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CLI v1.0.168
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Laurent Cozic
565
ReactNativeClient/lib/sql-extensions/sqlite/ext/misc/appendvfs.c
Normal file
565
ReactNativeClient/lib/sql-extensions/sqlite/ext/misc/appendvfs.c
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@@ -0,0 +1,565 @@
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/*
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** 2017-10-20
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This file implements a VFS shim that allows an SQLite database to be
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** appended onto the end of some other file, such as an executable.
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**
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** A special record must appear at the end of the file that identifies the
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** file as an appended database and provides an offset to page 1. For
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** best performance page 1 should be located at a disk page boundary, though
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** that is not required.
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**
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** When opening a database using this VFS, the connection might treat
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** the file as an ordinary SQLite database, or it might treat is as a
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** database appended onto some other file. Here are the rules:
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**
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** (1) When opening a new empty file, that file is treated as an ordinary
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** database.
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**
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** (2) When opening a file that begins with the standard SQLite prefix
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** string "SQLite format 3", that file is treated as an ordinary
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** database.
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**
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** (3) When opening a file that ends with the appendvfs trailer string
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** "Start-Of-SQLite3-NNNNNNNN" that file is treated as an appended
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** database.
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**
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** (4) If none of the above apply and the SQLITE_OPEN_CREATE flag is
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** set, then a new database is appended to the already existing file.
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**
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** (5) Otherwise, SQLITE_CANTOPEN is returned.
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**
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** To avoid unnecessary complications with the PENDING_BYTE, the size of
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** the file containing the database is limited to 1GB. This VFS will refuse
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** to read or write past the 1GB mark. This restriction might be lifted in
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** future versions. For now, if you need a large database, then keep the
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** database in a separate file.
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**
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** If the file being opened is not an appended database, then this shim is
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** a pass-through into the default underlying VFS.
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**/
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#include "sqlite3ext.h"
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SQLITE_EXTENSION_INIT1
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#include <string.h>
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#include <assert.h>
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/* The append mark at the end of the database is:
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**
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** Start-Of-SQLite3-NNNNNNNN
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** 123456789 123456789 12345
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**
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** The NNNNNNNN represents a 64-bit big-endian unsigned integer which is
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** the offset to page 1.
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*/
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#define APND_MARK_PREFIX "Start-Of-SQLite3-"
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#define APND_MARK_PREFIX_SZ 17
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#define APND_MARK_SIZE 25
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/*
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** Maximum size of the combined prefix + database + append-mark. This
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** must be less than 0x40000000 to avoid locking issues on Windows.
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*/
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#define APND_MAX_SIZE (65536*15259)
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/*
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** Forward declaration of objects used by this utility
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*/
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typedef struct sqlite3_vfs ApndVfs;
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typedef struct ApndFile ApndFile;
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/* Access to a lower-level VFS that (might) implement dynamic loading,
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** access to randomness, etc.
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*/
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#define ORIGVFS(p) ((sqlite3_vfs*)((p)->pAppData))
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#define ORIGFILE(p) ((sqlite3_file*)(((ApndFile*)(p))+1))
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/* An open file */
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struct ApndFile {
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sqlite3_file base; /* IO methods */
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sqlite3_int64 iPgOne; /* File offset to page 1 */
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sqlite3_int64 iMark; /* Start of the append-mark */
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};
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/*
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** Methods for ApndFile
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*/
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static int apndClose(sqlite3_file*);
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static int apndRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
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static int apndWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
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static int apndTruncate(sqlite3_file*, sqlite3_int64 size);
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static int apndSync(sqlite3_file*, int flags);
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static int apndFileSize(sqlite3_file*, sqlite3_int64 *pSize);
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static int apndLock(sqlite3_file*, int);
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static int apndUnlock(sqlite3_file*, int);
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static int apndCheckReservedLock(sqlite3_file*, int *pResOut);
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static int apndFileControl(sqlite3_file*, int op, void *pArg);
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static int apndSectorSize(sqlite3_file*);
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static int apndDeviceCharacteristics(sqlite3_file*);
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static int apndShmMap(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
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static int apndShmLock(sqlite3_file*, int offset, int n, int flags);
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static void apndShmBarrier(sqlite3_file*);
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static int apndShmUnmap(sqlite3_file*, int deleteFlag);
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static int apndFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
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static int apndUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p);
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/*
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** Methods for ApndVfs
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*/
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static int apndOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
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static int apndDelete(sqlite3_vfs*, const char *zName, int syncDir);
