CFileHelpers: Rework FileBuf handling

FileBuf: Reserve memory only when it is needed (copyFile)
copyFile: Reserve for small files, only as much memory as is required


Origin commit data
------------------
Branch: ni/coolstream
Commit: 0a1cdb3d4e
Author: Michael Liebmann <tuxcode.bbg@gmail.com>
Date: 2016-09-06 (Tue, 06 Sep 2016)



------------------
This commit was generated by Migit

src/system/helpers.cpp

@@ -675,8 +675,21 @@ CFileHelpers::CFileHelpers()
 
 CFileHelpers::~CFileHelpers()
 {
-	if (FileBuf != NULL)
+}
-		delete [] FileBuf;
+
+char* CFileHelpers::initFileBuf(char* buf, uint32_t size)
+{
+	if (buf == NULL)
+		buf = new char[size];
+	return buf;
+}
+
+char* CFileHelpers::deleteFileBuf(char* buf)
+{
+	if (buf != NULL)
+		delete [] buf;
+	buf = NULL;
+	return buf;
 }
 
 CFileHelpers* CFileHelpers::getInstance()

src/system/helpers.h

@@ -86,10 +86,11 @@ struct helpersDebugInfo {
 class CFileHelpers
 {
 	private:
-		unsigned long FileBufSize;
+		uint32_t FileBufMaxSize;
-		char *FileBuf;
 		int fd1, fd2;
 
+		char* initFileBuf(char* buf, uint32_t size);
+		char* deleteFileBuf(char* buf);
 		bool ConsoleQuiet;
 		helpersDebugInfo DebugInfo;
 		void setDebugInfo(const char* msg, const char* file, const char* func, int line);