Java Utililty Methods ByteBuffer Read

while (dst.remaining() > 0) {
    if (-1 == src.read(dst, position + dst.position())) {
        throw new EOFException();

byte b0 = data.get();
byte b1 = data.get();
int mantissa = unsignedToSigned((b0 & 0xFF) + ((b1 & 0x0F) << 8), 12);
int exponent = unsignedToSigned((b1 & 0xFF) >> 4, 4);
return (float) (mantissa * Math.pow(10, exponent));

byte[] bytes = new byte[nrBytes];
for (int i = bytes.length - 1; i >= 0; i--) {
    bytes[i] = buffer.get();
return toHexString(bytes);

int bits = readUInt16(bb);
StringBuilder result = new StringBuilder();
for (int i = 0; i < 3; i++) {
    int c = (bits >> (2 - i) * 5) & 0x1f;
    result.append((char) (c + 0x60));
return result.toString();

while (off < len) {
    s[off++] = (char) (0x30A0 + (b.get() & 0xff));

switch (nls) {
case 1:
    return dup.get() & 0xff;
case 2:
    return dup.getShort() & 0xffff;
case 3:
    return ((dup.getShort() & 0xffff) << 8) | (dup.get() & 0xff);
case 4:
...

byte[] data = new byte[8];
bb.get(data);
long l1 = (((long) data[0] & 0xff) << 0) | (((long) data[1] & 0xff) << 8) | (((long) data[2] & 0xff) << 16)
        | (((long) data[3] & 0xff) << 24);
long l2 = (((long) data[4] & 0xff) << 0) | (((long) data[5] & 0xff) << 8) | (((long) data[6] & 0xff) << 16)
        | (((long) data[7] & 0xff) << 24);
return (l1 << 0) | (l2 << 32);

return ((long) bb.getInt() & 0xffffffffL);

char ch;
int num = 0;
while (buf.remaining() > 0) {
    ch = (char) buf.get();
    num++;
    if (ch == '\n')
        break;
return num;

return readNullTerminatedString(buf, UTF_8);