/**
* Parses an inline image from the provided content parser. The parser must be positioned immediately following the BI operator in the content stream.
* The parser will be left with current position immediately following the EI operator that terminates the inline image
* @param ps the content parser to use for reading the image.
* @return the parsed image
* @throws IOException if anything goes wring with the parsing
* @throws InlineImageParseException if parsing of the inline image failed due to issues specific to inline image processing
*/
public static PdfImageObject ParseInlineImage(PdfContentParser ps, PdfDictionary colorSpaceDic)
{
PdfDictionary inlineImageDictionary = ParseInlineImageDictionary(ps);
byte[] samples = ParseInlineImageSamples(inlineImageDictionary, colorSpaceDic, ps);
return(new PdfImageObject(inlineImageDictionary, samples));
}
public byte[] Modify(byte[] contentBytes, PdfDictionary resourcesDictionary)
{
_contentStreamBuilderStack.Push(new PdfContentStreamBuilder());
_resourceDictionaryStack.Push(resourcesDictionary);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral oper = (PdfLiteral)operands[operands.Count - 1];
//System.Diagnostics.Debug.WriteLine("[Debug] Opr: " + oper.ToString());
PdfContentOperatorHandler operHandler = null;
if (_operators.TryGetValue(oper.ToString(), out operHandler))
{
operands = operHandler(oper, operands);
}
_contentStreamBuilderStack.Peek().Push(operands);
}
_resourceDictionaryStack.Pop();
return(_contentStreamBuilderStack.Pop().GetBytes());
}
/**
* Processes PDF syntax.
* <b>Note:</b> If you re-use a given {@link PdfContentStreamProcessor}, you must call {@link PdfContentStreamProcessor#reset()}
* @param contentBytes the bytes of a content stream
* @param resources the resources that come with the content stream
*/
public void ProcessContent(byte[] contentBytes, PdfDictionary resources)
{
this.resources.Push(resources);
PRTokeniser tokeniser = new PRTokeniser(contentBytes);
PdfContentParser ps = new PdfContentParser(tokeniser);
List <iTextSharp.text.pdf.PdfObject> operands = new List <iTextSharp.text.pdf.PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral oper = (PdfLiteral)operands[operands.Count - 1];
// w.GetOperatorInfo(oper)
//w.wr.Print("operator info {0} type {1} string {2}", oper.GetType().ToString(), oper.Type, oper.ToString());
if ("BI".Equals(oper.ToString()))
{
// we don't call invokeOperator for embedded images - this is one area of the PDF spec that is particularly nasty and inconsistent
PdfDictionary colorSpaceDic = resources != null?resources.GetAsDict(PdfName.COLORSPACE) : null;
// 'iTextSharp.text.pdf.parser.ImageRenderInfo.CreateForEmbeddedImage(iTextSharp.text.pdf.parser.Matrix, iTextSharp.text.pdf.parser.InlineImageInfo, iTextSharp.text.pdf.PdfDictionary)' is inaccessible due to its protection level
ImageRenderInfo renderInfo = ImageRenderInfo.CreateForEmbeddedImage(Gs().ctm, InlineImageUtils.ParseInlineImage(ps, colorSpaceDic), colorSpaceDic);
renderListener.RenderImage(renderInfo);
}
else
{
InvokeOperator(oper, operands);
}
}
this.resources.Pop();
}
/**
* Processes PDF syntax.
* <b>Note:</b> If you re-use a given {@link PdfContentStreamProcessor}, you must call {@link PdfContentStreamProcessor#reset()}
* @param contentBytes the bytes of a content stream
* @param resources the resources that come with the content stream
*/
public void ProcessContent(byte[] contentBytes, PdfDictionary resources)
{
this.resources.Push(resources);
PRTokeniser tokeniser = new PRTokeniser(contentBytes);
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral oper = (PdfLiteral)operands[operands.Count - 1];
if ("BI".Equals(oper.ToString()))
{
// we don't call invokeOperator for embedded images - this is one area of the PDF spec that is particularly nasty and inconsistent
PdfDictionary colorSpaceDic = resources != null?resources.GetAsDict(PdfName.COLORSPACE) : null;
ImageRenderInfo renderInfo = ImageRenderInfo.CreateForEmbeddedImage(Gs().ctm, InlineImageUtils.ParseInlineImage(ps, colorSpaceDic), colorSpaceDic);
renderListener.RenderImage(renderInfo);
}
else
{
InvokeOperator(oper, operands);
}
}
this.resources.Pop();
}
/**
* Parses an inline image from the provided content parser. The parser must be positioned immediately following the BI operator in the content stream.
