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RetroArch/cheevos/var.c
twinaphex ac14ea6d01 Go back to old cheevos
2018-10-01 15:02:51 +02:00

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2015-2017 - Andre Leiradella
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <stdint.h>
#include <libretro.h>
#include "var.h"
#include "../retroarch.h"
#include "../core.h"
#include "../verbosity.h"
/*****************************************************************************
Parsing
*****************************************************************************/
static cheevos_var_size_t cheevos_var_parse_prefix(const char** memaddr)
{
/* Careful not to use ABCDEF here, this denotes part of an actual variable! */
const char* str = *memaddr;
cheevos_var_size_t size;
switch (toupper((unsigned char)*str++))
{
case 'M':
size = CHEEVOS_VAR_SIZE_BIT_0;
break;
case 'N':
size = CHEEVOS_VAR_SIZE_BIT_1;
break;
case 'O':
size = CHEEVOS_VAR_SIZE_BIT_2;
break;
case 'P':
size = CHEEVOS_VAR_SIZE_BIT_3;
break;
case 'Q':
size = CHEEVOS_VAR_SIZE_BIT_4;
break;
case 'R':
size = CHEEVOS_VAR_SIZE_BIT_5;
break;
case 'S':
size = CHEEVOS_VAR_SIZE_BIT_6;
break;
case 'T':
size = CHEEVOS_VAR_SIZE_BIT_7;
break;
case 'L':
size = CHEEVOS_VAR_SIZE_NIBBLE_LOWER;
break;
case 'U':
size = CHEEVOS_VAR_SIZE_NIBBLE_UPPER;
break;
case 'H':
size = CHEEVOS_VAR_SIZE_EIGHT_BITS;
break;
case 'X':
size = CHEEVOS_VAR_SIZE_THIRTYTWO_BITS;
break;
default:
str--;
/* fall through */
case ' ':
size = CHEEVOS_VAR_SIZE_SIXTEEN_BITS;
break;
}
*memaddr = str;
return size;
}
static size_t cheevos_var_reduce(size_t addr, size_t mask)
{
while (mask)
{
size_t tmp = (mask - 1) & ~mask;
addr = (addr & tmp) | ((addr >> 1) & ~tmp);
mask = (mask & (mask - 1)) >> 1;
}
return addr;
}
static size_t cheevos_var_highest_bit(size_t n)
{
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
n |= n >> 16;
return n ^ (n >> 1);
}
void cheevos_var_parse(cheevos_var_t* var, const char** memaddr)
{
char *end = NULL;
const char *str = *memaddr;
unsigned base = 16;
var->is_bcd = false;
if (toupper((unsigned char)*str) == 'D' && str[1] == '0' && toupper((unsigned char)str[2]) == 'X')
{
/* d0x + 4 hex digits */
str += 3;
var->type = CHEEVOS_VAR_TYPE_DELTA_MEM;
}
else if (toupper((unsigned char)*str) == 'B' && str[1] == '0' && toupper((unsigned char)str[2]) == 'X')
{
/* b0x (binary-coded decimal) */
str += 3;
var->is_bcd = true;
var->type = CHEEVOS_VAR_TYPE_ADDRESS;
}
else if (*str == '0' && toupper((unsigned char)str[1]) == 'X')
{
/* 0x + 4 hex digits */
str += 2;
var->type = CHEEVOS_VAR_TYPE_ADDRESS;
}
else
{
var->type = CHEEVOS_VAR_TYPE_VALUE_COMP;
if (toupper((unsigned char)*str) == 'H')
str++;
else
{
if (toupper((unsigned char)*str) == 'V')
str++;
base = 10;
}
}
if (var->type != CHEEVOS_VAR_TYPE_VALUE_COMP)
{
var->size = cheevos_var_parse_prefix(&str);
}
var->value = (unsigned)strtol(str, &end, base);
*memaddr = end;
}
void cheevos_var_patch_addr(cheevos_var_t* var, cheevos_console_t console)
{
rarch_system_info_t *system = runloop_get_system_info();
var->bank_id = -1;
if (console == CHEEVOS_CONSOLE_NINTENDO)
{
if (var->value >= 0x0800 && var->value < 0x2000)
{
CHEEVOS_LOG(CHEEVOS_TAG "NES memory address in mirrorred RAM %X, adjusted to %X\n", var->value, var->value & 0x07ff);
var->value &= 0x07ff;
}
}
else if (console == CHEEVOS_CONSOLE_GAMEBOY_COLOR)
{
if (var->value >= 0xe000 && var->value <= 0xfdff)
{
CHEEVOS_LOG(CHEEVOS_TAG "GBC memory address in echo RAM %X, adjusted to %X\n", var->value, var->value - 0x2000);
var->value -= 0x2000;
}
}
if (system->mmaps.num_descriptors != 0)
{
const rarch_memory_descriptor_t *desc = NULL;
const rarch_memory_descriptor_t *end = NULL;
/* Patch the address to correctly map it to the mmaps */
if (console == CHEEVOS_CONSOLE_GAMEBOY_ADVANCE)
{
if (var->value < 0x8000) /* Internal RAM */
{
CHEEVOS_LOG(CHEEVOS_TAG "GBA memory address %X adjusted to %X\n", var->value, var->value + 0x3000000);
var->value += 0x3000000;
}
else /* Work RAM */
{
CHEEVOS_LOG(CHEEVOS_TAG "GBA memory address %X adjusted to %X\n", var->value, var->value + 0x2000000 - 0x8000);
var->value += 0x2000000 - 0x8000;
}
}
else if (console == CHEEVOS_CONSOLE_PC_ENGINE)
{
