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Add PocketNES interoperability

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* Ability to load PocketNES ROMs that contain one NES ROM
* Ability to read/write PocketNES SRAM data if it already exists
This commit is contained in:
libertyernie 2017-08-29 12:07:19 -05:00
parent e41ae649cb
commit 5800f2e688
12 changed files with 10975 additions and 0 deletions
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99
source/fceuram.cpp
View File

@ -25,6 +25,7 @@
#include "menu.h"
#include "filebrowser.h"
#include "fileop.h"
#include "pocketnes/goombasav.h"
static u32 WiiFCEU_GameSave(CartInfo *LocalHWInfo, int operation)
{
@ -74,6 +75,57 @@ bool SaveRAM (char * filepath, bool silent)
else if(GameInfo->type == GIT_VSUNI)
datasize = WiiFCEU_GameSave(&UNIFCart, 0);
if (datasize)
{
// Check to see if this is a PocketNES save file
FILE* file = fopen(filepath, "rb");
if (file)
{
uint32 tag;
fread(&tag, sizeof(uint32), 1, file);
fclose(file);
if (goomba_is_sram(&tag))
{
// Look for just one save file. If there aren't any, or there is more than one, don't read any data.
stateheader* sh1 = NULL;
stateheader* sh2 = NULL;
stateheader* sh = (stateheader*)(savebuffer + 4);
while (sh && stateheader_plausible(sh)) {
if (little_endian_conv_16(sh->type) != GOOMBA_SRAMSAVE) {}
else if (sh1 == NULL) {
sh1 = sh;
}
else {
sh2 = sh;
break;
}
sh = stateheader_advance(sh);
}
if (sh1 == NULL)
{
ErrorPrompt("PocketNES save file has no SRAM.");
datasize = 0;
}
else if (sh2 != NULL)
{
ErrorPrompt("PocketNES save file has more than one SRAM.");
datasize = 0;
}
else
{
char* newdata = goomba_new_sav(savebuffer, sh1, savebuffer, datasize);
memcpy(savebuffer, newdata, GOOMBA_COLOR_SRAM_SIZE);
datasize = GOOMBA_COLOR_SRAM_SIZE;
free(newdata);
}
}
}
}
if (datasize)
{
offset = SaveFile(filepath, datasize, silent);
@ -121,6 +173,53 @@ bool LoadRAM (char * filepath, bool silent)
offset = LoadFile(filepath, silent);
// Check to see if this is a PocketNES save file
if (goomba_is_sram(savebuffer))
{
// Look for just one save file. If there aren't any, or there is more than one, don't read any data.
stateheader* sh1 = NULL;
stateheader* sh2 = NULL;
stateheader* sh = (stateheader*)(savebuffer + 4);
while (sh && stateheader_plausible(sh)) {
if (little_endian_conv_16(sh->type) != GOOMBA_SRAMSAVE) {
InfoPrompt("Not sram");
}
else if (sh1 == NULL) {
sh1 = sh;
}
else {
sh2 = sh;
break;
}
sh = stateheader_advance(sh);
}
if (sh1 == NULL)
{
ErrorPrompt("PocketNES save file has no SRAM.");
offset = 0;
}
else if (sh2 != NULL)
{
ErrorPrompt("PocketNES save file has more than one SRAM.");
offset = 0;
}
else
{
goomba_size_t len;
void* extracted = goomba_extract(savebuffer, sh1, &len);
if (!extracted)
ErrorPrompt(goomba_last_error());
else
{
memcpy(savebuffer, extracted, len);
offset = len;
free(extracted);
}
}
}
if (offset > 0)
{
if(GameInfo->type == GIT_CART)

30
source/filebrowser.cpp
View File

@ -31,6 +31,8 @@
#include "fceuram.h"
#include "fceustate.h"
#include "patch.h"
#include "pocketnes/goombasav.h"
#include "pocketnes/pocketnesrom.h"
BROWSERINFO browser;
BROWSERENTRY * browserList = NULL; // list of files/folders in browser
@ -353,6 +355,12 @@ static bool IsValidROM()
if (p != NULL)
{
if(strcasecmp(p, ".gba") == 0)
{
// File will be checked for GBA ROMs later.
return true;
}
char * zippedFilename = NULL;
if(stricmp(p, ".zip") == 0 && !inSz)
@ -480,6 +488,28 @@ int BrowserLoadFile()
goto done;
filesize = LoadFile ((char *)nesrom, filepath, browserList[browser.selIndex].length, NOTSILENT);
// check nesrom for PocketNES embedded roms
const char *ext = strrchr(filepath, '.');
if (ext != NULL && strcmp(ext, ".gba") == 0)
{
const pocketnes_romheader* rom1 = pocketnes_first_rom(nesrom, filesize);
const pocketnes_romheader* rom2 = NULL;
if (rom1 != NULL) {
rom2 = pocketnes_next_rom(nesrom, filesize, rom1);
}
if (rom1 == NULL)
ErrorPrompt("No NES ROMs found in this file.");
else if (rom2 != NULL)
ErrorPrompt("More than one NES ROM found in this file. Only files with one ROM are supported.");
else
{
const void* rom = rom1 + 1;
filesize = little_endian_conv_32(rom1->filesize);
memcpy(nesrom, rom, filesize);
}
}
}
else
{

1
source/fileop.cpp
View File

@ -569,6 +569,7 @@ static bool ParseDirEntries()
if( stricmp(ext, "nes") != 0 && stricmp(ext, "fds") != 0 &&
stricmp(ext, "nsf") != 0 && stricmp(ext, "unf") != 0 &&
stricmp(ext, "nez") != 0 && stricmp(ext, "unif") != 0 &&
stricmp(ext, "gba") != 0 &&
stricmp(ext, "zip") != 0 && stricmp(ext, "7z") != 0)
continue;
}

506
source/pocketnes/goombasav.cpp Normal file
View File

@ -0,0 +1,506 @@
/* goombasav.c - functions to handle Goomba / Goomba Color SRAM
Copyright (C) 2014-2017 libertyernie
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
https://github.com/libertyernie/goombasav
When compiling in Visual Studio, set the project to compile
as C++ code (Properties -> C/C++ -> Advanced -> Compile As.)
