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feat(dCommon): read cdclient.fdb in place through its hash buckets

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FdbMappedFile maps a file read-only (CreateFileMapping/MapViewOfFile on
Windows, mmap elsewhere) and falls back to reading it into memory when
mapping fails. FdbReader reads the table and column headers from it and
looks rows up by their first column through the fdb's own buckets,
decoding every integer as little-endian with bounds checks, so the rows
never get copied out of the file.

Tests write small fdb files (collisions, text, int64, nulls) and read
them both mapped and from memory.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 21:56:18 -05:00
parent 94b411a32e
commit d670484b68
8 changed files with 1020 additions and 0 deletions
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2
dCommon/CMakeLists.txt
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@@ -19,6 +19,8 @@ set(DCOMMON_SOURCES
"BrickByBrickFix.cpp"
"BinaryPathFinder.cpp"
"FdbToSqlite.cpp"
"FdbMappedFile.cpp"
"FdbReader.cpp"
"JSONUtils.cpp"
"TinyXmlUtils.cpp"
"Sd0.cpp"