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Add zip format implementation

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Signed-off-by: trivernis <trivernis@protonmail.com>
main
trivernis 3 years ago
commit d19c0e432d
Signed by: Trivernis
GPG Key ID: DFFFCC2C7A02DB45
13 changed files with 1127 additions and 0 deletions
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7
.gitignore vendored
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/target
.idea
*.tar.*
*.gz
*.xz
*.zip
out

8
.idea/.gitignore vendored
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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

7
.idea/discord.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
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<option name="description" value="" />
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11
.idea/extract-archive.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module type="CPP_MODULE" version="4">
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8
.idea/modules.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/.idea/extract-archive.iml" filepath="$PROJECT_DIR$/.idea/extract-archive.iml" />
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.idea/vcs.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
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859
Cargo.lock generated
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20
Cargo.toml
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@ -0,0 +1,20 @@
[package]
name = "extract-archive"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[[bin]]
name = "extract-archive"
[dependencies]
anyhow = "1.0.57"
color-eyre = "0.6.1"
tracing = "0.1.34"
zip = "0.6.2"
tracing-subscriber = {version = "0.3.11", features = ["env-filter"]}
[dependencies.clap]
version = "3.1.12"
features = ["derive"]

72
src/format/mod.rs
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@ -0,0 +1,72 @@
mod zip;
use crate::format::zip::ZipFormat;
use anyhow::{bail, Result};
use std::fs::File;
use std::io::Read;
use std::path::Path;
pub enum Format {
Zip(ZipFormat),
Xz,
Gz,
Tar,
}
pub struct FileObject {
pub ext: String,
pub header: [u8; 32],
}
pub trait FileFormat: Sized {
fn parse(file: &FileObject) -> Result<Self>;
fn extract(&self, file: &Path, output: &Path) -> Result<()>;
}
impl FileFormat for Format {
fn parse(file: &FileObject) -> Result<Self> {
if let Ok(zip) = ZipFormat::parse(file) {
Ok(Self::Zip(zip))
} else {
bail!("Unknown file format");
}
}
fn extract(&self, file: &Path, output: &Path) -> Result<()> {
match self {
Format::Zip(zip) => zip.extract(file, output),
_ => bail!("Not implemented"),
}
}
}
/// Parses the format of the file
pub fn parse_format(file: &Path) -> Result<Format> {
let obj = FileObject {
ext: get_file_extensions(file).unwrap_or_default(),
header: get_file_header(file)?,
};
Format::parse(&obj)
}
/// Returns the extensions for a given file.
/// This works different to the extension format of the standard library
/// as it recognizes everything after the first dot as an extension. As we're
/// just using the extensions for format detection that behaviour isn't a problem.
fn get_file_extensions(path: &Path) -> Option<String> {
let name = path.file_name()?.to_string_lossy();
let extensions: Vec<&str> = name.split('.').skip(1).collect();
Some(extensions.join("."))
}
/// Returns the first 32 bytes of the file that can be used to detect
/// the signature from the magic number
fn get_file_header(path: &Path) -> Result<[u8; 32]> {
let mut file = File::open(path)?;
let mut header_buf = [0u8; 32];
file.read_exact(&mut header_buf)?;
Ok(header_buf)
}

61
src/format/zip.rs
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@ -0,0 +1,61 @@
use crate::format::{FileFormat, FileObject};
use anyhow::{bail, Context, Result};
use std::fs::File;
use std::path::Path;
use std::{fs, io};
use zip::ZipArchive;
const ZIP_HEADER: &[u8] = &[0x50, 0x4b];
pub struct ZipFormat;
impl FileFormat for ZipFormat {
fn parse(file: &FileObject) -> Result<Self> {
if file.header.starts_with(ZIP_HEADER) {
if !file.ext.ends_with("zip") {
tracing::warn!("The file has a zip signature but no zip extension.");
}
Ok(Self)
} else {
bail!("Not a zip file");
}
}
fn extract(&self, file: &Path, output: &Path) -> Result<()> {
let file = File::open(file)?;
let mut archive = ZipArchive::new(file).context("Opening zip file")?;
tracing::info!("Zip file with {} entries", archive.len());
for i in 0..archive.len() {
let mut file = archive.by_index(i).context("Getting file by index")?;
let path = match file.enclosed_name() {
None => {
tracing::error!(
"Cannot extract {:?} because it has an invalid name",
file.name()
);
continue;
}
Some(path) => path,
};
let output_path = output.join(path);
if (*file.name()).ends_with('/') {
tracing::debug!("Creating directory {output_path:?}");
fs::create_dir_all(output_path).context("Creating directory")?;
} else {
if let Some(parent) = output_path.parent() {
if !parent.exists() {
tracing::debug!("Creating parent directory {parent:?}");
fs::create_dir_all(parent).context("Creating parent dir")?;
}
}
let mut file_output = File::create(&output_path).context("Creating output file")?;
tracing::debug!("Extracting to {output_path:?}");
io::copy(&mut file, &mut file_output).context("Writing output file")?;
}
}
Ok(())
}
}

5
src/headers.rs
Unescape Escape View File

@ -0,0 +1,5 @@
/// Container Formats
/// Compression Methods
pub const GZIP_HEADER: &[u8] = &[0x1f, 0x8b];
pub const XZ_HEADER: &[u8] = &[0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00];

2
src/lib.rs
Unescape Escape View File

@ -0,0 +1,2 @@
pub mod format;
mod headers;

61
src/main.rs
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@ -0,0 +1,61 @@
use clap::{Parser, Subcommand};
use extract_archive::format::{parse_format, FileFormat};
use std::fs;
use std::path::PathBuf;
use std::str::FromStr;
use tracing_subscriber::fmt::format::FmtSpan;
use tracing_subscriber::EnvFilter;
#[derive(Debug, Clone, Parser)]
#[clap(name="extract-archive", version=env!("CARGO_PKG_VERSION"), about=env!("CARGO_PKG_DESCRIPTION"))]
struct Args {
/// The operation to perform
#[clap(subcommand)]
pub operation: Operation,
}
#[derive(Debug, Clone, Subcommand)]
pub enum Operation {
/// Extracts a given file
Extract {
/// The file to extract
file: PathBuf,
/// The output folder for the given file
output: PathBuf,
},
}
fn main() {
color_eyre::install().unwrap();
init_logger();
let args: Args = Args::parse();
match args.operation {
Operation::Extract { output, file } => {
if !output.exists() {
fs::create_dir_all(&output).expect("Failed to create output directory");
}
if output.is_file() {
panic!("The given output path is a file");
}
let format = parse_format(&file).expect("Failed to parse file format");
format
.extract(&file, &output)
.expect("Failed to extract file");
}
}
}
fn init_logger() {
const DEFAULT_ENV_FILTER: &str = "info";
let filter_string =
std::env::var("RUST_LOG").unwrap_or_else(|_| DEFAULT_ENV_FILTER.to_string());
let env_filter =
EnvFilter::from_str(&*filter_string).expect("failed to parse env filter string");
tracing_subscriber::fmt::SubscriberBuilder::default()
.with_env_filter(env_filter)
.with_writer(std::io::stdout)
.with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
.compact()
.init();
}
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