[sqlite] Remove obsolete reference version 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/src/callback.c

Index: third_party/sqlite/sqlite-src-3080704/src/callback.c
diff --git a/third_party/sqlite/sqlite-src-3080704/src/callback.c b/third_party/sqlite/sqlite-src-3080704/src/callback.c
deleted file mode 100644
index cd213b4b28bee0af16c4d4e57c0017cacf6faeff..0000000000000000000000000000000000000000
--- a/third_party/sqlite/sqlite-src-3080704/src/callback.c
+++ /dev/null
@@ -1,477 +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.
-*/
-
-#include "sqliteInt.h"
-
-/*
-** Invoke the 'collation needed' callback to request a collation sequence
-** in the encoding enc of name zName, length nName.
-*/
-static void callCollNeeded(sqlite3 *db, int enc, const char *zName){
-  assert( !db->xCollNeeded || !db->xCollNeeded16 );
-  if( db->xCollNeeded ){
-    char *zExternal = sqlite3DbStrDup(db, zName);
-    if( !zExternal ) return;
-    db->xCollNeeded(db->pCollNeededArg, db, enc, zExternal);
-    sqlite3DbFree(db, zExternal);
-  }
-#ifndef SQLITE_OMIT_UTF16
-  if( db->xCollNeeded16 ){
-    char const *zExternal;
-    sqlite3_value *pTmp = sqlite3ValueNew(db);
-    sqlite3ValueSetStr(pTmp, -1, zName, SQLITE_UTF8, SQLITE_STATIC);
-    zExternal = 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 i;
-  static const u8 aEnc[] = { SQLITE_UTF16BE, SQLITE_UTF16LE, SQLITE_UTF8 };
-  for(i=0; i<3; i++){
-    pColl2 = sqlite3FindCollSeq(db, aEnc[i], z, 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 desired 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.  If no collation is found, leave an error message.
-**
-** See also: sqlite3LocateCollSeq(), sqlite3FindCollSeq()
-*/
-CollSeq *sqlite3GetCollSeq(
-  Parse *pParse,        /* Parsing context */
-  u8 enc,               /* The desired encoding for the collating sequence */
-  CollSeq *pColl,       /* Collating sequence with native encoding, or NULL */
-  const char *zName     /* Collating sequence name */
-){
-  CollSeq *p;
-  sqlite3 *db = pParse->db;
-
-  p = pColl;
-  if( !p ){
-    p = sqlite3FindCollSeq(db, enc, zName, 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, enc, zName);
-    p = sqlite3FindCollSeq(db, enc, zName, 0);
-  }
-  if( p && !p->xCmp && synthCollSeq(db, p) ){
-    p = 0;
-  }
-  assert( !p || p->xCmp );
-  if( p==0 ){
-    sqlite3ErrorMsg(pParse, "no such collation sequence: %s", zName);
-  }
-  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;
-    sqlite3 *db = pParse->db;
-    CollSeq *p = sqlite3GetCollSeq(pParse, ENC(db), pColl, zName);
-    if( !p ){
-      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
-** preferred 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,          /* Database connection */
-  const char *zName,    /* Name of the collating sequence */
-  int create            /* Create a new entry if true */
-){
-  CollSeq *pColl;
-  pColl = sqlite3HashFind(&db->aCollSeq, zName);
-
-  if( 0==pColl && create ){
-    int nName = sqlite3Strlen30(zName);
-    pColl = 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 = sqlite3HashInsert(&db->aCollSeq, pColl[0].zName, pColl);
-
-      /* If a malloc() failure occurred 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;
-        sqlite3DbFree(db, 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.
-**
-** See also: sqlite3LocateCollSeq(), sqlite3GetCollSeq()
-*/
-CollSeq *sqlite3FindCollSeq(
-  sqlite3 *db,
-  u8 enc,
-  const char *zName,
-  int create
-){
-  CollSeq *pColl;
-  if( zName ){
-    pColl = findCollSeqEntry(db, zName, 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;
-}
-
-/* During the search for the best function definition, this procedure
-** is called to test how well the function passed as the first argument
-** matches the request for a function with nArg arguments in a system
-** that uses encoding enc. The value returned indicates how well the
-** request is matched. A higher value indicates a better match.
