added automatic support for and an eh? method for sqlcipher

ext/sqlite3/extconf.rb

@@ -39,8 +39,8 @@
 
 # --with-sqlite3-{dir,include,lib}
 if with_config('sqlcipher')
+  $CFLAGS << ' -DUSING_SQLCIPHER'
   dir_config("sqlcipher", cppflags, ldflags)
-  $CFLAGS << ' -DSQLITE_HAS_CODEC -DSQLITE_TEMP_STORE=2'
 else
   dir_config("sqlite3", cppflags, ldflags)
 end
@@ -67,7 +67,7 @@ def asplode missing
 find_library 'pthread', 'pthread_create' # 1.8 support. *shrug*
 
 if with_config('sqlcipher')
-  asplode('sqlcipher') unless find_library 'sqlcipher', 'codec_get_cipher_version'
+  asplode('sqlcipher') unless find_library 'sqlcipher', 'sqlite3_libversion_number'
 else
   asplode('sqlite3') unless find_library 'sqlite3', 'sqlite3_libversion_number'
 end

ext/sqlite3/sqlite3.c

@@ -65,12 +65,14 @@ static VALUE libversion(VALUE UNUSED(klass))
   return INT2NUM(sqlite3_libversion_number());
 }
 
-#ifdef CIPHER_VERSION
-static VALUE cipherversion(VALUE UNUSED(klass))
+static VALUE using_sqlcipher(VALUE UNUSED(klass))
 {
-  return rb_str_new2(codec_get_cipher_version());
-}
+#ifdef USING_SQLCIPHER
+  return Qtrue;
+#else
+  return Qfalse;
 #endif
+}
 
 /* Returns the compile time setting of the SQLITE_THREADSAFE flag.
  * See: https://www.sqlite.org/c3ref/threadsafe.html
@@ -151,9 +153,7 @@ void Init_sqlite3_native()
 #ifdef HAVE_SQLITE3_BACKUP_INIT
   init_sqlite3_backup();
 #endif
-#ifdef CIPHER_VERSION
-  rb_define_singleton_method(mSqlite3, "cipherversion", cipherversion, 0);
-#endif
+  rb_define_singleton_method(mSqlite3, "sqlcipher?", using_sqlcipher, 0);
   rb_define_singleton_method(mSqlite3, "libversion", libversion, 0);
   rb_define_singleton_method(mSqlite3, "threadsafe", threadsafe_p, 0);
   rb_define_const(mSqlite3, "SQLITE_VERSION", rb_str_new2(SQLITE_VERSION));