Fix the date/time translation logic in the zipfile extension so that it

works with boundary cases. See
[forum:/forumpost/d82289d69f|forum post d82289d69f] for the trouble report.

FossilOrigin-Name: c8de5f061359c174e143e5e81ade8aa9b7d71ba57287459cf0f4f2c94459c345

diff --git a/ext/misc/zipfile.c b/ext/misc/zipfile.c
index 4aefc61dcc1645720802b6a54c0f1a80e6c05ee3..86f7ba0f94f5cd9d4e2ed1b266d84bf37f011d75 100644 (file)
--- a/ext/misc/zipfile.c
+++ b/ext/misc/zipfile.c
@@ -720,34 +720,24 @@ static int zipfileScanExtra(u8 *aExtra, int nExtra, u32 *pmTime){
 ** https://msdn.microsoft.com/en-us/library/9kkf9tah.aspx
 */
 static u32 zipfileMtime(ZipfileCDS *pCDS){
-  int Y = (1980 + ((pCDS->mDate >> 9) & 0x7F));
-  int M = ((pCDS->mDate >> 5) & 0x0F);
-  int D = (pCDS->mDate & 0x1F);
-  int B = -13;
-
-  int sec = (pCDS->mTime & 0x1F)*2;
-  int min = (pCDS->mTime >> 5) & 0x3F;
-  int hr = (pCDS->mTime >> 11) & 0x1F;
-  i64 JD;
-
-  /* JD = INT(365.25 * (Y+4716)) + INT(30.6001 * (M+1)) + D + B - 1524.5 */
-
-  /* Calculate the JD in seconds for noon on the day in question */
-  if( M<3 ){
-    Y = Y-1;
-    M = M+12;
+  int Y,M,D,X1,X2,A,B,sec,min,hr;
+  i64 JDsec;
+  Y = (1980 + ((pCDS->mDate >> 9) & 0x7F));
+  M = ((pCDS->mDate >> 5) & 0x0F);
+  D = (pCDS->mDate & 0x1F);
+  sec = (pCDS->mTime & 0x1F)*2;
+  min = (pCDS->mTime >> 5) & 0x3F;
+  hr = (pCDS->mTime >> 11) & 0x1F;
+  if( M<=2 ){
+    Y--;
+    M += 12;
   }
-  JD = (i64)(24*60*60) * (
-      (int)(365.25 * (Y + 4716))
-    + (int)(30.6001 * (M + 1))
-    + D + B - 1524
-  );
-
-  /* Correct the JD for the time within the day */
-  JD += (hr-12) * 3600 + min * 60 + sec;
-
-  /* Convert JD to unix timestamp (the JD epoch is 2440587.5) */
-  return (u32)(JD - (i64)(24405875) * 24*60*6);
+  X1 = 36525*(Y+4716)/100;
+  X2 = 306001*(M+1)/10000;
+  A = Y/100;
+  B = 2 - A + (A/4);
+  JDsec = (i64)((X1 + X2 + D + B - 1524.5)*86400) + hr*3600 + min*60 + sec;
+  return (u32)(JDsec - (i64)24405875*(i64)8640);
 }
 
