A different approach to preventing buffer overreads when comparing a vector

of values with a corrupt index record that spans at least one overflow page.

FossilOrigin-Name: 95eaa49f4ee071c7a0f690a695f1f2d1ebca68a8

diff --cc manifest
index 254c420c1a05d892ecf6f5a715683fee27497dc4,de1ca7c5d74c56fa8b90ac40086810b129ee5aa2..0cd62a654290af734d70aeecc861d835bb8c94a8
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,7 -1,7 +1,7 @@@
- C Disallow\sthe\suse\sof\s"rowid"\sin\sCTEs\s-\sit\shas\snever\sworked\scorrectly\sand\sit\nmakes\sno\ssense,\sso\swe\smight\sas\swell\smake\sit\san\sexplicit\serror.\nAlso:\sadd\sthe\sPRAGMA\scell_size_check=ON\scommand.
- D 2015-05-27T15:10:20.505
 -C A\sdifferent\sapproach\sto\spreventing\sbuffer\soverreads\swhen\scomparing\sa\svector\sof\svalues\swith\sa\scorrupt\sindex\srecord\sthat\sspans\sat\sleast\sone\soverflow\spage.
 -D 2015-05-27T14:21:05.738
++C A\sdifferent\sapproach\sto\spreventing\sbuffer\soverreads\swhen\scomparing\sa\svector\nof\svalues\swith\sa\scorrupt\sindex\srecord\sthat\sspans\sat\sleast\sone\soverflow\spage.
++D 2015-05-27T15:42:53.434
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 -F Makefile.in 3feb7cbdad8898fe7a8a24355b4a753029c3ec3b
 +F Makefile.in afc69c576d95c25380e973496434be5f85204fa7
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
  F Makefile.msc d37d2c2323df3acae6e24c71a478889421c17264
  F Makefile.vxworks e1b65dea203f054e71653415bd8f96dcaed47858
@@@ -192,10 -192,10 +192,10 @@@ F src/auth.c b56c78ebe40a2110fd361379f7
  F src/backup.c ff743689c4d6c5cb55ad42ed9d174b2b3e71f1e3
  F src/bitvec.c 5eb7958c3bf65210211cbcfc44eff86d0ded7c9d
  F src/btmutex.c 45a968cc85afed9b5e6cf55bf1f42f8d18107f79
- F src/btree.c 5905cbd1436d36908cf68a42145a43efb650ac34
 -F src/btree.c 9c72a5a277ade34bc0f7137bfbad878f8f9011d7
++F src/btree.c de509eeae5e8dbf365dbc37d1cf14dc6c12937c8
  F src/btree.h 969adc948e89e449220ff0ff724c94bb2a52e9f1
  F src/btreeInt.h 973a22a6fd61350b454ad614832b1f0a5e25a1e4
 -F src/build.c 9552e7490b0310a8c73fcf3a0c36e7624789d8df
 +F src/build.c 85a169a0a22f8b80caf513eaf2944d39b979f571
  F src/callback.c 7b44ce59674338ad48b0e84e7b72f935ea4f68b0
  F src/complete.c a5cf5b4b56390cfb7b8636e8f7ddef90258dd575
  F src/ctime.c 5a0b735dc95604766f5dac73973658eef782ee8b
@@@ -1279,9 -1279,10 +1279,8 @@@ F tool/vdbe_profile.tcl 67746953071a9f8
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 62a5b3633a086694ef0e579a0a82322cb1ae3d60 2ead43f074d01312c7642e1df9abccc95547f019 0055df0445932a43e42b318ef88672dcbe312c3a
- R 7ab4fcc903cf51f8eb4412f548c7eaca
- T +closed 0055df0445932a43e42b318ef88672dcbe312c3a
- T +closed 2ead43f074d01312c7642e1df9abccc95547f019
 -P 62a5b3633a086694ef0e579a0a82322cb1ae3d60
 -R 38a24026d1368e2f6d8990260ef6671e
 -T *branch * avoid-buffer-overread
 -T *sym-avoid-buffer-overread *
 -T -sym-trunk *
 -U dan
 -Z 60a303fb04c489d11c0663122f3a72f3
++P 19e2cebc12aaa4e72d3bad74af73575a0457e5d4 7e9e1b6123bc455dd7d1c894b6154ccd27acec18
++R d744c38ef8fa2ca29d4e58d42264be16
++T +closed 7e9e1b6123bc455dd7d1c894b6154ccd27acec18
 +U drh
- Z c5914e6af6583bdf37d7650c746e4d3e
++Z 5a3a1f535bbc53578663f80d8c6e8f69

diff --cc manifest.uuid
index 3f817cc04abb6edf30118df49f9eaa899019a284,b5b09e05433e5d7b003bd4f0abc516da2c5f32d5..641355972c257494294498d738530eee725aecbe
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 19e2cebc12aaa4e72d3bad74af73575a0457e5d4
 -7e9e1b6123bc455dd7d1c894b6154ccd27acec18
++95eaa49f4ee071c7a0f690a695f1f2d1ebca68a8

diff --cc src/btree.c
Simple merge