/**
* Translate a PRStream to a PdfStream. The data part copies itself.
*/
protected PdfStream CopyStream(PRStream inp)
{
PRStream outp = new PRStream(inp, null);
foreach (PdfName key in inp.Keys)
{
PdfObject value = inp.Get(key);
outp.Put(key, CopyObject(value));
}
return(outp);
}
/**
* Translate a PRStream to a PdfStream. The data part copies itself.
*/
protected PdfStream CopyStream(PRStream inp)
{
PRStream outp = new PRStream(inp, null);
foreach (PdfName key in inp.Keys)
{
PdfObject value = inp.Get(key);
parentObjects.Add(value, inp);
PdfObject res = CopyObject(value);
if ((res != null) && !(res is PdfNull))
{
outp.Put(key, res);
}
}
return(outp);
}
/**
* Translate a PRStream to a PdfStream. The data part copies itself.
*/
protected PdfStream CopyStream(PRStream inp)
{
PRStream outp = new PRStream(inp, null);
foreach (PdfName key in inp.Keys) {
PdfObject value = inp.Get(key);
outp.Put(key, CopyObject(value));
}
return outp;
}
/** Get the content from a stream as it is without applying any filter.
* @param stream the stream
* @param file the location where the stream is
* @throws IOException on error
* @return the stream content
*/
public static byte[] GetStreamBytesRaw(PRStream stream, RandomAccessFileOrArray file) {
PdfReader reader = stream.Reader;
byte[] b;
if (stream.Offset < 0)
b = stream.GetBytes();
else {
b = new byte[stream.Length];
file.Seek(stream.Offset);
file.ReadFully(b);
PdfEncryption decrypt = reader.Decrypt;
if (decrypt != null) {
PdfObject filter = GetPdfObjectRelease(stream.Get(PdfName.FILTER));
List<PdfObject> filters = new List<PdfObject>();
if (filter != null) {
if (filter.IsName())
filters.Add(filter);
else if (filter.IsArray())
filters = ((PdfArray)filter).ArrayList;
}
bool skip = false;
for (int k = 0; k < filters.Count; ++k) {
PdfObject obj = GetPdfObjectRelease(filters[k]);
if (obj != null && obj.ToString().Equals("/Crypt")) {
skip = true;
break;
}
}
if (!skip) {
decrypt.SetHashKey(stream.ObjNum, stream.ObjGen);
b = decrypt.DecryptByteArray(b);
}
}
}
return b;
}
private void CheckPRStreamLength(PRStream stream) {
long fileLength = tokens.Length;
long start = stream.Offset;
bool calc = false;
long streamLength = 0;
PdfObject obj = GetPdfObjectRelease(stream.Get(PdfName.LENGTH));
if (obj != null && obj.Type == PdfObject.NUMBER) {
streamLength = ((PdfNumber)obj).IntValue;
if (streamLength + start > fileLength - 20)
calc = true;
else {
tokens.Seek(start + streamLength);
String line = tokens.ReadString(20);
if (!line.StartsWith("\nendstream") &&
!line.StartsWith("\r\nendstream") &&
!line.StartsWith("\rendstream") &&
!line.StartsWith("endstream"))
calc = true;
}
}
else
calc = true;
if (calc) {
byte[] tline = new byte[16];
tokens.Seek(start);
long pos;
while (true) {
pos = tokens.FilePointer;
if (!tokens.ReadLineSegment(tline, false)) // added boolean because of mailing list issue (17 Feb. 2014)
break;
if (Equalsn(tline, endstream)) {
streamLength = pos - start;
break;
}
if (Equalsn(tline, endobj)) {
tokens.Seek(pos - 16);
String s = tokens.ReadString(16);
int index = s.IndexOf("endstream");
if (index >= 0)
pos = pos - 16 + index;
streamLength = pos - start;
break;
}
}
tokens.Seek(pos - 2);
if(tokens.Read() == 13)
streamLength--;
tokens.Seek(pos - 1);
if(tokens.Read() == 10)
streamLength--;
}
stream.Length = (int)streamLength;
}
/**
* Translate a PRStream to a PdfStream. The data part copies itself.
