no_std + alloc crate

algesten · algesten · commit a9a9a63b1c0c · 2024-11-28T21:25:43.000+01:00
diff --git a/src/body.rs b/src/body.rs
@@ -1,5 +1,6 @@
-use std::fmt;
-use std::io::Write;
+use alloc::string::ToString;
+use core::fmt;
+use core::fmt::Write;
 
 use http::{HeaderName, HeaderValue, Method};
 
diff --git a/src/chunk.rs b/src/chunk.rs
@@ -178,6 +178,8 @@ impl Dechunker {
 
 #[cfg(test)]
 mod test {
+    use alloc::string::String;
+
     use super::*;
 
     #[test]
diff --git a/src/client/amended.rs b/src/client/amended.rs
@@ -1,4 +1,5 @@
-use std::mem;
+use alloc::string::ToString;
+use core::mem;
 
 use http::{HeaderMap, HeaderName, HeaderValue, Method, Request, Uri, Version};
 use url::Url;
@@ -143,7 +144,7 @@ impl<Body> AmendedRequest<Body> {
     }
 
     #[cfg(test)]
-    pub fn headers_vec(&self) -> Vec<(&str, &str)> {
+    pub fn headers_vec(&self) -> alloc::vec::Vec<(&str, &str)> {
         self.headers()
             // unwrap here is ok because the tests using this method should
             // only use header values representable as utf-8.
diff --git a/src/client/call.rs b/src/client/call.rs
@@ -1,8 +1,9 @@
 //! A single request-response. No redirection or other logic.
 
-use std::fmt;
-use std::io::Write;
-use std::marker::PhantomData;
+use alloc::string::ToString;
+use core::fmt;
+use core::fmt::Write;
+use core::marker::PhantomData;
 
 use http::{HeaderName, HeaderValue, Method, Request, Response, StatusCode, Version};
 
@@ -643,7 +644,8 @@ impl fmt::Debug for Phase {
 mod test {
     use super::*;
 
-    use std::str;
+    use alloc::vec;
+    use core::str;
 
     use http::{Method, Request};
 
diff --git a/src/client/flow.rs b/src/client/flow.rs
@@ -1,12 +1,13 @@
 //! A sequence of calls, such as following redirects.
 
-use std::fmt;
-use std::marker::PhantomData;
+use alloc::string::String;
+use alloc::string::ToString;
+use core::fmt;
+use core::marker::PhantomData;
 
 use http::uri::Scheme;
-use http::{
-    HeaderMap, HeaderName, HeaderValue, Method, Request, Response, StatusCode, Uri, Version,
-};
+use http::{HeaderMap, HeaderName, HeaderValue, Method, Request};
+use http::{Response, StatusCode, Uri, Version};
 
 use crate::body::calculate_max_input;
 use crate::ext::{HeaderIterExt, MethodExt, StatusExt};
diff --git a/src/client/holder.rs b/src/client/holder.rs
@@ -1,4 +1,4 @@
-use std::mem;
+use core::mem;
 
 use http::Request;
 
diff --git a/src/client/test/mod.rs b/src/client/test/mod.rs
@@ -22,6 +22,6 @@ trait TestSliceExt {
 
 impl TestSliceExt for [u8] {
     fn as_str(&self) -> &str {
-        std::str::from_utf8(self).unwrap()
+        core::str::from_utf8(self).unwrap()
     }
 }
diff --git a/src/client/test/scenario.rs b/src/client/test/scenario.rs
@@ -1,5 +1,14 @@
-use std::io::Write;
-use std::marker::PhantomData;
+use core::fmt::Write;
+// use std::io::Write;
+use core::marker::PhantomData;
+
+// use std::prelude::rust_2021::*;
+// use std::vec;
+
+use alloc::string::String;
+use alloc::string::ToString;
+use alloc::vec;
+use alloc::vec::Vec;
 
 use http::{Method, Request, Response, StatusCode};
 
@@ -8,6 +17,7 @@ use crate::client::flow::state::{
 };
 use crate::client::flow::{Await100Result, Flow, SendRequestResult};
 use crate::client::flow::{RecvBodyResult, RecvResponseResult};
+use crate::util::Writer;
 
 pub struct Scenario {
     request: Request<()>,
@@ -176,12 +186,13 @@ impl Scenario {
 }
 
 pub fn write_response(r: &Response<()>) -> Vec<u8> {
-    let mut input = Vec::<u8>::new();
+    let mut input = vec![0; 1024];
+    let mut w = Writer::new(&mut input);
 
     let s = r.status();
 
     write!(
-        &mut input,
+        &mut w,
         "{:?} {} {}\r\n",
         r.version(),
         s.as_u16(),
@@ -190,10 +201,15 @@ pub fn write_response(r: &Response<()>) -> Vec<u8> {
     .unwrap();
 
     for (k, v) in r.headers().iter() {
-        write!(&mut input, "{}: {}\r\n", k.as_str(), v.to_str().unwrap()).unwrap();
+        write!(&mut w, "{}: {}\r\n", k.as_str(), v.to_str().unwrap()).unwrap();
     }
 
