Basic decoding of GVariant values (except for Variant).

Change-Id: I43e495a57c1f045b91ce01d89f2010f61b5fb8f5

1 files changed, 278 insertions, 0 deletions

diff --git a/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java b/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java
new file mode 100644
index 0000000..4deb8bc
--- /dev/null
+++ b/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java
@@ -0,0 +1,278 @@
+package eu.mulk.jgvariant.core;
+
+import static java.nio.ByteOrder.LITTLE_ENDIAN;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import eu.mulk.jgvariant.core.Value.Array;
+import eu.mulk.jgvariant.core.Value.Bool;
+import eu.mulk.jgvariant.core.Value.Int32;
+import eu.mulk.jgvariant.core.Value.Int8;
+import eu.mulk.jgvariant.core.Value.Maybe;
+import eu.mulk.jgvariant.core.Value.Str;
+import eu.mulk.jgvariant.core.Value.Structure;
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Optional;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests based on the examples given in <a
+ * href="https://people.gnome.org/~desrt/gvariant-serialisation.pdf">~desrt/gvariant-serialisation.pdf</a>.
+ */
+class DecoderTest {
+
+  @Test
+  void testString() {
+    var data = new byte[] {0x68, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x00};
+    var decoder = Decoder.ofStr(UTF_8);
+    assertEquals(new Str("hello world"), decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testMaybe() {
+    var data =
+        new byte[] {0x68, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x00, 0x00};
+    var decoder = Decoder.ofMaybe(Decoder.ofStr(UTF_8));
+    assertEquals(
+        new Maybe<>(Optional.of(new Str("hello world"))), decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testBooleanArray() {
+    var data = new byte[] {0x01, 0x00, 0x00, 0x01, 0x01};
+    var decoder = Decoder.ofArray(Decoder.ofBoolean());
+    assertEquals(
+        new Array<>(List.of(Bool.TRUE, Bool.FALSE, Bool.FALSE, Bool.TRUE, Bool.TRUE)),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testStructure() {
+    var data =
+        new byte[] {
+          0x66, 0x6F, 0x6F, 0x00, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, 0x04
+        };
+
+    record TestRecord(Str s, Int32 i) {}
+
+    var decoder = Decoder.ofStructure(TestRecord.class, Decoder.ofStr(UTF_8), Decoder.ofInt32());
+    assertEquals(
+        new Structure<>(new TestRecord(new Str("foo"), new Int32(-1))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testComplexStructureArray() {
+    var data =
+        new byte[] {
+          0x68,
+          0x69,
+          0x00,
+          0x00,
+          (byte) 0xfe,
+          (byte) 0xff,
+          (byte) 0xff,
+          (byte) 0xff,
+          0x03,
+          0x00,
+          0x00,
+          0x00,
+          0x62,
+          0x79,
+          0x65,
+          0x00,
+          (byte) 0xff,
+          (byte) 0xff,
+          (byte) 0xff,
+          (byte) 0xff,
+          0x04,
+          0x09,
+          0x15
+        };
+
+    record TestRecord(Str s, Int32 i) {}
+
+    var decoder =
+        Decoder.ofArray(
+            Decoder.ofStructure(
+                TestRecord.class,
+                Decoder.ofStr(UTF_8),
+                Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN)));
+    assertEquals(
+        new Array<>(
+            List.of(
+                new Structure<>(new TestRecord(new Str("hi"), new Int32(-2))),
+                new Structure<>(new TestRecord(new Str("bye"), new Int32(-1))))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testStringArray() {
+    var data =
+        new byte[] {
+          0x69, 0x00, 0x63, 0x61, 0x6E, 0x00, 0x68, 0x61, 0x73, 0x00, 0x73, 0x74, 0x72, 0x69, 0x6E,
+          0x67, 0x73, 0x3F, 0x00, 0x02, 0x06, 0x0a, 0x13
+        };
+    var decoder = Decoder.ofArray(Decoder.ofStr(UTF_8));
+    assertEquals(
+        new Array<>(List.of(new Str("i"), new Str("can"), new Str("has"), new Str("strings?"))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testNestedStructure() {
+    var data =
+        new byte[] {
+          0x69, 0x63, 0x61, 0x6E, 0x00, 0x68, 0x61, 0x73, 0x00, 0x73, 0x74, 0x72, 0x69, 0x6E, 0x67,
+          0x73, 0x3F, 0x00, 0x04, 0x0d, 0x05
+        };
+
+    record TestChild(Int8 b, Str s) {}
