mirror of
https://github.com/libretro/RetroArch
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Merge ups/bps into patch.c.
This commit is contained in:
Themaister
parent
2a6551a62a
commit
ef72584568
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 gfx/gfx_common.o ups.o bps.o compat/strl.o compat/getopt.o screenshot.o audio/utils.o
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OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o gfx/gfx_common.o patch.o compat/strl.o compat/getopt.o screenshot.o audio/utils.o
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JOYCONFIG_OBJ = tools/ssnes-joyconfig.o conf/config_file.o compat/strl.o
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HEADERS = $(wildcard */*.h) $(wildcard *.h)
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@ -1,6 +1,6 @@
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TARGET = ssnes.exe
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JTARGET = ssnes-joyconfig.exe
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OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o gfx/gfx_common.o bps.o ups.o compat/strl.o screenshot.o compat/getopt.o audio/utils.o compat/posix_string.o
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OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o gfx/gfx_common.o patch.o compat/strl.o screenshot.o compat/getopt.o audio/utils.o compat/posix_string.o
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JOBJ = conf/config_file.o tools/ssnes-joyconfig.o compat/strl.o compat/posix_string.o
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CC = gcc
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147
bps.c → patch.c
147
bps.c → patch.c
@ -16,10 +16,11 @@
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*/
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#include "bps.h"
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#include "ups.h"
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#include "movie.h"
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#include <stdint.h>
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#include "boolean.h"
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#include "msvc/msvc_compat.h"
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#include <stdint.h>
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enum bps_mode
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{
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@ -172,3 +173,147 @@ bps_error_t bps_apply_patch(
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return BPS_SUCCESS;
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}
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struct ups_data
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{
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const uint8_t *patch_data, *source_data;
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uint8_t *target_data;
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unsigned patch_length, source_length, target_length;
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unsigned patch_offset, source_offset, target_offset;
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unsigned patch_checksum, source_checksum, target_checksum;
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};
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static uint8_t ups_patch_read(struct ups_data *data)
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{
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if (data->patch_offset < data->patch_length)
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{
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uint8_t n = data->patch_data[data->patch_offset++];
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data->patch_checksum = crc32_adjust(data->patch_checksum, n);
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return n;
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}
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return 0x00;
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}
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static uint8_t ups_source_read(struct ups_data *data)
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{
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if (data->source_offset < data->source_length)
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{
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uint8_t n = data->source_data[data->source_offset++];
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data->source_checksum = crc32_adjust(data->source_checksum, n);
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return n;
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}
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return 0x00;
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}
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static void ups_target_write(struct ups_data *data, uint8_t n)
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{
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if (data->target_offset < data->target_length)
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{
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data->target_data[data->target_offset] = n;
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data->target_checksum = crc32_adjust(data->target_checksum, n);
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}
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data->target_offset++;
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}
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static uint64_t ups_decode(struct ups_data *data)
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{
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uint64_t offset = 0, shift = 1;
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while (true)
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{
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uint8_t x = ups_patch_read(data);
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offset += (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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offset += shift;
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}
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return offset;
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}
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ups_error_t ups_apply_patch(
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const uint8_t *patchdata, size_t patchlength,
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const uint8_t *sourcedata, size_t sourcelength,
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uint8_t *targetdata, size_t *targetlength)
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{
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struct ups_data data = {0};
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data.patch_data = patchdata;
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data.source_data = sourcedata;
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data.target_data = targetdata;
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data.patch_length = patchlength;
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data.source_length = sourcelength;
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data.target_length = *targetlength;
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data.patch_checksum = ~0;
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data.source_checksum = ~0;
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data.target_checksum = ~0;
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if (data.patch_length < 18)
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return UPS_PATCH_INVALID;
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if (ups_patch_read(&data) != 'U')
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return UPS_PATCH_INVALID;
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if (ups_patch_read(&data) != 'P')
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return UPS_PATCH_INVALID;
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if (ups_patch_read(&data) != 'S')
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return UPS_PATCH_INVALID;
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if (ups_patch_read(&data) != '1')
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return UPS_PATCH_INVALID;
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unsigned source_read_length = ups_decode(&data);
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unsigned target_read_length = ups_decode(&data);
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if (data.source_length != source_read_length && data.source_length != target_read_length)
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return UPS_SOURCE_INVALID;
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*targetlength = (data.source_length == source_read_length ? target_read_length : source_read_length);
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if (data.target_length < *targetlength)
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return UPS_TARGET_TOO_SMALL;
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data.target_length = *targetlength;
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while (data.patch_offset < data.patch_length - 12)
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{
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unsigned length = ups_decode(&data);
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while (length--)
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ups_target_write(&data, ups_source_read(&data));
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while (true)
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{
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uint8_t patch_xor = ups_patch_read(&data);
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ups_target_write(&data, patch_xor ^ ups_source_read(&data));
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if (patch_xor == 0) break;
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}
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}
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while (data.source_offset < data.source_length)
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ups_target_write(&data, ups_source_read(&data));
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while (data.target_offset < data.target_length)
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ups_target_write(&data, ups_source_read(&data));
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uint32_t patch_read_checksum = 0, source_read_checksum = 0, target_read_checksum = 0;
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for (unsigned i = 0; i < 4; i++)
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source_read_checksum |= ups_patch_read(&data) << (i * 8);
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for (unsigned i = 0; i < 4; i++)
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target_read_checksum |= ups_patch_read(&data) << (i * 8);
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uint32_t patch_result_checksum = ~data.patch_checksum;
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data.source_checksum = ~data.source_checksum;
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data.target_checksum = ~data.target_checksum;
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for (unsigned i = 0; i < 4; i++)
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patch_read_checksum |= ups_patch_read(&data) << (i * 8);
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if (patch_result_checksum != patch_read_checksum)
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return UPS_PATCH_INVALID;
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if (data.source_checksum == source_read_checksum && data.source_length == source_read_length)
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{
