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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
| commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
| tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /third_party/rust/generic-array/src/hex.rs | |
| parent | Initial commit. (diff) | |
| download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip | |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/generic-array/src/hex.rs')
| -rw-r--r-- | third_party/rust/generic-array/src/hex.rs | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/third_party/rust/generic-array/src/hex.rs b/third_party/rust/generic-array/src/hex.rs new file mode 100644 index 0000000000..09a6608e37 --- /dev/null +++ b/third_party/rust/generic-array/src/hex.rs @@ -0,0 +1,102 @@ +//! Generic array are commonly used as a return value for hash digests, so
+//! it's a good idea to allow to hexlify them easily. This module implements
+//! `std::fmt::LowerHex` and `std::fmt::UpperHex` traits.
+//!
+//! Example:
+//!
+//! ```rust
+//! # #[macro_use]
+//! # extern crate generic_array;
+//! # extern crate typenum;
+//! # fn main() {
+//! let array = arr![u8; 10, 20, 30];
+//! assert_eq!(format!("{:x}", array), "0a141e");
+//! # }
+//! ```
+//!
+
+use {ArrayLength, GenericArray};
+use core::cmp::min;
+use core::fmt;
+use core::ops::Add;
+use core::str;
+use typenum::*;
+
+static LOWER_CHARS: &'static [u8] = b"0123456789abcdef";
+static UPPER_CHARS: &'static [u8] = b"0123456789ABCDEF";
+
+impl<T: ArrayLength<u8>> fmt::LowerHex for GenericArray<u8, T>
+where
+ T: Add<T>,
+ <T as Add<T>>::Output: ArrayLength<u8>,
+{
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let max_digits = f.precision().unwrap_or_else(|| self.len() * 2);
+ let max_hex = (max_digits >> 1) + (max_digits & 1);
+
+ if T::to_usize() < 1024 {
+ // For small arrays use a stack allocated
+ // buffer of 2x number of bytes
+ let mut res = GenericArray::<u8, Sum<T, T>>::default();
+
+ for (i, c) in self.iter().take(max_hex).enumerate() {
+ res[i * 2] = LOWER_CHARS[(c >> 4) as usize];
+ res[i * 2 + 1] = LOWER_CHARS[(c & 0xF) as usize];
+ }
+ f.write_str(unsafe { str::from_utf8_unchecked(&res[..max_digits]) })?;
+ } else {
+ // For large array use chunks of up to 1024 bytes (2048 hex chars)
+ let mut buf = [0u8; 2048];
+ let mut digits_left = max_digits;
+
+ for chunk in self[..max_hex].chunks(1024) {
+ for (i, c) in chunk.iter().enumerate() {
+ buf[i * 2] = LOWER_CHARS[(c >> 4) as usize];
+ buf[i * 2 + 1] = LOWER_CHARS[(c & 0xF) as usize];
+ }
+ let n = min(chunk.len() * 2, digits_left);
+ f.write_str(unsafe { str::from_utf8_unchecked(&buf[..n]) })?;
+ digits_left -= n;
+ }
+ }
+ Ok(())
+ }
+}
+
+impl<T: ArrayLength<u8>> fmt::UpperHex for GenericArray<u8, T>
+where
+ T: Add<T>,
+ <T as Add<T>>::Output: ArrayLength<u8>,
+{
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let max_digits = f.precision().unwrap_or_else(|| self.len() * 2);
+ let max_hex = (max_digits >> 1) + (max_digits & 1);
+
+ if T::to_usize() < 1024 {
+ // For small arrays use a stack allocated
+ // buffer of 2x number of bytes
+ let mut res = GenericArray::<u8, Sum<T, T>>::default();
+
+ for (i, c) in self.iter().take(max_hex).enumerate() {
+ res[i * 2] = UPPER_CHARS[(c >> 4) as usize];
+ res[i * 2 + 1] = UPPER_CHARS[(c & 0xF) as usize];
+ }
+ f.write_str(unsafe { str::from_utf8_unchecked(&res[..max_digits]) })?;
+ } else {
+ // For large array use chunks of up to 1024 bytes (2048 hex chars)
+ let mut buf = [0u8; 2048];
+ let mut digits_left = max_digits;
+
+ for chunk in self[..max_hex].chunks(1024) {
+ for (i, c) in chunk.iter().enumerate() {
+ buf[i * 2] = UPPER_CHARS[(c >> 4) as usize];
+ buf[i * 2 + 1] = UPPER_CHARS[(c & 0xF) as usize];
+ }
+ let n = min(chunk.len() * 2, digits_left);
+ f.write_str(unsafe { str::from_utf8_unchecked(&buf[..n]) })?;
+ digits_left -= n;
+ }
+ }
+ Ok(())
+ }
+}
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