/**
* @brief 从一个文件中任意位置读入任意长度的字符（不能超过文件的大小）
*
* @param [in] head : struct dbSysHead *
* @param [in] fid : long 文件标识
* @param [in] pos : long 文件起始地址
* @param [in] legnth : long 读取的长度
* @param [out] des : void * 空指针，用于接受读取的字符
* @return int
*
* @author tianzhenwu
* @date 2015/10/20
**/
int rdFile( struct dbSysHead *head, int bufferID, long fid, long pos, long length, void *des)
{
int i;
int idx;
long staPage,endPage;
long pnt;
long rSta,rEnd;
long pageMap;
char *tmp;
idx = queryFileID(head,fid);
if( idx<0 ) {
isAvail(NULL,"rdFile",ARRAY);
}
if( (pos+length) > SIZE_PER_PAGE * head->desc.fileDesc[idx].filePageNum ){
// 注意：SIZE_PER_PAGE * head->desc.fileDesc[i].filePageNum 可能溢出
isAvail(NULL,"rdFile",BOUND);
}
// 这里没有必要malloc一块临时的内存区，这样浪费时间。应该直接把数据写到des
tmp = (char *)malloc( length+1 );
isAvail( tmp, "rdFile", MALLOC );
staPage = pos/SIZE_PER_PAGE;
endPage = (pos+length-1)/SIZE_PER_PAGE;
pnt = 0;
for( i=staPage; i<(endPage+1); i++ ) {
rSta = (pos+pnt) - ( (pos+pnt)/SIZE_PER_PAGE ) * SIZE_PER_PAGE;
rEnd = ( (i+1)*SIZE_PER_PAGE>(pos+length)) ? ((pos+length) - ((pos+length)/SIZE_PER_PAGE)*SIZE_PER_PAGE) : SIZE_PER_PAGE ;
pageMap = mapPage( head, fid, i);
readInPage( head, bufferID, pageMap, rSta, rEnd - rSta, tmp+pnt );
pnt += (rEnd-rSta);
}
memcpy( des, tmp, length);
free(tmp);
return 0;
}
static void write(RomMapperMegaFlashRomScc* rm, UInt16 address, UInt8 value)
{
int change = 0;
int bank;
address += 0x4000;
if (address >= 0x9800 && address < 0xa000 && rm->sccEnable) {
sccWrite(rm->scc, address & 0xff, value);
}
address -= 0x4000;
bank = address >> 13;
if (rm->flashPage[bank] >= 0) {
amdFlashWrite(rm->flash, (address & 0x1fff) + 0x2000 * rm->flashPage[bank], value);
}
if ((address - 0x1000) & 0x1800) {
return;
}
if (bank == 2) {
int newEnable = (value & 0x3F) == 0x3F;
change = rm->sccEnable != newEnable;
rm->sccEnable = newEnable;
}
value &= rm->romMask;
if (rm->romMapper[bank] != value || change) {
mapPage(rm, bank, value);
}
}
static void loadState(RomMapperMegaFlashRomScc* rm)
{
SaveState* state = saveStateOpenForRead("mapperMegaFlashRomScc");
char tag[16];
int i;
for (i = 0; i < 4; i++) {
sprintf(tag, "romMapper%d", i);
rm->romMapper[i] = saveStateGet(state, tag, 0);
}
rm->sccEnable = saveStateGet(state, "sccEnable", 0);
saveStateClose(state);
sccLoadState(rm->scc);
amdFlashLoadState(rm->flash);
for (i = 0; i < 4; i++) {
mapPage(rm, i, rm->romMapper[i]);
}
}
/**
* @brief 往一个文件中任意位置写入任意长度的字符，若超过文件长度，则会自动扩展文件长度
*
* @param [in] head : struct dbSysHead *
* @param [in] fid : long 文件标识
* @param [in] pos : long 文件起始地址
* @param [in] legnth : long 写入的长度
* @param [out] des : void * 空指针，用于传递要写入的字符
* @return int
*
* @author tianzhenwu
* @date 2015/10/20
**/
int wtFile( struct dbSysHead *head, int bufferID, long fid, long pos, long length, void *des)
{
int i;
int idx;
int extpage;
long staPage,endPage;
long pnt;
long rSta,rEnd;
long pageMap;
char *tmp;
idx = queryFileID(head,fid);
if( idx<0 ) {
isAvail(NULL,"wtFile",ARRAY);
}
if( (pos+length) > SIZE_PER_PAGE * head->desc.fileDesc[idx].filePageNum ){
// 注意：SIZE_PER_PAGE * head->desc.fileDesc[i].filePageNum 可能溢出
extpage = (pos+length) / SIZE_PER_PAGE - head->desc.fileDesc[idx].filePageNum + 1;
extendFileSpace( head, fid, extpage );
}
tmp = (char *)malloc( length+1 );
isAvail( tmp, "wtFile", MALLOC );
memcpy( tmp, des, length );
staPage = pos/SIZE_PER_PAGE;
endPage = (pos+length-1)/SIZE_PER_PAGE;
pnt = 0;
for( i=staPage; i<(endPage+1); i++ ) {
rSta = (pos+pnt) - ( (pos+pnt)/SIZE_PER_PAGE ) * SIZE_PER_PAGE;
rEnd = ( (i+1)*SIZE_PER_PAGE>(pos+length)) ? ((pos+length) - ((pos+length)/SIZE_PER_PAGE)*SIZE_PER_PAGE) : SIZE_PER_PAGE ;
pageMap = mapPage( head, fid, i);
writeInPage( head, bufferID, pageMap, rSta, rEnd - rSta, tmp+pnt );
pnt += (rEnd-rSta);
}
free(tmp);
return 0;
}
int romMapperMegaFlashRomSccCreate(const char* filename, UInt8* romData,
int size, int slot, int sslot, int startPage, UInt32 writeProtectMask)
{
DeviceCallbacks callbacks = { destroy, reset, saveState, loadState };
RomMapperMegaFlashRomScc* rm;
int i;
rm = calloc(1, sizeof(RomMapperMegaFlashRomScc));
rm->deviceHandle = deviceManagerRegister(ROM_MEGAFLSHSCC, &callbacks, rm);
slotRegister(slot, sslot, startPage, 4, read, peek, write, destroy, rm);
if (size >= 0x80000) {
size = 0x80000;
}
rm->romData = malloc(0x80000);
memset(rm->romData, 0xff, 0x80000);
memcpy(rm->romData, romData, size);
rm->size = 0x80000;
rm->slot = slot;
rm->sslot = sslot;
rm->romMask = rm->size / 0x2000 - 1;
rm->startPage = startPage;
rm->scc = sccCreate(boardGetMixer());
sccSetMode(rm->scc, SCC_REAL);
rm->sccEnable = 0;
rm->flash = amdFlashCreate(AMD_TYPE_2, 0x80000, 0x10000, writeProtectMask, romData, size, sramCreateFilenameWithSuffix(filename, "", ".sram"), 1);
for (i = 0; i < 4; i++) {
mapPage(rm, i, i);
}
return 1;
}
