Fix RequestHandlerGithub heuristics, so that Github Releases files work properly

.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="1.8" />
+  </component>
+</project>

.idea/packwiz-installer.iml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

README.md

@@ -1,2 +1,2 @@
 # packwiz-installer
-An installer for launching packwiz modpacks with MultiMC.
+An installer for launching packwiz modpacks with MultiMC. You'll need [the bootstrapper](https://github.com/comp500/packwiz-installer-bootstrap/releases) to actually use this.

src/main/java/link/infra/packwiz/installer/metadata/hash/Murmur2Lib.java

@@ -74,13 +74,13 @@ public class Murmur2Lib {
     int left = length - len_m;
     if (left != 0) {
       if (left >= 3) {
-        h ^= (int) data[length - 3] << 16;
+        h ^= (int) data[length - (left - 2)] << 16;
       }
       if (left >= 2) {
-        h ^= (int) data[length - 2] << 8;
+        h ^= (int) data[length - (left - 1)] << 8;
       }
       if (left >= 1) {
-        h ^= (int) data[length - 1];
+        h ^= data[length - left];
       }
 
       h *= M_32;
@@ -152,7 +152,7 @@ public class Murmur2Lib {
       case 2:
         h ^= (long) (data[tailStart + 1] & 0xff) << 8;
       case 1:
-        h ^= (long) (data[tailStart] & 0xff);
+        h ^= data[tailStart] & 0xff;
         h *= M_64;
     }
 

src/main/kotlin/link/infra/packwiz/installer/Main.kt

@@ -1,3 +1,5 @@
+@file:JvmName("Main")
+
 package link.infra.packwiz.installer
 
 import link.infra.packwiz.installer.metadata.SpaceSafeURI
@@ -84,6 +86,7 @@ class Main(args: Array<String>) {
 
 	companion object {
 		// Called by packwiz-installer-bootstrap to set up the help command
+		@JvmStatic
 		fun addNonBootstrapOptions(options: Options) {
 			options.addOption("s", "side", true, "Side to install mods from (client/server, defaults to client)")
 			options.addOption(null, "title", true, "Title of the installer window")
@@ -92,6 +95,7 @@ class Main(args: Array<String>) {
 		}
 
 		// TODO: link these somehow so they're only defined once?
+		@JvmStatic
 		private fun addBootstrapOptions(options: Options) {
 			options.addOption(null, "bootstrap-update-url", true, "Github API URL for checking for updates")
 			options.addOption(null, "bootstrap-update-token", true, "Github API Access Token, for private repositories")

src/main/kotlin/link/infra/packwiz/installer/UpdateManager.kt

@@ -126,7 +126,6 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 
 		ui.submitProgress(InstallProgress("Loading pack file..."))
 		val packFileSource = try {
-			Objects.requireNonNull(opts.downloadURI)
 			val src = getFileSource(opts.downloadURI!!)
 			getHasher("sha256").getHashingSource(src)
 		} catch (e: Exception) {
@@ -191,12 +190,16 @@ class UpdateManager internal constructor(private val opts: Options, val ui: IUse
 			handleCancellation()
 		}
 		try {
-			// This is badly written, I'll probably heavily refactor it at some point
-			// The port to Kotlin made this REALLY messy!!!!
-			getNewLoc(opts.downloadURI, Objects.requireNonNull(pf.index)!!.file)?.let {
-				pf.index!!.hashFormat?.let { it1 ->
-					processIndex(it,
-							getHash(Objects.requireNonNull(pf.index!!.hashFormat)!!, Objects.requireNonNull(pf.index!!.hash)!!), it1, manifest, invalidatedUris)
+			val index = pf.index!!
+			getNewLoc(opts.downloadURI, index.file)?.let { newLoc ->
+				index.hashFormat?.let { hashFormat ->
+					processIndex(
+						newLoc,
+						getHash(index.hashFormat!!, index.hash!!),
+						hashFormat,
+						manifest,
+						invalidatedUris
+					)
 				}
 			}
 		} catch (e1: Exception) {

src/main/kotlin/link/infra/packwiz/installer/metadata/hash/Murmur2Hasher.kt

@@ -10,7 +10,7 @@ class Murmur2Hasher : IHasher {
 		val tempBuffer = Buffer()
 
 		override val hash: Hash by lazy(LazyThreadSafetyMode.NONE) {
-			val data = computeNormalizedArray(internalBuffer.readByteArray())
+			val data = internalBuffer.readByteArray()
 			Murmur2Hash(Murmur2Lib.hash32(data, data.size, 1))
 		}
 
