mirror of
https://github.com/uutils/coreutils
synced 2024-12-18 09:03:14 +00:00
41 lines
1,019 B
Rust
41 lines
1,019 B
Rust
/*
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* This file is part of the uutils coreutils package.
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*
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* (c) Arcterus <arcterus@mail.com>
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* (c) Michael Gehring <mg@ebfe.org>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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use std::io;
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static CRC_TABLE_LEN: uint = 256;
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fn main() {
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let mut table = Vec::with_capacity(CRC_TABLE_LEN);
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for num in range(0, CRC_TABLE_LEN) {
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table.push(crc_entry(num as u8) as u32);
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}
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let mut file = io::File::open_mode(&Path::new("crc_table.rs"), io::Truncate, io::Write).unwrap();
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let output = format!("/* auto-generated (DO NOT EDIT) */
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pub static CRC_TABLE: [u32, ..{}] = {};", CRC_TABLE_LEN, table);
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file.write_line(output.as_slice()).unwrap();
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}
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#[inline]
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fn crc_entry(input: u8) -> u32 {
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let mut crc = input as u32 << 24;
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for _ in range(0u, 8) {
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if crc & 0x80000000 != 0 {
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crc <<= 1;
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crc ^= 0x04c11db7;
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} else {
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crc <<= 1;
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}
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}
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crc
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}
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