- Qt thinks UNC URLs should look like: file://1.2.3.4/share/file.img
libcurl likes them: file:////1.2.3.4/share/file.img
So correct that.
- Mention it is an unspecified libcurl error if libcurl passes us
an error code with an empty error message string.
Closes#65
Modern CPUs have special instructions to accelerate computing
SHA hashes.
The Qt QCryptographicHash code is standard C, so not taking
advantage of those though.
Outsource the hashing to OpenSSL that does.
Shaves off some seconds during verification stage.
- Use larger buffer size when writing uncompressed files
(was libcurl's default of 16 kb, change it to 128 kb)
- Uncompress the next MB of data, while it is hashing/writing to
disk in seperate thread.
