mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-27 07:26:26 +00:00
60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
package rpm
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"io"
|
|
)
|
|
|
|
// ErrNotRPMFile indicates that the file is not an rpm package.
|
|
var ErrNotRPMFile = errorf("invalid file descriptor")
|
|
|
|
// Lead is the deprecated lead section of an rpm file which is used in legacy
|
|
// rpm versions to store package metadata.
|
|
type Lead struct {
|
|
VersionMajor int
|
|
VersionMinor int
|
|
Name string
|
|
Type int
|
|
Architecture int
|
|
OperatingSystem int
|
|
SignatureType int
|
|
}
|
|
|
|
type leadBytes [96]byte
|
|
|
|
func (c leadBytes) Magic() []byte { return c[:4] }
|
|
func (c leadBytes) VersionMajor() int { return int(c[4]) }
|
|
func (c leadBytes) VersionMinor() int { return int(c[5]) }
|
|
func (c leadBytes) Type() int { return int(binary.BigEndian.Uint16(c[6:8])) }
|
|
func (c leadBytes) Architecture() int { return int(binary.BigEndian.Uint16(c[8:10])) }
|
|
func (c leadBytes) Name() string { return string(c[10:76]) }
|
|
func (c leadBytes) OperatingSystem() int { return int(binary.BigEndian.Uint16(c[76:78])) }
|
|
func (c leadBytes) SignatureType() int { return int(binary.BigEndian.Uint16(c[78:80])) }
|
|
|
|
// readLead reads the deprecated lead section of an rpm package which is used in
|
|
// legacy rpm versions to store package metadata.
|
|
func readLead(r io.Reader) (*Lead, error) {
|
|
var lead leadBytes
|
|
_, err := io.ReadFull(r, lead[:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if !bytes.Equal(lead.Magic(), []byte{0xED, 0xAB, 0xEE, 0xDB}) {
|
|
return nil, ErrNotRPMFile
|
|
}
|
|
if lead.VersionMajor() < 3 || lead.VersionMajor() > 4 {
|
|
return nil, errorf("unsupported rpm version: %d", lead.VersionMajor())
|
|
}
|
|
// TODO: validate lead value ranges
|
|
return &Lead{
|
|
VersionMajor: lead.VersionMajor(),
|
|
VersionMinor: lead.VersionMinor(),
|
|
Type: lead.Type(),
|
|
Architecture: lead.Architecture(),
|
|
Name: lead.Name(),
|
|
OperatingSystem: lead.OperatingSystem(),
|
|
SignatureType: lead.SignatureType(),
|
|
}, nil
|
|
}
|