private int ReadAsNumber(int n_bytes)
{
byte[] buffer = new byte[n_bytes];
Read(buffer, 0, n_bytes);
int result = 0;
for (int i = 0; i < n_bytes; ++i)
{
result = (result << 8) | JavaUnsignedUtil.AsU8(buffer[i]);
}
return(result);
}
// Compute checksum over size bytes of buf
public static int ComputeULongSum(byte[] buf, int offset, int size)
{
int checksum = 0;
int aligned_size = (size & ~3);
for (int i = 0; i < aligned_size; i += 4)
{
checksum += (JavaUnsignedUtil.AsU8(buf[offset + i]) << 24) | (JavaUnsignedUtil.AsU8(buf[offset + i + 1]) <<
16) | (JavaUnsignedUtil.AsU8(buf[offset + i + 2]) << 8) | JavaUnsignedUtil.AsU8(buf[offset + i + 3]);
}
// treat size not aligned on 4 as if it were padded to 4 with 0's
if (size != aligned_size)
{
int v = 0;
for (int i = aligned_size; i < size; ++i)
{
v |= JavaUnsignedUtil.AsU8(buf[offset + i]) << (24 - 8 * (i & 3));
}
checksum += v;
}
return(checksum);
}
public virtual byte ReadByte()
{
return(JavaUnsignedUtil.ToU8(ReadAsNumber(1)));
}
public virtual short ReadShort()
{
return(JavaUnsignedUtil.ToU16(ReadAsNumber(2)));
}
public virtual int CompareTo(Woff2Common.Table o)
{
return(JavaUnsignedUtil.CompareAsUnsigned(tag, o.tag));
}