Get rid of last map in FastJarHandler

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/FastJarHandler.kt

@@ -14,15 +14,15 @@ class FastJarHandler(val fileSystem: FastJarFileSystem, path: String) {
     private val myRoot: VirtualFile?
     internal val file = File(path)
 
-    private val ourEntryMap: Map<String, ZipEntryDescription>
     private val cachedManifest: ByteArray?
 
     init {
+        val entries: List<ZipEntryDescription>
         RandomAccessFile(file, "r").use { randomAccessFile ->
             val mappedByteBuffer = randomAccessFile.channel.map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length())
             try {
-                ourEntryMap = mappedByteBuffer.parseCentralDirectory().associateBy { it.relativePath }
-                cachedManifest = ourEntryMap[MANIFEST_PATH]?.let(mappedByteBuffer::contentsToByteArray)
+                entries = mappedByteBuffer.parseCentralDirectory()
+                cachedManifest = entries.singleOrNull { it.relativePath == MANIFEST_PATH }?.let(mappedByteBuffer::contentsToByteArray)
             } finally {
                 with(fileSystem) {
                     mappedByteBuffer.unmapBuffer()
@@ -30,12 +30,14 @@ class FastJarHandler(val fileSystem: FastJarFileSystem, path: String) {
             }
         }
 
-        myRoot = FastJarVirtualFile(this, "", -1, null)
+        myRoot = FastJarVirtualFile(this, "", -1, myParent = null, entryDescription = null)
 
-        val filesByRelativePath = HashMap<String, FastJarVirtualFile>(ourEntryMap.size)
+        // ByteArrayCharSequence should not be used instead of String
+        // because the former class does not support equals/hashCode properly
+        val filesByRelativePath = HashMap<String, FastJarVirtualFile>(entries.size)
         filesByRelativePath[""] = myRoot
 
-        for (entryDescription in ourEntryMap.values) {
+        for (entryDescription in entries) {
             if (!entryDescription.isDirectory) {
                 createFile(entryDescription, filesByRelativePath)
             } else {
@@ -59,7 +61,8 @@ class FastJarHandler(val fileSystem: FastJarFileSystem, path: String) {
         return FastJarVirtualFile(
             this, shortName,
             if (entry.isDirectory) -1 else entry.uncompressedSize,
-            parentFile
+            parentFile,
+            entry,
         )
     }
 
@@ -68,7 +71,7 @@ class FastJarHandler(val fileSystem: FastJarFileSystem, path: String) {
             val (parentPath, shortName) = entryName.splitPath()
             val parentFile = getOrCreateDirectory(parentPath, directories)
 
-            FastJarVirtualFile(this, shortName, -1, parentFile)
+            FastJarVirtualFile(this, shortName, -1, parentFile, entryDescription = null)
         }
     }
 
@@ -87,9 +90,9 @@ class FastJarHandler(val fileSystem: FastJarFileSystem, path: String) {
         return myRoot?.findFileByRelativePath(pathInJar)
     }
 
-    fun contentsToByteArray(relativePath: String): ByteArray {
+    fun contentsToByteArray(zipEntryDescription: ZipEntryDescription): ByteArray {
+        val relativePath = zipEntryDescription.relativePath
         if (relativePath == MANIFEST_PATH) return cachedManifest ?: throw FileNotFoundException("$file!/$relativePath")
-        val zipEntryDescription = ourEntryMap[relativePath] ?: throw FileNotFoundException("$file!/$relativePath")
         return fileSystem.cachedOpenFileHandles[file].use {
             synchronized(it) {
                 it.get().second.contentsToByteArray(zipEntryDescription)

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/FastJarVirtualFile.kt

@@ -4,7 +4,6 @@
  */
 package org.jetbrains.kotlin.cli.jvm.compiler.jarfs
 
-import com.intellij.openapi.util.Couple
 import com.intellij.openapi.util.io.BufferExposingByteArrayInputStream
 import com.intellij.openapi.util.io.FileUtil
 import com.intellij.openapi.vfs.VirtualFile
@@ -17,7 +16,8 @@ internal class FastJarVirtualFile(
     private val myHandler: FastJarHandler,
     private val myName: CharSequence,
     private val myLength: Int,
-    private val myParent: FastJarVirtualFile?
+    private val myParent: FastJarVirtualFile?,
+    private val entryDescription: ZipEntryDescription?,
 ) : VirtualFile() {
 
     private var myChildrenArray = EMPTY_ARRAY
@@ -85,10 +85,8 @@ internal class FastJarVirtualFile(
 
     @Throws(IOException::class)
     override fun contentsToByteArray(): ByteArray {
-        val pair: Couple<String> = FastJarFileSystem.splitPath(
-            path
-        )
-        return myHandler.contentsToByteArray(pair.second)
+        if (entryDescription == null) return EMPTY_BYTE_ARRAY
+        return myHandler.contentsToByteArray(entryDescription)
     }
 
     override fun getTimeStamp(): Long = 0
@@ -106,3 +104,5 @@ internal class FastJarVirtualFile(
         return 0
     }
 }
+
+private val EMPTY_BYTE_ARRAY = ByteArray(0)