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/* Copyright (C) 2018 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
use nom7::{
bytes::streaming::{take, take_until},
combinator::map_res,
IResult,
};
use std;
fn parse_len(input: &str) -> Result<u32, std::num::ParseIntError> {
input.parse::<u32>()
}
pub fn parse_message(i: &[u8]) -> IResult<&[u8], String> {
let (i, len) = map_res(map_res(take_until(":"), std::str::from_utf8), parse_len)(i)?;
let (i, _sep) = take(1_usize)(i)?;
let (i, msg) = map_res(take(len as usize), std::str::from_utf8)(i)?;
let result = msg.to_string();
Ok((i, result))
}
#[cfg(test)]
mod tests {
use super::*;
use nom7::Err;
/// Simple test of some valid data.
#[test]
fn test_parse_valid() {
let buf = b"12:Hello World!4:Bye.";
let result = parse_message(buf);
match result {
Ok((remainder, message)) => {
// Check the first message.
assert_eq!(message, "Hello World!");
// And we should have 6 bytes left.
assert_eq!(remainder.len(), 6);
}
Err(Err::Incomplete(_)) => {
panic!("Result should not have been incomplete.");
}
Err(Err::Error(err)) | Err(Err::Failure(err)) => {
panic!("Result should not be an error: {:?}.", err);
}
}
}
}
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