diff options
Diffstat (limited to 'chromium/third_party/sqlite/sqlite-src-3240000/src/memdb.c')
| -rw-r--r-- | chromium/third_party/sqlite/sqlite-src-3240000/src/memdb.c | 589 |
1 files changed, 0 insertions, 589 deletions
diff --git a/chromium/third_party/sqlite/sqlite-src-3240000/src/memdb.c b/chromium/third_party/sqlite/sqlite-src-3240000/src/memdb.c deleted file mode 100644 index 44189852ea9..00000000000 --- a/chromium/third_party/sqlite/sqlite-src-3240000/src/memdb.c +++ /dev/null @@ -1,589 +0,0 @@ -/* -** 2016-09-07 -** -** 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 an in-memory VFS. A database is held as a contiguous -** block of memory. -** -** This file also implements interface sqlite3_serialize() and -** sqlite3_deserialize(). -*/ -#ifdef SQLITE_ENABLE_DESERIALIZE -#include "sqliteInt.h" - -/* -** Forward declaration of objects used by this utility -*/ -typedef struct sqlite3_vfs MemVfs; -typedef struct MemFile MemFile; - -/* Access to a lower-level VFS that (might) implement dynamic loading, -** access to randomness, etc. -*/ -#define ORIGVFS(p) ((sqlite3_vfs*)((p)->pAppData)) - -/* An open file */ -struct MemFile { - sqlite3_file base; /* IO methods */ - sqlite3_int64 sz; /* Size of the file */ - sqlite3_int64 szMax; /* Space allocated to aData */ - unsigned char *aData; /* content of the file */ - int nMmap; /* Number of memory mapped pages */ - unsigned mFlags; /* Flags */ - int eLock; /* Most recent lock against this file */ -}; - -/* -** Methods for MemFile -*/ -static int memdbClose(sqlite3_file*); -static int memdbRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst); -static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst); -static int memdbTruncate(sqlite3_file*, sqlite3_int64 size); -static int memdbSync(sqlite3_file*, int flags); -static int memdbFileSize(sqlite3_file*, sqlite3_int64 *pSize); -static int memdbLock(sqlite3_file*, int); -/* static int memdbCheckReservedLock(sqlite3_file*, int *pResOut);// not used */ -static int memdbFileControl(sqlite3_file*, int op, void *pArg); -/* static int memdbSectorSize(sqlite3_file*); // not used */ -static int memdbDeviceCharacteristics(sqlite3_file*); -static int memdbFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp); -static int memdbUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p); - -/* -** Methods for MemVfs -*/ -static int memdbOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *); -/* static int memdbDelete(sqlite3_vfs*, const char *zName, int syncDir); */ -static int memdbAccess(sqlite3_vfs*, const char *zName, int flags, int *); -static int memdbFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut); -static void *memdbDlOpen(sqlite3_vfs*, const char *zFilename); -static void memdbDlError(sqlite3_vfs*, int nByte, char *zErrMsg); -static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void); -static void memdbDlClose(sqlite3_vfs*, void*); -static int memdbRandomness(sqlite3_vfs*, int nByte, char *zOut); -static int memdbSleep(sqlite3_vfs*, int microseconds); -/* static int memdbCurrentTime(sqlite3_vfs*, double*); */ -static int memdbGetLastError(sqlite3_vfs*, int, char *); -static int memdbCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*); - -static sqlite3_vfs memdb_vfs = { - 2, /* iVersion */ - 0, /* szOsFile (set when registered) */ - 1024, /* mxPathname */ - 0, /* pNext */ - "memdb", /* zName */ - 0, /* pAppData (set when registered) */ - memdbOpen, /* xOpen */ - 0, /* memdbDelete, */ /* xDelete */ - memdbAccess, /* xAccess */ - memdbFullPathname, /* xFullPathname */ - memdbDlOpen, /* xDlOpen */ - memdbDlError, /* xDlError */ - memdbDlSym, /* xDlSym */ - memdbDlClose, /* xDlClose */ - memdbRandomness, /* xRandomness */ - memdbSleep, /* xSleep */ - 0, /* memdbCurrentTime, */ /* xCurrentTime */ - memdbGetLastError, /* xGetLastError */ - memdbCurrentTimeInt64 /* xCurrentTimeInt64 */ -}; - -static const sqlite3_io_methods memdb_io_methods = { - 3, /* iVersion */ - memdbClose, /* xClose */ - memdbRead, /* xRead */ - memdbWrite, /* xWrite */ - memdbTruncate, /* xTruncate */ - memdbSync, /* xSync */ - memdbFileSize, /* xFileSize */ - memdbLock, /* xLock */ - memdbLock, /* xUnlock - same as xLock in this case */ - 0, /* memdbCheckReservedLock, */ /* xCheckReservedLock */ - memdbFileControl, /* xFileControl */ - 0, /* memdbSectorSize,*/ /* xSectorSize */ - memdbDeviceCharacteristics, /* xDeviceCharacteristics */ - 0, /* xShmMap */ - 0, /* xShmLock */ - 0, /* xShmBarrier */ - 0, /* xShmUnmap */ - memdbFetch, /* xFetch */ - memdbUnfetch /* xUnfetch */ -}; - - - -/* -** Close an memdb-file. -** -** The pData pointer is owned by the application, so there is nothing -** to free. -*/ -static int memdbClose(sqlite3_file *pFile){ - MemFile *p = (MemFile *)pFile; - if( p->mFlags & SQLITE_DESERIALIZE_FREEONCLOSE ) sqlite3_free(p->aData); - return SQLITE_OK; -} - -/* -** Read data from an memdb-file. -*/ -static int memdbRead( - sqlite3_file *pFile, - void *zBuf, - int iAmt, - sqlite_int64 iOfst -){ - MemFile *p = (MemFile *)pFile; - if( iOfst+iAmt>p->sz ){ - memset(zBuf, 0, iAmt); - if( iOfst<p->sz ) memcpy(zBuf, p->aData+iOfst, p->sz - iOfst); - return SQLITE_IOERR_SHORT_READ; - } - memcpy(zBuf, p->aData+iOfst, iAmt); - return SQLITE_OK; -} - -/* -** Try to enlarge the memory allocation to hold at least sz bytes -*/ -static int memdbEnlarge(MemFile *p, sqlite3_int64 newSz){ - unsigned char *pNew; - if( (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)==0 || p->nMmap>0 ){ - return SQLITE_FULL; - } - pNew = sqlite3_realloc64(p->aData, newSz); - if( pNew==0 ) return SQLITE_NOMEM; - p->aData = pNew; - p->szMax = newSz; - return SQLITE_OK; -} - -/* -** Write data to an memdb-file. -*/ -static int memdbWrite( - sqlite3_file *pFile, - const void *z, - int iAmt, - sqlite_int64 iOfst -){ - MemFile *p = (MemFile *)pFile; - if( iOfst+iAmt>p->sz ){ - int rc; - if( iOfst+iAmt>p->szMax - && (rc = memdbEnlarge(p, (iOfst+iAmt)*2))!=SQLITE_OK - ){ - return rc; - } - if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz); - p->sz = iOfst+iAmt; - } - memcpy(p->aData+iOfst, z, iAmt); - return SQLITE_OK; -} - -/* -** Truncate an memdb-file. -** -** In rollback mode (which is always the case for memdb, as it does not -** support WAL mode) the truncate() method is only used to reduce -** the size of a file, never to increase the size. -*/ -static int memdbTruncate(sqlite3_file *pFile, sqlite_int64 size){ - MemFile *p = (MemFile *)pFile; - if( NEVER(size>p->sz) ) return SQLITE_FULL; - p->sz = size; - return SQLITE_OK; -} - -/* -** Sync an memdb-file. -*/ -static int memdbSync(sqlite3_file *pFile, int flags){ - return SQLITE_OK; -} - -/* -** Return the current file-size of an memdb-file. -*/ -static int memdbFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){ - MemFile *p = (MemFile *)pFile; - *pSize = p->sz; - return SQLITE_OK; -} - -/* -** Lock an memdb-file. -*/ -static int memdbLock(sqlite3_file *pFile, int eLock){ - MemFile *p = (MemFile *)pFile; - p->eLock = eLock; - return SQLITE_OK; -} - -#if 0 /* Never used because memdbAccess() always returns false */ -/* -** Check if another file-handle holds a RESERVED lock on an memdb-file. -*/ -static int memdbCheckReservedLock(sqlite3_file *pFile, int *pResOut){ - *pResOut = 0; - return SQLITE_OK; -} -#endif - -/* -** File control method. For custom operations on an memdb-file. -*/ -static int memdbFileControl(sqlite3_file *pFile, int op, void *pArg){ - MemFile *p = (MemFile *)pFile; - int rc = SQLITE_NOTFOUND; - if( op==SQLITE_FCNTL_VFSNAME ){ - *(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz); - rc = SQLITE_OK; - } - return rc; -} - -#if 0 /* Not used because of SQLITE_IOCAP_POWERSAFE_OVERWRITE */ -/* -** Return the sector-size in bytes for an memdb-file. -*/ -static int memdbSectorSize(sqlite3_file *pFile){ - return 1024; -} -#endif - -/* -** Return the device characteristic flags supported by an memdb-file. -*/ -static int memdbDeviceCharacteristics(sqlite3_file *pFile){ - return SQLITE_IOCAP_ATOMIC | - SQLITE_IOCAP_POWERSAFE_OVERWRITE | - SQLITE_IOCAP_SAFE_APPEND | - SQLITE_IOCAP_SEQUENTIAL; -} - -/* Fetch a page of a memory-mapped file */ -static int memdbFetch( - sqlite3_file *pFile, - sqlite3_int64 iOfst, - int iAmt, - void **pp -){ - MemFile *p = (MemFile *)pFile; - p->nMmap++; - *pp = (void*)(p->aData + iOfst); - return SQLITE_OK; -} - -/* Release a memory-mapped page */ -static int memdbUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){ - MemFile *p = (MemFile *)pFile; - p->nMmap--; - return SQLITE_OK; -} - -/* -** Open an mem file handle. -*/ -static int memdbOpen( - sqlite3_vfs *pVfs, - const char *zName, - sqlite3_file *pFile, - int flags, - int *pOutFlags -){ - MemFile *p = (MemFile*)pFile; - if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){ - return ORIGVFS(pVfs)->xOpen(ORIGVFS(pVfs), zName, pFile, flags, pOutFlags); - } - memset(p, 0, sizeof(*p)); - p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE | SQLITE_DESERIALIZE_FREEONCLOSE; - assert( pOutFlags!=0 ); /* True because flags==SQLITE_OPEN_MAIN_DB */ - *pOutFlags = flags | SQLITE_OPEN_MEMORY; - p->base.pMethods = &memdb_io_methods; - return SQLITE_OK; -} - -#if 0 /* Only used to delete rollback journals, master journals, and WAL - ** files, none of which exist in memdb. So this routine is never used */ -/* -** Delete the file located at zPath. If the dirSync argument is true, -** ensure the file-system modifications are synced to disk before -** returning. -*/ -static int memdbDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){ - return SQLITE_IOERR_DELETE; -} -#endif - -/* -** Test for access permissions. Return true if the requested permission -** is available, or false otherwise. -** -** With memdb, no files ever exist on disk. So always return false. -*/ -static int memdbAccess( - sqlite3_vfs *pVfs, - const char *zPath, - int flags, - int *pResOut -){ - *pResOut = 0; - return SQLITE_OK; -} - -/* -** Populate buffer zOut with the full canonical pathname corresponding -** to the pathname in zPath. zOut is guaranteed to point