mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-24 00:20:01 +00:00
Start adding support for BPS patches.
This commit is contained in:
Themaister
parent
cb6086635c
commit
1ff9b6a375
2
Makefile
2
Makefile
@ -2,7 +2,7 @@ include config.mk
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TARGET = ssnes tools/ssnes-joyconfig
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OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o screenshot.o
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OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o bps.o strl.o screenshot.o
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JOYCONFIG_OBJ = tools/ssnes-joyconfig.o conf/config_file.o
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HEADERS = $(wildcard */*.h) $(wildcard *.h)
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174
bps.c
Normal file
174
bps.c
Normal file
@ -0,0 +1,174 @@
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/* 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 "bps.h"
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#include "movie.h"
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#include <stdint.h>
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#include <stdbool.h>
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enum bps_mode
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{
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SOURCE_READ = 0,
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TARGET_READ,
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SOURCE_COPY,
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TARGET_COPY
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};
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struct bps_data
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{
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const uint8_t *modify_data, *source_data;
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uint8_t *target_data;
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size_t modify_length, source_length, target_length;
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size_t modify_offset, source_offset, target_offset;
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uint32_t modify_checksum, source_checksum, target_checksum;
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size_t source_relative_offset, target_relative_offset, output_offset;
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};
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static uint8_t bps_read(struct bps_data *bps)
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{
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uint8_t data = bps->modify_data[bps->modify_offset++];
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bps->modify_checksum = crc32_adjust(bps->modify_checksum, data);
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return data;
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}
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static uint64_t bps_decode(struct bps_data *bps)
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{
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uint64_t data = 0, shift = 1;
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for (;;)
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{
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uint8_t x = bps_read(bps);
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data += (x & 0x7f) * shift;
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if (x & 0x80)
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break;
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shift <<= 7;
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data += shift;
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}
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return data;
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}
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static void bps_write(struct bps_data *bps, uint8_t data)
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{
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bps->target_data[bps->output_offset++] = data;
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bps->target_checksum = crc32_adjust(bps->target_checksum, data);
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}
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bps_error_t bps_apply_patch(
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const uint8_t *modify_data, size_t modify_length,
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const uint8_t *source_data, size_t source_length,
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uint8_t *target_data, size_t *target_length)
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{
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if (modify_length < 19)
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return BPS_PATCH_TOO_SMALL;
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struct bps_data bps = {
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.modify_data = modify_data,
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.target_data = target_data,
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.modify_length = modify_length,
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.source_data = source_data,
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.source_length = source_length,
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.modify_checksum = ~0,
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.target_checksum = ~0,
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};
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if ((bps_read(&bps) != 'B') || (bps_read(&bps) != 'P') || (bps_read(&bps) != 'S') || (bps_read(&bps) != '1'))
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return BPS_PATCH_INVALID_HEADER;
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size_t modify_source_size = bps_decode(&bps);
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size_t modify_target_size = bps_decode(&bps);
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size_t modify_markup_size = bps_decode(&bps);
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for (size_t i = 0; i < modify_markup_size; i++)
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bps_read(&bps);
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if (modify_source_size > bps.source_length)
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return BPS_SOURCE_TOO_SMALL;
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if (modify_target_size > bps.target_length)
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return BPS_TARGET_TOO_SMALL;
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while (bps.modify_offset < bps.modify_length - 12)
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{
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size_t length = bps_decode(&bps);
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unsigned mode = length & 3;
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length = (length >> 2) + 1;
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switch (mode)
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{
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case SOURCE_READ:
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while (length--)
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bps_write(&bps, bps.source_data[bps.output_offset]);
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break;
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case TARGET_READ:
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while (length--)
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bps_write(&bps, bps_read(&bps));
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break;
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case SOURCE_COPY:
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case TARGET_COPY:
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{
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int offset = bps_decode(&bps);
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bool negative = offset & 1;
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offset >>= 1;
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if (negative)
