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5708b5d0aa
qpdf/libqpdf/QPDFObjectHandle.cc
Jay Berkenbilt 5708b5d0aa Add additional interface for filtering page contents
2018-02-18 21:05:47 -05:00

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#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDF_Bool.hh>
#include <qpdf/QPDF_Null.hh>
#include <qpdf/QPDF_Integer.hh>
#include <qpdf/QPDF_Real.hh>
#include <qpdf/QPDF_Name.hh>
#include <qpdf/QPDF_String.hh>
#include <qpdf/QPDF_Operator.hh>
#include <qpdf/QPDF_InlineImage.hh>
#include <qpdf/QPDF_Array.hh>
#include <qpdf/QPDF_Dictionary.hh>
#include <qpdf/QPDF_Stream.hh>
#include <qpdf/QPDF_Reserved.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/Pl_Concatenate.hh>
#include <qpdf/Pl_QPDFTokenizer.hh>
#include <qpdf/Pl_Discard.hh>
#include <qpdf/BufferInputSource.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <stdexcept>
#include <stdlib.h>
#include <ctype.h>
class TerminateParsing
{
};
class CoalesceProvider: public QPDFObjectHandle::StreamDataProvider
{
public:
CoalesceProvider(QPDFObjectHandle containing_page,
QPDFObjectHandle old_contents) :
containing_page(containing_page),
old_contents(old_contents)
{
}
virtual ~CoalesceProvider()
{
}
virtual void provideStreamData(int objid, int generation,
Pipeline* pipeline);
private:
QPDFObjectHandle containing_page;
QPDFObjectHandle old_contents;
};
void
CoalesceProvider::provideStreamData(int, int, Pipeline* p)
{
QTC::TC("qpdf", "QPDFObjectHandle coalesce provide stream data");
Pl_Concatenate concat("concatenate", p);
std::string description = "page object " +
QUtil::int_to_string(containing_page.getObjectID()) + " " +
QUtil::int_to_string(containing_page.getGeneration());
std::string all_description;
old_contents.pipeContentStreams(&concat, description, all_description);
concat.manualFinish();
}
void
QPDFObjectHandle::TokenFilter::setPipeline(Pipeline* p)
{
this->pipeline = p;
}
void
QPDFObjectHandle::TokenFilter::write(char const* data, size_t len)
{
if (! this->pipeline)
{
throw std::logic_error(
"TokenFilter::write called before setPipeline");
}
if (len)
{
this->pipeline->write(QUtil::unsigned_char_pointer(data), len);
}
}
void
QPDFObjectHandle::TokenFilter::write(std::string const& str)
{
write(str.c_str(), str.length());
}
void
QPDFObjectHandle::TokenFilter::writeToken(QPDFTokenizer::Token const& token)
{
std::string value = token.getRawValue();
write(value.c_str(), value.length());
}
void
QPDFObjectHandle::TokenFilter::finish()
{
if (! this->pipeline)
{
throw std::logic_error(
"TokenFilter::finish called before setPipeline");
}
this->pipeline->finish();
}
void
QPDFObjectHandle::ParserCallbacks::terminateParsing()
{
throw TerminateParsing();
}
QPDFObjectHandle::QPDFObjectHandle() :
initialized(false),
qpdf(0),
objid(0),
generation(0),
reserved(false)
{
}
QPDFObjectHandle::QPDFObjectHandle(QPDF* qpdf, int objid, int generation) :
initialized(true),
qpdf(qpdf),
objid(objid),
generation(generation),
reserved(false)
{
}
QPDFObjectHandle::QPDFObjectHandle(QPDFObject* data) :
initialized(true),
qpdf(0),
objid(0),
generation(0),
obj(data),
reserved(false)
{
}
void
QPDFObjectHandle::releaseResolved()
{
// Recursively break any resolved references to indirect objects.