* The parser will be left with current position immediately following the EI operator that terminates the inline image
* @param ps the content parser to use for reading the image.
* @return the parsed image
* @throws IOException if anything goes wring with the parsing
* @throws InlineImageParseException if parsing of the inline image failed due to issues specific to inline image processing
*/
public static InlineImageInfo ParseInlineImage(PdfContentParser ps, PdfDictionary colorSpaceDic)
{
PdfDictionary inlineImageDictionary = ParseInlineImageDictionary(ps);
byte[] samples = ParseInlineImageSamples(inlineImageDictionary, colorSpaceDic, ps);
return(new InlineImageInfo(samples, inlineImageDictionary));
}
/**
* Parses the next inline image dictionary from the parser. The parser must be positioned immediately following the EI operator.
* The parser will be left with position immediately following the whitespace character that follows the ID operator that ends the inline image dictionary.
* @param ps the parser to extract the embedded image information from
* @return the dictionary for the inline image, with any abbreviations converted to regular image dictionary keys and values
* @throws IOException if the parse fails
*/
private static PdfDictionary ParseInlineImageDictionary(PdfContentParser ps)
{
// by the time we get to here, we have already parsed the BI operator
PdfDictionary dictionary = new PdfDictionary();
for (PdfObject key = ps.ReadPRObject(); key != null && !"ID".Equals(key.ToString()); key = ps.ReadPRObject())
{
PdfObject value = ps.ReadPRObject();
PdfName resolvedKey;
inlineImageEntryAbbreviationMap.TryGetValue((PdfName)key, out resolvedKey);
if (resolvedKey == null)
{
resolvedKey = (PdfName)key;
}
dictionary.Put(resolvedKey, GetAlternateValue(resolvedKey, value));
}
int ch = ps.GetTokeniser().Read();
if (!PRTokeniser.IsWhitespace(ch))
{
throw new IOException("Unexpected character " + ch + " found after ID in inline image");
}
return(dictionary);
}
/**
* Parses the samples of the image from the underlying content parser, ignoring all filters.
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
* The parser will be left positioned immediately following the EI operator.
* This is primarily useful if no filters have been applied.
* @param imageDictionary the dictionary of the inline image
* @param ps the content parser
* @return the samples of the image
* @throws IOException if anything bad happens during parsing
*/
private static byte[] ParseUnfilteredSamples(PdfDictionary imageDictionary, PdfContentParser ps)
{
// special case: when no filter is specified, we just read the number of bits
// per component, multiplied by the width and height.
if (imageDictionary.Contains(PdfName.FILTER))
{
throw new ArgumentException("Dictionary contains filters");
}
PdfNumber h = imageDictionary.GetAsNumber(PdfName.HEIGHT);
int bytesToRead = ComputeBytesPerRow(imageDictionary) * h.IntValue;
byte[] bytes = new byte[bytesToRead];
PRTokeniser tokeniser = ps.GetTokeniser();
int shouldBeWhiteSpace = tokeniser.Read(); // skip next character (which better be a whitespace character - I suppose we could check for this)
// from the PDF spec: Unless the image uses ASCIIHexDecode or ASCII85Decode as one of its filters, the ID operator shall be followed by a single white-space character, and the next character shall be interpreted as the first byte of image data.
