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Subject: [pbs-devel] [PATCH v7 pxar 02/69] lib: add type for input/output
variant differentiation
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Introduce an enum which stores 2 different possible variants of
inputs or outputs to be passed to encoder and decoder/accessor
instances, depending whether to read/write a fully self contained
pxar archive or whether to split off the payload stream into a
separate input/output.
Co-authored-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
changes since version 6:
- not present in previous version
src/lib.rs | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/src/lib.rs b/src/lib.rs
index 210c4b1..f784c9e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -494,3 +494,65 @@ impl Entry {
}
}
}
+
+#[derive(Clone)]
+/// Possible variants of the encoder output and decoder as well as accessor inputs
+///
+/// Allow to have a unified or split input/output, depending on whether this is a split
+/// archive or not.
+pub enum PxarVariant<A, P> {
+ /// All of the pxar archive is contained within the given input/output
+ Unified(A),
+ /// Metadata and payload are split into separate inputs/outputs
+ Split(A, P),
+}
+
+impl<A, P> PxarVariant<A, P> {
+ pub fn archive(&self) -> &A {
+ match self {
+ PxarVariant::Unified(a) => a,
+ PxarVariant::Split(a, _) => a,
+ }
+ }
+
+ pub fn archive_mut(&mut self) -> &mut A {
+ match self {
+ PxarVariant::Unified(a) => a,
+ PxarVariant::Split(a, _) => a,
+ }
+ }
+
+ pub fn payload(&self) -> Option<&P> {
+ match self {
+ PxarVariant::Unified(_) => None,
+ PxarVariant::Split(_, p) => Some(p),
+ }
+ }
+
+ pub fn payload_mut(&mut self) -> Option<&mut P> {
+ match self {
+ PxarVariant::Unified(_) => None,
+ PxarVariant::Split(_, p) => Some(p),
+ }
+ }
+
+ pub fn wrap_multi<OUT1, OUT2, F1: Fn(A) -> OUT1, F2: Fn(P) -> OUT2>(
+ self,
+ f1: F1,
+ f2: F2,
+ ) -> PxarVariant<OUT1, OUT2> {
+ match self {
+ PxarVariant::Unified(a) => PxarVariant::Unified(f1(a)),
+ PxarVariant::Split(a, p) => PxarVariant::Split(f1(a), f2(p)),
+ }
+ }
+}
+
+impl<IN> PxarVariant<IN, IN> {
+ pub fn wrap<OUT, F: Fn(IN) -> OUT>(self, f: F) -> PxarVariant<OUT, OUT> {
+ match self {
+ PxarVariant::Unified(a) => PxarVariant::Unified(f(a)),
+ PxarVariant::Split(a, p) => PxarVariant::Split(f(a), f(p)),
+ }
+ }
+}
--
2.39.2
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