// Some fields that have a reserved spot in the header, may not fit in such field anymore, but they can fit in the
// extended attributes. They get collected and saved in that dictionary, with no restrictions.
private void CollectExtendedAttributesFromStandardFieldsIfNeeded()
{
ExtendedAttributes.Add(PaxEaName, _name);
if (!ExtendedAttributes.ContainsKey(PaxEaMTime))
{
ExtendedAttributes.Add(PaxEaMTime, TarHelpers.GetTimestampStringFromDateTimeOffset(_mTime));
}
if (!string.IsNullOrEmpty(_gName))
{
TryAddStringField(ExtendedAttributes, PaxEaGName, _gName, FieldLengths.GName);
}
if (!string.IsNullOrEmpty(_uName))
{
TryAddStringField(ExtendedAttributes, PaxEaUName, _uName, FieldLengths.UName);
}
if (!string.IsNullOrEmpty(_linkName))
{
ExtendedAttributes.Add(PaxEaLinkName, _linkName);
}
if (_size > 99_999_999)
{
ExtendedAttributes.Add(PaxEaSize, _size.ToString());
}
// Checks if the extended attributes dictionary contains 'atime' and 'ctime'.
// If any of them is not found, it is added with the value of either the current entry's 'mtime',
// or 'DateTimeOffset.UtcNow', depending on the value of 'useMTime'.
private void AddNewAccessAndChangeTimestampsIfNotExist(bool useMTime)
{
Debug.Assert(!useMTime || (useMTime && _header._mTime != default));
bool containsATime = _header.ExtendedAttributes.ContainsKey(TarHeader.PaxEaATime);
bool containsCTime = _header.ExtendedAttributes.ContainsKey(TarHeader.PaxEaCTime);
if (!containsATime || !containsCTime)
{
string secondsFromEpochString = TarHelpers.GetTimestampStringFromDateTimeOffset(useMTime ? _header._mTime : DateTimeOffset.UtcNow);
if (!containsATime)
{
_header.ExtendedAttributes[TarHeader.PaxEaATime] = secondsFromEpochString;
}
if (!containsCTime)
{
_header.ExtendedAttributes[TarHeader.PaxEaCTime] = secondsFromEpochString;
}
}
}
/// <summary>
/// Initializes a new <see cref="PaxTarEntry"/> instance by converting the specified <paramref name="other"/> entry into the PAX format.
/// </summary>
public PaxTarEntry(TarEntry other)
: base(other, TarEntryFormat.Pax)
{
if (other._header._format is TarEntryFormat.Ustar or TarEntryFormat.Pax)
{
_header._prefix = other._header._prefix;
}
if (other is PaxTarEntry paxOther)
{
_header.InitializeExtendedAttributesWithExisting(paxOther.ExtendedAttributes);
}
else
{
if (other is GnuTarEntry gnuOther)
{
_header.ExtendedAttributes[TarHeader.PaxEaATime] = TarHelpers.GetTimestampStringFromDateTimeOffset(gnuOther.AccessTime);
_header.ExtendedAttributes[TarHeader.PaxEaCTime] = TarHelpers.GetTimestampStringFromDateTimeOffset(gnuOther.ChangeTime);
}
}
AddNewAccessAndChangeTimestampsIfNotExist(useMTime: false);
}