-    write!(&mut input, "\r\n").unwrap();
+    write!(&mut w, "\r\n").unwrap();
+
+    let len = w.len();
+
+    drop(w);
+    input.truncate(len);
 
     input
 }
diff --git a/src/client/test/state_recv_body.rs b/src/client/test/state_recv_body.rs
@@ -1,3 +1,5 @@
+use alloc::vec;
+
 use http::Response;
 
 use crate::client::flow::CloseReason;
diff --git a/src/client/test/state_redirect.rs b/src/client/test/state_redirect.rs
@@ -1,3 +1,6 @@
+use alloc::string::ToString;
+use alloc::vec;
+
 use http::{Method, Response, StatusCode};
 
 use crate::client::flow::RedirectAuthHeaders;
diff --git a/src/client/test/state_send_body.rs b/src/client/test/state_send_body.rs
@@ -1,3 +1,5 @@
+use alloc::vec;
+
 use crate::client::flow::SendRequestResult;
 
 use super::scenario::Scenario;
diff --git a/src/client/test/state_send_request.rs b/src/client/test/state_send_request.rs
@@ -1,3 +1,5 @@
+use alloc::vec;
+
 use crate::client::flow::SendRequestResult;
 use crate::Error;
 
diff --git a/src/error.rs b/src/error.rs
@@ -1,4 +1,6 @@
-use std::fmt;
+use alloc::string::String;
+use alloc::string::ToString;
+use core::fmt;
 
 use http::{Method, Version};
 
@@ -42,7 +44,7 @@ impl From<httparse::Error> for Error {
     }
 }
 
-impl std::error::Error for Error {}
+impl core::error::Error for Error {}
 
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
diff --git a/src/lib.rs b/src/lib.rs
@@ -4,11 +4,15 @@
 //!
 //!
 
+#![no_std]
 #![forbid(unsafe_code)]
 #![warn(clippy::all)]
 #![allow(clippy::uninlined_format_args)]
+#![allow(clippy::needless_lifetimes)]
 #![deny(missing_docs)]
 
+extern crate alloc;
+
 #[macro_use]
 extern crate log;
 
diff --git a/src/util.rs b/src/util.rs
@@ -1,6 +1,5 @@
-use std::fmt;
-use std::io::{self, Cursor};
-use std::ops::{Deref, DerefMut};
+use core::fmt;
+use core::ops::{Deref, DerefMut};
 
 pub(crate) fn find_crlf(b: &[u8]) -> Option<usize> {
     let cr = b.iter().position(|c| *c == b'\r')?;
@@ -30,38 +29,56 @@ pub(crate) fn compare_lowercase_ascii(a: &str, lowercased: &str) -> bool {
     true
 }
 
-pub(crate) struct Writer<'a>(pub Cursor<&'a mut [u8]>);
+pub(crate) struct Writer<'a>(&'a mut [u8], usize);
 
 impl<'a> Writer<'a> {
     pub(crate) fn new(output: &'a mut [u8]) -> Writer<'a> {
-        Self(Cursor::new(output))
+        Self(output, 0)
     }
 
-    pub fn len(&self) -> usize {
-        self.0.position() as usize
+    #[inline(always)]
+    pub(crate) fn len(&self) -> usize {
+        self.1
     }
 
-    pub fn available(&self) -> usize {
-        self.0.get_ref().len() - self.len()
+    #[inline(always)]
+    pub(crate) fn available(&self) -> usize {
+        self.0.len() - self.1
     }
 
-    pub(crate) fn try_write(&mut self, block: impl Fn(&mut Self) -> io::Result<()>) -> bool {
-        let pos = self.0.position();
+    pub(crate) fn try_write(
+        &mut self,
+        block: impl Fn(&mut Self) -> Result<(), fmt::Error>,
+    ) -> bool {
+        let pos = self.1;
         let success = (block)(self).is_ok();
         if !success {
-            self.0.set_position(pos);
+            self.1 = pos;
         }
         success
     }
-}
 
-impl<'a> io::Write for Writer<'a> {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
+    #[inline(always)]
+    pub(crate) fn write_all(&mut self, to_write: &[u8]) -> Result<(), fmt::Error> {
+        let len = to_write.len();
+
+        if len > self.available() {
+            return Err(fmt::Error);
+        }
+
+        let buf = &mut self.0[self.1..];
+        buf[..len].copy_from_slice(to_write);
+
+        self.1 += len;
+
+        Ok(())
     }
+}
 
-    fn flush(&mut self) -> io::Result<()> {
-        self.0.flush()
+impl<'a> fmt::Write for Writer<'a> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        let bytes = s.as_bytes();
+        self.write_all(bytes)
     }
 }
 
@@ -70,7 +87,7 @@ const CHARS_PER_ROW: usize = 16;
 impl<'a> Drop for Writer<'a> {
     fn drop(&mut self) {
         let len = self.len();
-        log_data(&self.0.get_ref()[..len]);
+        log_data(&self.0[..len]);
     }
 }
 
@@ -156,7 +173,7 @@ impl<T, const N: usize> ArrayVec<T, N> {
     pub fn from_fn(cb: impl FnMut(usize) -> T) -> Self {
         Self {
             len: 0,
-            arr: std::array::from_fn(cb),
+            arr: core::array::from_fn(cb),
         }
     }
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-use std::mem;`
	`1`	`+use core::mem;`
`2`	`2`
`3`	`3`	`use http::Request;`
`4`	`4`
Original file line number	Diff line number	Diff line change
`@@ -22,6 +22,6 @@ trait TestSliceExt {`
`22`	`22`
`23`	`23`	`impl TestSliceExt for [u8] {`
`24`	`24`	`fn as_str(&self) -> &str {`
`25`		`- std::str::from_utf8(self).unwrap()`
	`25`	`+ core::str::from_utf8(self).unwrap()`
`26`	`26`	`}`
`27`	`27`	`}`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+use alloc::vec;`
	`2`	`+`
`1`	`3`	`use http::Response;`
`2`	`4`
`3`	`5`	`use crate::client::flow::CloseReason;`