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writer.go
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/
writer.go
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package compactcorpus
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
)
var (
errEmptyName = errors.New("name is empty")
)
type Writer struct {
size uint64
idx *os.File
dz *io.PipeWriter
chRet chan error
err error
opened bool
}
// Start creating a new corpus.
// The corpus will not be written completely until Close() is called.
func NewCorpus(filename string) (*Writer, error) {
name := root(filename)
fp, err := os.Create(name + ".index")
if err != nil {
return nil, err
}
rdr, wtr := io.Pipe()
ret := make(chan error, 1)
go func() {
err := write(rdr, name+".data.dz", 9)
ret <- err
}()
w := &Writer{
idx: fp,
dz: wtr,
chRet: ret,
opened: true,
}
return w, nil
}
func (w *Writer) Close() error {
if w.opened {
w.opened = false
w.idx.Close()
w.dz.Close()
w.err = <-w.chRet
}
return w.err
}
func (w *Writer) Write(name string, xml []byte) error {
name = strings.TrimSpace(name)
if len(name) == 0 {
return errEmptyName
}
w.dz.Write(xml)
ln := uint64(len(xml))
off := encode(w.size)
size := encode(ln)
fmt.Fprintf(w.idx, "%s\t%s\t%s\n", name, off, size)
w.size += ln
return nil
}
func (w *Writer) WriteString(name string, xml string) error {
return w.Write(name, []byte(xml))
}
func (w *Writer) WriteFile(filename string) error {
xml, err := ioutil.ReadFile(filename)
if err != nil {
return err
}
return w.Write(filename, xml)
}