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Changes In Branch quota-stdio Excluding Merge-Ins

This is equivalent to a diff from 431556cac0 to e85cfe9a17

2011-12-15
17:44
Add stdio support to the quota VFS. (check-in: 322bd15f97 user: drh tags: trunk)
17:42
Use _commit() rather than FlushFileBuffers() as a substitute for fsync() on windows. Also cast for C++ and add support for SQLITE_FCNTL_VFSNAME. (Closed-Leaf check-in: e85cfe9a17 user: drh tags: quota-stdio)
2011-12-14
00:04
Harden the utf8-to-mbcs converter in the quota module against failures. (check-in: 1cda511deb user: drh tags: quota-stdio)
2011-12-06
00:47
Merge the winGetLastError fixes into trunk. (check-in: 5b03ba9db0 user: drh tags: trunk)
2011-12-01
18:44
Add stdio-like I/O interfaces to the test_quota VFS. This is a prototype change for discussion and is mostly untested. This is an alternative to adding stdio-like I/O interfaces in the core. There is no guarantee that this code will make it into the trunk. If it does get to trunk, there could be many changes to the interface first. (check-in: bd3ce723f1 user: drh tags: quota-stdio)
02:32
Add a prototype implementation of stdio-like routines for accessing the VFS. This is intended as documentation. The code is untested. There is no guarantee that any of this will ever make it into trunk. Substantial revision is possible prior to reaching trunk, if it ever does. (Closed-Leaf check-in: 8936542b22 user: drh tags: vfs-stdio)
2011-11-29
15:40
Remove unused fields from the Parse object. Documentation and formatting improvements on data structure definitions. (check-in: 431556cac0 user: drh tags: trunk)
15:04
Remove unused boolean fields from the UnpackedRecord object. (check-in: b10d091ec0 user: drh tags: trunk)

Changes to src/test_quota.c.

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** However, before returning SQLITE_FULL, the write requests invoke
** a callback function that is configurable for each quota group.
** This callback has the opportunity to enlarge the quota.  If the
** callback does enlarge the quota such that the total size of all
** files within the group is less than the new quota, then the write
** continues as if nothing had happened.
*/
#include "sqlite3.h"
#include <string.h>
#include <assert.h>

/*
** For an build without mutexes, no-op the mutex calls.
*/
#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE==0







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** However, before returning SQLITE_FULL, the write requests invoke
** a callback function that is configurable for each quota group.
** This callback has the opportunity to enlarge the quota.  If the
** callback does enlarge the quota such that the total size of all
** files within the group is less than the new quota, then the write
** continues as if nothing had happened.
*/
#include "test_quota.h"
#include <string.h>
#include <assert.h>

/*
** For an build without mutexes, no-op the mutex calls.
*/
#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE==0
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** VFS is appended to this structure.
*/
struct quotaConn {
  sqlite3_file base;              /* Base class - must be first */
  quotaFile *pFile;               /* The underlying file */
  /* The underlying VFS sqlite3_file is appended to this object */
};













/************************* Global Variables **********************************/
/*
** All global variables used by this file are containing within the following
** gQuota structure.
*/
static struct {







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** VFS is appended to this structure.
*/
struct quotaConn {
  sqlite3_file base;              /* Base class - must be first */
  quotaFile *pFile;               /* The underlying file */
  /* The underlying VFS sqlite3_file is appended to this object */
};

/*
** An instance of the following object records the state of an
** open file.  This object is opaque to all users - the internal
** structure is only visible to the functions below.
*/
struct quota_FILE {
  FILE *f;                /* Open stdio file pointer */
  sqlite3_int64 iOfst;    /* Current offset into the file */
  quotaFile *pFile;       /* The file record in the quota system */
};


/************************* Global Variables **********************************/
/*
** All global variables used by this file are containing within the following
** gQuota structure.
*/
static struct {
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**      '?'       Matches exactly one character.
**
**     [...]      Matches one character from the enclosed list of
**                characters.
**
**     [^...]     Matches one character not in the enclosed list.
**


*/
static int quotaStrglob(const char *zGlob, const char *z){
  int c, c2;
  int invert;
  int seen;

  while( (c = (*(zGlob++)))!=0 ){
    if( c=='*' ){
      while( (c=(*(zGlob++))) == '*' || c=='?' ){
        if( c=='?' && (*(z++))==0 ) return 0;
      }
      if( c==0 ){
        return 1;
      }else if( c=='[' ){
        while( *z && quotaStrglob(zGlob-1,z)==0 ){
          z++;
        }
        return (*z)!=0;
      }

      while( (c2 = (*(z++)))!=0 ){
        while( c2!=c ){
          c2 = *(z++);
          if( c2==0 ) return 0;
        }
        if( quotaStrglob(zGlob,z) ) return 1;
      }
      return 0;
    }else if( c=='?' ){







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**      '?'       Matches exactly one character.
**
**     [...]      Matches one character from the enclosed list of
**                characters.
**
**     [^...]     Matches one character not in the enclosed list.
**
**     /          Matches "/" or "\\"
**
*/
static int quotaStrglob(const char *zGlob, const char *z){
  int c, c2, cx;
  int invert;
  int seen;

  while( (c = (*(zGlob++)))!=0 ){
    if( c=='*' ){
      while( (c=(*(zGlob++))) == '*' || c=='?' ){
        if( c=='?' && (*(z++))==0 ) return 0;
      }
      if( c==0 ){
        return 1;
      }else if( c=='[' ){
        while( *z && quotaStrglob(zGlob-1,z)==0 ){
          z++;
        }
        return (*z)!=0;
      }
      cx = (c=='/') ? '\\' : c;
      while( (c2 = (*(z++)))!=0 ){
        while( c2!=c && c2!=cx ){
          c2 = *(z++);
          if( c2==0 ) return 0;
        }
        if( quotaStrglob(zGlob,z) ) return 1;
      }
      return 0;
    }else if( c=='?' ){
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            seen = 1;
          }
          prior_c = c2;
        }
        c2 = *(zGlob++);
      }
      if( c2==0 || (seen ^ invert)==0 ) return 0;



    }else{
      if( c!=(*(z++)) ) return 0;
    }
  }
  return *z==0;
}








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            seen = 1;
          }
          prior_c = c2;
        }
        c2 = *(zGlob++);
      }
      if( c2==0 || (seen ^ invert)==0 ) return 0;
    }else if( c=='/' ){
      if( z[0]!='/' && z[0]!='\\' ) return 0;
      z++;
    }else{
      if( c!=(*(z++)) ) return 0;
    }
  }
  return *z==0;
}

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  quotaConn *p = (quotaConn*)pConn;
  return (sqlite3_file*)&p[1];
}

/* Find a file in a quota group and return a pointer to that file.
** Return NULL if the file is not in the group.
*/
static quotaFile *quotaFindFile(quotaGroup *pGroup, const char *zName){




  quotaFile *pFile = pGroup->pFiles;
  while( pFile && strcmp(pFile->zFilename, zName)!=0 ){
    pFile = pFile->pNext;
  }














  return pFile;
}




































































































/************************* VFS Method Wrappers *****************************/
/*
** This is the xOpen method used for the "quota" VFS.
**
** Most of the work is done by the underlying original VFS.  This method
** simply links the new file into the appropriate quota group if it is a







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  quotaConn *p = (quotaConn*)pConn;
  return (sqlite3_file*)&p[1];
}

