Merge pull request #169 from jimflood/sqlite3_result_blob

BLOB function result when ASCII-8BIT encoding

Author: tenderlove

ext/sqlite3/database.c

@@ -288,7 +288,14 @@ static VALUE sqlite3val2rb(sqlite3_value * val)
          which is what we want, as blobs are binary
        */
       int len = sqlite3_value_bytes(val);
+#ifdef HAVE_RUBY_ENCODING_H
       return rb_tainted_str_new((const char *)sqlite3_value_blob(val), len);
+#else
+      /* When encoding is not available, make it class SQLite3::Blob. */
+      VALUE strargv[1];
+      strargv[0] = rb_tainted_str_new((const char *)sqlite3_value_blob(val), len);
+      return rb_class_new_instance(1, strargv, cSqlite3Blob);
+#endif
       break;
     }
     case SQLITE_NULL:
@@ -322,12 +329,25 @@ static void set_sqlite3_func_result(sqlite3_context * ctx, VALUE result)
       sqlite3_result_double(ctx, NUM2DBL(result));
       break;
     case T_STRING:
-      sqlite3_result_text(
-          ctx,
-          (const char *)StringValuePtr(result),
-          (int)RSTRING_LEN(result),
-          SQLITE_TRANSIENT
-      );
+      if(CLASS_OF(result) == cSqlite3Blob
+#ifdef HAVE_RUBY_ENCODING_H
+              || rb_enc_get_index(result) == rb_ascii8bit_encindex()
+#endif
+        ) {
+        sqlite3_result_blob(
+            ctx,
+            (const void *)StringValuePtr(result),
+            (int)RSTRING_LEN(result),
+            SQLITE_TRANSIENT
+        );
+      } else {
+        sqlite3_result_text(
+            ctx,
+            (const char *)StringValuePtr(result),
+            (int)RSTRING_LEN(result),
+            SQLITE_TRANSIENT
+        );
+      }
       break;
     default:
       rb_raise(rb_eRuntimeError, "can't return %s",

test/test_database.rb

@@ -261,12 +261,19 @@ def test_function_return
     end
 
     def test_function_return_types
-      [10, 2.2, nil, "foo"].each do |thing|
+      [10, 2.2, nil, "foo", Blob.new("foo\0bar")].each do |thing|
         @db.define_function("hello") { |a| thing }
         assert_equal [thing], @db.execute("select hello('world')").first
       end
     end
 
+    def test_function_return_type_round_trip
+      [10, 2.2, nil, "foo", Blob.new("foo\0bar")].each do |thing|
+        @db.define_function("hello") { |a| a }
+        assert_equal [thing], @db.execute("select hello(hello(?))", [thing]).first
+      end
+    end
+
     def test_define_function_closed
       @db.close
       assert_raise(SQLite3::Exception) do