persistentstorage/sql/SQLite/hash.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Sat, 20 Feb 2010 00:33:55 +0200
branchRCL_3
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parent 0 08ec8eefde2f
permissions -rw-r--r--
Revision: 201007 Kit: 201007
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/*
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** 2001 September 22
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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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** This is the implementation of generic hash-tables
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** used in SQLite.
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**
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** $Id: hash.c,v 1.30 2008/06/20 14:59:51 danielk1977 Exp $
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*/
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#include "sqliteInt.h"
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#include <assert.h>
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/* Turn bulk memory into a hash table object by initializing the
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** fields of the Hash structure.
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**
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** "pNew" is a pointer to the hash table that is to be initialized.
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** keyClass is one of the constants SQLITE_HASH_INT, SQLITE_HASH_POINTER,
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** SQLITE_HASH_BINARY, or SQLITE_HASH_STRING.  The value of keyClass 
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** determines what kind of key the hash table will use.  "copyKey" is
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** true if the hash table should make its own private copy of keys and
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** false if it should just use the supplied pointer.  CopyKey only makes
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** sense for SQLITE_HASH_STRING and SQLITE_HASH_BINARY and is ignored
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** for other key classes.
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*/
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void sqlite3HashInit(Hash *pNew, int keyClass, int copyKey){
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  assert( pNew!=0 );
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  assert( keyClass>=SQLITE_HASH_STRING && keyClass<=SQLITE_HASH_BINARY );
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  pNew->keyClass = keyClass;
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#if 0
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  if( keyClass==SQLITE_HASH_POINTER || keyClass==SQLITE_HASH_INT ) copyKey = 0;
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#endif
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  pNew->copyKey = copyKey;
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  pNew->first = 0;
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  pNew->count = 0;
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  pNew->htsize = 0;
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  pNew->ht = 0;
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}
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/* Remove all entries from a hash table.  Reclaim all memory.
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** Call this routine to delete a hash table or to reset a hash table
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** to the empty state.
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*/
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void sqlite3HashClear(Hash *pH){
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  HashElem *elem;         /* For looping over all elements of the table */
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  assert( pH!=0 );
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  elem = pH->first;
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  pH->first = 0;
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  sqlite3_free(pH->ht);
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  pH->ht = 0;
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  pH->htsize = 0;
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  while( elem ){
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    HashElem *next_elem = elem->next;
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    if( pH->copyKey && elem->pKey ){
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      sqlite3_free(elem->pKey);
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    }
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    sqlite3_free(elem);
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    elem = next_elem;
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  }
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  pH->count = 0;
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}
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#if 0 /* NOT USED */
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/*
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** Hash and comparison functions when the mode is SQLITE_HASH_INT
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*/
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static int intHash(const void *pKey, int nKey){
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  return nKey ^ (nKey<<8) ^ (nKey>>8);
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}
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static int intCompare(const void *pKey1, int n1, const void *pKey2, int n2){
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  return n2 - n1;
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}
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#endif
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#if 0 /* NOT USED */
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/*
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** Hash and comparison functions when the mode is SQLITE_HASH_POINTER
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*/
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static int ptrHash(const void *pKey, int nKey){
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  uptr x = Addr(pKey);
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  return x ^ (x<<8) ^ (x>>8);
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}
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static int ptrCompare(const void *pKey1, int n1, const void *pKey2, int n2){
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  if( pKey1==pKey2 ) return 0;
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  if( pKey1<pKey2 ) return -1;
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  return 1;
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}
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#endif
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/*
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** Hash and comparison functions when the mode is SQLITE_HASH_STRING
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*/
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static int strHash(const void *pKey, int nKey){
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  const char *z = (const char *)pKey;
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  int h = 0;
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  if( nKey<=0 ) nKey = strlen(z);
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  while( nKey > 0  ){
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    h = (h<<3) ^ h ^ sqlite3UpperToLower[(unsigned char)*z++];
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    nKey--;
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  }
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  return h & 0x7fffffff;
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}
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static int strCompare(const void *pKey1, int n1, const void *pKey2, int n2){
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  if( n1!=n2 ) return 1;
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  return sqlite3StrNICmp((const char*)pKey1,(const char*)pKey2,n1);
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}
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   114
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   115
/*
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** Hash and comparison functions when the mode is SQLITE_HASH_BINARY
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   117
*/
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   118
static int binHash(const void *pKey, int nKey){
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  int h = 0;
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  const char *z = (const char *)pKey;
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   121
  while( nKey-- > 0 ){
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    h = (h<<3) ^ h ^ *(z++);
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  }
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  return h & 0x7fffffff;
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   125
}
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   126
static int binCompare(const void *pKey1, int n1, const void *pKey2, int n2){
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  if( n1!=n2 ) return 1;
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  return memcmp(pKey1,pKey2,n1);
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}
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   130
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   131
/*
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** Return a pointer to the appropriate hash function given the key class.
