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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SQLiteFileSystem.h"
#include "PlatformBridge.h"
#include <sqlite3.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
using namespace WebCore;
// Defined in Chromium's codebase in third_party/sqlite/src/os_unix.c
extern "C" {
void chromium_sqlite3_initialize_unix_sqlite3_file(sqlite3_file* file);
int chromium_sqlite3_fill_in_unix_sqlite3_file(sqlite3_vfs* vfs, int fd, int dirfd, sqlite3_file* file, const char* fileName, int noLock);
int chromium_sqlite3_get_reusable_file_handle(sqlite3_file* file, const char* fileName, int flags, int* fd);
void chromium_sqlite3_update_reusable_file_handle(sqlite3_file* file, int fd, int flags);
void chromium_sqlite3_destroy_reusable_file_handle(sqlite3_file* file);
}
// Chromium's Posix implementation of SQLite VFS
namespace {
// Opens a file.
//
// vfs - pointer to the sqlite3_vfs object.
// fileName - the name of the file.
// id - the structure that will manipulate the newly opened file.
// desiredFlags - the desired open mode flags.
// usedFlags - the actual open mode flags that were used.
int chromiumOpen(sqlite3_vfs* vfs, const char* fileName,
sqlite3_file* id, int desiredFlags, int* usedFlags)
{
chromium_sqlite3_initialize_unix_sqlite3_file(id);
int fd = -1;
int result = chromium_sqlite3_get_reusable_file_handle(id, fileName, desiredFlags, &fd);
if (result != SQLITE_OK)
return result;
if (fd < 0) {
fd = PlatformBridge::databaseOpenFile(fileName, desiredFlags);
if ((fd < 0) && (desiredFlags & SQLITE_OPEN_READWRITE)) {
int newFlags = (desiredFlags & ~(SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE)) | SQLITE_OPEN_READONLY;
fd = PlatformBridge::databaseOpenFile(fileName, newFlags);
}
}
if (fd < 0) {
chromium_sqlite3_destroy_reusable_file_handle(id);
return SQLITE_CANTOPEN;
}
if (usedFlags)
*usedFlags = desiredFlags;
chromium_sqlite3_update_reusable_file_handle(id, fd, desiredFlags);
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
// The mask 0x00007F00 gives us the 7 bits that determine the type of the file SQLite is trying to open.
int fileType = desiredFlags & 0x00007F00;
int noLock = (fileType != SQLITE_OPEN_MAIN_DB);
result = chromium_sqlite3_fill_in_unix_sqlite3_file(vfs, fd, -1, id, fileName, noLock);
if (result != SQLITE_OK)
chromium_sqlite3_destroy_reusable_file_handle(id);
return result;
}
// Deletes the given file.
//
// vfs - pointer to the sqlite3_vfs object.
// fileName - the name of the file.
// syncDir - determines if the directory to which this file belongs
// should be synched after the file is deleted.
int chromiumDelete(sqlite3_vfs*, const char* fileName, int syncDir)
{
return PlatformBridge::databaseDeleteFile(fileName, syncDir);
}
// Check the existance and status of the given file.
//
// vfs - pointer to the sqlite3_vfs object.
// fileName - the name of the file.
// flag - the type of test to make on this file.
// res - the result.
int chromiumAccess(sqlite3_vfs*, const char* fileName, int flag, int* res)
{
int attr = static_cast<int>(PlatformBridge::databaseGetFileAttributes(fileName));
if (attr < 0) {
*res = 0;
return SQLITE_OK;
}
switch (flag) {
case SQLITE_ACCESS_EXISTS:
*res = 1; // if the file doesn't exist, attr < 0
break;
case SQLITE_ACCESS_READWRITE:
*res = (attr & W_OK) && (attr & R_OK);
break;
case SQLITE_ACCESS_READ:
*res = (attr & R_OK);
break;
default:
return SQLITE_ERROR;
}
return SQLITE_OK;
}
// Turns a relative pathname into a full pathname.
//
// vfs - pointer to the sqlite3_vfs object.
// relativePath - the relative path.
// bufSize - the size of the output buffer in bytes.
// absolutePath - the output buffer where the absolute path will be stored.
int chromiumFullPathname(sqlite3_vfs* vfs, const char* relativePath,
int, char* absolutePath)
{
// The renderer process doesn't need to know the absolute path of the file
sqlite3_snprintf(vfs->mxPathname, absolutePath, "%s", relativePath);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION
// Returns NULL, thus disallowing loading libraries in the renderer process.
//
// vfs - pointer to the sqlite3_vfs object.
// fileName - the name of the shared library file.
void* chromiumDlOpen(sqlite3_vfs*, const char*)
{
return 0;
}
#else
#define chromiumDlOpen 0
#endif // SQLITE_OMIT_LOAD_EXTENSION
} // namespace
namespace WebCore {
void SQLiteFileSystem::registerSQLiteVFS()
{
sqlite3_vfs* unix_vfs = sqlite3_vfs_find("unix");
static sqlite3_vfs chromium_vfs = {
1,
unix_vfs->szOsFile,
unix_vfs->mxPathname,
0,
"chromium_vfs",
unix_vfs->pAppData,
chromiumOpen,
chromiumDelete,
chromiumAccess,
chromiumFullPathname,
chromiumDlOpen,
unix_vfs->xDlError,
unix_vfs->xDlSym,
unix_vfs->xDlClose,
unix_vfs->xRandomness,
unix_vfs->xSleep,
unix_vfs->xCurrentTime,
unix_vfs->xGetLastError
};
sqlite3_vfs_register(&chromium_vfs, 0);
}
} // namespace WebCore
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