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From: Christian Ebner <c.ebner@proxmox.com>
To: pbs-devel@lists.proxmox.com
Date: Fri, 22 Sep 2023 09:16:05 +0200
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Subject: [pbs-devel] [RFC pxar 4/20] fix #3174: metadata: impl fn to calc
byte size
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Add a helper function to calculate the byte size of pxar Metadata
objects, needed to be able to recalculate offsets when creating archives
with appendix sections.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
src/lib.rs | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/src/lib.rs b/src/lib.rs
index 210c4b1..ed7ba40 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -144,6 +144,50 @@ impl Metadata {
pub fn builder_from_stat(stat: &libc::stat) -> MetadataBuilder {
MetadataBuilder::new(0).fill_from_stat(stat)
}
+
+ /// Calculate the number of bytes when serialized in pxar archive
+ pub fn calculate_byte_len(&self) -> usize {
+ let mut bytes = mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(&self.stat);
+ for xattr in &self.xattrs {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(xattr);
+ }
+ for acl_user in &self.acl.users {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(acl_user);
+ }
+ for acl_group in &self.acl.groups {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(acl_group);
+ }
+ if let Some(group_obj) = &self.acl.group_obj {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(group_obj);
+ }
+ if let Some(default) = &self.acl.default {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(default);
+ }
+ for acl_default_user in &self.acl.default_users {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(acl_default_user);
+ }
+ for acl_default_group in &self.acl.default_groups {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(acl_default_group);
+ }
+ if let Some(fcaps) = &self.fcaps {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(fcaps);
+ }
+ if let Some(quota_project_id) = &self.quota_project_id {
+ bytes += mem::size_of::<format::Header>();
+ bytes += mem::size_of_val(quota_project_id);
+ }
+
+ bytes
+ }
}
impl From<MetadataBuilder> for Metadata {
--
2.39.2