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sqlcipher/src/journal.c at Xcode5 · securitykernel/sqlcipher · GitHub
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/*
** 2007 August 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file implements a special kind of sqlite3_file object used
** by SQLite to create journal files if the atomic-write optimization
** is enabled.
**
** The distinctive characteristic of this sqlite3_file is that the
** actual on disk file is created lazily. When the file is created,
** the caller specifies a buffer size for an in-memory buffer to
** be used to service read() and write() requests. The actual file
** on disk is not created or populated until either:
**
** 1) The in-memory representation grows too large for the allocated
** buffer, or
** 2) The sqlite3JournalCreate() function is called.
*/
#ifdef
SQLITE_ENABLE_ATOMIC_WRITE
#include
"sqliteInt.h"
/*
** A JournalFile object is a subclass of sqlite3_file used by
** as an open file handle for journal files.
*/
struct
JournalFile
{
sqlite3_io_methods
*
pMethod
;
/* I/O methods on journal files */
int
nBuf
;
/* Size of zBuf[] in bytes */
char
*
zBuf
;
/* Space to buffer journal writes */
int
iSize
;
/* Amount of zBuf[] currently used */
int
flags
;
/* xOpen flags */
sqlite3_vfs
*
pVfs
;
/* The "real" underlying VFS */
sqlite3_file
*
pReal
;
/* The "real" underlying file descriptor */
const
char
*
zJournal
;
/* Name of the journal file */
};
typedef
struct
JournalFile
JournalFile
;
/*
** If it does not already exists, create and populate the on-disk file
** for JournalFile p.
*/
static
int
createFile
(
JournalFile
*
p
){
int
rc
=
SQLITE_OK
;
if
( !
p
->
pReal
){
sqlite3_file
*
pReal
=
(
sqlite3_file
*
)
&
p
[
1
];
rc
=
sqlite3OsOpen
(
p
->
pVfs
,
p
->
zJournal
,
pReal
,
p
->
flags
,
0
);
if
(
rc
==
SQLITE_OK
){
p
->
pReal
=
pReal
;
if
(
p
->
iSize
>
0
){
assert
(
p
->
iSize
<=
p
->
nBuf
);
rc
=
sqlite3OsWrite
(
p
->
pReal
,
p
->
zBuf
,
p
->
iSize
,
0
);
}
if
(
rc
!=
SQLITE_OK
){
/* If an error occurred while writing to the file, close it before
** returning. This way, SQLite uses the in-memory journal data to
** roll back changes made to the internal page-cache before this
** function was called. */
sqlite3OsClose
(
pReal
);
p
->
pReal
=
0
;
}
}
}
return
rc
;
}
/*
** Close the file.
*/
static
int
jrnlClose
(
sqlite3_file
*
pJfd
){
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
(
p
->
pReal
){
sqlite3OsClose
(
p
->
pReal
);
}
sqlite3_free
(
p
->
zBuf
);
return
SQLITE_OK
;
}
/*
** Read data from the file.
*/
static
int
jrnlRead
(
sqlite3_file
*
pJfd
,
/* The journal file from which to read */
void
*
zBuf
,
/* Put the results here */
int
iAmt
,
/* Number of bytes to read */
sqlite_int64
iOfst
/* Begin reading at this offset */
){
int
rc
=
SQLITE_OK
;
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
(
p
->
pReal
){
rc
=
sqlite3OsRead
(
p
->
pReal
,
zBuf
,
iAmt
,
iOfst
);
}
else
if
( (
iAmt
+
iOfst
)
>
p
->
iSize
){
rc
=
SQLITE_IOERR_SHORT_READ
;
}
else
{
memcpy
(
zBuf
,
&
p
->
zBuf
[
iOfst
],
iAmt
);
}
return
rc
;
}
/*
** Write data to the file.
*/
static
int
jrnlWrite
(
sqlite3_file
*
pJfd
,
/* The journal file into which to write */
const
void
*
zBuf
,
/* Take data to be written from here */
int
iAmt
,
/* Number of bytes to write */
sqlite_int64
iOfst
/* Begin writing at this offset into the file */
){
int
rc
=
SQLITE_OK
;
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
( !
