Check for potential write error (or not buffer full consumed)

include/uPDFParser.h

@@ -118,6 +118,7 @@ namespace uPDFParser
 	Name* parseName(std::string& token);
 
 	void repairTrailer();
+	void writeBuffer(int fd, const char* buffer, int size);
 	void writeUpdate(const std::string& filename);
 
 	int version_major, version_minor;

include/uPDFParser_common.h

@@ -22,7 +22,8 @@ namespace uPDFParser
 	INVALID_OBJECT,
 	INVALID_TRAILER,
 	INVALID_HEXASTRING,
-	NOT_IMPLEMENTED
+	NOT_IMPLEMENTED,
+	IO_ERROR
 	
     };