-**
-** If nArg is -1 that means to only return a match (non-zero) if p->nArg
-** is also -1.  In other words, we are searching for a function that
-** takes a variable number of arguments.
-**
-** If nArg is -2 that means that we are searching for any function 
-** regardless of the number of arguments it uses, so return a positive
-** match score for any
-**
-** The returned value is always between 0 and 6, as follows:
-**
-** 0: Not a match.
-** 1: UTF8/16 conversion required and function takes any number of arguments.
-** 2: UTF16 byte order change required and function takes any number of args.
-** 3: encoding matches and function takes any number of arguments
-** 4: UTF8/16 conversion required - argument count matches exactly
-** 5: UTF16 byte order conversion required - argument count matches exactly
-** 6: Perfect match:  encoding and argument count match exactly.
-**
-** If nArg==(-2) then any function with a non-null xStep or xFunc is
-** a perfect match and any function with both xStep and xFunc NULL is
-** a non-match.
-*/
-#define FUNC_PERFECT_MATCH 6  /* The score for a perfect match */
-static int matchQuality(
-  FuncDef *p,     /* The function we are evaluating for match quality */
-  int nArg,       /* Desired number of arguments.  (-1)==any */
-  u8 enc          /* Desired text encoding */
-){
-  int match;
-
-  /* nArg of -2 is a special case */
-  if( nArg==(-2) ) return (p->xFunc==0 && p->xStep==0) ? 0 : FUNC_PERFECT_MATCH;
-
-  /* Wrong number of arguments means "no match" */
-  if( p->nArg!=nArg && p->nArg>=0 ) return 0;
-
-  /* Give a better score to a function with a specific number of arguments
-  ** than to function that accepts any number of arguments. */
-  if( p->nArg==nArg ){
-    match = 4;
-  }else{
-    match = 1;
-  }
-
-  /* Bonus points if the text encoding matches */
-  if( enc==(p->funcFlags & SQLITE_FUNC_ENCMASK) ){
-    match += 2;  /* Exact encoding match */
-  }else if( (enc & p->funcFlags & 2)!=0 ){
-    match += 1;  /* Both are UTF16, but with different byte orders */
-  }
-
-  return match;
-}
-
-/*
-** Search a FuncDefHash for a function with the given name.  Return
-** a pointer to the matching FuncDef if found, or 0 if there is no match.
-*/
-static FuncDef *functionSearch(
-  FuncDefHash *pHash,  /* Hash table to search */
-  int h,               /* Hash of the name */
-  const char *zFunc,   /* Name of function */
-  int nFunc            /* Number of bytes in zFunc */
-){
-  FuncDef *p;
-  for(p=pHash->a[h]; p; p=p->pHash){
-    if( sqlite3StrNICmp(p->zName, zFunc, nFunc)==0 && p->zName[nFunc]==0 ){
-      return p;
-    }
-  }
-  return 0;
-}
-
-/*
-** Insert a new FuncDef into a FuncDefHash hash table.
-*/
-void sqlite3FuncDefInsert(
-  FuncDefHash *pHash,  /* The hash table into which to insert */
-  FuncDef *pDef        /* The function definition to insert */
-){
-  FuncDef *pOther;
-  int nName = sqlite3Strlen30(pDef->zName);
-  u8 c1 = (u8)pDef->zName[0];
-  int h = (sqlite3UpperToLower[c1] + nName) % ArraySize(pHash->a);
-  pOther = functionSearch(pHash, h, pDef->zName, nName);
-  if( pOther ){
-    assert( pOther!=pDef && pOther->pNext!=pDef );
-    pDef->pNext = pOther->pNext;
-    pOther->pNext = pDef;
-  }else{
-    pDef->pNext = 0;
-    pDef->pHash = pHash->a[h];
-    pHash->a[h] = pDef;
-  }
-}
-  
-  
-
-/*
-** 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.
-**
-** If nArg is -2, then the first valid function found is returned.  A
-** function is valid if either xFunc or xStep is non-zero.  The nArg==(-2)
-** case is used to see if zName is a valid function name for some number
-** of arguments.  If nArg is -2, then createFlag must be 0.
