51 lines
1.7 KiB
Rust
51 lines
1.7 KiB
Rust
// Copyright (C) 2021 Pascal Engélibert
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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use crate::*;
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use flate2::read::ZlibDecoder;
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pub const CHUNK_FILE_PREFIX: &str = "_";
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pub const CHUNK_FILE_EXT: &str = ".bin.gz";
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/// Read and decompress chunk file
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pub fn read_compressed_chunk(
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chunk_index: u32,
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chunks_folder_path: &Path,
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remove: bool,
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) -> std::io::Result<Option<Vec<u8>>> {
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let file_path = chunks_folder_path.join(format!(
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"{}{}{}",
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CHUNK_FILE_PREFIX, chunk_index, CHUNK_FILE_EXT
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));
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if !file_path.exists() {
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return Ok(None);
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}
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if std::fs::metadata(file_path.as_path())?.len() > 0 {
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let file = std::fs::File::open(file_path.as_path())?;
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let mut z = ZlibDecoder::new(file);
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let mut decompressed_bytes = Vec::new();
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z.read_to_end(&mut decompressed_bytes)?;
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if remove {
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std::fs::remove_file(file_path)?;
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}
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Ok(Some(decompressed_bytes))
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} else {
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if remove {
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std::fs::remove_file(file_path)?;
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}
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Ok(None)
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}
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}
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