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/* Copyright (C) 2022 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.
*/
//! lzma decompression utility module.
use lzma_rs::decompress::{Options, Stream};
use lzma_rs::error::Error;
use std::io::{Cursor, Write};
/// Propagate lzma crate errors
#[repr(C)]
pub enum LzmaStatus {
LzmaOk,
LzmaIoError,
LzmaHeaderTooShortError,
LzmaError,
LzmaMemoryError,
LzmaXzError,
}
impl From<Error> for LzmaStatus {
fn from(e: Error) -> LzmaStatus {
match e {
Error::IoError(_) => LzmaStatus::LzmaIoError,
Error::HeaderTooShort(_) => LzmaStatus::LzmaHeaderTooShortError,
Error::LzmaError(e) => {
if e.contains("exceeded memory limit") {
LzmaStatus::LzmaMemoryError
} else {
LzmaStatus::LzmaError
}
}
Error::XzError(_) => LzmaStatus::LzmaXzError,
}
}
}
impl From<std::io::Error> for LzmaStatus {
fn from(_e: std::io::Error) -> LzmaStatus {
LzmaStatus::LzmaIoError
}
}
/// Use the lzma algorithm to decompress a chunk of data.
#[no_mangle]
pub unsafe extern "C" fn lzma_decompress(
input: *const u8, input_len: &mut usize, output: *mut u8, output_len: &mut usize,
memlimit: usize,
) -> LzmaStatus {
let input = std::slice::from_raw_parts(input, *input_len);
let output = std::slice::from_raw_parts_mut(output, *output_len);
let output = Cursor::new(output);
let options = Options {
memlimit: Some(memlimit),
allow_incomplete: true,
..Default::default()
};
let mut stream = Stream::new_with_options(&options, output);
if let Err(e) = stream.write_all(input) {
return e.into();
}
match stream.finish() {
Ok(output) => {
*output_len = output.position() as usize;
LzmaStatus::LzmaOk
}
Err(e) => e.into(),
}
}
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