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static int apndAccess(sqlite3_vfs*, const char *zName, int flags, int *);
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static int apndFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
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static void *apndDlOpen(sqlite3_vfs*, const char *zFilename);
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static void apndDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
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static void (*apndDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
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static void apndDlClose(sqlite3_vfs*, void*);
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static int apndRandomness(sqlite3_vfs*, int nByte, char *zOut);
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static int apndSleep(sqlite3_vfs*, int microseconds);
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static int apndCurrentTime(sqlite3_vfs*, double*);
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static int apndGetLastError(sqlite3_vfs*, int, char *);
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static int apndCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
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static int apndSetSystemCall(sqlite3_vfs*, const char*,sqlite3_syscall_ptr);
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static sqlite3_syscall_ptr apndGetSystemCall(sqlite3_vfs*, const char *z);
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static const char *apndNextSystemCall(sqlite3_vfs*, const char *zName);
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static sqlite3_vfs apnd_vfs = {
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3, /* iVersion (set when registered) */
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0, /* szOsFile (set when registered) */
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1024, /* mxPathname */
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0, /* pNext */
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"apndvfs", /* zName */
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0, /* pAppData (set when registered) */
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apndOpen, /* xOpen */
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apndDelete, /* xDelete */
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apndAccess, /* xAccess */
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apndFullPathname, /* xFullPathname */
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apndDlOpen, /* xDlOpen */
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apndDlError, /* xDlError */
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apndDlSym, /* xDlSym */
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apndDlClose, /* xDlClose */
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apndRandomness, /* xRandomness */
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apndSleep, /* xSleep */
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apndCurrentTime, /* xCurrentTime */
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apndGetLastError, /* xGetLastError */
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apndCurrentTimeInt64, /* xCurrentTimeInt64 */
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apndSetSystemCall, /* xSetSystemCall */
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apndGetSystemCall, /* xGetSystemCall */
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apndNextSystemCall /* xNextSystemCall */
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};
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static const sqlite3_io_methods apnd_io_methods = {
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3, /* iVersion */
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apndClose, /* xClose */
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apndRead, /* xRead */
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apndWrite, /* xWrite */
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apndTruncate, /* xTruncate */
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apndSync, /* xSync */
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apndFileSize, /* xFileSize */
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apndLock, /* xLock */
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apndUnlock, /* xUnlock */
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apndCheckReservedLock, /* xCheckReservedLock */
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apndFileControl, /* xFileControl */
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apndSectorSize, /* xSectorSize */
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apndDeviceCharacteristics, /* xDeviceCharacteristics */
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apndShmMap, /* xShmMap */
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apndShmLock, /* xShmLock */
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apndShmBarrier, /* xShmBarrier */
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apndShmUnmap, /* xShmUnmap */
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apndFetch, /* xFetch */
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apndUnfetch /* xUnfetch */
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};
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/*
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** Close an apnd-file.
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*/
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static int apndClose(sqlite3_file *pFile){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xClose(pFile);
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}
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/*
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** Read data from an apnd-file.
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*/
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static int apndRead(
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sqlite3_file *pFile,
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void *zBuf,
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int iAmt,
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sqlite_int64 iOfst
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){
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ApndFile *p = (ApndFile *)pFile;
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xRead(pFile, zBuf, iAmt, iOfst+p->iPgOne);
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}
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/*
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** Add the append-mark onto the end of the file.
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*/
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static int apndWriteMark(ApndFile *p, sqlite3_file *pFile){
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int i;
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unsigned char a[APND_MARK_SIZE];
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memcpy(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ);
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for(i=0; i<8; i++){
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a[APND_MARK_PREFIX_SZ+i] = (p->iPgOne >> (56 - i*8)) & 0xff;
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}
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return pFile->pMethods->xWrite(pFile, a, APND_MARK_SIZE, p->iMark);
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}
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/*
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** Write data to an apnd-file.
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*/
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static int apndWrite(
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sqlite3_file *pFile,
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const void *zBuf,
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int iAmt,
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sqlite_int64 iOfst
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){
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int rc;
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ApndFile *p = (ApndFile *)pFile;
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pFile = ORIGFILE(pFile);
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if( iOfst+iAmt>=APND_MAX_SIZE ) return SQLITE_FULL;
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rc = pFile->pMethods->xWrite(pFile, zBuf, iAmt, iOfst+p->iPgOne);
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if( rc==SQLITE_OK && iOfst + iAmt + p->iPgOne > p->iMark ){
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sqlite3_int64 sz = 0;
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rc = pFile->pMethods->xFileSize(pFile, &sz);
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if( rc==SQLITE_OK ){
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p->iMark = sz - APND_MARK_SIZE;
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if( iOfst + iAmt + p->iPgOne > p->iMark ){
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p->iMark = p->iPgOne + iOfst + iAmt;
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rc = apndWriteMark(p, pFile);
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}
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}
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}
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return rc;
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}
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/*
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** Truncate an apnd-file.