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if (data.target_checksum == target_read_checksum && data.target_length == target_read_length)
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return UPS_SUCCESS;
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return UPS_TARGET_INVALID;
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}
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else if (data.source_checksum == target_read_checksum && data.source_length == target_read_length)
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{
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if (data.target_checksum == source_read_checksum && data.target_length == source_read_length)
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return UPS_SUCCESS;
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return UPS_TARGET_INVALID;
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}
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else
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return UPS_SOURCE_INVALID;
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}
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165
ups.c
165
ups.c
@ -1,165 +0,0 @@
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/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2012 - 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 "ups.h"
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#include "movie.h"
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#include "msvc/msvc_compat.h"
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struct ups_data
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{
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const uint8_t *patch_data, *source_data;
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uint8_t *target_data;
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unsigned patch_length, source_length, target_length;
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unsigned patch_offset, source_offset, target_offset;
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unsigned patch_checksum, source_checksum, target_checksum;
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};
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static uint8_t patch_read(struct ups_data *data)
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{
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if (data->patch_offset < data->patch_length)
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{
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uint8_t n = data->patch_data[data->patch_offset++];
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data->patch_checksum = crc32_adjust(data->patch_checksum, n);
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return n;
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}
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return 0x00;
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}
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static uint8_t source_read(struct ups_data *data)
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{
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if (data->source_offset < data->source_length)
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{
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uint8_t n = data->source_data[data->source_offset++];
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data->source_checksum = crc32_adjust(data->source_checksum, n);
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return n;
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}
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return 0x00;
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}
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static void target_write(struct ups_data *data, uint8_t n)
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{
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if (data->target_offset < data->target_length)
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{
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data->target_data[data->target_offset] = n;
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data->target_checksum = crc32_adjust(data->target_checksum, n);
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}
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data->target_offset++;
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}
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static uint64_t decode(struct ups_data *data)
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{
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uint64_t offset = 0, shift = 1;
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while (true)
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{
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uint8_t x = patch_read(data);
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offset += (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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offset += shift;
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}
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return offset;
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}
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ups_error_t ups_apply_patch(
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const uint8_t *patchdata, size_t patchlength,
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const uint8_t *sourcedata, size_t sourcelength,
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uint8_t *targetdata, size_t *targetlength)
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{
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struct ups_data data = {0};
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data.patch_data = patchdata;
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data.source_data = sourcedata;
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data.target_data = targetdata;
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data.patch_length = patchlength;
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data.source_length = sourcelength;
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data.target_length = *targetlength;
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data.patch_checksum = ~0;
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data.source_checksum = ~0;
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data.target_checksum = ~0;
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if (data.patch_length < 18)
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return UPS_PATCH_INVALID;
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if (patch_read(&data) != 'U')
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return UPS_PATCH_INVALID;
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if (patch_read(&data) != 'P')
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return UPS_PATCH_INVALID;
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if (patch_read(&data) != 'S')
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return UPS_PATCH_INVALID;
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if (patch_read(&data) != '1')
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return UPS_PATCH_INVALID;
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unsigned source_read_length = decode(&data);
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unsigned target_read_length = decode(&data);
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if (data.source_length != source_read_length && data.source_length != target_read_length)
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return UPS_SOURCE_INVALID;
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*targetlength = (data.source_length == source_read_length ? target_read_length : source_read_length);
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if (data.target_length < *targetlength)
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return UPS_TARGET_TOO_SMALL;
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data.target_length = *targetlength;
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while (data.patch_offset < data.patch_length - 12)
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{
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unsigned length = decode(&data);
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while (length--)
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target_write(&data, source_read(&data));
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while (true)
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{
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uint8_t patch_xor = patch_read(&data);
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target_write(&data, patch_xor ^ source_read(&data));
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if (patch_xor == 0) break;
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}
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}
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while (data.source_offset < data.source_length)
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target_write(&data, source_read(&data));
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while (data.target_offset < data.target_length)
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target_write(&data, source_read(&data));
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uint32_t patch_read_checksum = 0, source_read_checksum = 0, target_read_checksum = 0;
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for (unsigned i = 0; i < 4; i++)
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source_read_checksum |= patch_read(&data) << (i * 8);
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for (unsigned i = 0; i < 4; i++)
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target_read_checksum |= patch_read(&data) << (i * 8);
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uint32_t patch_result_checksum = ~data.patch_checksum;
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data.source_checksum = ~data.source_checksum;
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data.target_checksum = ~data.target_checksum;
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for (unsigned i = 0; i < 4; i++)
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patch_read_checksum |= patch_read(&data) << (i * 8);
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if (patch_result_checksum != patch_read_checksum)
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return UPS_PATCH_INVALID;
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if (data.source_checksum == source_read_checksum && data.source_length == source_read_length)
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{
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if (data.target_checksum == target_read_checksum && data.target_length == target_read_length)
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return UPS_SUCCESS;
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return UPS_TARGET_INVALID;
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}
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else if (data.source_checksum == target_read_checksum && data.source_length == target_read_length)
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{
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if (data.target_checksum == source_read_checksum && data.target_length == source_read_length)
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return UPS_SUCCESS;
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return UPS_TARGET_INVALID;
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}
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else
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return UPS_SOURCE_INVALID;
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}
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