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The WebDatabase implementation in the renderer users a custom vfs to
broker file open and other requests. This modifies the built-in vfs
implementation to let that code share much of the implementation
details.
diff --git src/os_unix.c src/os_unix.c
index ef04a72..e5e1509 100644
--- src/os_unix.c
+++ src/os_unix.c
@@ -3496,9 +3496,16 @@ typedef const sqlite3_io_methods *(*finder_type)(const char*,unixFile*);
*/
/*
+** Initializes a unixFile structure with zeros.
+*/
+void initUnixFile(sqlite3_file* file) {
+ memset(file, 0, sizeof(unixFile));
+}
+
+/*
** Initialize the contents of the unixFile structure pointed to by pId.
*/
-static int fillInUnixFile(
+int fillInUnixFile(
sqlite3_vfs *pVfs, /* Pointer to vfs object */
int h, /* Open file descriptor of file being opened */
int dirfd, /* Directory file descriptor */
@@ -3812,6 +3819,73 @@ static UnixUnusedFd *findReusableFd(const char *zPath, int flags){
}
/*
+** Initializes a unixFile structure with zeros.
+*/
+void chromium_sqlite3_initialize_unix_sqlite3_file(sqlite3_file* file) {
+ memset(file, 0, sizeof(unixFile));
+}
+
+int chromium_sqlite3_fill_in_unix_sqlite3_file(sqlite3_vfs* vfs,
+ int fd,
+ int dirfd,
+ sqlite3_file* file,
+ const char* fileName,
+ int noLock,
+ int isDelete) {
+ return fillInUnixFile(vfs, fd, dirfd, file, fileName, noLock, isDelete, 0);
+}
+
+/*
+** Search for an unused file descriptor that was opened on the database file.
+** If a suitable file descriptor if found, then it is stored in *fd; otherwise,
+** *fd is not modified.
+**
+** If a reusable file descriptor is not found, and a new UnixUnusedFd cannot
+** be allocated, SQLITE_NOMEM is returned. Otherwise, SQLITE_OK is returned.
+*/
+int chromium_sqlite3_get_reusable_file_handle(sqlite3_file* file,
+ const char* fileName,
+ int flags,
+ int* fd) {
+ unixFile* unixSQLite3File = (unixFile*)file;
+ int fileType = flags & 0xFFFFFF00;
+ if (fileType == SQLITE_OPEN_MAIN_DB) {
+ UnixUnusedFd *unusedFd = findReusableFd(fileName, flags);
+ if (unusedFd) {
+ *fd = unusedFd->fd;
+ } else {
+ unusedFd = sqlite3_malloc(sizeof(*unusedFd));
+ if (!unusedFd) {
+ return SQLITE_NOMEM;
+ }
+ }
+ unixSQLite3File->pUnused = unusedFd;
+ }
+ return SQLITE_OK;
+}
+
+/*
+** Marks 'fd' as the unused file descriptor for 'pFile'.
+*/
+void chromium_sqlite3_update_reusable_file_handle(sqlite3_file* file,
+ int fd,
+ int flags) {
+ unixFile* unixSQLite3File = (unixFile*)file;
+ if (unixSQLite3File->pUnused) {
+ unixSQLite3File->pUnused->fd = fd;
+ unixSQLite3File->pUnused->flags = flags;
+ }
+}
+
+/*
+** Destroys pFile's field that keeps track of the unused file descriptor.
+*/
+void chromium_sqlite3_destroy_reusable_file_handle(sqlite3_file* file) {
+ unixFile* unixSQLite3File = (unixFile*)file;
+ sqlite3_free(unixSQLite3File->pUnused);
+}
+
+/*
** Open the file zPath.
**
** Previously, the SQLite OS layer used three functions in place of this
@@ -3893,20 +3967,13 @@ static int unixOpen(
|| eType==SQLITE_OPEN_TRANSIENT_DB
);
- memset(p, 0, sizeof(unixFile));
+ chromium_sqlite3_initialize_unix_sqlite3_file(pFile);
if( eType==SQLITE_OPEN_MAIN_DB ){
- UnixUnusedFd *pUnused;
- pUnused = findReusableFd(zName, flags);
- if( pUnused ){
- fd = pUnused->fd;
- }else{
- pUnused = sqlite3_malloc(sizeof(*pUnused));
- if( !pUnused ){
- return SQLITE_NOMEM;
- }
+ rc = chromium_sqlite3_get_reusable_file_handle(pFile, zName, flags, &fd);
+ if( rc!=SQLITE_OK ){
+ return rc;
}
- p->pUnused = pUnused;
}else if( !zName ){
/* If zName is NULL, the upper layer is requesting a temp file. */
assert(isDelete && !isOpenDirectory);
@@ -3949,10 +4016,7 @@ static int unixOpen(
*pOutFlags = flags;
}
- if( p->pUnused ){
- p->pUnused->fd = fd;
- p->pUnused->flags = flags;
- }
+ chromium_sqlite3_update_reusable_file_handle(pFile, fd, flags);
if( isDelete ){
#if OS_VXWORKS
@@ -4028,7 +4092,7 @@ static int unixOpen(
rc = fillInUnixFile(pVfs, fd, dirfd, pFile, zPath, noLock, isDelete);
open_finished:
if( rc!=SQLITE_OK ){
- sqlite3_free(p->pUnused);
+ chromium_sqlite3_destroy_reusable_file_handle(pFile);
}
return rc;
}
diff --git src/os_win.c src/os_win.c
index bc03a4b..06539d7 100644
--- src/os_win.c
+++ src/os_win.c
@@ -1890,4 +1890,11 @@ int sqlite3_os_end(void){
return SQLITE_OK;
}
+void chromium_sqlite3_initialize_win_sqlite3_file(sqlite3_file* file, HANDLE handle) {
+ winFile* winSQLite3File = (winFile*)file;
+ memset(file, 0, sizeof(*file));
+ winSQLite3File->pMethod = &winIoMethod;
+ winSQLite3File->h = handle;
+}
+
#endif /* SQLITE_OS_WIN */
|
