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anonymize.go
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/
anonymize.go
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package anonymize
import (
"bytes"
"fmt"
"github.com/MG-RAST/Shock/shock-server/node/file"
"github.com/MG-RAST/Shock/shock-server/node/file/format/multi"
"github.com/MG-RAST/Shock/shock-server/node/file/format/seq"
"io"
)
type Reader struct {
f file.SectionReader
r seq.ReadFormater
counter int
overflow []byte
}
func NewReader(f file.SectionReader) io.Reader {
return &Reader{
f: f,
r: multi.NewReader(f),
counter: 1,
overflow: nil,
}
}
func (r *Reader) Read(p []byte) (n int, err error) {
n = 0
buf := bytes.NewBuffer(nil)
if r.overflow != nil {
ln, _ := buf.Write(r.overflow)
n += ln
}
for {
seq, er := r.r.Read()
if er != nil {
if er == io.EOF {
copy(p[0:n], buf.Bytes()[0:n])
}
err = er
break
}
seq.ID = []byte(fmt.Sprint(r.counter))
r.counter += 1
ln, _ := r.r.Format(seq, buf)
if n+ln > cap(p) {
copy(p[0:n], buf.Bytes()[0:n])
r.overflow = buf.Bytes()[n:]
break
} else {
n += ln
}
}
return
}
func (r *Reader) Close() error {
r.Close()
return nil
}