// Read a UTF-8 file as a std::string, throw errors if file is binary or malformed UTF-8
inline std::string read_text_utf8(const std::string& filename, const boost::uint64_t max_size = 0)
{
BufferPtr bp = read_binary(filename, max_size);
// check if binary
if (bp->contains_null())
OPENVPN_THROW(file_is_binary, "file is binary: " << filename);
// remove Windows UTF-8 BOM if present
if (bp->size() >= 3)
{
const unsigned char *data = bp->c_data();
if (data[0] == 0xEF && data[1] == 0xBB && data[2] == 0xBF)
bp->advance(3);
}
// verify that file is valid UTF-8
if (!Unicode::is_valid_utf8(bp->c_data(), bp->size()))
OPENVPN_THROW(file_not_utf8, "file is not UTF8: " << filename);
return std::string((const char *)bp->c_data(), bp->size());
}
