diff --git a/manifest b/manifest
index 986f6bb..9dc66ae 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Avoid\sattempting\sto\sread\s0\sbytes\sfrom\sa\sfile\sin\sthe\sosinst\svtab\scode.
-D 2019-10-07T10:29:18.641
+C Store\s64-bit\soffset\svalues\sin\sosinst\slog\sfiles.
+D 2019-10-08T19:45:17.191
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -568,7 +568,7 @@
 F src/test_multiplex.h 5436d03f2d0501d04f3ed50a75819e190495b635
 F src/test_mutex.c 7f4337ba23ee6b1d2ec81c189653608cb069926a
 F src/test_onefile.c f31e52e891c5fef6709b9fcef54ce660648a34172423a9cbdf4cbce3ba0049f4
-F src/test_osinst.c 446494a025eb5ece24de6a9a1b97b1e390c27d59ccf42d1e5cddd61c16f811c4
+F src/test_osinst.c 0a58f8a4b03274c84c97a1060dd702004f8f2f6d9af2dba9b4daa93786bf697a
 F src/test_pcache.c a5cd24730cb43c5b18629043314548c9169abb00
 F src/test_quota.c 6cb9297115b551f433a9ad1741817a9831abed99
 F src/test_quota.h 2a8ad1952d1d2ca9af0ce0465e56e6c023b5e15d
@@ -1847,7 +1847,7 @@
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ed3499a1a5c0f860b940af0edc6a6184d834001a68d59b36b0e1b21d2e6579ca
-R 167c91f002f8b3259c9adc1d3ec59b39
+P 1fb76c3e7d904cd2754270997d3d0c86237b0a630d6b1417578a8191e6e1687f
+R 3cd7734ca3a0cffa4c22dd2b9933bced
 U dan
-Z 798e91aaa2dcc84e3d48ac174ec14d84
+Z 83be8f87e7b61aedcd3403b05fb69071
diff --git a/manifest.uuid b/manifest.uuid
index 4ee4f3b..15f5f82 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-1fb76c3e7d904cd2754270997d3d0c86237b0a630d6b1417578a8191e6e1687f
\ No newline at end of file
+74d975c69abf1b8b8699e4f6539a4e411913196c90061e2c1246d25c16693ae0
\ No newline at end of file
diff --git a/src/test_osinst.c b/src/test_osinst.c
index 91e1036..6044445 100644
--- a/src/test_osinst.c
+++ b/src/test_osinst.c
@@ -249,7 +249,7 @@
 #endif
 
 static void vfslog_call(
-sqlite3_vfs *, int, int, sqlite3_uint64, sqlite3_int64, int, int, int);
+sqlite3_vfs *, int, int, sqlite3_uint64, sqlite3_int64, int, int, sqlite_int64);
 static void vfslog_string(sqlite3_vfs *, const char *);
 
 /*
@@ -284,7 +284,7 @@
   t = vfslog_time();
   rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
   t2 = vfslog_time() - t;
-  vfslog_call(p->pVfslog, OS_READ, p->iFileId, t, t2, rc, iAmt, (int)iOfst);
+  vfslog_call(p->pVfslog, OS_READ, p->iFileId, t, t2, rc, iAmt, iOfst);
   return rc;
 }
 
@@ -303,7 +303,7 @@
   t = vfslog_time();
   rc = p->pReal->pMethods->xWrite(p->pReal, z, iAmt, iOfst);
   t2 = vfslog_time() - t;
-  vfslog_call(p->pVfslog, OS_WRITE, p->iFileId, t, t2, rc, iAmt, (int)iOfst);
+  vfslog_call(p->pVfslog, OS_WRITE, p->iFileId, t, t2, rc, iAmt, iOfst);
   return rc;
 }
 
@@ -317,7 +317,7 @@
   t = vfslog_time();
   rc = p->pReal->pMethods->xTruncate(p->pReal, size);
   t2 = vfslog_time() - t;
-  vfslog_call(p->pVfslog, OS_TRUNCATE, p->iFileId, t, t2, rc, 0, (int)size);
+  vfslog_call(p->pVfslog, OS_TRUNCATE, p->iFileId, t, t2, rc, 0, size);
   return rc;
 }
 
