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NINTV-DS/arm9/source/emucore/Rip.cpp

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// =====================================================================================
// Copyright (c) 2021-2024 Dave Bernazzani (wavemotion-dave)
//
// Copying and distribution of this emulator, its source code and associated
// readme files, with or without modification, are permitted in any medium without
// royalty provided the this copyright notice is used and wavemotion-dave (NINTV-DS)
// and Kyle Davis (BLISS) are thanked profusely.
//
// The NINTV-DS emulator is offered as-is, without any warranty.
// =====================================================================================
#include <stdlib.h>
#include <stdio.h>
#include "Rip.h"
#include "RAM.h"
#include "ROM.h"
#include "ROMBanker.h"
#include "JLP.h"
#include "Memory.h"
#include "CRC32.h"
#include "../database.h"
#include "../nintv-ds.h"
#include "../loadgame.h"
#include "../config.h"
#define ROM_TAG_TITLE 0x01
#define ROM_TAG_PUBLISHER 0x02
#define ROM_TAG_RELEASE_DATE 0x05
#define ROM_TAG_COMPATIBILITY 0x06
UINT8 tag_compatibility[8] = {0};
UINT8 bGenericLoad = false;
extern UINT8 *bin_image_buf;
extern UINT16 *bin_image_buf16;
/* ======================================================================== */
/* CRC16_TBL -- Lookup table used for the CRC-16 code. */
/* ======================================================================== */
const uint16_t crc16_tbl[256] =
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};
/* ======================================================================== */
/* CRC16_UPDATE -- Updates a 16-bit CRC using the lookup table above. */
/* Note: The 16-bit CRC is set up as a left-shifting */
/* CRC with no inversions. */
/* ======================================================================== */
uint16_t crc16_update(uint16_t crc, uint8_t data)
{
return (crc << 8) ^ crc16_tbl[(crc >> 8) ^ data];
}
Rip::Rip(UINT32 systemID)
: Peripheral("", ""),
peripheralCount(0),
targetSystemID(systemID),
crc(0)
{
memset(filename, 0, sizeof(filename));
memset(overlayname, 0, sizeof(overlayname));
JLP16Bit = NULL;
}
Rip::~Rip()
{
UINT16 count = GetROMCount();
for (UINT16 i = 0; i < count; i++)
delete GetROM(i);
if (JLP16Bit) delete JLP16Bit;
}
void Rip::SetName(const CHAR* n)
{
strcpy(peripheralName, n);
}
void Rip::AddPeripheralUsage(const CHAR* periphName, PeripheralCompatibility usage)
{
strcpy(peripheralNames[peripheralCount], periphName);
peripheralUsages[peripheralCount] = usage;
peripheralCount++;
}
PeripheralCompatibility Rip::GetPeripheralUsage(const CHAR* periphName)
{
for (UINT16 i = 0; i < peripheralCount; i++) {
if (strcmpi(peripheralNames[i], periphName) == 0)
return peripheralUsages[i];
}
return PERIPH_INCOMPATIBLE;
}
void ForceLoadOptions(UINT32 crc)
{
// --------------------------------------------------------------------
// If the user has picked some load options, we want to save those out
// --------------------------------------------------------------------
if ((load_options != 0x00) && (load_options != myConfig.load_options))
{
myConfig.load_options = (load_options == LOAD_NORMALLY ? 0x00: load_options);
dsPrintValue(2,23,0, (char*)" SAVING CONFIGURATION ");
SaveConfig(crc, FALSE);
WAITVBL;WAITVBL;WAITVBL;
dsPrintValue(2,23,0, (char*)" ");
}
// If the user has overridden the load options for this game, use those instead...
