From c0677b055bf0159d1ac31644c6ac14618154b934 Mon Sep 17 00:00:00 2001
From: kiritow <1362050620@qq.com>
Date: Tue, 6 Jun 2017 19:05:52 +0800
Subject: [PATCH] Add CRC32 calculating support.

---
 MiniEngine_Test.cpp | 36 +++++++++++++++++++++++++++++++++++-
 MiniEngine_Test.h   |  7 +++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/MiniEngine_Test.cpp b/MiniEngine_Test.cpp
index f95f1a5..471fbe0 100644
--- a/MiniEngine_Test.cpp
+++ b/MiniEngine_Test.cpp
@@ -31,6 +31,41 @@ std::string GetMD5(unsigned char* buffer,unsigned int bufferLen)
     return str;
 }
 
+/// Notice: SDLTest_crc32Calc is an undefined symbol. So we must use these 3 functions.
+int GetCRC32(unsigned char* buffer,unsigned int bufferLen,uint32_t& out_CRCResult)
+{
+    uint32_t result;
+    SDLTest_Crc32Context ct;
+    SDLTest_Crc32Init(&ct);
+
+    int ret=-2;
+    do
+    {
+        if (SDLTest_Crc32CalcStart(&ct,&result))
+        {
+            ret=-1;
+            break;
+        }
+        if (SDLTest_Crc32CalcBuffer(&ct, buffer, bufferLen, &result))
+        {
+            ret=-1;
+            break;
+        }
+        if (SDLTest_Crc32CalcEnd(&ct, &result))
+        {
+            ret=-1;
+            break;
+        }
+        ret=0;
+        out_CRCResult=result;
+        break;
+    }while(0);
+
+    SDLTest_Crc32Done(&ct);
+
+    return ret;
+}
+
 /// Compare two surfaces. Currently, Surface::getRawPointer() does not has constant attribute.
 int CompareSurface(Surface& surface1, Surface& surface2, int allowableError)
 {
@@ -60,7 +95,6 @@ uint32_t UniRandom::get()
     return SDLTest_Random(&(_sp.get()->context));
 }
 
-
 }/// End of namespace MiniEngine::Test
 
 }/// End of namespace MiniEngine
diff --git a/MiniEngine_Test.h b/MiniEngine_Test.h
index 2b71089..b05319b 100644
--- a/MiniEngine_Test.h
+++ b/MiniEngine_Test.h
@@ -10,6 +10,9 @@ namespace Test
 
 std::string GetMD5(unsigned char* buffer,unsigned int bufferLen);
 void GetMD5Raw(unsigned char* buffer,unsigned int bufferLen,unsigned char* outbuff);
+
+int GetCRC32(unsigned char* buffer,unsigned int bufferLen,uint32_t& out_CRCResult);
+
 int CompareSurface(const Surface& surface1,const Surface& surface2,int allowableError);
 
 class UniRandom
@@ -24,6 +27,10 @@ private:
     std::shared_ptr<_impl> _sp;
 };
 
+/// Not Implied : SDLTest_RandomAsciiString,SDLTest_RandomAsciiStringOfSize cause link error.
+std::string GetRandomString();
+std::string GetRandomString(size_t length);
+
 }/// End of namespace MiniEngine::Test
 
 }/// End of namespace MiniEngine