// Do not cross over indirect object boundaries to avoid an
// infinite loop. This method may only be called during final
// destruction. See comments in QPDF::~QPDF().
if (isIndirect())
{
if (this->obj.getPointer())
{
this->obj = 0;
}
}
else
{
QPDFObject::ObjAccessor::releaseResolved(this->obj.getPointer());
}
}
bool
QPDFObjectHandle::isInitialized() const
{
return this->initialized;
}
QPDFObject::object_type_e
QPDFObjectHandle::getTypeCode()
{
if (this->initialized)
{
dereference();
return obj->getTypeCode();
}
else
{
return QPDFObject::ot_uninitialized;
}
}
char const*
QPDFObjectHandle::getTypeName()
{
if (this->initialized)
{
dereference();
return obj->getTypeName();
}
else
{
return "uninitialized";
}
}
template <class T>
class QPDFObjectTypeAccessor
{
public:
static bool check(QPDFObject* o)
{
return (o && dynamic_cast<T*>(o));
}
};
bool
QPDFObjectHandle::isBool()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Bool>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isNull()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Null>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isInteger()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Integer>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isReal()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Real>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isNumber()
{
return (isInteger() || isReal());
}
double
QPDFObjectHandle::getNumericValue()
{
double result = 0.0;
if (isInteger())
{
result = static_cast<double>(getIntValue());
}
else if (isReal())
{
result = atof(getRealValue().c_str());
}
else
{
throw std::logic_error("getNumericValue called for non-numeric object");
}
return result;
}
bool
QPDFObjectHandle::isName()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Name>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isString()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_String>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isOperator()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Operator>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isInlineImage()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_InlineImage>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isArray()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Array>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isDictionary()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Dictionary>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isStream()
{
dereference();
return QPDFObjectTypeAccessor<QPDF_Stream>::check(obj.getPointer());
}
bool
QPDFObjectHandle::isReserved()
{
// dereference will clear reserved if this has been replaced
dereference();
return this->reserved;
}
bool
QPDFObjectHandle::isIndirect()
{
assertInitialized();
return (this->objid != 0);
}
bool
QPDFObjectHandle::isScalar()
{
return (! (isArray() || isDictionary() || isStream() ||
isOperator() || isInlineImage()));
}
// Bool accessors
bool
QPDFObjectHandle::getBoolValue()
{
assertBool();
return dynamic_cast<QPDF_Bool*>(obj.getPointer())->getVal();
}
// Integer accessors
long long
QPDFObjectHandle::getIntValue()
{
assertInteger();
return dynamic_cast<QPDF_Integer*>(obj.getPointer())->getVal();
}
// Real accessors
std::string
QPDFObjectHandle::getRealValue()
{
assertReal();
return dynamic_cast<QPDF_Real*>(obj.getPointer())->getVal();
}
// Name accessors
std::string
QPDFObjectHandle::getName()
{
assertName();
return dynamic_cast<QPDF_Name*>(obj.getPointer())->getName();
}
// String accessors
std::string
QPDFObjectHandle::getStringValue()
{
assertString();
return dynamic_cast<QPDF_String*>(obj.getPointer())->getVal();
}
std::string
QPDFObjectHandle::getUTF8Value()
{
assertString();
return dynamic_cast<QPDF_String*>(obj.getPointer())->getUTF8Val();
}
// Operator and Inline Image accessors
std::string
QPDFObjectHandle::getOperatorValue()
{
assertOperator();
return dynamic_cast<QPDF_Operator*>(obj.getPointer())->getVal();
}
std::string
QPDFObjectHandle::getInlineImageValue()
{
assertInlineImage();
return dynamic_cast<QPDF_InlineImage*>(obj.getPointer())->getVal();
}
// Array accessors
int
QPDFObjectHandle::getArrayNItems()
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->getNItems();
}
QPDFObjectHandle
QPDFObjectHandle::getArrayItem(int n)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->getItem(n);
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::getArrayAsVector()
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->getAsVector();
}
// Array mutators
void
QPDFObjectHandle::setArrayItem(int n, QPDFObjectHandle const& item)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->setItem(n, item);
}
void
QPDFObjectHandle::setArrayFromVector(std::vector<QPDFObjectHandle> const& items)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->setFromVector(items);
}
void
QPDFObjectHandle::insertItem(int at, QPDFObjectHandle const& item)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->insertItem(at, item);
