also I don't think that returning a
String error is very idiomatic
Actually if what you want is a buffered reader:
use std::path::Path;
use std::io;
// do you really need this lifetime to be 'static ??
fn file_digest(digest_alg: &'static digest::Algorithm, file_path: &Path) -> io::Result<Digest> {
let mut file = try!(io::File::open(file_path));
let mut reader = BufReader::with_capacity(capacity, file);
let mut ctx = digest::Context::new(digest_alg);
for byte in reader.bytes() {
ctx.update(try!(byte));
}
Ok(ctx.finish())
}Also, your digest stuff could directly take an Iterator over bytes ?
If you want you can still format your Strings from the Err afterwards
my final version (hoping I have not completly diverged from what your code was about xD) would be something like:
use std::path::Path;
use std::io;
fn file_digest(digest_alg: &digest::Algorithm, file_path: &Path) -> io::Result<Digest> {
let mut file = try!(io::File::open(file_path));
let mut reader = io::BufReader::with_capacity(capacity, file);
try!(bytes_digest(digest_alg, reader.bytes()))
}
Ow, first occurrence: https://doc.rust-lang.org/stable/std/primitive.str.html#method.splitn
Seems SynchronousStreamCipher is what I want, but there is only a method named "process" to do encrypt and I can't find the method which do decrypt
@loggerhead , are you sure you're about correct semantics here? It seems to me that this trait is more about stream ciphers(https://en.wikipedia.org/wiki/Stream_cipher), but not about encrypting stream data
Anyways since stream ciphers are using xor, the decrypt operation is repeating of encrypt operation on encrypted data.
Oh, thank you very much! I have been stuck at finding a way to decrypt stream data because of my ignorant of the working principle.
hi all, I am working on a concurrent ping program (send ping to multiple hosts at the same time). I got the basic - send/receive icmp packets for now. I am trying to make this async using mioco lib. But being new to concurrent programming, I am stuck. https://gist.github.com/ironpillow/d64f644fc42a05c2bcb5e4a3dff84815
hi all, I'm using manual(https://doc.rust-lang.org/book) for studying rust but I'm stuck on https://doc.rust-lang.org/book/crates-and-modules.html#exporting-a-public-interface. It doesnt compile with message:
Compiling phrases v0.1.0 (file:///D:/rust/phrases)
src\main.rs:7:38: 7:54 error: unresolved name `greetings::hello` [E0425]
src\main.rs:7 println!("Hello in English: {}", greetings::hello());
^~~~~~~~~~~~~~~~
<std macros>:2:27: 2:58 note: in this expansion of format_args!
<std macros>:3:1: 3:54 note: in this expansion of print! (defined in <std macros>)
src\main.rs:7:5: 7:58 note: in this expansion of println! (defined in <std macros>)
src\main.rs:7:38: 7:54 help: run `rustc --explain E0425` to see a detailed explanation
src\main.rs:8:40: 8:58 error: unresolved name `farewells::goodbye` [E0425]
src\main.rs:8 println!("Goodbye in English: {}", farewells::goodbye());
^~~~~~~~~~~~~~~~~~
<std macros>:2:27: 2:58 note: in this expansion of format_args!
<std macros>:3:1: 3:54 note: in this expansion of print! (defined in <std macros>)
src\main.rs:8:5: 8:62 note: in this expansion of println! (defined in <std macros>)
src\main.rs:8:40: 8:58 help: run `rustc --explain E0425` to see a detailed explanation
error: aborting due to 2 previous errors
error: Could not compile `phrases`.is it an error in manual or I'm doing something wrong?
You can press on the website(go with the mouse over the code in the website) on the "Run" button. It will open up the playground with all the code that is needed to compile
For demonstration purposes the code is cut in smaller pieces, so if you take a small piece, it won't compile by itself.
If the modules are internal, than you are probably missing
mod greetings;
mod farewells;
No, to solve your problem you need to go through all the next steps the example mentiones
And then compile
If you are still blocked, put it on a pastebin or https://gist.github.com/
It always has known size
https://stackoverflow.com/questions/30938499/why-is-sized-bound-necessary-in-this-trait#30941589 here's long explanation
@j2ko <thumb-up> But this is not what I need.
@Albibek I understood.
Also I can't declare
I found one solution. I'll implement this function in trait implementations. Where I would know that Self: Sized. And I would use it for conversion.
@Albibek I understood.
Also I can't declare
trait X: Sized {...}. and make trait-objects &XI found one solution. I'll implement this function in trait implementations. Where I would know that Self: Sized. And I would use it for conversion.