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added mscdex function 0f : Get directory entry

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1511
This commit is contained in:
Ulf Wohlers 2003-12-30 23:55:47 +00:00
parent 99b81667e5
commit 4a8f40c92d
1 changed files with 98 additions and 2 deletions
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100
src/dos/dos_mscdex.cpp
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@ -109,6 +109,7 @@ public:
bool GetCopyrightName (Bit16u drive, PhysPt data);
bool GetAbstractName (Bit16u drive, PhysPt data);
bool GetDocumentationName(Bit16u drive, PhysPt data);
bool GetDirectoryEntry (Bit16u drive, bool copyFlag, PhysPt pathname, PhysPt buffer, Bitu& error);
bool ReadVTOC (Bit16u drive, Bit16u volume, PhysPt data, Bit16u& error);
bool ReadSectors (Bit16u drive, Bit32u sector, Bit16u num, PhysPt data);
bool ReadSectors (Bit8u subUnit, bool raw, Bit32u sector, Bit16u num, PhysPt data);
@ -128,8 +129,10 @@ public:
private:
PhysPt GetDefaultBuffer (void);
Bit16u numDrives;
typedef struct SDriveInfo {
Bit8u drive; // drive letter in dosbox
Bit8u physDrive; // drive letter in system
@ -142,6 +145,7 @@ private:
Bit32u volumeSize; // for media change
} TDriveInfo;
PhysPt defaultBuffer;
TDriveInfo dinfo[MSCDEX_MAX_DRIVES];
CDROM_Interface* cdrom[MSCDEX_MAX_DRIVES];
@ -153,13 +157,18 @@ CMscdex::CMscdex(void)
{
numDrives = 0;
rootDriverHeaderSeg = 0;
defaultBuffer = 0;
memset(dinfo,0,sizeof(dinfo));
for (Bit32u i=0; i<MSCDEX_MAX_DRIVES; i++) cdrom[i] = 0;
};
CMscdex::~CMscdex(void)
{
if (defaultBuffer!=0) {
DOS_FreeMemory(RealSeg(defaultBuffer));
defaultBuffer = 0;
}
for (Bit16u i=0; i<GetNumDrives(); i++) {
delete (cdrom)[i];
cdrom[i] = 0;
@ -284,6 +293,16 @@ int CMscdex::AddDrive(Bit16u _drive, char* physicalPath, Bit8u& subUnit)
return 4;
};
PhysPt CMscdex::GetDefaultBuffer(void)
{
if (defaultBuffer==0) {
Bit16u seg,size = 128;
if (!DOS_AllocateMemory(&seg,&size)) E_Exit("MSCDEX: cannot allocate default buffer.");
defaultBuffer = PhysMake(seg,0);
};
return defaultBuffer;
};
void CMscdex::GetDriverInfo (PhysPt data)
{
for (Bit16u i=0; i<GetNumDrives(); i++) {
@ -527,6 +546,77 @@ bool CMscdex::ReadSectors(Bit16u drive, Bit32u sector, Bit16u num, PhysPt data)
return ReadSectors(GetSubUnit(drive),false,sector,num,data);
};
bool CMscdex::GetDirectoryEntry(Bit16u drive, bool copyFlag, PhysPt pathname, PhysPt buffer, Bitu& error)
{
char volumeID[6] = {0};
char searchName[256];
char entryName[256];
bool foundComplete = false;
bool foundName;
char* useName;
Bitu entryLength,nameLength;
// clear error
error = 0;
MEM_StrCopy(pathname+1,searchName,mem_readb(pathname));
upcase(searchName);
char* searchPos = searchName;
// LOG(LOG_MISC,LOG_ERROR)("MSCDEX: Get DirEntry : Find : %s",searchName);
// read vtoc
PhysPt defBuffer = GetDefaultBuffer();
if (!ReadSectors(GetSubUnit(drive),false,16,1,defBuffer)) return false;
// TODO: has to be iso 9960
MEM_StrCopy(defBuffer+1,volumeID,5); volumeID[5] = 0;
bool iso = (strcmp("CD001",volumeID)==0);
if (!iso) E_Exit("MSCDEX: GetDirEntry: Not an ISO 9960 CD.");
// get directory position
Bitu dirEntrySector = mem_readd(defBuffer+156+2);
Bits dirSize = mem_readd(defBuffer+156+10);
Bitu index;
while (dirSize>0) {
index = 0;
if (!ReadSectors(GetSubUnit(drive),false,dirEntrySector,1,defBuffer)) return false;
// Get string part
foundName = false;
useName = searchPos;
searchPos = strchr(searchPos,'\\');
if (searchPos) { *searchPos = 0; searchPos++; }
else foundComplete = true;
do {
entryLength = mem_readb(defBuffer+index);
if (entryLength==0) break;
nameLength = mem_readb(defBuffer+index+32);
MEM_StrCopy(defBuffer+index+33,entryName,nameLength);
if (strcmp(entryName,useName)==0) {
// LOG(LOG_MISC,LOG_ERROR)("MSCDEX: Get DirEntry : Found : %s",useName);
foundName = true;
break;
}
index += entryLength;
} while (index+33<=2048);
if (foundName) {
// TO DO : name gefunden, Daten in den Buffer kopieren
if (foundComplete) {
if (copyFlag) E_Exit("MSCDEX: GetDirEntry: Unsupported copyflag");
// Direct copy
MEM_BlockCopy(buffer,defBuffer+index,entryLength);
error = iso ? 1:0;
return true;
}
// directory wechseln
dirEntrySector = mem_readd(defBuffer+index+2);
dirSize = mem_readd(defBuffer+index+10);
} else {
// continue search in next sector
dirSize -= 2048;
dirEntrySector++;
}
};
error = 2; // file not found
return false; // not found
};
bool CMscdex::GetCurrentPos(Bit8u subUnit, TMSF& pos)
{
if (subUnit>=numDrives) return false;
@ -863,6 +953,12 @@ static bool MSCDEX_Handler(void)
case 0x150D: /* Get drives */
mscdex->GetDrives(data);
return true;
case 0x150F: { // Get directory entry
Bitu error;
bool success = mscdex->GetDirectoryEntry(reg_cl,reg_ch&1,data,PhysMake(reg_si,reg_di),error);
reg_ax = error;
CALLBACK_SCF(!success);
}; return true;
case 0x1510: /* Device driver request */
mscdex->SendDriverRequest(reg_cx,data);
return true;