if (myConfig.load_options)
{
// For TUTORVISION, don't override any of the values that were found in the .bin/.cfg or .rom
if ((myConfig.load_options & LOAD_WITH_TUTORVISION) != LOAD_WITH_TUTORVISION)
{
bUseECS = 0;
bUseJLP = 0;
bUseIVoice = 0;
}
bUseTutorvision = 0;
if ((myConfig.load_options & LOAD_WITH_JLP) == LOAD_WITH_JLP) bUseJLP = 1;
if ((myConfig.load_options & LOAD_WITH_ECS) == LOAD_WITH_ECS) bUseECS = 1;
if ((myConfig.load_options & LOAD_WITH_IVOICE) == LOAD_WITH_IVOICE) bUseIVoice = 1;
if ((myConfig.load_options & LOAD_WITH_TUTORVISION) == LOAD_WITH_TUTORVISION) {bUseTutorvision = 1; bUseECS = 0; myConfig.gramSize = GRAM_2K;} // Force 2K GRAM but don't force the save above
}
}
char cfgFilename[MAX_PATH];
Rip* Rip::LoadBin(const CHAR* filename)
{
// Create the path to the .cfg file (which may or may not exist...)
strcpy(cfgFilename, filename);
cfgFilename[strlen(cfgFilename)-4] = 0;
strcat(cfgFilename, ".cfg");
// Open the binary file - we will read it all in...
FILE* file = fopen(filename, "rb");
if (file == NULL)
{
FatalError("BIN FILE DOES NOT EXIST");
return NULL;
}
//obtain the file size
fseek(file, 0, SEEK_END);
size_t size = ftell(file);
rewind(file);
if (size >= MAX_ROM_FILE_SIZE)
{
fclose(file);
FatalError("BIN FILE TOO LARGE");
return NULL;
}
// Read the file into our memory buffer - we can process it from there...
fread(bin_image_buf, size, 1, file);
fclose(file);
//determine the crc of the designated file
UINT32 crc = CRC32::getCrc(bin_image_buf, size);
// ----------------------------------------------------------------
// Now go and try and load all the memory regions based on either
// the internal database table or the .cfg file if it exists...
// ----------------------------------------------------------------
Rip* rip = LoadBinCfg(cfgFilename, crc, size);
if (rip == NULL)
{
FatalError("UNABLE TO CREATE RIP");
return NULL;
}
//parse the file bin_image_buf[] into the rip
UINT32 offset = 0;
UINT16 romCount = rip->GetROMCount();
for (UINT16 i = 0; i < romCount; i++)
{
if (offset >= size)
{
if (bGenericLoad) continue; // If we are using the generic loader, it's okay to be undersized...
// -------------------------------------------------------------------------------
// Something is wrong, the file we're trying to load isn't large enough getting
// here indicates a likely incorrect memory map in the database or the .cfg file
// -------------------------------------------------------------------------------
delete rip;
FatalError("BAD MEMORY MAP");
return NULL;
}
ROM* nextRom = rip->GetROM(i);
nextRom->load(bin_image_buf+offset);
offset += nextRom->getByteWidth() * nextRom->getReadSize();
}
// Save some basic info which we need if we end up force-loading options
rip->SetFileName(filename);
rip->crc = CRC32::getCrc(filename);
rip->mySize = size;
// --------------------------------------------------------------
// If the user asked for a specific combination of hardware...
// --------------------------------------------------------------
ForceLoadOptions(rip->crc);
// Add the JLP RAM module if required...
if (bUseJLP)
{
rip->JLP16Bit = new JLP();
rip->AddRAM(rip->JLP16Bit);
}
else
{
rip->JLP16Bit = NULL;
}
// Add the Intellivoice if required...
if (bUseIVoice) rip->AddPeripheralUsage("Intellivoice", (bUseIVoice == 3) ? PERIPH_OPTIONAL:PERIPH_REQUIRED);
// Add the ECS module if required...
if (bUseECS) rip->AddPeripheralUsage("ECS", (bUseECS == 3) ? PERIPH_OPTIONAL:PERIPH_REQUIRED);
return rip;
}
// Check if a file exists... return 1 if exists, return 0 if it does not exist...
static u8 exists(const CHAR *filename)
{
FILE *file;
if (file = fopen(filename, "r"))
{
fclose(file);
return 1;
}
return 0;
}
u16 maybeRAM_start[16];
u16 maybeRAM_end[16];
u8 maybeRAMidx = 0;
Rip* Rip::LoadBinCfg(const CHAR* configFile, UINT32 crc, size_t size)
{
Rip* rip = NULL;
const struct Database_t *db_entry = FindDatabaseEntry(crc); // Try to find the CRC in our internal database...
