xdelta

Re: 3.0y (source)
Re: 3.0x (source)

Version 3.0x 3.0y fixes several regressions introduced in 3.0w related to the new support for streaming the source file from a FIFO. This was a long-requested feature and I'm pleased to report that now, with the fixes in 3.0x 3.0y, it appears to be working quite well. The upshot of this feature is that you can encode or decode based on a compressed source file, without decompressing it to an intermediate file. In fact, you can expect the same compression with or without a streaming source file.

There were also reports of the encoder becoming I/O bound in previous releases, caused by the encoder improperly seeking backwards farther than the settings (namely, the -B flag) allowed. This is also fixed, and there's a new test to ensure it won't happen again.

Windows users: I need to investigate issue 101 before building a release of3.0x 3.0y. Until I can confirm that streaming-source-file support works on Windows, please continue using the 3.0u release.

Update: The built-in support for automatic decompression of inputs is interacting badly with the new source handling logic, results in poor compression.