[PATCH v2 07/16] xdrgen: XDR width for a string

[cel@xxxxxxxxxx]

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

A string works like a variable-length opaque. See Section 4.11 of
RFC 4506.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 tools/net/sunrpc/xdrgen/xdr_ast.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/net/sunrpc/xdrgen/xdr_ast.py b/tools/net/sunrpc/xdrgen/xdr_ast.py
index 94cdcfb36e77..d5f48c094729 100644
--- a/tools/net/sunrpc/xdrgen/xdr_ast.py
+++ b/tools/net/sunrpc/xdrgen/xdr_ast.py
@@ -172,6 +172,21 @@ class _XdrString(_XdrDeclaration):
     maxsize: str
     template: str = "string"
 
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1 + xdr_quadlen(self.maxsize)
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = ["XDR_unsigned_int"]
+        if self.maxsize != "0":
+            widths.append("XDR_QUADLEN(" + self.maxsize + ")")
+        return widths
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
 
 @dataclass
 class _XdrFixedLengthArray(_XdrDeclaration):
-- 
2.46.2