public ShpD2Frame(Stream s)
{
var flags = (FormatFlags)s.ReadUInt16();
s.Position += 1;
var width = s.ReadUInt16();
var height = s.ReadUInt8();
Size = new Size(width, height);
// Subtract header size
var dataLeft = s.ReadUInt16() - 10;
var dataSize = s.ReadUInt16();
byte[] table;
if ((flags & FormatFlags.PaletteTable) != 0)
{
var n = (flags & FormatFlags.VariableLengthTable) != 0 ? s.ReadUInt8() : (byte)16;
table = new byte[n];
for (var i = 0; i < n; i++)
{
table[i] = s.ReadUInt8();
}
dataLeft -= n;
}
else
{
table = new byte[256];
for (var i = 0; i < 256; i++)
{
table[i] = (byte)i;
}
table[1] = 0x7f;
table[2] = 0x7e;
table[3] = 0x7d;
table[4] = 0x7c;
}
Data = new byte[width * height];
// Decode image data
var compressed = s.ReadBytes(dataLeft);
if ((flags & FormatFlags.SkipFormat80) == 0)
{
var temp = new byte[dataSize];
Format80.DecodeInto(compressed, temp);
compressed = temp;
}
Format2.DecodeInto(compressed, Data, 0);
// Lookup values in lookup table
for (var j = 0; j < Data.Length; j++)
{
Data[j] = table[Data[j]];
}
}
static MemoryStream ReadPackedSection(IniSection mapPackSection)
{
StringBuilder sb = new StringBuilder();
for (int i = 1; ; i++)
{
string line = mapPackSection.GetValue(i.ToString(), null);
if (line == null)
{
break;
}
sb.Append(line.Trim());
}
byte[] data = Convert.FromBase64String(sb.ToString());
List <byte[]> chunks = new List <byte[]>();
BinaryReader reader = new BinaryReader(new MemoryStream(data));
try
{
while (true)
{
uint length = reader.ReadUInt32() & 0xdfffffff;
byte[] dest = new byte[8192];
byte[] src = reader.ReadBytes((int)length);
/*int actualLength =*/
Format80.DecodeInto(src, dest);
chunks.Add(dest);
}
}
catch (EndOfStreamException) { }
MemoryStream ms = new MemoryStream();
foreach (byte[] chunk in chunks)
{
ms.Write(chunk, 0, chunk.Length);
}
ms.Position = 0;
return(ms);
}
void Decompress(ImageHeader h)
{
// No extra work is required for empty frames
if (h.Size.Width == 0 || h.Size.Height == 0)
{
return;
}
if (recurseDepth > imageCount)
{
throw new InvalidDataException("Format20/40 headers contain infinite loop");
}
switch (h.Format)
{
case Format.Format20:
case Format.Format40:
{
if (h.RefImage.Data == null)
{
++recurseDepth;
Decompress(h.RefImage);
--recurseDepth;
}
h.Data = CopyImageData(h.RefImage.Data);
Format40.DecodeInto(shpBytes, h.Data, (int)(h.FileOffset - shpBytesFileOffset));
break;
}
case Format.Format80:
{
var imageBytes = new byte[Size.Width * Size.Height];
Format80.DecodeInto(shpBytes, imageBytes, (int)(h.FileOffset - shpBytesFileOffset));
h.Data = imageBytes;
break;
}
default:
throw new InvalidDataException();
}
}
