From 0c19f895d39b3302488acf9b6006fb524fb0e4d6 Mon Sep 17 00:00:00 2001
From: Pokechu22 <Pokechu022@gmail.com>
Date: Fri, 10 Dec 2021 13:34:40 -0800
Subject: Replace remaining uses of zlib crc32 with Common/Hash.h

---
 Source/Core/Common/Hash.cpp | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

(limited to 'Source/Core/Common/Hash.cpp')

diff --git a/Source/Core/Common/Hash.cpp b/Source/Core/Common/Hash.cpp
index 692745cb0a..62b56bc82c 100644
--- a/Source/Core/Common/Hash.cpp
+++ b/Source/Core/Common/Hash.cpp
@@ -534,11 +534,25 @@ void SetHash64Function()
 
 u32 ComputeCRC32(std::string_view data)
 {
-  const Bytef* buf = reinterpret_cast<const Bytef*>(data.data());
-  uInt len = static_cast<uInt>(data.size());
+  return ComputeCRC32(reinterpret_cast<const u8*>(data.data()), static_cast<u32>(data.size()));
+}
+
+u32 ComputeCRC32(const u8* ptr, u32 length)
+{
+  return UpdateCRC32(StartCRC32(), ptr, length);
+}
+
+u32 StartCRC32()
+{
+  return crc32(0L, Z_NULL, 0);
+}
+
+u32 UpdateCRC32(u32 crc, const u8* ptr, u32 length)
+{
+  static_assert(std::is_same_v<const u8*, const Bytef*>);
+  static_assert(std::is_same_v<u32, uInt>);
   // Use zlib's crc32 implementation to compute the hash
-  u32 hash = crc32(0L, Z_NULL, 0);
-  hash = crc32(hash, buf, len);
-  return hash;
+  // crc32_z (which takes a size_t) would be better, but it isn't available on Android
+  return crc32(crc, ptr, length);
 }
 }  // namespace Common
-- 
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