/// <summary>
/// Fix data offsets. Values in packfile not always valid.
/// Ignores packfiles that are compressed AND condensed since those must
/// be fully extracted and data offsets aren't relevant in that case.
/// </summary>
private void FixEntryDataOffsets()
{
if (Header.Compressed && Header.Condensed)
{
return;
}
long runningDataOffset = 0; //Track relative offset from data section start
foreach (var entry in DirectoryEntries)
{
//Set entry offset
entry.DataOffset = runningDataOffset;
//Update offset based on entry size and storage type
if (Header.Compressed) //Compressed, not condensed
{
if (runningDataOffset + entry.CompressedDataSize > uint.MaxValue)
{
runningDataOffset += entry.CompressedDataSize;
}
else
{
runningDataOffset += entry.CompressedDataSize;
}
long alignmentPad = BinaryHelpers.GetAlignmentPad(runningDataOffset);
if (runningDataOffset + alignmentPad > uint.MaxValue)
{
runningDataOffset += alignmentPad;
}
else
{
runningDataOffset += alignmentPad;
}
}
else //Not compressed, maybe condensed
{
if (runningDataOffset + entry.DataSize > uint.MaxValue)
{
runningDataOffset += entry.DataSize;
}
else
{
runningDataOffset += entry.DataSize;
}
if (!Header.Condensed)
{
long alignmentPad = BinaryHelpers.GetAlignmentPad(runningDataOffset);
if (runningDataOffset + alignmentPad > uint.MaxValue)
{
runningDataOffset += BinaryHelpers.GetAlignmentPad(runningDataOffset);
}
else
{
runningDataOffset += BinaryHelpers.GetAlignmentPad(runningDataOffset);
}
}
}
}
}
