int read_bsd_byte(int *count = NULL, int *sum = NULL) {
char c;
if (file.read(&c, 1) != 1)
throw TruncatedRead();
if (sum)
*sum += (0xff & c);
if (count)
*count += 1;
return (0xff & c) - (int(c/16)*6);
}
int read_bytes(int len, int *count = NULL, int *sum = NULL) {
char c;
int res = 0;
for (int i = 0; i < len; ++i) {
if (file.read(&c, 1) != 1)
throw TruncatedRead();
if (sum)
*sum += (0xff & c);
if (count)
*count += 1;
res += pow(256,i) * (0xff & c);
}
return res;
}
QString read_text(int len, int *count = NULL, int *sum = NULL)
{
char c;
QString res = "";
for (int i = 0; i < len; ++i) {
if (file.read(&c, 1) != 1)
throw TruncatedRead();
if (sum)
*sum += (0xff & c);
if (count)
*count += 1;
res += c;
}
return res;
}
int read_bytes(int len, int *count = NULL, int *sum = NULL, bool issigned = false) {
char c;
int res = 0;
for (int i = 0; i < len; ++i) {
if (file.read(&c, 1) != 1)
throw TruncatedRead();
if (sum)
*sum += (0xff & c);
if (count)
*count += 1;
res += pow(256,i) * (0xff & (unsigned) c) ;
if (issigned && i == len-1)
res = res - (0x80 & (unsigned) c) * 2 ;
}
return res;
}