Add binary imports

CodegenBot/Imports.cs

@@ -18,6 +18,30 @@ public interface ICodegenBotImports
 /// </summary>
 public class CodegenBotImports : ICodegenBotImports
 {
+    [DllImport("extism", EntryPoint = "cgb_append_to_binary_file")]
+    public static extern ulong ExternRead(ulong pathOffset, ulong bytesOffset);
+
+    public byte[] AppendToBinaryFile(string filePath, byte[] binary)
+    {
+        using var block = Pdk.Allocate(filePath);
+        using var binaryBlock = Pdk.Allocate(binary);
+        var ptr = ExternRead(block.Offset, binaryBlock.Offset);
+        var bytes = MemoryBlock.Find(ptr).ReadBytes();
+        return bytes;
+    }
+
+    [DllImport("extism", EntryPoint = "cgb_read_binary_file")]
+    public static extern ulong ExternRead(ulong jsonOffset);
+
+    public byte[] ReadBinaryFile(ReadBinaryFile binaryFile)
+    {
+        var json = JsonSerializer.Serialize(binaryFile, ReadBinaryFileJsonSerializerContext.Default.ReadBinaryFile);
+        using var block = Pdk.Allocate(json);
+        var ptr = ExternRead(block.Offset);
+        var bytes = MemoryBlock.Find(ptr).ReadBytes();
+        return bytes;
+    }
+
     [DllImport("extism", EntryPoint = "cgb_graphql")]
     public static extern ulong ExternGraphQL(ulong offset);