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https://github.com/libretro/RetroArch
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485 lines
10 KiB
C
485 lines
10 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the 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 along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "file.h"
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#include "general.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <libsnes.hpp>
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#include <string.h>
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#include "dynamic.h"
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#include "movie.h"
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#ifdef _WIN32
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#include <io.h>
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#include <fcntl.h>
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#endif
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// Load SNES rom only. Applies a hack for headered ROMs.
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static ssize_t read_rom_file(FILE* file, void** buf)
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{
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ssize_t ret;
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if (file == NULL) // stdin
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{
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#ifdef _WIN32
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setmode(0, O_BINARY);
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#endif
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SSNES_LOG("Reading ROM from stdin ...\n");
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size_t buf_size = 0xFFFFF; // Some initial guesstimate.
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size_t buf_ptr = 0;
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char *rom_buf = malloc(buf_size);
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if (rom_buf == NULL)
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{
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SSNES_ERR("Couldn't allocate memory!\n");
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return -1;
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}
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for(;;)
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{
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size_t ret = fread(rom_buf + buf_ptr, 1, buf_size - buf_ptr, stdin);
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buf_ptr += ret;
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// We've reached the end
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if (buf_ptr < buf_size)
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break;
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rom_buf = realloc(rom_buf, buf_size * 2);
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if (rom_buf == NULL)
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{
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SSNES_ERR("Couldn't allocate memory!\n");
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return -1;
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}
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buf_size *= 2;
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}
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if ((buf_ptr & 0x7fff) == 512)
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{
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memmove(rom_buf, rom_buf + 512, buf_ptr - 512);
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buf_ptr -= 512;
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}
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*buf = rom_buf;
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ret = buf_ptr;
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}
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else
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{
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fseek(file, 0, SEEK_END);
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long length = ftell(file);
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rewind(file);
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if ((length & 0x7fff) == 512)
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{
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length -= 512;
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fseek(file, 512, SEEK_SET);
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}
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void *rom_buf = malloc(length);
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if ( rom_buf == NULL )
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{
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SSNES_ERR("Couldn't allocate memory!\n");
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return -1;
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}
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if ( fread(rom_buf, 1, length, file) < length )
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{
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SSNES_ERR("Didn't read whole file.\n");
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free(rom_buf);
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return -1;
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}
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*buf = rom_buf;
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ret = length;
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}
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g_extern.cart_crc = crc32_calculate(*buf, ret);
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return ret;
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}
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// Generic file loader.
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static ssize_t read_file(const char *path, void **buf)
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{
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void *rom_buf = NULL;
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FILE *file = fopen(path, "rb");
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if (!file)
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goto error;
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fseek(file, 0, SEEK_END);
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long len = ftell(file);
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ssize_t rc = 0;
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rewind(file);
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rom_buf = malloc(len);
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if (!rom_buf)
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{
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SSNES_ERR("Couldn't allocate memory!\n");
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goto error;
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}
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if ((rc = fread(rom_buf, 1, len, file)) < len)
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SSNES_WARN("Didn't read whole file.\n");
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*buf = rom_buf;
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fclose(file);
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return rc;
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error:
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if (file)
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fclose(file);
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free(rom_buf);
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*buf = NULL;
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return -1;
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}
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// Dump stuff to file.
