private static void Decode(Stream stream, ShpOffset[] offsets, int width, int height,
byte[][] frames, byte[] src, ref int recdepth)
{
if (recdepth > frames.Length)
{
throw new NotImplementedException("Format 40/20 frames contain infinite loop!");
}
for (uint i = 0; i < frames.Length; i++)
{
byte[] frame = new byte[width * height];
byte[] refframe = null;
ShpOffset curoff = offsets[i + 0];
ShpOffset nxtoff = offsets[i + 1];
int srclen = (int)(nxtoff.Offset - curoff.Offset);
stream.Read(src, 0, srclen);
switch (curoff.OffsetFormat)
{
// Format 20
case 0x20:
refframe = frames[i - 1];
goto do_format40;
// Format 40
case 0x40:
int j = Array.FindIndex(offsets, o => o.Offset == curoff.Ref);
if (j < 0)
{
throw new IndexOutOfRangeException("Invalid frame reference!");
}
refframe = frames[j];
do_format40:
if (refframe == null)
{
recdepth++;
Decode(stream, offsets, width, height, frames, src, ref recdepth);
recdepth--;
}
Format40.Decode(src, srclen, frame, refframe);
break;
// Format 80
case 0x80:
Format80.Decode(src, 0, frame, 0, srclen);
break;
// Invalid format
default:
throw new NotImplementedException("Invalid format!");
}
frames[i] = frame;
}
}
public static byte[] ReadAsBytes(Stream stream, out Palette palette)
{
CpsHeader header = stream.ReadStruct <CpsHeader>();
int src_size = header.file_size - Helpers.SizeOf <CpsHeader>() + 2;
if ((header.flags & FLAG_PALETTE) == FLAG_PALETTE)
{
palette = new Palette(stream, 2);
src_size -= 768;
}
else
{
palette = null;
}
byte[] src = stream.ReadBytes(src_size);
byte[] dst = new byte[header.image_size];
Format80.Decode(src, 0, dst, 0, src.Length);
return(dst);
}
private void UnpackSection(string section, byte[] buffer, int ofs, int len)
{
if (!config.Contains(section))
{
throw new Exception("[{0}] missing".F(section));
}
var sb = string.Join(string.Empty, config.Enumerate(section).Select(x => x.Value));
var bin = Convert.FromBase64String(sb);
using (var br = new BinaryReader(new MemoryStream(bin)))
{
var max = ofs + len;
while (ofs < max)
{
var cmpsz = br.ReadUInt16(); // compressed size
var ucmpsz = br.ReadUInt16(); // uncompressed size
var chunk = br.ReadBytes(cmpsz);
Format80.Decode(chunk, 0, buffer, ofs, cmpsz);
ofs += ucmpsz;
}
}
}