static int read_rom_data(romload_private *romdata, const rom_entry *parent_region, const rom_entry *romp)
{
int datashift = ROM_GETBITSHIFT(romp);
int datamask = ((1 << ROM_GETBITWIDTH(romp)) - 1) << datashift;
int numbytes = ROM_GETLENGTH(romp);
int groupsize = ROM_GETGROUPSIZE(romp);
int skip = ROM_GETSKIPCOUNT(romp);
int reversed = ROM_ISREVERSED(romp);
int numgroups = (numbytes + groupsize - 1) / groupsize;
UINT8 *base = romdata->region->base() + ROM_GETOFFSET(romp);
UINT32 tempbufsize;
int i;
LOG(("Loading ROM data: offs=%X len=%X mask=%02X group=%d skip=%d reverse=%d\n", ROM_GETOFFSET(romp), numbytes, datamask, groupsize, skip, reversed));
/* make sure the length was an even multiple of the group size */
if (numbytes % groupsize != 0)
mame_printf_warning("Warning in RomModule definition: %s length not an even multiple of group size\n", ROM_GETNAME(romp));
/* make sure we only fill within the region space */
if (ROM_GETOFFSET(romp) + numgroups * groupsize + (numgroups - 1) * skip > romdata->region->bytes())
fatalerror("Error in RomModule definition: %s out of memory region space\n", ROM_GETNAME(romp));
/* make sure the length was valid */
if (numbytes == 0)
fatalerror("Error in RomModule definition: %s has an invalid length\n", ROM_GETNAME(romp));
/* special case for simple loads */
if (datamask == 0xff && (groupsize == 1 || !reversed) && skip == 0)
return rom_fread(romdata, base, numbytes, parent_region);
/* use a temporary buffer for complex loads */
tempbufsize = MIN(TEMPBUFFER_MAX_SIZE, numbytes);
dynamic_buffer tempbuf(tempbufsize);
/* chunky reads for complex loads */
skip += groupsize;
while (numbytes > 0)
{
int evengroupcount = (tempbufsize / groupsize) * groupsize;
int bytesleft = (numbytes > evengroupcount) ? evengroupcount : numbytes;
UINT8 *bufptr = tempbuf;
/* read as much as we can */
LOG((" Reading %X bytes into buffer\n", bytesleft));
if (rom_fread(romdata, bufptr, bytesleft, parent_region) != bytesleft)
return 0;
numbytes -= bytesleft;
LOG((" Copying to %p\n", base));
/* unmasked cases */
if (datamask == 0xff)
{
/* non-grouped data */
if (groupsize == 1)
for (i = 0; i < bytesleft; i++, base += skip)
*base = *bufptr++;
/* grouped data -- non-reversed case */
else if (!reversed)
while (bytesleft)
{
for (i = 0; i < groupsize && bytesleft; i++, bytesleft--)
base[i] = *bufptr++;
base += skip;
}
/* grouped data -- reversed case */
else
while (bytesleft)
{
for (i = groupsize - 1; i >= 0 && bytesleft; i--, bytesleft--)
base[i] = *bufptr++;
base += skip;
}
}
/* masked cases */
else
{
/* non-grouped data */
if (groupsize == 1)
for (i = 0; i < bytesleft; i++, base += skip)
*base = (*base & ~datamask) | ((*bufptr++ << datashift) & datamask);
/* grouped data -- non-reversed case */
else if (!reversed)
while (bytesleft)
{
for (i = 0; i < groupsize && bytesleft; i++, bytesleft--)
base[i] = (base[i] & ~datamask) | ((*bufptr++ << datashift) & datamask);
base += skip;
}
/* grouped data -- reversed case */
else
while (bytesleft)
{
for (i = groupsize - 1; i >= 0 && bytesleft; i--, bytesleft--)
base[i] = (base[i] & ~datamask) | ((*bufptr++ << datashift) & datamask);
