public PdfDictionary Parse(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (baseParser == null)
{
throw new ArgumentNullException(nameof(baseParser));
}
if (pool == null)
{
throw new ArgumentNullException(nameof(pool));
}
ReadHelper.ReadExpectedChar(reader, '<');
ReadHelper.ReadExpectedChar(reader, '<');
ReadHelper.SkipSpaces(reader);
var dictionary = new PdfDictionary();
var done = false;
while (!done)
{
ReadHelper.SkipSpaces(reader);
var c = (char)reader.Peek();
switch (c)
{
case '>':
done = true;
break;
case '/':
var nameValue = ParseCosDictionaryNameValuePair(reader, baseParser, pool);
if (nameValue.key != null && nameValue.value != null)
{
dictionary.Set(nameValue.key, nameValue.value);
}
break;
default:
if (ReadUntilEnd(reader))
{
return(new PdfDictionary());
}
break;
}
}
ReadHelper.ReadExpectedString(reader, ">>");
return(dictionary);
}
public CosBase Parse(IRandomAccessRead reader, long objectNumber, int objectGeneration,
CosObjectPool pool, CrossReferenceTable crossReferenceTable,
BruteForceSearcher bruteForceSearcher,
bool isLenient,
bool requireExistingObject)
{
if (pool == null)
{
throw new ArgumentNullException(nameof(pool));
}
var key = new CosObjectKey(objectNumber, objectGeneration);
var pdfObject = pool.GetOrCreateDefault(key);
if (pdfObject.GetObject() != null)
{
return(pdfObject.GetObject());
}
if (crossReferenceTable == null)
{
throw new ArgumentNullException(nameof(crossReferenceTable));
}
var offsetOrStreamNumber = TryGet(key, crossReferenceTable.ObjectOffsets);
if (requireExistingObject && (offsetOrStreamNumber == null || offsetOrStreamNumber <= 0))
{
throw new InvalidOperationException("Object must be defined and not compressed: " + key);
}
if (isLenient && offsetOrStreamNumber == null)
{
var locations = bruteForceSearcher.GetObjectLocations();
offsetOrStreamNumber = TryGet(key, locations);
if (offsetOrStreamNumber != null)
{
crossReferenceTable.UpdateOffset(key, offsetOrStreamNumber.Value);
}
}
if (offsetOrStreamNumber == null)
{
return(CosNull.Null);
}
var isCompressedStreamObject = offsetOrStreamNumber <= 0;
if (!isCompressedStreamObject)
{
return(ParseObjectFromFile(offsetOrStreamNumber.Value, reader, key, pool, isLenient));
}
return(ParseCompressedStreamObject(reader, -offsetOrStreamNumber.Value, objectNumber, pool, crossReferenceTable, bruteForceSearcher, isLenient));
}
public IReadOnlyList <CosObject> Parse(PdfRawStream stream, CosObjectPool pool)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
//need to first parse the header.
var numberOfObjects = stream.Dictionary.GetIntOrDefault(CosName.N);
var objectNumbers = new List <long>(numberOfObjects);
var streamObjects = new List <CosObject>(numberOfObjects);
var bytes = stream.Decode(filterProvider);
var reader = new RandomAccessBuffer(bytes);
for (int i = 0; i < numberOfObjects; i++)
{
long objectNumber = ObjectHelper.ReadObjectNumber(reader);
// skip offset
ReadHelper.ReadLong(reader);
objectNumbers.Add(objectNumber);
}
CosObject obj;
CosBase cosObject;
int objectCounter = 0;
while ((cosObject = baseParser.Parse(reader, pool)) != null)
{
obj = new CosObject(cosObject);
obj.SetGenerationNumber(0);
if (objectCounter >= objectNumbers.Count)
{
log.Error("/ObjStm (object stream) has more objects than /N " + numberOfObjects);
break;
}
obj.SetObjectNumber(objectNumbers[objectCounter]);
streamObjects.Add(obj);
// According to the spec objects within an object stream shall not be enclosed
// by obj/endobj tags, but there are some pdfs in the wild using those tags
// skip endobject marker if present
if (!reader.IsEof() && reader.Peek() == 'e')
{
ReadHelper.ReadLine(reader);
}
objectCounter++;
}
return(streamObjects);
}
public XrefOffsetValidator(ILog log, IRandomAccessRead source, CosDictionaryParser dictionaryParser,
CosBaseParser baseParser,
CosObjectPool pool)
{
this.log = log;
this.source = source;
this.dictionaryParser = dictionaryParser;
this.baseParser = baseParser;
this.pool = pool;
}
public CosBase Parse(IRandomAccessRead reader, CosObject obj, CosObjectPool pool,
CrossReferenceTable crossReferenceTable, BruteForceSearcher bruteForceSearcher, bool isLenient, bool requireExistingObject)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
return(Parse(reader, obj.GetObjectNumber(), obj.GetGenerationNumber(), pool,
crossReferenceTable, bruteForceSearcher, isLenient, requireExistingObject));