@@ -345,7 +345,7 @@
   t = vfslog_time();
   rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
   t2 = vfslog_time() - t;
-  vfslog_call(p->pVfslog, OS_FILESIZE, p->iFileId, t, t2, rc, 0, (int)*pSize);
+  vfslog_call(p->pVfslog, OS_FILESIZE, p->iFileId, t, t2, rc, 0, *pSize);
   return rc;
 }
 
@@ -537,7 +537,7 @@
   t = vfslog_time();
   rc = REALVFS(pVfs)->xAccess(REALVFS(pVfs), zPath, flags, pResOut);
   t2 = vfslog_time() - t;
-  vfslog_call(pVfs, OS_ACCESS, 0, t, t2, rc, flags, *pResOut);
+  vfslog_call(pVfs, OS_ACCESS, 0, t, t2, rc, flags, (sqlite3_int64)*pResOut);
   vfslog_string(pVfs, zPath);
   return rc;
 }
@@ -651,6 +651,13 @@
   p[3] = (unsigned char)v;
 }
 
+static void vfslogPut64bits(unsigned char *p, sqlite3_int64 v){
+  vfslogPut32bits(p, (v >> 32) & 0xFFFFFFFF);
+  vfslogPut32bits(&p[4], v & 0xFFFFFFFF);
+}
+
+#define VFSLOG_RECORD_SIZE 36
+
 static void vfslog_call(
   sqlite3_vfs *pVfs,
   int eEvent,
@@ -659,23 +666,23 @@
   sqlite3_int64 nClick,
   int return_code,
   int size,
-  int offset
+  sqlite3_int64 offset
 ){
   VfslogVfs *p = (VfslogVfs *)pVfs;
   unsigned char *zRec;
-  if( (32+p->nBuf)>sizeof(p->aBuf) ){
+  if( (VFSLOG_RECORD_SIZE+p->nBuf)>sizeof(p->aBuf) ){
     vfslog_flush(p);
   }
   zRec = (unsigned char *)&p->aBuf[p->nBuf];
   vfslogPut32bits(&zRec[0], eEvent);
   vfslogPut32bits(&zRec[4], iFileid);
-  vfslogPut32bits(&zRec[8], (unsigned int)((tStamp>>32)&0xffffffff));
-  vfslogPut32bits(&zRec[12], (unsigned int)(tStamp&0xffffffff));
+  vfslogPut64bits(&zRec[8], (sqlite3_int64)tStamp);
   vfslogPut32bits(&zRec[16], (unsigned int)(nClick&0xffffffff));
   vfslogPut32bits(&zRec[20], return_code);
   vfslogPut32bits(&zRec[24], size);
-  vfslogPut32bits(&zRec[28], offset);
-  p->nBuf += 32;
+  vfslogPut64bits(&zRec[28], offset);
+
+  p->nBuf += VFSLOG_RECORD_SIZE;
 }
 
 static void vfslog_string(sqlite3_vfs *pVfs, const char *zStr){
@@ -979,7 +986,7 @@
   sqlite3_free(pCsr->zTransient);
   pCsr->zTransient = 0;
 
-  nRead = 32;
+  nRead = VFSLOG_RECORD_SIZE;
   if( pCsr->iOffset+nRead<=p->nByte ){
     int eEvent;
     rc = p->pFd->pMethods->xRead(p->pFd, pCsr->aBuf, nRead, pCsr->iOffset);
@@ -1067,7 +1074,17 @@
     case 2: {
       unsigned int v1 = get32bits(&pCsr->aBuf[8]);
       unsigned int v2 = get32bits(&pCsr->aBuf[12]);
-      sqlite3_result_int64(ctx,(((sqlite3_int64)v1) << 32) + (sqlite3_int64)v2);
+      sqlite3_result_int64(
+        ctx,(((sqlite3_int64)v1) << 32) + (sqlite3_int64)v2
+      );
+      break;
+    }
+    case 6: {
+      unsigned int v1 = get32bits(&pCsr->aBuf[28]);
+      unsigned int v2 = get32bits(&pCsr->aBuf[32]);
+      sqlite3_result_int64(
+        ctx,(((sqlite3_int64)v1) << 32) + (sqlite3_int64)v2
+      );
       break;
     }
     default: {