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sharkport.c
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sharkport.c
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/* Copyright (c) 2013-2021 Jeffrey Pfau
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <mgba/internal/gba/sharkport.h>
#include <mgba/internal/arm/macros.h>
#include <mgba/internal/gba/gba.h>
#include <mgba-util/vfs.h>
static const char* const SHARKPORT_HEADER = "SharkPortSave";
static const char* const GSV_HEADER = "ADVSAVEG";
static const char* const GSV_FOOTER = "xV4\x12";
static const int GSV_IDENT_OFFSET = 0xC;
static const int GSV_PAYLOAD_OFFSET = 0x430;
static bool _importSavedata(struct GBA* gba, void* payload, size_t size) {
bool success = false;
switch (gba->memory.savedata.type) {
case GBA_SAVEDATA_FLASH512:
if (size > GBA_SIZE_FLASH512) {
GBASavedataForceType(&gba->memory.savedata, GBA_SAVEDATA_FLASH1M);
}
// Fall through
default:
if (size > GBASavedataSize(&gba->memory.savedata)) {
size = GBASavedataSize(&gba->memory.savedata);
}
break;
case GBA_SAVEDATA_FORCE_NONE:
case GBA_SAVEDATA_AUTODETECT:
goto cleanup;
}
if (size == GBA_SIZE_EEPROM || size == GBA_SIZE_EEPROM512) {
size_t i;
for (i = 0; i < size; i += 8) {
uint32_t lo, hi;
LOAD_32BE(lo, i, payload);
LOAD_32BE(hi, i + 4, payload);
STORE_32LE(hi, i, gba->memory.savedata.data);
STORE_32LE(lo, i + 4, gba->memory.savedata.data);
}
} else {
memcpy(gba->memory.savedata.data, payload, size);
}
if (gba->memory.savedata.vf) {
gba->memory.savedata.vf->sync(gba->memory.savedata.vf, gba->memory.savedata.data, size);
}
success = true;
cleanup:
free(payload);
return success;
}
int GBASavedataSharkPortPayloadSize(struct VFile* vf) {
union {
char c[0x1C];
int32_t i;
} buffer;
vf->seek(vf, 0, SEEK_SET);
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
int32_t size;
LOAD_32(size, 0, &buffer.i);
if (size != (int32_t) strlen(SHARKPORT_HEADER)) {
return 0;
}
if (vf->read(vf, buffer.c, size) < size) {
return 0;
}
if (memcmp(SHARKPORT_HEADER, buffer.c, size) != 0) {
return 0;
}
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
LOAD_32(size, 0, &buffer.i);
if (size != 0x000F0000) {
// What is this value?
return 0;
}
// Skip first three fields
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
LOAD_32(size, 0, &buffer.i);
if (vf->seek(vf, size, SEEK_CUR) < 0) {
return 0;
}
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
LOAD_32(size, 0, &buffer.i);
if (vf->seek(vf, size, SEEK_CUR) < 0) {
return 0;
}
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
LOAD_32(size, 0, &buffer.i);
if (vf->seek(vf, size, SEEK_CUR) < 0) {
return 0;
}
// Read payload
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
LOAD_32(size, 0, &buffer.i);
return size;
}
void* GBASavedataSharkPortGetPayload(struct VFile* vf, size_t* osize, uint8_t* oheader, bool testChecksum) {
int32_t size = GBASavedataSharkPortPayloadSize(vf);
if (size < 0x1C || size > GBA_SIZE_FLASH1M + 0x1C) {
return NULL;
}
size -= 0x1C;
uint8_t header[0x1C];
int8_t* payload = malloc(size);
if (vf->read(vf, header, sizeof(header)) < (int) sizeof(header)) {
goto cleanup;
}
if (vf->read(vf, payload, size) < size) {
goto cleanup;
}
uint32_t buffer;
uint32_t checksum;
if (vf->read(vf, &buffer, 4) < 4) {
goto cleanup;
}
LOAD_32(checksum, 0, &buffer);
if (testChecksum) {
uint32_t calcChecksum = 0;
int i;
for (i = 0; i < (int) sizeof(header); ++i) {
calcChecksum += ((int32_t) header[i]) << (calcChecksum % 24);
}
for (i = 0; i < size; ++i) {
calcChecksum += ((int32_t) payload[i]) << (calcChecksum % 24);
}
if (calcChecksum != checksum) {
return NULL;
}
}
*osize = size;
if (oheader) {
memcpy(oheader, header, sizeof(header));
}
return payload;
cleanup:
free(payload);
return NULL;
}
bool GBASavedataImportSharkPort(struct GBA* gba, struct VFile* vf, bool testChecksum) {
uint8_t buffer[0x1C];
uint8_t header[0x1C];
size_t size;
void* payload = GBASavedataSharkPortGetPayload(vf, &size, header, testChecksum);
if (!payload) {
return false;
}
struct GBACartridge* cart = (struct GBACartridge*) gba->memory.rom;
memcpy(buffer, &cart->title, 16);
buffer[0x10] = 0;
buffer[0x11] = 0;
buffer[0x12] = cart->checksum;