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offset = -offset;
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if (mode == SOURCE_COPY)
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{
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bps.source_offset += offset;
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while (length--)
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bps_write(&bps, bps.source_data[bps.source_offset++]);
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}
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else
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{
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bps.target_offset += offset;
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while (length--)
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bps_write(&bps, bps.target_data[bps.target_offset++]);
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break;
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}
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break;
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}
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}
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}
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uint32_t modify_source_checksum = 0, modify_target_checksum = 0, modify_modify_checksum = 0;
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for (unsigned i = 0; i < 32; i += 8)
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modify_source_checksum |= bps_read(&bps) << i;
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for (unsigned i = 0; i < 32; i += 8)
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modify_target_checksum |= bps_read(&bps) << i;
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uint32_t checksum = ~bps.modify_checksum;
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for (unsigned i = 0; i < 32; i += 8)
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modify_modify_checksum |= bps_read(&bps) << i;
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bps.source_checksum = crc32_calculate(bps.source_data, bps.source_length);
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bps.target_checksum = ~bps.target_checksum;
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if (bps.source_checksum != modify_source_checksum)
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return BPS_SOURCE_CHECKSUM_INVALID;
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if (bps.target_checksum != modify_target_checksum)
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return BPS_TARGET_CHECKSUM_INVALID;
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if (checksum != modify_modify_checksum)
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return BPS_PATCH_CHECKSUM_INVALID;
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*target_length = modify_target_size;
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return BPS_SUCCESS;
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}
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45
bps.h
Normal file
45
bps.h
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@ -0,0 +1,45 @@
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/* 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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#ifndef __BPS_H
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#define __BPS_H
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#include <stdint.h>
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#include <stddef.h>
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// BPS implementation from bSNES (nall::).
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typedef enum bps_error
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{
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BPS_UNKNOWN,
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BPS_SUCCESS,
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BPS_PATCH_TOO_SMALL,
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BPS_PATCH_INVALID_HEADER,
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BPS_SOURCE_TOO_SMALL,
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BPS_TARGET_TOO_SMALL,
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BPS_SOURCE_CHECKSUM_INVALID,
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BPS_TARGET_CHECKSUM_INVALID,
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BPS_PATCH_CHECKSUM_INVALID
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} bps_error_t;
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bps_error_t bps_apply_patch(
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const uint8_t *patch_data, size_t patch_length,
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const uint8_t *source_data, size_t source_length,
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uint8_t *target_data, size_t *target_length);
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#endif
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131
file.c
131
file.c
@ -24,6 +24,7 @@
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#include "dynamic.h"
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#include "movie.h"
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#include "ups.h"
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#include "bps.h"
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#include "strl.h"
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#ifdef HAVE_XML
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@ -116,6 +117,102 @@ error:
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return false;
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}
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enum patch_type
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{
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PATCH_NONE,
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PATCH_UPS,
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PATCH_BPS
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};
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static void patch_rom(uint8_t **buf, ssize_t *size)
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{
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uint8_t *ret_buf = *buf;
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ssize_t ret_size = *size;
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ssize_t patch_size = 0;
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void *patch_data = NULL;
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enum patch_type type = PATCH_NONE;
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if (*g_extern.ups_name && (patch_size = read_file(g_extern.ups_name, &patch_data)) >= 0)
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type = PATCH_UPS;
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else if (*g_extern.bps_name && (patch_size = read_file(g_extern.bps_name, &patch_data)) >= 0)
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type = PATCH_BPS;
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if (type == PATCH_NONE)
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{
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SSNES_LOG("Could not find any ROM patch.\n");
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return;
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}
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switch (type)
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{
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case PATCH_UPS:
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SSNES_LOG("Found UPS file in \"%s\", attempting to patch ...\n", g_extern.ups_name);
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break;
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case PATCH_BPS:
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SSNES_LOG("Found BPS file in \"%s\", attempting to patch ...\n", g_extern.bps_name);
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break;
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default:
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return; // Should not happen, but.
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}
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size_t target_size = ret_size * 4; // Just to be sure ...
