private void Parse()
{
_r.Seek(0);
if (_r.PeekFor(() => _r.ReadWZStringBlock(true)) == "Property")
{
_encrypted = true;
}
else if (_r.PeekFor(() => _r.ReadWZStringBlock(false)) == "Property")
{
_encrypted = false;
}
else
{
WZUtil.Die("Failed to determine image encryption!");
}
_r.SkipWZStringBlock();
if (_r.ReadUInt16() != 0)
{
WZUtil.Die("WZImage with invalid header (no zero UInt16!)");
}
foreach (WZObject child in WZExtendedParser.ParsePropertyList(_r, this, this, _encrypted))
{
Add(child);
}
_parsed = true;
}
internal WZSubProperty(string name, WZObject parent, WZBinaryReader r, WZImage container)
: base(name, parent, default(WZNothing), container, true, WZObjectType.SubProperty)
{
foreach (WZObject c in WZExtendedParser.ParsePropertyList(r, this, Image, Image._encrypted))
{
Add(c);
}
}
internal WZConvexProperty(string name, WZObject parent, WZBinaryReader r, WZImage container)
: base(name, parent, default(WZNothing), container, true, WZObjectType.Convex)
{
int count = r.ReadWZInt();
for (int i = 0; i < count; ++i)
{
Add(WZExtendedParser.ParseExtendedProperty(i.ToString(CultureInfo.InvariantCulture), r, this, Image,
Image._encrypted));
}
}
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);
}
}
