bool A5InitLoader::isSupported(const CodeSegment &code, const uint32 offset, const uint32 size) throw() {
// Check whether the name matches
if (code.getName() != "%A5Init")
return false;
const byte *memory = _executable.getMemory();
const uint32 memorySize = _executable.getMemorySize();
// Check whether it only exports one function
if (!code.is32BitSegment() && READ_UINT16_BE(memory + offset + 2) != 0x0001)
return false;
else if (READ_UINT32_BE(memory + offset + 8) != 0x00000001)
return false;
const uint32 internalOffset = (code.is32BitSegment() ? 46 : 10);
const uint32 infoOffset = READ_UINT16_BE(memory + offset + internalOffset) + internalOffset;
// Check whether the information area is still inside the memory dump
if (offset + infoOffset + 16 >= memorySize)
return false;
const uint32 dataOffset = READ_UINT32_BE(memory + offset + infoOffset + 8);
const uint32 relocationDataOffset = READ_UINT32_BE(memory + offset + infoOffset + 12);
// Check whether the compressed data is still in the memory dump
if (offset + dataOffset >= memorySize)
return false;
// Check whether the relocation data is still in the memory dump
if (offset + relocationDataOffset >= memorySize)
return false;
// Looks like it is an %A5Init segment
return true;
}
void A5InitLoader::load(const CodeSegment &code, const uint32 offset, const uint32 size, std::ostream &out) throw(std::exception) {
byte *memory = _executable.getMemory();
const uint32 internalOffset = (code.is32BitSegment() ? 46 : 10);
const uint32 infoOffset = READ_UINT16_BE(memory + offset + internalOffset) + internalOffset;
const uint32 dataSize = READ_UINT32_BE(memory + offset + infoOffset + 0);
const uint16 needLoadBit = READ_UINT16_BE(memory + offset + infoOffset + 4);
const uint32 dataOffset = READ_UINT32_BE(memory + offset + infoOffset + 8);
const uint32 relocationDataOffset = READ_UINT32_BE(memory + offset + infoOffset + 12);
// Output various information about the %A5Init segment
out << "%A5Init info data:\n"
"\tData size: " << dataSize << "\n"
"\tNeed to load: " << needLoadBit << "\n"
"\tData offset: " << dataOffset << "\n"
"\tRelocation offset: " << relocationDataOffset << std::endl;
// Check whether we actually have to do some work
if (needLoadBit != 1) {
out << "A5 data does not need any initialization" << std::endl;
return;
}
const Code0Segment &code0 = _executable.getCode0Segment();
uint8 *dst = memory + code0.getApplicationGlobalsSize() - dataSize;
// uncompress the world
uncompressA5World(dst, memory + offset + infoOffset + dataOffset);
// relocate the world
relocateWorld(code0.getApplicationGlobalsSize(), dst, memory + offset + infoOffset + relocationDataOffset, out);
// Mark segment as initialized
WRITE_UINT16_BE(memory + offset + infoOffset + 4, 0);
}
