/// <summary>
/// Gets the patch for limited visibility nodes for a file with specified path.
/// </summary>
/// <param name="path">File path.</param>
/// <returns>Patch structure.</returns>
private static Patch GetNodePatch(string path)
{
if (!File.Exists(path))
{
return(new Patch());
}
var t = new Text8(Encoding);
t.Load(path);
int i, offset = 0, n = t.Length;
Text8.Match m;
var replacements = new List <Text8.Replacement>();
bool isIdentity = false, isSound = false;
int soundOffset, endOffset;
while (offset < n)
{
i = t.FindSequence(SeqNode, offset);
if (i < 0)
{
break;
}
offset = i + NodeSequenceLength;
m = t.FindSeparator(offset);
if (m.Offset != offset)
{
break;
}
offset += m.Length;
m = t.FindNumber(offset);
if (m.Offset != offset)
{
break;
}
isIdentity = new ArraySegment <byte>(t, m.Offset, m.Length).SequenceEqual(SeqNone);
endOffset = t.FindSequence(SeqEnd, offset, 255);
if (endOffset > 0)
{
soundOffset = t.FindSequence(SeqSound, offset, endOffset - offset);
isSound = soundOffset > 0;
}
if (!isIdentity && !isSound)
{
replacements.Add(new Text8.Replacement {
Offset = m.Offset, Length = m.Length, Data = SeqNone
});
}
offset += m.Length;
}
if (replacements.Count < 1)
{
return(new Patch());
}
return(new Patch {
IsNotEmpty = true, Path = path, Replacements = replacements
});
}
/// <summary>
/// Applies a specified patch.
/// </summary>
/// <param name="patch"><see cref="Patch"/> structure containing path and a list of replacements to make.</param>
public static void ApplyPatch(Patch patch)
{
var file = new Text8();
var backupPath = patch.Path.Replace(TargetPath, BackupPath);
var backupDir = Path.GetDirectoryName(backupPath);
if (!Directory.Exists(backupDir))
{
Directory.CreateDirectory(backupDir);
}
file.Load(patch.Path);
file.Save(backupPath);
file.Replace(patch.Replacements);
file.Save(patch.Path);
}