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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/bhttp/src/rw.rs
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/bhttp/src/rw.rs')
-rw-r--r--third_party/rust/bhttp/src/rw.rs106
1 files changed, 106 insertions, 0 deletions
diff --git a/third_party/rust/bhttp/src/rw.rs b/third_party/rust/bhttp/src/rw.rs
new file mode 100644
index 0000000000..8fee16daa9
--- /dev/null
+++ b/third_party/rust/bhttp/src/rw.rs
@@ -0,0 +1,106 @@
+use crate::err::Res;
+#[cfg(feature = "read-bhttp")]
+use crate::{err::Error, ReadSeek};
+#[cfg(feature = "read-bhttp")]
+use std::borrow::BorrowMut;
+use std::{convert::TryFrom, io};
+
+#[cfg(feature = "write-bhttp")]
+#[allow(clippy::cast_possible_truncation)]
+fn write_uint(n: u8, v: impl Into<u64>, w: &mut impl io::Write) -> Res<()> {
+ let v = v.into();
+ assert!(n > 0 && usize::from(n) < std::mem::size_of::<u64>());
+ for i in 0..n {
+ w.write_all(&[((v >> (8 * (n - i - 1))) & 0xff) as u8])?;
+ }
+ Ok(())
+}
+
+#[cfg(feature = "write-bhttp")]
+pub fn write_varint(v: impl Into<u64>, w: &mut impl io::Write) -> Res<()> {
+ let v = v.into();
+ match () {
+ _ if v < (1 << 6) => write_uint(1, v, w),
+ _ if v < (1 << 14) => write_uint(2, v | (1 << 14), w),
+ _ if v < (1 << 30) => write_uint(4, v | (2 << 30), w),
+ _ if v < (1 << 62) => write_uint(8, v | (3 << 62), w),
+ _ => panic!("Varint value too large"),
+ }
+}
+
+#[cfg(feature = "write-bhttp")]
+pub fn write_len(len: usize, w: &mut impl io::Write) -> Res<()> {
+ write_varint(u64::try_from(len).unwrap(), w)
+}
+
+#[cfg(feature = "write-bhttp")]
+pub fn write_vec(v: &[u8], w: &mut impl io::Write) -> Res<()> {
+ write_len(v.len(), w)?;
+ w.write_all(v)?;
+ Ok(())
+}
+
+#[cfg(feature = "read-bhttp")]
+fn read_uint<T, R>(n: usize, r: &mut T) -> Res<Option<u64>>
+where
+ T: BorrowMut<R> + ?Sized,
+ R: ReadSeek + ?Sized,
+{
+ let mut buf = [0; 7];
+ let count = r.borrow_mut().read(&mut buf[..n])?;
+ if count == 0 {
+ return Ok(None);
+ } else if count < n {
+ return Err(Error::Truncated);
+ }
+ let mut v = 0;
+ for i in &buf[..n] {
+ v = (v << 8) | u64::from(*i);
+ }
+ Ok(Some(v))
+}
+
+#[cfg(feature = "read-bhttp")]
+pub fn read_varint<T, R>(r: &mut T) -> Res<Option<u64>>
+where
+ T: BorrowMut<R> + ?Sized,
+ R: ReadSeek + ?Sized,
+{
+ if let Some(b1) = read_uint(1, r)? {
+ Ok(Some(match b1 >> 6 {
+ 0 => b1 & 0x3f,
+ 1 => ((b1 & 0x3f) << 8) | read_uint(1, r)?.ok_or(Error::Truncated)?,
+ 2 => ((b1 & 0x3f) << 24) | read_uint(3, r)?.ok_or(Error::Truncated)?,
+ 3 => ((b1 & 0x3f) << 56) | read_uint(7, r)?.ok_or(Error::Truncated)?,
+ _ => unreachable!(),
+ }))
+ } else {
+ Ok(None)
+ }
+}
+
+#[cfg(feature = "read-bhttp")]
+pub fn read_vec<T, R>(r: &mut T) -> Res<Option<Vec<u8>>>
+where
+ T: BorrowMut<R> + ?Sized,
+ R: ReadSeek + ?Sized,
+{
+ use std::io::SeekFrom;
+
+ if let Some(len) = read_varint(r)? {
+ // Check that the input contains enough data. Before allocating.
+ let r = r.borrow_mut();
+ let pos = r.stream_position()?;
+ let end = r.seek(SeekFrom::End(0))?;
+ if end - pos < len {
+ return Err(Error::Truncated);
+ }
+ let _ = r.seek(SeekFrom::Start(pos))?;
+
+ let mut v = vec![0; usize::try_from(len)?];
+ r.read_exact(&mut v)?;
+ Ok(Some(v))
+ } else {
+ Ok(None)
+ }
+}