*/
protected PdfStream CopyStream(PRStream inp) {
PRStream outp = new PRStream(inp, null);
foreach (PdfName key in inp.Keys) {
PdfObject value = inp.Get(key);
parentObjects[value] = inp;
PdfObject res = CopyObject(value);
if ((res != null) && !(res is PdfNull))
outp.Put(key, res);
}
return outp;
}
private void CheckPRStreamLength(PRStream stream) {
int fileLength = tokens.Length;
int start = stream.Offset;
bool calc = false;
int streamLength = 0;
PdfObject obj = GetPdfObjectRelease(stream.Get(PdfName.LENGTH));
if (obj != null && obj.Type == PdfObject.NUMBER) {
streamLength = ((PdfNumber)obj).IntValue;
if (streamLength + start > fileLength - 20)
calc = true;
else {
tokens.Seek(start + streamLength);
String line = tokens.ReadString(20);
if (!line.StartsWith("\nendstream") &&
!line.StartsWith("\r\nendstream") &&
!line.StartsWith("\rendstream") &&
!line.StartsWith("endstream"))
calc = true;
}
}
else
calc = true;
if (calc) {
byte[] tline = new byte[16];
tokens.Seek(start);
while (true) {
int pos = tokens.FilePointer;
if (!tokens.ReadLineSegment(tline))
break;
if (Equalsn(tline, endstream)) {
streamLength = pos - start;
break;
}
if (Equalsn(tline, endobj)) {
tokens.Seek(pos - 16);
String s = tokens.ReadString(16);
int index = s.IndexOf("endstream");
if (index >= 0)
pos = pos - 16 + index;
streamLength = pos - start;
break;
}
}
}
stream.Length = streamLength;
}
private void UpdateImageStream(PRStream imageStream, byte[] newData) {
PdfImage image = new PdfImage(Image.GetInstance(newData), "", null);
if (imageStream.Contains(PdfName.SMASK)) {
image.Put(PdfName.SMASK, imageStream.Get(PdfName.SMASK));
}
if (imageStream.Contains(PdfName.MASK)) {
image.Put(PdfName.MASK, imageStream.Get(PdfName.MASK));
}
if (imageStream.Contains(PdfName.SMASKINDATA)) {
image.Put(PdfName.SMASKINDATA, imageStream.Get(PdfName.SMASKINDATA));
}
imageStream.Clear();
imageStream.PutAll(image);
imageStream.SetDataRaw(image.GetBytes());
}
/** Get the content from a stream applying the required filters.
* @param stream the stream
* @param file the location where the stream is
* @throws IOException on error
* @return the stream content
*/
public static byte[] GetStreamBytes(PRStream stream, RandomAccessFileOrArray file) {
PdfObject filter = GetPdfObjectRelease(stream.Get(PdfName.FILTER));
byte[] b = GetStreamBytesRaw(stream, file);
ArrayList filters = new ArrayList();
if (filter != null) {
if (filter.IsName())
filters.Add(filter);
else if (filter.IsArray())
filters = ((PdfArray)filter).ArrayList;
}
ArrayList dp = new ArrayList();
PdfObject dpo = GetPdfObjectRelease(stream.Get(PdfName.DECODEPARMS));
if (dpo == null || (!dpo.IsDictionary() && !dpo.IsArray()))
dpo = GetPdfObjectRelease(stream.Get(PdfName.DP));
if (dpo != null) {
if (dpo.IsDictionary())
dp.Add(dpo);
else if (dpo.IsArray())
dp = ((PdfArray)dpo).ArrayList;
}
String name;
for (int j = 0; j < filters.Count; ++j) {
name = ((PdfName)GetPdfObjectRelease((PdfObject)filters[j])).ToString();
if (name.Equals("/FlateDecode") || name.Equals("/Fl")) {
b = FlateDecode(b);
PdfObject dicParam = null;
if (j < dp.Count) {
dicParam = (PdfObject)dp[j];
b = DecodePredictor(b, dicParam);
}
}
else if (name.Equals("/ASCIIHexDecode") || name.Equals("/AHx"))
b = ASCIIHexDecode(b);
else if (name.Equals("/ASCII85Decode") || name.Equals("/A85"))
b = ASCII85Decode(b);
else if (name.Equals("/LZWDecode")) {
b = LZWDecode(b);
PdfObject dicParam = null;
if (j < dp.Count) {
dicParam = (PdfObject)dp[j];
b = DecodePredictor(b, dicParam);
}
}
else if (name.Equals("/Crypt")) {
}
else
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("the.filter.1.is.not.supported", name));
}
return b;
}
