func (d *Deb) validate() error {
_, err := d.f.Seek(0, 0)
if err != nil {
return &InvalidDeb{d, err}
}
rd := ar.NewReader(d.f)
hdr, err := rd.Next()
if err != nil {
return &InvalidDeb{d, err}
}
hdr.Name = strings.Trim(hdr.Name, "/")
if hdr.Name != "debian-binary" {
err := fmt.Errorf("First file in .deb must be 'debian-binary', not '%s'", hdr.Name)
return &InvalidDeb{d, err}
}
buf := make([]byte, 10)
n, err := rd.Read(buf)
if err != nil {
return &InvalidDeb{d, err}
}
version := strings.TrimSpace(string(buf[:n]))
if version != "2.0" {
err := fmt.Errorf("Only v2.0 .deb files supported, not v%s", version)
return &InvalidDeb{d, err}
}
_, err = d.f.Seek(0, 0)
if err != nil {
return &InvalidDeb{d, err}
}
return nil
}
func (d *Deb) hashSections() (string, error) {
h1 := sha1.New()
h5 := md5.New()
w := io.MultiWriter(h1, h5)
_, err := d.f.Seek(0, 0)
if err != nil {
return "", &InvalidDeb{d, err}
}
s := ""
rd := ar.NewReader(d.f)
for {
h1.Reset()
h5.Reset()
hdr, err := rd.Next()
if err == io.EOF {
return s, nil
} else if err != nil {
return "", &InvalidDeb{d, err}
}
_, err = io.Copy(w, rd)
if err != nil {
return "", &InvalidDeb{d, err}
}
h1x := hex.EncodeToString(h1.Sum(nil))
h5x := hex.EncodeToString(h5.Sum(nil))
s += fmt.Sprintf("\t%s %s %d %s\n", h5x, h1x, hdr.Size, hdr.Name)
}
}
func (d *Deb) findSection(name string) (io.Reader, error) {
_, err := d.f.Seek(0, 0)
if err != nil {
return nil, &InvalidDeb{d, err}
}
rd := ar.NewReader(d.f)
section := ""
for section != name {
hdr, err := rd.Next()
if err == io.EOF {
return nil, &NotFound{d, name}
} else if err != nil {
return nil, &InvalidDeb{d, err}
}
section = strings.Trim(hdr.Name, "/")
}
return rd, nil
}