Description
In this workshop, you encrypted a text file of characters while backing it up to a binary file,
decrypt the characters while restoring the encrypted data from the binary file and add multithreading to your solution.
LEARNING OUTCOMES
Upon successful completion of this workshop, you will have demonstrated the abilities to
• Process partitioned data on two or more threads
• Write a set of characters to a file in binary mode
• Read a set of characters from a file in binary mode
• Bind a function to its arguments
SUBMISSION POLICY
The in-lab section is to be completed during your assigned lab section. It is to be completed
and submitted by the end of the workshop period. If you attend the lab period and cannot
complete the in-lab portion of the workshop during that period, ask your instructor for
permission to complete the in-lab portion after the period. If you do not attend the workshop,
you can submit the in-lab section along with your at-home section (see penalties below). The
at-home portion of the lab is due on the day that is four days after your scheduled in-lab
workshop (23:59:59) (even if that day is a holiday).
All your work (all the files you create or modify) must contain your name, Seneca email and
student number.
You are responsible to back up your work regularly.
Late Submission Penalties:
• In-lab portion submitted late, with at-home portion: 0 for in-lab. Maximum of 7/10 for the
entire workshop.
• If any of in-lab, at-home or reflection portions is missing, the mark for the workshop will be
0/10.
SPECIFICATIONS – IN LAB
The modules that constitute this workshop are listed below along with their file names
1. SecureData module:
SecureData.h (supplied)
SecureData.cpp (incomplete)
2. Main module: w8.cpp (supplied)
The data file supplied with this workshop is: text.dat
Compound types are types that a programmer constructs from a language’s
fundamental types and/or other compound types. In C++11, compound types
include pointers and references to existing types, enumerations of named
constant values, arrays of objects of an existing type, classes and function
types. C++11 clarified the difference between lvalues and rvalues and
references to each, which helped simplify many of the facilities available
in the standard library.
This chapter describes the non-function types in detail. The description
includes a review of one-dimensional arrays in both static and dynamic memory
and shows how to allocate multi-dimensional arrays in both static and dynamic
memory. The description of classes reviews class definitions, introduces
move-constructors and move-assignment operators and includes declarations of
special members such as bit fields, class variables and class functions.
The output from your executable running Visual Studio with the following command line
argument should look like
Command Line : C:\Users\…\Debug\in_lab.exe text.dat encoded.dat C
921 bytes copied from file text.dat into memory (null byte added)
Data encrypted in memory
922 bytes copied from binary file encoded.dat into memory.
Data decrypted in memory
Compound types are types that a programmer constructs from a language’s
fundamental types and/or other compound types. In C++11, compound types
include pointers and references to existing types, enumerations of named
constant values, arrays of objects of an existing type, classes and function
types. C++11 clarified the difference between lvalues and rvalues and
references to each, which helped simplify many of the facilities available
in the standard library.
This chapter describes the non-function types in detail. The description
includes a review of one-dimensional arrays in both static and dynamic memory
and shows how to allocate multi-dimensional arrays in both static and dynamic
memory. The description of classes reviews class definitions, introduces
move-constructors and move-assignment operators and includes declarations of
special members such as bit fields, class variables and class functions.
The last command line argument (C) is the key to be used in the encryption and decryption.
Your Tasks
Your tasks for this part of the workshop are to implement the functionality for the SecureData
module:
1. Complete the definition of the SecureData::backup member function
2. Complete the definition of the SecureData::restore member function
In-Lab Submission (30%)
To test and demonstrate execution of your program use the same data as shown in the output
example above.
Upload your source code to your matrix account. Compile and run your code using the latest
version of the gcc compiler and make sure that everything works properly.
Then, run the following command from your account: (replace profname.proflastname
with your professor’s Seneca userid)
~profname.proflastname/submit 345XXX_w9_lab
and follow the instructions. Replace XXX with the section letter(s) specified by your instructor.
SPECIFICATIONS – AT HOME
In this part of the workshop you implement multi-threading in the SecureData::code(char key)
member function.
Reflection
Study your final solution, reread the related parts of the course notes, and make sure that you
have understood the concepts covered by this workshop. Take your time. Explain in your own
words what you have learned in completing this workshop. Include in your explanation but do
not limit it to the following points (40%):
• Binary file operations
• Binding a function to its arguments
• Multi-threading
To avoid deductions, refer to code in your solution as examples to support your explanations.
Include all corrections to the Quiz(zes) you have received (30%).
At-Home Submission (70%)
To test and demonstrate execution of your program use the same data as shown in the output
example above.
Upload your source code to your matrix account. Compile and run your code using the latest
version of the gcc compiler and make sure that everything works properly.
Then, run the following command from your account: (replace profname.proflastname
with your professor’s Seneca userid)
~profname.proflastname/submit 345XXX_w9_home
and follow the instructions. Replace XXX with the section letter(s) specified by your instructor.
