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entry32.go
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entry32.go
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// Copyright 2016-2019 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package smbios
import (
"bytes"
"encoding/binary"
"fmt"
)
// Entry32 is the SMBIOS 32-Bit entry point structure, described in DSP0134 5.2.1.
type Entry32 struct {
Anchor [4]uint8
Checksum uint8
Length uint8
SMBIOSMajorVersion uint8
SMBIOSMinorVersion uint8
StructMaxSize uint16
Revision uint8
Reserved [5]uint8
IntAnchor [5]uint8
IntChecksum uint8
StructTableLength uint16
StructTableAddr uint32
NumberOfStructs uint16
BCDRevision uint8
}
// UnmarshalBinary unmarshals the SMBIOS 32-Bit entry point structure from binary data.
func (e *Entry32) UnmarshalBinary(data []byte) error {
if len(data) < 0x1f {
return fmt.Errorf("invalid entry point stucture length %d", len(data))
}
if err := binary.Read(bytes.NewReader(data), binary.LittleEndian, e); err != nil {
return err
}
if !bytes.Equal(e.Anchor[:], []byte("_SM_")) {
return fmt.Errorf("invalid anchor string %q", string(e.Anchor[:]))
}
if int(e.Length) != 0x1f {
return fmt.Errorf("length mismatch: %d vs %d", e.Length, len(data))
}
cs := calcChecksum(data[:e.Length], 4)
if e.Checksum != cs {
return fmt.Errorf("checksum mismatch: 0x%02x vs 0x%02x", e.Checksum, cs)
}
if !bytes.Equal(e.IntAnchor[:], []byte("_DMI_")) {
return fmt.Errorf("invalid intermediate anchor string %q", string(e.Anchor[:]))
}
intCs := calcChecksum(data[0x10:0x1f], 5)
if e.IntChecksum != intCs {
return fmt.Errorf("intermediate checksum mismatch: 0x%02x vs 0x%02x", e.IntChecksum, intCs)
}
return nil
}
// MarshalBinary marshals the SMBIOS 32-Bit entry point structure to binary data.
func (e *Entry32) MarshalBinary() ([]byte, error) {
buf := bytes.NewBuffer(nil)
if err := binary.Write(buf, binary.LittleEndian, e); err != nil {
return nil, err
}
// Adjust checksums.
data := buf.Bytes()
data[0x15] = calcChecksum(data[0x10:0x1f], 5)
data[4] = calcChecksum(data, 4)
return data, nil
}