Initial reflection and resizing functionality.

Tested: on Linux.

Change-Id: I8f7bccf9b1ad87fea788f85e23fa69435758feca

reflection/reflection.fbs

@@ -0,0 +1,79 @@
+// This schema defines objects that represent a parsed schema, like
+// the binary version of a .fbs file.
+// This could be used to operate on unknown FlatBuffers at runtime.
+// It can even ... represent itself (!)
+
+namespace reflection;
+
+// These must correspond to the enum in idl.h.
+enum BaseType : byte {
+    None,
+    UType,
+    Bool,
+    Byte,
+    UByte,
+    Short,
+    UShort,
+    Int,
+    UInt,
+    Long,
+    ULong,
+    Float,
+    Double,
+    String,
+    Vector,
+    Obj,     // Used for tables & structs.
+    Union    //
+}
+
+table Type {
+    base_type:BaseType;
+    element:BaseType = None;  // Only if base_type == Vector.
+    index:int = -1;  // If base_type == Object, index into "objects" below.
+                     // If base_type == Union, UnionType, or integral derived
+                     // from an enum, index into "enums" below.
+}
+
+table EnumVal {
+    name:string (required);
+    value:long (key);
+    object:Object;  // Only if part of a union.
+}
+
+table Enum {
+    name:string (required, key);
+    values:[EnumVal] (required);  // In order of their values.
+    is_union:bool = false;
+    underlying_type:Type (required);
+}
+
+table Field {
+    name:string (required, key);
+    type:Type (required);
+    id:ushort;
+    offset:ushort;  // Offset into the vtable for tables, or into the struct.
+    default_integer:long = 0;
+    default_real:double = 0.0;
+    deprecated:bool = false;
+    required:bool = false;
+    key:bool = false;
+}
+
+table Object {  // Used for both tables and structs.
+    name:string (required, key);
+    fields:[Field] (required);  // Sorted.
+    is_struct:bool = false;
+}
+
+table Schema {
+    objects:[Object] (required);  // Sorted.
+    enums:[Enum] (required);      // Sorted.
+    file_ident:string;
+    file_ext:string;
+    root_table:Object;
+}
+
+root_type Schema;
+
+file_identifier "BFBS";
+file_extension "bfbs";