bool SetTimestampsFromExtendedTimeStamp(IList <ExtraField> fields, UnixZipEntry entry)
{
if (fields == null || fields.Count == 0)
{
return(false);
}
DateTime modTime = DateTime.MinValue;
DateTime accTime = DateTime.MinValue;
DateTime createTime = DateTime.MinValue;
ForEachExtraField(fields, true, (ExtraField ef) => SetExtendedTimeStampTimes(new ExtraField_ExtendedTimestamp(ef), ref modTime, ref accTime, ref createTime));
// Central directory field only has the modification time, if at all
if (modTime == DateTime.MinValue)
{
ForEachExtraField(fields, false, (ExtraField ef) => SetExtendedTimeStampTimes(new ExtraField_ExtendedTimestamp(ef), ref modTime, ref accTime, ref createTime));
}
// We reset the entry modification time only if we got a valid value since
// that time is also set from the entry header in ZipEntry constructor - no
// need to invalidate that value if we don't have anything better.
if (modTime != DateTime.MinValue)
{
entry.ModificationTime = modTime;
}
// We don't care as much about the other times
entry.AccessTime = accTime;
entry.CreationTime = createTime;
return(true);
}
void SetIDS(IList <ExtraField> fields, UnixZipEntry entry, Func <ExtraField, ExtraField_UnixIDBase> fieldMaker)
{
if (fields == null || fields.Count == 0)
{
return;
}
if (fieldMaker == null)
{
throw new ArgumentNullException(nameof(fieldMaker));
}
ForEachExtraField(fields, true, (ExtraField ef) => {
var izef = fieldMaker(ef);
if (!izef.DataValid)
{
return;
}
if (!entry.UID.HasValue && izef.UID.HasValue)
{
entry.UID = izef.UID;
}
if (!entry.GID.HasValue && izef.GID.HasValue)
{
entry.GID = izef.GID;
}
});
}
bool SetTimestampsFromInfoZipUnixOriginal(IList <ExtraField> fields, UnixZipEntry entry)
{
if (fields == null || fields.Count == 0)
{
return(false);
}
DateTime modTime = DateTime.MinValue;
DateTime accTime = DateTime.MinValue;
ForEachExtraField(fields, true, (ExtraField ef) => {
var izef = new ExtraField_InfoZipUnixOriginal(ef);
SetOriginalUnixTimeStampTimes(izef, ref modTime, ref accTime);
if (izef.Length <= 4)
{
return; // No UID/GID
}
if (!entry.UID.HasValue && izef.UID.HasValue)
{
entry.UID = izef.UID;
}
if (!entry.GID.HasValue && izef.GID.HasValue)
{
entry.GID = izef.GID;
}
});
if (modTime == DateTime.MinValue)
{
ForEachExtraField(fields, false, (ExtraField ef) => SetOriginalUnixTimeStampTimes(new ExtraField_InfoZipUnixOriginal(ef), ref modTime, ref accTime));
}
if (modTime != DateTime.MinValue)
{
entry.ModificationTime = modTime;
}
// We ignore ID/GID here because it's less important than timestamps which may be set from other
// fields should this one lack any of them.
return(modTime != DateTime.MinValue || accTime != DateTime.MinValue);
}
FilePermissions GetUnixPermissions(UnixZipEntry entry)
{
uint xattr = (entry.ExternalAttributes >> 16) & 0xFFFF;
FilePermissions mode = 0;
var perms = (UnixExternalPermissions)(xattr & (uint)UnixExternalPermissions.IFMT);
switch (perms)
{
case 0:
case UnixExternalPermissions.IFREG:
entry.IsDirectory = false;
entry.IsSymlink = false;
break;
case UnixExternalPermissions.IFDIR:
entry.IsDirectory = true;
entry.IsSymlink = false;
break;
case UnixExternalPermissions.IFLNK:
entry.IsSymlink = true;
entry.IsDirectory = false;
break;
case UnixExternalPermissions.IFMT:
// Some broken zip archives appear to have 0xF in this field, which corresponds to IFMT
// We're going to assume it's a file
entry.IsDirectory = false;
entry.IsSymlink = false;
return(FilePermissions.DEFFILEMODE);
default:
// TODO: implement support for the rest of file types
// TODO: check what happens if zip with such files is unpacked on Windows
throw new NotSupportedException($"Unsupported Permission {perms}. Files other than regular ones, directories and symlinks aren't supported yet");
}
perms = (UnixExternalPermissions)(xattr & (uint)UnixExternalPermissions.IMODE);
if (perms.HasFlag(UnixExternalPermissions.IRUSR))
{
mode |= FilePermissions.S_IRUSR;
}
if (perms.HasFlag(UnixExternalPermissions.IRGRP))
{
mode |= FilePermissions.S_IRGRP;
}
if (perms.HasFlag(UnixExternalPermissions.IROTH))
{
mode |= FilePermissions.S_IROTH;
}
if (perms.HasFlag(UnixExternalPermissions.IWUSR))
{
mode |= FilePermissions.S_IWUSR;
}
if (perms.HasFlag(UnixExternalPermissions.IWGRP))
{
mode |= FilePermissions.S_IWGRP;
}
if (perms.HasFlag(UnixExternalPermissions.IWOTH))
{
mode |= FilePermissions.S_IWOTH;
}
if (perms.HasFlag(UnixExternalPermissions.IXUSR))
{
mode |= FilePermissions.S_IXUSR;
}
if (perms.HasFlag(UnixExternalPermissions.IXGRP))
{
mode |= FilePermissions.S_IXGRP;
}
if (perms.HasFlag(UnixExternalPermissions.IXOTH))
{
mode |= FilePermissions.S_IXOTH;
}
if (perms.HasFlag(UnixExternalPermissions.ISUID))
{
mode |= FilePermissions.S_ISUID;
}
if (perms.HasFlag(UnixExternalPermissions.ISGID))
{
mode |= FilePermissions.S_ISGID;
}
if (perms.HasFlag(UnixExternalPermissions.ISVTX))
{
mode |= FilePermissions.S_ISVTX;
}
return(mode);
}
void SetIDSFromInfoZipUnix3rdGeneration(IList <ExtraField> fields, UnixZipEntry entry)
{
SetIDS(fields, entry, (ExtraField ef) => new ExtraField_InfoZipUnix3rdGeneration(ef));
}
void SetIDSFromInfoZipUnixType2(IList <ExtraField> fields, UnixZipEntry entry)
{
SetIDS(fields, entry, (ExtraField ef) => new ExtraField_InfoZipUnixType2(ef));
}
