--- a/engine/sqlite/src/callback.cpp	Wed May 26 10:44:32 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,378 +0,0 @@
-/*
-** 2005 May 23 
-**
-** 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 functions used to access the internal hash tables
-** of user defined functions and collation sequences.
-**
-** $Id: callback.cpp 1282 2008-11-13 09:31:33Z LarsPson $
-*/
-
-#include "sqliteInt.h"
-
-/*
-** Invoke the 'collation needed' callback to request a collation sequence
-** in the database text encoding of name zName, length nName.
-** If the collation sequence
-*/
-static void callCollNeeded(sqlite3 *db, const char *zName, int nName){
-  assert( !db->xCollNeeded || !db->xCollNeeded16 );
-  if( nName<0 ) nName = strlen(zName);
-  if( db->xCollNeeded ){
-    char *zExternal = sqlite3DbStrNDup(db, zName, nName);
-    if( !zExternal ) return;
-    db->xCollNeeded(db->pCollNeededArg, db, (int)ENC(db), zExternal);
-    sqlite3_free(zExternal);
-  }
-#ifndef SQLITE_OMIT_UTF16
-  if( db->xCollNeeded16 ){
-    char const *zExternal;
-    sqlite3_value *pTmp = sqlite3ValueNew(db);
-    sqlite3ValueSetStr(pTmp, nName, zName, SQLITE_UTF8, SQLITE_STATIC);
-    zExternal = (const char*)sqlite3ValueText(pTmp, SQLITE_UTF16NATIVE);
-    if( zExternal ){
-      db->xCollNeeded16(db->pCollNeededArg, db, (int)ENC(db), zExternal);
-    }
-    sqlite3ValueFree(pTmp);
-  }
-#endif
-}
-
-/*
-** This routine is called if the collation factory fails to deliver a
-** collation function in the best encoding but there may be other versions
-** of this collation function (for other text encodings) available. Use one
-** of these instead if they exist. Avoid a UTF-8 <-> UTF-16 conversion if
-** possible.
-*/
-static int synthCollSeq(sqlite3 *db, CollSeq *pColl){
-  CollSeq *pColl2;
-  char *z = pColl->zName;
-  int n = strlen(z);
-  int i;
-  static const u8 aEnc[] = { SQLITE_UTF16BE, SQLITE_UTF16LE, SQLITE_UTF8 };
-  for(i=0; i<3; i++){
-    pColl2 = sqlite3FindCollSeq(db, aEnc[i], z, n, 0);
-    if( pColl2->xCmp!=0 ){
-      memcpy(pColl, pColl2, sizeof(CollSeq));
-      pColl->xDel = 0;         /* Do not copy the destructor */
-      return SQLITE_OK;
-    }
-  }
-  return SQLITE_ERROR;
-}
-
-/*
-** This function is responsible for invoking the collation factory callback
-** or substituting a collation sequence of a different encoding when the
-** requested collation sequence is not available in the database native
-** encoding.
-** 
-** If it is not NULL, then pColl must point to the database native encoding 
-** collation sequence with name zName, length nName.
-**
-** The return value is either the collation sequence to be used in database
-** db for collation type name zName, length nName, or NULL, if no collation
-** sequence can be found.
-*/
-CollSeq *sqlite3GetCollSeq(
-  sqlite3* db, 
-  CollSeq *pColl, 
-  const char *zName, 
-  int nName
-){
-  CollSeq *p;
-
-  p = pColl;
-  if( !p ){
-    p = sqlite3FindCollSeq(db, ENC(db), zName, nName, 0);
-  }
-  if( !p || !p->xCmp ){
-    /* No collation sequence of this type for this encoding is registered.
-    ** Call the collation factory to see if it can supply us with one.
-    */
-    callCollNeeded(db, zName, nName);
-    p = sqlite3FindCollSeq(db, ENC(db), zName, nName, 0);
-  }
-  if( p && !p->xCmp && synthCollSeq(db, p) ){
-    p = 0;
-  }
-  assert( !p || p->xCmp );
-  return p;
-}
-
-/*
-** This routine is called on a collation sequence before it is used to
-** check that it is defined. An undefined collation sequence exists when
-** a database is loaded that contains references to collation sequences
-** that have not been defined by sqlite3_create_collation() etc.
-**
-** If required, this routine calls the 'collation needed' callback to
-** request a definition of the collating sequence. If this doesn't work, 
-** an equivalent collating sequence that uses a text encoding different
-** from the main database is substituted, if one is available.
-*/
-int sqlite3CheckCollSeq(Parse *pParse, CollSeq *pColl){
-  if( pColl ){
-    const char *zName = pColl->zName;
-    CollSeq *p = sqlite3GetCollSeq(pParse->db, pColl, zName, -1);
-    if( !p ){
-      if( pParse->nErr==0 ){
-        sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
-      }
-      pParse->nErr++;
-      return SQLITE_ERROR;
-    }
-    assert( p==pColl );
-  }
-  return SQLITE_OK;
-}
-
-
-
-/*
-** Locate and return an entry from the db.aCollSeq hash table. If the entry
-** specified by zName and nName is not found and parameter 'create' is
-** true, then create a new entry. Otherwise return NULL.
