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Nov 26, 2020, 9:30 PM

RXG3CUOJVQSX4Z4T32PJHGDA5CMZEVP543EXAVL6HYDEU7V6YYWQC

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file addition: src (dxwrx-rx-r)

[1.0]
file addition: lib.rs (-xw-x--x--)

[0.6]

/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

//! LibRsync
//! # Examples
//! In the following example, the signature file should be computed on the local file, sent to the remote machine where the delta is computed. Then, `delta_file` must be run on the remote machine, creating a file /tmp/delta. Then, /tmp/delta should be copied to the local machine, and finally `patch_file` must be applied to write a copy of the remote file in /tmp/new.
//!
//! ```
//! extern crate rsync;
//! use rsync::*;
//!
//! fn main(){
//! sig_file("/tmp/old","/tmp/old.sig",2048,8,None).unwrap();
//! let sig=loadsig_file("/tmp/old.sig",None).unwrap();
//! delta_file(&sig, "/tmp/new", "/tmp/delta",None).unwrap();
//! patch_file("/tmp/old","/tmp/delta","/tmp/new.new",None).unwrap();
//! }
//! ```

extern crate libc;
use libc::{c_int,c_char,size_t,c_longlong,FILE,fopen,fclose,strlen};
use std::ptr;

use std::path::{Path};

use std::{error,fmt};
#[allow(missing_copy_implementations)]
enum CRsSignature {}
type CRsResult=c_int;

// This needs to be generated from the C headers.
type RsLongT=c_longlong;

#[repr(C)]
pub struct rs_stats_t {
op:*const c_char,
lit_cmds:c_int,
lit_bytes:RsLongT,
lit_cmdbytes:RsLongT,
copy_cmds:RsLongT,
copy_bytes:RsLongT,
copy_cmdbytes:RsLongT,
sig_cmds:RsLongT,
sig_bytes:RsLongT,
false_matches:c_int,
sig_blocks:RsLongT,
block_len:size_t,
in_bytes:RsLongT,
out_bytes:RsLongT
}

#[derive(Debug)]
pub enum Error {
Error(c_int),
PathEncoding,
FileMissing,
IO(std::io::Error)
}

extern "C" {
fn rs_loadsig_file(old_file:*const FILE, sig_out:*mut*mut CRsSignature,stats:*mut rs_stats_t)->CRsResult;
fn rs_sig_file(old_file:*const FILE,sig_file:*const FILE,
block_len:size_t, strong_len:size_t,
stats:*mut rs_stats_t)->CRsResult;
fn rs_delta_file(sig:*const CRsSignature,input_file:*const FILE,output_file:*const FILE,stats:*mut rs_stats_t)->CRsResult;
fn rs_patch_file(basis:*const FILE, delta:*const FILE, new_file:*const FILE, stats:*mut rs_stats_t)->CRsResult;
fn rs_strerror(err:CRsResult)->*const c_char;
fn rs_free_sumset(sig:*const CRsSignature);
fn rs_build_hash_table(sig:*mut CRsSignature)->c_int;
fn rs_sumset_dump(sig:*const CRsSignature);
}

pub fn sumset_dump(sig:&Signature) {
unsafe { rs_sumset_dump(sig.sig) }
}

pub struct Signature {
sig:*mut CRsSignature
}

impl Drop for Signature {
fn drop(&mut self){
unsafe { rs_free_sumset(self.sig) }
}
}

/// Generates a signature of the "old_file" input file and writes it to "signature_file".
pub fn sig_file<P:AsRef<Path>>(old_file:P,signature_file:P,
block_len:usize,strong_len:usize,stats:Option<&mut rs_stats_t>)->Result<(),Error>{
let old=old_file.as_ref().as_os_str().to_os_string();
let sig=signature_file.as_ref().as_os_str().to_os_string();
match (old.to_str(),sig.to_str()) {
(Some(old),Some(sig))=>{
unsafe {
let old=std::ffi::CString::new(old).unwrap();
let fi=fopen(old.as_ptr() as *const c_char,"rb".as_ptr() as *const c_char);
if !fi.is_null() {
let sig=std::ffi::CString::new(sig).unwrap();
let fo=fopen(sig.as_ptr() as *const c_char,"wb".as_ptr() as *const c_char);
let e=rs_sig_file(fi,fo,
block_len as size_t,
strong_len as size_t,
match stats {
None => std::ptr::null_mut(),
Some(x)=>x
});
fclose(fi);
fclose(fo);
if e==0 { Ok(()) } else { Err(Error::Error(e)) }
} else {
println!("old: {:?}",old);
Err(Error::FileMissing)
}
}
},
_=>Err(Error::PathEncoding)
}
}

/// Loads a signature from "sig_file".
pub fn loadsig_file<P:AsRef<Path>>(sig_file:P,stats:Option<&mut rs_stats_t>)->Result<Signature,Error>{
let sig_file=sig_file.as_ref().as_os_str().to_os_string();
match sig_file.to_str() {
Some(s)=>
unsafe {
let mut sig_out=ptr::null_mut();
let s=std::ffi::CString::new(s).unwrap();
let fi=fopen(s.as_ptr() as *const c_char,"rb".as_ptr() as *const c_char);
if !fi.is_null(){
let e=rs_loadsig_file(fi, &mut sig_out,
match stats {
None => std::ptr::null_mut(),
Some(x)=>x
});
fclose(fi);
if e==0 { Ok(Signature{sig:sig_out}) } else { Err(Error::Error(e)) }
} else {
Err(Error::FileMissing)
}
},
None =>{
Err(Error::PathEncoding)
}
}
}

