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// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
//
// This file is part of GNU C++ uCommon.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include <config.h>
#include <ucommon/export.h>
#include <ucommon/bitmap.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
using namespace UCOMMON_NAMESPACE;
bitmap::bitmap(size_t count)
{
size_t mem = count / 8;
size = count;
bus = BMALLOC;
if(count % 8)
++mem;
addr.a = ::malloc(mem);
clear();
}
bitmap::bitmap(void *ptr, size_t count, bus_t access)
{
assert(ptr != NULL);
assert(access >= BMIN && access <= BMAX);
addr.a = ptr;
bus = access;
}
bitmap::~bitmap()
{
if(bus == BMALLOC && addr.b)
::free(addr.b);
addr.b = NULL;
}
unsigned bitmap::memsize(void) const
{
switch(bus) {
case B64:
return 64;
case B32:
return 32;
case B16:
return 16;
default:
return 8;
}
}
void bitmap::set(size_t offset, bool bit)
{
unsigned bs = memsize();
size_t pos = offset / bs;
unsigned rem = offset % bs;
uint64_t b64;
uint32_t b32;
uint16_t b16;
uint8_t b8;
if(offset >= size)
return;
switch(bus) {
case B64:
b64 = ((uint64_t)(1))<<rem;
if(bit)
addr.d[pos] |= b64;
else
addr.d[pos] &= ~b64;
break;
case B32:
b32 = 1<<rem;
if(bit)
addr.l[pos] |= b32;
else
addr.l[pos] &= ~b32;
break;
case B16:
b16 = 1<<rem;
if(bit)
addr.w[pos] |= b16;
else
addr.w[pos] &= ~b16;
break;
default:
b8 = 1<<rem;
if(bit)
addr.b[pos] |= b8;
else
addr.b[pos] &= ~b8;
break;
}
}
bool bitmap::get(size_t offset) const
{
unsigned bs = memsize();
size_t pos = offset / bs;
unsigned rem = offset % bs;
if(offset >= size)
return false;
switch(bus) {
#if !defined(_MSC_VER) || _MSC_VER >= 1400
case B64:
return (addr.d[pos] & 1ll<<rem) > 0;
#endif
case B32:
return (addr.l[pos] & 1l<<rem) > 0;
case B16:
return (addr.w[pos] & 1<<rem) > 0;
default:
return (addr.b[pos] & 1<<rem) > 0;
}
}
void bitmap::clear(void)
{
unsigned bs = memsize();
if(size % bs)
++size;
while(size--) {
switch(bus) {
#if !defined(_MSC_VER) || _MSC_VER >= 1400
case B64:
*(addr.d++) = 0ll;
break;
#endif
case B32:
*(addr.l++) = 0l;
break;
case B16:
*(addr.w++) = 0;
break;
default:
*(addr.b++) = 0;
}
}
}
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