/* Find a file in a quota group and return a pointer to that file.
** Return NULL if the file is not in the group.
*/
static quotaFile *quotaFindFile(
  quotaGroup *pGroup,     /* Group in which to look for the file */
  const char *zName,      /* Full pathname of the file */
  int createFlag          /* Try to create the file if not found */
){
  quotaFile *pFile = pGroup->pFiles;
  while( pFile && strcmp(pFile->zFilename, zName)!=0 ){
    pFile = pFile->pNext;
  }
  if( pFile==0 && createFlag ){
    int nName = strlen(zName);
    pFile = (quotaFile *)sqlite3_malloc( sizeof(*pFile) + nName + 1 );
    if( pFile ){
      memset(pFile, 0, sizeof(*pFile));
      pFile->zFilename = (char*)&pFile[1];
      memcpy(pFile->zFilename, zName, nName+1);
      pFile->pNext = pGroup->pFiles;
      if( pGroup->pFiles ) pGroup->pFiles->ppPrev = &pFile->pNext;
      pFile->ppPrev = &pGroup->pFiles;
      pGroup->pFiles = pFile;
      pFile->pGroup = pGroup;
    }
  }
  return pFile;
}

/*
** Figure out if we are dealing with Unix, Windows, or some other
** operating system.  After the following block of preprocess macros,
** all of SQLITE_OS_UNIX, SQLITE_OS_WIN, SQLITE_OS_OS2, and SQLITE_OS_OTHER 
** will defined to either 1 or 0.  One of the four will be 1.  The other 
** three will be 0.
*/
#if defined(SQLITE_OS_OTHER)
# if SQLITE_OS_OTHER==1
#   undef SQLITE_OS_UNIX
#   define SQLITE_OS_UNIX 0
#   undef SQLITE_OS_WIN
#   define SQLITE_OS_WIN 0
#   undef SQLITE_OS_OS2
#   define SQLITE_OS_OS2 0
# else
#   undef SQLITE_OS_OTHER
# endif
#endif
#if !defined(SQLITE_OS_UNIX) && !defined(SQLITE_OS_OTHER)
# define SQLITE_OS_OTHER 0
# ifndef SQLITE_OS_WIN
#   if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) \
                       || defined(__MINGW32__) || defined(__BORLANDC__)
#     define SQLITE_OS_WIN 1
#     define SQLITE_OS_UNIX 0
#     define SQLITE_OS_OS2 0
#   elif defined(__EMX__) || defined(_OS2) || defined(OS2) \
                          || defined(_OS2_) || defined(__OS2__)
#     define SQLITE_OS_WIN 0
#     define SQLITE_OS_UNIX 0
#     define SQLITE_OS_OS2 1
#   else
#     define SQLITE_OS_WIN 0
#     define SQLITE_OS_UNIX 1
#     define SQLITE_OS_OS2 0
#  endif
# else
#  define SQLITE_OS_UNIX 0
#  define SQLITE_OS_OS2 0
# endif
#else
# ifndef SQLITE_OS_WIN
#  define SQLITE_OS_WIN 0
# endif
#endif

#if SQLITE_OS_UNIX
# include <unistd.h>
#endif
#if SQLITE_OS_WIN
# include <windows.h>
# include <io.h>
#endif

/*
** Translate UTF8 to MBCS for use in fopen() calls.  Return a pointer to the
** translated text..  Call quota_mbcs_free() to deallocate any memory
** used to store the returned pointer when done.
*/
static char *quota_utf8_to_mbcs(const char *zUtf8){
#if SQLITE_OS_WIN
  int n;             /* Bytes in zUtf8 */
  int nWide;         /* number of UTF-16 characters */
  int nMbcs;         /* Bytes of MBCS */
  LPWSTR zTmpWide;   /* The UTF16 text */
  char *zMbcs;       /* The MBCS text */
  int codepage;      /* Code page used by fopen() */

  n = strlen(zUtf8);
  nWide = MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, NULL, 0);
  if( nWide==0 ) return 0;
  zTmpWide = (LPWSTR)sqlite3_malloc( (nWide+1)*sizeof(zTmpWide[0]) );
  if( zTmpWide==0 ) return 0;
  MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, zTmpWide, nWide);
  codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
  nMbcs = WideCharToMultiByte(codepage, 0, zTmpWide, nWide, 0, 0, 0, 0);
  zMbcs = nMbcs ? (char*)sqlite3_malloc( nMbcs+1 ) : 0;
  if( zMbcs ){
    WideCharToMultiByte(codepage, 0, zTmpWide, nWide, zMbcs, nMbcs, 0, 0);
  }
  sqlite3_free(zTmpWide);
  return zMbcs;
#else
  return (char*)zUtf8;  /* No-op on unix */
#endif  
}

/*
** Deallocate any memory allocated by quota_utf8_to_mbcs().
*/
static void quota_mbcs_free(char *zOld){
#if SQLITE_OS_WIN
  sqlite3_free(zOld);
#else
  /* No-op on unix */
#endif  
}

/************************* VFS Method Wrappers *****************************/
/*
** This is the xOpen method used for the "quota" VFS.
**
** Most of the work is done by the underlying original VFS.  This method
** simply links the new file into the appropriate quota group if it is a
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  }else{
    /* If we get to this point, it means the file needs to be quota tracked.
    */
    pQuotaOpen = (quotaConn*)pConn;
    pSubOpen = quotaSubOpen(pConn);
    rc = pOrigVfs->xOpen(pOrigVfs, zName, pSubOpen, flags, pOutFlags);
    if( rc==SQLITE_OK ){
      pFile = quotaFindFile(pGroup, zName);
      if( pFile==0 ){
        int nName = strlen(zName);
        pFile = (quotaFile *)sqlite3_malloc( sizeof(*pFile) + nName + 1 );
        if( pFile==0 ){
          quotaLeave();
          pSubOpen->pMethods->xClose(pSubOpen);
          return SQLITE_NOMEM;
        }
        memset(pFile, 0, sizeof(*pFile));
        pFile->zFilename = (char*)&pFile[1];
        memcpy(pFile->zFilename, zName, nName+1);
        pFile->pNext = pGroup->pFiles;
        if( pGroup->pFiles ) pGroup->pFiles->ppPrev = &pFile->pNext;
        pFile->ppPrev = &pGroup->pFiles;
        pGroup->pFiles = pFile;
        pFile->pGroup = pGroup;
        pFile->deleteOnClose = (flags & SQLITE_OPEN_DELETEONCLOSE)!=0;
      }
      pFile->nRef++;
      pQuotaOpen->pFile = pFile;
      if( pSubOpen->pMethods->iVersion==1 ){
        pQuotaOpen->base.pMethods = &gQuota.sIoMethodsV1;
      }else{
        pQuotaOpen->base.pMethods = &gQuota.sIoMethodsV2;
      }







