a959bf5311
necessary. There are no vulnerabilities here. However, adding these checks avoids unnecessary static analyzer complaints. [forum:/forumpost/ce1193be15|Forum post ce1193be15]. FossilOrigin-Name: 272a15b9f418fb0b31a9808f7c42c20cf52318035ff98935d8e8519634357e8d
576 lines
16 KiB
C
576 lines
16 KiB
C
/*
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** 2016-09-07
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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 is an in-memory VFS implementation. The application supplies
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** a chunk of memory to hold the database file.
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**
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** Because there is place to store a rollback or wal journal, the database
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** must use one of journal_mode=MEMORY or journal_mode=NONE.
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**
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** USAGE:
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**
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** sqlite3_open_v2("file:/whatever?ptr=0xf05538&sz=14336&max=65536", &db,
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** SQLITE_OPEN_READWRITE | SQLITE_OPEN_URI,
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** "memvfs");
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**
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** These are the query parameters:
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**
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** ptr= The address of the memory buffer that holds the database.
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**
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** sz= The current size the database file
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**
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** maxsz= The maximum size of the database. In other words, the
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** amount of space allocated for the ptr= buffer.
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**
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** freeonclose= If true, then sqlite3_free() is called on the ptr=
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** value when the connection closes.
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**
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** The ptr= and sz= query parameters are required. If maxsz= is omitted,
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** then it defaults to the sz= value. Parameter values can be in either
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** decimal or hexadecimal. The filename in the URI is ignored.
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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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/*
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** Forward declaration of objects used by this utility
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*/
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typedef struct sqlite3_vfs MemVfs;
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typedef struct MemFile MemFile;
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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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/* An open file */
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struct MemFile {
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sqlite3_file base; /* IO methods */
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sqlite3_int64 sz; /* Size of the file */
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sqlite3_int64 szMax; /* Space allocated to aData */
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unsigned char *aData; /* content of the file */
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int bFreeOnClose; /* Invoke sqlite3_free() on aData at close */
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};
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/*
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** Methods for MemFile
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*/
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static int memClose(sqlite3_file*);
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static int memRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
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static int memWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
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static int memTruncate(sqlite3_file*, sqlite3_int64 size);
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static int memSync(sqlite3_file*, int flags);
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static int memFileSize(sqlite3_file*, sqlite3_int64 *pSize);
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static int memLock(sqlite3_file*, int);
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static int memUnlock(sqlite3_file*, int);
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static int memCheckReservedLock(sqlite3_file*, int *pResOut);
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static int memFileControl(sqlite3_file*, int op, void *pArg);
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static int memSectorSize(sqlite3_file*);
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static int memDeviceCharacteristics(sqlite3_file*);
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static int memShmMap(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
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static int memShmLock(sqlite3_file*, int offset, int n, int flags);
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static void memShmBarrier(sqlite3_file*);
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static int memShmUnmap(sqlite3_file*, int deleteFlag);
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static int memFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
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static int memUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p);
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/*
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** Methods for MemVfs
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*/
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static int memOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
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static int memDelete(sqlite3_vfs*, const char *zName, int syncDir);
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static int memAccess(sqlite3_vfs*, const char *zName, int flags, int *);
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static int memFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
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static void *memDlOpen(sqlite3_vfs*, const char *zFilename);
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static void memDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
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static void (*memDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
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static void memDlClose(sqlite3_vfs*, void*);
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static int memRandomness(sqlite3_vfs*, int nByte, char *zOut);
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static int memSleep(sqlite3_vfs*, int microseconds);
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static int memCurrentTime(sqlite3_vfs*, double*);
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static int memGetLastError(sqlite3_vfs*, int, char *);
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static int memCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
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static sqlite3_vfs mem_vfs = {
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2, /* iVersion */
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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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"memvfs", /* zName */
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0, /* pAppData (set when registered) */
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memOpen, /* xOpen */
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memDelete, /* xDelete */
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memAccess, /* xAccess */
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memFullPathname, /* xFullPathname */
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memDlOpen, /* xDlOpen */
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memDlError, /* xDlError */
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memDlSym, /* xDlSym */
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memDlClose, /* xDlClose */
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memRandomness, /* xRandomness */
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memSleep, /* xSleep */
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memCurrentTime, /* xCurrentTime */
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memGetLastError, /* xGetLastError */
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memCurrentTimeInt64 /* xCurrentTimeInt64 */
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};
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static const sqlite3_io_methods mem_io_methods = {
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3, /* iVersion */
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memClose, /* xClose */
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memRead, /* xRead */
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memWrite, /* xWrite */
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memTruncate, /* xTruncate */
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memSync, /* xSync */
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memFileSize, /* xFileSize */
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memLock, /* xLock */
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memUnlock, /* xUnlock */
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memCheckReservedLock, /* xCheckReservedLock */
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memFileControl, /* xFileControl */
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memSectorSize, /* xSectorSize */
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memDeviceCharacteristics, /* xDeviceCharacteristics */
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memShmMap, /* xShmMap */
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memShmLock, /* xShmLock */
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memShmBarrier, /* xShmBarrier */
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memShmUnmap, /* xShmUnmap */
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memFetch, /* xFetch */
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memUnfetch /* xUnfetch */
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};
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/*
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** Close an mem-file.
