460 lines
10 KiB
C
460 lines
10 KiB
C
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/* Cheat Support for PCSX-Reloaded
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*
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* Copyright (c) 2009, Wei Mingzhi <whistler@openoffice.org>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02111-1307 USA
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*/
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#include "psxcommon.h"
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#include "r3000a.h"
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#include "psxmem.h"
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#include "cheat.h"
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Cheat *Cheats = NULL;
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int NumCheats = 0;
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static int NumCheatsAllocated = 0;
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CheatCode *CheatCodes = NULL;
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int NumCodes = 0;
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static int NumCodesAllocated = 0;
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#define ALLOC_INCREMENT 100
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// cheat types
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#define CHEAT_CONST8 0x30 /* 8-bit Constant Write */
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#define CHEAT_CONST16 0x80 /* 16-bit Constant Write */
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#define CHEAT_INC16 0x10 /* 16-bit Increment */
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#define CHEAT_DEC16 0x11 /* 16-bit Decrement */
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#define CHEAT_INC8 0x20 /* 8-bit Increment */
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#define CHEAT_DEC8 0x21 /* 8-bit Decrement */
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#define CHEAT_SLIDE 0x50 /* Slide Codes */
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#define CHEAT_MEMCPY 0xC2 /* Memory Copy */
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#define CHEAT_EQU8 0xE0 /* 8-bit Equal To */
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#define CHEAT_NOTEQU8 0xE1 /* 8-bit Not Equal To */
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#define CHEAT_LESSTHAN8 0xE2 /* 8-bit Less Than */
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#define CHEAT_GREATERTHAN8 0xE3 /* 8-bit Greater Than */
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#define CHEAT_EQU16 0xD0 /* 16-bit Equal To */
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#define CHEAT_NOTEQU16 0xD1 /* 16-bit Not Equal To */
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#define CHEAT_LESSTHAN16 0xD2 /* 16-bit Less Than */
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#define CHEAT_GREATERTHAN16 0xD3 /* 16-bit Greater Than */
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void ClearAllCheats() {
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int i;
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if (Cheats != NULL) {
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for (i = 0; i < NumCheats; i++) {
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free(Cheats[i].Descr);
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}
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free(Cheats);
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}
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Cheats = NULL;
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NumCheats = 0;
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NumCheatsAllocated = 0;
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if (CheatCodes != NULL) {
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free(CheatCodes);
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}
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CheatCodes = NULL;
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NumCodes = 0;
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NumCodesAllocated = 0;
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}
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// load cheats from the specific filename
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void LoadCheats(const char *filename) {
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FILE *fp;
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char buf[256];
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int count = 0;
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unsigned int t1, t2;
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fp = fopen(filename, "r");
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if (fp == NULL) {
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return;
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}
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ClearAllCheats();
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while (fgets(buf, 255, fp) != NULL) {
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buf[255] = '\0';
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trim(buf);
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// Skip comment or blank lines
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if (buf[0] == '#' || buf[0] == ';' || buf[0] == '/' || buf[0] == '\"' || buf[0] == '\0')
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continue;
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if (buf[0] == '[' && buf[strlen(buf) - 1] == ']') {
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if (NumCheats > 0)
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Cheats[NumCheats - 1].n = count;
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if (NumCheats >= NumCheatsAllocated) {
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NumCheatsAllocated += ALLOC_INCREMENT;
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if (Cheats == NULL) {
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assert(NumCheats == 0);
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assert(NumCheatsAllocated == ALLOC_INCREMENT);
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Cheats = (Cheat *)malloc(sizeof(Cheat) * NumCheatsAllocated);
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} else {
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Cheats = (Cheat *)realloc(Cheats, sizeof(Cheat) * NumCheatsAllocated);
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}
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}
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buf[strlen(buf) - 1] = '\0';
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count = 0;
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if (buf[1] == '*') {
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Cheats[NumCheats].Descr = strdup(buf + 2);
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Cheats[NumCheats].Enabled = 1;
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} else {
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Cheats[NumCheats].Descr = strdup(buf + 1);
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Cheats[NumCheats].Enabled = 0;
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}
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Cheats[NumCheats].First = NumCodes;
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NumCheats++;
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continue;
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}
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if (NumCheats <= 0)
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continue;
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if (NumCodes >= NumCodesAllocated) {
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NumCodesAllocated += ALLOC_INCREMENT;
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if (CheatCodes == NULL) {
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assert(NumCodes == 0);
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assert(NumCodesAllocated == ALLOC_INCREMENT);
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CheatCodes = (CheatCode *)malloc(sizeof(CheatCode) * NumCodesAllocated);
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} else {
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CheatCodes = (CheatCode *)realloc(CheatCodes, sizeof(CheatCode) * NumCodesAllocated);
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}
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}
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sscanf(buf, "%x %x", &t1, &t2);
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CheatCodes[NumCodes].Addr = t1;
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CheatCodes[NumCodes].Val = t2;
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NumCodes++;
