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FS.cs
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FS.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace CrcAppender
{
/// <summary>
/// Functions to an embedded filesystem structure for RRF
/// </summary>
public static class FS
{
/// <summary>
/// Magic number that each FS image starts with
/// </summary>
private const uint Magic = 0x543C2BEF;
/// <summary>
/// Convert an filename e.g. from C:\SD\sys\foo.txt to /sys/foo.txt and return it as UTF-8 bytes
/// </summary>
/// <param name="filename">Filename to convert</param>
/// <param name="rootDirectory">Root directory</param>
/// <returns>Converted filename</returns>
private static byte[] ConvertFilename(string filename, string rootDirectory)
{
string result = filename.Substring(rootDirectory.EndsWith(Path.DirectorySeparatorChar) ? rootDirectory.Length : rootDirectory.Length + 1);
return Encoding.UTF8.GetBytes('/' + result.Replace(Path.DirectorySeparatorChar, '/'));
}
/// <summary>
/// Get all directories and sub-directories from the given directory
/// </summary>
/// <param name="directory">Directory to search in</param>
/// <returns>List of all sub-directories</returns>
private static List<string> GetDirectories(string directory)
{
List<string> result = new();
foreach (string subDirectory in Directory.EnumerateDirectories(directory))
{
result.Add(subDirectory);
result.AddRange(GetDirectories(subDirectory));
}
return result;
}
/// <summary>
/// Pseudo-class to hold all attributes
/// </summary>
private class FileEntry
{
/// <summary>
/// Dummy for an empty file entry
/// </summary>
public static readonly byte[] Empty = new byte[sizeof(uint) * 3];
/// <summary>
/// Constructor of this class
/// </summary>
/// <param name="filename">Filename</param>
/// <param name="length">Length in bytes</param>
public FileEntry(string filename)
{
Filename = filename;
}
/// <summary>
/// Filename
/// </summary>
public string Filename { get; }
/// <summary>
/// Offset of the filename
/// </summary>
public uint NameOffset { get; set; }
/// <summary>
/// Offset of the content
/// </summary>
public uint ContentOffset { get; set; }
/// <summary>
/// Length of the content
/// </summary>
public uint ContentLength { get; set; }
}
/// <summary>
/// Get all files from the given root directory and directories
/// </summary>
/// <param name="rootDirectory">Root directory</param>
/// <param name="directories">Directories</param>
/// <returns>List of file entries</returns>
private static List<FileEntry> GetFileEntries(string rootDirectory, IEnumerable<string> directories)
{
List<FileEntry> result = new();
foreach (string filename in Directory.GetFiles(rootDirectory))
{
result.Add(new(filename));
}
foreach (string directory in directories)
{
foreach (string filename in Directory.GetFiles(directory))
{
result.Add(new(filename));
}
}
return result;
}
/// <summary>
/// Build a FS image for RRF
/// </summary>
/// <param name="fsDirectory">Root directory of files and directories to embed</param>
/// <returns>Binary image stream</returns>
public static MemoryStream BuildImage(string fsDirectory)
{
// Retrieve all files and directories
List<string> directories = GetDirectories(fsDirectory);
List<FileEntry> files = GetFileEntries(fsDirectory, directories);
// Write the image
MemoryStream stream = new();
using (BinaryWriter writer = new(stream, Encoding.UTF8, true))
{
// Write header
writer.Write(Magic);
writer.Write((uint)0); // dummy for the directory offset
writer.Write((uint)files.Count);
// Write file entry dummies
uint filesPosition = writer.GetPosition();
for (int i = 0; i < files.Count; i++)
{
writer.Write(FileEntry.Empty);
}
// Rewrite directory offset
uint directoryPosition = writer.GetPosition();
writer.Seek(sizeof(uint), SeekOrigin.Begin);
writer.Write(directoryPosition);
writer.Seek(0, SeekOrigin.End);
// Write directories
foreach (string directory in directories)
{
Console.WriteLine("Embedding directory {0}", directory);
writer.Write(ConvertFilename(directory, fsDirectory));
writer.Write('\0');
}
writer.Write('\0');
// Write filenames
foreach (FileEntry file in files)
{
file.NameOffset = writer.GetPosition();
writer.Write(ConvertFilename(file.Filename, fsDirectory));
writer.Write('\0');
}
writer.WritePadding();
// Write file contents
foreach (FileEntry file in files)
{
writer.Flush();
file.ContentOffset = (uint)stream.Position;
using (Stream fs = GetFileStream(file.Filename))
{
Console.WriteLine("Embedding file {0} ({1} bytes @ {2})", file.Filename, fs.Length, file.ContentOffset);
file.ContentLength = (uint)fs.Length;
fs.CopyTo(stream);
}
writer.Write('\0');
writer.WritePadding();
}
// Write actual file table
writer.Seek((int)filesPosition, SeekOrigin.Begin);
foreach (FileEntry file in files)
{
writer.Write(file.NameOffset);
writer.Write(file.ContentOffset);
writer.Write(file.ContentLength);
}
}
return stream;
}
private static Stream GetFileStream(string filename)
{
// Strip comments and empty lines automatically from G-code files
if (filename.EndsWith(".g"))
{
MemoryStream strippedFile = new();
using (StreamWriter writer = new(strippedFile, leaveOpen: true))
{
using FileStream fs = new(filename, FileMode.Open, FileAccess.Read);
using StreamReader reader = new(fs);
while (true)
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
for (int i = line.Length - 1; i >= 0; i--)
{
// Stop when a double-quote is seen
if (line[i] == '"')
{
break;
}
if (line[i] == ';')
{
// Strip everything after the semicolon
line = line[..i].TrimEnd();
break;
}
}
// Write the line only if it isn't empty
if (!string.IsNullOrWhiteSpace(line))
{
writer.WriteLine(line);
}
}
}
strippedFile.Seek(0, SeekOrigin.Begin);
return strippedFile;
}
// Return just a direct reference to the file
return new FileStream(filename, FileMode.Open, FileAccess.Read);
}
/// <summary>
/// Extension method to get the current position
/// </summary>
/// <param name="writer">Binary writer</param>
/// <returns>Current position in the stream</returns>
private static uint GetPosition(this BinaryWriter writer)
{
writer.Flush();
return (uint)writer.BaseStream.Position;
}
/// <summary>
/// Extension method to fill up possible gaps in order to remain on a 4-byte boundary
/// </summary>
/// <param name="writer">Binary writer</param>
private static void WritePadding(this BinaryWriter writer)
{
int bytesToWrite = 4 - (int)writer.BaseStream.Position % 4;
if (bytesToWrite != 4)
{
for (int i = 0; i < bytesToWrite; i++)
{
writer.Write((byte)0);
}
}
}
}
}