public IList <ExtraField> GetExtraField(ushort fieldID, ZipHeaderLocation location = ZipHeaderLocation.Any, bool required = false)
{
OperationFlags flags = OperationFlags.None;
if (!TranslateLocation(location, out flags))
{
return(null);
}
var ret = new List <ExtraField> ();
if (flags == OperationFlags.None)
{
GatherExtraFields(GetFieldCount(fieldID, location, OperationFlags.Local), fieldID, OperationFlags.Local, ret, required);
if (location == ZipHeaderLocation.Any && ret.Count > 0)
{
return(ret);
}
GatherExtraFields(GetFieldCount(fieldID, location, OperationFlags.Central), fieldID, OperationFlags.Central, ret, required);
}
else
{
GatherExtraFields(GetFieldCount(fieldID, location, flags), fieldID, flags, ret, required);
}
return(ret.Count > 0 ? ret : null);
}
bool TranslateLocation(ZipHeaderLocation location, out OperationFlags flags)
{
flags = OperationFlags.None;
switch (location)
{
case ZipHeaderLocation.Both:
case ZipHeaderLocation.Any:
if (localExtraFieldsCount <= 0 && centralExtraFieldsCount <= 0)
{
return(false);
}
// Don't set any flags here, native api errors out if it has both central and local flags set
break;
case ZipHeaderLocation.Central:
if (centralExtraFieldsCount <= 0)
{
return(false);
}
flags = OperationFlags.Central;
break;
case ZipHeaderLocation.Local:
if (localExtraFieldsCount <= 0)
{
return(false);
}
flags = OperationFlags.Local;
break;
}
return(true);
}
ushort GetFieldCount(ushort fieldID, ZipHeaderLocation location, OperationFlags flags)
{
short count = Native.zip_file_extra_fields_count_by_id(archive.ArchivePointer, Index, fieldID, flags);
if (count < 0)
{
count = 0;
}
return((ushort)count);
}
public bool ExtraFieldPresent(ushort fieldID, ZipHeaderLocation location = ZipHeaderLocation.Any)
{
OperationFlags flags = OperationFlags.None;
if (!TranslateLocation(location, out flags))
{
return(false);
}
if (flags != OperationFlags.Central && GetFieldCount(fieldID, location, OperationFlags.Local) > 0)
{
return(true);
}
return(GetFieldCount(fieldID, location, OperationFlags.Central) > 0);
}