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count++;
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}
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if (NumCheats > 0)
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Cheats[NumCheats - 1].n = count;
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fclose(fp);
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SysPrintf("Cheats loaded from: %s\n", filename);
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}
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// save all cheats to the specified filename
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void SaveCheats(const char *filename) {
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FILE *fp;
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int i, j;
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fp = fopen(filename, "w");
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if (fp == NULL) {
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return;
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}
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for (i = 0; i < NumCheats; i++) {
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// write the description
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if (Cheats[i].Enabled)
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fprintf(fp, "[*%s]\n", Cheats[i].Descr);
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else
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fprintf(fp, "[%s]\n", Cheats[i].Descr);
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// write all cheat codes
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for (j = 0; j < Cheats[i].n; j++) {
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fprintf(fp, "%.8X %.4X\n",
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CheatCodes[Cheats[i].First + j].Addr,
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CheatCodes[Cheats[i].First + j].Val);
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}
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fprintf(fp, "\n");
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}
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fclose(fp);
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SysPrintf("Cheats saved to: %s\n", filename);
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}
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// apply all enabled cheats
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void ApplyCheats() {
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int i, j, k, endindex;
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for (i = 0; i < NumCheats; i++) {
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if (!Cheats[i].Enabled) {
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continue;
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}
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// process all cheat codes
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endindex = Cheats[i].First + Cheats[i].n;
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for (j = Cheats[i].First; j < endindex; j++) {
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u8 type = (uint8_t)(CheatCodes[j].Addr >> 24);
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u32 addr = (CheatCodes[j].Addr & 0x001FFFFF);
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u16 val = CheatCodes[j].Val;
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u32 taddr;
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switch (type) {
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case CHEAT_CONST8:
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psxMemWrite8(addr, (u8)val);
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break;
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case CHEAT_CONST16:
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psxMemWrite16(addr, (u16)val);
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break;
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case CHEAT_INC16:
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psxMemWrite16(addr, psxMemRead16(addr) + val);
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break;
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case CHEAT_DEC16:
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psxMemWrite16(addr, psxMemRead16(addr) - val);
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break;
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case CHEAT_INC8:
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psxMemWrite8(addr, psxMemRead8(addr) + (u8)val);
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break;
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case CHEAT_DEC8:
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psxMemWrite8(addr, psxMemRead8(addr) - (u8)val);
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break;
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case CHEAT_SLIDE:
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j++;
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if (j >= endindex)
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break;
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type = (uint8_t)(CheatCodes[j].Addr >> 24);
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taddr = (CheatCodes[j].Addr & 0x001FFFFF);
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val = CheatCodes[j].Val;
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if (type == CHEAT_CONST8) {
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for (k = 0; k < ((addr >> 8) & 0xFF); k++) {
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psxMemWrite8(taddr, (u8)val);
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taddr += (s8)(addr & 0xFF);
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val += (s8)(CheatCodes[j - 1].Val & 0xFF);
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}
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} else if (type == CHEAT_CONST16) {
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for (k = 0; k < ((addr >> 8) & 0xFF); k++) {
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psxMemWrite16(taddr, val);
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taddr += (s8)(addr & 0xFF);
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val += (s8)(CheatCodes[j - 1].Val & 0xFF);
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}
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}
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break;
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case CHEAT_MEMCPY:
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j++;
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if (j >= endindex)
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break;
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taddr = (CheatCodes[j].Addr & 0x001FFFFF);
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for (k = 0; k < val; k++) {
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psxMemWrite8(taddr + k, psxMemRead8(addr + k));
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}
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break;
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case CHEAT_EQU8:
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if (psxMemRead8(addr) != (u8)val)
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j++; // skip the next code
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break;
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case CHEAT_NOTEQU8:
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if (psxMemRead8(addr) == (u8)val)
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j++; // skip the next code
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break;
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case CHEAT_LESSTHAN8:
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if (psxMemRead8(addr) >= (u8)val)
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j++; // skip the next code
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break;
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case CHEAT_GREATERTHAN8:
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if (psxMemRead8(addr) <= (u8)val)
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j++; // skip the next code
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break;
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case CHEAT_EQU16:
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if (psxMemRead16(addr) != val)
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j++; // skip the next code
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break;
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case CHEAT_NOTEQU16:
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if (psxMemRead16(addr) == val)