}
void
QPDFObjectHandle::appendItem(QPDFObjectHandle const& item)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->appendItem(item);
}
void
QPDFObjectHandle::eraseItem(int at)
{
assertArray();
return dynamic_cast<QPDF_Array*>(obj.getPointer())->eraseItem(at);
}
// Dictionary accessors
bool
QPDFObjectHandle::hasKey(std::string const& key)
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->hasKey(key);
}
QPDFObjectHandle
QPDFObjectHandle::getKey(std::string const& key)
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKey(key);
}
std::set<std::string>
QPDFObjectHandle::getKeys()
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKeys();
}
std::map<std::string, QPDFObjectHandle>
QPDFObjectHandle::getDictAsMap()
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getAsMap();
}
// Array and Name accessors
bool
QPDFObjectHandle::isOrHasName(std::string const& value)
{
if (isName() && (getName() == value))
{
return true;
}
else if (isArray())
{
int n = getArrayNItems();
for (int i = 0; i < n; ++i)
{
QPDFObjectHandle item = getArrayItem(0);
if (item.isName() && (item.getName() == value))
{
return true;
}
}
}
return false;
}
// Indirect object accessors
QPDF*
QPDFObjectHandle::getOwningQPDF()
{
// Will be null for direct objects
return this->qpdf;
}
// Dictionary mutators
void
QPDFObjectHandle::replaceKey(std::string const& key,
QPDFObjectHandle const& value)
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(
obj.getPointer())->replaceKey(key, value);
}
void
QPDFObjectHandle::removeKey(std::string const& key)
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->removeKey(key);
}
void
QPDFObjectHandle::replaceOrRemoveKey(std::string const& key,
QPDFObjectHandle value)
{
assertDictionary();
return dynamic_cast<QPDF_Dictionary*>(
obj.getPointer())->replaceOrRemoveKey(key, value);
}
// Stream accessors
QPDFObjectHandle
QPDFObjectHandle::getDict()
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getDict();
}
bool
QPDFObjectHandle::isDataModified()
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->isDataModified();
}
void
QPDFObjectHandle::replaceDict(QPDFObjectHandle new_dict)
{
assertStream();
dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceDict(new_dict);
}
PointerHolder<Buffer>
QPDFObjectHandle::getStreamData(qpdf_stream_decode_level_e level)
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getStreamData(level);
}
PointerHolder<Buffer>
QPDFObjectHandle::getRawStreamData()
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getRawStreamData();
}
bool
QPDFObjectHandle::pipeStreamData(Pipeline* p,
unsigned long encode_flags,
qpdf_stream_decode_level_e decode_level,
bool suppress_warnings, bool will_retry)
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->pipeStreamData(
p, encode_flags, decode_level, suppress_warnings, will_retry);
}
bool
QPDFObjectHandle::pipeStreamData(Pipeline* p, bool filter,
bool normalize, bool compress)
{
unsigned long encode_flags = 0;
qpdf_stream_decode_level_e decode_level = qpdf_dl_none;
if (filter)
{
decode_level = qpdf_dl_generalized;
if (normalize)
{
encode_flags |= qpdf_ef_normalize;
}
if (compress)
{
encode_flags |= qpdf_ef_compress;
}
}
return pipeStreamData(p, encode_flags, decode_level, false);
}
void
QPDFObjectHandle::replaceStreamData(PointerHolder<Buffer> data,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
assertStream();
dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceStreamData(
data, filter, decode_parms);
}
void
QPDFObjectHandle::replaceStreamData(std::string const& data,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
assertStream();
PointerHolder<Buffer> b = new Buffer(data.length());
unsigned char* bp = b->getBuffer();
memcpy(bp, data.c_str(), data.length());
dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceStreamData(
b, filter, decode_parms);
}
void
QPDFObjectHandle::replaceStreamData(PointerHolder<StreamDataProvider> provider,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
assertStream();
dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceStreamData(
provider, filter, decode_parms);
}
QPDFObjGen
QPDFObjectHandle::getObjGen() const
{
return QPDFObjGen(this->objid, this->generation);
}
int
QPDFObjectHandle::getObjectID() const
{
return this->objid;
}
int
QPDFObjectHandle::getGeneration() const
{
return this->generation;
}
std::map<std::string, QPDFObjectHandle>
QPDFObjectHandle::getPageImages()
{
assertPageObject();
// Note: this code doesn't handle inherited resources. If this
// page dictionary doesn't have a /Resources key or has one whose
// value is null or an empty dictionary, you are supposed to walk
// up the page tree until you find a /Resources dictionary. As of
// this writing, I don't have any test files that use inherited
// resources, and hand-generating one won't be a good test because
// any mistakes in my understanding would be present in both the
// code and the test file.
