private void ProcessExif(byte[] section)
{
int num1 = 6;
byte[] numArray1 = section;
int index1 = num1;
int num2 = index1 + 1;
if (numArray1[index1] != 0)
{
return;
}
byte[] numArray2 = section;
int index2 = num2;
int index3 = index2 + 1;
if (numArray2[index2] != 0)
{
return;
}
if (section[index3] == 73 && section[index3 + 1] == 73)
{
_isLittleEndian = true;
}
else
{
if (section[index3] != 77 || section[index3 + 1] != 77)
{
return;
}
_isLittleEndian = false;
}
int offset1 = index3 + 2;
int num3 = ExifIo.ReadUShort(section, offset1, _isLittleEndian);
int offset2 = offset1 + 2;
if (num3 != 42)
{
return;
}
int num4 = ExifIo.ReadInt(section, offset2, _isLittleEndian);
if ((num4 < 8 || num4 > 16) && (num4 < 16 || num4 > section.Length - 16))
{
return;
}
ProcessExifDir(section, num4 + 8, 8, section.Length - 8, 0, ExifIFD.Exif);
}
private void ProcessExifDir(byte[] section, int offsetDir, int offsetBase, int length, int depth, ExifIFD ifd)
{
if (depth > 4)
{
return;
}
ushort num1 = ExifIo.ReadUShort(section, offsetDir, _isLittleEndian);
if (offsetDir + 2 + 12 * num1 >= offsetDir + length)
{
return;
}
for (int num2 = 0; num2 < (int)num1; ++num2)
{
int sectionOffset = DirOffset(offsetDir, num2);
ExifTag exifTag = new ExifTag(section, sectionOffset, offsetBase, length, _isLittleEndian);
if (exifTag.IsValid)
{
switch (exifTag.Tag)
{
case 34665:
int offsetDir1 = offsetBase + exifTag.GetInt(0);
if (offsetDir1 <= offsetBase + length)
{
ProcessExifDir(section, offsetDir1, offsetBase, length, depth + 1, ExifIFD.Exif);
}
continue;
case 34853:
int offsetDir2 = offsetBase + exifTag.GetInt(0);
if (offsetDir2 <= offsetBase + length)
{
ProcessExifDir(section, offsetDir2, offsetBase, length, depth + 1, ExifIFD.Gps);
}
continue;
default:
exifTag.Populate(Info, ifd);
continue;
}
}
}
if (DirOffset(offsetDir, num1) + 4 <= offsetBase + length)
{
int num2 = ExifIo.ReadInt(section, offsetDir + 2 + 12 * num1, _isLittleEndian);
if (num2 > 0)
{
int offsetDir1 = offsetBase + num2;
if (offsetDir1 <= offsetBase + length && offsetDir1 >= offsetBase)
{
ProcessExifDir(section, offsetDir1, offsetBase, length, depth + 1, ifd);
}
}
}
if (Info.ThumbnailData != null || Info.ThumbnailOffset <= 0 || Info.ThumbnailSize <= 0)
{
return;
}
Info.ThumbnailData = new byte[Info.ThumbnailSize];
Array.Copy(section, offsetBase + Info.ThumbnailOffset, Info.ThumbnailData, 0, Info.ThumbnailSize);
}