From 6cd3d84e746284d1e57248bbcc9d154985a94b32 Mon Sep 17 00:00:00 2001
From: "Denis.Zharkov" <denis.zharkov@jetbrains.com>
Date: Tue, 3 Aug 2021 17:58:38 +0300
Subject: [PATCH] Optimize parseCentralDirectory

Avoid creating redundant IntRange
---
 .../kotlin/cli/jvm/compiler/jarfs/ZipImplementation.kt      | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/ZipImplementation.kt b/compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/ZipImplementation.kt
index 8c91a8adc4d..decfb652d5d 100644
--- a/compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/ZipImplementation.kt
+++ b/compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/jarfs/ZipImplementation.kt
@@ -62,9 +62,11 @@ fun MappedByteBuffer.contentsToByteArray(
 fun MappedByteBuffer.parseCentralDirectory(): List<ZipEntryDescription> {
     order(ByteOrder.LITTLE_ENDIAN)
 
-    val endOfCentralDirectoryOffset = (capacity() - END_OF_CENTRAL_DIR_SIZE downTo 0).first { offset ->
+    var endOfCentralDirectoryOffset = capacity() - END_OF_CENTRAL_DIR_SIZE
+    while (endOfCentralDirectoryOffset >= 0) {
         // header of "End of central directory"
-        getInt(offset) == 0x06054b50
+        if (getInt(endOfCentralDirectoryOffset) == 0x06054b50) break
+        endOfCentralDirectoryOffset--
     }
 
     val entriesNumber = getUnsignedShort(endOfCentralDirectoryOffset + 10)