// NOTE: If support of inherited resources (see above comment) is
// implemented, edit comment in QPDFObjectHandle.hh for this
// function. Also remove call to pushInheritedAttributesToPage
// from qpdf.cc when show_page_images is true.
std::map<std::string, QPDFObjectHandle> result;
if (this->hasKey("/Resources"))
{
QPDFObjectHandle resources = this->getKey("/Resources");
if (resources.hasKey("/XObject"))
{
QPDFObjectHandle xobject = resources.getKey("/XObject");
std::set<std::string> keys = xobject.getKeys();
for (std::set<std::string>::iterator iter = keys.begin();
iter != keys.end(); ++iter)
{
std::string key = (*iter);
QPDFObjectHandle value = xobject.getKey(key);
if (value.isStream())
{
QPDFObjectHandle dict = value.getDict();
if (dict.hasKey("/Subtype") &&
(dict.getKey("/Subtype").getName() == "/Image") &&
(! dict.hasKey("/ImageMask")))
{
result[key] = value;
}
}
}
}
}
return result;
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::arrayOrStreamToStreamArray(
std::string const& description, std::string& all_description)
{
all_description = description;
std::vector<QPDFObjectHandle> result;
if (isArray())
{
int n_items = getArrayNItems();
for (int i = 0; i < n_items; ++i)
{
QPDFObjectHandle item = getArrayItem(i);
if (item.isStream())
{
result.push_back(item);
}
else
{
QTC::TC("qpdf", "QPDFObjectHandle non-stream in stream array");
warn(item.getOwningQPDF(),
QPDFExc(qpdf_e_damaged_pdf, description,
"item index " + QUtil::int_to_string(i) +
" (from 0)", 0,
"ignoring non-stream in an array of streams"));
}
}
}
else if (isStream())
{
result.push_back(*this);
}
else if (! isNull())
{
warn(getOwningQPDF(),
QPDFExc(qpdf_e_damaged_pdf, "", description, 0,
" object is supposed to be a stream or an"
" array of streams but is neither"));
}
bool first = true;
for (std::vector<QPDFObjectHandle>::iterator iter = result.begin();
iter != result.end(); ++iter)
{
QPDFObjectHandle item = *iter;
std::string og =
QUtil::int_to_string(item.getObjectID()) + " " +
QUtil::int_to_string(item.getGeneration());
if (first)
{
first = false;
}
else
{
all_description += ",";
}
all_description += " stream " + og;
}
return result;
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::getPageContents()
{
std::string description = "page object " +
QUtil::int_to_string(this->objid) + " " +
QUtil::int_to_string(this->generation);
std::string all_description;
return this->getKey("/Contents").arrayOrStreamToStreamArray(
description, all_description);
}
void
QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
{
new_contents.assertStream();
std::vector<QPDFObjectHandle> orig_contents = getPageContents();
std::vector<QPDFObjectHandle> content_streams;
if (first)
{
QTC::TC("qpdf", "QPDFObjectHandle prepend page contents");
content_streams.push_back(new_contents);
}
for (std::vector<QPDFObjectHandle>::iterator iter = orig_contents.begin();
iter != orig_contents.end(); ++iter)
{
QTC::TC("qpdf", "QPDFObjectHandle append page contents");
content_streams.push_back(*iter);
}
if (! first)
{
content_streams.push_back(new_contents);
}
QPDFObjectHandle contents = QPDFObjectHandle::newArray(content_streams);
this->replaceKey("/Contents", contents);
}
void
QPDFObjectHandle::rotatePage(int angle, bool relative)
{
assertPageObject();
if ((angle % 90) != 0)
{
throw std::runtime_error(
"QPDF::rotatePage called with an"
" angle that is not a multiple of 90");
}
int new_angle = angle;
if (relative)
{
int old_angle = 0;
bool found_rotate = false;
QPDFObjectHandle cur_obj = *this;
bool searched_parent = false;
std::set<QPDFObjGen> visited;
while (! found_rotate)
{
if (visited.count(cur_obj.getObjGen()))
{
// Don't get stuck in an infinite loop
break;
}
if (! visited.empty())
{
