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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "sci/engine/kernel.h"
#include "sci/engine/object.h"
#include "sci/engine/seg_manager.h"
#ifdef ENABLE_SCI32
#include "sci/engine/features.h"
#endif
namespace Sci {
// This helper function is used by Script::relocateLocal and Object::relocate
// Duplicate in segment.cpp and script.cpp
static bool relocateBlock(Common::Array<reg_t> &block, int block_location, SegmentId segment, int location, size_t scriptSize) {
int rel = location - block_location;
if (rel < 0)
return false;
uint idx = rel >> 1;
if (idx >= block.size())
return false;
if (rel & 1) {
error("Attempt to relocate odd variable #%d.5e (relative to %04x)\n", idx, block_location);
return false;
}
block[idx].setSegment(segment); // Perform relocation
if (getSciVersion() >= SCI_VERSION_1_1 && getSciVersion() <= SCI_VERSION_2_1_LATE)
block[idx].incOffset(scriptSize);
return true;
}
void Object::init(const SciSpan<const byte> &buf, reg_t obj_pos, bool initVariables) {
const SciSpan<const byte> data = buf.subspan(obj_pos.getOffset());
_baseObj = data;
_pos = obj_pos;
if (getSciVersion() <= SCI_VERSION_1_LATE) {
const SciSpan<const byte> header = buf.subspan(obj_pos.getOffset() - kOffsetHeaderSize);
_variables.resize(header.getUint16LEAt(kOffsetHeaderSelectorCounter));
// Non-class objects do not have a baseVars section
const uint16 infoSelector = data.getUint16SEAt((_offset + 2) * sizeof(uint16));
if (infoSelector & kInfoFlagClass) {
_baseVars.reserve(_variables.size());
uint baseVarsOffset = _variables.size() * sizeof(uint16);
for (uint i = 0; i < _variables.size(); ++i) {
_baseVars.push_back(data.getUint16SEAt(baseVarsOffset));
baseVarsOffset += sizeof(uint16);
}
}
_methodCount = data.getUint16LEAt(header.getUint16LEAt(kOffsetHeaderFunctionArea) - 2);
for (int i = 0; i < _methodCount * 2 + 2; ++i) {
_baseMethod.push_back(data.getUint16SEAt(header.getUint16LEAt(kOffsetHeaderFunctionArea) + i * 2));
}
} else if (getSciVersion() >= SCI_VERSION_1_1 && getSciVersion() <= SCI_VERSION_2_1_LATE) {
_variables.resize(data.getUint16SEAt(2));
// Non-class objects do not have a baseVars section
const uint16 infoSelector = data.getUint16SEAt((_offset + 2) * sizeof(uint16));
if (infoSelector & kInfoFlagClass) {
_baseVars.reserve(_variables.size());
uint baseVarsOffset = data.getUint16SEAt(4);
for (uint i = 0; i < _variables.size(); ++i) {
_baseVars.push_back(buf.getUint16SEAt(baseVarsOffset));
baseVarsOffset += sizeof(uint16);
}
}
_methodCount = buf.getUint16SEAt(data.getUint16SEAt(6));
for (int i = 0; i < _methodCount * 2 + 3; ++i) {
_baseMethod.push_back(buf.getUint16SEAt(data.getUint16SEAt(6) + i * 2));
}
} else if (getSciVersion() == SCI_VERSION_3) {
initSelectorsSci3(buf, initVariables);
}
if (initVariables) {
if (getSciVersion() <= SCI_VERSION_2_1_LATE) {
for (uint i = 0; i < _variables.size(); i++)
_variables[i] = make_reg(0, data.getUint16SEAt(i * 2));
} else {
_infoSelectorSci3 = make_reg(0, data.getUint16SEAt(10));
}
}
}
const Object *Object::getClass(SegManager *segMan) const {
return isClass() ? this : segMan->getObject(getSuperClassSelector());
}
int Object::locateVarSelector(SegManager *segMan, Selector slc) const {
const Common::Array<uint16> *buf;
const uint varCount = getVarCount();
if (getSciVersion() <= SCI_VERSION_2_1_LATE) {
const Object *obj = getClass(segMan);
buf = &obj->_baseVars;
} else if (getSciVersion() == SCI_VERSION_3) {
buf = &_baseVars;
}
for (uint i = 0; i < varCount; i++)
if ((*buf)[i] == slc) // Found it?