@@ -19,27 +19,42 @@ class Murmur2Hasher : IHasher {
 			val out = delegate.read(tempBuffer, byteCount)
 			if (out > -1) {
 				sink.write(tempBuffer.clone(), out)
-				internalBuffer.write(tempBuffer, out)
+				computeNormalizedBufferFaster(tempBuffer, internalBuffer)
 			}
 			return out
 		}
 
 		// Credit to https://github.com/modmuss50/CAV2/blob/master/murmur.go
-		private fun computeNormalizedArray(input: ByteArray): ByteArray {
-			val output = ByteArray(input.size)
+//		private fun computeNormalizedArray(input: ByteArray): ByteArray {
+//			val output = ByteArray(input.size)
+//			var index = 0
+//			for (b in input) {
+//				when (b) {
+//					9.toByte(), 10.toByte(), 13.toByte(), 32.toByte() -> {}
+//					else -> {
+//						output[index] = b
+//						index++
+//					}
+//				}
+//			}
+//			val outputTrimmed = ByteArray(index)
+//			System.arraycopy(output, 0, outputTrimmed, 0, index)
+//			return outputTrimmed
+//		}
+
+		private fun computeNormalizedBufferFaster(input: Buffer, output: Buffer) {
 			var index = 0
-			for (b in input) {
-				when (b.toInt()) {
-					9, 10, 13, 32 -> {}
+			val arr = input.readByteArray()
+			for (b in arr) {
+				when (b) {
+					9.toByte(), 10.toByte(), 13.toByte(), 32.toByte() -> {}
 					else -> {
-						output[index] = b
+						arr[index] = b
 						index++
 					}
 				}
 			}
-			val outputTrimmed = ByteArray(index)
-			System.arraycopy(output, 0, outputTrimmed, 0, index)
-			return outputTrimmed
+			output.write(arr, 0, index)
 		}
 
 	}

src/main/kotlin/link/infra/packwiz/installer/request/HandlerManager.kt

@@ -1,6 +1,7 @@
 package link.infra.packwiz.installer.request
 
 import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.handlers.RequestHandlerFile
 import link.infra.packwiz.installer.request.handlers.RequestHandlerGithub
 import link.infra.packwiz.installer.request.handlers.RequestHandlerHTTP
 import okio.Source
@@ -9,7 +10,8 @@ object HandlerManager {
 
 	private val handlers: List<IRequestHandler> = listOf(
 			RequestHandlerGithub(),
-			RequestHandlerHTTP()
+			RequestHandlerHTTP(),
+			RequestHandlerFile()
 	)
 
 	@JvmStatic

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerFile.kt

@@ -0,0 +1,18 @@
+package link.infra.packwiz.installer.request.handlers
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.IRequestHandler
+import okio.Source
+import okio.source
+import java.nio.file.Paths
+
+open class RequestHandlerFile : IRequestHandler {
+	override fun matchesHandler(loc: SpaceSafeURI): Boolean {
+		return "file" == loc.scheme
+	}
+
+	override fun getFileSource(loc: SpaceSafeURI): Source? {
+		val path = Paths.get(loc.toURL().toURI())
+		return path.source()
+	}
+}

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerGithub.kt

@@ -65,7 +65,7 @@ class RequestHandlerGithub : RequestHandlerZip(true) {
 		if (!("http" == scheme || "https" == scheme)) {
 			return false
 		}
-		return "github.com" == loc.host
-		// TODO: sanity checks, support for more github urls
+		// TODO: more match testing?
+		return "github.com" == loc.host && branchMatcherPattern.matcher(loc.path).matches()
 	}
 }