read world info

src/net/torvald/terrarum/serialise/ReadWorldInfo.kt

@@ -0,0 +1,69 @@
+package net.torvald.terrarum.serialise
+
+import java.io.File
+import java.io.FileInputStream
+import java.util.*
+import net.torvald.terrarum.modulecomputers.virtualcomputer.tvd.DiskSkimmer.Companion.read
+
+
+object ReadWorldInfo {
+
+    // FIXME UNTESTED
+
+    internal operator fun invoke(file: File): SaveMetaData {
+
+        val magic = ByteArray(4)
+        val worldNameUTF8 = ArrayList<Byte>()
+
+        val fis = FileInputStream(file)
+
+        fis.read(magic)
+        if (!Arrays.equals(magic, WriteWorldInfo.META_MAGIC)) {
+            throw IllegalArgumentException("File not a Save Meta")
+        }
+
+        var byteRead = fis.read()
+        while (byteRead != 0) {
+            if (byteRead == -1)
+                throw InternalError("Unexpected EOF")
+
+            worldNameUTF8.add(byteRead.toByte())
+            byteRead = fis.read()
+        }
+
+        return SaveMetaData(
+                String(worldNameUTF8.toByteArray(), Charsets.UTF_8),
+                fis.read(8).toLittleLong(), // terrain seed
+                fis.read(8).toLittleLong(), // rng s0
+                fis.read(8).toLittleLong(), // rng s1
+                fis.read(8).toLittleLong(), // weather s0
+                fis.read(8).toLittleLong(), // weather s1
+                fis.read(32),
+                fis.read(32),
+                fis.read(32),
+                fis.read(4).toLittleInt(), // player id
+                fis.read(8).toLittleLong(), // world TIME_T
+                fis.read(6).toLittleLong(), // creation time
+                fis.read(6).toLittleLong(), // last play time
+                fis.read(4).toLittleInt()  // total time wasted
+        )
+    }
+
+
+    internal data class SaveMetaData(
+            val worldName: String,
+            val terrainSeed: Long,
+            val rngS0: Long,
+            val rngS1: Long,
+            val weatherS0: Long,
+            val weatherS1: Long,
+            val worldinfo1Hash: ByteArray,
+            val worldInfo2Hash: ByteArray,
+            val worldInfo3Hash: ByteArray,
+            val playerID: Int,
+            val timeNow: Long,
+            val creationTime: Long,
+            val lastPlayTime: Long,
+            val totalPlayTime: Int
+    )
+}