// Shared checksum and data length calculations for PAX entry writing.
private void WriteAsPaxSharedInternal(Span <byte> buffer, out long actualLength)
{
actualLength = GetTotalDataBytesToWrite();
int tmpChecksum = WritePosixName(buffer);
tmpChecksum += WriteCommonFields(buffer, actualLength, TarHelpers.GetCorrectTypeFlagForFormat(TarEntryFormat.Pax, _typeFlag));
tmpChecksum += WritePosixMagicAndVersion(buffer);
tmpChecksum += WritePosixAndGnuSharedFields(buffer);
_checksum = WriteChecksum(tmpChecksum, buffer);
}
// Writes the V7 header fields to the specified buffer, calculates and writes the checksum, then returns the final data length.
private long WriteV7FieldsToBuffer(Span <byte> buffer)
{
long actualLength = GetTotalDataBytesToWrite();
TarEntryType actualEntryType = TarHelpers.GetCorrectTypeFlagForFormat(TarEntryFormat.V7, _typeFlag);
int tmpChecksum = WriteName(buffer, out _);
tmpChecksum += WriteCommonFields(buffer, actualLength, actualEntryType);
_checksum = WriteChecksum(tmpChecksum, buffer);
return(actualLength);
}
// Writes the Ustar header fields to the specified buffer, calculates and writes the checksum, then returns the final data length.
private long WriteUstarFieldsToBuffer(Span <byte> buffer)
{
long actualLength = GetTotalDataBytesToWrite();
TarEntryType actualEntryType = TarHelpers.GetCorrectTypeFlagForFormat(TarEntryFormat.Ustar, _typeFlag);
int tmpChecksum = WritePosixName(buffer);
tmpChecksum += WriteCommonFields(buffer, actualLength, actualEntryType);
tmpChecksum += WritePosixMagicAndVersion(buffer);
tmpChecksum += WritePosixAndGnuSharedFields(buffer);
_checksum = WriteChecksum(tmpChecksum, buffer);
return(actualLength);
}
// Constructor called when converting an entry to the selected format.
internal TarEntry(TarEntry other, TarEntryFormat format)
{
if (other is PaxGlobalExtendedAttributesTarEntry)
{
throw new InvalidOperationException(SR.TarCannotConvertPaxGlobalExtendedAttributesEntry);
}
TarEntryType compatibleEntryType = TarHelpers.GetCorrectTypeFlagForFormat(format, other.EntryType);
TarHelpers.ThrowIfEntryTypeNotSupported(compatibleEntryType, format);
_readerOfOrigin = other._readerOfOrigin;
_header = new TarHeader(format, compatibleEntryType, other._header);
}