to a buffer -** of at least (INST_MAX_PATHNAME+1) bytes. -*/ -static int memdbFullPathname( - sqlite3_vfs *pVfs, - const char *zPath, - int nOut, - char *zOut -){ - sqlite3_snprintf(nOut, zOut, "%s", zPath); - return SQLITE_OK; -} - -/* -** Open the dynamic library located at zPath and return a handle. -*/ -static void *memdbDlOpen(sqlite3_vfs *pVfs, const char *zPath){ - return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath); -} - -/* -** Populate the buffer zErrMsg (size nByte bytes) with a human readable -** utf-8 string describing the most recent error encountered associated -** with dynamic libraries. -*/ -static void memdbDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){ - ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg); -} - -/* -** Return a pointer to the symbol zSymbol in the dynamic library pHandle. -*/ -static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){ - return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym); -} - -/* -** Close the dynamic library handle pHandle. -*/ -static void memdbDlClose(sqlite3_vfs *pVfs, void *pHandle){ - ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle); -} - -/* -** Populate the buffer pointed to by zBufOut with nByte bytes of -** random data. -*/ -static int memdbRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){ - return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut); -} - -/* -** Sleep for nMicro microseconds. Return the number of microseconds -** actually slept. -*/ -static int memdbSleep(sqlite3_vfs *pVfs, int nMicro){ - return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro); -} - -#if 0 /* Never used. Modern cores only call xCurrentTimeInt64() */ -/* -** Return the current time as a Julian Day number in *pTimeOut. -*/ -static int memdbCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){ - return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut); -} -#endif - -static int memdbGetLastError(sqlite3_vfs *pVfs, int a, char *b){ - return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b); -} -static int memdbCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){ - return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p); -} - -/* -** Translate a database connection pointer and schema name into a -** MemFile pointer. -*/ -static MemFile *memdbFromDbSchema(sqlite3 *db, const char *zSchema){ - MemFile *p = 0; - int rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_FILE_POINTER, &p); - if( rc ) return 0; - if( p->base.pMethods!=&memdb_io_methods ) return 0; - return p; -} - -/* -** Return the serialization of a database -*/ -unsigned char *sqlite3_serialize( - sqlite3 *db, /* The database connection */ - const char *zSchema, /* Which database within the connection */ - sqlite3_int64 *piSize, /* Write size here, if not NULL */ - unsigned int mFlags /* Maybe SQLITE_SERIALIZE_NOCOPY */ -){ - MemFile *p; - int iDb; - Btree *pBt; - sqlite3_int64 sz; - int szPage = 0; - sqlite3_stmt *pStmt = 0; - unsigned char *pOut; - char *zSql; - int rc; - -#ifdef SQLITE_ENABLE_API_ARMOR - if( !sqlite3SafetyCheckOk(db) ){ - (void)SQLITE_MISUSE_BKPT; - return 0; - } -#endif - - if( zSchema==0 ) zSchema = db->aDb[0].zDbSName; - p = memdbFromDbSchema(db, zSchema); - iDb = sqlite3FindDbName(db, zSchema); - if( piSize ) *piSize = -1; - if( iDb<0 ) return 0; - if( p ){ - if( piSize ) *piSize = p->sz; - if( mFlags & SQLITE_SERIALIZE_NOCOPY ){ - pOut = p->aData; - }else{ - pOut = sqlite3_malloc64( p->sz ); - if( pOut ) memcpy(pOut, p->aData, p->sz); - } - return pOut; - } - pBt = db->aDb[iDb].pBt; - if( pBt==0 ) return 0; - szPage = sqlite3BtreeGetPageSize(pBt); - zSql = sqlite3_mprintf("PRAGMA \"%w\".page_count", zSchema); - rc = zSql ? sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0) : SQLITE_NOMEM; - sqlite3_free(zSql); - if( rc ) return 0; - rc = sqlite3_step(pStmt); - if( rc!=SQLITE_ROW ){ - pOut = 0; - }else{ - sz = sqlite3_column_int64(pStmt, 0)*szPage; - if( piSize ) *piSize = sz; - if( mFlags & SQLITE_SERIALIZE_NOCOPY ){ - pOut = 0; - }else{ - pOut = sqlite3_malloc64( sz ); - if( pOut ){ - int nPage = sqlite3_column_int(pStmt, 0); - Pager *pPager = sqlite3BtreePager(pBt); - int pgno; - for(pgno=1; pgno<=nPage; pgno++){ - DbPage *pPage = 0; - unsigned char *pTo = pOut + szPage*(sqlite3_int64)(pgno-1); - rc = sqlite3PagerGet(pPager, pgno, (DbPage**)&pPage, 0); - if( rc==SQLITE_OK ){ - memcpy(pTo, sqlite3PagerGetData(pPage), szPage); - }else{ - memset(pTo, 0, szPage); - } - sqlite3PagerUnref(pPage); - } - } - } - } - sqlite3_finalize(pStmt); - return pOut; -} - -/* Convert zSchema to a MemDB and initialize its content. -*/ -int sqlite3_deserialize( - sqlite3 *db, /* The database connection */ - const char *zSchema, /* Which DB to reopen with the deserialization */ - unsigned char *pData, /* The serialized database content */ - sqlite3_int64 szDb, /* Number bytes in the deserialization */ - sqlite3_int64 szBuf, /* Total size of buffer pData[] */ - unsigned mFlags /* Zero or more SQLITE_DESERIALIZE_* flags */ -){ - MemFile *p; - char *zSql; - sqlite3_stmt *pStmt = 0; - int rc; - int iDb; - -#ifdef SQLITE_ENABLE_API_ARMOR - if( !sqlite3SafetyCheckOk(db) ){ - return SQLITE_MISUSE_BKPT; - } - if( szDb<0 ) return SQLITE_MISUSE_BKPT; - if( szBuf<0 ) return SQLITE_MISUSE_BKPT; -#endif - - sqlite3_mutex_enter(db->mutex); - if( zSchema==0 ) zSchema = db->aDb[0].zDbSName; - iDb = sqlite3FindDbName(db, zSchema); - if( iDb<0 ){ - rc = SQLITE_ERROR; - goto end_deserialize; - } - zSql = sqlite3_mprintf("ATTACH x AS %Q", zSchema); - rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0); - sqlite3_free(zSql); - if( rc ) goto end_deserialize; - db->init.iDb = (u8)iDb; - db->init.reopenMemdb = 1; - rc = sqlite3_step(pStmt); - db->init.reopenMemdb = 0; - if( rc!=SQLITE_DONE ){ - rc = SQLITE_ERROR; - goto end_deserialize; - } - p = memdbFromDbSchema(db, zSchema); - if( p==0 ){ - rc = SQLITE_ERROR; - }else{ - p->aData = pData; - p->sz = szDb; - p->szMax = szBuf; - p->mFlags = mFlags; - rc = SQLITE_OK; - } - -end_deserialize: - sqlite3_finalize(pStmt); - sqlite3_mutex_leave(db->mutex); - return rc; -} - -/* -** This routine is called when the extension is loaded. -** Register the new VFS. -*/ -int sqlite3MemdbInit(void){ - sqlite3_vfs *pLower = sqlite3_vfs_find(0); - int sz = pLower->szOsFile; - memdb_vfs.pAppData = pLower; - /* In all known configurations of SQLite, the size of a default - ** sqlite3_file is greater than the size of a memdb sqlite3_file. - ** Should that ever change, remove the following NEVER() */ - if( NEVER(sz<sizeof(MemFile)) ) sz = sizeof(MemFile); - memdb_vfs.szOsFile = sz; - return sqlite3_vfs_register(&memdb_vfs, 0); -} -#endif /* SQLITE_ENABLE_DESERIALIZE */ |