}
public PdfObjectParser(ILog log, CosBaseParser baseParser, CosStreamParser streamParser, CrossReferenceTable crossReferenceTable,
BruteForceSearcher bruteForceSearcher,
CosObjectPool objectPool,
ObjectStreamParser objectStreamParser)
{
this.log = log ?? new NoOpLog();
this.baseParser = baseParser ?? throw new ArgumentNullException(nameof(baseParser));
this.streamParser = streamParser ?? throw new ArgumentNullException(nameof(streamParser));
this.crossReferenceTable = crossReferenceTable ?? throw new ArgumentNullException(nameof(crossReferenceTable));
this.bruteForceSearcher = bruteForceSearcher ?? throw new ArgumentNullException(nameof(bruteForceSearcher));
this.objectPool = objectPool ?? throw new ArgumentNullException(nameof(objectPool));
this.objectStreamParser = objectStreamParser ?? throw new ArgumentNullException(nameof(objectStreamParser));
}
private CosBase ParseObjectFromFile(long offset, IRandomAccessRead reader,
CosObjectKey key,
CosObjectPool pool,
bool isLenientParsing)
{
reader.Seek(offset);
var objectNumber = ObjectHelper.ReadObjectNumber(reader);
var objectGeneration = ObjectHelper.ReadGenerationNumber(reader);
ReadHelper.ReadExpectedString(reader, "obj", true);
if (objectNumber != key.Number || objectGeneration != key.Generation)
{
throw new InvalidOperationException($"Xref for {key} points to object {objectNumber} {objectGeneration} at {offset}");
}
ReadHelper.SkipSpaces(reader);
var baseObject = baseParser.Parse(reader, pool);
var endObjectKey = ReadHelper.ReadString(reader);
var atStreamStart = string.Equals(endObjectKey, "stream");
if (atStreamStart)
{
var streamStartBytes = OtherEncodings.StringAsLatin1Bytes(endObjectKey);
reader.Rewind(streamStartBytes.Length);
baseObject = ReadNormalObjectStream(reader, baseObject, offset, isLenientParsing, out endObjectKey);
}
if (!string.Equals(endObjectKey, "endobj"))
{
var message =
$"Object ({objectNumber}:{objectGeneration}) at offset {offset} does not end with \'endobj\' but with \'{endObjectKey}\'";
if (isLenientParsing)
{
log.Warn(message);
}
else
{
throw new InvalidOperationException(message);
}
}
return(baseObject);
}
public ParsingCachingProviders(CosObjectPool objectPool, BruteForceSearcher bruteForceSearcher, IResourceStore resourceContainer)
{
ObjectPool = objectPool ?? throw new ArgumentNullException(nameof(objectPool));
BruteForceSearcher = bruteForceSearcher ?? throw new ArgumentNullException(nameof(bruteForceSearcher));
ResourceContainer = resourceContainer ?? throw new ArgumentNullException(nameof(resourceContainer));
}
private CosBase ParseCompressedStreamObject(IRandomAccessRead reader, long streamObjectNumber, long requestedNumber, CosObjectPool objectPool, CrossReferenceTable crossReferenceTable, BruteForceSearcher bruteForceSearcher, bool isLenientParsing)
{
var baseStream = Parse(reader, streamObjectNumber, 0, objectPool, crossReferenceTable, bruteForceSearcher,
isLenientParsing, true);
if (!(baseStream is PdfRawStream stream))
{
log.Warn($"Could not find a stream for the object number, defaults to returning CosNull: {streamObjectNumber}");
return(CosNull.Null);
}
var objects = objectStreamParser.Parse(stream, objectPool);
// register all objects which are referenced to be contained in object stream
foreach (var next in objects)
{
var streamKey = new CosObjectKey(next);
var offset = TryGet(streamKey, crossReferenceTable.ObjectOffsets);
if (offset != null && offset == -streamObjectNumber)
{
var streamObject = objectPool.Get(streamKey);
streamObject.SetObject(next.GetObject());
}
}
var matchingStreamObject = objects.FirstOrDefault(x => x.GetObjectNumber() == requestedNumber);
if (matchingStreamObject != null)
{
return(matchingStreamObject);
}
log.Error($"Could not find the object {requestedNumber} in the stream for object {streamObjectNumber}. Returning CosNull.");
return(CosNull.Null);
}
public CosBase Parse(IRandomAccessRead reader, CosObjectPool pool)
{
return(CosNull.Null);
}
private static CosBase ParseTrailer(IRandomAccessRead reader, CrossReferenceTable crossReferenceTable,
DynamicParser dynamicParser, BruteForceSearcher bruteForceSearcher, CosObjectPool pool, bool isLenientParsing)
{
foreach (var value in crossReferenceTable.Dictionary.Values)
{
if (value is CosObject temporaryObject)
{
// Loads these objects into the object pool for access later.
