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## Walkthrough
A new function, `checkCompressedDataCompatibilityV7`, was introduced to perform compatibility checks specific to version 7 of the compression format. The `DACodecV7` struct now uses this new function instead of the generic compatibility checker. The `checkCompressedDataCompatibility` method gained a `checkLength` flag to control length-based compression validation. The previously unimplemented `CheckChunkCompressedDataCompatibility` was implemented by delegating to batch compatibility checks. Related test cases involving repeated byte patterns were removed from the test suite.
## Changes
| File(s) | Change Summary |
|---------------------------|------------------------------------------------------------------------------------------------------------------|
| encoding/da.go | Added `checkCompressedDataCompatibilityV7` for v7-specific compressed data compatibility checks; updated existing compatibility check to ensure last block marker is set. |
| encoding/codecv7.go | Modified `checkCompressedDataCompatibility` to accept `checkLength` flag and use v7-specific checker; implemented `CheckChunkCompressedDataCompatibility` by delegating to batch check; updated method signatures accordingly. |
| encoding/codecv7_test.go | Removed `repeat` helper and associated repeated byte pattern test cases; updated calls to `checkCompressedDataCompatibility` with new `checkLength` argument. |
## Sequence Diagram(s)
```mermaid
sequenceDiagram
participant User
participant DACodecV7
participant checkCompressedDataCompatibilityV7
User->>DACodecV7: Call checkCompressedDataCompatibility(payloadBytes, checkLength)
DACodecV7->>checkCompressedDataCompatibilityV7: Validate compressed data format
checkCompressedDataCompatibilityV7-->>DACodecV7: Return error or success
DACodecV7->>DACodecV7: If checkLength true, compare compressed vs original length
DACodecV7-->>User: Return compatibility status and possibly compressed dataPossibly related PRs
Suggested reviewers
Poem
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<summary>📥 Commits</summary>
Reviewing files that changed from the base of the PR and between 750488ce7dfdca6036f82a2d430fa13fabba6e84 and feb63c9ee30a92f5f539603fb5c0d275ea290cb3.
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<summary>📒 Files selected for processing (2)</summary>
* `encoding/codecv7.go` (5 hunks)
* `encoding/da.go` (1 hunks)
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<summary>🚧 Files skipped from review as they are similar to previous changes (2)</summary>
* encoding/da.go
* encoding/codecv7.go
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* GitHub Check: tests
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Purpose or design rationale of this PR
For v7 batches, uncompressed cases are resolved. This PR removes the uncompressed case checks and only keeps sanity checks. If sanity check fails, the circuit needs manual fix, and rollup-relayer can still commit uncompressed data.
Some unit tests related to fallback to uncompressed mode are removed in this PR as well.
PR title
Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:
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