// unfortunately, we've seen some PDFs where there is no space following the ID, so we have to capture this case and handle it
int startIndex = 0;
if (!PRTokeniser.IsWhitespace(shouldBeWhiteSpace))
{
bytes[0] = (byte)shouldBeWhiteSpace;
startIndex++;
}
for (int i = startIndex; i < bytesToRead; i++)
{
int ch = tokeniser.Read();
if (ch == -1)
{
throw new InlineImageParseException("End of content stream reached before end of image data");
}
bytes[i] = (byte)ch;
}
PdfObject ei = ps.ReadPRObject();
if (!ei.ToString().Equals("EI"))
{
throw new InlineImageParseException("EI not found after end of image data");
}
return(bytes);
}
/// <summary>
/// Parses a stream object and removes OCGs. </summary>
/// <param name="stream"> a stream object </param>
/// <param name="resources"> the resources dictionary of that object (containing info about the OCGs) </param>
public virtual void Parse(PRStream stream, PdfDictionary resources)
{
baos = new MemoryStream();
properties = resources.GetAsDict(PdfName.PROPERTIES);
xobj = new HashSet2 <PdfName>();
PdfDictionary xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects != null)
{
// remove XObject (form or image) that belong to an OCG that needs to be removed
foreach (PdfName name in xobjects.Keys)
{
PRStream xobject = (PRStream)xobjects.GetAsStream(name);
PdfDictionary oc = xobject.GetAsDict(PdfName.OC);
if (oc != null)
{
PdfString ocname = oc.GetAsString(PdfName.NAME);
if (ocname != null && ocgs.Contains(ocname.ToString()))
{
xobj.Add(name);
}
}
}
foreach (PdfName name in xobj)
{
xobjects.Remove(name);
}
}
// parse the content stream
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral @operator = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(this, @operator, operands);
}
baos.Flush();
baos.Close();
stream.SetData(baos.GetBuffer());
}
static void Main(string[] args)
{
var reader = new PdfReader(@"D:\Tmp\sample.pdf");
try
{
var parser = new PdfContentParser(new PRTokeniser(reader.GetPageContent(2)));
var sb = new StringBuilder();
while (parser.Tokeniser.NextToken())
{
if (parser.Tokeniser.TokenType == PRTokeniser.TK_STRING)
{
string str = parser.Tokeniser.StringValue;
sb.Append(str);
}
}
Console.WriteLine(sb.ToString());
}
finally {
reader.Close();
}
}
public static PdfData ConvertToPdfData(string fileName, int pageNum)
{
if ((string.IsNullOrEmpty(fileName) || string.IsNullOrWhiteSpace(fileName)) && pageNum <= 0)
{
return(null);
}
Helpers.D.Log("PdfConvertIText.ConvertToPdfData({0}, {1})", fileName, pageNum);
PdfData data = new PdfData();
PdfContentParser parser;// = new PdfContentParser();
PRTokeniser tokeniser = new PRTokeniser(fileName);
PdfDictionary dict;
ArrayList items;
parser = new PdfContentParser(tokeniser);
dict = parser.ReadDictionary();
//dict.Contains(PdfName.IMAGE)
items = parser.Parse(parser.ReadArray().ArrayList);
Helpers.D.Log("PdfConvertIText.ConvertToPdfData: {0} | {1}", items.Count, string.Join(", ", items.ToArray()));
return(data);
}
/**
* Parses the samples of the image from the underlying content parser, ignoring all filters.
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
* The parser will be left positioned immediately following the EI operator.
* This is primarily useful if no filters have been applied.
* @param imageDictionary the dictionary of the inline image
* @param ps the content parser
* @return the samples of the image
* @throws IOException if anything bad happens during parsing
*/
private static byte[] ParseUnfilteredSamples(PdfDictionary imageDictionary, PdfContentParser ps)
{
// special case: when no filter is specified, we just read the number of bits
// per component, multiplied by the width and height.
if (imageDictionary.Contains(PdfName.FILTER))
{
throw new ArgumentException("Dictionary contains filters");
}
PdfNumber h = imageDictionary.GetAsNumber(PdfName.HEIGHT);
int bytesToRead = ComputeBytesPerRow(imageDictionary) * h.IntValue;
byte[] bytes = new byte[bytesToRead];
PRTokeniser tokeniser = ps.GetTokeniser();
tokeniser.Read(); // skip next character (which better be a whitespace character - I suppose we could check for this)
for (int i = 0; i < bytesToRead; i++)
{
int ch = tokeniser.Read();
if (ch == -1)
{
throw new InlineImageParseException("End of content stream reached before end of image data");
}
bytes[i] = (byte)ch;
}
PdfObject ei = ps.ReadPRObject();
if (!ei.ToString().Equals("EI"))
{
throw new InlineImageParseException("EI not found after end of image data");
}
return(bytes);
}
/**
* Parses the samples of the image from the underlying content parser, ignoring all filters.
