Add day 8 part 2

Author: jvgrootveld

2015/src/main/kotlin/day08/Day08.kt

@@ -17,8 +17,40 @@ class Day08 {
             return Day08Result(stateMachine.lineResults)
         }
 
-        fun part2(input: List<String>): Int {
-            TODO("IMPLEMENT")
+        fun part2(input: ByteArray): Int {
+            var totalResult = 0
+            var charCountOriginal = 0
+            var charCountEncoded = 0
+
+            fun resetCount() {
+                charCountOriginal = 0
+                charCountEncoded = 2 // 2 for added surrounding quotes
+            }
+
+            resetCount()
+
+            for (charBytes in input) {
+
+                if (charBytes == CharBytes.NEW_LINE.byte) {
+                    // Add and reset
+                    totalResult += charCountEncoded - charCountOriginal
+                    resetCount()
+                    continue
+                }
+
+                charCountOriginal++
+
+                when(charBytes) {
+                    CharBytes.SLASH.byte -> charCountEncoded += 2
+                    CharBytes.QUOTE.byte -> charCountEncoded += 2
+                    else -> charCountEncoded++
+                }
+            }
+
+            // Add the last line
+            totalResult += charCountEncoded - charCountOriginal
+
+            return totalResult
         }
 
         class Day08Result(val lineResults: List<LineResult>) {

2015/src/test/kotlin/Day08Test.kt

@@ -31,15 +31,18 @@ internal class Day08Test {
 
     @ParameterizedTest
     @CsvSource(
-        "input, 0",
+        "\"\", 4",             // "" encodes to "\"\""                  =  6 -  2 = 4
+        "\"abc\", 4",         // "abc" encodes to "\"abc\""             =  9 -  5 = 4
+        "\"aaa\\\"aaa\", 6",  // "aaa\"aaa" encodes to "\"aaa\\\"aaa\"" = 16 - 10 = 6
+        "\"\\x27\", 5",       // "\x27" encodes to "\"\\x27\""          = 11 -  6 = 5
     )
     fun `part2 examples`(input: String, expectedResult: Int) {
-        assertEquals(expectedResult, Day08.part2(listOf(input)))
+        assertEquals(expectedResult, Day08.part2(input.toByteArray()))
     }
 
     @Test
     fun `part2 puzzel input`() {
-        val input = Resource.readFileLines("day08")
-        assertEquals(0, Day08.part2(input))
+        val input = Resource.readFileAsBytes("day08")
+        assertEquals(2046, Day08.part2(input))
     }
 }