base += skip;
}
}
}
LOG((" All done\n"));
return ROM_GETLENGTH(romp);
}
static int read_rom_data(struct rom_load_data *romdata, const struct RomModule *romp)
{
int datashift = ROM_GETBITSHIFT(romp);
int datamask = ((1 << ROM_GETBITWIDTH(romp)) - 1) << datashift;
int numbytes = ROM_GETLENGTH(romp);
int groupsize = ROM_GETGROUPSIZE(romp);
int skip = ROM_GETSKIPCOUNT(romp);
int reversed = ROM_ISREVERSED(romp);
int numgroups = (numbytes + groupsize - 1) / groupsize;
UINT8 *base = romdata->regionbase + ROM_GETOFFSET(romp);
int i;
debugload("Loading ROM data: offs=%X len=%X mask=%02X group=%d skip=%d reverse=%d\n", ROM_GETOFFSET(romp), numbytes, datamask, groupsize, skip, reversed);
/* make sure the length was an even multiple of the group size */
if (numbytes % groupsize != 0)
{
printf("Error in RomModule definition: %s length not an even multiple of group size\n", ROM_GETNAME(romp));
return -1;
}
/* make sure we only fill within the region space */
if (ROM_GETOFFSET(romp) + numgroups * groupsize + (numgroups - 1) * skip > romdata->regionlength)
{
printf("Error in RomModule definition: %s out of memory region space\n", ROM_GETNAME(romp));
return -1;
}
/* make sure the length was valid */
if (numbytes == 0)
{
printf("Error in RomModule definition: %s has an invalid length\n", ROM_GETNAME(romp));
return -1;
}
/* special case for simple loads */
if (datamask == 0xff && (groupsize == 1 || !reversed) && skip == 0)
return rom_fread(romdata, base, numbytes);
/* chunky reads for complex loads */
skip += groupsize;
while (numbytes)
{
int evengroupcount = (sizeof(romdata->tempbuf) / groupsize) * groupsize;
int bytesleft = (numbytes > evengroupcount) ? evengroupcount : numbytes;
UINT8 *bufptr = romdata->tempbuf;
/* read as much as we can */
debugload(" Reading %X bytes into buffer\n", bytesleft);
if (rom_fread(romdata, romdata->tempbuf, bytesleft) != bytesleft)
return 0;
numbytes -= bytesleft;
debugload(" Copying to %08X\n", (int)base);
/* unmasked cases */
if (datamask == 0xff)
{
/* non-grouped data */
if (groupsize == 1)
for (i = 0; i < bytesleft; i++, base += skip)
*base = *bufptr++;
/* grouped data -- non-reversed case */
else if (!reversed)
while (bytesleft)
{
for (i = 0; i < groupsize && bytesleft; i++, bytesleft--)
base[i] = *bufptr++;
base += skip;
}
/* grouped data -- reversed case */
else
while (bytesleft)
{
for (i = groupsize - 1; i >= 0 && bytesleft; i--, bytesleft--)
base[i] = *bufptr++;
base += skip;
}
}
/* masked cases */
else
{
/* non-grouped data */
if (groupsize == 1)
for (i = 0; i < bytesleft; i++, base += skip)
*base = (*base & ~datamask) | ((*bufptr++ << datashift) & datamask);
/* grouped data -- non-reversed case */
else if (!reversed)
while (bytesleft)
{
for (i = 0; i < groupsize && bytesleft; i++, bytesleft--)
base[i] = (base[i] & ~datamask) | ((*bufptr++ << datashift) & datamask);
base += skip;
}
/* grouped data -- reversed case */
else
while (bytesleft)
{
for (i = groupsize - 1; i >= 0 && bytesleft; i--, bytesleft--)
base[i] = (base[i] & ~datamask) | ((*bufptr++ << datashift) & datamask);
base += skip;
}
}
}
debugload(" All done\n");
return ROM_GETLENGTH(romp);
}