*/
#include <memory.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "goombasav.h"
#include "minilzo/minilzo.h"
#define goomba_error(...) { sprintf(last_error, __VA_ARGS__); }
#define F16 little_endian_conv_16
#define F32 little_endian_conv_32
static const char* const sleeptxt[] = { "5min", "10min", "30min", "OFF" };
static const char* const brightxt[] = { "I", "II", "III", "IIII", "IIIII" };
static char last_error[256] = "No error has occured yet.";
static char goomba_strbuf[256];
const char* goomba_last_error() {
return (const char*)last_error;
}
size_t goomba_set_last_error(const char* msg) {
size_t len = strlen(msg);
if (len > sizeof(last_error)-1) {
len = sizeof(last_error)-1;
}
memcpy(last_error, msg, len);
last_error[sizeof(last_error)-1] = '\0';
return len;
}
// For making a checksum of the compressed data.
// output_bytes is limited to 8 at maximum
uint64_t checksum_slow(const void* ptr, size_t length, int output_bytes) {
const unsigned char* p = (const unsigned char*)ptr;
uint64_t sum=0;
char* sumptr = (char*)&sum;
size_t j;
for (j=0;j<length;j++) {
int index = j%output_bytes;
sumptr[index] += *p;
p++;
}
return sum;
}
uint16_t little_endian_conv_16(uint16_t value) {
if (*(uint16_t *)"\0\xff" < 0x100) {
uint16_t buffer;
((char*)&buffer)[0] = ((char*)&value)[1];
((char*)&buffer)[1] = ((char*)&value)[0];
return buffer;
} else {
return value;
}
}
uint32_t little_endian_conv_32(uint32_t value) {
if (*(uint16_t *)"\0\xff" < 0x100) {
uint32_t buffer;
((char*)&buffer)[0] = ((char*)&value)[3];
((char*)&buffer)[1] = ((char*)&value)[2];
((char*)&buffer)[2] = ((char*)&value)[1];
((char*)&buffer)[3] = ((char*)&value)[0];
return buffer;
} else {
return value;
}
}
configdata_misc_strings configdata_get_misc(char misc) {
configdata_misc_strings s;
s.sleep = sleeptxt[misc & 0x3];
s.autoload_state = ((misc & 0x10) >> 4) ? "ON" : "OFF";
s.gamma = brightxt[(misc & 0xE0) >> 5];
return s;
}
const char* stateheader_typestr(uint16_t type) {
switch (type) {
case GOOMBA_STATESAVE:
return "Savestate";
case GOOMBA_SRAMSAVE:
return "SRAM";
case GOOMBA_CONFIGSAVE:
return "Configuration";
case GOOMBA_PALETTE: // Used by Goomba Paletted
return "Palette";
default:
return "Unknown"; // Stateheaders with these types are rejected by stateheader_plausible
}
}
const char* stateheader_str(const stateheader* sh) {
int j = 0;
j += sprintf(goomba_strbuf + j, "size: %u\n", F16(sh->size));
j += sprintf(goomba_strbuf + j, "type: %s (%u)\n", stateheader_typestr(F16(sh->type)), F16(sh->type));
if (F16(sh->type) == GOOMBA_CONFIGSAVE) {
configdata* cd = (configdata*)sh;
if (cd->size == sizeof(goomba_configdata)) {
const goomba_configdata* gcd = (const goomba_configdata*)cd;
j += sprintf(goomba_strbuf + j, "(goomba) bordercolor: %u\n", gcd->bordercolor);
j += sprintf(goomba_strbuf + j, "(goomba) palettebank: %u\n", gcd->palettebank);
configdata_misc_strings strs = configdata_get_misc(gcd->misc);
j += sprintf(goomba_strbuf + j, "(goomba) sleep: %s\n", strs.sleep);
j += sprintf(goomba_strbuf + j, "(goomba) autoload state: %s\n", strs.autoload_state);
j += sprintf(goomba_strbuf + j, "(goomba) gamma: %s\n", strs.gamma);
const pocketnes_configdata* pcd = (const pocketnes_configdata*)cd;
j += sprintf(goomba_strbuf + j, "(pocketnes) displaytype: %u\n", pcd->displaytype);
j += sprintf(goomba_strbuf + j, "(pocketnes) misc: %u\n", pcd->misc);
j += sprintf(goomba_strbuf + j, "rom checksum: %8X (0xE000-0xFFFF %s)\n", F32(gcd->sram_checksum),
gcd->sram_checksum != 0 ? "occupied" : "free");
j += sprintf(goomba_strbuf + j, "title: %s", gcd->reserved4);
} else if (cd->size == sizeof(smsadvance_configdata)) {
const smsadvance_configdata* scd = (const smsadvance_configdata*)cd;
j += sprintf(goomba_strbuf + j, "displaytype: %u\n", scd->displaytype);
