initial commit

1 files changed, 44 insertions, 0 deletions

diff --git a/mavlink-library/src/main/scala/com/github/jodersky/mavlink/trees/package.scala b/mavlink-library/src/main/scala/com/github/jodersky/mavlink/trees/package.scala
new file mode 100644
index 0000000..49b697b
--- /dev/null
+++ b/mavlink-library/src/main/scala/com/github/jodersky/mavlink/trees/package.scala
@@ -0,0 +1,44 @@
+package com.github.jodersky.mavlink
+
+package trees {
+  
+  sealed trait Tree
+  
+  case class Dialect(version: String, enums: Set[Enum], messages: Set[Message]) extends Tree
+  case class Enum(name: String, entries: Set[EnumEntry]) extends Tree
+  case class EnumEntry(value: Int, name: String, description: String) extends Tree
+  case class Field(tpe: Type, nativeType: String, name: String, enum: Option[String], description: String) extends Tree
+  case class Message(id: Byte, name: String, description: String, fields: Seq[Field]) extends Tree {
+    def orderedFields = fields.toSeq.sortBy(_.tpe.width)(Ordering[Int].reverse)
+
+    lazy val checksum = {
+      var c = new Crc()
+      c = c.accumulate((name + " ").getBytes)
+      for (field <- orderedFields) {
+        c = c.accumulate((field.nativeType + " ").getBytes)
+        c = c.accumulate((field.name + " ").getBytes)
+      }
+      (c.lsb ^ c.msb).toByte
+    }
+  }
+  
+  trait Type extends Tree {
+    def width: Int // width in bytes of the type
+    def sizeof: Int = width // size of bytes of the type
+  }
+
+  case class IntType(width: Int, signed: Boolean) extends Type
+  case class FloatType(width: Int) extends Type
+  case class ArrayType(underlying: Type, length: Int) extends Type {
+    def width = underlying.width
+    override def sizeof = width * length
+  }
+  case object CharType extends Type {
+    def width = 1
+  }
+  case class StringType(maxLength: Int) extends Type {
+    val width = 1
+    override def sizeof = width * maxLength
+  }
+
+}
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