dynamicParser.Parse(reader, temporaryObject, pool, crossReferenceTable, bruteForceSearcher,
isLenientParsing, false);
}
}
CosObject root = (CosObject)crossReferenceTable.Dictionary.GetItemOrDefault(CosName.ROOT);
if (root == null)
{
throw new InvalidOperationException("Missing root object specification in trailer.");
}
var rootObject = dynamicParser.Parse(reader, root, pool, crossReferenceTable, bruteForceSearcher,
isLenientParsing, false);
return(rootObject);
}
private static CosBase ParseValue(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
var numOffset = reader.GetPosition();
var value = baseParser.Parse(reader, pool);
ReadHelper.SkipSpaces(reader);
// proceed if the given object is a number and the following is a number as well
if (!(value is ICosNumber) || !ReadHelper.IsDigit(reader))
{
return(value);
}
// read the remaining information of the object number
var genOffset = reader.GetPosition();
var generationNumber = baseParser.Parse(reader, pool);
ReadHelper.SkipSpaces(reader);
ReadHelper.ReadExpectedChar(reader, 'R');
if (!(value is CosInt))
{
throw new InvalidOperationException("expected number, actual=" + value + " at offset " + numOffset);
}
if (!(generationNumber is CosInt))
{
throw new InvalidOperationException("expected number, actual=" + value + " at offset " + genOffset);
}
var key = new CosObjectKey(((CosInt)value).AsLong(), ((CosInt)generationNumber).AsInt());
// dereference the object
return(pool.Get(key));
}
private (CosName key, CosBase value) ParseCosDictionaryNameValuePair(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
var key = nameParser.Parse(reader);
var value = ParseValue(reader, baseParser, pool);
ReadHelper.SkipSpaces(reader);
if ((char)reader.Peek() == 'd')
{
// if the next string is 'def' then we are parsing a cmap stream
// and want to ignore it, otherwise throw an exception.
var potentialDef = ReadHelper.ReadString(reader);
if (!potentialDef.Equals("def"))
{
reader.Unread(OtherEncodings.StringAsLatin1Bytes(potentialDef));
}
else
{
ReadHelper.SkipSpaces(reader);
}
}
if (value == null)
{
log?.Warn("Bad Dictionary Declaration " + ReadHelper.ReadString(reader));
return(null, null);
}
// label this item as direct, to avoid signature problems.
value.Direct = true;
return(key, value);
}
public COSArray Parse(IRandomAccessRead reader, CosBaseParser baseParser, CosObjectPool pool)
{
ReadHelper.ReadExpectedChar(reader, '[');
var po = new COSArray();
CosBase pbo;
ReadHelper.SkipSpaces(reader);
int i;
while (((i = reader.Peek()) > 0) && ((char)i != ']'))
{
pbo = baseParser.Parse(reader, pool);
if (pbo is CosObject)
{
// We have to check if the expected values are there or not PDFBOX-385
if (po.get(po.size() - 1) is CosInt)
{
var genNumber = (CosInt)po.remove(po.size() - 1);
if (po.get(po.size() - 1) is CosInt)
{
var number = (CosInt)po.remove(po.size() - 1);
CosObjectKey key = new CosObjectKey(number.AsLong(), genNumber.AsInt());
pbo = pool.Get(key);
}
else
{
// the object reference is somehow wrong
pbo = null;
}
}
else
{
pbo = null;
}
}
if (pbo != null)
{
po.add(pbo);
}
else
{
//it could be a bad object in the array which is just skipped
// LOG.warn("Corrupt object reference at offset " + seqSource.getPosition());
// This could also be an "endobj" or "endstream" which means we can assume that
// the array has ended.