j += sprintf(goomba_strbuf + j, "gammavalue: %u\n", scd->gammavalue);
j += sprintf(goomba_strbuf + j, "region: %u\n", scd->region);
j += sprintf(goomba_strbuf + j, "sleepflick: %u\n", scd->sleepflick);
j += sprintf(goomba_strbuf + j, "config: %u\n", scd->config);
j += sprintf(goomba_strbuf + j, "bcolor: %u\n", scd->bcolor);
j += sprintf(goomba_strbuf + j, "rom checksum: %8X (0xE000-0xFFFF %s)\n", F32(scd->sram_checksum),
scd->sram_checksum != 0 ? "occupied" : "free");
j += sprintf(goomba_strbuf + j, "title: %s", scd->reserved3);
}
} else {
j += sprintf(goomba_strbuf + j, "%scompressed_size: %u\n",
(F32(sh->uncompressed_size) < F16(sh->size) ? "" : "un"),
F32(sh->uncompressed_size));
j += sprintf(goomba_strbuf + j, "framecount: %u\n", F32(sh->framecount));
j += sprintf(goomba_strbuf + j, "rom checksum: %8X\n", F32(sh->checksum));
j += sprintf(goomba_strbuf + j, "title: %s", sh->title);
}
return goomba_strbuf;
}
const char* stateheader_summary_str(const stateheader* sh) {
sprintf(goomba_strbuf, "%s: %s (%u b / %u uncomp)", stateheader_typestr(
F16(sh->type)), sh->title, F16(sh->size), F32(sh->uncompressed_size));
return goomba_strbuf;
}
int stateheader_plausible(const void* ptr) {
const stateheader* sh = (const stateheader*)ptr;
uint16_t type = F16(sh->type);
if (type < 0 || type == 3 || type == 4 || type > 5) return 0;
return F16(sh->size) >= sizeof(stateheader) && // check size (at least 48)
(F16(sh->type) == GOOMBA_CONFIGSAVE || sh->uncompressed_size != 0); // check uncompressed_size, but not for configsave
// when checking for whether something equals 0, endian conversion is not necessary
}
stateheader* stateheader_advance(const stateheader* sh) {
if (!stateheader_plausible(sh)) return NULL;
uint16_t s = F16(sh->size);
char* c = (char*)sh;
c += s;
return (stateheader*)c;
}
const stateheader* stateheader_first(const void* gba_data) {
uint32_t* check = (uint32_t*)gba_data;
uint32_t check_le = F32(*check);
if (check_le == GOOMBA_STATEID) check++;
else if (check_le == POCKETNES_STATEID) check++;
else if (check_le == POCKETNES_STATEID2) check++;
else if (check_le == SMSADVANCE_STATEID) check++;
return stateheader_plausible(check)
? (stateheader*)check
: NULL;
}
const stateheader** stateheader_scan(const void* gba_data) {
const goomba_size_t psize = sizeof(stateheader*);
const stateheader** headers = (const stateheader**)malloc(psize * 64);
memset(headers, 0, psize * 64);
const stateheader* sh = stateheader_first(gba_data);
int i = 0;
while (stateheader_plausible(sh) && i < 63) {
headers[i] = sh;
i++;
sh = stateheader_advance(sh);
}
return headers;
}
const stateheader* stateheader_for(const void* gba_data, const char* gbc_title) {
char title[0x10];
memcpy(title, gbc_title, 0x0F);
title[0x0F] = '\0';
const stateheader* use_this = NULL;
const stateheader** headers = stateheader_scan(gba_data);
int i;
for (i = 0; headers[i] != NULL; i++) {
if (strcmp(headers[i]->title, title) == 0 && headers[i]->type == GOOMBA_SRAMSAVE) {
use_this = headers[i];
break;
}
}
free(headers);
if (use_this == NULL) sprintf(last_error, "Could not find SRAM data for %s", title);
return use_this;
}
// Uses checksum_slow, and looks at the compressed data (not the header).
// output_bytes is limited to 8 at maximum
uint64_t goomba_compressed_data_checksum(const stateheader* sh, int output_bytes) {
return checksum_slow(sh+1, F16(sh->size) - sizeof(stateheader), output_bytes);
}
int goomba_is_sram(const void* data) {
uint32_t stateid_le = F32(*(uint32_t*)data);
return stateid_le == GOOMBA_STATEID
|| stateid_le == POCKETNES_STATEID
|| stateid_le == POCKETNES_STATEID2
|| stateid_le == SMSADVANCE_STATEID;
}
/**
* Returns the 32-bit checksum (unsigned) in the configdata header, or -1 if
* an error occurred.
