/// <summary>
/// Compares bytes in '<paramref name="entry"/>' with <paramref name="sourceBuffer"/>.
/// </summary>
private async Task <ArchiveEntryCompare> Diff(byte[] sourceBuffer, ArchiveEntry entry)
{
return(await Task.Run(() =>
{
if (this.Entry == entry)
{
return new ArchiveEntryCompare(entry, false, CompareProperties(this.Entry, entry));
}
bool diff = false;
using (var compareMS = entry.GetRawDataStream())
{
byte[] compareBuffer;
int chunk = 0;
while ((compareBuffer = compareMS.ReadBytes(BufferSize)).Length > 0)
{
for (int i = 0; i < compareBuffer.Length; i++)
{
if (sourceBuffer[i + (BufferSize * chunk)] != compareBuffer[i])
{
diff = true;
break;
}
}
if (diff)
{
break; // break again if diff
}
chunk++;
}
}
return new ArchiveEntryCompare(entry, diff, CompareProperties(this.Entry, entry));
}));
}