/// <summary>
/// Appends a file to the content and signature archives, watching the content archive file size.
/// Returns the partial file entry if the volume size was exceeded.
/// Returns null if the file was written entirely.
/// </summary>
/// <param name="entry">The entry that describes the partial file</param>
/// <param name="contentfile">The content archive file</param>
/// <param name="signaturefile">The signature archive file</param>
/// <param name="volumesize">The max allowed volumesize</param>
/// <returns>The partial file entry if the volume size was exceeded. Returns null if the file was written entirely.</returns>
private PartialFileEntry WritePossiblePartial(PartialFileEntry entry, Library.Interface.ICompression contentfile, Library.Interface.ICompression signaturefile, long volumesize)
{
long startPos = entry.Stream.Position;
//Protect against writing this file if there is not enough space to hold the INCOMPLETE_FILE
if (startPos == 0 && contentfile.Size + contentfile.FlushBufferSize + (entry.ExtraSize * 2) > volumesize)
return entry;
PartialFileEntry pe = WritePossiblePartialInternal(entry, contentfile, volumesize);
if (pe != null)
{
//The record is (still) partial
string[] tmplines = new PartialEntryRecord(entry.relativeName, startPos, entry.Stream.Position - startPos, entry.Stream.Length).Serialize();
contentfile.WriteAllLines(INCOMPLETE_FILE, tmplines);
signaturefile.WriteAllLines(INCOMPLETE_FILE, tmplines);
//If we are debugging, this can be nice to have
Logging.Log.WriteMessage(string.Format(Strings.RSyncDir.PartialFileAddedLogMessage, entry.relativeName, startPos), XervBackup.Library.Logging.LogMessageType.Information);
}
else
{
//If the file was partial before, mark the file as completed
if (startPos != 0)
{
string[] tmplines = new PartialEntryRecord(entry.relativeName, startPos, entry.Stream.Position - startPos, entry.Stream.Length).Serialize();
contentfile.WriteAllLines(COMPLETED_FILE, tmplines);
signaturefile.WriteAllLines(COMPLETED_FILE, tmplines);
}
//Add signature AFTER content is completed.
//If content is present, it is restoreable, if signature is missing, file will be backed up on next run
//If signature is present, but not content, the entire differential sequence will be unable to recover the file
if (!entry.DumpSignature(signaturefile))
{
if (m_stat != null)
m_stat.LogWarning(string.Format(Strings.RSyncDir.FileChangedWhileReadWarning, entry.fullname), null);
}
entry.Dispose();
}
return pe;
}
