/* Contrary to caml_md5_chan, this function releases the runtime lock.
[fd] must be a file descriptor open for reading and not be
nonblocking, otherwise the function might fail non-deterministically.
*/
CAMLprim value caml_md5_fd(value fd)
{
CAMLparam1 (fd);
value res;
struct MD5Context ctx;
caml_enter_blocking_section();
{
intnat bytes_read;
char buffer[4096];
caml_MD5Init(&ctx);
while (1){
bytes_read = read (Int_val(fd), buffer, sizeof(buffer));
if (bytes_read < 0) {
if (errno == EINTR) continue;
caml_leave_blocking_section();
uerror("caml_md5_fd", Nothing);
}
if (bytes_read == 0) break;
caml_MD5Update (&ctx, (unsigned char *) buffer, bytes_read);
}
}
caml_leave_blocking_section();
res = caml_alloc_string(16);
caml_MD5Final(&Byte_u(res, 0), &ctx);
CAMLreturn (res);
}
CAMLprim value caml_md5_init(value unit)
{
value ctx = alloc_string(sizeof(struct MD5Context));
caml_MD5Init(Context_val(ctx));
return ctx;
}
