This commit builds upon @wikol's Pollard rho implementation.
It adds the following:
1. A generator for prime inverse tables. With these, we can do
very fast divisibility tests (a single multiply and comparison)
for small primes (presently, the first 1000 primes are in the
table, which means all numbers of ~26 bits or less can be
factored very quickly.
2. Always try prime inverse tables before jumping into Pollard's
rho method or using trial division.
3. Since we have eliminated all small factors by the time we're
done with the table division, only use slow trial division when
the number is big enough to cause overflow issues in Pollard's
rho, and jump out of trial division and into Pollard's rho as
soon as the number is small enough.
4. Updates the Makefile to regenerate the prime table if it's not
up-to-date.
The utility need a substantial rewrite due to library changes and
lifetime issues. I needed to implement the MultiWriter struct since it
was no longer available.
I upgraded to the recent Rust release. The only major change was the
reduction of the sleep millisecond resolution from u64 to u32 (this
matches the thread::sleep_ms() method).
This is a reworked version of expand. I did this for two main
reasons:
1. The previous version assumed the input was UTF-8. This
version is compatible with both UTF-8 and non-UTF-8 inputs.
2. This version has a new flag, -U, which forces expand to
treat input as 8-bit ASCII rather than interpreting it
as UTF-8. This might be handy in some cases.
This is a reworked version of unexpand. I did this for two main
reasons:
1. The previous version of unexpand had issues correctly computing
tabstops when the `-a` flag was supplied.
2. The previous version assumed the input was UTF-8. This version works
with non-UTF-8 inputs.
3. This version has a new flag, -U, which forces unexpand to
treat input as 8-bit ASCII rather than interpreting it
as UTF-8. This might be handy in some cases.
