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88 lines
2.5 KiB
Rust
88 lines
2.5 KiB
Rust
/* Copyright (C) 2022 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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//! lzma decompression utility module.
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use lzma_rs::decompress::{Options, Stream};
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use lzma_rs::error::Error;
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use std::io::{Cursor, Write};
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/// Propagate lzma crate errors
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#[repr(C)]
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pub enum LzmaStatus {
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LzmaOk,
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LzmaIoError,
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LzmaHeaderTooShortError,
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LzmaError,
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LzmaMemoryError,
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LzmaXzError,
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}
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impl From<Error> for LzmaStatus {
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fn from(e: Error) -> LzmaStatus {
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match e {
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Error::IoError(_) => LzmaStatus::LzmaIoError,
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Error::HeaderTooShort(_) => LzmaStatus::LzmaHeaderTooShortError,
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Error::LzmaError(e) => {
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if e.contains("exceeded memory limit") {
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LzmaStatus::LzmaMemoryError
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} else {
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LzmaStatus::LzmaError
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}
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}
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Error::XzError(_) => LzmaStatus::LzmaXzError,
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}
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}
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}
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impl From<std::io::Error> for LzmaStatus {
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fn from(_e: std::io::Error) -> LzmaStatus {
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LzmaStatus::LzmaIoError
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}
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}
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/// Use the lzma algorithm to decompress a chunk of data.
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#[no_mangle]
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pub unsafe extern "C" fn lzma_decompress(
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input: *const u8, input_len: &mut usize, output: *mut u8, output_len: &mut usize,
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memlimit: usize,
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) -> LzmaStatus {
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let input = std::slice::from_raw_parts(input, *input_len);
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let output = std::slice::from_raw_parts_mut(output, *output_len);
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let output = Cursor::new(output);
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let options = Options {
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memlimit: Some(memlimit),
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allow_incomplete: true,
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..Default::default()
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};
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let mut stream = Stream::new_with_options(&options, output);
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if let Err(e) = stream.write_all(input) {
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return e.into();
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}
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match stream.finish() {
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Ok(output) => {
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*output_len = output.position() as usize;
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LzmaStatus::LzmaOk
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}
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Err(e) => e.into(),
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}
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}
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