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static bool dump_to_file(const char *path, const void *data, size_t size)
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{
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FILE *file = fopen(path, "wb");
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if (!file)
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return false;
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else
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{
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fwrite(data, 1, size, file);
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fclose(file);
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return true;
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}
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}
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bool save_state(const char* path)
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{
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SSNES_LOG("Saving state: \"%s\".\n", path);
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size_t size = psnes_serialize_size();
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if (size == 0)
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return false;
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void *data = malloc(size);
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if (!data)
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{
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SSNES_ERR("Failed to allocate memory for save state buffer.\n");
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return false;
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}
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SSNES_LOG("State size: %d bytes.\n", (int)size);
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psnes_serialize(data, size);
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bool ret = dump_to_file(path, data, size);
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free(data);
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if (!ret)
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SSNES_ERR("Failed to save state to \"%s\".\n", path);
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return ret;
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}
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bool load_state(const char* path)
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{
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SSNES_LOG("Loading state: \"%s\".\n", path);
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void *buf = NULL;
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ssize_t size = read_file(path, &buf);
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if (size < 0)
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{
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SSNES_ERR("Failed to load state from \"%s\".\n", path);
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return false;
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}
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else
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{
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SSNES_LOG("State size: %d bytes.\n", (int)size);
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psnes_unserialize(buf, size);
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}
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free(buf);
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return true;
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}
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void load_ram_file(const char* path, int type)
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{
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size_t size = psnes_get_memory_size(type);
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uint8_t *data = psnes_get_memory_data(type);
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if (size == 0 || !data)
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return;
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void *buf = NULL;
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ssize_t rc = read_file(path, &buf);
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if (rc <= size)
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memcpy(data, buf, size);
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free(buf);
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}
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void save_ram_file(const char* path, int type)
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{
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size_t size = psnes_get_memory_size(type);
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uint8_t *data = psnes_get_memory_data(type);
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if ( data && size > 0 )
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dump_to_file(path, data, size);
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}
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static bool load_sgb_rom(void)
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{
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void *rom_buf = NULL;
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ssize_t rom_len = 0;
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FILE *extra_rom = NULL;
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void *extra_rom_buf = NULL;
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ssize_t extra_rom_len = 0;
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if ((rom_len = read_rom_file(g_extern.rom_file, &rom_buf)) == -1)
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{
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SSNES_ERR("Could not read ROM file.\n");
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goto error;
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}
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extra_rom = fopen(g_extern.gb_rom_path, "rb");
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if (!extra_rom)
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{
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SSNES_ERR("Couldn't open GameBoy ROM!\n");
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goto error;
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}
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if ((extra_rom_len = read_rom_file(extra_rom, &extra_rom_buf)) == -1)
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{
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SSNES_ERR("Cannot read GameBoy rom.\n");
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goto error;
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}
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if (!psnes_load_cartridge_super_game_boy(
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NULL, rom_buf, rom_len,
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NULL, extra_rom_buf, extra_rom_len))
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{
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SSNES_ERR("Cannot load SGB/GameBoy rom.\n");
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goto error;
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}
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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if (extra_rom)
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fclose(extra_rom);
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free(rom_buf);
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free(extra_rom_buf);
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return true;
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error:
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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if (extra_rom)
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fclose(extra_rom);
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free(rom_buf);
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free(extra_rom_buf);
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return false;
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}
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static bool load_bsx_rom(bool slotted)
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{
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void *rom_buf = NULL;
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ssize_t rom_len = 0;
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FILE *extra_rom = NULL;
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void *extra_rom_buf = NULL;
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ssize_t extra_rom_len = 0;
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if ((rom_len = read_rom_file(g_extern.rom_file, &rom_buf)) == -1)
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{
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SSNES_ERR("Could not read ROM file.\n");
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goto error;
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}
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extra_rom = fopen(g_extern.bsx_rom_path, "rb");
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if (!extra_rom)
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{
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SSNES_ERR("Couldn't open BSX game rom!\n");
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goto error;
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}
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if ((extra_rom_len = read_rom_file(extra_rom, &extra_rom_buf)) == -1)
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{
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SSNES_ERR("Cannot read BSX game rom.\n");
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goto error;
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}
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if (slotted)
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{