*/
int64_t goomba_get_configdata_checksum_field(const void* gba_data) {
const stateheader* sh = stateheader_first(gba_data);
while (sh && stateheader_plausible(sh)) {
if (F16(sh->type) == GOOMBA_CONFIGSAVE) {
// found configdata
const configdata* cd = (configdata*)sh;
if (F16(cd->size) == sizeof(goomba_configdata)) {
const goomba_configdata* gcd = (const goomba_configdata*)cd;
return F32(gcd->sram_checksum); // 0 = clean, postitive = unclean
} else if (F16(cd->size) == sizeof(smsadvance_configdata)) {
const smsadvance_configdata* scd = (const smsadvance_configdata*)cd;
return F32(scd->sram_checksum); // 0 = clean, postitive = unclean
} else {
goomba_error("This is not a recognized type of configheader (by cd->size).");
return -1;
}
}
sh = stateheader_advance(sh);
}
goomba_error("Unknown error (no configdata?)");
return -1;
}
char* goomba_cleanup(const void* gba_data_param) {
char gba_data[GOOMBA_COLOR_SRAM_SIZE]; // on stack - do not need to free
memcpy(gba_data, gba_data_param, GOOMBA_COLOR_SRAM_SIZE);
const stateheader** headers = stateheader_scan(gba_data);
if (headers == NULL) return NULL;
int i, j;
for (i = 0; headers[i] != NULL; i++) {
if (F16(headers[i]->type) == GOOMBA_CONFIGSAVE) {
// found configdata
configdata* cd = (configdata*)headers[i];
uint32_t checksum = 0;
goomba_configdata* gcd = NULL;
smsadvance_configdata* scd = NULL;
if (cd->size == sizeof(goomba_configdata)) {
gcd = (goomba_configdata*)cd;
checksum = F32(gcd->sram_checksum); // 0 = clean, postitive = unclean
} else if (cd->size == sizeof(smsadvance_configdata)) {
scd = (smsadvance_configdata*)cd;
checksum = F32(scd->sram_checksum); // 0 = clean, postitive = unclean
}
for (j = 0; headers[j] != NULL; j++) {
const stateheader* sh = headers[j];
if (F16(sh->type) == GOOMBA_SRAMSAVE && F32(sh->checksum) == checksum) {
// found stateheader
free(headers); // so make sure we return something before the loop goes around again!!
if (gcd) gcd->sram_checksum = 0; // because we do this here, goomba_new_sav should not complain about an unclean file
if (scd) scd->sram_checksum = 0;
char gbc_data[GOOMBA_COLOR_SRAM_SIZE - GOOMBA_COLOR_AVAILABLE_SIZE];
memcpy(gbc_data,
gba_data + GOOMBA_COLOR_AVAILABLE_SIZE,
sizeof(gbc_data)); // Extract GBC data at 0xe000 to an array
char* new_gba_data = goomba_new_sav(gba_data, sh, gbc_data, sizeof(gbc_data));
if (new_gba_data != NULL) memset(new_gba_data + GOOMBA_COLOR_AVAILABLE_SIZE, 0, sizeof(gbc_data));
return new_gba_data;
}
}
}
}
free(headers);
return (char*)gba_data_param;
}
void* goomba_extract(const void* gba_data, const stateheader* header_ptr, goomba_size_t* size_output) {
const stateheader* sh = (const stateheader*)header_ptr;
if (F16(sh->type) != GOOMBA_SRAMSAVE) {
goomba_error("Error: this program can only extract SRAM data.\n");
return NULL;
}
const int64_t ck = goomba_get_configdata_checksum_field(gba_data);
if (ck < 0) {
return NULL;
} else if (ck == F32(sh->checksum)) {
goomba_error("File is unclean - run goomba_cleanup before trying to extract SRAM, or you might get old data\n");
return NULL;
} else if (ck != 0) {
fprintf(stderr, "File is unclean, but it shouldn't affect retrieval of the data you asked for\n");
}
lzo_uint compressed_size = F16(sh->size) - sizeof(stateheader);
lzo_uint output_size = 32768;
const unsigned char* compressed_data = (unsigned char*)header_ptr + sizeof(stateheader);
unsigned char* uncompressed_data = (unsigned char*)malloc(output_size);
int r = lzo1x_decompress_safe(compressed_data, compressed_size,
uncompressed_data, &output_size,
(void*)NULL);
//fprintf(stderr, "Actual uncompressed size: %lu\n", output_size);
if (r == LZO_E_INPUT_NOT_CONSUMED) {
//goomba_error("Warning: input not fully used. Double-check the result to make sure it works.\n");
} else if (r < 0) {
goomba_error("Cannot decompress data (lzoconf.h error code %d).\n", r);
free(uncompressed_data);
return NULL;
}
*size_output = output_size;
return uncompressed_data;
}
goomba_size_t copy_until_invalid_header(void* dest, const stateheader* src_param) {
const void* src = src_param;
goomba_size_t bytes_copied = 0;
while (1) {
const stateheader* sh = (const stateheader*)src;
if (!stateheader_plausible(sh)) break;
memcpy(dest, src, F16(sh->size));
src = (char*)src + F16(sh->size);
dest = (char*)dest + F16(sh->size);
bytes_copied += F16(sh->size);
}
memcpy(dest, src, sizeof(stateheader)); // copy "footer"
return bytes_copied + sizeof(stateheader);
}
char* goomba_new_sav(const void* gba_data, const void* gba_header, const void* gbc_sram, goomba_size_t gbc_length) {
unsigned char* gba_header_ptr = (unsigned char*)gba_header;
stateheader* sh = (stateheader*)gba_header_ptr;
int64_t ck = goomba_get_configdata_checksum_field(gba_data);
if (ck < 0) {
return NULL;
} else if (ck == F32(sh->checksum)) {
// have to clean file
goomba_error("File is unclean - run goomba_cleanup before trying to replace SRAM, or your new data might get overwritten");
return NULL;
} else if (ck != 0) {
fprintf(stderr, "File is unclean, but it shouldn't affect replacement of the data you asked for\n");
}
if (F16(sh->type) != GOOMBA_SRAMSAVE) {
goomba_error("Error - This program cannot replace non-SRAM data.\n");
return NULL;
}
// sh->uncompressed_size is valid for Goomba Color.
