private static void PPMLineEncDealWith4Bytes(BinaryReader r, Flipnote._FrameData fd, int layer, int line, bool inv = false)
{
int y = 0;
if (inv)
{
for (int i = 0; i < 256; i++)
{
if (layer == 1)
{
fd.Layer1[line, i] = true;
}
else
{
fd.Layer2[line, i] = true;
}
}
}
byte b1 = r.ReadByte(),
b2 = r.ReadByte(),
b3 = r.ReadByte(),
b4 = r.ReadByte();
uint bytes = ((uint)(b1 << 24)) + ((uint)(b2 << 16)) + ((uint)(b3 << 8)) + b4;
while (bytes != 0)
{
if ((bytes & 0x80000000) != 0)
{
var pixels = r.ReadByte();
for (int i = 0; i < 8; i++)
{
if (layer == 1)
{
fd.Layer1[line, y++] = ((pixels >> i) & 1) == 1;
}
else
{
fd.Layer2[line, y++] = ((pixels >> i) & 1) == 1;
}
}
}
else
{
y += 8;
}
bytes <<= 1;
}
}
private static void PPMLineEncDealWithRawData(BinaryReader r, Flipnote._FrameData fd, int layer, int line)
{
int y = 0;
for (int i = 0; i < 32; i++)
{
byte val = r.ReadByte();
for (int b = 0; b < 8; b++)
{
if (layer == 1)
{
fd.Layer1[line, y++] = ((val >> b) & 1) == 1;
}
else
{
fd.Layer2[line, y++] = ((val >> b) & 1) == 1;
}
}
}
}
public static Flipnote._FrameData ReadPPMFrameData(this BinaryReader r, int cnt)
{
var fd = new Flipnote._FrameData();
fd.StreamPosition = r.BaseStream.Position;
try
{
fd.FirstByteHeader = r.ReadByte();
}
catch (EndOfStreamException)
{
if (fd.StreamPosition == 4288480943)
{
throw new Exception("Critical data corruption found. Are you trying a memory pit?");
}
else
{
throw new Exception("Flipnote file is broken");
}
}
if ((fd.FirstByteHeader & 0b01100000) != 0)
{
fd.TranslateX = r.ReadSByte();
fd.TranslateY = r.ReadSByte();
}
fd.Layer1LineEncoding = r.ReadBytes(48);
fd.Layer2LineEncoding = r.ReadBytes(48);
string enc1 = "";
for (int line = 0; line < 192; line++)
{
switch (fd.GetLineEncoding1(line))
{
case Flipnote.LineEncoding.SkipLine:
{
enc1 += "0";
break;
}
case Flipnote.LineEncoding.CodedLine:
{
enc1 += "1";
PPMLineEncDealWith4Bytes(r, fd, 1, line);
break;
}
case Flipnote.LineEncoding.InvertedCodedLine:
{
enc1 += "2";
PPMLineEncDealWith4Bytes(r, fd, 1, line, true);
break;
}
case Flipnote.LineEncoding.RawLineData:
{
enc1 += "3";
PPMLineEncDealWithRawData(r, fd, 1, line);
break;
}
}
}
for (int line = 0; line < 192; line++)
{
switch (fd.GetLineEncoding2(line))
{
case Flipnote.LineEncoding.SkipLine: break;
case Flipnote.LineEncoding.CodedLine:
{
PPMLineEncDealWith4Bytes(r, fd, 2, line);
break;
}
case Flipnote.LineEncoding.InvertedCodedLine:
{
PPMLineEncDealWith4Bytes(r, fd, 2, line, true);
break;
}
case Flipnote.LineEncoding.RawLineData:
{
PPMLineEncDealWithRawData(r, fd, 2, line);
break;
}
}
}
return(fd);
}
