CSCE311 Project 3 -- Memory-Mapped File Manipulation

This project's goal is to work directly with memory-mapped files using mmap. The task was to implement a command-line tool that performs file operations entirely through memory mapping, and without an read/write system calls directly on the target file.

Source code file contents

All of the source code for the command line tool is written in src/main.cc. Its contents include:

• create() function: creates a new file at a given path with the size of a given number of bytes
• insert() function: inserts some bytes at a given offset in a file. if there is an error, it restores the original file
• append() function: appends some bytes to the end of a file
• main() function: executes the desired function based on the command line call

Usage

• Create: bin/mmap_util create <path> <fill_char> <size>
• Insert: bin/mmap_util insert <path> <offset> <bytes_incoming> < stdin
• Append: bin/mmap_util append <path> <bytes_incoming> < stdin

Example execution:

bin/mmap_util create dat/data.bin A 1024
echo -n "hello" | bin/mmap_util insert dat/data.bin 100 4
bin/mmap_util append dat/data.bin 1027 < dat/data_app.bin