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  }else{
    /* If we get to this point, it means the file needs to be quota tracked.
    */
    pQuotaOpen = (quotaConn*)pConn;
    pSubOpen = quotaSubOpen(pConn);
    rc = pOrigVfs->xOpen(pOrigVfs, zName, pSubOpen, flags, pOutFlags);
    if( rc==SQLITE_OK ){
      pFile = quotaFindFile(pGroup, zName, 1);
      if( pFile==0 ){



        quotaLeave();
        pSubOpen->pMethods->xClose(pSubOpen);
        return SQLITE_NOMEM;
      }








      pFile->deleteOnClose = (flags & SQLITE_OPEN_DELETEONCLOSE)!=0;

      pFile->nRef++;
      pQuotaOpen->pFile = pFile;
      if( pSubOpen->pMethods->iVersion==1 ){
        pQuotaOpen->base.pMethods = &gQuota.sIoMethodsV1;
      }else{
        pQuotaOpen->base.pMethods = &gQuota.sIoMethodsV2;
      }
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  /* If the file just deleted is a member of a quota group, then remove
  ** it from that quota group.
  */
  if( rc==SQLITE_OK ){
    quotaEnter();
    pGroup = quotaGroupFind(zName);
    if( pGroup ){
      pFile = quotaFindFile(pGroup, zName);
      if( pFile ){
        if( pFile->nRef ){
          pFile->deleteOnClose = 1;
        }else{
          quotaRemoveFile(pFile);
          quotaGroupDeref(pGroup);
        }







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  /* If the file just deleted is a member of a quota group, then remove
  ** it from that quota group.
  */
  if( rc==SQLITE_OK ){
    quotaEnter();
    pGroup = quotaGroupFind(zName);
    if( pGroup ){
      pFile = quotaFindFile(pGroup, zName, 0);
      if( pFile ){
        if( pFile->nRef ){
          pFile->deleteOnClose = 1;
        }else{
          quotaRemoveFile(pFile);
          quotaGroupDeref(pGroup);
        }
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  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  int rc;
  rc = pSubOpen->pMethods->xClose(pSubOpen);
  quotaEnter();
  pFile->nRef--;
  if( pFile->nRef==0 ){
    quotaGroup *pGroup = pFile->pGroup;
    if( pFile->deleteOnClose ) quotaRemoveFile(pFile);



    quotaGroupDeref(pGroup);
  }
  quotaLeave();
  return rc;
}

/* Pass xRead requests directory thru to the original VFS without







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  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  int rc;
  rc = pSubOpen->pMethods->xClose(pSubOpen);
  quotaEnter();
  pFile->nRef--;
  if( pFile->nRef==0 ){
    quotaGroup *pGroup = pFile->pGroup;
    if( pFile->deleteOnClose ){
      gQuota.pOrigVfs->xDelete(gQuota.pOrigVfs, pFile->zFilename, 0);
      quotaRemoveFile(pFile);
    }
    quotaGroupDeref(pGroup);
  }
  quotaLeave();
  return rc;
}

/* Pass xRead requests directory thru to the original VFS without
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  return pSubOpen->pMethods->xCheckReservedLock(pSubOpen, pResOut);
}

/* Pass xFileControl requests through to the original VFS unchanged.
*/
static int quotaFileControl(sqlite3_file *pConn, int op, void *pArg){
  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  return pSubOpen->pMethods->xFileControl(pSubOpen, op, pArg);






}

/* Pass xSectorSize requests through to the original VFS unchanged.
*/
static int quotaSectorSize(sqlite3_file *pConn){
  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  return pSubOpen->pMethods->xSectorSize(pSubOpen);







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  return pSubOpen->pMethods->xCheckReservedLock(pSubOpen, pResOut);
}

/* Pass xFileControl requests through to the original VFS unchanged.
*/
static int quotaFileControl(sqlite3_file *pConn, int op, void *pArg){
  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  int rc = pSubOpen->pMethods->xFileControl(pSubOpen, op, pArg);
#if defined(SQLITE_FCNTL_VFSNAME)
  if( op==SQLITE_FCNTL_VFSNAME && rc==SQLITE_OK ){
    *(char**)pArg = sqlite3_mprintf("quota/%z", *(char**)pArg);
  }
#endif
  return rc;
}

/* Pass xSectorSize requests through to the original VFS unchanged.
*/
static int quotaSectorSize(sqlite3_file *pConn){
  sqlite3_file *pSubOpen = quotaSubOpen(pConn);
  return pSubOpen->pMethods->xSectorSize(pSubOpen);
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*/
int sqlite3_quota_file(const char *zFilename){
  char *zFull;
  sqlite3_file *fd;
  int rc;
  int outFlags = 0;
  sqlite3_int64 iSize;
  fd = sqlite3_malloc(gQuota.sThisVfs.szOsFile + gQuota.sThisVfs.mxPathname+1);

  if( fd==0 ) return SQLITE_NOMEM;
  zFull = gQuota.sThisVfs.szOsFile + (char*)fd;
  rc = gQuota.pOrigVfs->xFullPathname(gQuota.pOrigVfs, zFilename,
                                      gQuota.sThisVfs.mxPathname+1, zFull);
  if( rc==SQLITE_OK ){
    rc = quotaOpen(&gQuota.sThisVfs, zFull, fd, 
                   SQLITE_OPEN_READONLY | SQLITE_OPEN_MAIN_DB, &outFlags);
  }
  if( rc==SQLITE_OK ){
    fd->pMethods->xFileSize(fd, &iSize);
    fd->pMethods->xClose(fd);
  }else if( rc==SQLITE_CANTOPEN ){
    quotaGroup *pGroup;
    quotaFile *pFile;
    quotaEnter();
    pGroup = quotaGroupFind(zFull);
    if( pGroup ){
      pFile = quotaFindFile(pGroup, zFull);
      if( pFile ) quotaRemoveFile(pFile);
    }
    quotaLeave();
  }
  sqlite3_free(fd);
  return rc;
}























































































































































































































  
/***************************** Test Code ***********************************/
#ifdef SQLITE_TEST
#include <tcl.h>

/*
** Argument passed to a TCL quota-over-limit callback.







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*/
int sqlite3_quota_file(const char *zFilename){
  char *zFull;
  sqlite3_file *fd;
  int rc;
  int outFlags = 0;
  sqlite3_int64 iSize;
  fd = (sqlite3_file*)sqlite3_malloc(gQuota.sThisVfs.szOsFile +
                                     gQuota.sThisVfs.mxPathname+1);
  if( fd==0 ) return SQLITE_NOMEM;
  zFull = gQuota.sThisVfs.szOsFile + (char*)fd;
  rc = gQuota.pOrigVfs->xFullPathname(gQuota.pOrigVfs, zFilename,
                                      gQuota.sThisVfs.mxPathname+1, zFull);
  if( rc==SQLITE_OK ){
    rc = quotaOpen(&gQuota.sThisVfs, zFull, fd, 
                   SQLITE_OPEN_READONLY | SQLITE_OPEN_MAIN_DB, &outFlags);
  }
  if( rc==SQLITE_OK ){
    fd->pMethods->xFileSize(fd, &iSize);
    fd->pMethods->xClose(fd);
  }else if( rc==SQLITE_CANTOPEN ){
    quotaGroup *pGroup;
    quotaFile *pFile;
    quotaEnter();
    pGroup = quotaGroupFind(zFull);
    if( pGroup ){
      pFile = quotaFindFile(pGroup, zFull, 0);
      if( pFile ) quotaRemoveFile(pFile);
    }
    quotaLeave();
  }
  sqlite3_free(fd);
  return rc;
}

