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babce11705
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/15396 ## Summary `ParseEntry()` exposes the components of an internal key, but constructing one with a chosen sequence number and entry type currently requires private RocksDB utilities or duplicating the encoding. Add public `EncodeEntry()` to construct a stored internal key from `ParsedEntryInfo`, including its user key, timestamp, sequence number, and entry type. Also expose `PackSequenceAndType()` and `UnPackSequenceAndType()` to work with the sequence/type footer as a `uint64_t`. The helpers map all nine representable public entry types to their internal types and use the existing footer encoding; `EncodeEntry()` reuses the public packer. Packing `kEntryOther` or a sequence number above the 56-bit limit returns `InvalidArgument` without changing the output. Unpacking reports internal value types without a public equivalent as `kEntryOther`. Timestamp size remains the caller's responsibility, and input slices must not alias the output string. These are additive C++ utilities using the existing internal-key format. Reviewed By: anand1976, xingbowang Differential Revision: D125082298 fbshipit-source-id: 6c09a31695f1d377b9cc208fa5b6edd3ad6638e2