// For Goomba, it's actually compressed size (and will be less than sh->size).
goomba_size_t uncompressed_size;
if (F16(sh->size) > F32(sh->uncompressed_size)) {
// Uncompress to a temporary location, just so we can see how big it is
goomba_size_t output;
void* dump = goomba_extract(gba_data, sh, &output);
if (dump == NULL) {
return NULL;
}
free(dump);
uncompressed_size = output;
} else {
// Goomba Color header - use size from there
uncompressed_size = F32(sh->uncompressed_size);
}
if (gbc_length == 0) {
// Remove data instead of replacing it
uncompressed_size = 0;
} else if (gbc_length < uncompressed_size) {
goomba_error("Error: the length of the GBC data (%u) is too short - expected %u bytes.\n",
gbc_length, uncompressed_size);
return NULL;
} else if (gbc_length - 4 == uncompressed_size) {
goomba_error("Note: RTC data (TGB_Dual format) will not be copied\n");
} else if (gbc_length - 44 == uncompressed_size) {
goomba_error("Note: RTC data (old VBA format) will not be copied\n");
} else if (gbc_length - 48 == uncompressed_size) {
goomba_error("Note: RTC data (new VBA format) will not be copied\n");
} else if (gbc_length > uncompressed_size) {
goomba_error("Warning: unknown data at end of GBC save file - only first %u bytes will be used\n", uncompressed_size);
}
if (F16(sh->type) != GOOMBA_SRAMSAVE) {
goomba_error("The data at gba_header is not SRAM data.\n");
return NULL;
}
char* const goomba_new_sav = (char*)malloc(GOOMBA_COLOR_SRAM_SIZE);
memset(goomba_new_sav, 0, GOOMBA_COLOR_SRAM_SIZE);
char* working = goomba_new_sav; // will be incremented throughout
goomba_size_t before_header = (char*)gba_header - (char*)gba_data;
// copy anything before stateheader
memcpy(goomba_new_sav, gba_data, before_header);
working += before_header;
// copy stateheader
memcpy(working, sh, sizeof(stateheader));
stateheader* new_sh = (stateheader*)working;
working += sizeof(stateheader);
// backup data that comes after this header
unsigned char* backup = (unsigned char*)malloc(GOOMBA_COLOR_SRAM_SIZE);
goomba_size_t backup_len = copy_until_invalid_header(backup, (stateheader*)(gba_header_ptr + F16(sh->size)));
// compress gbc sram
if (uncompressed_size == 0) {
// never mind about that header
working -= sizeof(stateheader);
memset(working, 0, sizeof(stateheader));
} else {
lzo_uint compressed_size;
unsigned char* dest = (unsigned char*)working;
void* wrkmem = malloc(LZO1X_1_MEM_COMPRESS);
lzo1x_1_compress((const unsigned char*)gbc_sram, uncompressed_size,
dest, &compressed_size,
wrkmem);
free(wrkmem);
working += compressed_size;
//fprintf(stderr, "Compressed %u bytes (compressed size: %lu)\n", uncompressed_size, compressed_size);
if (F16(sh->size) > F32(sh->uncompressed_size)) {
// Goomba header (not Goomba Color)
new_sh->uncompressed_size = F32(compressed_size);
}
new_sh->size = F16((uint16_t)(compressed_size + sizeof(stateheader)));
// pad to 4 bytes!
// if I don't do this, goomba color might not load the palette settings, or seemingly 'forget' them later
// btw, the settings are stored in the configdata struct defined in goombasav.h
uint16_t s = F16(new_sh->size);
while (s % 4 != 0) {
*working = 0;
working++;
s++;
}
new_sh->size = F16(s);
}
goomba_size_t used = working - goomba_new_sav;
if (used + backup_len > GOOMBA_COLOR_AVAILABLE_SIZE) {
goomba_error("Not enough room in file for the new save data (0xe000-0xffff must be kept free, I think)\n");
free(backup);
free(goomba_new_sav);
return NULL;
}
// restore the backup - just assume we have enough space
memcpy(working, backup, backup_len);
free(backup);
// restore data from 0xe000 to 0xffff
memcpy(goomba_new_sav + GOOMBA_COLOR_AVAILABLE_SIZE,
(char*)gba_data + GOOMBA_COLOR_AVAILABLE_SIZE,
GOOMBA_COLOR_SRAM_SIZE - GOOMBA_COLOR_AVAILABLE_SIZE);
return goomba_new_sav;
}

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/* goombasav.h - functions to handle Goomba / Goomba Color SRAM
Copyright (C) 2014-2017 libertyernie
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
https://github.com/libertyernie/goombasav
When compiling in Visual Studio, set all goombasav files to compile
as C++ code (Properties -> C/C++ -> Advanced -> Compile As.)
*/
#ifndef __GOOMBASAV_H
#define __GOOMBASAV_H
#include <stdint.h>
#define GOOMBA_COLOR_SRAM_SIZE 65536
#define GOOMBA_COLOR_AVAILABLE_SIZE 57344
#define GOOMBA_STATEID 0x57a731dc
#define POCKETNES_STATEID 0x57a731d7
#define POCKETNES_STATEID2 0x57a731d8
#define SMSADVANCE_STATEID 0x57a731dc
#define GOOMBA_STATESAVE 0
#define GOOMBA_SRAMSAVE 1
#define GOOMBA_CONFIGSAVE 2
#define GOOMBA_PALETTE 5
#ifdef __cplusplus
extern "C" {
#endif
typedef uint32_t goomba_size_t; // want a consistent size for printf. This is an alias for uint32_t, but this makes it clear that we're counting the size of something.