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**
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** The C syntax in this function definition may be unfamilar to some 
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   135
** programmers, so we provide the following additional explanation:
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   136
**
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** The name of the function is "hashFunction".  The function takes a
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** single parameter "keyClass".  The return value of hashFunction()
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** is a pointer to another function.  Specifically, the return value
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** of hashFunction() is a pointer to a function that takes two parameters
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** with types "const void*" and "int" and returns an "int".
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   142
*/
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   143
static int (*hashFunction(int keyClass))(const void*,int){
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   144
#if 0  /* HASH_INT and HASH_POINTER are never used */
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   145
  switch( keyClass ){
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   146
    case SQLITE_HASH_INT:     return &intHash;
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   147
    case SQLITE_HASH_POINTER: return &ptrHash;
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   148
    case SQLITE_HASH_STRING:  return &strHash;
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   149
    case SQLITE_HASH_BINARY:  return &binHash;;
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    default: break;
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   151
  }
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  return 0;
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   153
#else
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   154
  if( keyClass==SQLITE_HASH_STRING ){
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   155
    return &strHash;
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   156
  }else{
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   157
    assert( keyClass==SQLITE_HASH_BINARY );
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   158
    return &binHash;
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   159
  }
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   160
#endif
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   161
}
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   162
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   163
/*
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   164
** Return a pointer to the appropriate hash function given the key class.
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   165
**
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   166
** For help in interpreted the obscure C code in the function definition,
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   167
** see the header comment on the previous function.
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   168
*/
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   169
static int (*compareFunction(int keyClass))(const void*,int,const void*,int){
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   170
#if 0 /* HASH_INT and HASH_POINTER are never used */
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   171
  switch( keyClass ){
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   172
    case SQLITE_HASH_INT:     return &intCompare;
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   173
    case SQLITE_HASH_POINTER: return &ptrCompare;
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   174
    case SQLITE_HASH_STRING:  return &strCompare;
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   175
    case SQLITE_HASH_BINARY:  return &binCompare;
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   176
    default: break;
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   177
  }
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   178
  return 0;
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   179
#else
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   180
  if( keyClass==SQLITE_HASH_STRING ){
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   181
    return &strCompare;
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   182
  }else{
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   183
    assert( keyClass==SQLITE_HASH_BINARY );
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   184
    return &binCompare;
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   185
  }
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   186
#endif
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   187
}
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   188
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/* Link an element into the hash table
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   190
*/
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   191
static void insertElement(
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   192
  Hash *pH,              /* The complete hash table */
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   193
  struct _ht *pEntry,    /* The entry into which pNew is inserted */
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   194
  HashElem *pNew         /* The element to be inserted */
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   195
){
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   196
  HashElem *pHead;       /* First element already in pEntry */
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   197
  pHead = pEntry->chain;
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   198
  if( pHead ){
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   199
    pNew->next = pHead;
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   200
    pNew->prev = pHead->prev;
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   201
    if( pHead->prev ){ pHead->prev->next = pNew; }
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   202
    else             { pH->first = pNew; }
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   203
    pHead->prev = pNew;
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   204
  }else{
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   205
    pNew->next = pH->first;
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   206
    if( pH->first ){ pH->first->prev = pNew; }
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   207
    pNew->prev = 0;
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   208
    pH->first = pNew;
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   209
  }
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   210
  pEntry->count++;
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   211
  pEntry->chain = pNew;
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   212
}
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   213
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   214
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   215
/* Resize the hash table so that it cantains "new_size" buckets.