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
* The parser will be left positioned immediately following the EI operator.
* This is primarily useful if no filters have been applied.
* @param imageDictionary the dictionary of the inline image
* @param ps the content parser
* @return the samples of the image
* @throws IOException if anything bad happens during parsing
*/
private static byte[] ParseUnfilteredSamples(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic, PdfContentParser ps) {
// special case: when no filter is specified, we just read the number of bits
// per component, multiplied by the width and height.
if (imageDictionary.Contains(PdfName.FILTER))
throw new ArgumentException("Dictionary contains filters");
PdfNumber h = imageDictionary.GetAsNumber(PdfName.HEIGHT);
int bytesToRead = ComputeBytesPerRow(imageDictionary, colorSpaceDic) * h.IntValue;
byte[] bytes = new byte[bytesToRead];
PRTokeniser tokeniser = ps.GetTokeniser();
int shouldBeWhiteSpace = tokeniser.Read(); // skip next character (which better be a whitespace character - I suppose we could check for this)
// from the PDF spec: Unless the image uses ASCIIHexDecode or ASCII85Decode as one of its filters, the ID operator shall be followed by a single white-space character, and the next character shall be interpreted as the first byte of image data.
// unfortunately, we've seen some PDFs where there is no space following the ID, so we have to capture this case and handle it
int startIndex = 0;
if (!PRTokeniser.IsWhitespace(shouldBeWhiteSpace) || shouldBeWhiteSpace == 0){ // tokeniser treats 0 as whitespace, but for our purposes, we shouldn't)
bytes[0] = (byte)shouldBeWhiteSpace;
startIndex++;
}
for (int i = startIndex; i < bytesToRead; i++){
int ch = tokeniser.Read();
if (ch == -1)
throw new InlineImageParseException("End of content stream reached before end of image data");
bytes[i] = (byte)ch;
}
PdfObject ei = ps.ReadPRObject();
if (!ei.ToString().Equals("EI"))
throw new InlineImageParseException("EI not found after end of image data");
return bytes;
}
/**
* Processes PDF syntax
* @param contentBytes the bytes of a content stream
* @param resources the resources that come with the content stream
*/
public void ProcessContent(byte[] contentBytes, PdfDictionary resources)
{
this.resources.Push(resources);
PRTokeniser tokeniser = new PRTokeniser(contentBytes);
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral oper = (PdfLiteral)operands[operands.Count - 1];
// special handling for embedded images. If we hit an ID oper, we need
// to skip all content until we reach an EI oper surrounded by whitespace.
// The following algorithm has one potential issue: what if the image stream
// contains <ws>EI<ws> ?
// it sounds like we would have to actually decode the content stream, which
// I'd rather avoid right now.
if ("ID".Equals(oper.ToString()))
{
MemoryStream baos = new MemoryStream();
MemoryStream accumulated = new MemoryStream();
int ch;
int found = 0;
while ((ch = tokeniser.Read()) != -1)
{
if (found == 0 && PRTokeniser.IsWhitespace(ch))
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 1 && ch == 'E')
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 2 && ch == 'I')
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 3 && PRTokeniser.IsWhitespace(ch))
{
operands = new List <PdfObject>();
operands.Add(new PdfLiteral("ID"));
InvokeOperator((PdfLiteral)operands[operands.Count - 1], operands);
// we should probably eventually do something to make the accumulated image content stream available
operands = new List <PdfObject>();
operands.Add(new PdfLiteral("EI"));
InvokeOperator((PdfLiteral)operands[operands.Count - 1], operands);
break;
}
else
{
accumulated.WriteTo(baos);
accumulated.SetLength(0);
baos.WriteByte((byte)ch);
