byte[] UnpackChannel(int channel)
{
var output = new byte[m_output.Length / 3];
var count_key = new ErpKey(m_info.Id ^ 0x68, DefaultKey[6, m_info.KeyIndex, m_info.Id]);
var pixel_key = new ErpKey(DefaultKey[channel, m_info.KeyIndex, m_info.Id],
DefaultKey[channel + 3, m_info.KeyIndex, m_info.Id]);
int dst = 0;
for (;;)
{
int px = m_input.ReadByte();
int count = m_input.ReadByte();
if (count < 0)
{
break;
}
count ^= count_key.Value ^ 0xE9;
if (0 == count)
{
break;
}
count = Math.Min(count, output.Length - dst);
byte v = (byte)(px ^ pixel_key.Value);
while (count-- > 0)
{
output[dst++] = v;
}
count_key.Increment();
pixel_key.Increment();
}
return(output);
}
void UnpackV0()
{
var count_key = new ErpKey(m_info.Id ^ 0x68, DefaultKey[6, m_info.KeyIndex, m_info.Id]);
var r_key = new ErpKey(DefaultKey[0, m_info.KeyIndex, m_info.Id],
DefaultKey[3, m_info.KeyIndex, m_info.Id]);
var g_key = new ErpKey(DefaultKey[1, m_info.KeyIndex, m_info.Id],
DefaultKey[4, m_info.KeyIndex, m_info.Id]);
var b_key = new ErpKey(DefaultKey[2, m_info.KeyIndex, m_info.Id],
DefaultKey[5, m_info.KeyIndex, m_info.Id]);
var rgb = new byte[3];
int dst = 0;
while (dst < m_output.Length)
{
m_input.Read(rgb, 0, 3);
int count = m_input.ReadByte();
if (count < 0)
{
break;
}
count ^= count_key.Value ^ 0xE9;
if (count > 0)
{
m_output[dst++] = (byte)(rgb[0] ^ b_key.Value);
m_output[dst++] = (byte)(rgb[1] ^ g_key.Value);
m_output[dst++] = (byte)(rgb[2] ^ r_key.Value);
count = Math.Min((count - 1) * 3, m_output.Length - dst);
if (count > 0)
{
Binary.CopyOverlapped(m_output, dst - 3, dst, count);
dst += count;
}
}
r_key.Increment();
g_key.Increment();
b_key.Increment();
count_key.Increment();
}
}
void UnpackV1()
{
var count_list = new List <int>();
var count_key = new ErpKey(m_info.Id ^ 0x68, DefaultKey[6, m_info.KeyIndex, m_info.Id]);
int count;
while ((count = m_input.ReadByte()) >= 0)
{
count ^= count_key.Value ^ 0xE9;
if (0 == count)
{
break;
}
count_list.Add(count);
count_key.Increment();
}
int order = m_info.Method - 1;
for (int i = 0; i < 3; ++i)
{
int channel = ChannelOrder[order, i];
var pixel_key = new ErpKey(DefaultKey[channel, m_info.KeyIndex, m_info.Id],
DefaultKey[channel + 3, m_info.KeyIndex, m_info.Id]);
int dst = 2 - channel;
for (int j = 0; j < count_list.Count; ++j)
{
count = count_list[j];
int px = m_input.ReadByte();
byte v = (byte)(px ^ pixel_key.Value);
while (count-- > 0)
{
m_output[dst] = v;
dst += 3;
}
pixel_key.Increment();
}
}
}