/*
** Open a potentially quotaed file for I/O.
*/
quota_FILE *sqlite3_quota_fopen(const char *zFilename, const char *zMode){
  quota_FILE *p = 0;
  char *zFull = 0;
  char *zFullTranslated;
  int rc;
  quotaGroup *pGroup;
  quotaFile *pFile;

  zFull = (char*)sqlite3_malloc(gQuota.sThisVfs.mxPathname + 1);
  if( zFull==0 ) return 0;
  rc = gQuota.pOrigVfs->xFullPathname(gQuota.pOrigVfs, zFilename,
                                      gQuota.sThisVfs.mxPathname+1, zFull);
  if( rc ) goto quota_fopen_error;
  p = (quota_FILE*)sqlite3_malloc(sizeof(*p));
  if( p==0 ) goto quota_fopen_error;
  memset(p, 0, sizeof(*p));
  zFullTranslated = quota_utf8_to_mbcs(zFull);
  if( zFullTranslated==0 ) goto quota_fopen_error;
  p->f = fopen(zFullTranslated, zMode);
  quota_mbcs_free(zFullTranslated);
  if( p->f==0 ) goto quota_fopen_error;
  quotaEnter();
  pGroup = quotaGroupFind(zFull);
  if( pGroup ){
    pFile = quotaFindFile(pGroup, zFull, 1);
    if( pFile==0 ){
      quotaLeave();
      goto quota_fopen_error;
    }
    pFile->nRef++;
    p->pFile = pFile;
  }
  quotaLeave();
  sqlite3_free(zFull);
  return p;

quota_fopen_error:
  sqlite3_free(zFull);
  if( p && p->f ) fclose(p->f);
  sqlite3_free(p);
  return 0;
}

/*
** Read content from a quota_FILE
*/
size_t sqlite3_quota_fread(
  void *pBuf,            /* Store the content here */
  size_t size,           /* Size of each element */
  size_t nmemb,          /* Number of elements to read */
  quota_FILE *p          /* Read from this quota_FILE object */
){
  return fread(pBuf, size, nmemb, p->f);
}

/*
** Write content into a quota_FILE.  Invoke the quota callback and block
** the write if we exceed quota.
*/
size_t sqlite3_quota_fwrite(
  void *pBuf,            /* Take content to write from here */
  size_t size,           /* Size of each element */
  size_t nmemb,          /* Number of elements */
  quota_FILE *p          /* Write to this quota_FILE objecct */
){
  sqlite3_int64 iOfst;
  sqlite3_int64 iEnd;
  sqlite3_int64 szNew;
  quotaFile *pFile;
  
  iOfst = ftell(p->f);
  iEnd = iOfst + size*nmemb;
  pFile = p->pFile;
  if( pFile && pFile->iSize<iEnd ){
    quotaGroup *pGroup = pFile->pGroup;
    quotaEnter();
    szNew = pGroup->iSize - pFile->iSize + iEnd;
    if( szNew>pGroup->iLimit && pGroup->iLimit>0 ){
      if( pGroup->xCallback ){
        pGroup->xCallback(pFile->zFilename, &pGroup->iLimit, szNew, 
                          pGroup->pArg);
      }
      if( szNew>pGroup->iLimit && pGroup->iLimit>0 ){
        iEnd = pGroup->iLimit - pGroup->iSize + pFile->iSize;
        nmemb = (iEnd - iOfst)/size;
        iEnd = iOfst + size*nmemb;
        szNew = pGroup->iSize - pFile->iSize + iEnd;
      }
    }
    pGroup->iSize = szNew;
    pFile->iSize = iEnd;
    quotaLeave();
  }
  return fwrite(pBuf, size, nmemb, p->f);
}

/*
** Close an open quota_FILE stream.
*/
int sqlite3_quota_fclose(quota_FILE *p){
  int rc;
  quotaFile *pFile;
  rc = fclose(p->f);
  pFile = p->pFile;
  if( pFile ){
    quotaEnter();
    pFile->nRef--;
    if( pFile->nRef==0 ){
      quotaGroup *pGroup = pFile->pGroup;
      if( pFile->deleteOnClose ){
        gQuota.pOrigVfs->xDelete(gQuota.pOrigVfs, pFile->zFilename, 0);
        quotaRemoveFile(pFile);
      }
      quotaGroupDeref(pGroup);
    }
    quotaLeave();
  }
  sqlite3_free(p);
  return rc;
}

/*
** Flush memory buffers for a quota_FILE to disk.
*/
int sqlite3_quota_fflush(quota_FILE *p, int doFsync){
  int rc;
  rc = fflush(p->f);
  if( rc==0 && doFsync ){
#if SQLITE_OS_UNIX
    rc = fsync(fileno(p->f));
#endif
#if SQLITE_OS_WIN
    rc = _commit(_fileno(p->f));
#endif
  }
  return rc!=0;
}

/*
** Seek on a quota_FILE stream.
*/
int sqlite3_quota_fseek(quota_FILE *p, long offset, int whence){
  return fseek(p->f, offset, whence);
}

/*
** rewind a quota_FILE stream.
*/
void sqlite3_quota_rewind(quota_FILE *p){
  rewind(p->f);
}

/*
** Tell the current location of a quota_FILE stream.
*/
long sqlite3_quota_ftell(quota_FILE *p){
  return ftell(p->f);
}

/*
** Remove a managed file.  Update quotas accordingly.
*/
int sqlite3_quota_remove(const char *zFilename){
  char *zFull;            /* Full pathname for zFilename */
  int nFull;              /* Number of bytes in zFilename */
  int rc;                 /* Result code */
  quotaGroup *pGroup;     /* Group containing zFilename */
  quotaFile *pFile;       /* A file in the group */
  quotaFile *pNextFile;   /* next file in the group */
  int diff;               /* Difference between filenames */
  char c;                 /* First character past end of pattern */

  zFull = (char*)sqlite3_malloc(gQuota.sThisVfs.mxPathname + 1);
  if( zFull==0 ) return SQLITE_NOMEM;
  rc = gQuota.pOrigVfs->xFullPathname(gQuota.pOrigVfs, zFilename,
                                      gQuota.sThisVfs.mxPathname+1, zFull);
  if( rc ){
    sqlite3_free(zFull);
    return rc;
  }

  /* Figure out the length of the full pathname.  If the name ends with
  ** / (or \ on windows) then remove the trailing /.
  */
  nFull = strlen(zFull);
  if( nFull>0 && (zFull[nFull-1]=='/' || zFull[nFull-1]=='\\') ){
    nFull--;
    zFull[nFull] = 0;
  }

  quotaEnter();
  pGroup = quotaGroupFind(zFull);
  if( pGroup ){
    for(pFile=pGroup->pFiles; pFile && rc==SQLITE_OK; pFile=pNextFile){
      pNextFile = pFile->pNext;
      diff = memcmp(zFull, pFile->zFilename, nFull);
      if( diff==0 && ((c = pFile->zFilename[nFull])==0 || c=='/' || c=='\\') ){
        if( pFile->nRef ){
          pFile->deleteOnClose = 1;
        }else{
          rc = gQuota.pOrigVfs->xDelete(gQuota.pOrigVfs, pFile->zFilename, 0);
          quotaRemoveFile(pFile);
          quotaGroupDeref(pGroup);
        }
      }
    }
  }
  quotaLeave();
  sqlite3_free(zFull);
  return rc;
}
  
/***************************** Test Code ***********************************/
#ifdef SQLITE_TEST
#include <tcl.h>

