/
rar.go
92 lines (80 loc) · 1.5 KB
/
rar.go
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package exploder
import (
"bytes"
"fmt"
"io"
"path"
"github.com/nwaples/rardecode"
"github.com/pschou/go-tease"
)
type rarFile struct {
z_reader *rardecode.Reader
hdr *rardecode.FileHeader
eof bool
}
func init() {
formatTests = append(formatTests, formatTest{
Test: testRAR,
Read: readRAR,
Type: "rar",
})
}
func testRAR(tr *tease.Reader, _ string) bool {
tr.Seek(0, io.SeekStart)
buf := make([]byte, 6)
tr.Read(buf)
tr.Seek(0, io.SeekStart)
return bytes.Compare(buf, []byte{0x52, 0x61, 0x72, 0x21, 0x1A, 0x07}) == 0
}
func readRAR(tr *tease.Reader, size int64) (archive, error) {
tr.Seek(0, io.SeekStart)
if size < 10 {
size = 2048
}
zr, err := rardecode.NewReader(tr, "")
if err != nil {
if Debug {
fmt.Println("Error reading rar", err)
}
return nil, err
}
hdr, err := zr.Next()
if err != nil {
return nil, err
}
ret := rarFile{
z_reader: zr,
eof: false,
hdr: hdr,
}
tr.Pipe()
return &ret, nil
}
func (i *rarFile) Type() string { return "rar" }
func (i *rarFile) IsEOF() bool { return i.eof }
func (c *rarFile) Close() {
//if c.z_reader != nil {
// c.z_reader.Close()
//}
}
func (i *rarFile) Next() (dir, name string, r io.Reader, size int64, err error) {
var hdr *rardecode.FileHeader
for {
if i.hdr != nil {
hdr = i.hdr
i.hdr = nil
} else {
hdr, err = i.z_reader.Next()
if err != nil {
return
}
}
if !hdr.IsDir {
break
}
}
r = i.z_reader
size = hdr.UnPackedSize
dir, name = path.Split(hdr.Name)
return
}