Visual Studio show this Debug Error:
Run-Time Check Failure #1 - A cast to a smaller data type has caused a loss of
data. If this was intentional, you should mask the source of the cast with the
appropriate bitmask. For example:
char c = (i & 0xFF);
Changing the code in this way will not affect the quality of the resulting
optimized code.
After debug, I find the reason is cast to uint8_t. When cast values bigger
than 256 to uint8_t in line 1421-1423, the Debug Error will be triggered.
//mhd_str.c
size_t
MHD_base64_to_bin_n (const char *base64,
size_t base64_len,
void *bin,
size_t bin_size){
//……
1421 out[j + 0] = (uint8_t) ((((uint8_t) v1) << 2) | (((uint8_t) v2) >>
4));
1422 out[j + 1] = (uint8_t) ((((uint8_t) v2) << 4) | (((uint8_t) v3) >>
2));
1423 out[j + 2] = (uint8_t) ((((uint8_t) v3) << 6) | (((uint8_t) v4)));
//……
}
In Visual Studio, the Debug mode default open /RTC1, but the Release mode
doesn’t.
As the suggestion by Visual Studio, if we modify the current git
master(mhd_str.c) to:
2375 out[j + 0] = (uint8_t) ((((uint8_t) ((((uint8_t) v1) << 2)&0xFF))
| ((uint8_t) (((uint8_t) v2) >> 4))) & 0xFF);
2377 out[j + 1] = (uint8_t) ((((uint8_t) ((((uint8_t) v2) << 4) & 0xFF))
| ((uint8_t) (((uint8_t) v3) >> 2))) & 0xFF);
2379 out[j + 2] = (uint8_t) ((((uint8_t) ((((uint8_t) v3) << 6)&0xFF))
| ((uint8_t) (((uint8_t) v4)))) & 0xFF);
The error didn'tn appear.
Otherwise, if we ignore the error, the program still works.
