From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/tar/src/pax.rs | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 vendor/tar/src/pax.rs

(limited to 'vendor/tar/src/pax.rs')

diff --git a/vendor/tar/src/pax.rs b/vendor/tar/src/pax.rs
new file mode 100644
index 000000000..80ca3e9b4
--- /dev/null
+++ b/vendor/tar/src/pax.rs
@@ -0,0 +1,117 @@
+use std::io;
+use std::slice;
+use std::str;
+
+use crate::other;
+
+/// An iterator over the pax extensions in an archive entry.
+///
+/// This iterator yields structures which can themselves be parsed into
+/// key/value pairs.
+pub struct PaxExtensions<'entry> {
+    data: slice::Split<'entry, u8, fn(&u8) -> bool>,
+}
+
+impl<'entry> PaxExtensions<'entry> {
+    /// Create new pax extensions iterator from the given entry data.
+    pub fn new(a: &'entry [u8]) -> Self {
+        fn is_newline(a: &u8) -> bool {
+            *a == b'\n'
+        }
+        PaxExtensions {
+            data: a.split(is_newline),
+        }
+    }
+}
+
+/// A key/value pair corresponding to a pax extension.
+pub struct PaxExtension<'entry> {
+    key: &'entry [u8],
+    value: &'entry [u8],
+}
+
+pub fn pax_extensions_size(a: &[u8]) -> Option<u64> {
+    for extension in PaxExtensions::new(a) {
+        let current_extension = match extension {
+            Ok(ext) => ext,
+            Err(_) => return None,
+        };
+        if current_extension.key() != Ok("size") {
+            continue;
+        }
+
+        let value = match current_extension.value() {
+            Ok(value) => value,
+            Err(_) => return None,
+        };
+        let size = match value.parse::<u64>() {
+            Ok(size) => size,
+            Err(_) => return None,
+        };
+        return Some(size);
+    }
+    None
+}
+
+impl<'entry> Iterator for PaxExtensions<'entry> {
+    type Item = io::Result<PaxExtension<'entry>>;
+
+    fn next(&mut self) -> Option<io::Result<PaxExtension<'entry>>> {
+        let line = match self.data.next() {
+            Some(line) if line.is_empty() => return None,
+            Some(line) => line,
+            None => return None,
+        };
+
+        Some(
+            line.iter()
+                .position(|b| *b == b' ')
+                .and_then(|i| {
+                    str::from_utf8(&line[..i])
+                        .ok()
+                        .and_then(|len| len.parse::<usize>().ok().map(|j| (i + 1, j)))
+                })
+                .and_then(|(kvstart, reported_len)| {
+                    if line.len() + 1 == reported_len {
+                        line[kvstart..]
+                            .iter()
+                            .position(|b| *b == b'=')
+                            .map(|equals| (kvstart, equals))
+                    } else {
+                        None
+                    }
+                })
+                .map(|(kvstart, equals)| PaxExtension {
+                    key: &line[kvstart..kvstart + equals],
+                    value: &line[kvstart + equals + 1..],
+                })
+                .ok_or_else(|| other("malformed pax extension")),
+        )
+    }
+}
+
+impl<'entry> PaxExtension<'entry> {
+    /// Returns the key for this key/value pair parsed as a string.
+    ///
+    /// May fail if the key isn't actually utf-8.
+    pub fn key(&self) -> Result<&'entry str, str::Utf8Error> {
+        str::from_utf8(self.key)
+    }
+
+    /// Returns the underlying raw bytes for the key of this key/value pair.
+    pub fn key_bytes(&self) -> &'entry [u8] {
+        self.key
+    }
+
+    /// Returns the value for this key/value pair parsed as a string.
+    ///
+    /// May fail if the value isn't actually utf-8.
+    pub fn value(&self) -> Result<&'entry str, str::Utf8Error> {
+        str::from_utf8(self.value)
+    }
+
+    /// Returns the underlying raw bytes for this value of this key/value pair.
+    pub fn value_bytes(&self) -> &'entry [u8] {
+        self.value
+    }
+}
-- 
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