--- a/engine/sqlite/src/hash.cpp	Wed Apr 28 13:20:05 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,418 +0,0 @@
-/*
-** 2001 September 22
-**
-** 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 is the implementation of generic hash-tables
-** used in SQLite.
-**
-** $Id: hash.cpp 1282 2008-11-13 09:31:33Z LarsPson $
-*/
-#include "sqliteInt.h"
-#include <assert.h>
-
-/* Turn bulk memory into a hash table object by initializing the
-** fields of the Hash structure.
-**
-** "pNew" is a pointer to the hash table that is to be initialized.
-** keyClass is one of the constants SQLITE_HASH_INT, SQLITE_HASH_POINTER,
-** SQLITE_HASH_BINARY, or SQLITE_HASH_STRING.  The value of keyClass 
-** determines what kind of key the hash table will use.  "copyKey" is
-** true if the hash table should make its own private copy of keys and
-** false if it should just use the supplied pointer.  CopyKey only makes
-** sense for SQLITE_HASH_STRING and SQLITE_HASH_BINARY and is ignored
-** for other key classes.
-*/
-void sqlite3HashInit(Hash *pNew, int keyClass, int copyKey){
-  assert( pNew!=0 );
-  assert( keyClass>=SQLITE_HASH_STRING && keyClass<=SQLITE_HASH_BINARY );
-  pNew->keyClass = keyClass;
-#if 0
-  if( keyClass==SQLITE_HASH_POINTER || keyClass==SQLITE_HASH_INT ) copyKey = 0;
-#endif
-  pNew->copyKey = copyKey;
-  pNew->first = 0;
-  pNew->count = 0;
-  pNew->htsize = 0;
-  pNew->ht = 0;
-}
-
-/* Remove all entries from a hash table.  Reclaim all memory.
-** Call this routine to delete a hash table or to reset a hash table
-** to the empty state.
-*/
-void sqlite3HashClear(Hash *pH){
-  HashElem *elem;         /* For looping over all elements of the table */
-
-  assert( pH!=0 );
-  elem = pH->first;
-  pH->first = 0;
-  if( pH->ht ) sqlite3_free(pH->ht);
-  pH->ht = 0;
-  pH->htsize = 0;
-  while( elem ){
-    HashElem *next_elem = elem->next;
-    if( pH->copyKey && elem->pKey ){
-      sqlite3_free(elem->pKey);
-    }
-    sqlite3_free(elem);
-    elem = next_elem;
-  }
-  pH->count = 0;
-}
-
-#if 0 /* NOT USED */
-/*
-** Hash and comparison functions when the mode is SQLITE_HASH_INT
-*/
-static int intHash(const void *pKey, int nKey){
-  return nKey ^ (nKey<<8) ^ (nKey>>8);
-}
-static int intCompare(const void *pKey1, int n1, const void *pKey2, int n2){
-  return n2 - n1;
-}
-#endif
-
-#if 0 /* NOT USED */
-/*
-** Hash and comparison functions when the mode is SQLITE_HASH_POINTER
-*/
-static int ptrHash(const void *pKey, int nKey){
-  uptr x = Addr(pKey);
-  return x ^ (x<<8) ^ (x>>8);
-}
-static int ptrCompare(const void *pKey1, int n1, const void *pKey2, int n2){
-  if( pKey1==pKey2 ) return 0;
-  if( pKey1<pKey2 ) return -1;
-  return 1;
-}
-#endif
-
-/*
-** Hash and comparison functions when the mode is SQLITE_HASH_STRING
-*/
-static int strHash(const void *pKey, int nKey){
-  const char *z = (const char *)pKey;
-  int h = 0;
-  if( nKey<=0 ) nKey = strlen(z);
-  while( nKey > 0  ){
-    h = (h<<3) ^ h ^ sqlite3UpperToLower[(unsigned char)*z++];
-    nKey--;
-  }
-  return h & 0x7fffffff;
-}
-static int strCompare(const void *pKey1, int n1, const void *pKey2, int n2){
-  if( n1!=n2 ) return 1;
-  return sqlite3StrNICmp((const char*)pKey1,(const char*)pKey2,n1);
-}
-
-/*
-** Hash and comparison functions when the mode is SQLITE_HASH_BINARY
-*/
-static int binHash(const void *pKey, int nKey){
-  int h = 0;
-  const char *z = (const char *)pKey;
-  while( nKey-- > 0 ){
-    h = (h<<3) ^ h ^ *(z++);
-  }
-  return h & 0x7fffffff;
-}
-static int binCompare(const void *pKey1, int n1, const void *pKey2, int n2){
-  if( n1!=n2 ) return 1;
-  return memcmp(pKey1,pKey2,n1);
-}
-
-/*
-** Return a pointer to the appropriate hash function given the key class.
-**
-** The C syntax in this function definition may be unfamilar to some 
-** programmers, so we provide the following additional explanation:
-**
-** The name of the function is "hashFunction".  The function takes a
-** single parameter "keyClass".  The return value of hashFunction()
-** is a pointer to another function.  Specifically, the return value
-** of hashFunction() is a pointer to a function that takes two parameters
-** with types "const void*" and "int" and returns an "int".
-*/
-static int (*hashFunction(int keyClass))(const void*,int){
-#if 0  /* HASH_INT and HASH_POINTER are never used */
-  switch( keyClass ){
-    case SQLITE_HASH_INT:     return &intHash;
-    case SQLITE_HASH_POINTER: return &ptrHash;
-    case SQLITE_HASH_STRING:  return &strHash;
-    case SQLITE_HASH_BINARY:  return &binHash;;
-    default: break;
-  }
-  return 0;
-#else
-  if( keyClass==SQLITE_HASH_STRING ){
-    return &strHash;
-  }else{
-    assert( keyClass==SQLITE_HASH_BINARY );
-    return &binHash;
-  }
-#endif
-}
-
-/*
-** Return a pointer to the appropriate hash function given the key class.
-**
-** For help in interpreted the obscure C code in the function definition,
-** see the header comment on the previous function.
-*/
-static int (*compareFunction(int keyClass))(const void*,int,const void*,int){
-#if 0 /* HASH_INT and HASH_POINTER are never used */
-  switch( keyClass ){
-    case SQLITE_HASH_INT:     return &intCompare;
-    case SQLITE_HASH_POINTER: return &ptrCompare;
-    case SQLITE_HASH_STRING:  return &strCompare;
-    case SQLITE_HASH_BINARY:  return &binCompare;
-    default: break;
-  }
-  return 0;
-#else
-  if( keyClass==SQLITE_HASH_STRING ){
-    return &strCompare;
-  }else{
-    assert( keyClass==SQLITE_HASH_BINARY );
-    return &binCompare;
-  }
-#endif
-}
-
-/* Link an element into the hash table
-*/
-static void insertElement(
-  Hash *pH,              /* The complete hash table */
-  Hash::_ht *pEntry,    /* The entry into which pNew is inserted */
-  HashElem *pNew         /* The element to be inserted */
-){
-  HashElem *pHead;       /* First element already in pEntry */
-  pHead = pEntry->chain;
-  if( pHead ){
-    pNew->next = pHead;
-    pNew->prev = pHead->prev;
-    if( pHead->prev ){ pHead->prev->next = pNew; }
-    else             { pH->first = pNew; }
-    pHead->prev = pNew;
-  }else{
-    pNew->next = pH->first;
-    if( pH->first ){ pH->first->prev = pNew; }
-    pNew->prev = 0;
-    pH->first = pNew;
-  }
-  pEntry->count++;
-  pEntry->chain = pNew;
-}
-
-
-/* Resize the hash table so that it cantains "new_size" buckets.
-** "new_size" must be a power of 2.  The hash table might fail 
-** to resize if sqlite3_malloc() fails.
-*/
-static void rehash(Hash *pH, int new_size){
-  Hash::_ht *new_ht;            /* The new hash table */
-  HashElem *elem, *next_elem;    /* For looping over existing elements */
-  int (*xHash)(const void*,int); /* The hash function */
-
-  assert( (new_size & (new_size-1))==0 );
-
-  /* There is a call to sqlite3_malloc() inside rehash(). If there is
-  ** already an allocation at pH->ht, then if this malloc() fails it
-  ** is benign (since failing to resize a hash table is a performance
-  ** hit only, not a fatal error).
-  */
-  sqlite3MallocBenignFailure(pH->htsize>0);
-
-  new_ht = (Hash::_ht *)sqlite3MallocZero( new_size*sizeof(Hash::_ht) );
-  if( new_ht==0 ) return;
-  if( pH->ht ) sqlite3_free(pH->ht);
-  pH->ht = new_ht;
-  pH->htsize = new_size;
-  xHash = hashFunction(pH->keyClass);
-  for(elem=pH->first, pH->first=0; elem; elem = next_elem){
-    int h = (*xHash)(elem->pKey, elem->nKey) & (new_size-1);
-    next_elem = elem->next;
-    insertElement(pH, &new_ht[h], elem);
-  }
-}
-
-/* This function (for internal use only) locates an element in an
-** hash table that matches the given key.  The hash for this key has
-** already been computed and is passed as the 4th parameter.
-*/
-static HashElem *findElementGivenHash(
-  const Hash *pH,     /* The pH to be searched */
-  const void *pKey,   /* The key we are searching for */
-  int nKey,
-  int h               /* The hash for this key. */
-){
-  HashElem *elem;                /* Used to loop thru the element list */
-  int count;                     /* Number of elements left to test */
-  int (*xCompare)(const void*,int,const void*,int);  /* comparison function */
-
-  if( pH->ht ){
-	  Hash::_ht *pEntry = &pH->ht[h];
-    elem = pEntry->chain;
-    count = pEntry->count;
-    xCompare = compareFunction(pH->keyClass);
-    while( count-- && elem ){
-      if( (*xCompare)(elem->pKey,elem->nKey,pKey,nKey)==0 ){ 
-        return elem;
-      }
-      elem = elem->next;
-    }
-  }
-  return 0;
-}
-
-/* Remove a single entry from the hash table given a pointer to that
-** element and a hash on the element's key.
-*/
-static void removeElementGivenHash(
-  Hash *pH,         /* The pH containing "elem" */
-  HashElem* elem,   /* The element to be removed from the pH */
-  int h             /* Hash value for the element */
-){
-	Hash::_ht *pEntry;
-  if( elem->prev ){
-    elem->prev->next = elem->next; 
-  }else{
-    pH->first = elem->next;
-  }
-  if( elem->next ){
-    elem->next->prev = elem->prev;
-  }
-  pEntry = &pH->ht[h];
-  if( pEntry->chain==elem ){
-    pEntry->chain = elem->next;
-  }
-  pEntry->count--;
-  if( pEntry->count<=0 ){
-    pEntry->chain = 0;
-  }
-  if( pH->copyKey ){
-    sqlite3_free(elem->pKey);
-  }
-  sqlite3_free( elem );
-  pH->count--;
-  if( pH->count<=0 ){
-    assert( pH->first==0 );
-    assert( pH->count==0 );
-    sqlite3HashClear(pH);
-  }
-}
-
-/* Attempt to locate an element of the hash table pH with a key
-** that matches pKey,nKey.  Return a pointer to the corresponding 
-** HashElem structure for this element if it is found, or NULL
-** otherwise.
-*/
-HashElem *sqlite3HashFindElem(const Hash *pH, const void *pKey, int nKey){
-  int h;             /* A hash on key */
-  HashElem *elem;    /* The element that matches key */
-  int (*xHash)(const void*,int);  /* The hash function */
-
-  if( pH==0 || pH->ht==0 ) return 0;
-  xHash = hashFunction(pH->keyClass);
-  assert( xHash!=0 );
-  h = (*xHash)(pKey,nKey);
-  assert( (pH->htsize & (pH->htsize-1))==0 );
-  elem = findElementGivenHash(pH,pKey,nKey, h & (pH->htsize-1));
-  return elem;
-}
-
-/* Attempt to locate an element of the hash table pH with a key
-** that matches pKey,nKey.  Return the data for this element if it is
-** found, or NULL if there is no match.
-*/
-void *sqlite3HashFind(const Hash *pH, const void *pKey, int nKey){
-  HashElem *elem;    /* The element that matches key */
-  elem = sqlite3HashFindElem(pH, pKey, nKey);
-  return elem ? elem->data : 0;
-}
-
-/* Insert an element into the hash table pH.  The key is pKey,nKey
-** and the data is "data".
-**
-** If no element exists with a matching key, then a new
-** element is created.  A copy of the key is made if the copyKey
-** flag is set.  NULL is returned.
-**
-** If another element already exists with the same key, then the
-** new data replaces the old data and the old data is returned.
-** The key is not copied in this instance.  If a malloc fails, then
-** the new data is returned and the hash table is unchanged.
-**
-** If the "data" parameter to this function is NULL, then the
-** element corresponding to "key" is removed from the hash table.
-*/
-void *sqlite3HashInsert(Hash *pH, const void *pKey, int nKey, void *data){
-  int hraw;             /* Raw hash value of the key */
-  int h;                /* the hash of the key modulo hash table size */
-  HashElem *elem;       /* Used to loop thru the element list */
-  HashElem *new_elem;   /* New element added to the pH */
-  int (*xHash)(const void*,int);  /* The hash function */
-
-  assert( pH!=0 );
-  xHash = hashFunction(pH->keyClass);
-  assert( xHash!=0 );
-  hraw = (*xHash)(pKey, nKey);
-  assert( (pH->htsize & (pH->htsize-1))==0 );
-  h = hraw & (pH->htsize-1);
-  elem = findElementGivenHash(pH,pKey,nKey,h);
-  if( elem ){
-    void *old_data = elem->data;
-    if( data==0 ){
-      removeElementGivenHash(pH,elem,h);
-    }else{
-      elem->data = data;
-      if( !pH->copyKey ){
-        elem->pKey = (void *)pKey;
-      }
-      assert(nKey==elem->nKey);
-    }
-    return old_data;
-  }
-  if( data==0 ) return 0;
-  new_elem = (HashElem*)sqlite3_malloc( sizeof(HashElem) );
-  if( new_elem==0 ) return data;
-  if( pH->copyKey && pKey!=0 ){
-    new_elem->pKey = sqlite3_malloc( nKey );
-    if( new_elem->pKey==0 ){
-      sqlite3_free(new_elem);
-      return data;
-    }
-    memcpy((void*)new_elem->pKey, pKey, nKey);
-  }else{
-    new_elem->pKey = (void*)pKey;
-  }
-  new_elem->nKey = nKey;
-  pH->count++;
-  if( pH->htsize==0 ){
-    rehash(pH,8);
-    if( pH->htsize==0 ){
-      pH->count = 0;
-      if( pH->copyKey ){
-        sqlite3_free(new_elem->pKey);
-      }
-      sqlite3_free(new_elem);
-      return data;
-    }
-  }
-  if( pH->count > pH->htsize ){
-    rehash(pH,pH->htsize*2);
-  }
-  assert( pH->htsize>0 );
-  assert( (pH->htsize & (pH->htsize-1))==0 );
-  h = hraw & (pH->htsize-1);
-  insertElement(pH, &pH->ht[h], new_elem);
-  new_elem->data = data;
-  return 0;
-}