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|
package libfastimport
import (
"fmt"
"bufio"
"bytes"
"io"
"strconv"
)
type FIReader struct {
r *bufio.Reader
}
func NewFIReader(r io.Reader) *FIReader {
return &FIReader{
r: bufio.NewReader(r),
}
}
func (fir *FIReader) ReadSlice() (line []byte, err error) {
retry:
line, err = fir.r.ReadSlice('\n')
if err != nil {
return
}
if len(line) == 1 {
goto retry
}
if bytes.HasPrefix(line, []byte("data ")) {
if string(line[5:7]) == "<<" {
// Delimited format
delim := line[7 : len(line)-1]
suffix := []byte("\n" + string(delim) + "\n")
_line := make([]byte, len(line))
copy(_line, line)
line = _line
for !bytes.HasSuffix(line, suffix) {
_line, err = fir.r.ReadSlice('\n')
line = append(line, _line...)
if err != nil {
return
}
}
} else {
// Exact byte count format
var size int
size, err = strconv.Atoi(string(line[5 : len(line)-1]))
if err != nil {
return
}
_line := make([]byte, size+len(line))
copy(_line, line)
var n int
n, err = io.ReadFull(fir.r, _line[len(line):])
line = _line[:n+len(line)]
}
}
return
}
type FIWriter struct {
w io.Writer
}
func NewFIWriter(w io.Writer) *FIWriter {
return &FIWriter{
w: w,
}
}
func (fiw *FIWriter) WriteLine(a ...interface{}) error {
_, err := fmt.Fprintln(fiw.w, a...)
return err
}
func (fiw *FIWriter) WriteData(data []byte) error {
err := fiw.WriteLine("data", len(data))
if err != nil {
return err
}
_, err = fiw.w.Write(data)
return err
}
type CatBlobReader struct {
r *bufio.Reader
}
func NewCatBlobReader(r io.Reader) *CatBlobReader {
return &CatBlobReader{
r: bufio.NewReader(r),
}
}
func (cbr *CatBlobReader) ReadSlice() (line []byte, err error) {
retry:
line, err = cbr.r.ReadSlice('\n')
if err != nil {
return
}
if len(line) == 1 {
goto retry
}
// get-mark : <sha1> LF
// cat-blob : <sha1> SP 'blob' SP <size> LF <data> LF
// ls : <mode> SP ('blob' | 'tree' | 'commit') SP <dataref> HT <path> LF
// ls : 'missing' SP <path> LF
// decide if we have a cat-blob result
if len(line) <= 46 || string(line[40:46]) != " blob " {
return
}
for _, b := range line[:40] {
if !(('0' <= b && b <= '9') || ('a' <= b && b <= 'f')) {
return
}
}
// we have a cat-blob result
var size int
size, err = strconv.Atoi(string(line[46 : len(line)-1]))
if err != nil {
return
}
_line := make([]byte, len(line)+size+1)
copy(_line, line)
n, err := io.ReadFull(cbr.r, _line[len(line):])
line = _line[:n+len(line)]
return
}
|