CHEEVOS_LOG(CHEEVOS_TAG "PCE memory address %X adjusted to %X\n", var->value, var->value + 0x1f0000);
var->value += 0x1f0000;
}
else if (console == CHEEVOS_CONSOLE_SUPER_NINTENDO)
{
if (var->value < 0x020000) /* Work RAM */
{
CHEEVOS_LOG(CHEEVOS_TAG "SNES memory address %X adjusted to %X\n", var->value, var->value + 0x7e0000);
var->value += 0x7e0000;
}
else /* Save RAM */
{
CHEEVOS_LOG(CHEEVOS_TAG "SNES memory address %X adjusted to %X\n", var->value, var->value + 0x006000 - 0x020000);
var->value += 0x006000 - 0x020000;
}
}
desc = system->mmaps.descriptors;
end = desc + system->mmaps.num_descriptors;
for (; desc < end; desc++)
{
if (((desc->core.start ^ var->value) & desc->core.select) == 0)
{
unsigned addr = var->value;
var->bank_id = (int)(desc - system->mmaps.descriptors);
var->value = (unsigned)cheevos_var_reduce(
(addr - desc->core.start) & desc->disconnect_mask,
desc->core.disconnect);
if (var->value >= desc->core.len)
var->value -= cheevos_var_highest_bit(var->value);
var->value += desc->core.offset;
CHEEVOS_LOG(CHEEVOS_TAG "address %X set to descriptor %d at offset %X\n", addr, var->bank_id + 1, var->value);
break;
}
}
}
else
{
unsigned i;
for (i = 0; i < 4; i++)
{
retro_ctx_memory_info_t meminfo;
switch (i)
{
case 0:
meminfo.id = RETRO_MEMORY_SYSTEM_RAM;
break;
case 1:
meminfo.id = RETRO_MEMORY_SAVE_RAM;
break;
case 2:
meminfo.id = RETRO_MEMORY_VIDEO_RAM;
break;
case 3:
meminfo.id = RETRO_MEMORY_RTC;
break;
}
core_get_memory(&meminfo);
if (var->value < meminfo.size)
{
var->bank_id = i;
break;
}
/* HACK subtract the correct amount of bytes to reach the save RAM */
if (i == 0 && console == CHEEVOS_CONSOLE_NINTENDO)
var->value -= 0x6000;
else
var->value -= meminfo.size;
}
}
}
/*****************************************************************************
Testing
*****************************************************************************/
uint8_t* cheevos_var_get_memory(const cheevos_var_t* var)
{
uint8_t* memory = NULL;
if (var->bank_id >= 0)
{
rarch_system_info_t* system = runloop_get_system_info();
if (system->mmaps.num_descriptors != 0)
memory = (uint8_t*)system->mmaps.descriptors[var->bank_id].core.ptr;
else
{
retro_ctx_memory_info_t meminfo = {NULL, 0, 0};
switch (var->bank_id)
{
case 0:
meminfo.id = RETRO_MEMORY_SYSTEM_RAM;
break;
case 1:
meminfo.id = RETRO_MEMORY_SAVE_RAM;
break;
case 2:
meminfo.id = RETRO_MEMORY_VIDEO_RAM;
break;
case 3:
meminfo.id = RETRO_MEMORY_RTC;
break;
default:
CHEEVOS_ERR(CHEEVOS_TAG "invalid bank id: %s\n", var->bank_id);
break;
}
core_get_memory(&meminfo);
memory = (uint8_t*)meminfo.data;
}
if (memory)
memory += var->value;
}
return memory;
}
unsigned cheevos_var_get_value(cheevos_var_t* var)
{
const uint8_t* memory = NULL;
unsigned value = 0;
switch (var->type)
{
case CHEEVOS_VAR_TYPE_VALUE_COMP:
value = var->value;
break;
case CHEEVOS_VAR_TYPE_ADDRESS:
case CHEEVOS_VAR_TYPE_DELTA_MEM:
memory = cheevos_var_get_memory(var);
if (memory)
{
value = memory[0];
switch (var->size)
{
case CHEEVOS_VAR_SIZE_BIT_0:
value &= 1;
break;
case CHEEVOS_VAR_SIZE_BIT_1:
value = (value >> 1) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_2:
value = (value >> 2) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_3:
value = (value >> 3) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_4:
value = (value >> 4) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_5:
value = (value >> 5) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_6:
value = (value >> 6) & 1;
break;
case CHEEVOS_VAR_SIZE_BIT_7:
value = (value >> 7) & 1;
break;
case CHEEVOS_VAR_SIZE_NIBBLE_LOWER:
value &= 0x0f;
break;
case CHEEVOS_VAR_SIZE_NIBBLE_UPPER:
value = (value >> 4) & 0x0f;
break;
case CHEEVOS_VAR_SIZE_EIGHT_BITS:
break;
case CHEEVOS_VAR_SIZE_SIXTEEN_BITS:
value |= memory[1] << 8;
break;
case CHEEVOS_VAR_SIZE_THIRTYTWO_BITS:
value |= memory[1] << 8;
value |= memory[2] << 16;
value |= memory[3] << 24;
break;
}
}
if (var->type == CHEEVOS_VAR_TYPE_DELTA_MEM)
{
unsigned previous = var->previous;
var->previous = value;
value = previous;
}
break;
case CHEEVOS_VAR_TYPE_DYNAMIC_VAR:
/* We shouldn't get here... */
break;
}
if(var->is_bcd)
return (((value >> 4) & 0xf) * 10) + (value & 0xf);
return value;
}
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