Xargon/Supermodel
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Support for loading an arbitrary (non-game) CROM image.

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This commit is contained in:
Bart Trzynadlowski 2015-12-07 05:29:07 +00:00
parent 1035b0c6a8
commit 3d00225cba
1 changed files with 72 additions and 0 deletions
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72
Src/ROMLoad.cpp
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@ -30,6 +30,73 @@
#include "Supermodel.h"
#include "Pkgs/unzip.h"
static bool isPowerOfTwo(long x)
{
while (((x & 1) == 0) && x > 1) // while x is even and > 1
x >>= 1;
return (x == 1);
}
// Sega Bass Fishing
static struct GameInfo cromInfo =
{
"crom.bin",
NULL,
"Custom CROM Image",
"Bart Trzynadlowski",
2015,
0x10,
0, // size of CROM image (filled in at run time)
false, // no need to mirror anything
0, // no VROM
0, // no sample ROMs
GAME_INPUT_COMMON|GAME_INPUT_JOYSTICK1,
0, // no MPEG board
false, // no drive board
{
{ NULL, false, NULL, 0, 0, 0, 0, 0, false }
}
};
static GameInfo * LoadCROMDirect(const struct ROMMap *Map, const char *file)
{
FILE *fp = fopen(file, "rb");
if (!fp)
{
ErrorLog("Could not open '%s'.", file);
return NULL;
}
fseek(fp, 0, SEEK_END);
long fileSize = ftell(fp);
rewind(fp);
if (fileSize > 0x800000)
{
ErrorLog("CROM image exceeds 8MB.");
fclose(fp);
return NULL;
}
if (!isPowerOfTwo(fileSize))
{
ErrorLog("CROM image size is not a power of 2.");
fclose(fp);
return NULL;
}
const struct ROMMap *CROM = 0;
while (Map->region && strcmp(Map->region, "CROM"))
++Map;
if (!Map->region)
{
ErrorLog("Internal error: No CROM region in ROM map!");
fclose(fp);
return NULL;
}
// Read file into upper part of CROM region
fread(Map->ptr + 0x800000 - fileSize, sizeof(UINT8), fileSize, fp);
fclose(fp);
// Return fake game info structure
cromInfo.cromSize = fileSize;
return &cromInfo;
}
/*
* CopyRegion(dest, destOffset, destSize, src, srcSize):
@ -46,6 +113,8 @@
*/
void CopyRegion(UINT8 *dest, unsigned destOffset, unsigned destSize, UINT8 *src, unsigned srcSize)
{
if (!destSize || !srcSize)
return;
while (destOffset < destSize)
{
// If we'll overrun the destination, trim the copy length
@ -204,6 +273,9 @@ static bool LoadROM(UINT8 *buf, unsigned bufSize, const struct ROMMap *Map, cons
*/
const struct GameInfo * LoadROMSetFromZIPFile(const struct ROMMap *Map, const struct GameInfo *GameList, const char *zipFile, bool loadAll)
{
if (!strcmp(zipFile, "crom.bin"))
return LoadCROMDirect(Map, zipFile);
unzFile zf, zfp = NULL;
unz_file_info fileInfo;
const struct GameInfo *Game = NULL;