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use crate::die;
use flate2::read::ZlibDecoder;
use std::fs::File;
use std::io::Read;
use std::path::PathBuf;
pub enum GitObjectType {
Blob,
Commit,
Tag,
Tree,
Undefined,
}
pub struct GitObject {
object_type: GitObjectType,
size: usize,
data: Vec<u8>,
}
impl GitObject {
fn new() -> Self {
Self {
object_type: GitObjectType::Undefined,
size: 0,
data: Vec::new(),
}
}
pub fn from_file(path: PathBuf) -> Self {
if !path.is_file() {
return Self::new();
}
if let Ok(compressed_content) = File::open(path.clone()) {
let sha = path.file_name().unwrap().to_str().unwrap();
let mut decoder = ZlibDecoder::new(compressed_content);
let mut decompressed = Vec::new();
decoder.read_to_end(&mut decompressed).unwrap();
let mut iter = decompressed.iter().peekable();
let type_buffer: Vec<u8> = iter.by_ref()
.take_while(|&&byte| byte != b' ')
.cloned()
.collect();
let size_buffer: Vec<u8> = iter.by_ref()
.take_while(|&&byte| byte != 0)
.cloned()
.collect();
let data: Vec<u8> = iter.cloned().collect();
let object_type = match String::from_utf8_lossy(&type_buffer).to_string().as_str() {
"commit" => { GitObjectType::Commit }
"tree" => { GitObjectType::Tree }
"tag" => { GitObjectType::Tag }
"blob" => { GitObjectType::Blob }
_ => {
die!("Unknown type in object {}", sha);
}
};
let Ok(size) = String::from_utf8_lossy(&size_buffer).to_string().parse::<usize>() else {
die!("Malformed object {}, unknown size", sha);
};
if data.len() != size {
die!("Malformed object {}, size doesn't match", sha);
}
Self {
object_type,
size,
data,
}
} else {
Self::new()
}
}
}
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