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**
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** The pData pointer is owned by the application, so there is nothing
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** to free.
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*/
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static int memClose(sqlite3_file *pFile){
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MemFile *p = (MemFile *)pFile;
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if( p->bFreeOnClose ) sqlite3_free(p->aData);
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return SQLITE_OK;
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}
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/*
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** Read data from an mem-file.
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*/
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static int memRead(
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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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MemFile *p = (MemFile *)pFile;
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memcpy(zBuf, p->aData+iOfst, iAmt);
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return SQLITE_OK;
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}
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/*
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** Write data to an mem-file.
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*/
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static int memWrite(
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sqlite3_file *pFile,
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const void *z,
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int iAmt,
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sqlite_int64 iOfst
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){
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MemFile *p = (MemFile *)pFile;
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if( iOfst+iAmt>p->sz ){
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if( iOfst+iAmt>p->szMax ) return SQLITE_FULL;
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if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz);
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p->sz = iOfst+iAmt;
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}
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memcpy(p->aData+iOfst, z, iAmt);
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return SQLITE_OK;
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}
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/*
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** Truncate an mem-file.
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*/
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static int memTruncate(sqlite3_file *pFile, sqlite_int64 size){
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MemFile *p = (MemFile *)pFile;
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if( size>p->sz ){
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if( size>p->szMax ) return SQLITE_FULL;
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memset(p->aData+p->sz, 0, size-p->sz);
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}
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p->sz = size;
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return SQLITE_OK;
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}
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/*
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** Sync an mem-file.
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*/
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static int memSync(sqlite3_file *pFile, int flags){
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return SQLITE_OK;
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}
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/*
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** Return the current file-size of an mem-file.
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*/
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static int memFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
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MemFile *p = (MemFile *)pFile;
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*pSize = p->sz;
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return SQLITE_OK;
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}
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/*
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** Lock an mem-file.
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*/
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static int memLock(sqlite3_file *pFile, int eLock){
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return SQLITE_OK;
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}
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/*
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** Unlock an mem-file.
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*/
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static int memUnlock(sqlite3_file *pFile, int eLock){
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return SQLITE_OK;
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}
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/*
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** Check if another file-handle holds a RESERVED lock on an mem-file.
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*/
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static int memCheckReservedLock(sqlite3_file *pFile, int *pResOut){
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*pResOut = 0;
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return SQLITE_OK;
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}
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/*
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** File control method. For custom operations on an mem-file.
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*/
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static int memFileControl(sqlite3_file *pFile, int op, void *pArg){
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MemFile *p = (MemFile *)pFile;
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int rc = SQLITE_NOTFOUND;
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if( op==SQLITE_FCNTL_VFSNAME ){
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*(char**)pArg = sqlite3_mprintf("mem(%p,%lld)", p->aData, p->sz);
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rc = SQLITE_OK;
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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 mem-file.
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*/
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static int memSectorSize(sqlite3_file *pFile){
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return 1024;
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}
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/*
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** Return the device characteristic flags supported by an mem-file.
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*/
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static int memDeviceCharacteristics(sqlite3_file *pFile){
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return SQLITE_IOCAP_ATOMIC |
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SQLITE_IOCAP_POWERSAFE_OVERWRITE |
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SQLITE_IOCAP_SAFE_APPEND |
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SQLITE_IOCAP_SEQUENTIAL;
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}
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/* Create a shared memory file mapping */
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static int memShmMap(
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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,
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void volatile **pp
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){
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return SQLITE_IOERR_SHMMAP;
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}
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/* Perform locking on a shared-memory segment */
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static int memShmLock(sqlite3_file *pFile, int offset, int n, int flags){
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return SQLITE_IOERR_SHMLOCK;
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}
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/* Memory barrier operation on shared memory */
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static void memShmBarrier(sqlite3_file *pFile){
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return;
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}
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/* Unmap a shared memory segment */
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static int memShmUnmap(sqlite3_file *pFile, int deleteFlag){
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return SQLITE_OK;
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}
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/* Fetch a page of a memory-mapped file */
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static int memFetch(
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sqlite3_file *pFile,
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sqlite3_int64 iOfst,
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int iAmt,
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void **pp
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){
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MemFile *p = (MemFile *)pFile;
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*pp = (void*)(p->aData + iOfst);
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return SQLITE_OK;
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}
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/* Release a memory-mapped page */
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static int memUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
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return SQLITE_OK;
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}
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/*
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** Open an mem file handle.
