CodeSnip Old Code (SVN)

Tweaked and corrected commenting.

* Changed TTextRoutineDoc to use TStringWriter from SysUtils to create output string which is then converted written to a stream rather than TStrStreamWriter.
* Removed UStrStreamWriter unit from project now that TStrStreamWriter is no longer used anywhere.

Reimplemented reader and writer classes in UDataStreamIO unit:
* Deleted unused TDataStreamWriter class.
* Created new class heirachy for reader classes with common interface for text and binary reader objects. This meant creating a common abstract base class and renaming numerous methods and creating new implementations.
* Renamed several classes and methods of writer class.
* Text stream reader class changed to reject any non-MBCS encoding since its layout requires hex characters to only occupy one byte, which is not the case in Unicode encodings.

Updated using units re class and method name changes.

Changed to read strings from data stream as Unicode. Previously was reading string as ANSI and converting them in this unit.

Fixed bug in TBinDataStreamWriter.WriteBytes.

Changed v4 file format again. Checksums no longer have preceding size - size is known and fixed.

* Added new TBackupFileInfo helper class used by reader and writer classes.
* Stream being read initialised by skipping over any watermark.
* Refactored file reader classes, pulling out parent classes for text and binary based reader classes.

Modified v4 file format: file id and file count are now written in binary rather than as formatted text.

Substantially revised way that TBackupFileLoaderFactory class operates. Now much more general and more complex. Uses watermarks to identify required loader classes.

Added support for new v4 backup file format, implemented in TV4BackupFileLoader. Also added new TBackupFileWriter class to do the actual backup file creation.