found = 0;
}
}
}
InvokeOperator(oper, operands);
}
this.resources.Pop();
}
/// <summary>
/// Parses a stream object and removes OCGs. </summary>
/// <param name="stream"> a stream object </param>
/// <param name="resources"> the resources dictionary of that object (containing info about the OCGs) </param>
public virtual void Parse(PRStream stream, PdfDictionary resources)
{
baos = new MemoryStream();
properties = resources.GetAsDict(PdfName.PROPERTIES);
xobj = new HashSet2 <PdfName>();
PdfDictionary xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects != null)
{
// remove XObject (form or image) that belong to an OCG that needs to be removed
foreach (PdfName name in xobjects.Keys)
{
PRStream xobject = (PRStream)xobjects.GetAsStream(name);
PdfDictionary oc = xobject.GetAsDict(PdfName.OC);
if (oc != null)
{
PdfString ocname = oc.GetAsString(PdfName.NAME);
if (ocname != null && ocgs.Contains(ocname.ToString()))
{
xobj.Add(name);
}
}
}
foreach (PdfName name in xobj)
{
xobjects.Remove(name);
}
}
// parse the content stream
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral @operator = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(this, @operator, operands);
if ("BI".Equals(@operator.ToString()))
{
int found = 0;
int ch;
bool immediateAfterBI = true;
while ((ch = tokeniser.Read()) != -1)
{
if (!immediateAfterBI || !PRTokeniser.IsWhitespace(ch))
{
baos.WriteByte((byte)ch);
}
immediateAfterBI = false;
if (found == 0 && PRTokeniser.IsWhitespace(ch))
{
found++;
}
else if (found == 1 && ch == 'E')
{
found++;
}
else if (found == 1 && PRTokeniser.IsWhitespace(ch))
{
// this clause is needed if we have a white space character that is part of the image data
// followed by a whitespace character that precedes the EI operator. In this case, we need
// to flush the first whitespace, then treat the current whitespace as the first potential
// character for the end of stream check. Note that we don't increment 'found' here.
}
else if (found == 2 && ch == 'I')
{
found++;
}
else if (found == 3 && PRTokeniser.IsWhitespace(ch))
{
break;
}
else
{
found = 0;
}
}
}
}
baos.Flush();
baos.Close();
stream.SetData(baos.GetBuffer());
}
private static void ParseCid(String cmapName, AbstractCMap cmap, ICidLocation location, int level)
{
if (level >= MAXLEVEL)
{
return;
}
PRTokeniser inp = location.GetLocation(cmapName);
try {
List <PdfObject> list = new List <PdfObject>();
PdfContentParser cp = new PdfContentParser(inp);
int maxExc = 50;
while (true)
{
try {
cp.Parse(list);
}
catch {
if (--maxExc < 0)
{
break;
}
continue;
}
if (list.Count == 0)
{
break;
}
String last = list[list.Count - 1].ToString();
if (level == 0 && list.Count == 3 && last.Equals(DEF))
{
PdfObject key = list[0];
if (PdfName.REGISTRY.Equals(key))
{
cmap.Registry = list[1].ToString();
}
else if (PdfName.ORDERING.Equals(key))
{
cmap.Ordering = list[1].ToString();
}
else if (CMAPNAME.Equals(key))
{
cmap.Name = list[1].ToString();
}
else if (PdfName.SUPPLEMENT.Equals(key))
{
try {
cmap.Supplement = ((PdfNumber)list[1]).IntValue;
}
catch {}
}
}
else if ((last.Equals(ENDCIDCHAR) || last.Equals(ENDBFCHAR)) && list.Count >= 3)
{
int lmax = list.Count - 2;
for (int k = 0; k < lmax; k += 2)
{
if (list[k] is PdfString)
{
cmap.AddChar((PdfString)list[k], list[k + 1]);
}
}
}
else if ((last.Equals(ENDCIDRANGE) || last.Equals(ENDBFRANGE)) && list.Count >= 4)
{
int lmax = list.Count - 3;
for (int k = 0; k < lmax; k += 3)
{
if (list[k] is PdfString && list[k + 1] is PdfString)
{
cmap.AddRange((PdfString)list[k], (PdfString)list[k + 1], list[k + 2]);
}
}
}
else if (last.Equals(USECMAP) && list.Count == 2 && list[0] is PdfName)
{
ParseCid(PdfName.DecodeName(list[0].ToString()), cmap, location, level + 1);
}
}
}
finally {
inp.Close();
}
}
/**
* Processes PDF syntax.