searched_parent = true;
}
visited.insert(cur_obj.getObjGen());
if (cur_obj.getKey("/Rotate").isInteger())
{
found_rotate = true;
old_angle = cur_obj.getKey("/Rotate").getIntValue();
}
else if (cur_obj.getKey("/Parent").isDictionary())
{
cur_obj = cur_obj.getKey("/Parent");
}
else
{
break;
}
}
QTC::TC("qpdf", "QPDFObjectHandle found old angle",
searched_parent ? 0 : 1);
if ((old_angle % 90) != 0)
{
old_angle = 0;
}
new_angle += old_angle;
}
new_angle = (new_angle + 360) % 360;
replaceKey("/Rotate", QPDFObjectHandle::newInteger(new_angle));
}
void
QPDFObjectHandle::coalesceContentStreams()
{
assertPageObject();
QPDFObjectHandle contents = this->getKey("/Contents");
if (contents.isStream())
{
QTC::TC("qpdf", "QPDFObjectHandle coalesce called on stream");
return;
}
QPDF* qpdf = getOwningQPDF();
if (qpdf == 0)
{
// Should not be possible for a page object to not have an
// owning PDF unless it was manually constructed in some
// incorrect way.
throw std::logic_error("coalesceContentStreams called on object"
" with no associated PDF file");
}
QPDFObjectHandle new_contents = newStream(qpdf);
this->replaceKey("/Contents", new_contents);
PointerHolder<StreamDataProvider> provider =
new CoalesceProvider(*this, contents);
new_contents.replaceStreamData(provider, newNull(), newNull());
}
std::string
QPDFObjectHandle::unparse()
{
std::string result;
if (this->isIndirect())
{
result = QUtil::int_to_string(this->objid) + " " +
QUtil::int_to_string(this->generation) + " R";
}
else
{
result = unparseResolved();
}
return result;
}
std::string
QPDFObjectHandle::unparseResolved()
{
if (this->reserved)
{
throw std::logic_error(
"QPDFObjectHandle: attempting to unparse a reserved object");
}
dereference();
return this->obj->unparse();
}
QPDFObjectHandle
QPDFObjectHandle::parse(std::string const& object_str,
std::string const& object_description)
{
PointerHolder<InputSource> input =
new BufferInputSource("parsed object", object_str);
QPDFTokenizer tokenizer;
bool empty = false;
QPDFObjectHandle result =
parse(input, object_description, tokenizer, empty, 0, 0);
size_t offset = input->tell();
while (offset < object_str.length())
{
if (! isspace(object_str.at(offset)))
{
QTC::TC("qpdf", "QPDFObjectHandle trailing data in parse");
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"trailing data found parsing object from string");
}
++offset;
}
return result;
}
void
QPDFObjectHandle::pipePageContents(Pipeline* p)
{
assertPageObject();
std::string description = "page object " +
QUtil::int_to_string(this->objid) + " " +
QUtil::int_to_string(this->generation);
std::string all_description;
this->getKey("/Contents").pipeContentStreams(
p, description, all_description);
}
void
QPDFObjectHandle::pipeContentStreams(
Pipeline* p, std::string const& description, std::string& all_description)
{
std::vector<QPDFObjectHandle> streams =
arrayOrStreamToStreamArray(
description, all_description);
for (std::vector<QPDFObjectHandle>::iterator iter = streams.begin();
iter != streams.end(); ++iter)
{
QPDFObjectHandle stream = *iter;
std::string og =
QUtil::int_to_string(stream.getObjectID()) + " " +
QUtil::int_to_string(stream.getGeneration());
std::string description = "content stream object " + og;
if (! stream.pipeStreamData(p, 0, qpdf_dl_specialized))
{
QTC::TC("qpdf", "QPDFObjectHandle errors in parsecontent");
warn(stream.getOwningQPDF(),
QPDFExc(qpdf_e_damaged_pdf, "content stream",
description, 0,
"errors while decoding content stream"));
}
}
}
void
QPDFObjectHandle::parsePageContents(ParserCallbacks* callbacks)
{
assertPageObject();
std::string description = "page object " +
QUtil::int_to_string(this->objid) + " " +
QUtil::int_to_string(this->generation);
