// pd.DecodedStream() returns decoded contents of a stream.
func (pd *PdfReaderT) DecodedStream(reference []byte) (DictionaryT, []byte) {
dic, data := pd.Stream(reference)
if f, ok := dic["/Filter"]; ok {
filter := pd.ForcedArray(f)
var decos [][]byte
if d, ok := dic["/DecodeParams"]; ok {
decos = pd.ForcedArray(d)
} else {
decos = make([][]byte, len(filter))
}
for ff := range filter {
deco := pd.Dic(decos[ff])
switch string(filter[ff]) {
case "/FlateDecode":
data = fancy.ReadAndClose(zlib.NewReader(fancy.SliceReader(data)))
case "/LZWDecode":
early := true
if deco != nil {
if s, ok := deco["/EarlyChange"]; ok {
early = pd.Num(s) == 1
}
}
data = lzw.Decode(data, early)
case "/ASCII85Decode":
ds := data
for len(ds) > 1 && ds[len(ds)-1] < 33 {
ds = ds[0 : len(ds)-1]
}
if len(ds) >= 2 && ds[len(ds)-1] == '>' && ds[len(ds)-2] == '~' {
ds = ds[0 : len(ds)-2]
}
data = fancy.ReadAll(ascii85.NewDecoder(fancy.SliceReader(ds)))
case "/ASCIIHexDecode":
data = hex.Decode(string(data))
default:
data = []byte{}
}
}
}
return dic, data
}
func eexec(rdr fancy.Reader) []byte {
fpos, _ := rdr.Seek(0, 1)
b := fancy.ReadAll(rdr)
cnt := 0
pos := 0
k := 0
for ; cnt < 256 && k < len(b); k++ {
switch b[k] {
case 32, 10, 13, 9:
case '0':
cnt++
default:
cnt = 0
pos = k + 1
}
}
b = b[0:pos]
rdr.Seek(fpos+int64(k), 0)
if hex.IsHex(b[0]) {
b = hex.Decode(string(b))
}
return T1Decrypt(EEXEC_KEY, b)[4:]
}
