8 releases
Uses old Rust 2015
0.3.3 | Feb 22, 2019 |
---|---|
0.3.2 | Feb 22, 2019 |
0.2.2 | Feb 19, 2019 |
0.1.0 | Nov 22, 2018 |
#2327 in Encoding
26 downloads per month
Used in set-encoding
7KB
TBE
Truncated Binary Encoding
https://en.wikipedia.org/wiki/Truncated_binary_encoding
k = floor_log2(n);
u = 2 * exp2(k) - n
Writing
if x < u
write k
least significant bits of x
else add u
to x
and write k
most significant bits of x
and then write a least significant bit of x
.
Reading
- read
k
bits asx
. - if
u
<=x
then read an additional bit and add it tox
as a least significant bit and substractu
.
Examples (MSB first)
n = 2
k = 1;
u = 4 - 2 = 2;
BE | TBE | |
---|---|---|
0 | 0 | |
1 | 1 | |
n | u |
n = 3
k = 2;
u = 1
BE | TBE(MSB) | TBE(LSB) | |
---|---|---|---|
00 | 0X | 0X | |
01 | 10 | 10 | u |
10 | 11 | 11 |
n = 4
k = 2
u = 8 - 4 = 4
BE | TBE | |
---|---|---|
00 | 00 | |
01 | 01 | |
10 | 10 | |
11 | 11 | |
n | u |
n = 5
k = 2;
u = 3;
BE | TBE | |
---|---|---|
000 | 00 | |
001 | 01 | |
010 | 10 | |
011 | 110 | u |
100 | 111 |
n = 6
k = 2;
u = 2;
BE | TBE |
---|---|
000 | 00 |
001 | 01 |
010 | 100 |
011 | 101 |
100 | 110 |
101 | 111 |
n = 7
BE | TBE |
---|---|
000 | 00 |
001 | 010 |
010 | 011 |
011 | 100 |
100 | 101 |
101 | 110 |
110 | 111 |
n = 10
k = 3;
u = 6;
BE | TBE(MSB) | TBE(LSB) |
---|---|---|
0000 | 000X | 000X |
0001 | 001X | 100X |
0010 | 010X | 010X |
0011 | 011X | 110X |
0100 | 100X | 001X |
0101 | 101X | 101X |
0110 | 1100 | 0110 |
0111 | 1101 | 0111 |
1000 | 1110 | 1110 |
1001 | 1111 | 1111 |
Dependencies
~170KB