this->getKey("/Contents").parseContentStream_internal(
description, callbacks);
}
void
QPDFObjectHandle::filterPageContents(TokenFilter* filter, Pipeline* next)
{
assertPageObject();
std::string description = "token filter for page object " +
QUtil::int_to_string(this->objid) + " " +
QUtil::int_to_string(this->generation);
Pl_QPDFTokenizer token_pipeline(description.c_str(), filter);
PointerHolder<Pipeline> next_p;
if (next == 0)
{
next_p = new Pl_Discard();
next = next_p.getPointer();
}
filter->setPipeline(next);
this->pipePageContents(&token_pipeline);
}
void
QPDFObjectHandle::parseContentStream(QPDFObjectHandle stream_or_array,
ParserCallbacks* callbacks)
{
stream_or_array.parseContentStream_internal(
"content stream objects", callbacks);
}
void
QPDFObjectHandle::parseContentStream_internal(
std::string const& description,
ParserCallbacks* callbacks)
{
Pl_Buffer buf("concatenated stream data buffer");
std::string all_description;
pipeContentStreams(&buf, description, all_description);
PointerHolder<Buffer> stream_data = buf.getBuffer();
try
{
parseContentStream_data(stream_data, all_description, callbacks);
}
catch (TerminateParsing&)
{
return;
}
callbacks->handleEOF();
}
void
QPDFObjectHandle::parseContentStream_data(
PointerHolder<Buffer> stream_data,
std::string const& description,
ParserCallbacks* callbacks)
{
size_t length = stream_data->getSize();
PointerHolder<InputSource> input =
new BufferInputSource(description, stream_data.getPointer());
QPDFTokenizer tokenizer;
tokenizer.allowEOF();
bool empty = false;
while (static_cast<size_t>(input->tell()) < length)
{
QPDFObjectHandle obj =
parseInternal(input, "content", tokenizer, empty, 0, 0, true);
if (! obj.isInitialized())
{
// EOF
break;
}
callbacks->handleObject(obj);
if (obj.isOperator() && (obj.getOperatorValue() == "ID"))
{
// Discard next character; it is the space after ID that
// terminated the token. Read until end of inline image.
char ch;
input->read(&ch, 1);
tokenizer.expectInlineImage();
QPDFTokenizer::Token t = tokenizer.readToken(input, description, true);
if (t.getType() == QPDFTokenizer::tt_bad)
{
QTC::TC("qpdf", "QPDFObjectHandle EOF in inline image");
throw QPDFExc(qpdf_e_damaged_pdf, input->getName(),
"stream data", input->tell(),
"EOF found while reading inline image");
}
else
{
// Skip back over EI
input->seek(-3, SEEK_CUR);
std::string inline_image = t.getRawValue();
for (int i = 0; i < 4; ++i)
{
if (inline_image.length() > 0)
{
inline_image.erase(inline_image.length() - 1);
}
}
QTC::TC("qpdf", "QPDFObjectHandle inline image token");
callbacks->handleObject(
QPDFObjectHandle::newInlineImage(inline_image));
}
}
}
}
void
QPDFObjectHandle::addContentTokenFilter(PointerHolder<TokenFilter> filter)
{
coalesceContentStreams();
this->getKey("/Contents").addTokenFilter(filter);
}
void
QPDFObjectHandle::addTokenFilter(PointerHolder<TokenFilter> filter)
{
assertStream();
return dynamic_cast<QPDF_Stream*>(
obj.getPointer())->addTokenFilter(filter);
}
QPDFObjectHandle
QPDFObjectHandle::parse(PointerHolder<InputSource> input,
std::string const& object_description,
QPDFTokenizer& tokenizer, bool& empty,
StringDecrypter* decrypter, QPDF* context)
{
return parseInternal(input, object_description, tokenizer, empty,
decrypter, context, false);
}
QPDFObjectHandle
QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
std::string const& object_description,
QPDFTokenizer& tokenizer, bool& empty,
StringDecrypter* decrypter, QPDF* context,
bool content_stream)
{
// This method must take care not to resolve any objects. Don't
// check the type of any object without first ensuring that it is
// a direct object. Otherwise, doing so may have the side effect
// of reading the object and changing the file pointer.
