private void ProcessExifDir(byte[] section, int offsetDir, int offsetBase, int length, int depth, ExifIFD ifd)
{
if (depth > 4)
{
// corrupted Exif header...
return;
}
ushort numEntries = ExifIO.ReadUShort(section, offsetDir, littleEndian);
if (offsetDir + 2 + 12 * numEntries >= offsetDir + length)
{
// too long
return;
}
int offset = 0;
for (int de = 0; de < numEntries; ++de)
{
offset = DirOffset(offsetDir, de);
ExifTag exifTag = new ExifTag(section, offset, offsetBase, length, littleEndian);
if (!exifTag.IsValid)
{
continue;
}
switch (exifTag.Tag)
{
case (int)ExifIFD.Exif:
{
int dirStart = offsetBase + exifTag.GetInt(0);
if (dirStart <= offsetBase + length)
{
ProcessExifDir(section, dirStart, offsetBase, length, depth + 1, ExifIFD.Exif);
}
} break;
case (int)ExifIFD.Gps:
{
int dirStart = offsetBase + exifTag.GetInt(0);
if (dirStart <= offsetBase + length)
{
ProcessExifDir(section, dirStart, offsetBase, length, depth + 1, ExifIFD.Gps);
}
} break;
default:
{
exifTag.Populate(info, ifd);
} break;
}
}
// final link defined?
offset = DirOffset(offsetDir, numEntries) + 4;
if (offset <= offsetBase + length)
{
offset = ExifIO.ReadInt(section, offsetDir + 2 + 12 * numEntries, littleEndian);
if (offset > 0)
{
int subDirStart = offsetBase + offset;
if (subDirStart <= offsetBase + length && subDirStart >= offsetBase)
{
ProcessExifDir(section, subDirStart, offsetBase, length, depth + 1, ifd);
}
}
}
if (info.ThumbnailData == null && info.ThumbnailOffset > 0 && info.ThumbnailSize > 0)
{
// store it.
info.ThumbnailData = new byte[info.ThumbnailSize];
Array.Copy(section, offsetBase + info.ThumbnailOffset, info.ThumbnailData, 0, info.ThumbnailSize);
}
}
private void ProcessExifDir(byte[] section, int offsetDir, int offsetBase, int length, int depth, ExifIFD ifd)
{
if (depth > 4)
{
// corrupted Exif header...
return;
}
ushort numEntries = ExifIO.ReadUShort(section, offsetDir, littleEndian);
if (offsetDir + 2 + 12 * numEntries >= offsetDir + length)
{
// too long
return;
}
int offset = 0;
for (int de = 0; de < numEntries; ++de)
{
offset = DirOffset(offsetDir, de);
ExifTag exifTag = new ExifTag(section, offset, offsetBase, length, littleEndian);
if (!exifTag.IsValid)
continue;
switch (exifTag.Tag)
{
case (int)ExifIFD.Exif:
{
int dirStart = offsetBase + exifTag.GetInt(0);
if (dirStart <= offsetBase + length)
{
ProcessExifDir(section, dirStart, offsetBase, length, depth + 1, ExifIFD.Exif);
}
} break;
case (int)ExifIFD.Gps:
{
int dirStart = offsetBase + exifTag.GetInt(0);
if (dirStart <= offsetBase + length)
{
ProcessExifDir(section, dirStart, offsetBase, length, depth + 1, ExifIFD.Gps);
}
} break;
default:
{
exifTag.Populate(info, ifd);
} break;
}
}
// final link defined?
offset = DirOffset(offsetDir, numEntries) + 4;
if (offset <= offsetBase + length)
{
offset = ExifIO.ReadInt(section, offsetDir + 2 + 12 * numEntries, littleEndian);
if (offset > 0)
{
int subDirStart = offsetBase + offset;
if (subDirStart <= offsetBase + length && subDirStart >= offsetBase)
{
ProcessExifDir(section, subDirStart, offsetBase, length, depth + 1, ifd);
}
}
}
if (info.ThumbnailData == null && info.ThumbnailOffset > 0 && info.ThumbnailSize > 0)
{
// store it.
info.ThumbnailData = new byte[info.ThumbnailSize];
Array.Copy(section, offsetBase + info.ThumbnailOffset, info.ThumbnailData, 0, info.ThumbnailSize);
}
}
private void ProcessExifDir(byte[] section, int offsetDir, int offsetBase, int length, int depth, ExifIFD ifd, long sectionStart)
{
if (depth > 4)
{
return;
}
ushort num1 = ExifIO.ReadUShort(section, offsetDir, this.littleEndian);
if (offsetDir + 2 + 12 * (int)num1 >= offsetDir + length)
{
return;
}
for (int num2 = 0; num2 < (int)num1; ++num2)
{
int sectionOffset = this.DirOffset(offsetDir, num2);
ExifTag exifTag = new ExifTag(section, sectionOffset, offsetBase, length, this.littleEndian);
if (exifTag.IsValid)
{
switch (exifTag.Tag)
{
case 34665:
int offsetDir1 = offsetBase + exifTag.GetInt(0);
if (offsetDir1 <= offsetBase + length)
{
this.ProcessExifDir(section, offsetDir1, offsetBase, length, depth + 1, ExifIFD.Exif, sectionStart);
continue;
}
continue;
case 34853:
int offsetDir2 = offsetBase + exifTag.GetInt(0);
if (offsetDir2 <= offsetBase + length)
{
this.ProcessExifDir(section, offsetDir2, offsetBase, length, depth + 1, ExifIFD.Gps, sectionStart);
continue;
}
continue;
default:
exifTag.Populate(this.info, ifd, sectionStart);
continue;
}
}
}
if (this.DirOffset(offsetDir, (int)num1) + 4 <= offsetBase + length)
{
int num2 = ExifIO.ReadInt(section, offsetDir + 2 + 12 * (int)num1, this.littleEndian);
if (num2 > 0)
{
int offsetDir1 = offsetBase + num2;
if (offsetDir1 <= offsetBase + length && offsetDir1 >= offsetBase)
{
this.ProcessExifDir(section, offsetDir1, offsetBase, length, depth + 1, ifd, sectionStart);
}
}
}
if (this.info.ThumbnailData != null || this.info.ThumbnailOffset <= 0 || this.info.ThumbnailSize <= 0)
{
return;
}
this.info.ThumbnailData = new byte[this.info.ThumbnailSize];
Array.Copy((Array)section, offsetBase + this.info.ThumbnailOffset, (Array)this.info.ThumbnailData, 0, this.info.ThumbnailSize);
}