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