Import SQLite 3.10.2.

third_party/sqlite/patches/0012-Allow-read-only-memory-mapping.patch

-From 0b346776e7a4d775932a18970801fa48d7a5ce11 Mon Sep 17 00:00:00 2001
-From: Scott Hess <shess@chromium.org>
-Date: Wed, 5 Aug 2015 16:44:32 -0700
-Subject: [PATCH 12/12] Allow read-only memory mapping.
-
-In memory-mapped I/O mode, SQLite writes pages by using memcpy() from
-the staging memory into the underlying memory-mapped file.  This allows
-anyone in the process to also write into that space.  Modify SQLite to
-map things read-only.
-
-TODO: Upstream.
-
-BUG=489784
----
- third_party/sqlite/src/src/os_unix.c | 4 ++++
- third_party/sqlite/src/src/os_win.c  | 4 ++++
- 2 files changed, 8 insertions(+)
-
-diff --git a/third_party/sqlite/src/src/os_unix.c b/third_party/sqlite/src/src/os_unix.c
-index 75b71dc..eaa97cf 100644
---- a/third_party/sqlite/src/src/os_unix.c
-+++ b/third_party/sqlite/src/src/os_unix.c
-@@ -3341,6 +3341,7 @@ static int unixWrite(
-   }
- #endif
- 
-+#if !SQLITE_MMAP_READ_ONLY
- #if SQLITE_MAX_MMAP_SIZE>0
-   /* Deal with as much of this write request as possible by transfering
-   ** data from the memory mapping using memcpy().  */
-@@ -3357,6 +3358,7 @@ static int unixWrite(
-     }
-   }
- #endif
-+#endif
- 
-   while( amt>0 && (wrote = seekAndWrite(pFile, offset, pBuf, amt))>0 ){
-     amt -= wrote;
-@@ -4743,7 +4745,9 @@ static void unixRemapfile(
-   assert( pFd->mmapSizeActual>=pFd->mmapSize );
-   assert( MAP_FAILED!=0 );
- 
-+#if !SQLITE_MMAP_READ_ONLY
-   if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
-+#endif
- 
-   if( pOrig ){
- #if HAVE_MREMAP
-diff --git a/third_party/sqlite/src/src/os_win.c b/third_party/sqlite/src/src/os_win.c
-index 9320bfc..2e757f8 100644
---- a/third_party/sqlite/src/src/os_win.c
-+++ b/third_party/sqlite/src/src/os_win.c
-@@ -2558,6 +2558,7 @@ static int winWrite(
-   OSTRACE(("WRITE file=%p, buffer=%p, amount=%d, offset=%lld, lock=%d\n",
-            pFile->h, pBuf, amt, offset, pFile->locktype));
- 
-+#if !SQLITE_MMAP_READ_ONLY
- #if SQLITE_MAX_MMAP_SIZE>0
-   /* Deal with as much of this write request as possible by transfering
-   ** data from the memory mapping using memcpy().  */
-@@ -2575,6 +2576,7 @@ static int winWrite(
-     }
-   }
- #endif
-+#endif
- 
- #if SQLITE_OS_WINCE
-   rc = winSeekFile(pFile, offset);
-@@ -4021,10 +4023,12 @@ static int winMapfile(winFile *pFd, sqlite3_int64 nByte){
-     DWORD flags = FILE_MAP_READ;
- 
-     winUnmapfile(pFd);
-+#if !SQLITE_MMAP_READ_ONLY
-     if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){
-       protect = PAGE_READWRITE;
-       flags |= FILE_MAP_WRITE;
-     }
-+#endif
- #if SQLITE_OS_WINRT
-     pFd->hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL);
- #elif defined(SQLITE_WIN32_HAS_WIDE)
--- 
-2.4.5
-