-**
-** Each pointer stored in the sqlite3.aCollSeq hash table contains an
-** array of three CollSeq structures. The first is the collation sequence
-** prefferred for UTF-8, the second UTF-16le, and the third UTF-16be.
-**
-** Stored immediately after the three collation sequences is a copy of
-** the collation sequence name. A pointer to this string is stored in
-** each collation sequence structure.
-*/
-static CollSeq *findCollSeqEntry(
-  sqlite3 *db,
-  const char *zName,
-  int nName,
-  int create
-){
-  CollSeq *pColl;
-  if( nName<0 ) nName = strlen(zName);
-  pColl = (CollSeq*)sqlite3HashFind(&db->aCollSeq, zName, nName);
-
-  if( 0==pColl && create ){
-    pColl = (CollSeq*)sqlite3DbMallocZero(db, 3*sizeof(*pColl) + nName + 1 );
-    if( pColl ){
-      CollSeq *pDel = 0;
-      pColl[0].zName = (char*)&pColl[3];
-      pColl[0].enc = SQLITE_UTF8;
-      pColl[1].zName = (char*)&pColl[3];
-      pColl[1].enc = SQLITE_UTF16LE;
-      pColl[2].zName = (char*)&pColl[3];
-      pColl[2].enc = SQLITE_UTF16BE;
-      memcpy(pColl[0].zName, zName, nName);
-      pColl[0].zName[nName] = 0;
-      pDel = (CollSeq*)sqlite3HashInsert(&db->aCollSeq, pColl[0].zName, nName, pColl);
-
-      /* If a malloc() failure occured in sqlite3HashInsert(), it will 
-      ** return the pColl pointer to be deleted (because it wasn't added
-      ** to the hash table).
-      */
-      assert( pDel==0 || pDel==pColl );
-      if( pDel!=0 ){
-        db->mallocFailed = 1;
-        sqlite3_free(pDel);
-        pColl = 0;
-      }
-    }
-  }
-  return pColl;
-}
-
-/*
-** Parameter zName points to a UTF-8 encoded string nName bytes long.
-** Return the CollSeq* pointer for the collation sequence named zName
-** for the encoding 'enc' from the database 'db'.
-**
-** If the entry specified is not found and 'create' is true, then create a
-** new entry.  Otherwise return NULL.
-**
-** A separate function sqlite3LocateCollSeq() is a wrapper around
-** this routine.  sqlite3LocateCollSeq() invokes the collation factory
-** if necessary and generates an error message if the collating sequence
-** cannot be found.
-*/
-CollSeq *sqlite3FindCollSeq(
-  sqlite3 *db,
-  u8 enc,
-  const char *zName,
-  int nName,
-  int create
-){
-  CollSeq *pColl;
-  if( zName ){
-    pColl = findCollSeqEntry(db, zName, nName, create);
-  }else{
-    pColl = db->pDfltColl;
-  }
-  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
-  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
-  if( pColl ) pColl += enc-1;
-  return pColl;
-}
-
-/*
-** Locate a user function given a name, a number of arguments and a flag
-** indicating whether the function prefers UTF-16 over UTF-8.  Return a
-** pointer to the FuncDef structure that defines that function, or return
-** NULL if the function does not exist.
-**
-** If the createFlag argument is true, then a new (blank) FuncDef
-** structure is created and liked into the "db" structure if a
-** no matching function previously existed.  When createFlag is true
-** and the nArg parameter is -1, then only a function that accepts
-** any number of arguments will be returned.
-**
-** If createFlag is false and nArg is -1, then the first valid
-** function found is returned.  A function is valid if either xFunc
-** or xStep is non-zero.
-**
-** If createFlag is false, then a function with the required name and
-** number of arguments may be returned even if the eTextRep flag does not
-** match that requested.
-*/
-FuncDef *sqlite3FindFunction(
-  sqlite3 *db,       /* An open database */
-  const char *zName, /* Name of the function.  Not null-terminated */
-  int nName,         /* Number of characters in the name */
-  int nArg,          /* Number of arguments.  -1 means any number */
-  u8 enc,            /* Preferred text encoding */
-  int createFlag     /* Create new entry if true and does not otherwise exist */
-){
-  FuncDef *p;         /* Iterator variable */
-  FuncDef *pFirst;    /* First function with this name */
-  FuncDef *pBest = 0; /* Best match found so far */
-  int bestmatch = 0;  
-
-
-  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
-  if( nArg<-1 ) nArg = -1;
-
-  pFirst = (FuncDef*)sqlite3HashFind(&db->aFunc, zName, nName);
-  for(p=pFirst; p; p=p->pNext){
-    /* During the search for the best function definition, bestmatch is set
-    ** as follows to indicate the quality of the match with the definition
-    ** pointed to by pBest:
-    **
-    ** 0: pBest is NULL. No match has been found.