p
->
pReal
&&
(
iOfst
+
iAmt
)
>
p
->
nBuf
){
rc
=
createFile
(
p
);
}
if
(
rc
==
SQLITE_OK
){
if
(
p
->
pReal
){
rc
=
sqlite3OsWrite
(
p
->
pReal
,
zBuf
,
iAmt
,
iOfst
);
}
else
{
memcpy
(
&
p
->
zBuf
[
iOfst
],
zBuf
,
iAmt
);
if
(
p
->
iSize
<
(
iOfst
+
iAmt
) ){
p
->
iSize
=
(
iOfst
+
iAmt
);
}
}
}
return
rc
;
}
/*
** Truncate the file.
*/
static
int
jrnlTruncate
(
sqlite3_file
*
pJfd
,
sqlite_int64
size
){
int
rc
=
SQLITE_OK
;
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
(
p
->
pReal
){
rc
=
sqlite3OsTruncate
(
p
->
pReal
,
size
);
}
else
if
(
size
<
p
->
iSize
){
p
->
iSize
=
size
;
}
return
rc
;
}
/*
** Sync the file.
*/
static
int
jrnlSync
(
sqlite3_file
*
pJfd
,
int
flags
){
int
rc
;
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
(
p
->
pReal
){
rc
=
sqlite3OsSync
(
p
->
pReal
,
flags
);
}
else
{
rc
=
SQLITE_OK
;
}
return
rc
;
}
/*
** Query the size of the file in bytes.
*/
static
int
jrnlFileSize
(
sqlite3_file
*
pJfd
,
sqlite_int64
*
pSize
){
int
rc
=
SQLITE_OK
;
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
if
(
p
->
pReal
){
rc
=
sqlite3OsFileSize
(
p
->
pReal
,
pSize
);
}
else
{
*
pSize
=
(
sqlite_int64
)
p
->
iSize
;
}
return
rc
;
}
/*
** Table of methods for JournalFile sqlite3_file object.
*/
static
struct
sqlite3_io_methods
JournalFileMethods
=
{
1
,
/* iVersion */
jrnlClose
,
/* xClose */
jrnlRead
,
/* xRead */
jrnlWrite
,
/* xWrite */
jrnlTruncate
,
/* xTruncate */
jrnlSync
,
/* xSync */
jrnlFileSize
,
/* xFileSize */
0
,
/* xLock */
0
,
/* xUnlock */
0
,
/* xCheckReservedLock */
0
,
/* xFileControl */
0
,
/* xSectorSize */
0
,
/* xDeviceCharacteristics */
0
,
/* xShmMap */
0
,
/* xShmLock */
0
,
/* xShmBarrier */
0
/* xShmUnmap */
};
/*
** Open a journal file.
*/
int
sqlite3JournalOpen
(
sqlite3_vfs
*
pVfs
,
/* The VFS to use for actual file I/O */
const
char
*
zName
,
/* Name of the journal file */
sqlite3_file
*
pJfd
,
/* Preallocated, blank file handle */
int
flags
,
/* Opening flags */
int
nBuf
/* Bytes buffered before opening the file */
){
JournalFile
*
p
=
(
JournalFile
*
)
pJfd
;
memset
(
p
,
0
,
sqlite3JournalSize
(
pVfs
));
if
(
nBuf
>
0
){
p
->
zBuf
=
sqlite3MallocZero
(
nBuf
);
if
( !
p
->
zBuf
){
return
SQLITE_NOMEM
;
}
}
else
{
return
sqlite3OsOpen
(
pVfs
,
zName
,
pJfd
,
flags
,
0
);
}
p
->
pMethod
=
&
JournalFileMethods
;
p
->
nBuf
=
nBuf
;
p
->
flags
=
flags
;
p
->
zJournal
=
zName
;
p
->
pVfs
=
pVfs
;
return
SQLITE_OK
;
}
/*
** If the argument p points to a JournalFile structure, and the underlying
** file has not yet been created, create it now.
*/
int
sqlite3JournalCreate
(
sqlite3_file
*
p
){
if
(
p
->
pMethods
!=
&
JournalFileMethods
){
return
SQLITE_OK
;
}
return
createFile
((
JournalFile
*
)
p
);
}
/*
** The file-handle passed as the only argument is guaranteed to be an open
** file. It may or may not be of class JournalFile. If the file is a
** JournalFile, and the underlying file on disk has not yet been opened,
** return 0. Otherwise, return 1.
*/
int
sqlite3JournalExists
(
sqlite3_file
*
p
){
return
(
p
->
pMethods
!=
&
JournalFileMethods
||
((
JournalFile
*
)
p
)
->
pReal
!=
0
);
}
/*
** Return the number of bytes required to store a JournalFile that uses vfs
** pVfs to create the underlying on-disk files.
*/
int
sqlite3JournalSize
(
sqlite3_vfs
*
pVfs
){
return
(
pVfs
->
szOsFile
+
sizeof
(
JournalFile
));
}
#endif
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