public DateTime GetTime(TarHeader.HeaderField field)
{
string paxValue = GetPaxValue(field.PaxAttribute);
if (paxValue != null)
{
return(TarTime.FromPaxTime(paxValue));
}
long unixTime = GetOctalLong(field.WithoutPax);
if (unixTime < TarTime.MinUnixTime)
{
unixTime = TarTime.MinUnixTime;
}
else if (unixTime > TarTime.MaxUnixTime)
{
unixTime = TarTime.MaxUnixTime;
}
return(TarTime.FromUnixTime(unixTime, 0));
}
private static TarEntry ParseHeader(ref TarHeaderView header)
{
var entry = new TarEntry
{
Name = header.GetString(TarHeader.Name),
Mode = header.GetOctal(TarHeader.Mode),
UserID = header.GetOctal(TarHeader.UserID),
GroupID = header.GetOctal(TarHeader.GroupID),
Length = header.GetOctalLong(TarHeader.Length),
ModifiedTime = header.GetTime(TarHeader.ModifiedTime)
};
var checksum = header.GetOctal(TarHeader.Checksum);
int signedChecksum;
var unsignedChecksum = TarCommon.Checksum(header.Field(TarHeader.FullHeader), out signedChecksum);
if (checksum != signedChecksum && checksum != unsignedChecksum)
{
throw new TarParseException("invalid tar checksum");
}
var typeFlag = header[TarHeader.TypeFlag.Offset];
if (typeFlag == 0)
{
typeFlag = (byte)'0';
}
entry.Type = (TarEntryType)typeFlag;
entry.LinkTarget = header.GetString(TarHeader.LinkTarget);
var magic = header.GetString(TarHeader.FullMagic);
if (magic == TarCommon.PosixMagic || magic == TarCommon.GnuMagic)
{
entry.UserName = header.GetString(TarHeader.UserName);
entry.GroupName = header.GetString(TarHeader.GroupName);
entry.DeviceMajor = header.GetOctal(TarHeader.DeviceMajor);
entry.DeviceMinor = header.GetOctal(TarHeader.DeviceMinor);
if (magic == TarCommon.PosixMagic)
{
if (header.PaxAttributes == null || !header.PaxAttributes.ContainsKey(TarHeader.Name.PaxAttribute))
{
var prefix = header.GetString(TarHeader.Prefix);
if (prefix.Length > 0)
{
entry.Name = prefix + "/" + entry.Name;
}
}
string atime = header.GetPaxValue(TarCommon.PaxAtime);
if (atime != null)
{
entry.AccessTime = TarTime.FromPaxTime(atime);
}
string ctime = header.GetPaxValue(TarCommon.PaxCtime);
if (ctime != null)
{
entry.ChangeTime = TarTime.FromPaxTime(ctime);
}
string creationtime = header.GetPaxValue(TarCommon.PaxCreationTime);
if (creationtime != null)
{
entry.CreationTime = TarTime.FromPaxTime(creationtime);
}
string fileAttributes = header.GetPaxValue(TarCommon.PaxWindowsFileAttributes);
if (fileAttributes != null)
{
entry.FileAttributes = (FileAttributes)Convert.ToUInt32(fileAttributes);
}
entry.SecurityDescriptor = header.GetPaxValue(TarCommon.PaxWindowsSecurityDescriptor);
if (header.GetPaxValue(TarCommon.PaxWindowsMountPoint) != null)
{
entry.IsMountPoint = true;
}
}
}
return(entry);
}