According to the HACKING file, the file's default language ID is stored
in the database header. Use this value instead of a generic English
language locale for indexing JET4 files.
Columns can have their own text sorting rules, including language ID
distinct from the file's language ID, but this is not addressed as we'd
have to break the mdb_index_hash_text function signature, which I'm not
prepared to do just yet.
There appear to be two bytes after the language ID that may indicate
additional sorting flags. These bytes need additional research.
On FreeBSD 13.0-CURRENT its compiler clang-11.0.0 complains:
index.c:388:14: error: comparison of integers of different signs: 'int' and 'unsigned int' [-Werror,-Wsign-compare]
for (i=0; i<len+1; i++) {
~^~~~~~
There are more modern tools for memory debugging, get rid of DMALLOC
crap in the source code.
I've left one reference in backend.c to prevent a merge conflict but
this can be removed later.
Re-reverse engineered index meta information layout in JET 4
file format, based particularly on jackcess (Java) JET/Access
database library (https://github.com/jahlborn/jackcess), and
hexdumps of JET 4 database index meta information. Based both
on byte counting of jackcess reading of index definitions and
also expected flag values (0x80, 0x89, etc), the flags of JET 4
index definition are 4 bytes later than mdbtools previously thought.
See IndexData.read() and private static class Jet4Format in
src/main/java/com/healthmarketscience/jackcess/impl/IndexData.java
src/main/java/com/healthmarketscience/jackcess/impl/JetFormat.java
in jackcess source for layout reference.
Now appears to get sensible "CREATE INDEX"/"CREATE UNIQUE INDEX"
behaviour on export to PostgreSQL schema.
Also added extensive index definition byte layout reference to top
of src/libmdb/index.c for ease of reference, plus more debugging
assistance (and comments of phases reading index for readability).
make gmdb2 version match mainline code
new dissector for jet4 tdef pages in gmdb2
gmdb2 right mouse click behaviour bugfix
pre-compute index page bitmap in mdb_index_unpack_page() in preparation for index writes.
