PackageFile.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Security.Cryptography;

namespace SimplePackager.Core {
    public class PackageFile {

        public PackageFile() {
            Directories = new List<PackageEntryDirectory>();
            Directories.Add(new PackageEntryDirectory() { Name = "/" });

            Files = new List<PackageEntryFile>();
        }

        private string ComputeHash(byte[] data) {
            return Convert.ToBase64String(SHA1.Create().ComputeHash(data));
        }

        /// <summary>
        /// Directories
        /// </summary>
        public List<PackageEntryDirectory> Directories { get; set; }

        /// <summary>
        /// Files
        /// </summary>
        public List<PackageEntryFile> Files { get; set; }

        public void CreateDirectory(string name) {
            if (Directories.First(d => d.Name == name) == null) {
                Directories.Add(new PackageEntryDirectory() { Name = name });
            }
            else{
                throw new Exception("Directory " + name + " already exists!");
            }
        }

        public void DeleteDirectory(string name) {
            name = name.Replace("/", "\\");

            if (name.Equals(@"\")) {
                throw new AccessViolationException("Root directory cannot be removed!");
            }
            else {
                var dir = Directories.First(d => d.Name == name);
                if (dir != null) {
                    Directories.Remove(dir);
                }
            }
        }

        public void AllocateFile(string name, string path, long size) {
            var file = Files.First(f => f.Name == name);
            byte[] data = null;

            if (file == null) {
                Trace.WriteLine("Cannot allocate File " + name + ", because already exists!");
                throw new Exception("File " + name + " already exists!");
            }
            else {
                data = new byte[size];
                Files.Add(new PackageEntryFile() { Name = name, Size = data.Length, Data = Convert.ToBase64String(data), Directory = path, Hash = ComputeHash(data) });
                Trace.WriteLine("File " + name + " successful allocated byte[" + data.Length + "]!");
            }
        }

        public void ImportFile(string name, byte[] data, string directory = "/") {

        }
    }

    public class PackageEntryDirectory {

        /// <summary>
        /// Directory Name
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// Directory with this flag cannot be modifyed (you can't edit, allocate, import, delete any) just export files inside them.
        /// </summary>
        public bool IsLocked { get; set; }
    }

    public class PackageEntryFile {

        /// <summary>
        /// File Name
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// File Size
        /// </summary>
        public long Size { get; set; }

        /// <summary>
        /// File Path
        /// </summary>
        public string Directory { get; set; }

        /// <summary>
        /// Base64 Encoded Bytes
        /// </summary>
        public string Data { get; set; }

        /// <summary>
        /// Base64 Encoded Bytes From Hash (SHA1)
        /// </summary>
        public string Hash { get; set; }
    }
}