Module zigzag 

Zigzag encoding for signed integers.

Zigzag maps signed integers to unsigned ones so that small-magnitude negative values produce small-magnitude varints. Pair these helpers with the varint functions to encode signed values compactly.

The mapping mirrors the one used by Protocol Buffers:

signed	unsigned
0	0
-1	1
1	2
-2	3
2	4

Functions

decode_i32

Recover the signed i32 from a zigzag-encoded u32.

decode_i64

Recover the signed i64 from a zigzag-encoded u64.

encode_i32

Map a signed i32 to its zigzag-encoded u32.

encode_i64

Map a signed i64 to its zigzag-encoded u64.