* <b>Note:</b> If you re-use a given {@link PdfContentStreamProcessor}, you must call {@link PdfContentStreamProcessor#reset()}
* @param contentBytes the bytes of a content stream
* @param resources the resources that come with the content stream
*/
public void ProcessContent(byte[] contentBytes, PdfDictionary resources){
this.resources.Push(resources);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(new RandomAccessSourceFactory().CreateSource(contentBytes)));
PdfContentParser ps = new PdfContentParser(tokeniser);
List<PdfObject> operands = new List<PdfObject>();
while (ps.Parse(operands).Count > 0){
PdfLiteral oper = (PdfLiteral)operands[operands.Count-1];
if ("BI".Equals(oper.ToString())){
// we don't call invokeOperator for embedded images - this is one area of the PDF spec that is particularly nasty and inconsistent
PdfDictionary colorSpaceDic = resources != null ? resources.GetAsDict(PdfName.COLORSPACE) : null;
HandleInlineImage(InlineImageUtils.ParseInlineImage(ps, colorSpaceDic), colorSpaceDic);
} else {
InvokeOperator(oper, operands);
}
}
this.resources.Pop();
}
/**
* Parses the content of a page, replacing appearances of annotations
* with Form XObjects.
* @param page a page dictionary
* @throws IOException
*/
virtual public void Parse(PdfDictionary page, PdfIndirectReference pageref) {
LOGGER.Info("Parsing page with reference " + pageref);
// initializing member variables
baos = new MemoryStream();
this.page = page;
this.pageref = pageref;
structParents = page.GetAsNumber(PdfName.STRUCTPARENTS);
if(structParents == null)
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
annots = page.GetAsArray(PdfName.ANNOTS);
if(annots == null)
annots = new PdfArray();
PdfDictionary resources = page.GetAsDict(PdfName.RESOURCES);
xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects == null) {
xobjects = new PdfDictionary();
resources.Put(PdfName.XOBJECT, xobjects);
}
// parsing the content stream of the page
PRStream stream = (PRStream) page.GetAsStream(PdfName.CONTENTS);
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(RASFACTORY.CreateSource(contentBytes)));
PdfContentParser ps = new PdfContentParser(tokeniser);
List<PdfObject> operands = new List<PdfObject>();
while (ps.Parse(operands).Count > 0) {
PdfLiteral opr = (PdfLiteral) operands[operands.Count - 1];
ProcessOperator(opr, operands);
}
// dealing with orphans
while (items.Count > 0 && items[0].GetPageref() == pageref.Number) {
StructureItem item = items[0];
if (item is StructureObject) {
ConvertToXObject((StructureObject) item);
items.RemoveAt(0);
}
}
if(annots.Length == 0) {
page.Remove(PdfName.ANNOTS);
}
else {
PdfDictionary annot;
for(int i = 0; i < annots.Size; i++) {
annot = annots.GetAsDict(i);
if(annot.GetAsNumber(PdfName.STRUCTPARENT) == null)
throw new DocumentException(MessageLocalization.GetComposedMessage("could.not.flatten.file.untagged.annotations.found"));
}
}
// replacing the content stream
baos.Flush();
baos.Close();
stream.SetData(baos.ToArray());
// showing how many items are left
LOGGER.Info(String.Format("There are {0} items left for processing", items.Count));
}
/**
* Parses an inline image from the provided content parser. The parser must be positioned immediately following the BI operator in the content stream.
* The parser will be left with current position immediately following the EI operator that terminates the inline image
* @param ps the content parser to use for reading the image.
* @return the parsed image
* @throws IOException if anything goes wring with the parsing
* @throws InlineImageParseException if parsing of the inline image failed due to issues specific to inline image processing
*/
public static InlineImageInfo ParseInlineImage(PdfContentParser ps, PdfDictionary colorSpaceDic) {
PdfDictionary inlineImageDictionary = ParseInlineImageDictionary(ps);
byte[] samples = ParseInlineImageSamples(inlineImageDictionary, colorSpaceDic, ps);
return new InlineImageInfo(samples, inlineImageDictionary);
}
/**
* Parses the next inline image dictionary from the parser. The parser must be positioned immediately following the EI operator.
