/// <summary>
/// Creates a new chunk with the specified data (which must include the chunk type in
/// the first four bytes).
/// </summary>
/// <param name="data">The chunk data.</param>
/// <param name="image">The parent image.</param>
public Chunk(byte[] data, PNGImage image)
{
if (image == null)
{
throw new ArgumentNullException("The image must not be null.");
}
_image = image;
ByteStreamReader bs = new ByteStreamReader(data);
_type = Utils.ReadString(bs, 4);
this.AssertChunkType(_type);
if (!image.Classes.ContainsKey(_type))
{
_data = data;
}
}
public zTXtChunk(byte[] data, PNGImage image)
: base(data, image)
{
int i = 0;
while (data[i + 4] != 0)
{
i++;
}
this.Keyword = ASCIIEncoding.ASCII.GetString(data, 4, i);
this.CompressionMethod = (CompressionMethod)data[i + 5];
ByteStreamReader bs = new ByteStreamReader(data);
bs.Seek(i + 6, SeekOrigin.Begin);
InflaterInputStream iis = new InflaterInputStream(bs, new Inflater(), data.Length - 4 - i - 2);
StringBuilder sb = new StringBuilder();
while (iis.Available == 1)
{
int b = iis.ReadByte();
if (b == -1)
{
break;
}
sb.Append(System.Text.ASCIIEncoding.ASCII.GetChars(new byte[] { (byte)b })[0]);
}
this.Text = sb.ToString();
iis.Close();
bs.Close();
}
