Fix LongNames failing for names specifically 512n+1 chars long: we're allocating an extra char which is written NULL for whatever reason, but the writeout code were forgetting to actually write it if it were the only char to fall out of the write buffer of 512 bytes.

Author: hypersw

ICSharpCode.SharpZipLib/Tar/TarOutputStream.cs

@@ -238,9 +238,9 @@ public void PutNextEntry(TarEntry entry)
 
 				int nameCharIndex = 0;
 
-				while (nameCharIndex < entry.TarHeader.Name.Length) {
+				while (nameCharIndex < entry.TarHeader.Name.Length + 1 /* we've allocated one for the null char, now we must make sure it gets written out */) {
 					Array.Clear(blockBuffer, 0, blockBuffer.Length);
-					TarHeader.GetAsciiBytes(entry.TarHeader.Name, nameCharIndex, this.blockBuffer, 0, TarBuffer.BlockSize);
+					TarHeader.GetAsciiBytes(entry.TarHeader.Name, nameCharIndex, this.blockBuffer, 0, TarBuffer.BlockSize); // This func handles OK the extra char out of string length
 					nameCharIndex += TarBuffer.BlockSize;
 					buffer.WriteBlock(blockBuffer);
 				}