string isThisTheEnd = ReadHelper.ReadString(reader);
reader.Unread(OtherEncodings.StringAsLatin1Bytes(isThisTheEnd));
if (string.Equals(isThisTheEnd, "endobj") || string.Equals(isThisTheEnd, "endstream"))
{
return(po);
}
}
ReadHelper.SkipSpaces(reader);
}
// read ']'
reader.Read();
ReadHelper.SkipSpaces(reader);
return(po);
}
public PdfDictionary Parse(IRandomAccessRead reader, IBaseParser baseParser, CosObjectPool pool)
{
return(new PdfDictionary());
}
private bool TryParseTrailer(IRandomAccessRead source, bool isLenientParsing, CosObjectPool pool, out PdfDictionary trailer)
{
trailer = null;
// parse the last trailer.
var trailerOffset = source.GetPosition();
// PDFBOX-1739 skip extra xref entries in RegisSTAR documents
if (isLenientParsing)
{
int nextCharacter = source.Peek();
while (nextCharacter != 't' && ReadHelper.IsDigit(nextCharacter))
{
if (source.GetPosition() == trailerOffset)
{
// warn only the first time
//LOG.warn("Expected trailer object at position " + trailerOffset
// + ", keep trying");
}
ReadHelper.ReadLine(source);
nextCharacter = source.Peek();
}
}
if (source.Peek() != 't')
{
return(false);
}
//read "trailer"
long currentOffset = source.GetPosition();
string nextLine = ReadHelper.ReadLine(source);
if (!nextLine.Trim().Equals("trailer"))
{
// in some cases the EOL is missing and the trailer immediately
// continues with "<<" or with a blank character
// even if this does not comply with PDF reference we want to support as many PDFs as possible
// Acrobat reader can also deal with this.
if (nextLine.StartsWith("trailer"))
{
// we can't just unread a portion of the read data as we don't know if the EOL consist of 1 or 2 bytes
int len = "trailer".Length;
// jump back right after "trailer"
source.Seek(currentOffset + len);
}
else
{
return(false);
}
}
// in some cases the EOL is missing and the trailer continues with " <<"
// even if this does not comply with PDF reference we want to support as many PDFs as possible
// Acrobat reader can also deal with this.
ReadHelper.SkipSpaces(source);
PdfDictionary parsedTrailer = dictionaryParser.Parse(source, baseParser, pool);
trailer = parsedTrailer;
ReadHelper.SkipSpaces(source);
return(true);
}
public bool TryParse(IRandomAccessRead source, long offset, bool isLenientParsing, CosObjectPool pool, out CrossReferenceTablePartBuilder builder)
{
builder = null;
var tableStartOffset = source.GetPosition();
if (source.Peek() != 'x')
{
return(false);
}
var xref = ReadHelper.ReadString(source);
if (!xref.Trim().Equals("xref"))
{
return(false);
}
// check for trailer after xref
var str = ReadHelper.ReadString(source);
byte[] b = OtherEncodings.StringAsLatin1Bytes(str);
source.Rewind(b.Length);
if (str.StartsWith("trailer"))
{
log.Warn("skipping empty xref table");
return(false);
}
builder = new CrossReferenceTablePartBuilder
{
Offset = offset,
XRefType = CrossReferenceType.Table
};
// Tables can have multiple sections. Each starts with a starting object id and a count.