+    record TestParent(Structure<TestChild> tc, Array<Str> as) {}
+
+    var decoder =
+        Decoder.ofStructure(
+            TestParent.class,
+            Decoder.ofStructure(TestChild.class, Decoder.ofInt8(), Decoder.ofStr(UTF_8)),
+            Decoder.ofArray(Decoder.ofStr(UTF_8)));
+
+    assertEquals(
+        new Structure<>(
+            new TestParent(
+                new Structure<>(new TestChild(new Int8((byte) 0x69), new Str("can"))),
+                new Array<>(List.of(new Str("has"), new Str("strings?"))))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testSimpleStructure() {
+    var data = new byte[] {0x60, 0x70};
+
+    record TestRecord(Int8 b1, Int8 b2) {}
+
+    var decoder =
+        Decoder.ofStructure(
+            TestRecord.class,
+            Decoder.ofInt8().withByteOrder(LITTLE_ENDIAN),
+            Decoder.ofInt8().withByteOrder(LITTLE_ENDIAN));
+
+    assertEquals(
+        new Structure<>(new TestRecord(new Int8((byte) 0x60), new Int8((byte) 0x70))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testPaddedStructureRight() {
+    var data = new byte[] {0x60, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00};
+
+    record TestRecord(Int32 b1, Int8 b2) {}
+
+    var decoder =
+        Decoder.ofStructure(
+            TestRecord.class,
+            Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN),
+            Decoder.ofInt8().withByteOrder(LITTLE_ENDIAN));
+
+    assertEquals(
+        new Structure<>(new TestRecord(new Int32(0x60), new Int8((byte) 0x70))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testPaddedStructureLeft() {
+    var data = new byte[] {0x60, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00};
+
+    record TestRecord(Int8 b1, Int32 b2) {}
+
+    var decoder =
+        Decoder.ofStructure(
+            TestRecord.class,
+            Decoder.ofInt8().withByteOrder(LITTLE_ENDIAN),
+            Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN));
+
+    assertEquals(
+        new Structure<>(new TestRecord(new Int8((byte) 0x60), new Int32(0x70))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testSimpleStructureArray() {
+    var data =
+        new byte[] {
+          0x60,
+          0x00,
+          0x00,
+          0x00,
+          0x70,
+          0x00,
+          0x00,
+          0x00,
+          (byte) 0x88,
+          0x02,
+          0x00,
+          0x00,
+          (byte) 0xF7,
+          0x00,
+          0x00,
+          0x00
+        };
+
+    record TestRecord(Int32 b1, Int8 b2) {}
+
+    var decoder =
+        Decoder.ofArray(
+            Decoder.ofStructure(
+                TestRecord.class,
+                Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN),
+                Decoder.ofInt8().withByteOrder(LITTLE_ENDIAN)));
+
+    assertEquals(
+        new Array<>(
+            List.of(
+                new Structure<>(new TestRecord(new Int32(96), new Int8((byte) 0x70))),
+                new Structure<>(new TestRecord(new Int32(648), new Int8((byte) 0xf7))))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testByteArray() {
+    var data = new byte[] {0x04, 0x05, 0x06, 0x07};
+
+    var decoder = Decoder.ofArray(Decoder.ofInt8());
+
+    assertEquals(
+        new Array<>(
+            List.of(
+                new Int8((byte) 0x04),
+                new Int8((byte) 0x05),
+                new Int8((byte) 0x06),
+                new Int8((byte) 0x07))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testIntegerArray() {
+    var data = new byte[] {0x04, 0x00, 0x00, 0x00, 0x02, 0x01, 0x00, 0x00};
+
+    var decoder = Decoder.ofArray(Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN));
+
+    assertEquals(
+        new Array<>(List.of(new Int32(4), new Int32(258))), decoder.decode(ByteBuffer.wrap(data)));
+  }
+
+  @Test
+  void testDictionaryEntry() {
+    var data =
+        new byte[] {0x61, 0x20, 0x6B, 0x65, 0x79, 0x00, 0x00, 0x00, 0x02, 0x02, 0x00, 0x00, 0x06};
+
+    record TestEntry(Str key, Int32 value) {}
+
+    var decoder =
+        Decoder.ofStructure(
+            TestEntry.class, Decoder.ofStr(UTF_8), Decoder.ofInt32().withByteOrder(LITTLE_ENDIAN));
+    assertEquals(
+        new Structure<>(new TestEntry(new Str("a key"), new Int32(514))),
+        decoder.decode(ByteBuffer.wrap(data)));
+  }
+}