private void Parse(WZBinaryReader wzbr, long offset)
{
wzbr.Seek(offset);
int entryCount = wzbr.ReadWZInt();
for (int i = 0; i < entryCount; ++i)
{
byte type = wzbr.ReadByte();
string name = null;
switch (type)
{
case 2:
int x = wzbr.ReadInt32();
wzbr.PeekFor(() => {
wzbr.Seek(x + File._fstart);
type = wzbr.ReadByte();
name = wzbr.ReadWZString(File._encrypted);
});
break;
case 3:
case 4:
name = wzbr.ReadWZString(File._encrypted);
break;
case 1:
// wzbr.Skip(10);
// continue;
default:
WZUtil.Die($"Unknown object type {type} in WzDirectory.");
break;
}
if (name == null)
{
WZUtil.Die("Failed to read WZDirectory entry name.");
}
int size = wzbr.ReadWZInt();
wzbr.ReadWZInt();
uint woffset = wzbr.ReadWZOffset(File._fstart);
switch (type)
{
case 3:
Add(new WZDirectory(name, this, File, wzbr.Clone(), woffset));
break;
case 4:
Add(new WZImage(name, this, File,
File.GetSubstream(woffset, size)));
break;
}
}
}
private void Parse(WZBinaryReader wzbr, long offset)
{
wzbr.Seek(offset);
int entryCount = wzbr.ReadWZInt();
for (int i = 0; i < entryCount; ++i) {
byte type = wzbr.ReadByte();
string name = null;
switch (type) {
case 2:
int x = wzbr.ReadInt32();
wzbr.PeekFor(() => {
wzbr.Seek(x + File._fstart);
type = wzbr.ReadByte();
name = wzbr.ReadWZString(File._encrypted);
});
break;
case 3:
case 4:
name = wzbr.ReadWZString(File._encrypted);
break;
case 1:
// wzbr.Skip(10);
// continue;
default:
WZUtil.Die($"Unknown object type {type} in WzDirectory.");
break;
}
if (name == null) {
WZUtil.Die("Failed to read WZDirectory entry name.");
}
int size = wzbr.ReadWZInt();
wzbr.ReadWZInt();
uint woffset = wzbr.ReadWZOffset(File._fstart);
switch (type) {
case 3:
Add(new WZDirectory(name, this, File, wzbr.Clone(), woffset));
break;
case 4:
Add(new WZImage(name, this, File,
File.GetSubstream(woffset, size)));
break;
}
}
}
internal override bool Parse(WZBinaryReader br, bool initial, out Bitmap result)
{
bool skip = (File._flag & WZReadSelection.NeverParseCanvas) == WZReadSelection.NeverParseCanvas,
eager = (File._flag & WZReadSelection.EagerParseCanvas) == WZReadSelection.EagerParseCanvas;
if (initial)
{
if (skip && eager)
{
result = null;
return(WZUtil.Die <bool>("Both NeverParseCanvas and EagerParseCanvas are set."));
}
br.Skip(1);
if (br.ReadByte() == 1)
{
br.Skip(2);
List <WZObject> l = WZExtendedParser.ParsePropertyList(br, this, Image, Image._encrypted);
if (ChildCount == 0)
{
l.ForEach(Add);
}
}
_afterChildren = br.Position;
}
else
{
br.Position = _afterChildren;
}
int width = br.ReadWZInt(); // width
int height = br.ReadWZInt(); // height
int format1 = br.ReadWZInt(); // format 1
int scale = br.ReadByte(); // format 2
br.Skip(4);
int blockLen = br.ReadInt32();
if ((initial || skip) && !eager)
{
br.Skip(blockLen); // block Len & png data
result = null;
return(skip);
}
else
{
br.Skip(1);
byte[] header = br.ReadBytes(2);
// FLG bit 5 indicates the presence of a preset dictionary
// seems like MS doesn't use that?
if ((header[1] & 0x20) != 0)
{
Debug.WriteLine("Warning; zlib with preset dictionary");
result = null;
br.Skip(blockLen - 3);
return(true);
}
// zlib header: CMF (byte), FLG (byte)
byte[] pngData = br.ReadBytes(blockLen - 3);
result = ParsePNG(width, height, format1, scale,
// CMF least significant bits 0 to 3 are compression method. only 8 is valid
(header[0] & 0xF) != 8 ||
// CMF << 8 | FLG i.e. header read as a big-endian short is a multiple of 31
(header[0] << 8 | header[1]) % 31 != 0
? DecryptPNG(pngData)
: pngData);
return(true);
}
}