Make Oid unsigned

Closes rust-postgres#26

Author: sfackler

message.rs

@@ -345,7 +345,7 @@ fn read_parameter_description(buf: &mut MemReader) -> BackendMessage {
     let mut types = vec::with_capacity(len);
 
     for _ in range(0, len) {
-        types.push(buf.read_be_i32());
+        types.push(buf.read_be_u32());
     }
 
     ParameterDescription { types: types }
@@ -358,9 +358,9 @@ fn read_row_description(buf: &mut MemReader) -> BackendMessage {
     for _ in range(0, len) {
         types.push(RowDescriptionEntry {
             name: buf.read_cstr(),
-            table_oid: buf.read_be_i32(),
+            table_oid: buf.read_be_u32(),
             column_id: buf.read_be_i16(),
-            type_oid: buf.read_be_i32(),
+            type_oid: buf.read_be_u32(),
             type_size: buf.read_be_i16(),
             type_modifier: buf.read_be_i32(),
             format: buf.read_be_i16()

types/mod.rs

@@ -21,7 +21,7 @@ pub mod array;
 pub mod range;
 
 /// A Postgres OID
-pub type Oid = i32;
+pub type Oid = u32;
 
 // Values from pg_type.h
 static BOOLOID: Oid = 16;
@@ -404,7 +404,7 @@ macro_rules! from_array_impl(
 
             let ndim = rdr.read_be_i32() as uint;
             let _has_null = rdr.read_be_i32() == 1;
-            let _element_type: Oid = rdr.read_be_i32();
+            let _element_type: Oid = rdr.read_be_u32();
 
             let mut dim_info = vec::with_capacity(ndim);
             for _ in range(0, ndim) {
@@ -685,7 +685,7 @@ macro_rules! to_array_impl(
 
                 buf.write_be_i32(self.dimension_info().len() as i32);
                 buf.write_be_i32(1);
-                buf.write_be_i32(ty.member_type().to_oid());
+                buf.write_be_u32(ty.member_type().to_oid());
 
                 for info in self.dimension_info().iter() {
                     buf.write_be_i32(info.len as i32);