public static AppendContentBuilder FromString(string str)
{
var match = reg.Match(str);
if (!match.Success)
{
return(null);
}
var builder = new AppendContentBuilder();
if (match.Groups.Count == 2)
{
var captureCollection = match.Groups[1].Captures;
for (int i = 0; i < captureCollection.Count; i++)
{
var itemStr = captureCollection[i].Value;
var items = itemStr.Substring(1, itemStr.Length - 2).Split(new char[] { ',' });
var content = new AppendContent
{
X = int.Parse(items[0]),
Y = int.Parse(items[1]),
Color = int.Parse(items[2])
};
builder.Contents.Add(content);
}
}
return(builder);
}
public void modify(FileInfo file)
{
Bitmap bitmap = null;
AppendContent appendContent = null;
AppendContentBuilder builder = AppendContentBuilder.ParseFile(file) ?? new AppendContentBuilder();
try
{
using (var fs = file.OpenRead())
{
bitmap = new Bitmap(fs);
}
Random random = new Random((int)DateTime.Now.Ticks);
for (int i = 0; i < 2048 * 2048; i++)
{
var x = random.Next(bitmap.Width);
var y = random.Next(bitmap.Height);
var pixel = bitmap.GetPixel(x, y);
if (pixel.ToArgb() != Color.Transparent.ToArgb())
{
if (pixel.A > 125)
{
bitmap.SetPixel(x, y, Color.FromArgb(pixel.A - random.Next(1, 3), pixel));
}
else
{
bitmap.SetPixel(x, y, Color.FromArgb(pixel.A + random.Next(1, 3), pixel));
}
appendContent = new AppendContent {
X = x, Y = y, Color = pixel.ToArgb()
};
break;
}
}
bitmap.Save(file.FullName);
}
catch (Exception ex)
{
}
finally
{
if (bitmap != null)
{
bitmap.Dispose();
}
}
if (appendContent != null)
{
builder.Contents.Add(appendContent);
AppendContentBuilder.AddContent2File(file.FullName, builder.Contents);
}
//var png = new Png(file);
//png.AddInternationalText("comment", "hello " + DateTime.Now.Ticks);
//png.SaveFile();
}
public void recovery(FileInfo file)
{
Bitmap bitmap = null;
var filebuffer = File.ReadAllBytes(file.FullName);
var builder = AppendContentBuilder.ParseFile(filebuffer);
if (builder == null)
{
return;
}
bool success = false;
try
{
using (var fs = file.OpenRead())
{
bitmap = new Bitmap(fs);
}
foreach (var apcnt in builder.Contents)
{
bitmap.SetPixel(apcnt.X, apcnt.Y, Color.FromArgb(apcnt.Color));
}
bitmap.Save(file.FullName);
success = true;
}
catch (Exception ex)
{
}
finally
{
if (bitmap != null)
{
bitmap.Dispose();
}
}
if (success)
{
AppendContentBuilder.RemoveContentfromFile(file.FullName);
}
}
public static void AddContent2File(String file, ISet <AppendContent> contents)
{
var fileBuffer = File.ReadAllBytes(file);
var builder = ParseFile(fileBuffer);
if (builder == null)
{
builder = new AppendContentBuilder();
foreach (var content in contents)
{
builder.Contents.Add(content);
}
using (var fs = new FileStream(file, FileMode.Append, FileAccess.Write))
{
fs.Write(Encoding.ASCII.GetBytes(builder.ToString()), 0, builder.Length);
}
}
else
{
int oldlen = builder.Length;
foreach (var content in contents)
{
builder.Contents.Add(content);
}
var contentBuffer = Encoding.ASCII.GetBytes(builder.ToString());
var resultbuffer = new byte[fileBuffer.Length + builder.Length];
Array.Copy(fileBuffer, 0, resultbuffer, 0, fileBuffer.Length - oldlen);
Array.Copy(contentBuffer, 0, resultbuffer, fileBuffer.Length, contentBuffer.Length);
using (var fs = File.Create(file))
{
fs.Write(resultbuffer, 0, resultbuffer.Length);
}
}
}