* The parser will be left with position immediately following the whitespace character that follows the ID operator that ends the inline image dictionary.
* @param ps the parser to extract the embedded image information from
* @return the dictionary for the inline image, with any abbreviations converted to regular image dictionary keys and values
* @throws IOException if the parse fails
*/
private static PdfDictionary ParseInlineImageDictionary(PdfContentParser ps) {
// by the time we get to here, we have already parsed the BI operator
PdfDictionary dictionary = new PdfDictionary();
for (PdfObject key = ps.ReadPRObject(); key != null && !"ID".Equals(key.ToString()); key = ps.ReadPRObject()){
PdfObject value = ps.ReadPRObject();
PdfName resolvedKey;
inlineImageEntryAbbreviationMap.TryGetValue((PdfName)key, out resolvedKey);
if (resolvedKey == null)
resolvedKey = (PdfName)key;
dictionary.Put(resolvedKey, GetAlternateValue(resolvedKey, value));
}
int ch = ps.GetTokeniser().Read();
if (!PRTokeniser.IsWhitespace(ch))
throw new IOException("Unexpected character " + ch + " found after ID in inline image");
return dictionary;
}
/**
* Parses the samples of the image from the underlying content parser, accounting for filters
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
* The parser will be left positioned immediately following the EI operator.
* <b>Note:</b>This implementation does not actually apply the filters at this time
* @param imageDictionary the dictionary of the inline image
* @param ps the content parser
* @return the samples of the image
* @throws IOException if anything bad happens during parsing
*/
private static byte[] ParseInlineImageSamples(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic, PdfContentParser ps)
{
// by the time we get to here, we have already parsed the ID operator
if (!imageDictionary.Contains(PdfName.FILTER))
{
return(ParseUnfilteredSamples(imageDictionary, colorSpaceDic, ps));
}
// read all content until we reach an EI operator surrounded by whitespace.
// The following algorithm has two potential issues: what if the image stream
// contains <ws>EI<ws> ?
// Plus, there are some streams that don't have the <ws> before the EI operator
// it sounds like we would have to actually decode the content stream, which
// I'd rather avoid right now.
MemoryStream baos = new MemoryStream();
MemoryStream accumulated = new MemoryStream();
int ch;
int found = 0;
PRTokeniser tokeniser = ps.GetTokeniser();
byte[] ff = null;
while ((ch = tokeniser.Read()) != -1)
{
if (found == 0 && PRTokeniser.IsWhitespace(ch))
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 1 && ch == 'E')
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 1 && PRTokeniser.IsWhitespace(ch))
{
// this clause is needed if we have a white space character that is part of the image data
// followed by a whitespace character that precedes the EI operator. In this case, we need
// to flush the first whitespace, then treat the current whitespace as the first potential
// character for the end of stream check. Note that we don't increment 'found' here.
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
accumulated.SetLength(0);
accumulated.WriteByte((byte)ch);
}
else if (found == 2 && ch == 'I')
{
found++;
accumulated.WriteByte((byte)ch);
}
else if (found == 3 && PRTokeniser.IsWhitespace(ch))
{
byte[] tmp = baos.ToArray();
if (InlineImageStreamBytesAreComplete(tmp, imageDictionary))
{
return(tmp);
}
byte[] accumulatedArr = accumulated.ToArray();
baos.Write(accumulatedArr, 0, accumulatedArr.Length);
accumulated.SetLength(0);
baos.WriteByte((byte)ch);
found = 0;
}
else
{
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
accumulated.SetLength(0);
baos.WriteByte((byte)ch);
found = 0;
}
}
throw new InlineImageParseException("Could not find image data or EI");
}
/**
* Parses the content of a page, replacing appearances of annotations
* with Form XObjects.
