Allow computing md5 hashes from hsStream derived classes

(cherry picked from commit e43cb685365bfc4498b681168bab0b1357ae208c)

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/PubUtilLib/plEncryption/plChecksum.cpp

@@ -90,31 +90,43 @@ plMD5Checksum::plMD5Checksum( const char *fileName )
 	CalcFromFile( fileName );
 }
 
+plMD5Checksum::plMD5Checksum( hsStream* stream )
+{
+	CalcFromStream(stream);
+}
+
 void plMD5Checksum::Clear()
 {
 	memset( fChecksum, 0, sizeof( fChecksum ) );
 	fValid = false;
 }
 
-void	plMD5Checksum::CalcFromFile( const char *fileName)
+void	plMD5Checksum::CalcFromFile( const char *fileName )
 {
-	FILE *fp;
+	hsUNIXStream s;
 	fValid = false;
 	
-	if( fp = fopen(fileName, "rb" ) )
+	if( s.Open(fileName) )
 	{
-		unsigned loadLen = 1024 * 1024;
-		Start();
+		CalcFromStream(&s);
+		s.Close();
+	}
+}
 
-		UInt8 *buf = TRACKED_NEW UInt8[loadLen];
+void plMD5Checksum::CalcFromStream( hsStream* stream )
+{
+	UInt32 sPos = stream->GetPosition();
+	unsigned loadLen = 1024 * 1024;
+	Start();
+
+	UInt8 *buf = TRACKED_NEW UInt8[loadLen];
 	
-		while(int read = fread(buf, sizeof(UInt8), loadLen, fp))
-			AddTo( read, buf );
-		delete[] buf;
+	while(int read = stream->Read(loadLen, buf))
+		AddTo( read, buf );
+	delete[] buf;
 
-		Finish();
-		fclose(fp);
-	}
+	Finish();
+	stream->SetPosition(sPos);
 }
 
 void	plMD5Checksum::Start( void )

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/PubUtilLib/plEncryption/plChecksum.h

@@ -58,6 +58,8 @@ public:
 	SumStorage GetChecksum() { return fSum; }
 };
 
+class hsStream;
+
 class plMD5Checksum 
 {
 	protected:
@@ -74,11 +76,13 @@ class plMD5Checksum
 		plMD5Checksum();
 		plMD5Checksum( const plMD5Checksum &rhs );
 		plMD5Checksum( const char *fileName );
+		plMD5Checksum( hsStream* stream );
 
 		hsBool	IsValid( void ) const { return fValid; }
 		void	Clear();
 
 		void	CalcFromFile( const char *fileName );
+ 		void	CalcFromStream( hsStream* stream );
 
 		void	Start( void );
 		void	AddTo( UInt32 size, const UInt8 *buffer );