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Rewrote and simplified the game ID detector. It now properly works with SCI0-SCI2.1 games

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svn-id: r49142
This commit is contained in:
Filippos Karapetis 2010-05-22 16:50:15 +00:00
parent 45a5c29cdf
commit 9b6a3712d6
1 changed files with 27 additions and 53 deletions
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80
engines/sci/detection.cpp
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@ -205,70 +205,44 @@ Common::Language charToScummVMLanguage(const char c) {
}
}
#define READ_UINT16(buf) (!resMan->isSci11Mac() ? READ_LE_UINT16(buf) : READ_BE_UINT16(buf))
#define READ_UINT16(ptr) (!resMan->isSci11Mac() ? READ_LE_UINT16(ptr) : READ_BE_UINT16(ptr))
// Finds the internal ID of the current game from script 0
Common::String getSierraGameId(ResourceManager *resMan) {
Resource *script = resMan->findResource(ResourceId(kResourceTypeScript, 0), false);
uint16 curOffset = (getSciVersion() == SCI_VERSION_0_EARLY) ? 2 : 0;
uint16 objLength = 0;
int objType = 0;
int16 exportsOffset = 0;
int16 magicOffset = (getSciVersion() < SCI_VERSION_1_1) ? 8 : 0;
// In SCI0-SCI1, the heap is embedded in the script. In SCI1.1+, it's separated
Resource *heap = 0;
int nameSelector = 0;
byte *exportPtr, *heapPtr;
// TODO: SCI1.1 version
if (getSciVersion() >= SCI_VERSION_1_1) {
//if (READ_UINT16(script->data + 6) > 0)
// exportsOffset = READ_UINT16(script->data + 6 + 2);
return "sci";
// Seek to the name selector of the first export
if (getSciVersion() < SCI_VERSION_1_1) {
int extraSci0EarlyBytes = (getSciVersion() == SCI_VERSION_0_EARLY) ? 2 : 0;
nameSelector = 3;
exportPtr = script->data + extraSci0EarlyBytes + 4 + 2;
heapPtr = script->data;
} else {
nameSelector = 5 + 3;
exportPtr = script->data + 4 + 2 + 2;
heap = resMan->findResource(ResourceId(kResourceTypeHeap, 0), false);
heapPtr = heap->data;
}
// Now find the export table of the script
byte *seeker = heapPtr + READ_UINT16(heapPtr + READ_UINT16(exportPtr) + nameSelector * 2);
char sierraId[20];
int i = 0;
byte curChar = 0;
do {
objType = READ_UINT16(script->data + curOffset);
if (!objType)
break;
objLength = READ_UINT16(script->data + curOffset + 2);
curOffset += 4; // skip header
curChar = *(seeker + i);
sierraId[i++] = curChar;
} while (curChar != 0);
switch (objType) {
case SCI_OBJ_EXPORTS:
exportsOffset = READ_UINT16(script->data + curOffset + 2);
break;
case SCI_OBJ_OBJECT:
case SCI_OBJ_CLASS:
// The game object is the first export
if (curOffset == exportsOffset - magicOffset) {
// The name selector is the third one
uint16 nameSelectorOffset = READ_UINT16(script->data + curOffset + magicOffset + 3 * 2);
char sierraId[20];
int i = 0;
byte curChar = 0;
do {
curChar = *(script->data + nameSelectorOffset + i);
sierraId[i++] = curChar;
} while (curChar != 0);
return sierraId;
}
break;
case SCI_OBJ_CODE:
case SCI_OBJ_SYNONYMS:
case SCI_OBJ_LOCALVARS:
case SCI_OBJ_POINTERS: // A relocation table
// Ignore
break;
}
curOffset += objLength - 4;
} while (objType != 0 && curOffset < script->size - 2);
return "sci"; // detection failed
return sierraId;
}
#undef READ_UINT16
const ADGameDescription *SciMetaEngine::fallbackDetect(const Common::FSList &fslist) const {
bool foundResMap = false;
bool foundRes000 = false;