RedfishPkg/JsonLib: Add JsonLoadString function

Add JsonLoadString function to load a NULL terminated-string JSON

Signed-off-by: Abner Chang <abner.chang@hpe.com>

Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Nickle Wang <nickle.wang@hpe.com>

RedfishPkg/Include/Library/JsonLib.h

@@ -664,6 +664,27 @@ JsonDumpString (
   IN    UINTN               Flags
   );
 
+/**
+  Convert a string to JSON object.
+  The function is used to convert a NULL terminated CHAR8 string to a JSON
+  value. Only object and array represented strings can be converted successfully,
+  since they are the only valid root values of a JSON text for UEFI usage.
+
+  Real number and number with exponent part are not supportted by UEFI.
+
+  Caller needs to cleanup the root value by calling JsonValueFree().
+
+  @param[in]   String        The NULL terminated CHAR8 string to convert.
+
+  @retval      Array JSON value or object JSON value, or NULL when any error occurs.
+
+**/
+EDKII_JSON_VALUE
+EFIAPI
+JsonLoadString (
+  IN   CONST CHAR8*    String
+  );
+
 /**
   Load JSON from a buffer.