buffer[0x13] = cart->maker;
buffer[0x14] = 1;
buffer[0x15] = 0;
buffer[0x16] = 0;
buffer[0x17] = 0;
buffer[0x18] = 0;
buffer[0x19] = 0;
buffer[0x1A] = 0;
buffer[0x1B] = 0;
if (memcmp(buffer, header, testChecksum ? 0x1C : 0xF) != 0) {
free(payload);
return false;
}
return _importSavedata(gba, payload, size);
}
bool GBASavedataExportSharkPort(const struct GBA* gba, struct VFile* vf) {
union {
char c[0x1C];
int32_t i;
} buffer;
int32_t size = strlen(SHARKPORT_HEADER);
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
if (vf->write(vf, SHARKPORT_HEADER, size) < size) {
return false;
}
size = 0x000F0000;
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
const struct GBACartridge* cart = (const struct GBACartridge*) gba->memory.rom;
size = sizeof(cart->title);
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
if (vf->write(vf, cart->title, size) < 4) {
return false;
}
time_t t = time(0);
struct tm* tm = localtime(&t);
size = strftime(&buffer.c[4], sizeof(buffer.c) - 4, "%m/%d/%Y %I:%M:%S %p", tm);
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, buffer.c, size + 4) < size + 4) {
return false;
}
// Last field is blank
size = 0;
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
// Write payload
size = 0x1C + GBASavedataSize(&gba->memory.savedata);
if (size == 0x1C) {
return false;
}
STORE_32(size, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
size -= 0x1C;
memcpy(buffer.c, &cart->title, 16);
buffer.c[0x10] = 0;
buffer.c[0x11] = 0;
buffer.c[0x12] = cart->checksum;
buffer.c[0x13] = cart->maker;
buffer.c[0x14] = 1;
buffer.c[0x15] = 0;
buffer.c[0x16] = 0;
buffer.c[0x17] = 0;
buffer.c[0x18] = 0;
buffer.c[0x19] = 0;
buffer.c[0x1A] = 0;
buffer.c[0x1B] = 0;
if (vf->write(vf, buffer.c, 0x1C) < 0x1C) {
return false;
}
uint32_t checksum = 0;
ssize_t i;
for (i = 0; i < 0x1C; ++i) {
checksum += buffer.c[i] << (checksum % 24);
}
if (gba->memory.savedata.type == GBA_SAVEDATA_EEPROM) {
for (i = 0; i < size; ++i) {
char byte = gba->memory.savedata.data[i ^ 7];
checksum += byte << (checksum % 24);
vf->write(vf, &byte, 1);
}
} else if (vf->write(vf, gba->memory.savedata.data, size) < size) {
return false;
} else {
for (i = 0; i < size; ++i) {
checksum += ((char) gba->memory.savedata.data[i]) << (checksum % 24);
}
}
STORE_32(checksum, 0, &buffer.i);
if (vf->write(vf, &buffer.i, 4) < 4) {
return false;
}
return true;
}
int GBASavedataGSVPayloadSize(struct VFile* vf) {
union {
char c[8];
int32_t i;
} buffer;
vf->seek(vf, 0, SEEK_SET);
if (vf->read(vf, &buffer.c, 8) < 8) {
return 0;
}
if (memcmp(GSV_HEADER, buffer.c, 8) != 0) {
return 0;
}
// Skip the checksum
if (vf->read(vf, &buffer.i, 4) < 4) {
return 0;
}
struct {
char name[12];
int padding;
int type;
int unk[3];
char description[0x400];
char footer[4];
} header;
if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
return 0;
}
if (memcmp(GSV_FOOTER, header.footer, 4) != 0) {
return 0;
}
int type;
LOAD_32(type, 0, &header.type);
switch (type) {
case 2:
return GBA_SIZE_SRAM;
case 3:
return GBA_SIZE_EEPROM512;
case 4:
return GBA_SIZE_EEPROM;
case 5:
return GBA_SIZE_FLASH512;
case 6:
return GBA_SIZE_FLASH1M; // Unconfirmed
default:
return vf->size(vf) - GSV_PAYLOAD_OFFSET;
}
}
void* GBASavedataGSVGetPayload(struct VFile* vf, size_t* osize, uint8_t* ident, bool testChecksum) {
int32_t size = GBASavedataGSVPayloadSize(vf);
if (!size || size > GBA_SIZE_FLASH1M) {
return NULL;
}
vf->seek(vf, GSV_IDENT_OFFSET, SEEK_SET);
if (ident && vf->read(vf, ident, 12) != 12) {
return NULL;
}
vf->seek(vf, GSV_PAYLOAD_OFFSET, SEEK_SET);
int8_t* payload = malloc(size);
if (vf->read(vf, payload, size) != size) {
free(payload);
return NULL;
}
UNUSED(testChecksum); // The checksum format is currently unknown
*osize = size;
return payload;
}
bool GBASavedataImportGSV(struct GBA* gba, struct VFile* vf, bool testChecksum) {
size_t size;
uint8_t ident[12];
void* payload = GBASavedataGSVGetPayload(vf, &size, ident, testChecksum);
if (!payload) {
return false;
}
struct GBACartridge* cart = (struct GBACartridge*) gba->memory.rom;
if (memcmp(ident, cart->title, sizeof(ident)) != 0) {
free(payload);
return false;
}
return _importSavedata(gba, payload, size);
}