actually add the new export file

dump978_exports.go

@@ -0,0 +1,41 @@
+// Copyright (c) 2015 Joseph D Poirier
+// Distributable under the terms of The New BSD License
+// that can be found in the LICENSE file.
+
+// Package dump978 wraps libdump978, a 978MHz UAT demodulator.
+
+package dump978
+
+import (
+	"fmt"
+	"reflect"
+	"unsafe"
+)
+
+/*
+#include <stdint.h>
+#include "dump978/dump978.h"
+*/
+import "C"
+
+// OutChan is a buffered output channel for demodulated data.
+var OutChan = make(chan string, 100)
+
+//export dump978Cb
+func dump978Cb(updown C.char, data *C.uint8_t, length C.int) {
+	// c buffer to go slice without copying
+	var buf []byte
+
+	b := (*reflect.SliceHeader)((unsafe.Pointer(&buf)))
+	b.Cap = int(length)
+	b.Len = int(length)
+	b.Data = uintptr(unsafe.Pointer(data))
+
+	// copy incoming to outgoing
+	outData := string(updown)
+	for i := 0; i < int(length); i++ {
+		outData += fmt.Sprintf("%02x", buf[i])
+	}
+
+	OutChan <- outData
+}