 /*

diff --git a/manifest b/manifest
index 56bf854028753d37cee1aaeebfd5ef6cea1036f7..82769f5dc1fbbd34d90ab1839860c1fe5865a49e 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Ensure\sthat\sthe\stypedefs\sfor\sspecific-length\sintegers\sin\szipfile.c\sare\ncorrect.
-D 2021-04-22T13:59:54.423
+C Fix\sthe\sdate/time\stranslation\slogic\sin\sthe\szipfile\sextension\sso\sthat\sit\nworks\swith\sboundary\scases.\sSee\n[forum:/forumpost/d82289d69f|forum\spost\sd82289d69f]\sfor\sthe\strouble\sreport.
+D 2021-04-22T14:43:16.313
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -337,7 +337,7 @@ F ext/misc/vfsstat.c 389ea13983d3af926504c314f06a83cc858d5adc24b40af74aaed1fece0
 F ext/misc/vtablog.c 5538acd0c8ddaae372331bee11608d76973436b77d6a91e8635cfc9432fba5ae
 F ext/misc/vtshim.c 1976e6dd68dd0d64508c91a6dfab8e75f8aaf6cd
 F ext/misc/wholenumber.c a838d1bea913c514ff316c69695efbb49ea3b8cb37d22afc57f73b6b010b4546
-F ext/misc/zipfile.c 5fe27e5dd6527bfce5d734b5a039a8a65b4893fe86b225f89bcac9f062f9c8ac
+F ext/misc/zipfile.c acbad31bd9c9ec3540fa72b2e3fcd6f757eb33117d51528c0e13d0da5c836908
 F ext/misc/zorder.c b0ff58fa643afa1d846786d51ea8d5c4b6b35aa0254ab5a82617db92f3adda64
 F ext/rbu/rbu.c b880ca5cb857d6d6f52e72eb7397813058ef48c78c5402cd04ff2b6b5437f622
 F ext/rbu/rbu1.test 221d9c18a5e600ac9ac6b1810d99d9f99163a7909ba61597876ab6e4d4beb3d6
@@ -1808,7 +1808,7 @@ F test/wordcount.c d721a4b6fae93e6e33449700bce1686bc23257c27425bc3ef1599dc912ade
 F test/writecrash.test f1da7f7adfe8d7f09ea79b42e5ca6dcc41102f27f8e334ad71539501ddd910cc
 F test/zeroblob.test 07a5b11ab591d1f26c626945fb7f228f68b993533b2ada77273edf6ee29db174
 F test/zerodamage.test 9c41628db7e8d9e8a0181e59ea5f189df311a9f6ce99cc376dc461f66db6f8dc
-F test/zipfile.test 429cb81c518487fa1b644b6b04b6e9af704a4fa767bd1a110204c5f03b2e8616
+F test/zipfile.test 0d8758d8c0d63f16644f959689f78969d223789d998964276554039f067b4548
 F test/zipfile2.test 9903388a602a3834189857a985106ff95c3bba6a3969e0134127df991889db5d
 F test/zipfilefault.test 44d4d7a7f7cca7521d569d7f71026b241d65a6b1757aa409c1a168827edbbc2c
 F tool/GetFile.cs 47852aa0d806fe47ed1ac5138bdce7f000fe87aaa7f28107d0cb1e26682aeb44
@@ -1913,7 +1913,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P c4258708c08c5b1956052f9febbf22c1e94c8352a25059063746921d2cc373b7
-R 68effacd960bb41901ef2b804dd3c9b2
+P f1f2a49007e938ea7a00dda6f8898b1cd38525c0de1e1cac00a7aebcd7b625f5
+R 47aeeb02b3e6db8af535c3912f07085e
 U drh
-Z c5ba6536955e62a1fdaffb0e62c18960
+Z 9069cf44b16e12ef7fd701f145234e86

diff --git a/manifest.uuid b/manifest.uuid
index 5201e43b183b2245f557f7582856bc66bc694f08..30d074038afd61375be712148302cd61c65e52d3 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-f1f2a49007e938ea7a00dda6f8898b1cd38525c0de1e1cac00a7aebcd7b625f5
\ No newline at end of file
+c8de5f061359c174e143e5e81ade8aa9b7d71ba57287459cf0f4f2c94459c345
\ No newline at end of file

diff --git a/test/zipfile.test b/test/zipfile.test
index 79298a050697fb9b9323b6593ceebef5628bc71f..8749f17c389ca00cbfcf7f3f7ac5c18633c972ba 100644 (file)
--- a/test/zipfile.test
+++ b/test/zipfile.test
@@ -843,4 +843,16 @@ do_catchsql_test 16.20 {
   REPLACE INTO zipfile VALUES(null,null,null,null,null,123,null);
 } {1 {zipfile: missing filename}}
 
+# 2021-04-22 forum https://sqlite.org/forum/forumpost/d82289d69f
+do_execsql_test 17.1 {
+  WITH vlist(x) AS (
+     VALUES(9223372036854775807),
+           (-9223372036854775808),
+           (9223372036854775806),
+           (-9223372036854775807)
+  )
+  SELECT DISTINCT typeof(zipfile(0,0,x,0)) FROM vlist;
+} {blob}
+  
+
 finish_test