Add the SQLITE_DEFAULT_DEFENSIVE compile-time option. Fix up test cases
so that they work with DEFENSIVE enabled.

FossilOrigin-Name: 3212733cb6d1a59516d67a86df7c7b1d2456a1b2e5d7080c26b0e87b2609c65d

Many test cases fixed to work with encryption.

FossilOrigin-Name: d866fffb8b1af5003a8730ce7029d1edddb24d46

From test scripts, remove stray "breakpoint" commands and blank lines
at the ends of files.

FossilOrigin-Name: a6b35273239669189f33402144f58328b133d182

Fix corner cases involving corrupt varint values in record headers.

FossilOrigin-Name: 3189116b42c5ecef5e30c8b317f4458bbf8b9086

Update test cases in corruptI.test so that they work with both SQLITE_ENABLE_OVERSIZE_CELL_CHECK and SQLITE_DEFAULT_AUTOVACUUM builds.

FossilOrigin-Name: 22a14663782312fa7f4f18545509ef4b27e9b8c1

Return SQLITE_CORRUPT to the user if an attempt is made to add database page 1 to the free page list.

FossilOrigin-Name: 68876003f922635737349f55bc73a78891ea7028

Have the b-tree layer return SQLITE_CORRUPT to any attempt to open a cursor with a root page number less than 1.

FossilOrigin-Name: aa18c8e9d1676b1caa53bc5f5c1dc5f201089b88

Fix a couple of btree asserts that would fail when encountering 32-bit rollover in cell payload size fields (cell payloads this large always indicate corruption).

FossilOrigin-Name: 8fa0937a2f3476dd

Fix a couple of btree asserts that would fail when encountering 32-bit rollover in cell payload size fields (cell payloads this large always indicate corruption).

FossilOrigin-Name: 8fa0937a2f3476dd280259e252d6f422c33d38ee

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Fix a case where database corruption may cause SQLite to write past the end of a buffer.

FossilOrigin-Name: 97806a78142b15f89878e25ee70dc5b0524d6793

Fix an assert() in btree routine freeSpace() that may be false if the database is corrupt.

FossilOrigin-Name: 00a473c56188cd60a74559effb114140e3fe8a8d

Fix the corruptI.test script so that it works with
SQLITE_ENABLE_OVERSIZE_CELL_CHECK and with SQLITE_DEFAULT_AUTOVACUUM=1.

FossilOrigin-Name: e405b9e4a9ef322d84b20e902234b4f6aa196b1b

Fix an assert that can fail if the database file is corrupted.

FossilOrigin-Name: 3f45b8192dad7fb1f027cbaa694046e3c1b3e278

Enhance the sqlite3VdbeRecordCompare() routines so that if they encounter
database corruption, they will set the UnpackedRecord.isCorrupt field and
return 0. The sqlite3BtreeMovetoUnpacked() routine

Enhance the sqlite3VdbeRecordCompare() routines so that if they encounter
database corruption, they will set the UnpackedRecord.isCorrupt field and
return 0. The sqlite3BtreeMovetoUnpacked() routine detects this and returns
SQLITE_CORRUPT, causing the corruption to be reported back to the top-level.

FossilOrigin-Name: 7fa85eaaaf6d211378620d728a759fdfe30a15b0

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Add an extra test case for the potential buffer overread patched by [28ddecff04].

FossilOrigin-Name: f585f5d7a0f9bf8c590388654a3638231eba8892

Add a test case to verify that the previous change avoids excess buffer
overread in sqlite3VdbeRecordCompare().

FossilOrigin-Name: 2b28e8d582cf10936fa1faca04a16ca2eeead66f

Earlier detection of corruption in sqlite3VdbeRecordCompare() in order to
avoid a potential buffer overread.

FossilOrigin-Name: 28ddecff044dbc2dff50a7d8406ab67dfe06587f

Do not run corruptI.test with the mmap permutation.

FossilOrigin-Name: 378b290da85cadc1acba081322d1f0e8d7694e17

Avoid a buffer overread in vdbeCompareRecordInt() that might occur if the database is corrupt.

FossilOrigin-Name: 7c0b4381f0e6f33cb13299a915851d9431bf3850