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use std::fs;
use crate::{create_path_or_die, die};
use flate2::read::{ZlibDecoder, ZlibEncoder};
use std::fs::File;
use std::io::{BufReader, Read, Write};
use std::path::PathBuf;
use flate2::Compression;
use sha1::{Digest, Sha1};
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() {
"blob" => { GitObjectType::Blob }
"commit" => { GitObjectType::Commit }
"tag" => { GitObjectType::Tag }
"tree" => { GitObjectType::Tree }
_ => {
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()
}
}
pub fn write_to_file(&mut self, git_object_dir: PathBuf) {
let object_type = match self.object_type {
GitObjectType::Blob => { "blob " }
GitObjectType::Commit => { "commit " }
GitObjectType::Tag => { "tag " }
GitObjectType::Tree => { "tree " }
_ => { die!("Cannot write to object file, type unknown") }
};
let mut bytes_to_write = Vec::from(object_type);
let mut size_in_bytes = Vec::from(self.size.to_string());
bytes_to_write.append(&mut size_in_bytes);
bytes_to_write.push(0);
bytes_to_write.append(&mut self.data);
let mut hasher = Sha1::new();
hasher.update(&bytes_to_write);
let hash = hasher.finalize();
let sha = hash.iter()
.map(|byte| format!("{:02x}", byte))
.collect::<String>();
let buff = BufReader::new(bytes_to_write.as_slice());
let mut encoder = ZlibEncoder::new(buff, Compression::fast());
let mut compressed = Vec::new();
encoder.read_to_end(&mut compressed).unwrap();
let object_dir = git_object_dir.join(&sha[..2]);
create_path_or_die!(dir: object_dir.clone(), "Failed to create object file, could not create directory");
let mut file = fs::OpenOptions::new()
.create(true)
.write(true)
.open(object_dir.join(&sha[2..])).unwrap();
file.write_all(compressed.as_slice()).unwrap();
}
}
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