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uint8_t *patched_rom = malloc(target_size);
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if (!patched_rom)
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{
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SSNES_ERR("Failed to allocate memory for patched ROM ...\n");
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goto error;
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}
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bool success = false;
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switch (type)
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{
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case PATCH_UPS:
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{
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ups_error_t err = ups_apply_patch(patch_data, patch_size, ret_buf, ret_size, patched_rom, &target_size);
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if (err == UPS_SUCCESS)
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{
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SSNES_LOG("ROM patched successfully (UPS)!\n");
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success = true;
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}
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break;
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}
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case PATCH_BPS:
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{
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bps_error_t err = bps_apply_patch(patch_data, patch_size, ret_buf, ret_size, patched_rom, &target_size);
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if (err == BPS_SUCCESS)
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{
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SSNES_LOG("ROM patched successfully (BPS)!\n");
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success = true;
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}
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break;
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}
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default:
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return;
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}
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if (success)
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{
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free(ret_buf);
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*buf = patched_rom;
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*size = target_size;
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}
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if (patch_data)
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free(patch_data);
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return;
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error:
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*buf = ret_buf;
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*size = ret_size;
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if (patch_data)
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free(patch_data);
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}
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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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@ -183,37 +280,6 @@ static ssize_t read_rom_file(FILE* file, void** buf)
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ret_buf = rom_buf;
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}
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// Patch with UPS.
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ssize_t ups_patch_size;
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void *ups_patch = NULL;
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if (*g_extern.ups_name && (ups_patch_size = read_file(g_extern.ups_name, &ups_patch)) >= 0)
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{
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SSNES_LOG("Found UPS file in \"%s\", attempting to patch ...\n", g_extern.ups_name);
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size_t target_size = ret * 4; // Just to be sure ...
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uint8_t *patched_rom = malloc(target_size);
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if (patched_rom)
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{
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ups_error_t err = ups_apply_patch(ups_patch, ups_patch_size, ret_buf, ret, patched_rom, &target_size);
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if (err == UPS_SUCCESS)
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{
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free(ret_buf);
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ret_buf = patched_rom;
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ret = target_size;
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SSNES_LOG("ROM patched successfully (UPS)!\n");
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}
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else
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{
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free(patched_rom);
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SSNES_LOG("ROM failed to patch (UPS).\n");
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}
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free(ups_patch);
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}
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}
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else if (*g_extern.ups_name)
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SSNES_LOG("Could not find UPS patch in: \"%s\".\n", g_extern.ups_name);
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// Remove copier header if present (512 first bytes).
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if ((ret & 0x7fff) == 512)
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{
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@ -221,6 +287,9 @@ static ssize_t read_rom_file(FILE* file, void** buf)
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ret -= 512;
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}
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// Attempt to apply a patch :)
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patch_rom(&ret_buf, &ret);
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g_extern.cart_crc = crc32_calculate(ret_buf, ret);
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#ifdef HAVE_XML
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sha256_hash(g_extern.sha256, ret_buf, ret);
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@ -182,6 +182,7 @@ struct global
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char savefile_name_bsrm[512];
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char savestate_name[256];
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char ups_name[512];
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char bps_name[512];
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char xml_name[512];
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unsigned state_slot;
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10
ssnes.c
10
ssnes.c
@ -1077,12 +1077,18 @@ static void fill_pathnames(void)
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if (!g_extern.bsv_movie_playback)
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fill_pathname(g_extern.bsv_movie_path, g_extern.savefile_name_srm, "", sizeof(g_extern.bsv_movie_path));
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if (!(*g_extern.ups_name) && *g_extern.basename)
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if (*g_extern.basename)
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{
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if (!(*g_extern.ups_name))
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fill_pathname_noext(g_extern.ups_name, g_extern.basename, ".ups", sizeof(g_extern.ups_name));
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if (!(*g_extern.xml_name) && *g_extern.basename)
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if (!(*g_extern.bps_name))
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fill_pathname_noext(g_extern.bps_name, g_extern.basename, ".bps", sizeof(g_extern.bps_name));
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if (!(*g_extern.xml_name))
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fill_pathname_noext(g_extern.xml_name, g_extern.basename, ".xml", sizeof(g_extern.xml_name));
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}
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}
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// Save or load state here.
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static void check_savestates(void)
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