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package maxminddb
type nodeReader interface {
readLeft(uint) uint
readRight(uint) uint
}
type nodeReader24 struct {
buffer []byte
}
func (n nodeReader24) readLeft(nodeNumber uint) uint {
return (uint(n.buffer[nodeNumber]) << 16) |
(uint(n.buffer[nodeNumber+1]) << 8) |
uint(n.buffer[nodeNumber+2])
}
func (n nodeReader24) readRight(nodeNumber uint) uint {
return (uint(n.buffer[nodeNumber+3]) << 16) |
(uint(n.buffer[nodeNumber+4]) << 8) |
uint(n.buffer[nodeNumber+5])
}
type nodeReader28 struct {
buffer []byte
}
func (n nodeReader28) readLeft(nodeNumber uint) uint {
return ((uint(n.buffer[nodeNumber+3]) & 0xF0) << 20) |
(uint(n.buffer[nodeNumber]) << 16) |
(uint(n.buffer[nodeNumber+1]) << 8) |
uint(n.buffer[nodeNumber+2])
}
func (n nodeReader28) readRight(nodeNumber uint) uint {
return ((uint(n.buffer[nodeNumber+3]) & 0x0F) << 24) |
(uint(n.buffer[nodeNumber+4]) << 16) |
(uint(n.buffer[nodeNumber+5]) << 8) |
uint(n.buffer[nodeNumber+6])
}
type nodeReader32 struct {
buffer []byte
}
func (n nodeReader32) readLeft(nodeNumber uint) uint {
return (uint(n.buffer[nodeNumber]) << 24) |
(uint(n.buffer[nodeNumber+1]) << 16) |
(uint(n.buffer[nodeNumber+2]) << 8) |
uint(n.buffer[nodeNumber+3])
}
func (n nodeReader32) readRight(nodeNumber uint) uint {
return (uint(n.buffer[nodeNumber+4]) << 24) |
(uint(n.buffer[nodeNumber+5]) << 16) |
(uint(n.buffer[nodeNumber+6]) << 8) |
uint(n.buffer[nodeNumber+7])
}
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