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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
package common
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import (
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"bytes"
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"errors"
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"fmt"
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)
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// Byte order utilities
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func BytesNtohs(b []byte) uint16 {
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return uint16(b[0])<<8 | uint16(b[1])
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}
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func BytesNtohl(b []byte) uint32 {
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return uint32(b[0])<<24 | uint32(b[1])<<16 |
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uint32(b[2])<<8 | uint32(b[3])
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}
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func BytesHtohl(b []byte) uint32 {
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return uint32(b[3])<<24 | uint32(b[2])<<16 |
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uint32(b[1])<<8 | uint32(b[0])
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}
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func BytesNtohll(b []byte) uint64 {
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return uint64(b[0])<<56 | uint64(b[1])<<48 |
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uint64(b[2])<<40 | uint64(b[3])<<32 |
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uint64(b[4])<<24 | uint64(b[5])<<16 |
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uint64(b[6])<<8 | uint64(b[7])
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}
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// Ipv4_Ntoa transforms an IP4 address in it's dotted notation
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func IPv4Ntoa(ip uint32) string {
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return fmt.Sprintf("%d.%d.%d.%d",
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byte(ip>>24), byte(ip>>16),
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byte(ip>>8), byte(ip))
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}
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// ReadString extracts the first null terminated string from
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// a slice of bytes.
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func ReadString(s []byte) (string, error) {
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i := bytes.IndexByte(s, 0)
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if i < 0 {
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return "", errors.New("No string found")
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}
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res := string(s[:i])
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return res, nil
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}
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