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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "m4/mem/mem.h"
#include "m4/mem/memman.h"
#include "m4/core/errors.h"
#include "m4/vars.h"
namespace M4 {
#define MAX_REQUESTS 255
void mem_stash_init(int16 num_types) {
if (num_types > _MEMTYPE_LIMIT)
error_show(FL, 'MSIF', "num_types (%d) _MEMTYPE_LIMIT (%d)", num_types, _MEMTYPE_LIMIT);
for (int i = 0; i < _MEMTYPE_LIMIT; i++) {
_G(memBlock)[i] = nullptr;
_G(sizeMem)[i] = 0;
_G(requests)[i] = 0;
}
}
void mem_stash_shutdown(void) {
for (int i = 0; i < _MEMTYPE_LIMIT; i++) {
if (_G(memBlock)[i]) {
mem_free(_G(memBlock)[i]);
_G(memBlock)[i] = nullptr;
}
}
}
bool mem_register_stash_type(int32 *memType, int32 blockSize, int32 maxNumRequests, const Common::String &name) {
int32 i = 0;
bool found = false;
while ((i < _MEMTYPE_LIMIT) && (_G(sizeMem)[i] > 0) && (!found)) {
i++;
}
if (i == _MEMTYPE_LIMIT)
error_show(FL, 'MSIF', "stash: %s", name.c_str());
// Found a slot
if (found || (i < _MEMTYPE_LIMIT)) {
_G(sizeMem)[i] = blockSize;
*memType = i;
if (maxNumRequests > MAX_REQUESTS)
maxNumRequests = MAX_REQUESTS;
_G(requests)[i] = maxNumRequests;
_G(memBlock)[i] = mem_alloc((blockSize + sizeof(uintptr)) * maxNumRequests, name.c_str());
memset(_G(memBlock)[i], 0, (blockSize + sizeof(uintptr)) * maxNumRequests);
return true;
}
error_show(FL, 'MSIF', "stash: %s", name.c_str());
return false;
}
void mem_free_to_stash(void *mem, int32 memType) {
// _G(memBlock)[memType] is block associated with memType
int8 *b_ptr = (int8 *)_G(memBlock)[memType];
int32 index = ((intptr)mem - (intptr)_G(memBlock)[memType]) / (_G(sizeMem)[memType] + sizeof(uintptr));
if (index < 0 || index > _G(requests)[memType])
error_show(FL, 'MSGF');
b_ptr += index * (_G(sizeMem)[memType] + sizeof(uintptr));
*(uintptr *)b_ptr = 0;
}
void *mem_get_from_stash(int32 memType, const Common::String &name) {
int i;
int8 *b_ptr = (int8 *)_G(memBlock)[memType];
for (i = 0; i < _G(requests)[memType]; i++) {
if (!*(uintptr *)b_ptr) {
*(uintptr *)b_ptr = 1;
void *result = (void *)(b_ptr + sizeof(uintptr));
Common::fill((byte *)result, (byte *)result + _G(sizeMem)[memType], 0);
return result;
} else {
b_ptr += _G(sizeMem)[memType] + sizeof(uintptr);
}
}
error_show(FL, 'OOS!', "stash full %s", name.c_str());
return 0;
}
char *mem_strdup(const char *str) {
char *new_str = nullptr;
if (!str) {
new_str = (char *)mem_alloc(1, "string");
new_str[0] = '\0';
return new_str;
}
new_str = (char *)mem_alloc(strlen(str) + 1, "string");
if (!new_str)
return nullptr;
Common::strcpy_s(new_str, 256, str);
return new_str;
}
} // namespace M4
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