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package util
import (
"bytes"
"encoding/binary"
"encoding/hex"
"fmt"
"strings"
)
// Defined two places
// Section 7.3 - Protocol Handler Services
// Related Definitions
// Page 176
// Appendix A - GUID and Time Formats
// Page 2272
type EFIGUID struct {
Data1 uint32
Data2 uint16
Data3 uint16
Data4 [8]uint8
}
const SizeofEFIGUID uint32 = 16
// Pretty print an EFIGUID struct
func (e *EFIGUID) Format() string {
return fmt.Sprintf("%08x-%04x-%04x-%04x-%12x", e.Data1, e.Data2, e.Data3, e.Data4[:2], e.Data4[2:])
}
func (e *EFIGUID) Bytes() []byte {
return GUIDToBytes(e)
}
// Compare two EFIGUID structs
func CmpEFIGUID(cmp1 EFIGUID, cmp2 EFIGUID) bool {
return cmp1.Data1 == cmp2.Data1 &&
cmp1.Data2 == cmp2.Data2 &&
cmp1.Data3 == cmp2.Data3 &&
cmp1.Data4 == cmp2.Data4
}
// Convert a string to an EFIGUID
func StringToGUID(s string) *EFIGUID {
decoded, _ := hex.DecodeString(strings.ReplaceAll(s, "-", ""))
return BytesToGUID(decoded)
}
// Convert a byte slice to an EFIGUID
func BytesToGUID(s []byte) *EFIGUID {
var efi EFIGUID
f := bytes.NewReader(s[:])
binary.Read(f, binary.BigEndian, &efi)
return &efi
}
// Convert an EFIGUID to a byte slice
func GUIDToBytes(g *EFIGUID) []byte {
b := new(bytes.Buffer)
for _, v := range []interface{}{g.Data1, g.Data2, g.Data3, g.Data4} {
binary.Write(b, binary.BigEndian, v)
}
return b.Bytes()
}
// Write an EFIGUID to a bytes.Buffer
func WriteGUID(b *bytes.Buffer, g *EFIGUID) {
for _, v := range []interface{}{g.Data1, g.Data2, g.Data3, g.Data4} {
binary.Write(b, binary.BigEndian, v)
}
}
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