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|
package pktline
import (
"errors"
"fmt"
"io"
"strconv"
)
var (
ErrUnderflow = errors.New("unexpected string length (underflow)")
ErrInvalidHeader = errors.New("invalid header")
ErrInvalidLen = errors.New("invalid length")
)
type Decoder struct {
r io.Reader
}
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{r}
}
func (d *Decoder) readLine() (string, error) {
raw := make([]byte, HEADER_LENGTH)
if _, err := d.r.Read(raw); err != nil {
return "", err
}
header, err := strconv.ParseInt(string(raw), 16, 16)
if err != nil {
fmt.Println(err)
return "", ErrInvalidHeader
}
if header == 0 {
return "", nil
}
exp := int(header - HEADER_LENGTH)
if exp < 0 {
return "", ErrInvalidLen
}
line := make([]byte, exp)
if read, err := d.r.Read(line); err != nil {
return "", err
} else if read != exp {
return "", ErrUnderflow
}
return string(line), nil
}
func (d *Decoder) ReadLine() (string, error) {
return d.readLine()
}
func (d *Decoder) ReadBlock() ([]string, error) {
o := make([]string, 0)
for {
line, err := d.readLine()
if err == io.EOF {
return o, nil
}
if err != nil {
return o, err
}
if err == nil && line == "" {
return o, nil
}
o = append(o, line)
}
return o, nil
}
func (d *Decoder) ReadAll() ([]string, error) {
result, err := d.ReadBlock()
if err != nil {
return result, err
}
for {
lines, err := d.ReadBlock()
if err == io.EOF {
return result, nil
}
if err != nil {
return result, err
}
if err == nil && len(lines) == 0 {
return result, nil
}
result = append(result, lines...)
}
return result, nil
}
|
