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using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace com.clusterrr.Famicom.Containers
{
/// <summary>
/// File container for FDS games, disk sides collection
/// </summary>
public class FdsFile
{
IList<FdsDiskSide> sides;
/// <summary>
/// Disk Side Images
/// </summary>
public IList<FdsDiskSide> Sides { get => sides; set => sides = value ?? new List<FdsDiskSide>(); }
/// <summary>
/// Constructor to create empty FdsFile object
/// </summary>
public FdsFile()
{
sides = new List<FdsDiskSide>();
}
/// <summary>
/// Create FdsFile object from the specified .nes file
/// </summary>
/// <param name="filename">Path to the .fds file</param>
public FdsFile(string filename) : this(File.ReadAllBytes(filename))
{
}
/// <summary>
/// Create FdsFile object from raw .fds file data
/// </summary>
/// <param name="data"></param>
public FdsFile(byte[] data) : this()
{
if (data[0] == (byte)'F' && data[1] == (byte)'D' && data[2] == (byte)'S' && data[3] == 0x1A)
data = data.Skip(16).ToArray(); // skip header
if (data.Length % 65500 != 0) throw new InvalidDataException("Invalid FDS image: the size must be divisible by 65500");
for (int i = 0; i < data.Length; i += 65500)
{
var sideData = data.Skip(i).Take(66500).ToArray();
sides.Add(FdsDiskSide.FromBytes(sideData));
}
}
/// <summary>
/// Create FdsFile object from set of FdsDiskSide objects
/// </summary>
/// <param name="sides"></param>
public FdsFile(IEnumerable<FdsDiskSide> sides)
{
this.sides = new List<FdsDiskSide>(sides);
}
/// <summary>
/// Create FdsFile object from raw .fds file contents
/// </summary>
/// <param name="data"></param>
/// <returns>FdsFile object</returns>
public static FdsFile FromBytes(byte[] data) =>new FdsFile(data);
/// <summary>
/// Create FileFile object from the specified .nes file
/// </summary>
/// <param name="filename">Path to the .fds file</param>
/// <returns>FdsFile object</returns>
public static FdsFile FromFile(string filename) => new FdsFile(filename);
/// <summary>
/// Returns .fds file contents
/// </summary>
/// <param name="useHeader">Option to add .fds file header (ignored by most emulators)</param>
/// <returns>FDS file contents</returns>
public byte[] ToBytes(bool useHeader = false)
{
var data = sides.SelectMany(s => s.ToBytes());
if (useHeader)
{
var header = new byte[16];
header[0] = (byte)'F';
header[1] = (byte)'D';
header[2] = (byte)'S';
header[3] = 0x1A;
header[4] = (byte)sides.Count();
data = Enumerable.Concat(header, data);
}
return data.ToArray();
}
/// <summary>
/// Save as .fds file
/// </summary>
/// <param name="filename">Target filename</param>
/// <param name="useHeader">Option to add .fds file header (ignored by most emulators)</param>
public void Save(string filename, bool useHeader = false) => File.WriteAllBytes(filename, ToBytes(useHeader));
}
}
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