MD5_state MD5_from_string(XString msg)
{
MD5_state state;
MD5_init(&state);
MD5_block block;
const uint64_t msg_full_len = msg.size();
while (msg.size() >= 64)
{
for (int i = 0; i < 0x10; i++)
X[i] = msg[4 * i + 0] | msg[4 * i + 1] << 8 | msg[4 * i + 2] << 16 | msg[4 * i + 3] << 24;
MD5_do_block(&state, block);
msg = msg.xslice_t(64);
}
// now pad 1-512 bits + the 64-bit length - may be two blocks
uint8_t buf[0x40] = {};
really_memcpy(buf, reinterpret_cast<const uint8_t *>(msg.data()), msg.size());
buf[msg.size()] = 0x80; // a single one bit
if (64 - msg.size() > 8)
{
for (int i = 0; i < 8; i++)
buf[0x38 + i] = (msg_full_len * 8) >> (i * 8);
}
for (int i = 0; i < 0x10; i++)
X[i] = buf[4 * i + 0] | buf[4 * i + 1] << 8 | buf[4 * i + 2] << 16 | buf[4 * i + 3] << 24;
MD5_do_block(&state, block);
if (64 - msg.size() <= 8)
{
really_memset0(buf, 0x38);
for (int i = 0; i < 8; i++)
buf[0x38 + i] = (msg_full_len * 8) >> (i * 8);
for (int i = 0; i < 0x10; i++)
X[i] = buf[4 * i + 0] | buf[4 * i + 1] << 8 | buf[4 * i + 2] << 16 | buf[4 * i + 3] << 24;
MD5_do_block(&state, block);
}
inline
bool extract(XString str, HumanTimeDiff *iv)
{
// str is a sequence of [-+]?[0-9]+([ay]|m|[jd]|h|mn|s)
// there are NO spaces here
// parse by counting the number starts
auto is_num = [](char c)
{ return c == '-' || c == '+' || ('0' <= c && c <= '9'); };
if (!str || !is_num(str.front()))
return false;
*iv = HumanTimeDiff{};
while (str)
{
auto it = std::find_if_not(str.begin(), str.end(), is_num);
auto it2 = std::find_if(it, str.end(), is_num);
XString number = str.xislice_h(it);
XString suffix = str.xislice(it, it2);
str = str.xislice_t(it2);
short *ptr = nullptr;
if (suffix == "y"_s || suffix == "a"_s)
ptr = &iv->year;
else if (suffix == "m"_s)
ptr = &iv->month;
else if (suffix == "j"_s || suffix == "d"_s)
ptr = &iv->day;
else if (suffix == "h"_s)
ptr = &iv->hour;
else if (suffix == "mn"_s)
ptr = &iv->minute;
else if (suffix == "s"_s)
ptr = &iv->second;
else
return false;
if (number.startswith('+') && !number.startswith("+-"_s))
number = number.xslice_t(1);
if (*ptr || !extract(number, ptr))
return false;
}
return true;
}
