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Diffstat (limited to 'src/cheats2.c')
| -rw-r--r-- | src/cheats2.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/src/cheats2.c b/src/cheats2.c new file mode 100644 index 0000000..3e8017e --- /dev/null +++ b/src/cheats2.c @@ -0,0 +1,232 @@ +/* + * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator. + * + * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and + * Jerremy Koot (jkoot@snes9x.com) + * + * Super FX C emulator code + * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and + * Gary Henderson. + * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_. + * + * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson. + * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_. + * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com). + * + * DOS port code contains the works of other authors. See headers in + * individual files. + * + * Snes9x homepage: http://www.snes9x.com + * + * Permission to use, copy, modify and distribute Snes9x in both binary and + * source form, for non-commercial purposes, is hereby granted without fee, + * providing that this license information and copyright notice appear with + * all copies and any derived work. + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event shall the authors be held liable for any damages + * arising from the use of this software. + * + * Snes9x is freeware for PERSONAL USE only. Commercial users should + * seek permission of the copyright holders first. Commercial use includes + * charging money for Snes9x or software derived from Snes9x. + * + * The copyright holders request that bug fixes and improvements to the code + * should be forwarded to them so everyone can benefit from the modifications + * in future versions. + * + * Super NES and Super Nintendo Entertainment System are trademarks of + * Nintendo Co., Limited and its subsidiary companies. + */ +#include <stdio.h> +#include <ctype.h> +#include <string.h> +#include "snes9x.h" +#include "cheats.h" +#include "memmap.h" + +extern SCheatData Cheat; + +void S9xInitCheatData () +{ + Cheat.RAM = Memory.RAM; + Cheat.SRAM = SRAM; + Cheat.FillRAM = Memory.FillRAM; +} + +void S9xAddCheat (bool8 enable, bool8 save_current_value, + uint32 address, uint8 byte) +{ + if (Cheat.num_cheats < sizeof (Cheat.c) / sizeof (Cheat. c [0])) + { + Cheat.c [Cheat.num_cheats].address = address; + Cheat.c [Cheat.num_cheats].byte = byte; + Cheat.c [Cheat.num_cheats].enabled = TRUE; + if (save_current_value) + { + Cheat.c [Cheat.num_cheats].saved_byte = S9xGetByte (address); + Cheat.c [Cheat.num_cheats].saved = TRUE; + } + Cheat.num_cheats++; + } +} + +void S9xDeleteCheat (uint32 which1) +{ + if (which1 < Cheat.num_cheats) + { + if (Cheat.c [which1].enabled) + S9xRemoveCheat (which1); + + memmove (&Cheat.c [which1], &Cheat.c [which1 + 1], + sizeof (Cheat.c [0]) * (Cheat.num_cheats - which1 - 1)); + Cheat.num_cheats = 0; + } +} + +void S9xDeleteCheats () +{ + S9xRemoveCheats (); + Cheat.num_cheats = 0; +} + +void S9xEnableCheat (uint32 which1) +{ + if (which1 < Cheat.num_cheats && !Cheat.c [which1].enabled) + { + Cheat.c [which1].enabled = TRUE; + S9xApplyCheat (which1); + } +} + +void S9xDisableCheat (uint32 which1) +{ + if (which1 < Cheat.num_cheats && Cheat.c [which1].enabled) + { + S9xRemoveCheat (which1); + Cheat.c [which1].enabled = FALSE; + } +} + +void S9xRemoveCheat (uint32 which1) +{ + if (Cheat.c [which1].saved) + { + uint32 address = Cheat.c [which1].address; + + int block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK; + uint8 *ptr = Memory.Map [block]; + + if (ptr >= (uint8 *) MAP_LAST) + *(ptr + (address & 0xffff)) = Cheat.c [which1].saved_byte; + else + S9xSetByte (address, Cheat.c [which1].saved_byte); + } +} + +void S9xApplyCheat (uint32 which1) +{ + uint32 address = Cheat.c [which1].address; + + if (!Cheat.c [which1].saved) + Cheat.c [which1].saved_byte = S9xGetByte (address); + + int block = (address >> MEMMAP_SHIFT) & MEMMAP_MASK; + uint8 *ptr = Memory.Map [block]; + + if (ptr >= (uint8 *) MAP_LAST) + *(ptr + (address & 0xffff)) = Cheat.c [which1].byte; + else + S9xSetByte (address, Cheat.c [which1].byte); + Cheat.c [which1].saved = TRUE; +} + +void S9xApplyCheats () +{ + if (Settings.ApplyCheats) + { + uint32 i; + for (i = 0; i < Cheat.num_cheats; i++) + if (Cheat.c [i].enabled) + S9xApplyCheat (i); + } +} + +void S9xRemoveCheats () +{ + uint32 i; + for (i = 0; i < Cheat.num_cheats; i++) + if (Cheat.c [i].enabled) + S9xRemoveCheat (i); +} + +bool8 S9xLoadCheatFile (const char *filename) +{ + Cheat.num_cheats = 0; + + FILE *fs = fopen (filename, "rb"); + uint8 data [28]; + + if (!fs) + return (FALSE); + + while (fread ((void *) data, 1, 28, fs) == 28) + { + Cheat.c [Cheat.num_cheats].enabled = (data [0] & 4) == 0; + Cheat.c [Cheat.num_cheats].byte = data [1]; + Cheat.c [Cheat.num_cheats].address = data [2] | (data [3] << 8) | (data [4] << 16); + Cheat.c [Cheat.num_cheats].saved_byte = data [5]; + Cheat.c [Cheat.num_cheats].saved = (data [0] & 8) != 0; + memmove (Cheat.c [Cheat.num_cheats].name, &data [8], 20); + Cheat.c [Cheat.num_cheats++].name [20] = 0; + } + fclose (fs); + + return (TRUE); +} + +bool8 S9xSaveCheatFile (const char *filename) +{ + if (Cheat.num_cheats == 0) + { + (void) remove (filename); + return (TRUE); + } + + FILE *fs = fopen (filename, "wb"); + uint8 data [28]; + + if (!fs) + return (FALSE); + + uint32 i; + for (i = 0; i < Cheat.num_cheats; i++) + { + memset (data, 0, 28); + if (i == 0) + { + data [6] = 254; + data [7] = 252; + } + if (!Cheat.c [i].enabled) + data [0] |= 4; + + if (Cheat.c [i].saved) + data [0] |= 8; + + data [1] = Cheat.c [i].byte; + data [2] = (uint8) Cheat.c [i].address; + data [3] = (uint8) (Cheat.c [i].address >> 8); + data [4] = (uint8) (Cheat.c [i].address >> 16); + data [5] = Cheat.c [i].saved_byte; + + memmove (&data [8], Cheat.c [i].name, 19); + if (fwrite (data, 28, 1, fs) != 1) + { + fclose (fs); + return (FALSE); + } + } + return (fclose (fs) == 0); +} + |