Add LEB128 encoding for padded 64-bit ints

1 files changed, 36 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128EncodingTests.java b/src/test/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128EncodingTests.java
index f9ef502d..270bcb44 100644
--- a/src/test/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128EncodingTests.java
+++ b/src/test/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128EncodingTests.java
@@ -78,6 +78,21 @@ public class Leb128EncodingTests {
     }
 
     @Test
+    public void paddedUnsignedInt64Encoding() {
+        assertPaddedUnsignedInt64Encoding(0x00, "80808080808080808000");
+        assertPaddedUnsignedInt64Encoding(0x01, "81808080808080808000");
+        assertPaddedUnsignedInt64Encoding(0x7F, "ff808080808080808000");
+        assertPaddedUnsignedInt64Encoding(0x80, "80818080808080808000");
+        assertPaddedUnsignedInt64Encoding(Long.MAX_VALUE, "ffffffffffffffffff00");
+    }
+
+    private void assertPaddedUnsignedInt64Encoding(long value, String expectedHex) {
+        var writer = new BinaryWriter();
+        Leb128Encoding.encodePaddedUnsignedInt64(value, writer);
+        assertByteArray(writer.toBytes(), expectedHex);
+    }
+
+    @Test
     public void signedInt64Encoding() {
         assertSignedInt64Encoding(0x0, "00");
         assertSignedInt64Encoding(0x1, "01");
@@ -98,6 +113,27 @@ public class Leb128EncodingTests {
         assertByteArray(writer.toBytes(), expectedHex);
     }
 
+    @Test
+    public void paddedSignedInt64Encoding() {
+        assertPaddedSignedInt64Encoding(0x00, "80808080808080808000");
+        assertPaddedSignedInt64Encoding(0x01, "81808080808080808000");
+        assertPaddedSignedInt64Encoding(0x3F, "bf808080808080808000");
+        assertPaddedSignedInt64Encoding(0x40, "c0808080808080808000");
+        assertPaddedSignedInt64Encoding(0x7F, "ff808080808080808000");
+        assertPaddedSignedInt64Encoding(0x80, "80818080808080808000");
+        assertPaddedSignedInt64Encoding(-0x1, "ffffffffffffffffff7f");
+        assertPaddedSignedInt64Encoding(-0x40, "c0ffffffffffffffff7f");
+        assertPaddedSignedInt64Encoding(-0x41, "bfffffffffffffffff7f");
+        assertPaddedSignedInt64Encoding(Long.MAX_VALUE, "ffffffffffffffffff00");
+        assertPaddedSignedInt64Encoding(Long.MIN_VALUE, "8080808080808080807f");
+    }
+
+    private void assertPaddedSignedInt64Encoding(long value, String expectedHex) {
+        var writer = new BinaryWriter();
+        Leb128Encoding.encodePaddedSignedInt64(value, writer);
+        assertByteArray(writer.toBytes(), expectedHex);
+    }
+
     private void assertByteArray(byte[] actual, String expectedHex) {
         assertThat(HexFormat.of().formatHex(actual), equalTo(expectedHex));
     }