[pbs-devel] [RFC pxar 7/20] fix #3174: encoder: add helper to incr encoder pos

[Christian Ebner <c.ebner@proxmox.com>]

Adds a helper to allow to increase the encoder position by a given
size. This is used to increase the position when adding an appendix
section to the pxar stream, as these bytes are never encoded directly
but rather referenced by already existing chunks.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 src/encoder/aio.rs  | 5 +++++
 src/encoder/mod.rs  | 6 ++++++
 src/encoder/sync.rs | 5 +++++
 3 files changed, 16 insertions(+)

diff --git a/src/encoder/aio.rs b/src/encoder/aio.rs
index 3b6c900..3587f65 100644
--- a/src/encoder/aio.rs
+++ b/src/encoder/aio.rs
@@ -112,6 +112,11 @@ impl<'a, T: SeqWrite + 'a> Encoder<'a, T> {
         self.inner.finish().await
     }
 
+    /// Add size to encoders position and return new position.
+    pub fn position_add(&mut self, size: u64) -> u64 {
+        self.inner.position_add(size)
+    }
+
     /// Add reference to archive appendix
     pub async fn add_appendix_ref<PF: AsRef<Path>>(
         &mut self,
diff --git a/src/encoder/mod.rs b/src/encoder/mod.rs
index a513ce6..abe21f2 100644
--- a/src/encoder/mod.rs
+++ b/src/encoder/mod.rs
@@ -626,6 +626,12 @@ impl<'a, T: SeqWrite + 'a> EncoderImpl<'a, T> {
         self.state.write_position
     }
 
+    #[inline]
+    pub fn position_add(&mut self, size: u64) -> u64 {
+        self.state.write_position += size;
+        self.state.write_position
+    }
+
     pub async fn create_directory(
         &mut self,
         file_name: &Path,
diff --git a/src/encoder/sync.rs b/src/encoder/sync.rs
index 372ca12..b3d7c44 100644
--- a/src/encoder/sync.rs
+++ b/src/encoder/sync.rs
@@ -110,6 +110,11 @@ impl<'a, T: SeqWrite + 'a> Encoder<'a, T> {
         poll_result_once(self.inner.finish())
     }
 
+    /// Add size to encoders position and return new position.
+    pub fn position_add(&mut self, size: u64) -> u64 {
+        self.inner.position_add(size)
+    }
+
     /// Add reference to archive appendix
     pub async fn add_appendix_ref<PF: AsRef<Path>>(
         &mut self,
-- 
2.39.2