bGenericLoad = false;
// If we didn't find a game in the database and no .cfg exists but the .bin is 16K or less, we can assume it will load at 0x5000
if ((db_entry == NULL) && !exists(configFile) && (size <= 16384))
{
db_entry = &database[0]; // Generic loader at 5000h for games up to 16K in size (fairly common)
bGenericLoad = true;
}
// If we found a game entry and we are not DSi, we check the frame skip setting
if ((db_entry != NULL) && (bConfigWasFound == FALSE) && !isDSiMode())
{
myConfig.frame_skip = ((db_entry->bDSliteNoFrameSkip & 1) ? 0:1);
}
// If we found a game entry and we are not DSi, we see if we can bump the sound quality
if ((db_entry != NULL) && !isDSiMode())
{
if (db_entry->bDSliteNoFrameSkip & 2)
{
if (myConfig.sound_quality == 0) myConfig.sound_quality = 1; // boost from GOOD to GREAT
}
ApplyOptions();
}
maybeRAMidx = 0;
if (db_entry != NULL) // We found an entry... let's go!
{
rip = new Rip(ID_SYSTEM_INTELLIVISION);
rip->JLP16Bit = NULL;
rip->SetName(db_entry->name);
for (UINT8 i=0; i<MAX_MEM_AREAS; i++)
{
switch (db_entry->mem_areas[i].mem_type)
{
case DB_ROM8:
{
rip->AddROM(new ROM("Cartridge ROM", "", 0, sizeof(UINT8), db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr));
break;
}
case DB_ROM16:
{
rip->AddROM(new ROM("Cartridge ROM", "", 0, sizeof(UINT16), db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr));
break;
}
case DB_R16B0:
{
ROM *bankedROM = new ROM("Cartridge ROM", "", 0, sizeof(UINT16), db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr);
bankedROM->SetEnabled(true);
rip->AddROM(bankedROM);
rip->AddRAM(new ROMBanker(bankedROM, db_entry->mem_areas[i].mem_addr+0xFFF, 0xFFF0, db_entry->mem_areas[i].mem_addr+0xA50, 0x000F, 0));
break;
}
case DB_R16B1:
{
ROM *bankedROM = new ROM("Cartridge ROM", "", 0, sizeof(UINT16), db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr);
bankedROM->SetEnabled(false);
rip->AddROM(bankedROM);
rip->AddRAM(new ROMBanker(bankedROM, db_entry->mem_areas[i].mem_addr+0xFFF, 0xFFF0, db_entry->mem_areas[i].mem_addr+0xA50, 0x000F, 1));
break;
}
case DB_RAM8:
{
rip->AddRAM(new RAM(db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr, 0xFFFF, 0xFFFF, 8));
break;
}
case DB_RAM16:
{
rip->AddRAM(new RAM(db_entry->mem_areas[i].mem_size, db_entry->mem_areas[i].mem_addr, 0xFFFF, 0xFFFF, 16));
break;
}
default:
break;
}
}
// Now add the required peripherals...
if (db_entry->bIntellivoice)
{
bUseIVoice = db_entry->bIntellivoice;
}
if (db_entry->bECS)
{
bUseECS = db_entry->bECS;
}
if (db_entry->bJLP)
{
bUseJLP = db_entry->bJLP;
}
}
else // Didn't find it... let's see if we can read a .cfg file
{
FILE* cfgFile = fopen(configFile, "r");
if (cfgFile != NULL)
{
