Content-Transfer-Encoding: binary is not decoded correctly

[xyzzy42]

The problem is caused by the code in FFGET_getnewblock() that turns NUL bytes into spaces. The binary encoding of a binary file, such as an image, will most likely contain NUL bytes. Turning them into spaces will corrupt the file.

A workaround is to enable the undocumented --formdata option that disables the NUL to space conversion. However, it would be more correct to disable the conversion when processing the binary encoded data and turn it back on afterward.