/// <summary>
/// Parse TarHeader information from a header buffer.
/// </summary>
/// <param name = "header">
/// The tar entry header buffer to get information from.
/// </param>
public void ParseBuffer(byte[] header)
{
if (header == null)
{
throw new ArgumentNullException("header");
}
int offset = 0;
name = TarHeader.ParseName(header, offset, TarHeader.NAMELEN).ToString();
offset += TarHeader.NAMELEN;
mode = (int)TarHeader.ParseOctal(header, offset, TarHeader.MODELEN);
offset += TarHeader.MODELEN;
UserId = (int)TarHeader.ParseOctal(header, offset, TarHeader.UIDLEN);
offset += TarHeader.UIDLEN;
GroupId = (int)TarHeader.ParseOctal(header, offset, TarHeader.GIDLEN);
offset += TarHeader.GIDLEN;
Size = TarHeader.ParseOctal(header, offset, TarHeader.SIZELEN);
offset += TarHeader.SIZELEN;
ModTime = GetDateTimeFromCTime(TarHeader.ParseOctal(header, offset, TarHeader.MODTIMELEN));
offset += TarHeader.MODTIMELEN;
checksum = (int)TarHeader.ParseOctal(header, offset, TarHeader.CHKSUMLEN);
offset += TarHeader.CHKSUMLEN;
TypeFlag = header[offset++];
LinkName = TarHeader.ParseName(header, offset, TarHeader.NAMELEN).ToString();
offset += TarHeader.NAMELEN;
Magic = TarHeader.ParseName(header, offset, TarHeader.MAGICLEN).ToString();
offset += TarHeader.MAGICLEN;
Version = TarHeader.ParseName(header, offset, TarHeader.VERSIONLEN).ToString();
offset += TarHeader.VERSIONLEN;
UserName = TarHeader.ParseName(header, offset, TarHeader.UNAMELEN).ToString();
offset += TarHeader.UNAMELEN;
GroupName = TarHeader.ParseName(header, offset, TarHeader.GNAMELEN).ToString();
offset += TarHeader.GNAMELEN;
DevMajor = (int)TarHeader.ParseOctal(header, offset, TarHeader.DEVLEN);
offset += TarHeader.DEVLEN;
DevMinor = (int)TarHeader.ParseOctal(header, offset, TarHeader.DEVLEN);
// Fields past this point not currently parsed or used...
isChecksumValid = Checksum == TarHeader.MakeCheckSum(header);
}
/// <summary>
/// Parse TarHeader information from a header buffer.
/// </summary>
/// <param name = "header">
/// The tar entry header buffer to get information from.
/// </param>
/// <param name = "nameEncoding">
/// The <see cref="Encoding"/> used for the Name field, or null for ASCII only
/// </param>
public void ParseBuffer(byte[] header, Encoding nameEncoding)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
int offset = 0;
name = ParseName(header, offset, NAMELEN, nameEncoding).ToString();
offset += NAMELEN;
mode = (int)ParseOctal(header, offset, MODELEN);
offset += MODELEN;
UserId = (int)ParseOctal(header, offset, UIDLEN);
offset += UIDLEN;
GroupId = (int)ParseOctal(header, offset, GIDLEN);
offset += GIDLEN;
Size = ParseBinaryOrOctal(header, offset, SIZELEN);
offset += SIZELEN;
ModTime = GetDateTimeFromCTime(ParseOctal(header, offset, MODTIMELEN));
offset += MODTIMELEN;
checksum = (int)ParseOctal(header, offset, CHKSUMLEN);
offset += CHKSUMLEN;
TypeFlag = header[offset++];
LinkName = ParseName(header, offset, NAMELEN, nameEncoding).ToString();
offset += NAMELEN;
Magic = ParseName(header, offset, MAGICLEN, nameEncoding).ToString();
offset += MAGICLEN;
if (Magic == "ustar")
{
Version = ParseName(header, offset, VERSIONLEN, nameEncoding).ToString();
offset += VERSIONLEN;
UserName = ParseName(header, offset, UNAMELEN, nameEncoding).ToString();
offset += UNAMELEN;
GroupName = ParseName(header, offset, GNAMELEN, nameEncoding).ToString();
offset += GNAMELEN;
DevMajor = (int)ParseOctal(header, offset, DEVLEN);
offset += DEVLEN;
DevMinor = (int)ParseOctal(header, offset, DEVLEN);
offset += DEVLEN;
string prefix = ParseName(header, offset, PREFIXLEN, nameEncoding).ToString();
if (!string.IsNullOrEmpty(prefix))
{
Name = prefix + '/' + Name;
}
}
isChecksumValid = Checksum == TarHeader.MakeCheckSum(header);
}