rip = new Rip(ID_SYSTEM_INTELLIVISION);
rip->JLP16Bit = NULL;
CHAR nextLine[128];
int cfg_mode=0;
while (!feof(cfgFile))
{
if (fgets(nextLine, 127, cfgFile) != NULL)
{
if (strstr(nextLine, "[mapping]") != NULL) cfg_mode = 1;
else if (strstr(nextLine, "[memattr]") != NULL) cfg_mode = 2;
else if (strstr(nextLine, "[vars]") != NULL) cfg_mode = 3;
else
{
char *ptr = nextLine;
while ((*ptr == ' ') || (*ptr == '\t')) ptr++;
if (cfg_mode == 1) // [mapping] Mode
{
if (*ptr == '$')
{
ptr++;
UINT32 start_addr = strtoul(ptr, &ptr, 16);
while (*ptr == ' ' || *ptr == '\t' || *ptr == '-' || *ptr == '$') ptr++;
UINT32 end_addr = strtoul(ptr, &ptr, 16);
while (*ptr == ' ' || *ptr == '\t' || *ptr == '=' || *ptr == '$') ptr++;
UINT16 map_addr = strtoul(ptr, &ptr, 16);
ROM *newROM = new ROM("Cartridge ROM", "", 0, sizeof(UINT16), (UINT16)((end_addr-start_addr) + 1), map_addr);
while (*ptr == ' ' || *ptr == '\t' || *ptr == '=' || *ptr == '$') ptr++;
if (strstr(ptr, "PAGE") != NULL)
{
ptr+=5;
UINT16 page = (UINT16)strtoul(ptr, &ptr, 16) & 0xf;
if (page == 0) newROM->SetEnabled(true); else newROM->SetEnabled(false);
rip->AddROM(newROM);
rip->AddRAM(new ROMBanker(newROM, (map_addr&0xF000)+0xFFF, 0xFFF0, (map_addr&0xF000)+0xA50, 0x000F, page));
}
else rip->AddROM(newROM);
}
}
if (cfg_mode == 2) // [memattr] Mode
{
if (*ptr == '$')
{
ptr++;
UINT16 start_addr = strtoul(ptr, &ptr, 16);
while (*ptr == ' ' || *ptr == '\t' || *ptr == '-' || *ptr == '$') ptr++;
UINT16 end_addr = strtoul(ptr, &ptr, 16);
if (strstr(ptr, "RAM 8") != NULL)
{
rip->AddRAM(new RAM((UINT16)((end_addr-start_addr) + 1), start_addr, 0xFFFF, 0xFFFF, 8));
}
else if (strstr(ptr, "RAM 16") != NULL)
{
if ((start_addr >= 0x8000) && (start_addr <= 0x9FFF))
{
maybeRAM_start[maybeRAMidx] = start_addr;
maybeRAM_end[maybeRAMidx] = end_addr;
maybeRAMidx++;
}
else
{
rip->AddRAM(new RAM((UINT16)((end_addr-start_addr) + 1), start_addr, 0xFFFF, 0xFFFF, 16));
}
}
}
}
if (cfg_mode == 3) // [vars] Mode
{
if (strstr(ptr, "jlp") || strstr(ptr, "jlp_accel") || strstr(ptr, "jlp_flash"))
{
// If we haven't already enabled JLP, see if this config entry turns it on...
if (bUseJLP == 0)
{
u8 zeros = 0;
u8 nonzeros = 0;
for (int i=0; i<strlen(ptr); i++)
{
if (ptr[i] == '0') zeros++;
else if ((ptr[i] >= '1') && (ptr[i] <= '9')) nonzeros++;
}
bUseJLP = ((zeros == 1) && (nonzeros == 0)) ? 0:1; // If the line was "= 0", we keep JLP disabled
}
}
if (strstr(ptr, "voice"))
{
bUseIVoice = 1;
}
if (strstr(ptr, "ecs"))
{
if (strstr(ptr, "0")) bUseECS = 0;
else bUseECS = (isDSiMode() ? 1 : 0); // For the DS-Lite/Phat, we ignore this directive that is so often set even when there is no advantage to using it (and it chews up CPU). User can still override.
