Initial commit

vb-nfc-reader/src/main/java/com/github/cfogrady/vbnfc/Utils.kt

@@ -0,0 +1,20 @@
+package com.github.cfogrady.vbnfc
+
+// ConverToPages converts the byte array into the paged structure used in NFC communication
+// If data for the header isn't included, the first 8 pages will be 0 filled.
+fun ConvertToPages(data: ByteArray, header: ByteArray? = null) : List<ByteArray> {
+    val pages = ArrayList<ByteArray>()
+    // setup blank header pages
+    for (i in 0..7) {
+        if (header != null) {
+            val index = i*4
+            pages.add(header.sliceArray(index..<index+4))
+        } else {
+            pages.add(byteArrayOf(0, 0, 0, 0))
+        }
+    }
+    for(i in data.indices step 4) {
+        pages.add(data.sliceArray(i..<i+4))
+    }
+    return pages
+}