while (true)
{
if (!TableSubsectionDefinition.TryRead(log, source, out var subsectionDefinition))
{
log.Warn($"Unexpected subsection definition in the cross-reference table at offset {offset}");
if (isLenientParsing)
{
break;
}
return(false);
}
var currentObjectId = subsectionDefinition.FirstNumber;
ReadHelper.SkipSpaces(source);
for (var i = 0; i < subsectionDefinition.Count; i++)
{
if (source.IsEof() || ReadHelper.IsEndOfName((char)source.Peek()))
{
break;
}
if (source.Peek() == 't')
{
break;
}
//Ignore table contents
var currentLine = ReadHelper.ReadLine(source);
var splitString = currentLine.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (splitString.Length < 3)
{
log.Warn("invalid xref line: " + currentLine);
break;
}
// This supports the corrupt table as reported in PDFBOX-474 (XXXX XXX XX n)
if (splitString[splitString.Length - 1].Equals(InUseEntry))
{
try
{
var objectOffset = long.Parse(splitString[0]);
if (objectOffset >= tableStartOffset && objectOffset <= source.GetPosition())
{
// PDFBOX-3923: offset points inside this table - that can't be good
throw new InvalidOperationException(
$"Object offset {objectOffset} is within its own cross-reference table for object {currentObjectId}");
}
var generation = int.Parse(splitString[1]);
builder.Add(currentObjectId, generation, objectOffset);
}
catch (FormatException e)
{
throw new InvalidOperationException("Bad", e);
}
}
else if (!splitString[2].Equals(FreeEntry))
{
throw new InvalidOperationException(
$"Corrupt cross-reference table entry for object {currentObjectId}. The indicator was not 'n' or 'f' but {splitString[2]}.");
}
currentObjectId++;
ReadHelper.SkipSpaces(source);
}
ReadHelper.SkipSpaces(source);
if (!ReadHelper.IsDigit(source))
{
break;
}
}
if (!TryParseTrailer(source, isLenientParsing, pool, out var trailer))
{
throw new InvalidOperationException($"Something went wrong trying to read the XREF table at {offset}.");
}
builder.Dictionary = trailer;
builder.Previous = trailer.GetLongOrDefault(CosName.PREV);
return(true);
}
private bool CheckXRefStreamOffset(IRandomAccessRead source, long startXRefOffset, bool isLenient, CosObjectPool pool)
{
// repair mode isn't available in non-lenient mode
if (!isLenient || startXRefOffset == 0)
{
return(true);
}
// seek to offset-1
source.Seek(startXRefOffset - 1);
int nextValue = source.Read();
// the first character has to be a whitespace, and then a digit
if (ReadHelper.IsWhitespace(nextValue))
{
ReadHelper.SkipSpaces(source);
if (ReadHelper.IsDigit(source))
{
try
{
// it's a XRef stream
ObjectHelper.ReadObjectNumber(source);
ObjectHelper.ReadGenerationNumber(source);
ReadHelper.ReadExpectedString(source, "obj", true);
// check the dictionary to avoid false positives
PdfDictionary dict = dictionaryParser.Parse(source, baseParser, pool);
source.Seek(startXRefOffset);
if (dict.IsType(CosName.XREF))
{
return(true);
}
}
catch (Exception ex)
{
log.Error("Couldn't read the xref stream object.", ex);
// there wasn't an object of a xref stream
source.Seek(startXRefOffset);
}
}
}
return(false);
}
private static PdfDocument OpenDocument(IRandomAccessRead reader, IInputBytes inputBytes, ISeekableTokenScanner scanner, IContainer container, bool isLenientParsing)
{
var log = container.Get <ILog>();
var version = container.Get <FileHeaderParser>().Parse(scanner, isLenientParsing);
var crossReferenceOffset = container.Get <FileTrailerParser>().GetFirstCrossReferenceOffset(inputBytes, scanner, isLenientParsing);
var pool = new CosObjectPool();
// TODO: make this use the scanner.
var validator = new CrossReferenceOffsetValidator(new XrefOffsetValidator(log, reader, container.Get <CosDictionaryParser>(),
container.Get <CosBaseParser>(), pool));
crossReferenceOffset = validator.Validate(crossReferenceOffset, isLenientParsing);
var crossReferenceTable = container.Get <CrossReferenceParser>()
.Parse(reader, isLenientParsing, crossReferenceOffset, pool);
container.Get <CrossReferenceParser>().ParseNew(crossReferenceOffset, scanner, isLenientParsing);
var filterProvider = container.Get <IFilterProvider>();
var bruteForceSearcher = new BruteForceSearcher(reader);
var pdfObjectParser = new PdfObjectParser(container.Get <ILog>(), container.Get <CosBaseParser>(),
container.Get <CosStreamParser>(), crossReferenceTable, bruteForceSearcher, pool, container.Get <ObjectStreamParser>());