/*
** Argument passed to a TCL quota-over-limit callback.
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    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewStringObj(pGroup->zPattern, -1));
    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewWideIntObj(pGroup->iLimit));
    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewWideIntObj(pGroup->iSize));
    for(pFile=pGroup->pFiles; pFile; pFile=pFile->pNext){


      pFileTerm = Tcl_NewObj();


      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewStringObj(pFile->zFilename, -1));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->iSize));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->nRef));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->deleteOnClose));
      Tcl_ListObjAppendElement(interp, pGroupTerm, pFileTerm);
    }
    Tcl_ListObjAppendElement(interp, pResult, pGroupTerm);
  }
  quotaLeave();
  Tcl_SetObjResult(interp, pResult);
  return TCL_OK;
}











































































































































































































































































/*
** This routine registers the custom TCL commands defined in this
** module.  This should be the only procedure visible from outside
** of this module.
*/
int Sqlitequota_Init(Tcl_Interp *interp){
  static struct {
     char *zName;
     Tcl_ObjCmdProc *xProc;
  } aCmd[] = {
    { "sqlite3_quota_initialize", test_quota_initialize },
    { "sqlite3_quota_shutdown", test_quota_shutdown },
    { "sqlite3_quota_set", test_quota_set },
    { "sqlite3_quota_file", test_quota_file },
    { "sqlite3_quota_dump", test_quota_dump },










  };
  int i;

  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateObjCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
  }

  return TCL_OK;
}
#endif







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    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewStringObj(pGroup->zPattern, -1));
    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewWideIntObj(pGroup->iLimit));
    Tcl_ListObjAppendElement(interp, pGroupTerm,
          Tcl_NewWideIntObj(pGroup->iSize));
    for(pFile=pGroup->pFiles; pFile; pFile=pFile->pNext){
      int i;
      char zTemp[1000];
      pFileTerm = Tcl_NewObj();
      sqlite3_snprintf(sizeof(zTemp), zTemp, "%s", pFile->zFilename);
      for(i=0; zTemp[i]; i++){ if( zTemp[i]=='\\' ) zTemp[i] = '/'; }
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewStringObj(zTemp, -1));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->iSize));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->nRef));
      Tcl_ListObjAppendElement(interp, pFileTerm,
            Tcl_NewWideIntObj(pFile->deleteOnClose));
      Tcl_ListObjAppendElement(interp, pGroupTerm, pFileTerm);
    }
    Tcl_ListObjAppendElement(interp, pResult, pGroupTerm);
  }
  quotaLeave();
  Tcl_SetObjResult(interp, pResult);
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_fopen FILENAME MODE
*/
static int test_quota_fopen(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  const char *zFilename;          /* File pattern to configure */
  const char *zMode;              /* Mode string */
  quota_FILE *p;                  /* Open string object */
  char zReturn[50];               /* Name of pointer to return */

  /* Process arguments */
  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "FILENAME MODE");
    return TCL_ERROR;
  }
  zFilename = Tcl_GetString(objv[1]);
  zMode = Tcl_GetString(objv[2]);
  p = sqlite3_quota_fopen(zFilename, zMode);
  sqlite3_snprintf(sizeof(zReturn), zReturn, "%p", p);
  Tcl_SetResult(interp, zReturn, TCL_VOLATILE);
  return TCL_OK;
}

/* Defined in test1.c */
extern void *sqlite3TestTextToPtr(const char*);

/*
** tclcmd: sqlite3_quota_fread HANDLE SIZE NELEM
*/
static int test_quota_fread(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  char *zBuf;
  int sz;
  int nElem;
  int got;

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE SIZE NELEM");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  if( Tcl_GetIntFromObj(interp, objv[2], &sz) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[3], &nElem) ) return TCL_ERROR;
  zBuf = (char*)sqlite3_malloc( sz*nElem + 1 );
  if( zBuf==0 ){
    Tcl_SetResult(interp, "out of memory", TCL_STATIC);
    return TCL_ERROR;
  }
  got = sqlite3_quota_fread(zBuf, sz, nElem, p);
  if( got<0 ) got = 0;
  zBuf[got*sz] = 0;
  Tcl_SetResult(interp, zBuf, TCL_VOLATILE);
  sqlite3_free(zBuf);
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_fwrite HANDLE SIZE NELEM CONTENT
*/
static int test_quota_fwrite(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  char *zBuf;
  int sz;
  int nElem;
  int got;

  if( objc!=5 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE SIZE NELEM CONTENT");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  if( Tcl_GetIntFromObj(interp, objv[2], &sz) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[3], &nElem) ) return TCL_ERROR;
  zBuf = Tcl_GetString(objv[4]);
  got = sqlite3_quota_fwrite(zBuf, sz, nElem, p);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(got));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_fclose HANDLE
*/
static int test_quota_fclose(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  int rc;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  rc = sqlite3_quota_fclose(p);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_fflush HANDLE ?HARDSYNC?
*/
static int test_quota_fflush(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  int rc;
  int doSync = 0;

  if( objc!=2 && objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE ?HARDSYNC?");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  if( objc==3 ){
    if( Tcl_GetBooleanFromObj(interp, objv[2], &doSync) ) return TCL_ERROR;
  }
  rc = sqlite3_quota_fflush(p, doSync);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_fseek HANDLE OFFSET WHENCE
*/
static int test_quota_fseek(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  int ofst;
  const char *zWhence;
  int whence;
  int rc;

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE OFFSET WHENCE");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  if( Tcl_GetIntFromObj(interp, objv[2], &ofst) ) return TCL_ERROR;
  zWhence = Tcl_GetString(objv[3]);
  if( strcmp(zWhence, "SEEK_SET")==0 ){
    whence = SEEK_SET;
  }else if( strcmp(zWhence, "SEEK_CUR")==0 ){
    whence = SEEK_CUR;
  }else if( strcmp(zWhence, "SEEK_END")==0 ){
    whence = SEEK_END;
  }else{
    Tcl_AppendResult(interp,
           "WHENCE should be SEEK_SET, SEEK_CUR, or SEEK_END", (char*)0);
    return TCL_ERROR;
  }
  rc = sqlite3_quota_fseek(p, ofst, whence);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_rewind HANDLE
*/
static int test_quota_rewind(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  sqlite3_quota_rewind(p);
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_ftell HANDLE
*/
static int test_quota_ftell(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  quota_FILE *p;
  sqlite3_int64 x;
  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "HANDLE");
    return TCL_ERROR;
  }
  p = sqlite3TestTextToPtr(Tcl_GetString(objv[1]));
  x = sqlite3_quota_ftell(p);
  Tcl_SetObjResult(interp, Tcl_NewWideIntObj(x));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_remove FILENAME
*/
static int test_quota_remove(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  const char *zFilename;          /* File pattern to configure */
  int rc;
  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "FILENAME");
    return TCL_ERROR;
  }
  zFilename = Tcl_GetString(objv[1]);
  rc = sqlite3_quota_remove(zFilename);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
  return TCL_OK;
}

/*
** tclcmd: sqlite3_quota_glob PATTERN TEXT
**
** Test the glob pattern matching.  Return 1 if TEXT matches PATTERN
** and return 0 if it does not.
*/
static int test_quota_glob(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  const char *zPattern;          /* The glob pattern */
  const char *zText;             /* Text to compare agains the pattern */
  int rc;
  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "PATTERN TEXT");
    return TCL_ERROR;
  }
  zPattern = Tcl_GetString(objv[1]);
  zText = Tcl_GetString(objv[2]);
  rc = quotaStrglob(zPattern, zText);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
  return TCL_OK;
}