/* 16-bit and 32-bit values in the stateheader are stored as little endian
(native to the GBA's ARM chip as well as x86 processors.) Use this function
after getting or before setting a value if your code might run on a big-endian
processor (e.g. PowerPC.) */
uint16_t little_endian_conv_16(uint16_t value);
/* 16-bit and 32-bit values in the stateheader are stored as little endian
(native to the GBA's ARM chip as well as x86 processors.) Use this function
after getting or before setting a value if your code might run on a big-endian
processor (e.g. PowerPC.) */
uint32_t little_endian_conv_32(uint32_t value);
typedef struct {
uint16_t size;
uint16_t type; //=CONFIGSAVE
} configdata;
typedef struct {
uint16_t size; //=48 (0x30)
uint16_t type; //=CONFIGSAVE
char bordercolor;
char palettebank;
char misc;
char reserved3;
uint32_t sram_checksum; //checksum of rom using SRAM e000-ffff
uint32_t zero; //=0
char reserved4[32]; //="CFG"
} goomba_configdata;
typedef struct {
uint16_t size; //=48 (0x30)
uint16_t type; //=CONFIGSAVE
char displaytype;
char misc;
char reserved2;
char reserved3;
uint32_t sram_checksum; //checksum of rom using SRAM e000-ffff
uint32_t zero; //=0
char reserved4[32]; //="CFG"
} pocketnes_configdata;
typedef struct {
uint16_t size; //=52 (0x34)
uint16_t type; //=CONFIGSAVE
char displaytype;
char gammavalue;
char region; // bit 0 & 1 = region.
char sleepflick;
char config;
char bcolor;
char reserved1;
char reserved2;
uint32_t sram_checksum; //checksum of rom using SRAM e000-ffff
uint32_t zero; //=0
char reserved3[32]; //="CFG"
} smsadvance_configdata;
typedef struct {
uint16_t size; //header+data
uint16_t type; //=STATESAVE or SRAMSAVE
uint32_t uncompressed_size;
uint32_t framecount;
uint32_t checksum;
char title[32];
} stateheader;
typedef struct {
const char* sleep;
const char* autoload_state;
const char* gamma;
} configdata_misc_strings;
/**
* Returns the last error encountered by goombasav (for functions that return
* NULL on error.) This string is stored statically by goombasav and its
* contents may change over time.
*/
const char* goomba_last_error();
/**
* Set the string buffer used by goomba_last_error to a custom value. If the
* input string is too long, the resulting goomba_last_error string will be
* truncated.
* Returns the number of bytes copied to the buffer (at present, the maximum
* is 255.)
*/
size_t goomba_set_last_error(const char* msg);
/**
* Gets a struct containing pointers to three static strings (which do not
* need to be deallocated.)
*/
configdata_misc_strings configdata_get_misc(char misc);
/**
* Returns a multi-line description string that includes all parameters of the
* given stateheader or configdata structure.
* This string is stored in a static character buffer, and subsequent calls to
* stateheader_str or stateheader_summary_str will overwrite this buffer.
*/
const char* stateheader_str(const stateheader* sh);
/**
* Returns a one-line summary string displaying the size and title of the
* stateheader or configdata structure.
* This string is stored in a static character buffer, and subsequent calls to
* stateheader_str or stateheader_summary_str will overwrite this buffer.
*/
const char* stateheader_summary_str(const stateheader* sh);
int stateheader_plausible(const void* sh);
/**
* When given a pointer to a stateheader, returns a pointer to where the next
* stateheader will be located (if any). Use stateheader_plausible to
* determine if there really is a header at this location.
*
* If stateheader_plausible determines that the input is not a valid
* stateheader, NULL will be returned.
*/
stateheader* stateheader_advance(const stateheader* sh);
/**
* Scans for valid stateheaders and allocates an array to store them. The array
* will have a capacity of 64, and any difference between that
* and the number of headers found will be filled with NULL entries. The last
* entry (array[63]) is guaranteed to be NULL.
* NOTE: the gba_data parameter can point to a valid header, or to a sequence
* equal to GOOMBA_STATEID immediately before a valid header.
*/
const stateheader** stateheader_scan(const void* gba_data);
/**
* Returns the stateheader in gba_data with the title field = gbc_title,
* or NULL if there is none. Only the first 15 bytes of gbc_title will be
* used in the comparison.
*/
const stateheader* stateheader_for(const void* gba_data, const char* gbc_title_ptr);
/**
* Returns true if the given data starts with GOOMBA_STATEID (little endian.)
*/
int goomba_is_sram(const void* data);
/**
* Returns the 32-bit checksum (unsigned) in the configdata header, or -1 if
* an error occurred.
*/
int64_t goomba_get_configdata_checksum_field(const void* gba_data);
/**
* Computes a simple additive checksum of the compressed data that comes after
* the given header, using anywhere from 1 to 8 bytes.
*/
uint64_t goomba_compressed_data_checksum(const stateheader* sh, int output_bytes);
/**
* If there is save data in 0xe000-0xffff (as signaled by the configdata),
* this function compresses it to where it's supposed to go. In the event that
* the data passed in is already clean, the same pointer will be returned.
* NULL will be returned if an error occurs.
*
* The given pointer must be at least GOOMBA_COLOR_SRAM_SIZE bytes in length.
* If it is longer, any information after GOOMBA_COLOR_SRAM_SIZE bytes will be
* ignored.
*/
char* goomba_cleanup(const void* gba_data_param);
/**
* Allocates memory to store the uncompressed GB/GBC save file extracted from
* the Goomba Color save file stored in header_ptr, or returns NULL if the
* decompression failed.
*/
void* goomba_extract(const void* gba_data, const stateheader* header_ptr, goomba_size_t* size_output);
/**
* Copies data from gba_data to a new buffer allocated with malloc, replacing
* the data of the section pointed to by gba_header with a compressed version
* of the data pointed to by gbc_sram. If gbc_length is 0, the section pointed
* to by gba_header will be removed instead of replaced.
