std::string OleMainStream::getPiecesTableBuffer(const char *headerBuffer, OleStream &tableStream) {
unsigned int clxOffset = OleUtil::getU4Bytes(headerBuffer, 0x01A2); //offset for CLX structure
unsigned int clxLength = OleUtil::getU4Bytes(headerBuffer, 0x01A6); //offset for value of CLX structure length
//1 step : loading CLX table from table stream
char *clxBuffer = new char[clxLength];
tableStream.seek(clxOffset, true);
tableStream.read(clxBuffer, clxLength);
std::string clx(clxBuffer, clxLength);
delete[] clxBuffer;
//2 step: searching for pieces table buffer at CLX
//(determines it by 0x02 as start symbol)
size_t from = 0;
size_t i;
std::string pieceTableBuffer;
while ((i = clx.find_first_of(0x02, from)) != std::string::npos) {
unsigned int pieceTableLength = OleUtil::getU4Bytes(clx.c_str(), i + 1);
pieceTableBuffer = std::string(clx, i + 1 + 4);
if (pieceTableBuffer.length() != pieceTableLength) {
from = i + 1;
continue;
}
break;
}
return pieceTableBuffer;
}
bool OleMainStream::readToBuffer(std::string &result, unsigned int offset, std::size_t length, OleStream &stream) {
char *buffer = new char[length];
stream.seek(offset, true);
if (stream.read(buffer, length) != length) {
return false;
}
result = std::string(buffer, length);
delete[] buffer;
return true;
}
std::string OleMainStream::getPiecesTableBuffer(const char *headerBuffer, OleStream &tableStream) {
unsigned int clxOffset = OleUtil::getU4Bytes(headerBuffer, 0x01A2); //offset for CLX structure
unsigned int clxLength = OleUtil::getU4Bytes(headerBuffer, 0x01A6); //offset for value of CLX structure length
//1 step : loading CLX table from table stream
char *clxBuffer = new char[clxLength];
if (!tableStream.seek(clxOffset, true)) {
ZLLogger::Instance().println("DocPlugin", "getPiecesTableBuffer -- error for seeking to CLX structure");
return std::string();
}
if (tableStream.read(clxBuffer, clxLength) != clxLength) {
ZLLogger::Instance().println("DocPlugin", "getPiecesTableBuffer -- CLX structure length is invalid");
return std::string();
}
std::string clx(clxBuffer, clxLength);
delete[] clxBuffer;
//2 step: searching for pieces table buffer at CLX
//(determines it by 0x02 as start symbol)
std::size_t from = 0;
std::size_t i;
std::string pieceTableBuffer;
while ((i = clx.find_first_of(0x02, from)) != std::string::npos) {
if (clx.size() < i + 1 + 4) {
ZLLogger::Instance().println("DocPlugin", "getPiecesTableBuffer -- CLX structure has invalid format");
return std::string();
}
unsigned int pieceTableLength = OleUtil::getU4Bytes(clx.c_str(), i + 1);
pieceTableBuffer = std::string(clx, i + 1 + 4);
if (pieceTableBuffer.length() != pieceTableLength) {
from = i + 1;
continue;
}
break;
}
return pieceTableBuffer;
}
