private void uiChunkList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
PngDataChunk currentChunk = uiChunkList.SelectedItem as PngDataChunk;
if (currentChunk != null)
{
switch (currentChunk.Type.ToString())
{
case "IHDR":
CtrlShowIHDR headerControl = new CtrlShowIHDR();
headerControl.HeaderData = currentChunk.ParsedData as ParsedIHDR;
headerControl.UpdateView();
tabChunkContents.Content = headerControl;
break;
case "gAMA":
CtrlShowGAMA gammaControl = new CtrlShowGAMA();
gammaControl.GammaData = currentChunk.ParsedData as ParsedGAMA;
gammaControl.UpdateView();
tabChunkContents.Content = gammaControl;
break;
case "tEXt":
CtrlShowTEXT textControl = new CtrlShowTEXT();
textControl.DataContext = currentChunk.ParsedData as ParsedTEXT;
tabChunkContents.Content = textControl;
break;
case "iTXt":
CtrlShowITXT itextControl = new CtrlShowITXT();
itextControl.DataContext = currentChunk.ParsedData as ParsedITXT;
tabChunkContents.Content = itextControl;
break;
case "tIME":
CtrlShowTIME timeControl = new CtrlShowTIME();
timeControl.DataContext = currentChunk.ParsedData as ParsedTIME;
tabChunkContents.Content = timeControl;
break;
default:
tabChunkContents.Content = new TextBlock {
Text = "Data cannot be displayed."
};
break;
}
tbRawHex.Text = SplitStringIntoLines(BitConverter.ToString(currentChunk.GetBytes()).Replace("-", " "), 24);
tbRawAscii.Text = SplitStringIntoLines(ByteUtils.ParseAscii(currentChunk.GetBytes()), 8);
btnDelete.IsEnabled = true;
}
else
{
btnDelete.IsEnabled = false;
}
}
/// <summary>
/// Returns whether this PngDataChunk is the same as another PngDataChunk, based on the CRC checksum.
/// </summary>
/// <param name="obj">object</param>
/// <returns>true if this == object, false otherwise</returns>
public override bool Equals(object obj)
{
PngDataChunk chunk = obj as PngDataChunk;
if (chunk == null)
{
return(false);
}
return(CalculateCrc() == chunk.CalculateCrc());
}
public static PngDataChunk NewItxtChunk(string keyword, bool compressed, string language, string translatedKeyword, string text)
{
ParsedITXT data = new ParsedITXT(keyword, compressed, language, translatedKeyword, text);
PngDataChunk chunk = new PngDataChunk(new ChunkType("iTXt"));
chunk.ParsedData = data;
chunk.UpdateData();
chunk.UpdateLength();
chunk.UpdateLength();
return(chunk);
}
public static PngDataChunk NewTextChunk(string keyword, string text)
{
ParsedTEXT data = new ParsedTEXT(keyword, text);
PngDataChunk chunk = new PngDataChunk(new ChunkType("tEXt"));
chunk.ParsedData = data;
chunk.UpdateData();
chunk.UpdateLength();
chunk.UpdateCrc();
return(chunk);
}
private void btnDelete_Click(object sender, RoutedEventArgs e)
{
PngDataChunk selectedChunk = uiChunkList.SelectedItem as PngDataChunk;
if (selectedChunk != null && selectedChunk.Type.Ancillary)
{
MessageBoxResult result = MessageBox.Show("Are you sure you want to permanently delete chunk " + selectedChunk.TypeString() + "?", "", MessageBoxButton.YesNo);
if (result == MessageBoxResult.Yes)
{
imageWrapper.FileChunks.Remove(selectedChunk);
uiChunkList.Items.Refresh();
}
}
else
{
MessageBox.Show("Cannot remove " + selectedChunk.TypeString() + ", as it is a critical chunk.");
}
}
public static List <PngDataChunk> GetChunks(byte[] imageBytes)
{
// Check for the eight-byte PNG signature
byte[] pngHeader = { 137, 80, 78, 71, 13, 10, 26, 10, };
for (int i = 0; i < 8; i++)
{
if (pngHeader[i] != imageBytes[i])
{
throw new ArgumentException("No PNG signature found");
}
}
List <PngDataChunk> chunks = new List <PngDataChunk>();
int k = 8;
while (true)
{
// get the data
UInt32 chunkLength = ByteUtils.ToUInt32(imageBytes, k);
k += 4;
ChunkType chunkType = new ChunkType(imageBytes, k);
k += 4;
byte[] chunkData = new byte[chunkLength];
for (int i = 0; i < chunkLength; i++, k++)
{
chunkData[i] = imageBytes[k];
}
UInt32 chunkCRC = ByteUtils.ToUInt32(imageBytes, k);
k += 4;
// create chunk from data and add it to list
PngDataChunk dataChunk = new PngDataChunk(chunkLength, chunkType, chunkData, chunkCRC);
chunks.Add(dataChunk);
// stop once we hit the IEND
if (chunkType.ToString() == "IEND")
{
break;
}
// TODO: proper error handling if IEND is never found
}
return(chunks);
}