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j++; // skip the next code
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break;
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case CHEAT_LESSTHAN16:
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if (psxMemRead16(addr) >= val)
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j++; // skip the next code
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break;
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case CHEAT_GREATERTHAN16:
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if (psxMemRead16(addr) <= val)
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j++; // skip the next code
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break;
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}
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}
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}
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}
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int AddCheat(const char *descr, char *code) {
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int c = 1;
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char *p1, *p2;
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if (NumCheats >= NumCheatsAllocated) {
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NumCheatsAllocated += ALLOC_INCREMENT;
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if (Cheats == NULL) {
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assert(NumCheats == 0);
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assert(NumCheatsAllocated == ALLOC_INCREMENT);
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Cheats = (Cheat *)malloc(sizeof(Cheat) * NumCheatsAllocated);
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} else {
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Cheats = (Cheat *)realloc(Cheats, sizeof(Cheat) * NumCheatsAllocated);
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}
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}
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Cheats[NumCheats].Descr = strdup(descr[0] ? descr : _("(Untitled)"));
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Cheats[NumCheats].Enabled = 0;
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Cheats[NumCheats].First = NumCodes;
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Cheats[NumCheats].n = 0;
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p1 = code;
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p2 = code;
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while (c) {
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unsigned int t1, t2;
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while (*p2 != '\n' && *p2 != '\0')
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p2++;
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if (*p2 == '\0')
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c = 0;
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*p2 = '\0';
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p2++;
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t1 = 0;
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t2 = 0;
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sscanf(p1, "%x %x", &t1, &t2);
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if (t1 > 0x10000000) {
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if (NumCodes >= NumCodesAllocated) {
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NumCodesAllocated += ALLOC_INCREMENT;
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if (CheatCodes == NULL) {
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assert(NumCodes == 0);
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assert(NumCodesAllocated == ALLOC_INCREMENT);
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CheatCodes = (CheatCode *)malloc(sizeof(CheatCode) * NumCodesAllocated);
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} else {
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CheatCodes = (CheatCode *)realloc(CheatCodes, sizeof(CheatCode) * NumCodesAllocated);
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}
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}
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CheatCodes[NumCodes].Addr = t1;
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CheatCodes[NumCodes].Val = t2;
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NumCodes++;
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Cheats[NumCheats].n++;
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}
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p1 = p2;
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}
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if (Cheats[NumCheats].n == 0) {
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return -1;
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}
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NumCheats++;
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return 0;
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}
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void RemoveCheat(int index) {
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assert(index >= 0 && index < NumCheats);
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free(Cheats[index].Descr);
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while (index < NumCheats - 1) {
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Cheats[index] = Cheats[index + 1];
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index++;
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}
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NumCheats--;
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}
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int EditCheat(int index, const char *descr, char *code) {
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int c = 1;
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int prev = NumCodes;
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char *p1, *p2;
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assert(index >= 0 && index < NumCheats);
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p1 = code;
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p2 = code;
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while (c) {
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unsigned int t1, t2;
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while (*p2 != '\n' && *p2 != '\0')
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p2++;
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if (*p2 == '\0')
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c = 0;
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*p2 = '\0';
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p2++;
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t1 = 0;
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t2 = 0;
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sscanf(p1, "%x %x", &t1, &t2);
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if (t1 > 0x10000000) {
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if (NumCodes >= NumCodesAllocated) {
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NumCodesAllocated += ALLOC_INCREMENT;
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if (CheatCodes == NULL) {
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assert(NumCodes == 0);
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assert(NumCodesAllocated == ALLOC_INCREMENT);
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CheatCodes = (CheatCode *)malloc(sizeof(CheatCode) * NumCodesAllocated);
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} else {
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CheatCodes = (CheatCode *)realloc(CheatCodes, sizeof(CheatCode) * NumCodesAllocated);
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}
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}
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CheatCodes[NumCodes].Addr = t1;
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CheatCodes[NumCodes].Val = t2;
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NumCodes++;
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}
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p1 = p2;
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}
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if (NumCodes == prev) {
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return -1;
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}
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free(Cheats[index].Descr);
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Cheats[index].Descr = strdup(descr[0] ? descr : _("(Untitled)"));
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Cheats[index].First = prev;
|
||
|
Cheats[index].n = NumCodes - prev;
|
||
|
|
||
|
return 0;
|
||
|
}
|