/
read.go
85 lines (75 loc) · 1.66 KB
/
read.go
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package odf
import (
"archive/zip"
"errors"
"io"
"io/ioutil"
"strings"
)
const (
MimeTypePfx = "application/vnd.oasis.opendocument."
)
type File struct {
*zip.Reader
cl io.Closer
MimeType string
}
// Open an OpenDocument file for reading, and check its MIME type.
// The returned *File provides -- via its Open method -- access to
// files embedded in the ODF, like content.xml.
func Open(odfName string) (*File, error) {
z, err := zip.OpenReader(odfName)
if err != nil {
return nil, err
}
return newFile(&z.Reader, z)
}
// NewReader initializes a File struct with an already opened ODF
// file, and checks the file's MIME type. The returned *File provides
// access to files embedded in the ODF file, like content.xml.
func NewReader(r io.ReaderAt, size int64) (*File, error) {
z, err := zip.NewReader(r, size)
if err != nil {
return nil, err
}
return newFile(z, nil)
}
func newFile(z *zip.Reader, closer io.Closer) (*File, error) {
f := new(File)
f.Reader = z
mf, err := f.Open("mimetype")
if err != nil {
if closer != nil {
closer.Close()
}
return nil, err
}
b, err := ioutil.ReadAll(mf)
mf.Close()
if err != nil {
if closer != nil {
closer.Close()
}
return nil, err
}
f.MimeType = string(b)
f.cl = closer
if !strings.HasPrefix(f.MimeType, MimeTypePfx) {
return nil, errors.New("not an Open Document mime type")
}
return f, nil
}
func (f *File) Close() error {
if f.cl == nil {
return nil
}
return f.cl.Close()
}
func (f *File) Open(name string) (io.ReadCloser, error) {
for _, zf := range f.File {
if zf.Name == name {
return zf.Open()
}
}
return nil, errors.New("odf: open " + name + ": no such file")
}