return i; // report success
return -1; // Failed
}
bool Object::relocateSci0Sci21(SegmentId segment, int location, size_t scriptSize) {
return relocateBlock(_variables, getPos().getOffset(), segment, location, scriptSize);
}
bool Object::relocateSci3(SegmentId segment, uint32 location, int offset, size_t scriptSize) {
assert(_propertyOffsetsSci3.size());
assert(offset >= 0 && (uint)offset < scriptSize);
for (uint i = 0; i < _variables.size(); ++i) {
if (location == _propertyOffsetsSci3[i]) {
_variables[i].setSegment(segment);
_variables[i].incOffset(offset);
return true;
}
}
return false;
}
int Object::propertyOffsetToId(SegManager *segMan, int propertyOffset) const {
int selectors = getVarCount();
if (propertyOffset < 0 || (propertyOffset >> 1) >= selectors) {
error("Applied propertyOffsetToId to invalid property offset %x (property #%d not in [0..%d])",
propertyOffset, propertyOffset >> 1, selectors - 1);
return -1;
}
if (getSciVersion() < SCI_VERSION_1_1) {
const SciSpan<const byte> selectoroffset = _baseObj.subspan(kOffsetSelectorSegment + selectors * 2);
return selectoroffset.getUint16SEAt(propertyOffset);
} else {
const Object *obj = this;
if (!isClass())
obj = segMan->getObject(getSuperClassSelector());
return obj->_baseVars[propertyOffset >> 1];
}
}
void Object::initSpecies(SegManager *segMan, reg_t addr) {
uint16 speciesOffset = getSpeciesSelector().getOffset();
if (speciesOffset == 0xffff) // -1
setSpeciesSelector(NULL_REG); // no species
else
setSpeciesSelector(segMan->getClassAddress(speciesOffset, SCRIPT_GET_LOCK, addr.getSegment()));
}
void Object::initSuperClass(SegManager *segMan, reg_t addr) {
uint16 superClassOffset = getSuperClassSelector().getOffset();
if (superClassOffset == 0xffff) // -1
setSuperClassSelector(NULL_REG); // no superclass
else
setSuperClassSelector(segMan->getClassAddress(superClassOffset, SCRIPT_GET_LOCK, addr.getSegment()));
}
bool Object::initBaseObject(SegManager *segMan, reg_t addr, bool doInitSuperClass) {
const Object *baseObj = segMan->getObject(getSpeciesSelector());
if (baseObj) {
uint originalVarCount = _variables.size();
if (_variables.size() != baseObj->getVarCount())
_variables.resize(baseObj->getVarCount());
// Copy base from species class, as we need its selector IDs
_baseObj = baseObj->_baseObj;
assert(_baseObj);
if (doInitSuperClass)
initSuperClass(segMan, addr);
if (_variables.size() != originalVarCount) {
// These objects are probably broken.
// An example is 'witchCage' in script 200 in KQ5 (#3034714),
// but also 'girl' in script 216 and 'door' in script 22.
// In LSL3 a number of sound objects trigger this right away.
// SQ4-floppy's bug #3037938 also seems related.
// The effect is that a number of its method selectors may be
// treated as variable selectors, causing unpredictable effects.
int objScript = segMan->getScript(_pos.getSegment())->getScriptNumber();
// We have to do a little bit of work to get the name of the object
// before any relocations are done.
reg_t nameReg = getNameSelector();
const char *name;
if (nameReg.isNull()) {
name = "<no name>";
} else {
nameReg.setSegment(_pos.getSegment());
name = segMan->derefString(nameReg);
if (!name)
name = "<invalid name>";
}
debugC(kDebugLevelVM, "Object %04x:%04x (name %s, script %d) "
"varnum doesn't match baseObj's: obj %d, base %d",
PRINT_REG(_pos), name, objScript,
originalVarCount, baseObj->getVarCount());
#if 0
// We enumerate the methods selectors which could be hidden here
if (getSciVersion() <= SCI_VERSION_2_1) {
const SegmentRef objRef = segMan->dereference(baseObj->_pos);
assert(objRef.isRaw);
uint segBound = objRef.maxSize/2 - baseObj->getVarCount();
const byte* buf = (const byte *)baseObj->_baseVars;
if (!buf) {
// While loading this may happen due to objects being loaded
// out of order, and we can't proceed then, unfortunately.
