Last active
August 1, 2024 04:55
-
-
Save Sainan/02c3ac9cea5015341412c92feec95e56 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function pack_u64_dyn(v) | |
| local out = {} | |
| for i = 1, 8 do | |
| local cur = v & 0x7f | |
| v = v >> 7 | |
| if v ~= 0 then | |
| out[#out + 1] = string.char(cur | 0x80) | |
| else | |
| out[#out + 1] = string.char(cur) | |
| return table.concat(out) | |
| end | |
| end | |
| if v ~= 0 then | |
| out[#out + 1] = string.char(v) | |
| end | |
| return table.concat(out) | |
| end | |
| function unpack_u64_dyn(str) | |
| local v = 0 | |
| local i = 1 | |
| local bits = 0 | |
| while true do | |
| local b = str:byte(i) | |
| i = i + 1 | |
| local has_next = (bits < 56) and (b >> 7) ~= 0 | |
| if has_next then | |
| b = b & 0x7f | |
| end | |
| v = v | (b << bits) | |
| if not has_next then | |
| break | |
| end | |
| bits = bits + 7 | |
| end | |
| return v | |
| end | |
| function pack_i64_dyn(v) | |
| local neg = (v >> 63) | |
| if v < 0 then | |
| v = (v * -1) & ~(1 << 63) | |
| end | |
| return pack_u64_dyn((neg << 6) | ((v & ~0x3f) << 1) | (v & 0x3f)) | |
| end | |
| function unpack_i64_dyn(str) | |
| local v = unpack_u64_dyn(str) | |
| local neg = ((v >> 6) & 1) ~= 0 | |
| v = ((v >> 1) & ~0x3f) | (v & 0x3f) | |
| if neg then | |
| if v == 0 then | |
| v = 1 << 63 | |
| else | |
| v = v * -1 | |
| end | |
| end | |
| return v | |
| end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment