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hashmap.cpp
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C/C++ Source or Header
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2002-02-03
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4KB
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154 lines
/////////////////////////////////////////////////////////////////////////////
// Name: hashmap.cpp
// Purpose: wxHashMap implementation
// Author: Mattia Barbon
// Modified by:
// Created: 29/01/2002
// RCS-ID: $Id: hashmap.cpp,v 1.3 2002/02/01 14:58:55 VZ Exp $
// Copyright: (c) Mattia Barbon
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "hashmap.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "wx/hashmap.h"
/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins */
/* from requirements by Colin Plumb. */
/* (http://burtleburtle.net/bob/hash/doobs.html) */
/* adapted from Perl sources ( hv.h ) */
unsigned long wxStringHash::wxCharStringHash( const wxChar* k )
{
unsigned long hash = 0;
while( *k )
{
hash += *k++;
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
return hash + (hash << 15);
}
#if wxUSE_UNICODE
unsigned long wxStringHash::charStringHash( const char* k )
{
unsigned long hash = 0;
while( *k )
{
hash += *k++;
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
return hash + (hash << 15);
}
#endif
/* from SGI STL */
const unsigned long _wxHashTableBase2::ms_primes[prime_count] =
{
7ul, 13ul, 29ul,
53ul, 97ul, 193ul, 389ul, 769ul,
1543ul, 3079ul, 6151ul, 12289ul, 24593ul,
49157ul, 98317ul, 196613ul, 393241ul, 786433ul,
1572869ul, 3145739ul, 6291469ul, 12582917ul, 25165843ul,
50331653ul, 100663319ul, 201326611ul, 402653189ul, 805306457ul,
1610612741ul, 3221225473ul, 4294967291ul
};
unsigned long _wxHashTableBase2::GetNextPrime( unsigned long n )
{
const unsigned long* ptr = &ms_primes[0];
for( size_t i = 0; i < prime_count; ++i, ++ptr )
{
if( n < *ptr )
return *ptr;
}
/* someone might try to alloc a 2^32-element hash table */
wxFAIL_MSG( _T("hash table too big?") );
/* quiet warning */
return 0;
}
unsigned long _wxHashTableBase2::GetPreviousPrime( unsigned long n )
{
const unsigned long* ptr = &ms_primes[prime_count - 1];
for( size_t i = 0; i < prime_count; ++i, --ptr )
{
if( n > *ptr )
return *ptr;
}
/* quiet warning */
return 1;
}
void _wxHashTableBase2::DeleteNodes( size_t buckets,
_wxHashTable_NodeBase** table,
NodeDtor dtor )
{
size_t i;
for( i = 0; i < buckets; ++i )
{
_wxHashTable_NodeBase* node = table[i];
_wxHashTable_NodeBase* tmp;
while( node )
{
tmp = node->m_nxt;
dtor( node );
node = tmp;
}
}
memset( table, 0, buckets * sizeof(void*) );
}
void _wxHashTableBase2::CopyHashTable( _wxHashTable_NodeBase** srcTable,
size_t srcBuckets,
_wxHashTableBase2* dst,
_wxHashTable_NodeBase** dstTable,
BucketFromNode func, ProcessNode proc )
{
for( size_t i = 0; i < srcBuckets; ++i )
{
_wxHashTable_NodeBase* nextnode;
for( _wxHashTable_NodeBase* node = srcTable[i]; node; node = nextnode )
{
size_t bucket = func( dst, node );
nextnode = node->m_nxt;
_wxHashTable_NodeBase* newnode = proc( node );
newnode->m_nxt = dstTable[bucket];
dstTable[bucket] = newnode;
}
}
}
_wxHashTable_NodeBase* _wxHashTableBase2::DummyProcessNode(_wxHashTable_NodeBase* node)
{
return node;
}