*/
char* goomba_new_sav(const void* gba_data, const void* gba_header, const void* gbc_sram, goomba_size_t gbc_length);
#ifdef __cplusplus
}
#endif
#endif

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
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you have. You must make sure that they, too, receive or can get the
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rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
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Finally, any free program is threatened constantly by software
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
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that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
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the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
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is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
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conspicuously and appropriately publish on each copy an appropriate
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notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
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You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
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notice that there is no warranty (or else, saying that you provide
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These requirements apply to the modified work as a whole. If
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Thus, it is not the intent of this section to claim rights or contest
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In addition, mere aggregation of another work not based on the Program
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except as expressly provided under this License. Any attempt
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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============================================================================
miniLZO -- mini subset of the LZO real-time data compression library
============================================================================
Author : Markus Franz Xaver Johannes Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
Version : 2.09
Date : 04 Feb 2015
I've created miniLZO for projects where it is inconvenient to
include (or require) the full LZO source code just because you
want to add a little bit of data compression to your application.
miniLZO implements the LZO1X-1 compressor and both the standard and
safe LZO1X decompressor. Apart from fast compression it also useful
for situations where you want to use pre-compressed data files (which
must have been compressed with LZO1X-999).
miniLZO consists of one C source file and three header files:
minilzo.c
minilzo.h, lzoconf.h, lzodefs.h
To use miniLZO just copy these files into your source directory, add
minilzo.c to your Makefile and #include minilzo.h from your program.
Note: you also must distribute this file ('README.LZO') with your project.
minilzo.o compiles to about 6 KiB (using gcc or Visual C on an i386), and
the sources are about 30 KiB when packed with zip - so there's no more
excuse that your application doesn't support data compression :-)
For more information, documentation, example programs and other support
files (like Makefiles and build scripts) please download the full LZO
package from
http://www.oberhumer.com/opensource/lzo/
Have fun,
Markus
P.S. minilzo.c is generated automatically from the LZO sources and
therefore functionality is completely identical
Appendix A: building miniLZO
----------------------------
miniLZO is written such a way that it should compile and run
out-of-the-box on most machines.
If you are running on a very unusual architecture and lzo_init() fails then
you should first recompile with '-DLZO_DEBUG' to see what causes the failure.
The most probable case is something like 'sizeof(void *) != sizeof(size_t)'.
After identifying the problem you can compile by adding some defines
like '-DSIZEOF_VOID_P=8' to your Makefile.
The best solution is (of course) using Autoconf - if your project uses
Autoconf anyway just add '-DMINILZO_HAVE_CONFIG_H' to your compiler
flags when compiling minilzo.c. See the LZO distribution for an example
how to set up configure.ac.
Appendix B: list of public functions available in miniLZO
---------------------------------------------------------
Library initialization
lzo_init()
Compression
lzo1x_1_compress()
Decompression
lzo1x_decompress()
lzo1x_decompress_safe()
Checksum functions
lzo_adler32()
Version functions
lzo_version()
lzo_version_string()
lzo_version_date()
Portable (but slow) string functions
lzo_memcmp()
lzo_memcpy()
lzo_memmove()
lzo_memset()
Appendix C: suggested macros for 'configure.ac' when using Autoconf
-------------------------------------------------------------------
Checks for typedefs and structures
AC_CHECK_TYPE(ptrdiff_t,long)
AC_TYPE_SIZE_T
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(__int64)
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(size_t)
AC_CHECK_SIZEOF(ptrdiff_t)
Checks for compiler characteristics
AC_C_CONST
Checks for library functions
AC_CHECK_FUNCS(memcmp memcpy memmove memset)
Appendix D: Copyright
---------------------
LZO and miniLZO are Copyright (C) 1996-2015 Markus Franz Xaver Oberhumer
All Rights Reserved.
LZO and miniLZO are distributed under the terms of the GNU General
Public License (GPL). See the file COPYING.
Special licenses for commercial and other applications which
are not willing to accept the GNU General Public License
are available by contacting the author.

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/* minilzo.h -- mini subset of the LZO real-time data compression library
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/*
* NOTE:
* the full LZO package can be found at
* http://www.oberhumer.com/opensource/lzo/
*/
#ifndef __MINILZO_H_INCLUDED
#define __MINILZO_H_INCLUDED 1
#define MINILZO_VERSION 0x2090
#if defined(__LZOCONF_H_INCLUDED)
# error "you cannot use both LZO and miniLZO"
#endif
/* internal Autoconf configuration file - only used when building miniLZO */
#ifdef MINILZO_HAVE_CONFIG_H
# include <config.h>
#endif
#include <limits.h>
#include <stddef.h>
#ifndef __LZODEFS_H_INCLUDED
#include "lzodefs.h"
#endif
#undef LZO_HAVE_CONFIG_H
#include "lzoconf.h"
#if !defined(LZO_VERSION) || (LZO_VERSION != MINILZO_VERSION)
# error "version mismatch in header files"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
//
************************************************************************/
/* Memory required for the wrkmem parameter.
* When the required size is 0, you can also pass a NULL pointer.
