public static int DecodeInto(byte[] src, byte[] dest) {
VirtualFile ctx = new MemoryFile(src);
int destIndex = 0;
while (true) {
byte i = ctx.ReadByte();
if ((i & 0x80) == 0) {
// case 2
byte secondByte = ctx.ReadByte();
int count = ((i & 0x70) >> 4) + 3;
int rpos = ((i & 0xf) << 8) + secondByte;
ReplicatePrevious(dest, destIndex, destIndex - rpos, count);
destIndex += count;
}
else if ((i & 0x40) == 0) {
// case 1
int count = i & 0x3F;
if (count == 0)
return destIndex;
ctx.Read(dest, destIndex, count);
destIndex += count;
}
else {
int count3 = i & 0x3F;
if (count3 == 0x3E) {
// case 4
int count = ctx.ReadInt16();
byte color = ctx.ReadByte();
for (int end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = color;
}
else if (count3 == 0x3F) {
// case 5
int count = ctx.ReadInt16();
int srcIndex = ctx.ReadInt16();
if (srcIndex >= destIndex)
throw new NotImplementedException(string.Format("srcIndex >= destIndex {0} {1}", srcIndex, destIndex));
for (int end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = dest[srcIndex++];
}
else {
// case 3
int count = count3 + 3;
int srcIndex = ctx.ReadInt16();
if (srcIndex >= destIndex)
throw new NotImplementedException(string.Format("srcIndex >= destIndex {0} {1}", srcIndex, destIndex));
for (int end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] = dest[srcIndex++];
}
}
}
}
public static uint DecodeInto(byte[] src, byte[] dest) {
VirtualFile vfile = new MemoryFile(src);
uint i = 0;
while (vfile.CanRead) {
byte cmd = vfile.ReadByte();
if (cmd == 0) {
byte count = vfile.ReadUInt8();
while (count-- > 0)
dest[i++] = 0;
}
else
dest[i++] = cmd;
}
return i;
}
public static int DecodeInto(byte[] src, byte[] dest) {
var ctx = new MemoryFile(src);
int destIndex = 0;
while (true) {
byte i = ctx.ReadByte();
if ((i & 0x80) == 0) {
int count = i & 0x7F;
if (count == 0) {
// case 6
count = ctx.ReadByte();
byte value = ctx.ReadByte();
int end = destIndex + count;
for (; destIndex < end; destIndex++)
dest[destIndex] ^= value;
}
else {
// case 5
for (int end = destIndex + count; destIndex < end; destIndex++)
dest[destIndex] ^= ctx.ReadByte();
}
}
else {
int count = i & 0x7F;
if (count == 0) {
count = ctx.ReadInt16();
if (count == 0)
return destIndex;
if ((count & 0x8000) == 0) {
// case 2, skip
destIndex += (count & 0x7FFF);
}
else if ((count & 0x4000) == 0) {
// case 3
for (int end = destIndex + (count & 0x3FFF); destIndex < end; destIndex++)
dest[destIndex] ^= ctx.ReadByte();
}
else {
// case 4
byte value = ctx.ReadByte();
for (int end = destIndex + (count & 0x3FFF); destIndex < end; destIndex++)
dest[destIndex] ^= value;
}
}
else {
// case 1
destIndex += count;
}
}
}
}
public static byte[] Encode(byte[] src) {
/* quick & dirty format80 encoder -- only uses raw copy operator, terminated with a zero-run. */
/* this does not produce good compression, but it's valid format80 */
var ctx = new MemoryFile(src);
var ms = new MemoryStream();
do {
var len = Math.Min(ctx.Position, 0x3F);
ms.WriteByte((byte) (0x80 | len));
while (len-- > 0)
ms.WriteByte(ctx.ReadByte());
} while (!ctx.Eof);
ms.WriteByte(0x80); // terminator -- 0-length run.
return ms.ToArray();
}
/// <summary>Reads the tiles. </summary>
private void ReadTiles()
{
var mapSection = GetSection("IsoMapPack5");
byte[] lzoData = Convert.FromBase64String(mapSection.ConcatenatedValues());
int cells = (FullSize.Width * 2 - 1) * FullSize.Height;
int lzoPackSize = cells * 11 + 4; // last 4 bytes contains a lzo pack header saying no more data is left
var isoMapPack = new byte[lzoPackSize];
uint totalDecompressSize = Format5.DecodeInto(lzoData, isoMapPack);
var mf = new MemoryFile(isoMapPack);
int numtiles = 0;
for (int i = 0; i < cells; i++) {
ushort rx = mf.ReadUInt16();
ushort ry = mf.ReadUInt16();
short tilenum = mf.ReadInt16();
short zero1 = mf.ReadInt16();
byte subtile = mf.ReadByte();
byte z = mf.ReadByte();
byte zero2 = mf.ReadByte();
int dx = rx - ry + FullSize.Width - 1;
int dy = rx + ry - FullSize.Width - 1;
numtiles++;
if (dx >= 0 && dx < 2 * Tiles.Width &&
dy >= 0 && dy < 2 * Tiles.Height) {
var tile = new IsoTile((ushort)dx, (ushort)dy, rx, ry, z, tilenum, subtile);
Tiles[(ushort)dx, (ushort)dy / 2] = tile;
}
}
// fix missing tiles
// import tiles
for (ushort y = 0; y < FullSize.Height; y++) {
for (ushort x = 0; x <= FullSize.Width * 2 - 2; x++) {
var isoTile = Tiles[x, y];
if (isoTile == null) {
// fix null tiles to blank
ushort dx = (ushort)(x);
ushort dy = (ushort)(y * 2 + x % 2);
ushort rx = (ushort)((dx + dy) / 2 + 1);
ushort ry = (ushort)(dy - rx + FullSize.Width + 1);
Tiles[x, y] = new IsoTile(dx, dy, rx, ry, 0, 0, 0);
}
}
}
Logger.Debug("Read {0} tiles", numtiles);
}