private byte[] DecodeBlocks(JBLOCK[][][] coefficients, int length)
{
using (var ms = new MemoryStream())
{
for (var i = 0; i < length / BytesPerBlock + 1; i++)
{
var d = DecodeBlock(JpegHelper.GetBlock(coefficients, i));
ms.Write(d, 0, d.Length);
}
return(ms.GetBuffer().Take(length).ToArray());
}
}
private byte[] Decrypt(JBLOCK[][][] coefficients, int length)
{
var res = new byte[length];
for (var i = 0; i < length; i++)
{
for (var j = 0; j < 8; j++)
{
var block = JpegHelper.GetBlock(coefficients, i * 8 + j);
BitHelper.SetBit(ref res[i], j, DecryptShort(block[0]));
}
}
return(res);
}
private void Encrypt(JBLOCK[][][] coefficients, byte[] data)
{
var l = JpegHelper.GetLength(coefficients);
Console.Out.WriteLine($"Capacity = {l / 8}");
Console.Out.WriteLine("Used = {0}", data.Length);
for (var i = 0; i < data.Length; i++)
{
for (var j = 0; j < 8; j++)
{
var block = JpegHelper.GetBlock(coefficients, i * 8 + j);
block[0] = EncryptShort(block[0], BitHelper.GetBit(data[i], j));
}
}
}
private void EncodeBlocks(JBLOCK[][][] coefficients, byte[] data)
{
var l = JpegHelper.GetLength(coefficients);
Console.Out.WriteLine($"Capacity = {l * BytesPerBlock}");
EnforcePadding(data, BytesPerBlock);
Console.Out.WriteLine("Used = {0}", data.Length);
for (var i = 0; i < data.Length / BytesPerBlock; i++)
{
var block = JpegHelper.GetBlock(coefficients, i);
EncodeBlock(block, data.Skip(i * BytesPerBlock).Take(BytesPerBlock).ToArray());
if (i % 100 == 0)
{
Console.WriteLine($"{i} bytes encrypted");
}
}
}
