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From: Dominik Csapak <d.csapak@proxmox.com>
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Date: Thu, 8 Aug 2024 10:18:25 +0200
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Subject: [pbs-devel] [PATCH proxmox-backup] data_blob: add TODO comment for
zstd api
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we currently use the behavior of zstd that is not part of the public
api, so this is at risk to be changed without notice.
There is a public api that we could use, but it's only available
with zstd_sys >= 2.0.9, which at this time, is not yet packaged for/by
us.
Add a comment that we can use the public api for this when the
new version of the crate gets available.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
after looking whom to report that the api would benefit from better
error handling, i noticed that zstd_sys already has what we need, but
only in a newer version, which we currently don't package
pbs-datastore/src/data_blob.rs | 2 ++
1 file changed, 2 insertions(+)
diff --git a/pbs-datastore/src/data_blob.rs b/pbs-datastore/src/data_blob.rs
index fd84f4be..0fb4d44c 100644
--- a/pbs-datastore/src/data_blob.rs
+++ b/pbs-datastore/src/data_blob.rs
@@ -556,6 +556,8 @@ impl<'a, 'b> DataChunkBuilder<'a, 'b> {
///
/// There is a test below to ensure we catch any change in the interface or internal value.
fn zstd_error_is_target_too_small(err: usize) -> bool {
+ // TODO: when zstd_sys >= 2.0.9 is available, we can use
+ // ZSTD_getErrorCode and the enum to use the public zstd API
let (real_code, _) = 0usize.overflowing_sub(err);
// see ZSTD_ErrorCode in https://github.com/facebook/zstd/blob/dev/lib/zstd_errors.h
real_code == 70 // ZSTD_error_dstSize_tooSmall
--
2.39.2
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