vector<unsigned char> ReadBytes(FILE* file, size_t numBytes)
{
if(file == NULL)
{
throw logic_error("Assertion failed: file is null.");
}
vector<unsigned char> buffer(numBytes, 0);
if(numBytes == 0)
{
return buffer;
}
size_t bytesRead = fread(&buffer[0], 1, numBytes, file);
if(ferror(file) != 0)
{
throw IoError("Error reading from file.");
}
if(bytesRead < numBytes)
{
buffer.resize(bytesRead);
}
return buffer;
}
void SeekOrDie(FILE* file, long offset, SeekOrigin origin)
{
int seekSuccess = fseek(file, offset, static_cast<int>(origin));
if(seekSuccess != 0)
{
throw IoError("Error while seeking.");
}
}
long TellOrDie(FILE* file)
{
long seekPosition = ftell(file);
if(seekPosition == -1)
{
throw IoError("Error while getting file position.");
}
return seekPosition;
}
vector<unsigned char> ReadBytesOrDie(FILE* file, size_t numBytes)
{
vector<unsigned char> bytes = ReadBytes(file, numBytes);
if(bytes.size() < numBytes)
{
throw IoError("Unexpected end of file.");
}
else
{
return bytes;
}
}
static int
signalSqlite3ErrorAndThrow(const char * file_name, sqlite3 * connection)
{
auto message = boost::format("Error operating on SQLite3 "
"database %1%: \"%2%\"")
% file_name
% sqlite3_errmsg(connection);
Logger * log = Logger::get_instance();
log->error(message);
throw IoError(message);
}
FILE* OpenOrDie(const char* filename, const char* mode)
{
FILE* file = fopen(filename, mode);
if(file == NULL)
{
throw IoError(string("Could not open file ") + filename + ".");
}
else
{
return file;
}
#ifdef _MSC_VER
#pragma warning(default:4996)
#endif
}