var trueTypeFontParser = new TrueTypeFontParser();
var fontDescriptorFactory = new FontDescriptorFactory();
var cidFontFactory = new CidFontFactory(fontDescriptorFactory, trueTypeFontParser, pdfObjectParser, filterProvider);
var cMapCache = new CMapCache(new CMapParser());
var fontFactory = new FontFactory(log, new Type0FontHandler(cidFontFactory,
cMapCache,
filterProvider,
pdfObjectParser),
new TrueTypeFontHandler(pdfObjectParser, filterProvider, cMapCache, fontDescriptorFactory, trueTypeFontParser));
var dynamicParser = container.Get <DynamicParser>();
var resourceContainer = new ResourceContainer(pdfObjectParser, fontFactory);
var pageFactory = new PageFactory(resourceContainer, pdfObjectParser, filterProvider, new PageContentParser(new ReflectionGraphicsStateOperationFactory()));
var informationFactory = new DocumentInformationFactory();
var catalogFactory = new CatalogFactory(pdfObjectParser);
var root = ParseTrailer(reader, crossReferenceTable, dynamicParser, bruteForceSearcher, pool,
isLenientParsing);
if (!(root is PdfDictionary rootDictionary))
{
throw new InvalidOperationException("Expected root dictionary, but got this: " + root);
}
// in some pdfs the type value "Catalog" is missing in the root object
if (isLenientParsing && !rootDictionary.ContainsKey(CosName.TYPE))
{
rootDictionary.Set(CosName.TYPE, CosName.CATALOG);
}
var information = informationFactory.Create(pdfObjectParser, crossReferenceTable.Dictionary, reader, isLenientParsing);
var catalog = catalogFactory.Create(rootDictionary, reader, isLenientParsing);
var caching = new ParsingCachingProviders(pool, bruteForceSearcher, resourceContainer);
return(new PdfDocument(log, reader, version, crossReferenceTable, isLenientParsing, caching, pageFactory, pdfObjectParser, catalog, information));
}
public CosBase Parse(IRandomAccessRead reader, CosObjectPool pool)
{
CosBase retval = null;
ReadHelper.SkipSpaces(reader);
int nextByte = reader.Peek();
if (nextByte == -1)
{
return(null);
}
char c = (char)nextByte;
switch (c)
{
case '<':
{
// pull off first left bracket
int leftBracket = reader.Read();
// check for second left bracket
c = (char)reader.Peek();
reader.Unread(leftBracket);
if (c == '<')
{
retval = dictionaryParser.Parse(reader, this, pool);
ReadHelper.SkipSpaces(reader);
}
else
{
retval = stringParser.Parse(reader);
}
break;
}
case '[':
{
// array
retval = arrayParser.Parse(reader, this, pool);
break;
}
case '(':
retval = stringParser.Parse(reader);
break;
case '/':
// name
retval = nameParser.Parse(reader);
break;
case 'n':
{
// null
ReadHelper.ReadExpectedString(reader, "null");
retval = CosNull.Null;
break;
}
case 't':
{
string truestring = OtherEncodings.BytesAsLatin1String(reader.ReadFully(4));
if (truestring.Equals("true"))
{
retval = PdfBoolean.True;
}
else
{
throw new IOException("expected true actual='" + truestring + "' " + reader +
"' at offset " + reader.GetPosition());
}
break;
}
case 'f':
{
string falsestring = OtherEncodings.BytesAsLatin1String(reader.ReadFully(5));
if (falsestring.Equals("false"))
{
retval = PdfBoolean.False;
}
else
{
throw new IOException("expected false actual='" + falsestring + "' " + reader +
"' at offset " + reader.GetPosition());
}
break;
}
case 'R':
reader.Read();
retval = new CosObject(null);
break;
default:
if (char.IsDigit(c) || c == '-' || c == '+' || c == '.')
{
StringBuilder buf = new StringBuilder();
int ic = reader.Read();
c = (char)ic;
while (char.IsDigit(c) ||
c == '-' ||
c == '+' ||
c == '.' ||
c == 'E' ||
c == 'e')
{
buf.Append(c);
ic = reader.Read();
c = (char)ic;
}
if (ic != -1)
{
reader.Unread(ic);
}
retval = CosNumberFactory.get(buf.ToString()) as CosBase;
}
else
{
//This is not suppose to happen, but we will allow for it
//so we are more compatible with POS writers that don't
//follow the spec
string badstring = ReadHelper.ReadString(reader);
if (badstring == string.Empty)
{
int peek = reader.Peek();
// we can end up in an infinite loop otherwise
throw new IOException("Unknown dir object c='" + c +
"' cInt=" + (int)c + " peek='" + (char)peek
+ "' peekInt=" + peek + " at offset " + reader.GetPosition());
}
// if it's an endstream/endobj, we want to put it back so the caller will see it
if (string.Equals("endobj", badstring) || string.Equals("endstream", badstring))
{
reader.Unread(OtherEncodings.StringAsLatin1Bytes(badstring));
}
}
break;
}
return(retval);
}