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*/
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static int apndTruncate(sqlite3_file *pFile, sqlite_int64 size){
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int rc;
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ApndFile *p = (ApndFile *)pFile;
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pFile = ORIGFILE(pFile);
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rc = pFile->pMethods->xTruncate(pFile, size+p->iPgOne+APND_MARK_SIZE);
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if( rc==SQLITE_OK ){
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p->iMark = p->iPgOne+size;
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rc = apndWriteMark(p, pFile);
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}
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return rc;
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}
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/*
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** Sync an apnd-file.
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*/
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static int apndSync(sqlite3_file *pFile, int flags){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xSync(pFile, flags);
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}
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/*
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** Return the current file-size of an apnd-file.
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*/
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static int apndFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
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ApndFile *p = (ApndFile *)pFile;
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int rc;
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pFile = ORIGFILE(p);
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rc = pFile->pMethods->xFileSize(pFile, pSize);
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if( rc==SQLITE_OK && p->iPgOne ){
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*pSize -= p->iPgOne + APND_MARK_SIZE;
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}
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return rc;
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}
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/*
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** Lock an apnd-file.
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*/
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static int apndLock(sqlite3_file *pFile, int eLock){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xLock(pFile, eLock);
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}
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/*
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** Unlock an apnd-file.
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*/
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static int apndUnlock(sqlite3_file *pFile, int eLock){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xUnlock(pFile, eLock);
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}
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/*
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** Check if another file-handle holds a RESERVED lock on an apnd-file.
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*/
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static int apndCheckReservedLock(sqlite3_file *pFile, int *pResOut){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xCheckReservedLock(pFile, pResOut);
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}
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/*
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** File control method. For custom operations on an apnd-file.
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*/
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static int apndFileControl(sqlite3_file *pFile, int op, void *pArg){
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ApndFile *p = (ApndFile *)pFile;
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int rc;
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pFile = ORIGFILE(pFile);
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rc = pFile->pMethods->xFileControl(pFile, op, pArg);
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if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
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*(char**)pArg = sqlite3_mprintf("apnd(%lld)/%z", p->iPgOne, *(char**)pArg);
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}
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return rc;
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}
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/*
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||||
** Return the sector-size in bytes for an apnd-file.
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*/
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static int apndSectorSize(sqlite3_file *pFile){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xSectorSize(pFile);
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}
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||||
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||||
/*
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||||
** Return the device characteristic flags supported by an apnd-file.
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*/
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||||
static int apndDeviceCharacteristics(sqlite3_file *pFile){
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pFile = ORIGFILE(pFile);
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return pFile->pMethods->xDeviceCharacteristics(pFile);
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}
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||||
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||||
/* Create a shared memory file mapping */
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||||
static int apndShmMap(
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||||
sqlite3_file *pFile,
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||||
int iPg,
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||||
int pgsz,
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||||
int bExtend,
|
||||
void volatile **pp
|
||||
){
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||||
pFile = ORIGFILE(pFile);
|
||||
return pFile->pMethods->xShmMap(pFile,iPg,pgsz,bExtend,pp);
|
||||
}
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||||
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||||
/* Perform locking on a shared-memory segment */
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||||
static int apndShmLock(sqlite3_file *pFile, int offset, int n, int flags){
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||||
pFile = ORIGFILE(pFile);
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return pFile->pMethods->xShmLock(pFile,offset,n,flags);
|
||||
}
|
||||
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||||
/* Memory barrier operation on shared memory */
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||||
static void apndShmBarrier(sqlite3_file *pFile){
|
||||
pFile = ORIGFILE(pFile);
|
||||
pFile->pMethods->xShmBarrier(pFile);
|
||||
}
|
||||
|
||||
/* Unmap a shared memory segment */
|
||||
static int apndShmUnmap(sqlite3_file *pFile, int deleteFlag){
|
||||
pFile = ORIGFILE(pFile);
|
||||
return pFile->pMethods->xShmUnmap(pFile,deleteFlag);
|
||||
}
|
||||
|
||||
/* Fetch a page of a memory-mapped file */
|
||||
static int apndFetch(
|
||||
sqlite3_file *pFile,
|
||||
sqlite3_int64 iOfst,
|
||||
int iAmt,
|
||||
void **pp
|
||||
){
|
||||
ApndFile *p = (ApndFile *)pFile;
|
||||
pFile = ORIGFILE(pFile);
|
||||
return pFile->pMethods->xFetch(pFile, iOfst+p->iPgOne, iAmt, pp);
|
||||
}
|
||||
|
||||
/* Release a memory-mapped page */
|
||||
static int apndUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
|
||||
ApndFile *p = (ApndFile *)pFile;
|
||||
pFile = ORIGFILE(pFile);
|
||||
return pFile->pMethods->xUnfetch(pFile, iOfst+p->iPgOne, pPage);