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*/
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static int memOpen(
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sqlite3_vfs *pVfs,
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const char *zName,
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sqlite3_file *pFile,
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int flags,
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int *pOutFlags
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){
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MemFile *p = (MemFile*)pFile;
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memset(p, 0, sizeof(*p));
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if( (flags & SQLITE_OPEN_MAIN_DB)==0 ) return SQLITE_CANTOPEN;
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p->aData = (unsigned char*)sqlite3_uri_int64(zName,"ptr",0);
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if( p->aData==0 ) return SQLITE_CANTOPEN;
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p->sz = sqlite3_uri_int64(zName,"sz",0);
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if( p->sz<0 ) return SQLITE_CANTOPEN;
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p->szMax = sqlite3_uri_int64(zName,"max",p->sz);
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if( p->szMax<p->sz ) return SQLITE_CANTOPEN;
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p->bFreeOnClose = sqlite3_uri_boolean(zName,"freeonclose",0);
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pFile->pMethods = &mem_io_methods;
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return SQLITE_OK;
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}
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/*
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** Delete the file located at zPath. If the dirSync argument is true,
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** ensure the file-system modifications are synced to disk before
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** returning.
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*/
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static int memDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
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return SQLITE_IOERR_DELETE;
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}
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/*
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** Test for access permissions. Return true if the requested permission
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** is available, or false otherwise.
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*/
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static int memAccess(
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sqlite3_vfs *pVfs,
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const char *zPath,
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int flags,
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int *pResOut
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){
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*pResOut = 0;
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return SQLITE_OK;
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}
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/*
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** Populate buffer zOut with the full canonical pathname corresponding
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** to the pathname in zPath. zOut is guaranteed to point to a buffer
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** of at least (INST_MAX_PATHNAME+1) bytes.
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*/
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static int memFullPathname(
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sqlite3_vfs *pVfs,
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const char *zPath,
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int nOut,
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char *zOut
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){
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sqlite3_snprintf(nOut, zOut, "%s", zPath);
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return SQLITE_OK;
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}
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/*
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** Open the dynamic library located at zPath and return a handle.
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*/
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static void *memDlOpen(sqlite3_vfs *pVfs, const char *zPath){
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return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath);
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}
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/*
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** Populate the buffer zErrMsg (size nByte bytes) with a human readable
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** utf-8 string describing the most recent error encountered associated
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** with dynamic libraries.
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*/
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static void memDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
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ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg);
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}
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/*
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** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
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*/
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static void (*memDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
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return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym);
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}
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/*
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** Close the dynamic library handle pHandle.
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*/
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static void memDlClose(sqlite3_vfs *pVfs, void *pHandle){
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ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle);
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}
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/*
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** Populate the buffer pointed to by zBufOut with nByte bytes of
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** random data.
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*/
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static int memRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
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return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut);
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}
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/*
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** Sleep for nMicro microseconds. Return the number of microseconds
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** actually slept.
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*/
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static int memSleep(sqlite3_vfs *pVfs, int nMicro){
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return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro);
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}
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/*
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** Return the current time as a Julian Day number in *pTimeOut.
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*/
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static int memCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
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return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut);
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}
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static int memGetLastError(sqlite3_vfs *pVfs, int a, char *b){
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return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b);
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}
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static int memCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
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return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p);
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}
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#ifdef MEMVFS_TEST
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/*
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** memvfs_from_file(FILENAME, MAXSIZE)
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**
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** This an SQL function used to help in testing the memvfs VFS. The
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** function reads the content of a file into memory and then returns
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** a URI that can be handed to ATTACH to attach the memory buffer as
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** a database. Example:
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**
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** ATTACH memvfs_from_file('test.db',1048576) AS inmem;
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**
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** The optional MAXSIZE argument gives the size of the memory allocation
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** used to hold the database. If omitted, it defaults to the size of the
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** file on disk.
