img: Add text for known flags

Currently there are open flags on reg-files and vma
flags and prot.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

protobuf/regfile.proto

@@ -3,7 +3,7 @@ import "fown.proto";
 
 message reg_file_entry {
 	required uint32		id	= 1;
-	required uint32		flags	= 2 [(criu).hex = true];
+	required uint32		flags	= 2 [(criu).flags = "rfile.flags"];
 	required uint64		pos	= 3;
 	required fown_entry	fown	= 5;
 	required string		name	= 6;

protobuf/vma.proto

@@ -5,8 +5,8 @@ message vma_entry {
 	required uint64		end	= 2 [(criu).hex = true];
 	required uint64		pgoff	= 3;
 	required uint64		shmid	= 4;
-	required uint32		prot	= 5 [(criu).hex = true];
-	required uint32		flags	= 6 [(criu).hex = true];
+	required uint32		prot	= 5 [(criu).flags = "mmap.prot" ];
+	required uint32		flags	= 6 [(criu).flags = "mmap.flags" ];
 	required uint32		status	= 7;
 	/*
 	 * This fd thing is unused in the image, it was lost

pycriu/images/pb2dict.py

@@ -52,7 +52,30 @@ def _marked_as_ip(field):
 def _marked_as_flags(field):
 	return field.GetOptions().Extensions[opts_pb2.criu].flags
 
+mmap_prot_map = [
+	('PROT_READ',	0x1),
+	('PROT_WRITE',	0x2),
+	('PROT_EXEC',	0x4),
+];
+
+mmap_flags_map = [
+	('MAP_SHARED',	0x1),
+	('MAP_PRIVATE',	0x2),
+	('MAP_ANON',	0x20),
+];
+
+rfile_flags_map = [
+	('O_WRONLY',	01),
+	('O_RDWR',	02),
+	('O_APPEND',	02000),
+	('O_DIRECT',	040000),
+	('O_LARGEFILE',	0100000),
+];
+
 flags_maps = {
+	'mmap.prot' : mmap_prot_map,
+	'mmap.flags' : mmap_flags_map,
+	'rfile.flags' : rfile_flags_map,
 }
 
 def map_flags(value, flags_map):