}
}
// ------------------------------------------------------------------------
// Make sure we haven't exceeded the maximum number of mapped ROM segments
// ------------------------------------------------------------------------
if (rip->GetRAMCount() >= MAX_RAM_ROM_SEGMENTS) break;
if (rip->GetROMCount() >= MAX_RAM_ROM_SEGMENTS) break;
}
}
}
fclose(cfgFile);
// If we were asked to have 16-bit RAM in the 8000-9FFF region and we didn't get JLP enabled (which has its own RAM mapped there), we map new RAM
if (maybeRAMidx && !bUseJLP)
{
for (u8 idx=0; idx<maybeRAMidx; idx++)
{
rip->AddRAM(new RAM((UINT16)((maybeRAM_end[idx]-maybeRAM_start[idx]) + 1), maybeRAM_start[idx], 0xFFFF, 0xFFFF, 16));
}
}
}
}
return rip;
}
Rip* Rip::LoadRom(const CHAR* filename)
{
static char tmp_buf[64];
u16 crc16;
bGenericLoad = false;
FILE* infile = fopen(filename, "rb");
if (infile == NULL)
{
FatalError("ROM FILE NOT FOUND");
return NULL;
}
//obtain the file size
fseek(infile, 0, SEEK_END);
size_t size = ftell(infile);
rewind(infile);
if (size >= MAX_ROM_FILE_SIZE)
{
fclose(infile);
FatalError("ROM FILE TOO LARGE");
return NULL;
}
//read the magic byte (should always be $A8 or $41 or $61)
int read = fgetc(infile);
if ((read != 0xA8) && (read != 0x41) && (read != 0x61))
{
fclose(infile);
FatalError("ROM MAGIC BYTE MISSING");
return NULL;
}
//read the number of ROM segments
int romSegmentCount = fgetc(infile);
read = fgetc(infile);
if ((read ^ 0xFF) != romSegmentCount)
{
FatalError("ROM SEGMENT COUNT INVALID");
fclose(infile);
return NULL;
}
memset(tag_compatibility, 0x00, sizeof(tag_compatibility));
Rip* rip = new Rip(ID_SYSTEM_INTELLIVISION);
// ----------------------------------------------------------------
// Read through the .ROM and parse out all of the rom segments...
// ----------------------------------------------------------------
int i;
for (i = 0; i < romSegmentCount; i++)
{
read = fgetc(infile);
u16 calcCrc16 = crc16_update(0xFFFF, read);
UINT16 start = (UINT16)(read << 8);
read = fgetc(infile);
calcCrc16 = crc16_update(calcCrc16, read);
UINT16 end = (UINT16)((read << 8) | 0xFF);
UINT16 size = (UINT16)((end-start)+1);
//finally, transfer the ROM image to our binary buffer
UINT16* romImage = (UINT16*)bin_image_buf16;
int j;
for (j = 0; j < size; j++)
{
int hi = fgetc(infile);
int lo = fgetc(infile);
calcCrc16 = crc16_update(calcCrc16, hi);
calcCrc16 = crc16_update(calcCrc16, lo);
int nextbyte = (hi << 8) | lo;
romImage[j] = (UINT16)nextbyte;
}
//read the CRC
crc16 = (fgetc(infile) << 8) | fgetc(infile);
// Validate the CRC to make sure this ROM segment has integrity...
if (calcCrc16 == crc16)
{
// And finally, add this rom segment to our RIP...
rip->AddROM(new ROM("Cartridge ROM", romImage, 2, size, start, 0xFFFF));
}
else
{
FatalError("ROM SEGMENT INTEGRITY FAIL");
fclose(infile);
return NULL;
}
}
// Read and parse the enable tables. This might result in some RAM being mapped...
for (i = 0; i < 50; i++)
{
int enable = fgetc(infile);
// The first 16 bytes encode into 32 4-bit nibbles each of which can specify a writable area in 2K chunks
if (i<16)
{
if (enable & 0x02) rip->AddRAM(new RAM(0x800, (i<<12) + 0x000, 0xFFFF, 0xFFFF, (enable & 0x04) ? 8:16)); // Map RAM into the lower 2K of this segment
if (enable & 0x20) rip->AddRAM(new RAM(0x800, (i<<12) + 0x800, 0xFFFF, 0xFFFF, (enable & 0x40) ? 8:16)); // Map RAM into the upper 2K of this segment
}
}
// Read through the rest of the .ROM and look for tags...