/*
** This routine registers the custom TCL commands defined in this
** module.  This should be the only procedure visible from outside
** of this module.
*/
int Sqlitequota_Init(Tcl_Interp *interp){
  static struct {
     char *zName;
     Tcl_ObjCmdProc *xProc;
  } aCmd[] = {
    { "sqlite3_quota_initialize", test_quota_initialize },
    { "sqlite3_quota_shutdown",   test_quota_shutdown },
    { "sqlite3_quota_set",        test_quota_set },
    { "sqlite3_quota_file",       test_quota_file },
    { "sqlite3_quota_dump",       test_quota_dump },
    { "sqlite3_quota_fopen",      test_quota_fopen },
    { "sqlite3_quota_fread",      test_quota_fread },
    { "sqlite3_quota_fwrite",     test_quota_fwrite },
    { "sqlite3_quota_fclose",     test_quota_fclose },
    { "sqlite3_quota_fflush",     test_quota_fflush },
    { "sqlite3_quota_fseek",      test_quota_fseek },
    { "sqlite3_quota_rewind",     test_quota_rewind },
    { "sqlite3_quota_ftell",      test_quota_ftell },
    { "sqlite3_quota_remove",     test_quota_remove },
    { "sqlite3_quota_glob",       test_quota_glob },
  };
  int i;

  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateObjCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
  }

  return TCL_OK;
}
#endif

Added src/test_quota.h.



































































































































































































































































































































































































































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/*
** 2011 December 1
**
** 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 contains the interface definition for the quota a VFS shim.
**
** This particular shim enforces a quota system on files.  One or more
** database files are in a "quota group" that is defined by a GLOB
** pattern.  A quota is set for the combined size of all files in the
** the group.  A quota of zero means "no limit".  If the total size
** of all files in the quota group is greater than the limit, then
** write requests that attempt to enlarge a file fail with SQLITE_FULL.
**
** However, before returning SQLITE_FULL, the write requests invoke
** a callback function that is configurable for each quota group.
** This callback has the opportunity to enlarge the quota.  If the
** callback does enlarge the quota such that the total size of all
** files within the group is less than the new quota, then the write
** continues as if nothing had happened.
*/
#ifndef _QUOTA_H_
#include "sqlite3.h"
#include <stdio.h>

/* Make this callable from C++ */
#ifdef __cplusplus
extern "C" {
#endif

/*
** Initialize the quota VFS shim.  Use the VFS named zOrigVfsName
** as the VFS that does the actual work.  Use the default if
** zOrigVfsName==NULL.  
**
** The quota VFS shim is named "quota".  It will become the default
** VFS if makeDefault is non-zero.
**
** THIS ROUTINE IS NOT THREADSAFE.  Call this routine exactly once
** during start-up.
*/
int sqlite3_quota_initialize(const char *zOrigVfsName, int makeDefault);

/*
** Shutdown the quota system.
**
** All SQLite database connections must be closed before calling this
** routine.
**
** THIS ROUTINE IS NOT THREADSAFE.  Call this routine exactly once while
** shutting down in order to free all remaining quota groups.
*/
int sqlite3_quota_shutdown(void);

/*
** Create or destroy a quota group.
**
** The quota group is defined by the zPattern.  When calling this routine
** with a zPattern for a quota group that already exists, this routine
** merely updates the iLimit, xCallback, and pArg values for that quota
** group.  If zPattern is new, then a new quota group is created.
**
** The zPattern is always compared against the full pathname of the file.
** Even if APIs are called with relative pathnames, SQLite converts the
** name to a full pathname before comparing it against zPattern.  zPattern
** is a glob pattern with the following matching rules:
**
**      '*'       Matches any sequence of zero or more characters.
**
**      '?'       Matches exactly one character.
**
**     [...]      Matches one character from the enclosed list of
**                characters.  "]" can be part of the list if it is
**                the first character.  Within the list "X-Y" matches
**                characters X or Y or any character in between the
**                two.  Ex:  "[0-9]" matches any digit.
**
**     [^...]     Matches one character not in the enclosed list.
**
**     /          Matches either / or \.  This allows glob patterns
**                containing / to work on both unix and windows.
**
** Note that, unlike unix shell globbing, the directory separator "/"
** can match a wildcard.  So, for example, the pattern "/abc/xyz/" "*"
** matches any files anywhere in the directory hierarchy beneath
** /abc/xyz.
**
** The glob algorithm works on bytes.  Multi-byte UTF8 characters are
** matched as if each byte were a separate character.
**
** If the iLimit for a quota group is set to zero, then the quota group
** is disabled and will be deleted when the last database connection using
** the quota group is closed.
**
** Calling this routine on a zPattern that does not exist and with a
** zero iLimit is a no-op.
**
** A quota group must exist with a non-zero iLimit prior to opening
** database connections if those connections are to participate in the
** quota group.  Creating a quota group does not affect database connections
** that are already open.
**
** The patterns that define the various quota groups should be distinct.
** If the same filename matches more than one quota group pattern, then
** the behavior of this package is undefined.
*/
int sqlite3_quota_set(
  const char *zPattern,           /* The filename pattern */
  sqlite3_int64 iLimit,           /* New quota to set for this quota group */
  void (*xCallback)(              /* Callback invoked when going over quota */
     const char *zFilename,         /* Name of file whose size increases */
     sqlite3_int64 *piLimit,        /* IN/OUT: The current limit */
     sqlite3_int64 iSize,           /* Total size of all files in the group */
     void *pArg                     /* Client data */
  ),
  void *pArg,                     /* client data passed thru to callback */
  void (*xDestroy)(void*)         /* Optional destructor for pArg */
);

/*
** Bring the named file under quota management, assuming its name matches
** the glob pattern of some quota group.  Or if it is already under
** management, update its size.  If zFilename does not match the glob
** pattern of any quota group, this routine is a no-op.
*/
int sqlite3_quota_file(const char *zFilename);

/*
** The following object serves the same role as FILE in the standard C
** library.  It represents an open connection to a file on disk for I/O.
**
** A single quota_FILE should not be used by two or more threads at the
** same time.  Multiple threads can be using different quota_FILE objects
** simultaneously, but not the same quota_FILE object.
*/
typedef struct quota_FILE quota_FILE;

/*
** Create a new quota_FILE object used to read and/or write to the
** file zFilename.  The zMode parameter is as with standard library zMode.
*/
quota_FILE *sqlite3_quota_fopen(const char *zFilename, const char *zMode);

/*
** Perform I/O against a quota_FILE object.  When doing writes, the
** quota mechanism may result in a short write, in order to prevent
** the sum of sizes of all files from going over quota.
*/
size_t sqlite3_quota_fread(void*, size_t, size_t, quota_FILE*);
size_t sqlite3_quota_fwrite(void*, size_t, size_t, quota_FILE*);

/*
** Flush all written content held in memory buffers out to disk.
** This is the equivalent of fflush() in the standard library.
**
** If the hardSync parameter is true (non-zero) then this routine
** also forces OS buffers to disk - the equivalent of fsync().
**
** This routine return zero on success and non-zero if something goes
** wrong.
*/
int sqlite3_quota_fflush(quota_FILE*, int hardSync);

