From 2f9b8b2000b71650ff5a2b72dae3a5312e670465 Mon Sep 17 00:00:00 2001
From: Dan Engelbrecht <dan.engelbrecht@epicgames.com>
Date: Tue, 18 Nov 2025 16:34:17 +0100
Subject: loose chunk filtering bug when using wildcards (#654)

* fix filtering of loose chunks when downloading with a filter
add tests

* changelog

* move InlineRemoveUnusedHashes

* remove extra braces
---
 src/zencore/testutils.cpp | 43 +++++++++++++++++++++++++++++++------------
 1 file changed, 31 insertions(+), 12 deletions(-)

(limited to 'src/zencore/testutils.cpp')

diff --git a/src/zencore/testutils.cpp b/src/zencore/testutils.cpp
index 9f50de032..5bc2841ae 100644
--- a/src/zencore/testutils.cpp
+++ b/src/zencore/testutils.cpp
@@ -46,22 +46,41 @@ ScopedTemporaryDirectory::~ScopedTemporaryDirectory()
 IoBuffer
 CreateRandomBlob(uint64_t Size)
 {
-	static uint64_t Seed{0x7CEBF54E45B9F5D1};
-	auto			Next = [](uint64_t& seed) {
-		   uint64_t z = (seed += UINT64_C(0x9E3779B97F4A7C15));
-		   z		  = (z ^ (z >> 30)) * UINT64_C(0xBF58476D1CE4E5B9);
-		   z		  = (z ^ (z >> 27)) * UINT64_C(0x94D049BB133111EB);
-		   return z ^ (z >> 31);
-	};
+	static FastRandom Rand{.Seed = 0x7CEBF54E45B9F5D1};
+	return CreateRandomBlob(Rand, Size);
+};
+
+IoBuffer
+CreateSemiRandomBlob(uint64_t Size)
+{
+	IoBuffer	 Result(Size);
+	const size_t PartCount = (Size / (1u * 1024u * 64)) + 1;
+	const size_t PartSize  = Size / PartCount;
+	auto		 Part	   = CreateRandomBlob(PartSize);
+	auto		 Remain	   = Result.GetMutableView().CopyFrom(Part.GetView());
+	while (Remain.GetSize() >= PartSize)
+	{
+		Remain = Remain.CopyFrom(Part.GetView());
+	}
+	if (Remain.GetSize() > 0)
+	{
+		auto RemainBuffer = CreateRandomBlob(Remain.GetSize());
+		Remain.CopyFrom(RemainBuffer.GetView());
+	}
+	return Result;
+};
 
+IoBuffer
+CreateRandomBlob(FastRandom& Rand, uint64_t Size)
+{
 	IoBuffer  Data(Size);
 	uint64_t* DataPtr = reinterpret_cast<uint64_t*>(Data.MutableData());
 	while (Size > sizeof(uint64_t))
 	{
-		*DataPtr++ = Next(Seed);
+		*DataPtr++ = Rand.Next();
 		Size -= sizeof(uint64_t);
 	}
-	uint64_t ByteNext	 = Next(Seed);
+	uint64_t ByteNext	 = Rand.Next();
 	uint8_t* ByteDataPtr = reinterpret_cast<uint8_t*>(DataPtr);
 	while (Size > 0)
 	{
@@ -73,12 +92,12 @@ CreateRandomBlob(uint64_t Size)
 };
 
 IoBuffer
-CreateSemiRandomBlob(uint64_t Size)
+CreateSemiRandomBlob(FastRandom& Rand, uint64_t Size)
 {
 	IoBuffer	 Result(Size);
 	const size_t PartCount = (Size / (1u * 1024u * 64)) + 1;
 	const size_t PartSize  = Size / PartCount;
-	auto		 Part	   = CreateRandomBlob(PartSize);
+	auto		 Part	   = CreateRandomBlob(Rand, PartSize);
 	auto		 Remain	   = Result.GetMutableView().CopyFrom(Part.GetView());
 	while (Remain.GetSize() >= PartSize)
 	{
@@ -86,7 +105,7 @@ CreateSemiRandomBlob(uint64_t Size)
 	}
 	if (Remain.GetSize() > 0)
 	{
-		auto RemainBuffer = CreateRandomBlob(Remain.GetSize());
+		auto RemainBuffer = CreateRandomBlob(Rand, Remain.GetSize());
 		Remain.CopyFrom(RemainBuffer.GetView());
 	}
 	return Result;
-- 
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