while ((read = fgetc(infile)) != -1)
{
u16 calcCrc16 = crc16_update(0xFFFF, read);
u16 length = (read & 0x3F);
read = (read & 0xC) >> 6;
for (i = 0; i < read; i++)
{
u8 read2 = fgetc(infile);
calcCrc16 = crc16_update(calcCrc16, read2);
length = (length | (read2 << ((8*i)+6)));
}
u8 type = fgetc(infile);
calcCrc16 = crc16_update(calcCrc16, type);
switch (type)
{
case ROM_TAG_TITLE:
{
for (i = 0; i < length; i++) {
read = fgetc(infile);
tmp_buf[i] = (char)read;
}
crc16 = (fgetc(infile) << 8) | fgetc(infile);
rip->SetName(tmp_buf);
}
break;
case ROM_TAG_PUBLISHER:
{
for (i = 0; i < length; i++) {
read = fgetc(infile);
tmp_buf[i] = (char)read;
}
crc16 = (fgetc(infile) << 8) | fgetc(infile);
}
break;
// 7 6 5 4 3 2 1 0
// +---+---+---+---+---+---+---+---+
// | ECS | rsvd | VOICE | KEYBD | byte 0
// +---+---+---+---+---+---+---+---+
// 00 -- Don't Care. The cartridge works with or without the peripheral. The peripheral is ignored.
// 01 -- Supports. The cartridge works with the peripheral and may provide extra functionality when used it.
// 10 -- Requires. The cartridge will not work without this particular peripheral.
// 11 -- Incompatible. The peripheral must not be used with this cartridge, because the two are not compatible.
case ROM_TAG_COMPATIBILITY:
{
read = fgetc(infile);
tag_compatibility[0] = read;
calcCrc16 = crc16_update(calcCrc16, read);
// Check for ECS Supported or Required...
if ((read & 0xC0) == 0x80) bUseECS = 1; // Required
if ((read & 0xC0) == 0x40) bUseECS = 3; // Supports
// Check for Intellivoice Supported or Required...
if ((read & 0x0C) == 0x08) bUseIVoice = 1; // Required
if ((read & 0x0C) == 0x04) bUseIVoice = 3; // Supports
for (i = 0; i < length-1; i++) // -1 because we already processed the first byte above...
{
read = fgetc(infile);
tag_compatibility[1+i] = read;
calcCrc16 = crc16_update(calcCrc16, read);
// ------------------------------------------------------------------------
// Optional Byte 4 is of interest to us as that one has JLP stuff in it
// +-----+-----+------+-----+-----+-----+-----+-----+
// | JLP Accel | LTOM | reserved | JLPF[9:8] | byte 3
// +-----+-----+------+-----+-----+-----+-----+-----+
// 00 JLP accel disabled; flash disabled (i.e. no JLP features)
// 01 JLP accel enabled, default to "on"; flash disabled
// 10 JLP accel enabled, default to "off"; flash enabled
// 11 JLP accel enabled, default to "on"; flash enabled
// ------------------------------------------------------------------------
if (i == 2) // 4th byte (first byte further above... 0,1,2 = fourth byte)
{
if ((read & 0xC0) != 0x00) bUseJLP = 1; else bUseJLP = 0;
}
}
}
break;
case ROM_TAG_RELEASE_DATE:
default:
{
for (i = 0; i < length; i++) {
fgetc(infile);
fgetc(infile);
}
fgetc(infile);
fgetc(infile);
}
break;
}
}
fclose(infile);
rip->SetFileName(filename);
rip->crc = CRC32::getCrc(filename);
rip->mySize = size;
// See if we have any special overrides for .ROM files
const struct SpecialRomDatabase_t *db_entry = FindRomDatabaseEntry(rip->crc); // Try to find the CRC in our internal database...
if (db_entry != NULL)
{
if (db_entry->bJLP) bUseJLP = db_entry->bJLP;
if (db_entry->bIntellivoice) bUseIVoice = db_entry->bIntellivoice;
if (db_entry->bECS) bUseECS = db_entry->bECS;
}
// --------------------------------------------------------------
// If the user asked for a specific combination of hardware...
// --------------------------------------------------------------
ForceLoadOptions(rip->crc);
// Load the JLP RAM module if required...
if (bUseJLP)
{
rip->JLP16Bit = new JLP();
rip->AddRAM(rip->JLP16Bit);
}
else
{
rip->JLP16Bit = NULL;
}
// Load the Intellivoice if asked for...
if (bUseIVoice) rip->AddPeripheralUsage("Intellivoice", (bUseIVoice == 3) ? PERIPH_OPTIONAL:PERIPH_REQUIRED);
// Load the ECS if asked for...
if (bUseECS) rip->AddPeripheralUsage("ECS", (bUseECS == 3) ? PERIPH_OPTIONAL:PERIPH_REQUIRED);
return rip;
}
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