-**
-** 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 */
-  u8 createFlag      /* Create new entry if true and does not otherwise exist */
-){
-  FuncDef *p;         /* Iterator variable */
-  FuncDef *pBest = 0; /* Best match found so far */
-  int bestScore = 0;  /* Score of best match */
-  int h;              /* Hash value */
-
-  assert( nArg>=(-2) );
-  assert( nArg>=(-1) || createFlag==0 );
-  h = (sqlite3UpperToLower[(u8)zName[0]] + nName) % ArraySize(db->aFunc.a);
-
-  /* First search for a match amongst the application-defined functions.
-  */
-  p = functionSearch(&db->aFunc, h, zName, nName);
-  while( p ){
-    int score = matchQuality(p, nArg, enc);
-    if( score>bestScore ){
-      pBest = p;
-      bestScore = score;
-    }
-    p = p->pNext;
-  }
-
-  /* If no match is found, search the built-in functions.
-  **
-  ** If the SQLITE_PreferBuiltin flag is set, then search the built-in
-  ** functions even if a prior app-defined function was found.  And give
-  ** priority to built-in functions.
-  **
-  ** Except, if createFlag is true, that means that we are trying to
-  ** install a new function.  Whatever FuncDef structure is returned it will
-  ** have fields overwritten with new information appropriate for the
-  ** new function.  But the FuncDefs for built-in functions are read-only.
-  ** So we must not search for built-ins when creating a new function.
-  */ 
-  if( !createFlag && (pBest==0 || (db->flags & SQLITE_PreferBuiltin)!=0) ){
-    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-    bestScore = 0;
-    p = functionSearch(pHash, h, zName, nName);
-    while( p ){
-      int score = matchQuality(p, nArg, enc);
-      if( score>bestScore ){
-        pBest = p;
-        bestScore = score;
-      }
-      p = p->pNext;
-    }
-  }
-
-  /* If the createFlag parameter is true and the search 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 && bestScore<FUNC_PERFECT_MATCH && 
-      (pBest = sqlite3DbMallocZero(db, sizeof(*pBest)+nName+1))!=0 ){
-    pBest->zName = (char *)&pBest[1];
-    pBest->nArg = (u16)nArg;
-    pBest->funcFlags = enc;
-    memcpy(pBest->zName, zName, nName);
-    pBest->zName[nName] = 0;
-    sqlite3FuncDefInsert(&db->aFunc, pBest);
-  }
-
-  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 sqlite3DbFree(db, ) on the 
-** pointer itself, it just cleans up subsidiary resources (i.e. the contents
-** of the schema hash tables).
-**
-** The Schema.cache_size variable is not cleared.
-*/
-void sqlite3SchemaClear(void *p){
-  Hash temp1;
-  Hash temp2;
-  HashElem *pElem;
-  Schema *pSchema = (Schema *)p;
-
-  temp1 = pSchema->tblHash;
-  temp2 = pSchema->trigHash;
-  sqlite3HashInit(&pSchema->trigHash);
-  sqlite3HashClear(&pSchema->idxHash);
-  for(pElem=sqliteHashFirst(&temp2); pElem; pElem=sqliteHashNext(pElem)){
-    sqlite3DeleteTrigger(0, (Trigger*)sqliteHashData(pElem));
-  }
-  sqlite3HashClear(&temp2);
-  sqlite3HashInit(&pSchema->tblHash);
-  for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
-    Table *pTab = sqliteHashData(pElem);
-    sqlite3DeleteTable(0, pTab);
-  }
-  sqlite3HashClear(&temp1);
-  sqlite3HashClear(&pSchema->fkeyHash);
-  pSchema->pSeqTab = 0;
-  if( pSchema->schemaFlags & DB_SchemaLoaded ){
-    pSchema->iGeneration++;
-    pSchema->schemaFlags &= ~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), sqlite3SchemaClear);
-  }else{
-    p = (Schema *)sqlite3DbMallocZero(0, sizeof(Schema));
-  }
-  if( !p ){
-    db->mallocFailed = 1;
-  }else if ( 0==p->file_format ){
-    sqlite3HashInit(&p->tblHash);
-    sqlite3HashInit(&p->idxHash);
-    sqlite3HashInit(&p->trigHash);
-    sqlite3HashInit(&p->fkeyHash);
-    p->enc = SQLITE_UTF8;
-  }
-  return p;
-}