-    ** 1: A variable arguments function that prefers UTF-8 when a UTF-16
-    **    encoding is requested, or vice versa.
-    ** 2: A variable arguments function that uses UTF-16BE when UTF-16LE is
-    **    requested, or vice versa.
-    ** 3: A variable arguments function using the same text encoding.
-    ** 4: A function with the exact number of arguments requested that
-    **    prefers UTF-8 when a UTF-16 encoding is requested, or vice versa.
-    ** 5: A function with the exact number of arguments requested that
-    **    prefers UTF-16LE when UTF-16BE is requested, or vice versa.
-    ** 6: An exact match.
-    **
-    ** A larger value of 'matchqual' indicates a more desirable match.
-    */
-    if( p->nArg==-1 || p->nArg==nArg || nArg==-1 ){
-      int match = 1;          /* Quality of this match */
-      if( p->nArg==nArg || nArg==-1 ){
-        match = 4;
-      }
-      if( enc==p->iPrefEnc ){
-        match += 2;
-      }
-      else if( (enc==SQLITE_UTF16LE && p->iPrefEnc==SQLITE_UTF16BE) ||
-               (enc==SQLITE_UTF16BE && p->iPrefEnc==SQLITE_UTF16LE) ){
-        match += 1;
-      }
-
-      if( match>bestmatch ){
-        pBest = p;
-        bestmatch = match;
-      }
-    }
-  }
-
-  /* If the createFlag parameter is true, and the seach did not reveal an
-  ** exact match for the name, number of arguments and encoding, then add a
-  ** new entry to the hash table and return it.
-  */
-  if( createFlag && bestmatch<6 && 
-      (pBest = (FuncDef*)sqlite3DbMallocZero(db, sizeof(*pBest)+nName))!=0 ){
-    pBest->nArg = nArg;
-    pBest->pNext = pFirst;
-    pBest->iPrefEnc = enc;
-    memcpy(pBest->zName, zName, nName);
-    pBest->zName[nName] = 0;
-    if( pBest==sqlite3HashInsert(&db->aFunc,pBest->zName,nName,(void*)pBest) ){
-      db->mallocFailed = 1;
-      sqlite3_free(pBest);
-      return 0;
-    }
-  }
-
-  if( pBest && (pBest->xStep || pBest->xFunc || createFlag) ){
-    return pBest;
-  }
-  return 0;
-}
-
-/*
-** Free all resources held by the schema structure. The void* argument points
-** at a Schema struct. This function does not call sqlite3_free() on the 
-** pointer itself, it just cleans up subsiduary resources (i.e. the contents
-** of the schema hash tables).
-*/
-void sqlite3SchemaFree(void *p){
-  Hash temp1;
-  Hash temp2;
-  HashElem *pElem;
-  Schema *pSchema = (Schema *)p;
-
-  temp1 = pSchema->tblHash;
-  temp2 = pSchema->trigHash;
-  sqlite3HashInit(&pSchema->trigHash, SQLITE_HASH_STRING, 0);
-  sqlite3HashClear(&pSchema->aFKey);
-  sqlite3HashClear(&pSchema->idxHash);
-  for(pElem=sqliteHashFirst(&temp2); pElem; pElem=sqliteHashNext(pElem)){
-    sqlite3DeleteTrigger((Trigger*)sqliteHashData(pElem));
-  }
-  sqlite3HashClear(&temp2);
-  sqlite3HashInit(&pSchema->tblHash, SQLITE_HASH_STRING, 0);
-  for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
-    Table *pTab = (Table*)sqliteHashData(pElem);
-    sqlite3DeleteTable(pTab);
-  }
-  sqlite3HashClear(&temp1);
-  pSchema->pSeqTab = 0;
-  pSchema->flags &= ~DB_SchemaLoaded;
-}
-
-/*
-** Find and return the schema associated with a BTree.  Create
-** a new one if necessary.
-*/
-Schema *sqlite3SchemaGet(sqlite3 *db, Btree *pBt){
-  Schema * p;
-  if( pBt ){
-    p = (Schema *)sqlite3BtreeSchema(pBt, sizeof(Schema), sqlite3SchemaFree);
-  }else{
-    p = (Schema *)sqlite3MallocZero(sizeof(Schema));
-  }
-  if( !p ){
-    db->mallocFailed = 1;
-  }else if ( 0==p->file_format ){
-    sqlite3HashInit(&p->tblHash, SQLITE_HASH_STRING, 0);
-    sqlite3HashInit(&p->idxHash, SQLITE_HASH_STRING, 0);
-    sqlite3HashInit(&p->trigHash, SQLITE_HASH_STRING, 0);
-    sqlite3HashInit(&p->aFKey, SQLITE_HASH_STRING, 1);
-    p->enc = SQLITE_UTF8;
-  }
-  return p;
-}