/// Produce a delta from a signature and a "new" file.
pub fn delta_file<P:AsRef<Path>>(sig:&Signature,input_file:P,output_file:P,stats:Option<&mut rs_stats_t>)->Result<(),Error>{
let input_file=input_file.as_ref().as_os_str().to_os_string();
let output_file=output_file.as_ref().as_os_str().to_os_string();
match (input_file.to_str(),output_file.to_str()) {
(Some(i),Some(o))=>{
unsafe {
let i=std::ffi::CString::new(i).unwrap();
let fi=fopen(i.as_ptr() as *const c_char,"rb".as_ptr() as *const c_char);
if !fi.is_null() {
let o=std::ffi::CString::new(o).unwrap();
let fo=fopen(o.as_ptr() as *const c_char,"wb".as_ptr() as *const c_char);
rs_build_hash_table(sig.sig);
let e=rs_delta_file(sig.sig,fi,fo,
match stats {
None => std::ptr::null_mut(),
Some(x)=>x
});
fclose(fi);
fclose(fo);
if e==0 { Ok(()) } else { Err(Error::Error(e)) }
} else {
Err(Error::IO(std::io::Error::last_os_error()))
}
}
},
_=>Err(Error::PathEncoding)
}
}

/// Applies a delta file (or a "patch") to "old_file", and write the result to "new_file".
pub fn patch_file<P:AsRef<Path>>(old_file:P,delta:P,new_file:P,stats:Option<&mut rs_stats_t>)->Result<(),Error>{
let old_file=old_file.as_ref().as_os_str().to_os_string();
let delta=delta.as_ref().as_os_str().to_os_string();
let new_file=new_file.as_ref().as_os_str().to_os_string();

match (old_file.to_str(),delta.to_str(),new_file.to_str()) {
(Some(old),Some(delta),Some(new))=>{
unsafe {
let old=std::ffi::CString::new(old).unwrap();
let fa=fopen(old.as_ptr() as *const c_char,"rb".as_ptr() as *const c_char);
let delta=std::ffi::CString::new(delta).unwrap();
let fb=fopen(delta.as_ptr() as *const c_char,"rb".as_ptr() as *const c_char);
let new=std::ffi::CString::new(new).unwrap();
let fc=fopen(new.as_ptr() as *const c_char,"wb".as_ptr() as *const c_char);
if !fa.is_null() && !fb.is_null() {
let e=rs_patch_file(fa,fb,fc,match stats { Some(st)=>st, None => std::ptr::null_mut() });
fclose(fa);
fclose(fb);
fclose(fc);
if e==0 { Ok(()) } else { Err(Error::Error(e)) }
} else {
Err(Error::FileMissing)
}
}
},
_=>Err(Error::PathEncoding)
}
}

impl error::Error for Error {
fn cause(&self) -> Option<&dyn error::Error> {
match *self {
Error::IO(ref e)=>Some(e),
_ => None
}
}
}

impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::PathEncoding => write!(f,"Error in the encoding of a path"),
Error::FileMissing => write!(f,"File missing"),
Error::Error(e)=>{
write!(f,"{}",
unsafe {
let c=rs_strerror(e);
std::str::from_utf8_unchecked(
std::slice::from_raw_parts(c as *const u8,strlen(c))
)
})
},
Error::IO(ref e)=>e.fmt(f)
}
}
}

#[cfg(test)]
mod tests {
use super::*;
use std::fs::File;
use std::io::prelude::*;
extern crate rand;
#[test]
fn test() {
let mut local:Vec<u8>=vec![0;10000];
let mut remote:Vec<u8>=vec![0;10000];
for x in local.iter_mut() { *x = rand::random() }
for x in remote.iter_mut() { *x = rand::random() }

let local_file="local";
let remote_file="remote";

{
let mut f = File::create(local_file).unwrap();
f.write_all(&local[..]).unwrap();
let mut f = File::create(remote_file).unwrap();
f.write_all(&remote[..]).unwrap();
}
let signature_file="local.sig";
sig_file(local_file,signature_file,2048,8,None).unwrap();

let signature=loadsig_file(signature_file,None).unwrap();

let delta="delta";
delta_file(&signature,remote_file,delta,None).unwrap();
let copy_file="remote.copy";
patch_file(local_file,delta,copy_file,None).unwrap();

let mut f = File::open(copy_file).unwrap();
let mut contents: Vec<u8> = Vec::new();
let _ = f.read_to_end(&mut contents).unwrap();

if contents!=remote { panic!("test failled") }
}
}
file addition: Cargo.toml (-xw-x--x--)

[1.0]

[package]
name = "rsync"
version = "0.1.3"
authors = ["Pierre-Étienne Meunier <pe@pijul.org>"]
description = "Bindings to librsync"
license = "LGPL-3.0"
homepage = "https://nest.pijul.com/pmeunier/rsync"
documentation = "http://docs.rs/rsync"

include = ["src/lib.rs","COPYING.LESSER","Cargo.toml"]

[dependencies]
libc="0.2.2"

[dev-dependencies]
rand="0.3.12"
file addition: COPYING.LESSER (-xw-x--x--)

[1.0]

GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

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As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
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