/*
** Close a quota_FILE object and free all associated resources.  The
** file remains under quota management.
*/
int sqlite3_quota_fclose(quota_FILE*);

/*
** Move the read/write pointer for a quota_FILE object.  Or tell the
** current location of the read/write pointer.
*/
int sqlite3_quota_fseek(quota_FILE*, long, int);
void sqlite3_quota_rewind(quota_FILE*);
long sqlite3_quota_ftell(quota_FILE*);

/*
** Delete a file from the disk, if that file is under quota management.
** Adjust quotas accordingly.
**
** If zFilename is the name of a directory that matches one of the
** quota glob patterns, then all files under quota management that
** are contained within that directory are deleted.
**
** A standard SQLite result code is returned (SQLITE_OK, SQLITE_NOMEM, etc.)
** When deleting a directory of files, if the deletion of any one
** file fails (for example due to an I/O error), then this routine
** returns immediately, with the error code, and does not try to 
** delete any of the other files in the specified directory.
**
** All files are removed from quota management and deleted from disk.
** However, no attempt is made to remove empty directories.
**
** This routine is a no-op for files that are not under quota management.
*/
int sqlite3_quota_remove(const char *zFilename);

#ifdef __cplusplus
}  /* end of the 'extern "C"' block */
#endif
#endif /* _QUOTA_H_ */

Added test/quota-glob.test.















































































































































































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# 2011 December 1
#
# 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.
#
#***********************************************************************
#
# Tests for the glob-style string compare operator embedded in the
# quota shim.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

catch { unset testnum }
catch { unset pattern }
catch { unset text }
catch { unset ans }

foreach {testnum pattern text ans} {
   1  abcdefg   abcdefg   1
   2  abcdefG   abcdefg   0
   3  abcdef    abcdefg   0
   4  abcdefgh  abcdefg   0
   5  abcdef?   abcdefg   1
   6  abcdef?   abcdef    0
   7  abcdef?   abcdefgh  0
   8  abcdefg   abcdef?   0
   9  abcdef?   abcdef?   1
  10  abc/def   abc/def   1
  11  abc//def  abc/def   0
  12  */abc/*   x/abc/y   1
  13  */abc/*   /abc/     1
  16  */abc/*   x///a/ab/abc   0
  17  */abc/*   x//a/ab/abc/   1
  16  */abc/*   x///a/ab/abc   0
  17  */abc/*   x//a/ab/abc/   1
  18  **/abc/** x//a/ab/abc/   1
  19  *?/abc/*? x//a/ab/abc/y  1
  20  ?*/abc/?* x//a/ab/abc/y  1
  21  {abc[cde]efg}   abcbefg  0
  22  {abc[cde]efg}   abccefg  1
  23  {abc[cde]efg}   abcdefg  1
  24  {abc[cde]efg}   abceefg  1
  25  {abc[cde]efg}   abcfefg  0
  26  {abc[^cde]efg}  abcbefg  1
  27  {abc[^cde]efg}  abccefg  0
  28  {abc[^cde]efg}  abcdefg  0
  29  {abc[^cde]efg}  abceefg  0
  30  {abc[^cde]efg}  abcfefg  1
  31  {abc[c-e]efg}   abcbefg  0
  32  {abc[c-e]efg}   abccefg  1
  33  {abc[c-e]efg}   abcdefg  1
  34  {abc[c-e]efg}   abceefg  1
  35  {abc[c-e]efg}   abcfefg  0
  36  {abc[^c-e]efg}  abcbefg  1
  37  {abc[^c-e]efg}  abccefg  0
  38  {abc[^c-e]efg}  abcdefg  0
  39  {abc[^c-e]efg}  abceefg  0
  40  {abc[^c-e]efg}  abcfefg  1
  41  {abc[c-e]efg}   abc-efg  0
  42  {abc[-ce]efg}   abc-efg  1
  43  {abc[ce-]efg}   abc-efg  1
  44  {abc[][*?]efg}  {abc]efg} 1
  45  {abc[][*?]efg}  {abc*efg} 1
  46  {abc[][*?]efg}  {abc?efg} 1
  47  {abc[][*?]efg}  {abc[efg} 1
  48  {abc[^][*?]efg} {abc]efg} 0
  49  {abc[^][*?]efg} {abc*efg} 0
  50  {abc[^][*?]efg} {abc?efg} 0
  51  {abc[^][*?]efg} {abc[efg} 0
  52  {abc[^][*?]efg} {abcdefg} 1
  53  {*[xyz]efg}     {abcxefg} 1
  54  {*[xyz]efg}     {abcwefg} 0
} {
  do_test quota-glob-$testnum.1 {
    sqlite3_quota_glob $::pattern $::text
  } $::ans
  do_test quota-glob-$testnum.2 {
    sqlite3_quota_glob $::pattern [string map {/ \\} $::text]
  } $::ans
}
finish_test

Changes to test/quota.test.

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#   quota-2.4.*: Try to shutdown the quota system before closing the db
#                file. Check that this fails and the quota system still works
#                afterwards. Then close the database and successfully shut
#                down the quota system.
#   
sqlite3_quota_initialize "" 1


proc quota_check {filename limitvar size} {
  upvar $limitvar limit

  lappend ::quota [set limit] $size
  if {[info exists ::quota_request_ok]} { set limit $size }
}








>







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#   quota-2.4.*: Try to shutdown the quota system before closing the db
#                file. Check that this fails and the quota system still works
#                afterwards. Then close the database and successfully shut
#                down the quota system.
#   
sqlite3_quota_initialize "" 1

unset -nocomplain quota_request_ok
proc quota_check {filename limitvar size} {
  upvar $limitvar limit

  lappend ::quota [set limit] $size
  if {[info exists ::quota_request_ok]} { set limit $size }
}

Added test/quota2.test.

























































































































































































































































































































































































































































































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# 2011 December 1
#
# 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.
#
#***********************************************************************
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/malloc_common.tcl

db close
sqlite3_quota_initialize "" 1

foreach dir {quota2a/x1 quota2a/x2 quota2a quota2b quota2c} {
  file delete -force $dir
}
foreach dir {quota2a quota2a/x1 quota2a/x2 quota2b quota2c} {
  file mkdir $dir
}

# The standard_path procedure converts a pathname into a standard format
# that is the same across platforms.
#
unset -nocomplain ::quota_pwd ::quota_mapping
set ::quota_pwd [string map {\\ /} [pwd]]
set ::quota_mapping [list $::quota_pwd PWD]
proc standard_path {x} {
  set x [string map {\\ /} $x]
  return [string map $::quota_mapping $x]
}