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*/
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#include <stdio.h>
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static void memvfsFromFileFunc(
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sqlite3_context *context,
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int argc,
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sqlite3_value **argv
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){
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unsigned char *p;
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sqlite3_int64 sz;
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sqlite3_int64 szMax;
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FILE *in;
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const char *zFilename = (const char*)sqlite3_value_text(argv[0]);
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char *zUri;
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if( zFilename==0 ) return;
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in = fopen(zFilename, "rb");
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if( in==0 ) return;
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fseek(in, 0, SEEK_END);
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szMax = sz = ftell(in);
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rewind(in);
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if( argc>=2 ){
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szMax = sqlite3_value_int64(argv[1]);
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if( szMax<sz ) szMax = sz;
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}
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p = sqlite3_malloc64( szMax );
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|
if( p==0 ){
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fclose(in);
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sqlite3_result_error_nomem(context);
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return;
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}
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fread(p, sz, 1, in);
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fclose(in);
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zUri = sqlite3_mprintf(
|
|
"file:/mem?vfs=memvfs&ptr=%lld&sz=%lld&max=%lld&freeonclose=1",
|
|
(sqlite3_int64)p, sz, szMax);
|
|
sqlite3_result_text(context, zUri, -1, sqlite3_free);
|
|
}
|
|
#endif /* MEMVFS_TEST */
|
|
|
|
#ifdef MEMVFS_TEST
|
|
/*
|
|
** memvfs_to_file(SCHEMA, FILENAME)
|
|
**
|
|
** The schema identified by SCHEMA must be a memvfs database. Write
|
|
** the content of this database into FILENAME.
|
|
*/
|
|
static void memvfsToFileFunc(
|
|
sqlite3_context *context,
|
|
int argc,
|
|
sqlite3_value **argv
|
|
){
|
|
MemFile *p = 0;
|
|
FILE *out;
|
|
int rc;
|
|
sqlite3 *db = sqlite3_context_db_handle(context);
|
|
sqlite3_vfs *pVfs = 0;
|
|
const char *zSchema = (const char*)sqlite3_value_text(argv[0]);
|
|
const char *zFilename = (const char*)sqlite3_value_text(argv[1]);
|
|
|
|
if( zFilename==0 ) return;
|
|
out = fopen(zFilename, "wb");
|
|
if( out==0 ) return;
|
|
rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_VFS_POINTER, &pVfs);
|
|
if( rc || pVfs==0 ) return;
|
|
if( strcmp(pVfs->zName,"memvfs")!=0 ) return;
|
|
rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_FILE_POINTER, &p);
|
|
if( rc ) return;
|
|
fwrite(p->aData, 1, (size_t)p->sz, out);
|
|
fclose(out);
|
|
}
|
|
#endif /* MEMVFS_TEST */
|
|
|
|
#ifdef MEMVFS_TEST
|
|
/* Called for each new database connection */
|
|
static int memvfsRegister(
|
|
sqlite3 *db,
|
|
char **pzErrMsg,
|
|
const struct sqlite3_api_routines *pThunk
|
|
){
|
|
sqlite3_create_function(db, "memvfs_from_file", 1, SQLITE_UTF8, 0,
|
|
memvfsFromFileFunc, 0, 0);
|
|
sqlite3_create_function(db, "memvfs_from_file", 2, SQLITE_UTF8, 0,
|
|
memvfsFromFileFunc, 0, 0);
|
|
sqlite3_create_function(db, "memvfs_to_file", 2, SQLITE_UTF8, 0,
|
|
memvfsToFileFunc, 0, 0);
|
|
return SQLITE_OK;
|
|
}
|
|
#endif /* MEMVFS_TEST */
|
|
|
|
|
|
#ifdef _WIN32
|
|
__declspec(dllexport)
|
|
#endif
|
|
/*
|
|
** This routine is called when the extension is loaded.
|
|
** Register the new VFS.
|
|
*/
|
|
int sqlite3_memvfs_init(
|
|
sqlite3 *db,
|
|
char **pzErrMsg,
|
|
const sqlite3_api_routines *pApi
|
|
){
|
|
int rc = SQLITE_OK;
|
|
SQLITE_EXTENSION_INIT2(pApi);
|
|
mem_vfs.pAppData = sqlite3_vfs_find(0);
|
|
if( mem_vfs.pAppData==0 ) return SQLITE_ERROR;
|
|
mem_vfs.szOsFile = sizeof(MemFile);
|
|
rc = sqlite3_vfs_register(&mem_vfs, 1);
|
|
#ifdef MEMVFS_TEST
|
|
if( rc==SQLITE_OK ){
|
|
rc = sqlite3_auto_extension((void(*)(void))memvfsRegister);
|
|
}
|
|
if( rc==SQLITE_OK ){
|
|
rc = memvfsRegister(db, pzErrMsg, pApi);
|
|
}
|
|
#endif
|
|
if( rc==SQLITE_OK ) rc = SQLITE_OK_LOAD_PERMANENTLY;
|
|
return rc;
|
|
}
|