protected bool DetectWithWzImage(Wz_File wzFile, Wz_Image testWzImg)
{
while (wzFile.header.TryGetNextVersion())
{
uint offs = wzFile.CalcOffset(testWzImg.HashedOffsetPosition, testWzImg.HashedOffset);
if (offs < wzFile.header.DirEndPosition || offs + testWzImg.Size > wzFile.fileStream.Length) //img offset out of file size
{
continue;
}
wzFile.fileStream.Position = offs;
var firstByte = (byte)wzFile.fileStream.ReadByte();
if (!FastCheckFirstByte(testWzImg, firstByte))
{
continue;
}
testWzImg.Offset = offs;
if (!testWzImg.TryExtract())
{
continue;
}
testWzImg.Unextract();
wzFile.header.VersionChecked = true;
break;
}
return(wzFile.header.VersionChecked);
}
protected bool DetectWithAllWzDir(Wz_File wzFile)
{
while (wzFile.header.TryGetNextVersion())
{
bool isSuccess = wzFile.directories.All(testDir =>
{
uint offs = wzFile.CalcOffset(testDir.HashedOffsetPosition, testDir.HashedOffset);
if (offs < wzFile.header.DataStartPosition || offs + 1 > wzFile.header.DirEndPosition) // dir offset out of file size.
{
return(false);
}
wzFile.fileStream.Position = offs;
if (wzFile.fileStream.ReadByte() != 0) // for splitted wz format, dir data only contains one byte: 0x00
{
return(false);
}
return(true);
});
if (isSuccess)
{
wzFile.header.VersionChecked = true;
break;
}
}
return(wzFile.header.VersionChecked);
}
protected void CalcOffset(Wz_File wzFile, IEnumerable <Wz_Image> imgList)
{
foreach (var img in imgList)
{
img.Offset = wzFile.CalcOffset(img.HashedOffsetPosition, img.HashedOffset);
}
}
protected bool FastDetectWithAllWzImages(Wz_File wzFile, IList <Wz_Image> imgList)
{
var imageSizes = new SizeRange[imgList.Count];
while (wzFile.header.TryGetNextVersion())
{
int count = 0;
bool isSuccess = imgList.All(img =>
{
uint offs = wzFile.CalcOffset(img.HashedOffsetPosition, img.HashedOffset);
if (offs < wzFile.header.DirEndPosition || offs + img.Size > wzFile.fileStream.Length) //img offset out of file size
{
return(false);
}
imageSizes[count++] = new SizeRange()
{
Start = offs,
End = offs + img.Size,
};
return(true);
});
if (isSuccess)
{
// check if there's any image overlaps with another image.
Array.Sort(imageSizes, 0, count);
for (int i = 1; i < count; i++)
{
if (imageSizes[i - 1].End > imageSizes[i].Start)
{
isSuccess = false;
break;
}
}
if (isSuccess)
{
wzFile.header.VersionChecked = true;
break;
}
}
}
return(wzFile.header.VersionChecked);
}