func (b *Buffer) updateMeta() {
// First 8 bytes have the first frame offset,
// next 8 bytes have the last frame offset,
// next 8 bytes are the next sequence number,
// next 4 bytes are the biggest data record we've seen,
// next 8 bytes are the total data in the buffer.
off := int(b.capacity)
binary.PutLittleEndianUint64(b.data, off, b.first)
binary.PutLittleEndianUint64(b.data, off+8, b.last)
binary.PutLittleEndianUint64(b.data, off+16, b.nextSeq)
binary.PutLittleEndianUint32(b.data, off+24, b.biggest)
binary.PutLittleEndianUint64(b.data, off+28, b.length)
}
func newFrame(seq uint64, data []byte) (frame, error) {
if len(data) > int(maxBytes) {
return nil, errFrameTooBig
}
var f frame = make([]byte, len(data)+total)
binary.PutLittleEndianUint32(f, 0, uint32(len(f)))
binary.PutLittleEndianUint64(f, size, seq)
copy(f[total:], data)
return f, nil
}