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if (!psnes_load_cartridge_bsx_slotted(
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NULL, rom_buf, rom_len,
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NULL, extra_rom_buf, extra_rom_len))
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{
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SSNES_ERR("Cannot load BSX slotted rom.\n");
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goto error;
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}
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}
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else
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{
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if (!psnes_load_cartridge_bsx(
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NULL, rom_buf, rom_len,
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NULL, extra_rom_buf, extra_rom_len))
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{
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SSNES_ERR("Cannot load BSX rom.\n");
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goto error;
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}
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}
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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if (extra_rom)
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fclose(extra_rom);
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free(rom_buf);
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free(extra_rom_buf);
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return true;
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error:
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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if (extra_rom)
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fclose(extra_rom);
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free(rom_buf);
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free(extra_rom_buf);
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return false;
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}
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static bool load_sufami_rom(void)
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{
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void *rom_buf = NULL;
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ssize_t rom_len = 0;
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FILE *extra_rom[2] = {NULL};
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void *extra_rom_buf[2] = {NULL};
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ssize_t extra_rom_len[2] = {0};
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if ((rom_len = read_rom_file(g_extern.rom_file, &rom_buf)) == -1)
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{
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SSNES_ERR("Could not read ROM file.\n");
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goto error;
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}
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const char *roms[2] = { g_extern.sufami_rom_path[0], g_extern.sufami_rom_path[1] };
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for (int i = 0; i < 2; i++)
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{
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if (strlen(roms[i]) > 0)
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{
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extra_rom[i] = fopen(roms[i], "rb");
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if (!extra_rom[i])
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{
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SSNES_ERR("Couldn't open BSX game rom!\n");
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goto error;
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}
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if ((extra_rom_len[i] = read_rom_file(extra_rom[i], &extra_rom_buf[i])) == -1)
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{
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SSNES_ERR("Cannot read BSX game rom.\n");
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goto error;
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}
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}
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}
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if (!psnes_load_cartridge_sufami_turbo(
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NULL, rom_buf, rom_len,
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NULL, extra_rom_buf[0], extra_rom_len[0],
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NULL, extra_rom_buf[1], extra_rom_len[1]))
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{
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SSNES_ERR("Cannot load Sufami Turbo rom.\n");
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goto error;
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}
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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for (int i = 0; i < 2; i++)
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{
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if (extra_rom[i])
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fclose(extra_rom[i]);
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free(extra_rom_buf[i]);
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}
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free(rom_buf);
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return true;
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error:
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if (g_extern.rom_file)
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fclose(g_extern.rom_file);
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for (int i = 0; i < 2; i++)
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{
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if (extra_rom[i])
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fclose(extra_rom[i]);
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free(extra_rom_buf[i]);
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}
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free(rom_buf);
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return false;
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}
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static bool load_normal_rom(void)
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{
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void *rom_buf = NULL;
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ssize_t rom_len = 0;
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if ((rom_len = read_rom_file(g_extern.rom_file, &rom_buf)) == -1)
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{
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SSNES_ERR("Could not read ROM file.\n");
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return false;
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}
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if (g_extern.rom_file != NULL)
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fclose(g_extern.rom_file);
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SSNES_LOG("ROM size: %d bytes\n", (int)rom_len);
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if (!psnes_load_cartridge_normal(NULL, rom_buf, rom_len))
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{
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SSNES_ERR("ROM file is not valid!\n");
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free(rom_buf);
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return false;
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}
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free(rom_buf);
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return true;
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}
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bool init_rom_file(enum ssnes_game_type type)
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{
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switch (type)
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{
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case SSNES_CART_SGB:
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if (!load_sgb_rom())
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return false;
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break;
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case SSNES_CART_NORMAL:
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if (!load_normal_rom())
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return false;
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break;
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case SSNES_CART_BSX:
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if (!load_bsx_rom(false))
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return false;
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break;
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case SSNES_CART_BSX_SLOTTED:
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if (!load_bsx_rom(true))
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return false;
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break;
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case SSNES_CART_SUFAMI:
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if (!load_sufami_rom())
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return false;
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break;
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default:
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SSNES_ERR("Invalid ROM type!\n");
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return false;
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}
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return true;
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}
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