private static DateTime ReadLastModifiedTime(Core.Utility.BinaryReader reader, ref int bytesRead)
{
var lastModifiedTime = DateTime.MinValue;
var modifiedTimeUnixUtc = reader.ReadUInt32();
if (modifiedTimeUnixUtc != 0)
{
var epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
lastModifiedTime = epoch.AddSeconds(modifiedTimeUnixUtc);
}
bytesRead += sizeof(uint);
return(lastModifiedTime);
}
private static long FindNextEntry(Core.Utility.BinaryReader reader, GZipMemberEntry currentEntry)
{
var foundMagic = false;
var positionOfNextEntry = -1L;
try
{
var magic = reader.ReadByte();
while (true)
{
if (magic == MagicIdentifier[0])
{
magic = reader.ReadByte();
if (magic == MagicIdentifier[1])
{
foundMagic = true;
break;
}
}
else
{
magic = reader.ReadByte();
}
}
}
catch (EndOfStreamException)
{
positionOfNextEntry = reader.BaseStream.Length;
}
catch (IOException)
{
}
if (foundMagic || (positionOfNextEntry == reader.BaseStream.Length))
{
// go back 4 (CRC32) + 4 (size mod 2^32) [+ 2 (magic)]
var offset = sizeof(uint) + sizeof(int);
var origin = SeekOrigin.End;
if (foundMagic)
{
offset += MagicIdentifier.Length;
origin = SeekOrigin.Current;
}
reader.BaseStream.Seek(-offset, origin);
currentEntry.Crc32 = reader.ReadUInt32();
currentEntry._length = reader.ReadInt32();
positionOfNextEntry = reader.BaseStream.Position;
}
return(positionOfNextEntry);
}
/// <inheritdoc />
/// <remarks>The precondition here is that the reader is positioned immediately after the LUIGI block type value.</remarks>
public override int Deserialize(Core.Utility.BinaryReader reader)
{
Length = reader.ReadUInt16();
var bytesRead = PayloadLengthSize;
HeaderCrc = reader.ReadByte();
bytesRead += HeaderChecksumSize;
ValidateHeaderCrc();
if (Length > 0)
{
PayloadCrc = reader.ReadUInt32();
bytesRead += PayloadChecksumSize;
bytesRead += DeserializePayload(reader);
}
return(bytesRead);
}