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