* @param page a page dictionary
* @throws IOException
*/
public void Parse(PdfDictionary page, PdfIndirectReference pageref)
{
LOGGER.Info("Parsing page with reference " + pageref);
// initializing member variables
baos = new MemoryStream();
this.page = page;
this.pageref = pageref;
structParents = page.GetAsNumber(PdfName.STRUCTPARENTS);
if (structParents == null)
{
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
}
annots = page.GetAsArray(PdfName.ANNOTS);
if (annots == null)
{
annots = new PdfArray();
}
PdfDictionary resources = page.GetAsDict(PdfName.RESOURCES);
xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects == null)
{
xobjects = new PdfDictionary();
resources.Put(PdfName.XOBJECT, xobjects);
}
// parsing the content stream of the page
PRStream stream = (PRStream)page.GetAsStream(PdfName.CONTENTS);
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(RASFACTORY.CreateSource(contentBytes)));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral opr = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(opr, operands);
}
// dealing with orphans
while (items.Count > 0 && items[0].GetPageref() == pageref.Number)
{
StructureItem item = items[0];
if (item is StructureObject)
{
ConvertToXObject((StructureObject)item);
items.RemoveAt(0);
}
}
if (annots.Length == 0)
{
page.Remove(PdfName.ANNOTS);
}
else
{
PdfDictionary annot;
for (int i = 0; i < annots.Size; i++)
{
annot = annots.GetAsDict(i);
if (annot.GetAsNumber(PdfName.STRUCTPARENT) == null)
{
throw new DocumentException(MessageLocalization.GetComposedMessage("could.not.flatten.file.untagged.annotations.found"));
}
}
}
// replacing the content stream
baos.Flush();
baos.Close();
stream.SetData(baos.ToArray());
// showing how many items are left
LOGGER.Info(String.Format("There are {0} items left for processing", items.Count));
}
/**
* Parses the samples of the image from the underlying content parser, accounting for filters
* The parser must be positioned immediately after the ID operator that ends the inline image's dictionary.
* The parser will be left positioned immediately following the EI operator.
* <b>Note:</b>This implementation does not actually apply the filters at this time
* @param imageDictionary the dictionary of the inline image
* @param ps the content parser
* @return the samples of the image
* @throws IOException if anything bad happens during parsing
*/
private static byte[] ParseInlineImageSamples(PdfDictionary imageDictionary, PdfDictionary colorSpaceDic, PdfContentParser ps) {
// by the time we get to here, we have already parsed the ID operator
if (!imageDictionary.Contains(PdfName.FILTER)){
return ParseUnfilteredSamples(imageDictionary, colorSpaceDic, ps);
}
// read all content until we reach an EI operator surrounded by whitespace.
// The following algorithm has two potential issues: what if the image stream
// contains <ws>EI<ws> ?
// Plus, there are some streams that don't have the <ws> before the EI operator
// it sounds like we would have to actually decode the content stream, which
// I'd rather avoid right now.
MemoryStream baos = new MemoryStream();
MemoryStream accumulated = new MemoryStream();
int ch;
int found = 0;
PRTokeniser tokeniser = ps.GetTokeniser();
byte[] ff = null;
while ((ch = tokeniser.Read()) != -1){
if (found == 0 && PRTokeniser.IsWhitespace(ch)){
found++;
accumulated.WriteByte((byte)ch);
} else if (found == 1 && ch == 'E'){
found++;
accumulated.WriteByte((byte)ch);
} else if (found == 1 && PRTokeniser.IsWhitespace(ch)){
// this clause is needed if we have a white space character that is part of the image data
// followed by a whitespace character that precedes the EI operator. In this case, we need
// to flush the first whitespace, then treat the current whitespace as the first potential
// character for the end of stream check. Note that we don't increment 'found' here.
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
accumulated.SetLength(0);
accumulated.WriteByte((byte)ch);
} else if (found == 2 && ch == 'I'){
found++;
accumulated.WriteByte((byte)ch);
} else if (found == 3 && PRTokeniser.IsWhitespace(ch)){
try
{
byte[] tmp = baos.ToArray();
new PdfImageObject(imageDictionary, tmp, colorSpaceDic);
return tmp;
}
catch (Exception)
{
byte[] tmp = accumulated.ToArray();
baos.Write(tmp, 0, tmp.Length);
accumulated.SetLength(0);
baos.WriteByte((byte)ch);
found = 0;
}
} else {
baos.Write(ff = accumulated.ToArray(), 0, ff.Length);
accumulated.SetLength(0);
baos.WriteByte((byte)ch);
found = 0;
}
}
throw new InlineImageParseException("Could not find image data or EI");
}