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   216
** "new_size" must be a power of 2.  The hash table might fail 
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   217
** to resize if sqlite3_malloc() fails.
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   218
*/
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   219
static void rehash(Hash *pH, int new_size){
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   220
  struct _ht *new_ht;            /* The new hash table */
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   221
  HashElem *elem, *next_elem;    /* For looping over existing elements */
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   222
  int (*xHash)(const void*,int); /* The hash function */
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#ifdef SQLITE_MALLOC_SOFT_LIMIT
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  if( new_size*sizeof(struct _ht)>SQLITE_MALLOC_SOFT_LIMIT ){
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    new_size = SQLITE_MALLOC_SOFT_LIMIT/sizeof(struct _ht);
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  }
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  if( new_size==pH->htsize ) return;
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#endif
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  /* There is a call to sqlite3_malloc() inside rehash(). If there is
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  ** already an allocation at pH->ht, then if this malloc() fails it
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  ** is benign (since failing to resize a hash table is a performance
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  ** hit only, not a fatal error).
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  */
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  if( pH->htsize>0 ) sqlite3BeginBenignMalloc();
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  new_ht = (struct _ht *)sqlite3MallocZero( new_size*sizeof(struct _ht) );
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  if( pH->htsize>0 ) sqlite3EndBenignMalloc();
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  if( new_ht==0 ) return;
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  sqlite3_free(pH->ht);
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  pH->ht = new_ht;
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  pH->htsize = new_size;
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  xHash = hashFunction(pH->keyClass);
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  for(elem=pH->first, pH->first=0; elem; elem = next_elem){
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    int h = (*xHash)(elem->pKey, elem->nKey) & (new_size-1);
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    next_elem = elem->next;
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    insertElement(pH, &new_ht[h], elem);
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  }
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}
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   251
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/* This function (for internal use only) locates an element in an
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** hash table that matches the given key.  The hash for this key has
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** already been computed and is passed as the 4th parameter.
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*/
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static HashElem *findElementGivenHash(
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  const Hash *pH,     /* The pH to be searched */
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  const void *pKey,   /* The key we are searching for */
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  int nKey,
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  int h               /* The hash for this key. */
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){
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  HashElem *elem;                /* Used to loop thru the element list */
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  int count;                     /* Number of elements left to test */
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  int (*xCompare)(const void*,int,const void*,int);  /* comparison function */
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  if( pH->ht ){
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    struct _ht *pEntry = &pH->ht[h];
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    elem = pEntry->chain;
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    count = pEntry->count;
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    xCompare = compareFunction(pH->keyClass);
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    while( count-- && elem ){
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      if( (*xCompare)(elem->pKey,elem->nKey,pKey,nKey)==0 ){ 
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        return elem;
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      }
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      elem = elem->next;
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    }
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  }
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  return 0;
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}
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/* Remove a single entry from the hash table given a pointer to that
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** element and a hash on the element's key.
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*/
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static void removeElementGivenHash(
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  Hash *pH,         /* The pH containing "elem" */
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  HashElem* elem,   /* The element to be removed from the pH */
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  int h             /* Hash value for the element */
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){
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  struct _ht *pEntry;
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  if( elem->prev ){
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    elem->prev->next = elem->next; 
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  }else{
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    pH->first = elem->next;
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  }
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  if( elem->next ){
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    elem->next->prev = elem->prev;
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  }
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  pEntry = &pH->ht[h];
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  if( pEntry->chain==elem ){
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    pEntry->chain = elem->next;
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  }
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  pEntry->count--;
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  if( pEntry->count<=0 ){
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    pEntry->chain = 0;
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  }
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   306
  if( pH->copyKey ){
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    sqlite3_free(elem->pKey);
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  }
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  sqlite3_free( elem );
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  pH->count--;
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   311
  if( pH->count<=0 ){
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    assert( pH->first==0 );
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    assert( pH->count==0 );
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   314
    sqlite3HashClear(pH);
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   315
  }
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   316
}
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   317
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/* Attempt to locate an element of the hash table pH with a key
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   319
** that matches pKey,nKey.  Return a pointer to the corresponding 
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   320
** HashElem structure for this element if it is found, or NULL
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   321
** otherwise.
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   322
*/
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   323
HashElem *sqlite3HashFindElem(const Hash *pH, const void *pKey, int nKey){
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  int h;             /* A hash on key */
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   325
  HashElem *elem;    /* The element that matches key */
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   326
  int (*xHash)(const void*,int);  /* The hash function */
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   327
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   328
  if( pH==0 || pH->ht==0 ) return 0;
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   329
  xHash = hashFunction(pH->keyClass);
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  assert( xHash!=0 );
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   331
  h = (*xHash)(pKey,nKey);
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   332
  elem = findElementGivenHash(pH,pKey,nKey, h % pH->htsize);
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  return elem;
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parents:
diff changeset
   334
}
08ec8eefde2f Revision: 201003
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parents:
diff changeset
   335
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   336
/* Attempt to locate an element of the hash table pH with a key
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
** that matches pKey,nKey.  Return the data for this element if it is
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
** found, or NULL if there is no match.
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   339
*/
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   340
void *sqlite3HashFind(const Hash *pH, const void *pKey, int nKey){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
  HashElem *elem;    /* The element that matches key */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   342
  elem = sqlite3HashFindElem(pH, pKey, nKey);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   343
  return elem ? elem->data : 0;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   344
}
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   346
/* Insert an element into the hash table pH.  The key is pKey,nKey
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   347
** and the data is "data".
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   348
**
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
** If no element exists with a matching key, then a new
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
** element is created.  A copy of the key is made if the copyKey
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
** flag is set.  NULL is returned.
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
**
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
** If another element already exists with the same key, then the
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
** new data replaces the old data and the old data is returned.
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
** The key is not copied in this instance.  If a malloc fails, then
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
** the new data is returned and the hash table is unchanged.
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
**
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
** If the "data" parameter to this function is NULL, then the
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
** element corresponding to "key" is removed from the hash table.
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
*/
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
void *sqlite3HashInsert(Hash *pH, const void *pKey, int nKey, void *data){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
  int hraw;             /* Raw hash value of the key */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
  int h;                /* the hash of the key modulo hash table size */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
  HashElem *elem;       /* Used to loop thru the element list */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
  HashElem *new_elem;   /* New element added to the pH */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
  int (*xHash)(const void*,int);  /* The hash function */
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
  assert( pH!=0 );
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
  xHash = hashFunction(pH->keyClass);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370
  assert( xHash!=0 );
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   371
  hraw = (*xHash)(pKey, nKey);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   372
  if( pH->htsize ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   373
    h = hraw % pH->htsize;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   374
    elem = findElementGivenHash(pH,pKey,nKey,h);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   375
    if( elem ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   376
      void *old_data = elem->data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   377
      if( data==0 ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   378
        removeElementGivenHash(pH,elem,h);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   379
      }else{
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   380
        elem->data = data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   381
        if( !pH->copyKey ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   382
          elem->pKey = (void *)pKey;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   383
        }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   384
        assert(nKey==elem->nKey);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   385
      }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   386
      return old_data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   387
    }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   388
  }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   389
  if( data==0 ) return 0;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
  new_elem = (HashElem*)sqlite3Malloc( sizeof(HashElem) );
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   391
  if( new_elem==0 ) return data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   392
  if( pH->copyKey && pKey!=0 ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   393
    new_elem->pKey = sqlite3Malloc( nKey );
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   394
    if( new_elem->pKey==0 ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   395
      sqlite3_free(new_elem);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   396
      return data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   397
    }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
    memcpy((void*)new_elem->pKey, pKey, nKey);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
  }else{
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   400
    new_elem->pKey = (void*)pKey;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
  }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   402
  new_elem->nKey = nKey;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   403
  pH->count++;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   404
  if( pH->htsize==0 ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   405
    rehash(pH, 128/sizeof(pH->ht[0]));
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   406
    if( pH->htsize==0 ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407
      pH->count = 0;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   408
      if( pH->copyKey ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   409
        sqlite3_free(new_elem->pKey);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   410
      }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   411
      sqlite3_free(new_elem);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   412
      return data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   413
    }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   414
  }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   415
  if( pH->count > pH->htsize ){
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   416
    rehash(pH,pH->htsize*2);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   417
  }
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   418
  assert( pH->htsize>0 );
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   419
  h = hraw % pH->htsize;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   420
  insertElement(pH, &pH->ht[h], new_elem);
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   421
  new_elem->data = data;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   422
  return 0;
08ec8eefde2f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   423
}