, errors.New(`integer out of range`)"
 	print "\t} else {"
 	print "\t\treturn n, nil"
@@ -191,7 +191,7 @@ function codegen_enum_value(name, subname, value, cg,    goname) {
 
 function codegen_enum(name, cg,    gotype, fields) {
 	gotype = PrefixCamel name
-	print "type " gotype " int"
+	print "type " gotype " int8"
 	print ""
 
 	print "const ("
@@ -239,12 +239,10 @@ function codegen_enum(name, cg,    gotype, fields) {
 
 	# XXX: This should also check if it isn't out-of-range for any reason,
 	# but our usage of sprintf() stands in the way a bit.
-	CodegenSerialize[name] = \
-		"\tdata = binary.BigEndian.AppendUint32(data, uint32(%s))\n"
+	CodegenSerialize[name] = "\tdata = append(data, uint8(%s))\n"
 	CodegenDeserialize[name] = \
-		"\tif len(data) >= 4 {\n" \
-		"\t\t%s = " gotype "(int32(binary.BigEndian.Uint32(data)))\n" \
-		"\t\tdata = data[4:]\n" \
+		"\tif len(data) >= 1 {\n" \
+		"\t\t%s, data = " gotype "(data[0]), data[1:]\n" \
 		"\t} else {\n" \
 		"\t\treturn nil, false\n" \
 		"\t}\n"