|
||||
}
|
||||
|
||||
/*
|
||||
** Check to see if the file is an ordinary SQLite database file.
|
||||
*/
|
||||
static int apndIsOrdinaryDatabaseFile(sqlite3_int64 sz, sqlite3_file *pFile){
|
||||
int rc;
|
||||
char zHdr[16];
|
||||
static const char aSqliteHdr[] = "SQLite format 3";
|
||||
if( sz<512 ) return 0;
|
||||
rc = pFile->pMethods->xRead(pFile, zHdr, sizeof(zHdr), 0);
|
||||
if( rc ) return 0;
|
||||
return memcmp(zHdr, aSqliteHdr, sizeof(zHdr))==0;
|
||||
}
|
||||
|
||||
/*
|
||||
** Try to read the append-mark off the end of a file. Return the
|
||||
** start of the appended database if the append-mark is present. If
|
||||
** there is no append-mark, return -1;
|
||||
*/
|
||||
static sqlite3_int64 apndReadMark(sqlite3_int64 sz, sqlite3_file *pFile){
|
||||
int rc, i;
|
||||
sqlite3_int64 iMark;
|
||||
unsigned char a[APND_MARK_SIZE];
|
||||
|
||||
if( sz<=APND_MARK_SIZE ) return -1;
|
||||
rc = pFile->pMethods->xRead(pFile, a, APND_MARK_SIZE, sz-APND_MARK_SIZE);
|
||||
if( rc ) return -1;
|
||||
if( memcmp(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ)!=0 ) return -1;
|
||||
iMark = ((sqlite3_int64)(a[APND_MARK_PREFIX_SZ]&0x7f))<<56;
|
||||
for(i=1; i<8; i++){
|
||||
iMark += (sqlite3_int64)a[APND_MARK_PREFIX_SZ+i]<<(56-8*i);
|
||||
}
|
||||
return iMark;
|
||||
}
|
||||
|
||||
/*
|
||||
** Open an apnd file handle.
|
||||
*/
|
||||
static int apndOpen(
|
||||
sqlite3_vfs *pVfs,
|
||||
const char *zName,
|
||||
sqlite3_file *pFile,
|
||||
int flags,
|
||||
int *pOutFlags
|
||||
){
|
||||
ApndFile *p;
|
||||
sqlite3_file *pSubFile;
|
||||
sqlite3_vfs *pSubVfs;
|
||||
int rc;
|
||||
sqlite3_int64 sz;
|
||||
pSubVfs = ORIGVFS(pVfs);
|
||||
if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){
|
||||
return pSubVfs->xOpen(pSubVfs, zName, pFile, flags, pOutFlags);
|
||||
}
|
||||
p = (ApndFile*)pFile;
|
||||
memset(p, 0, sizeof(*p));
|
||||
pSubFile = ORIGFILE(pFile);
|
||||
pFile->pMethods = &apnd_io_methods;
|
||||
rc = pSubVfs->xOpen(pSubVfs, zName, pSubFile, flags, pOutFlags);
|
||||
if( rc ) goto apnd_open_done;
|
||||
rc = pSubFile->pMethods->xFileSize(pSubFile, &sz);
|
||||
if( rc ){
|
||||
pSubFile->pMethods->xClose(pSubFile);
|
||||
goto apnd_open_done;
|
||||
}
|
||||
if( apndIsOrdinaryDatabaseFile(sz, pSubFile) ){
|
||||
memmove(pFile, pSubFile, pSubVfs->szOsFile);
|
||||
return SQLITE_OK;
|
||||
}
|
||||
p->iMark = 0;
|
||||
p->iPgOne = apndReadMark(sz, pFile);
|
||||
if( p->iPgOne>0 ){
|
||||
return SQLITE_OK;
|
||||
}
|
||||
if( (flags & SQLITE_OPEN_CREATE)==0 ){
|
||||
pSubFile->pMethods->xClose(pSubFile);
|
||||
rc = SQLITE_CANTOPEN;
|
||||
}
|
||||
p->iPgOne = (sz+0xfff) & ~(sqlite3_int64)0xfff;
|
||||
apnd_open_done:
|
||||
if( rc ) pFile->pMethods = 0;
