Add LEB128 encoding for padded 64-bit ints

1 files changed, 22 insertions, 0 deletions

diff --git a/src/main/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128Encoding.java b/src/main/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128Encoding.java
index 87d91520..71076da9 100644
--- a/src/main/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128Encoding.java
+++ b/src/main/java/org/shedlang/compiler/backends/wasm/structure/binary/Leb128Encoding.java
@@ -65,6 +65,15 @@ public class Leb128Encoding {
         }
     }
 
+    static void encodePaddedUnsignedInt64(long value, BinaryWriter writer) {
+        for (var byteIndex = 0; byteIndex < 9; byteIndex++) {
+            var nextByte = value & 0x7f;
+            writer.writeByte((byte) (nextByte | 0x80));
+            value >>>= 7;
+        }
+        writer.writeByte((byte) value);
+    }
+
     static void encodeSignedInt64(long value, BinaryWriter writer) {
         if (value >= 0) {
             while (true) {
@@ -88,4 +97,17 @@ public class Leb128Encoding {
             }
         }
     }
+
+    static void encodePaddedSignedInt64(long value, BinaryWriter writer) {
+        if (value > 0) {
+            encodePaddedUnsignedInt64(value, writer);
+        } else {
+            for (var byteIndex = 0; byteIndex < 9; byteIndex++) {
+                var nextByte = value & 0x7f;
+                writer.writeByte((byte) (nextByte | 0x80));
+                value >>= 7;
+            }
+            writer.writeByte((byte) (value & 0x7f));
+        }
+    }
 }