Checks that legacy_page_size is power of 2 and in range

closes #91

src/main/java/org/sqlite/mc/SQLiteMCConfig.java

@@ -186,6 +186,9 @@ public Builder setFastKdfIter(int value) {
         }
 
         public Builder setLegacyPageSize(int value) {
+            if (value < 0 || value > 65536 || (value & (value - 1)) != 0){
+                throw new IllegalArgumentException("legacy_page_size must be a power of 2 between 0 and 65536");
+            }
             setPragma(Pragma.LEGACY_PAGE_SIZE, String.valueOf(value));
             return this;
         }

src/test/java/org/sqlite/mc/SQLiteMCConfigTest.java

@@ -0,0 +1,28 @@
+package org.sqlite.mc;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Properties;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
+import static org.sqlite.SQLiteConfig.Pragma.LEGACY_PAGE_SIZE;
+
+class SQLiteMCConfigTest {
+
+    @Test
+    public void builderSetLegacyPageSizeTest() {
+        Properties p = new SQLiteMCConfig.Builder().setLegacyPageSize(0).build().toProperties();
+        assertThat(p.get(LEGACY_PAGE_SIZE.getPragmaName())).isEqualTo("0");
+
+        p = new SQLiteMCConfig.Builder().setLegacyPageSize(65536).build().toProperties();
+        assertThat(p.get(LEGACY_PAGE_SIZE.getPragmaName())).isEqualTo("65536");
+
+        p = new SQLiteMCConfig.Builder().setLegacyPageSize(1024).build().toProperties();
+        assertThat(p.get(LEGACY_PAGE_SIZE.getPragmaName())).isEqualTo("1024");
+
+        assertThatIllegalArgumentException().isThrownBy(() -> new SQLiteMCConfig.Builder().setLegacyPageSize(-1));
+        assertThatIllegalArgumentException().isThrownBy(() -> new SQLiteMCConfig.Builder().setLegacyPageSize(65637));
+        assertThatIllegalArgumentException().isThrownBy(() -> new SQLiteMCConfig.Builder().setLegacyPageSize(1233));
+    }
+}