segBound = 0;
}
for (uint i = baseObj->getVarCount();
i < originalVarCount && i < segBound; ++i) {
uint16 slc = READ_SCI11ENDIAN_UINT16(buf + 2*i);
// Skip any numbers which happen to be varselectors too
bool found = false;
for (uint j = 0; j < baseObj->getVarCount() && !found; ++j)
found = READ_SCI11ENDIAN_UINT16(buf + 2*j) == slc;
if (found) continue;
// Skip any selectors which aren't method selectors,
// so couldn't be mistaken for varselectors
if (lookupSelector(segMan, _pos, slc, 0, 0) != kSelectorMethod) continue;
warning(" Possibly affected selector: %02x (%s)", slc,
g_sci->getKernel()->getSelectorName(slc).c_str());
}
}
#endif
}
return true;
}
return false;
}
const int EXTRA_GROUPS = 3;
#ifdef ENABLE_SCI32
bool Object::mustSetViewVisible(const int index) const {
if (getSciVersion() == SCI_VERSION_3) {
if ((uint)index < getVarCount()) {
return _mustSetViewVisible[getVarSelector(index) >> 5];
}
return false;
} else {
int minIndex, maxIndex;
if (g_sci->_features->usesAlternateSelectors()) {
minIndex = 24;
maxIndex = 43;
} else {
minIndex = 26;
maxIndex = 44;
}
return index >= minIndex && index <= maxIndex;
}
}
#endif
void Object::initSelectorsSci3(const SciSpan<const byte> &buf, const bool initVariables) {
const SciSpan<const byte> groupInfo = _baseObj.subspan(16);
const SciSpan<const byte> selectorBase = groupInfo.subspan(EXTRA_GROUPS * 32 * 2);
int numGroups = g_sci->getKernel()->getSelectorNamesSize() / 32;
if (g_sci->getKernel()->getSelectorNamesSize() % 32)
++numGroups;
_mustSetViewVisible.resize(numGroups);
int numMethods = 0;
int numProperties = 0;
// Selectors are divided into groups of 32, of which the first
// two selectors are always reserved (because their storage
// space is used by the typeMask).
// We don't know beforehand how many methods and properties
// there are, so we count them first.
for (int groupNr = 0; groupNr < numGroups; ++groupNr) {
byte groupLocation = groupInfo[groupNr];
const SciSpan<const byte> seeker = selectorBase.subspan(groupLocation * 32 * 2);
if (groupLocation != 0) {
// This object actually has selectors belonging to this group
int typeMask = seeker.getUint32SEAt(0);
_mustSetViewVisible[groupNr] = (typeMask & 1);
for (int bit = 2; bit < 32; ++bit) {
int value = seeker.getUint16SEAt(bit * 2);
if (typeMask & (1 << bit)) { // Property
++numProperties;
} else if (value != 0xffff) { // Method
++numMethods;
} else {
// Undefined selector
}
}
} else
_mustSetViewVisible[groupNr] = false;
}
_methodCount = numMethods;
_variables.resize(numProperties);
_baseVars.resize(numProperties);
_propertyOffsetsSci3.resize(numProperties);
// Go through the whole thing again to get the property values
// and method pointers
int propertyCounter = 0;
for (int groupNr = 0; groupNr < numGroups; ++groupNr) {
byte groupLocation = groupInfo[groupNr];
const SciSpan<const byte> seeker = selectorBase.subspan(groupLocation * 32 * 2);
if (groupLocation != 0) {
// This object actually has selectors belonging to this group
int typeMask = seeker.getUint32SEAt(0);
int groupBaseId = groupNr * 32;
for (int bit = 2; bit < 32; ++bit) {
int value = seeker.getUint16SEAt(bit * 2);
if (typeMask & (1 << bit)) { // Property
_baseVars[propertyCounter] = groupBaseId + bit;
if (initVariables) {
_variables[propertyCounter] = make_reg(0, value);
}
uint32 propertyOffset = (seeker + bit * 2) - buf;
_propertyOffsetsSci3[propertyCounter] = propertyOffset;
++propertyCounter;
} else if (value != 0xffff) { // Method
_baseMethod.push_back(groupBaseId + bit);
const uint32 offset = value + buf.getUint32SEAt(0);
assert(offset <= kOffsetMask);
_baseMethod.push_back(offset);
} else {
// Undefined selector
}
}
}
}
if (initVariables) {
_speciesSelectorSci3 = make_reg(0, _baseObj.getUint16SEAt(4));
_superClassPosSci3 = make_reg(0, _baseObj.getUint16SEAt(8));
}
}
} // End of namespace Sci
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