Fix JS5 uncompression of large GZIP-compressed files

Signed-off-by: Graham <gpe@openrs2.dev>

cache/src/main/java/dev/openrs2/cache/Js5Compression.kt

@@ -7,6 +7,7 @@ import dev.openrs2.crypto.xteaEncrypt
 import io.netty.buffer.ByteBuf
 import io.netty.buffer.ByteBufInputStream
 import io.netty.buffer.ByteBufOutputStream
+import java.io.EOFException
 
 public object Js5Compression {
     public fun compress(input: ByteBuf, type: Js5CompressionType, key: XteaKey = XteaKey.ZERO): ByteBuf {
@@ -102,7 +103,14 @@ public object Js5Compression {
 
             plaintext.alloc().buffer(uncompressedLen, uncompressedLen).use { output ->
                 type.createInputStream(ByteBufInputStream(plaintext, len), uncompressedLen).use { inputStream ->
-                    output.writeBytes(inputStream, uncompressedLen)
+                    var remaining = uncompressedLen
+                    while (remaining > 0) {
+                        val n = output.writeBytes(inputStream, remaining)
+                        if (n == -1) {
+                            throw EOFException()
+                        }
+                        remaining -= n
+                    }
                 }
 
                 return output.retain()

cache/src/test/java/dev/openrs2/cache/Js5CompressionTest.kt

@@ -55,6 +55,17 @@ object Js5CompressionTest {
         }
     }
 
+    @Test
+    fun testUncompressLargeGzip() {
+        read("gzip-large.dat").use { input ->
+            Js5Compression.uncompress(input).use { actual ->
+                read("large.dat").use { expected ->
+                    assertEquals(expected, actual)
+                }
+            }
+        }
+    }
+
     @Test
     fun testCompressBzip2() {
         Unpooled.wrappedBuffer("OpenRS2".toByteArray()).use { expected ->