From d19c0e432d197d748b3942c32d3126c8705a712a Mon Sep 17 00:00:00 2001 From: trivernis Date: Sun, 1 May 2022 17:50:02 +0200 Subject: [PATCH] Add zip format implementation Signed-off-by: trivernis --- .gitignore | 7 + .idea/.gitignore | 8 + .idea/discord.xml | 7 + .idea/extract-archive.iml | 11 + .idea/modules.xml | 8 + .idea/vcs.xml | 6 + Cargo.lock | 859 ++++++++++++++++++++++++++++++++++++++ Cargo.toml | 20 + src/format/mod.rs | 72 ++++ src/format/zip.rs | 61 +++ src/headers.rs | 5 + src/lib.rs | 2 + src/main.rs | 61 +++ 13 files changed, 1127 insertions(+) create mode 100644 .gitignore create mode 100644 .idea/.gitignore create mode 100644 .idea/discord.xml create mode 100644 .idea/extract-archive.iml create mode 100644 .idea/modules.xml create mode 100644 .idea/vcs.xml create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 src/format/mod.rs create mode 100644 src/format/zip.rs create mode 100644 src/headers.rs create mode 100644 src/lib.rs create mode 100644 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"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"] \ No newline at end of file diff --git a/src/format/mod.rs b/src/format/mod.rs new file mode 100644 index 0000000..f3357ae --- /dev/null +++ b/src/format/mod.rs @@ -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; + fn extract(&self, file: &Path, output: &Path) -> Result<()>; +} + +impl FileFormat for Format { + fn parse(file: &FileObject) -> Result { + 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 { + 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 { + 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) +} diff --git a/src/format/zip.rs b/src/format/zip.rs new file mode 100644 index 0000000..b1f207e --- /dev/null +++ b/src/format/zip.rs @@ -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 { + 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(()) + } +} diff --git a/src/headers.rs b/src/headers.rs new file mode 100644 index 0000000..30a1403 --- /dev/null +++ b/src/headers.rs @@ -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]; diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..f09da69 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,2 @@ +pub mod format; +mod headers; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..d0a9ddb --- /dev/null +++ b/src/main.rs @@ -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(); +}