*/
#define LZO1X_MEM_COMPRESS LZO1X_1_MEM_COMPRESS
#define LZO1X_1_MEM_COMPRESS ((lzo_uint32_t) (16384L * lzo_sizeof_dict_t))
#define LZO1X_MEM_DECOMPRESS (0)
/* compression */
LZO_EXTERN(int)
lzo1x_1_compress ( const lzo_bytep src, lzo_uint src_len,
lzo_bytep dst, lzo_uintp dst_len,
lzo_voidp wrkmem );
/* decompression */
LZO_EXTERN(int)
lzo1x_decompress ( const lzo_bytep src, lzo_uint src_len,
lzo_bytep dst, lzo_uintp dst_len,
lzo_voidp wrkmem /* NOT USED */ );
/* safe decompression with overrun testing */
LZO_EXTERN(int)
lzo1x_decompress_safe ( const lzo_bytep src, lzo_uint src_len,
lzo_bytep dst, lzo_uintp dst_len,
lzo_voidp wrkmem /* NOT USED */ );
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/* vim:set ts=4 sw=4 et: */

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/* pocketnesrom.c - functions to find uncompressed NES ROM images
stored within PocketNES ROMs
Copyright (C) 2016 libertyernie
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
When compiling in Visual Studio, set the project to compile
as C++ code (Properties -> C/C++ -> Advanced -> Compile As.)
*/
#include <stdlib.h>
#include <string.h>
#include "pocketnesrom.h"
const char NES_WORD[4] = { 'N','E','S',0x1A };
/* Finds the first PocketNES ROM header in the given data block by looking for
the segment 4E45531A (N,E,S,^Z) in the ROM itself. If no valid data is found,
this method will return NULL. */
const pocketnes_romheader* pocketnes_first_rom(const void* data, size_t length) {
const char* ptr = (const char*)data;
const char* end = ptr + length;
int logo_pos = 0;
while (ptr < end) {
if (*ptr == NES_WORD[logo_pos]) {
// match
logo_pos++;
if (logo_pos == 4) { // matched all of GB logo - on last byte (0x133)
// check if length fits
const pocketnes_romheader* candidate = (pocketnes_romheader*)(ptr - 3 - sizeof(pocketnes_romheader));
size_t filesize = candidate->filesize;
if (*(uint16_t *)"\0\xff" < 0x100) {
uint32_t buffer;
((char*)&buffer)[0] = ((char*)&filesize)[3];
((char*)&buffer)[1] = ((char*)&filesize)[2];
((char*)&buffer)[2] = ((char*)&filesize)[1];
((char*)&buffer)[3] = ((char*)&filesize)[0];
filesize = buffer;
}
const char* candidate_end_ptr = (ptr - 3) + filesize;
if (candidate_end_ptr <= end) {
return candidate;
} else {
// no match, try again
logo_pos = 0;
}
}
}
else {
// no match, try again
if (logo_pos > 0) {
ptr -= logo_pos;
logo_pos = 0;
}
}
ptr++;
}
return NULL;
}
/* Returns a pointer to the next PocketNES ROM header in the data. If the
location where the next ROM header would be does not contain a 'N,E,S,^Z'
segment at the start of the ROM, this method will return NULL. */
const pocketnes_romheader* pocketnes_next_rom(const void* data, size_t length, const pocketnes_romheader* first_rom) {
size_t diff = (const char*)first_rom - (const char*)data;
if (diff > length) {
return NULL;
}
size_t effective_length = length - diff;
if (effective_length <= 0x200) {
// Assume there will never be a ROM this small
return NULL;
}
return pocketnes_first_rom(
(const char*)first_rom + 4 + sizeof(pocketnes_romheader),
effective_length - 4 - sizeof(pocketnes_romheader));
}
/* Returns true if the given data region looks like a PocketNES ROM header
(based on the 'N,E,S,^Z' segment), or false otherwise. */
int pocketnes_is_romheader(const void* data) {
const char* rom_ptr = (const char*)data + sizeof(pocketnes_romheader);
return memcmp(rom_ptr, NES_WORD, 4) == 0;
}
/* Returns the checksum that PocketNES would use for this ROM.
You can pass the PocketNES ROM header or the NES ROM itself. */
uint32_t pocketnes_get_checksum(const void* rom) {
const uint8_t* p = (const uint8_t*)rom;
// Checksum should not include NES ROM format header
if (memcmp(p, NES_WORD, 4) == 0) {
p += 16;
}
// TODO: add support for compressed roms
uint32_t sum = 0;
int i;
for (i = 0; i<128; i++) {
sum += *p | (*(p + 1) << 8) | (*(p + 2) << 16) | (*(p + 3) << 24);
p += 128;
}
return sum;
}

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/* pocketnesrom.h - functions to find uncompressed NES ROM images
stored within PocketNES ROMs
Copyright (C) 2016 libertyernie
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
When compiling in Visual Studio, set the project to compile
as C++ code (Properties -> C/C++ -> Advanced -> Compile As.)
*/
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
char name[32];
uint32_t filesize;
uint32_t flags;
uint32_t spritefollow;
uint32_t reserved;
} pocketnes_romheader;
/* Finds the first PocketNES ROM header in the given data block by looking for
the segment 4E45531A (N,E,S,^Z) in the ROM itself. If no valid data is found,
this method will return NULL. */
const pocketnes_romheader* pocketnes_first_rom(const void* data, size_t length);
/* Returns a pointer to the next PocketNES ROM header in the data. If the
location where the next ROM header would be does not contain a 'N,E,S,^Z'
segment at the start of the ROM, this method will return NULL. */
const pocketnes_romheader* pocketnes_next_rom(const void* data, size_t length, const pocketnes_romheader* first_rom);
/* Returns true if the given data region looks like a PocketNES ROM header
(based on the 'N,E,S,^Z' segment), or false otherwise. */
int pocketnes_is_romheader(const void* data);
/* Returns the checksum that PocketNES would use for this ROM.
You can pass the PocketNES ROM header or the NES ROM itself. */
uint32_t pocketnes_get_checksum(const void* rom);
#ifdef __cplusplus
}
#endif