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
** All other VFS methods are pass-thrus.
|
||||
*/
|
||||
static int apndDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
|
||||
return ORIGVFS(pVfs)->xDelete(ORIGVFS(pVfs), zPath, dirSync);
|
||||
}
|
||||
static int apndAccess(
|
||||
sqlite3_vfs *pVfs,
|
||||
const char *zPath,
|
||||
int flags,
|
||||
int *pResOut
|
||||
){
|
||||
return ORIGVFS(pVfs)->xAccess(ORIGVFS(pVfs), zPath, flags, pResOut);
|
||||
}
|
||||
static int apndFullPathname(
|
||||
sqlite3_vfs *pVfs,
|
||||
const char *zPath,
|
||||
int nOut,
|
||||
char *zOut
|
||||
){
|
||||
return ORIGVFS(pVfs)->xFullPathname(ORIGVFS(pVfs),zPath,nOut,zOut);
|
||||
}
|
||||
static void *apndDlOpen(sqlite3_vfs *pVfs, const char *zPath){
|
||||
return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath);
|
||||
}
|
||||
static void apndDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
|
||||
ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg);
|
||||
}
|
||||
static void (*apndDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
|
||||
return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym);
|
||||
}
|
||||
static void apndDlClose(sqlite3_vfs *pVfs, void *pHandle){
|
||||
ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle);
|
||||
}
|
||||
static int apndRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
|
||||
return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut);
|
||||
}
|
||||
static int apndSleep(sqlite3_vfs *pVfs, int nMicro){
|
||||
return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro);
|
||||
}
|
||||
static int apndCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
|
||||
return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut);
|
||||
}
|
||||
static int apndGetLastError(sqlite3_vfs *pVfs, int a, char *b){
|
||||
return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b);
|
||||
}
|
||||
static int apndCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
|
||||
return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p);
|
||||
}
|
||||
static int apndSetSystemCall(
|
||||
sqlite3_vfs *pVfs,
|
||||
const char *zName,
|
||||
sqlite3_syscall_ptr pCall
|
||||
){
|
||||
return ORIGVFS(pVfs)->xSetSystemCall(ORIGVFS(pVfs),zName,pCall);
|
||||
}
|
||||
static sqlite3_syscall_ptr apndGetSystemCall(
|
||||
sqlite3_vfs *pVfs,
|
||||
const char *zName
|
||||
){
|
||||
return ORIGVFS(pVfs)->xGetSystemCall(ORIGVFS(pVfs),zName);
|
||||
}
|
||||
static const char *apndNextSystemCall(sqlite3_vfs *pVfs, const char *zName){
|
||||
return ORIGVFS(pVfs)->xNextSystemCall(ORIGVFS(pVfs), zName);
|
||||
}
|
||||
|
||||
|
||||
#ifdef _WIN32
|
||||
__declspec(dllexport)
|
||||
#endif
|
||||
/*
|
||||
** This routine is called when the extension is loaded.
|
||||
** Register the new VFS.
|
||||
*/
|
||||
int sqlite3_appendvfs_init(
|
||||
sqlite3 *db,
|
||||
char **pzErrMsg,
|
||||
const sqlite3_api_routines *pApi
|
||||
){
|
||||
int rc = SQLITE_OK;
|
||||
sqlite3_vfs *pOrig;
|
||||
SQLITE_EXTENSION_INIT2(pApi);
|
||||
(void)pzErrMsg;
|
||||
(void)db;
|
||||
pOrig = sqlite3_vfs_find(0);
|
||||
apnd_vfs.iVersion = pOrig->iVersion;
|
||||
apnd_vfs.pAppData = pOrig;
|
||||
apnd_vfs.szOsFile = pOrig->szOsFile + sizeof(ApndFile);
|
||||
rc = sqlite3_vfs_register(&apnd_vfs, 0);
|
||||
#ifdef APPENDVFS_TEST
|
||||
if( rc==SQLITE_OK ){
|
||||
rc = sqlite3_auto_extension((void(*)(void))apndvfsRegister);
|
||||
}
|
||||
#endif
|
||||
if( rc==SQLITE_OK ) rc = SQLITE_OK_LOAD_PERMANENTLY;
|
||||
return rc;
|
||||
}
|
||||
Reference in New Issue
Block a user