private static bool HasZip64ExtendedInformationExtraField(CentralDirectoryHeader header)
{
IReadOnlyList <ExtraField> extraFields;
if (ExtraField.TryRead(header, out extraFields))
{
return(extraFields.Any(extraField => extraField is Zip64ExtendedInformationExtraField));
}
return(false);
}
private static bool TryRead(
byte[] extraFieldBytes,
ushort extraFieldLength,
bool readUncompressedFileSize,
bool readCompressedFileSize,
bool readRelativeOffsetOfLocalHeader,
bool readDiskNumberStart, out IReadOnlyList <ExtraField> extraFields)
{
var fields = new List <ExtraField>();
extraFields = fields;
using (var stream = new MemoryStream(extraFieldBytes))
using (var reader = new BinaryReader(stream))
{
while (stream.Position < stream.Length - 1)
{
var headerId = reader.ReadUInt16();
var dataSize = reader.ReadUInt16();
var data = reader.ReadBytes(dataSize);
ExtraField extraField;
if (headerId == 0x0001)
{
extraField = Zip64ExtendedInformationExtraField.Read(
headerId,
dataSize,
data,
readUncompressedFileSize,
readCompressedFileSize,
readRelativeOffsetOfLocalHeader,
readDiskNumberStart);
}
else
{
extraField = new ExtraField(headerId, dataSize, data);
}
fields.Add(extraField);
}
}
return(true);
}