# The quota_check procedure is a callback from the quota handler.
# It has three arguments which are (1) the full pathname of the file
# that has gone over quota, (2) the quota limit, (3) the requested
# new quota size to cover the last write.  These three values are
# appended to the global variable $::quota.  The filename is processed
# to convert every \ character into / and to change the name of the
# working directory to PWD.  
#
# The quota is increased to the request if the ::quota_request_ok 
# global variable is true.
#
set ::quota {}
set ::quota_request_ok 0

proc quota_check {filename limitvar size} {
  upvar $limitvar limit
  lappend ::quota [standard_path $filename] [set limit] $size
  if {$::quota_request_ok} {set limit $size}
}

sqlite3_quota_set */quota2a/* 4000 quota_check
sqlite3_quota_set */quota2b/* 5000 quota_check

unset -nocomplain bigtext
for {set i 1} {$i<=1000} {incr i} {
  if {$i%10==0} {
    append bigtext [format "%06d\n" $i]
  } else {
    append bigtext [format "%06d " $i]
  }
}

catch { unset h1 }
catch { unset x }
do_test quota2-1.1 {
  set ::h1 [sqlite3_quota_fopen quota2a/xyz.txt w+b]
  sqlite3_quota_fwrite $::h1 1 7000 $bigtext
} {4000}
do_test quota2-1.2 {
  set ::quota
} {PWD/quota2a/xyz.txt 4000 7000}
do_test quota2-1.3 {
  sqlite3_quota_rewind $::h1
  set ::x [sqlite3_quota_fread $::h1 1001 7]
  string length $::x
} {3003}
do_test quota2-1.4 {
  string match $::x [string range $::bigtext 0 3002]
} {1}
do_test quota2-1.5 {
  sqlite3_quota_fseek $::h1 0 SEEK_END
  sqlite3_quota_ftell $::h1
} {4000}
do_test quota2-1.6 {
  sqlite3_quota_fseek $::h1 -100 SEEK_END
  sqlite3_quota_ftell $::h1
} {3900}
do_test quota2-1.7 {
  sqlite3_quota_fseek $::h1 -100 SEEK_CUR
  sqlite3_quota_ftell $::h1
} {3800}
do_test quota2-1.8 {
  sqlite3_quota_fseek $::h1 50 SEEK_CUR
  sqlite3_quota_ftell $::h1
} {3850}
do_test quota2-1.9 {
  sqlite3_quota_fseek $::h1 50 SEEK_SET
  sqlite3_quota_ftell $::h1
} {50}
do_test quota2-1.10 {
  sqlite3_quota_rewind $::h1
  sqlite3_quota_ftell $::h1
} {0}
do_test quota2-1.11 {
  standard_path [sqlite3_quota_dump]
} {{*/quota2b/* 5000 0} {*/quota2a/* 4000 4000 {PWD/quota2a/xyz.txt 4000 1 0}}}
do_test quota2-1.12 {
  sqlite3_quota_fclose $::h1
  standard_path [sqlite3_quota_dump]
} {{*/quota2b/* 5000 0} {*/quota2a/* 4000 4000 {PWD/quota2a/xyz.txt 4000 0 0}}}
do_test quota2-1.13 {
  sqlite3_quota_remove quota2a/xyz.txt
  standard_path [sqlite3_quota_dump]
} {{*/quota2b/* 5000 0} {*/quota2a/* 4000 0}}


set quota {}
do_test quota2-2.1 {
  set ::h1 [sqlite3_quota_fopen quota2c/xyz.txt w+b]
  sqlite3_quota_fwrite $::h1 1 7000 $bigtext
} {7000}
do_test quota2-2.2 {
  set ::quota
} {}
do_test quota2-2.3 {
  sqlite3_quota_rewind $::h1
  set ::x [sqlite3_quota_fread $::h1 1001 7]
  string length $::x
} {6006}
do_test quota2-2.4 {
  string match $::x [string range $::bigtext 0 6005]
} {1}
do_test quota2-2.5 {
  sqlite3_quota_fseek $::h1 0 SEEK_END
  sqlite3_quota_ftell $::h1
} {7000}
do_test quota2-2.6 {
  sqlite3_quota_fseek $::h1 -100 SEEK_END
  sqlite3_quota_ftell $::h1
} {6900}
do_test quota2-2.7 {
  sqlite3_quota_fseek $::h1 -100 SEEK_CUR
  sqlite3_quota_ftell $::h1
} {6800}
do_test quota2-2.8 {
  sqlite3_quota_fseek $::h1 50 SEEK_CUR
  sqlite3_quota_ftell $::h1
} {6850}
do_test quota2-2.9 {
  sqlite3_quota_fseek $::h1 50 SEEK_SET
  sqlite3_quota_ftell $::h1
} {50}
do_test quota2-2.10 {
  sqlite3_quota_rewind $::h1
  sqlite3_quota_ftell $::h1
} {0}
do_test quota2-2.11 {
  standard_path [sqlite3_quota_dump]
} {{*/quota2b/* 5000 0} {*/quota2a/* 4000 0}}
do_test quota2-2.12 {
  sqlite3_quota_fclose $::h1
  standard_path [sqlite3_quota_dump]
} {{*/quota2b/* 5000 0} {*/quota2a/* 4000 0}}

do_test quota2-3.1 {
  sqlite3_quota_set */quota2b/* 0 quota_check
  set ::h1 [sqlite3_quota_fopen quota2a/x1/a.txt a]
  sqlite3_quota_fwrite $::h1 10 10 $bigtext
} {10}
do_test quota2-3.2 {
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 100 {PWD/quota2a/x1/a.txt 100 1 0}}}
do_test quota2-3.3a {
  sqlite3_quota_fflush $::h1 0
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 100 {PWD/quota2a/x1/a.txt 100 1 0}}}
do_test quota2-3.3b {
  sqlite3_quota_fflush $::h1 1
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 100 {PWD/quota2a/x1/a.txt 100 1 0}}}
do_test quota2-3.3c {
  sqlite3_quota_fflush $::h1
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 100 {PWD/quota2a/x1/a.txt 100 1 0}}}
do_test quota2-3.4 {
  sqlite3_quota_fclose $::h1
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 100 {PWD/quota2a/x1/a.txt 100 0 0}}}
do_test quota2-3.5 {
  set ::h2 [sqlite3_quota_fopen quota2a/x2/b.txt a]
  sqlite3_quota_fwrite $::h2 10 20 $bigtext
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 300 {PWD/quota2a/x2/b.txt 200 1 0} {PWD/quota2a/x1/a.txt 100 0 0}}}
do_test quota2-3.6 {
  set ::h3 [sqlite3_quota_fopen quota2a/x1/c.txt a]
  sqlite3_quota_fwrite $::h3 10 50 $bigtext
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 800 {PWD/quota2a/x1/c.txt 500 1 0} {PWD/quota2a/x2/b.txt 200 1 0} {PWD/quota2a/x1/a.txt 100 0 0}}}
do_test quota2-3.7 {
  file exists quota2a/x1/a.txt
} {1}
do_test quota2-3.8 {
  file exists quota2a/x2/b.txt
} {1}
do_test quota2-3.9 {
  file exists quota2a/x1/c.txt
} {1}
do_test quota2-3.10 {
  sqlite3_quota_remove quota2a/x1
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 700 {PWD/quota2a/x1/c.txt 500 1 1} {PWD/quota2a/x2/b.txt 200 1 0}}}
do_test quota2-3.11 {
  sqlite3_quota_fclose $::h2
  sqlite3_quota_fclose $::h3
  standard_path [sqlite3_quota_dump]
} {{*/quota2a/* 4000 200 {PWD/quota2a/x2/b.txt 200 0 0}}}
do_test quota2-3.12 {
  file exists quota2a/x1/a.txt
} {0}
do_test quota2-3.13 {
  file exists quota2a/x2/b.txt
} {1}
do_test quota2-3.14 {
  file exists quota2a/x1/c.txt
} {0}

catch { sqlite3_quota_shutdown }
catch { unset quota_request_ok }
finish_test