empty = false;
QPDFObjectHandle object;
std::vector<std::vector<QPDFObjectHandle> > olist_stack;
olist_stack.push_back(std::vector<QPDFObjectHandle>());
std::vector<parser_state_e> state_stack;
state_stack.push_back(st_top);
std::vector<qpdf_offset_t> offset_stack;
offset_stack.push_back(input->tell());
bool done = false;
while (! done)
{
std::vector<QPDFObjectHandle>& olist = olist_stack.back();
parser_state_e state = state_stack.back();
qpdf_offset_t offset = offset_stack.back();
object = QPDFObjectHandle();
QPDFTokenizer::Token token =
tokenizer.readToken(input, object_description);
switch (token.getType())
{
case QPDFTokenizer::tt_eof:
if (content_stream)
{
state = st_eof;
}
else
{
// When not in content stream mode, EOF is tt_bad and
// throws an exception before we get here.
throw std::logic_error(
"EOF received while not in content stream mode");
}
break;
case QPDFTokenizer::tt_brace_open:
case QPDFTokenizer::tt_brace_close:
QTC::TC("qpdf", "QPDFObjectHandle bad brace");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unexpected brace token as null"));
object = newNull();
break;
case QPDFTokenizer::tt_array_close:
if (state == st_array)
{
state = st_stop;
}
else
{
QTC::TC("qpdf", "QPDFObjectHandle bad array close");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unexpected array close token as null"));
object = newNull();
}
break;
case QPDFTokenizer::tt_dict_close:
if (state == st_dictionary)
{
state = st_stop;
}
else
{
QTC::TC("qpdf", "QPDFObjectHandle bad dictionary close");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unexpected dictionary close token"));
object = newNull();
}
break;
case QPDFTokenizer::tt_array_open:
case QPDFTokenizer::tt_dict_open:
olist_stack.push_back(std::vector<QPDFObjectHandle>());
state = st_start;
offset_stack.push_back(input->tell());
state_stack.push_back(
(token.getType() == QPDFTokenizer::tt_array_open) ?
st_array : st_dictionary);
break;
case QPDFTokenizer::tt_bool:
object = newBool((token.getValue() == "true"));
break;
case QPDFTokenizer::tt_null:
object = newNull();
break;
case QPDFTokenizer::tt_integer:
object = newInteger(QUtil::string_to_ll(token.getValue().c_str()));
break;
case QPDFTokenizer::tt_real:
object = newReal(token.getValue());
break;
case QPDFTokenizer::tt_name:
object = newName(token.getValue());
break;
case QPDFTokenizer::tt_word:
{
std::string const& value = token.getValue();
if (content_stream)
{
object = QPDFObjectHandle::newOperator(value);
}
else if ((value == "R") && (state != st_top) &&
(olist.size() >= 2) &&
(! olist.at(olist.size() - 1).isIndirect()) &&
(olist.at(olist.size() - 1).isInteger()) &&
(! olist.at(olist.size() - 2).isIndirect()) &&
(olist.at(olist.size() - 2).isInteger()))
{
if (context == 0)
{
QTC::TC("qpdf", "QPDFObjectHandle indirect without context");
throw std::logic_error(
"QPDFObjectHandle::parse called without context"
" on an object with indirect references");
}
// Try to resolve indirect objects
object = newIndirect(
context,
olist.at(olist.size() - 2).getIntValue(),
olist.at(olist.size() - 1).getIntValue());
olist.pop_back();
olist.pop_back();
}
else if ((value == "endobj") && (state == st_top))
{
// We just saw endobj without having read
// anything. Treat this as a null and do not move
// the input source's offset.
object = newNull();
input->seek(input->getLastOffset(), SEEK_SET);
empty = true;
}
else
{
QTC::TC("qpdf", "QPDFObjectHandle treat word as string");
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"unknown token while reading object;"
" treating as string"));
object = newString(value);
}
}
break;
case QPDFTokenizer::tt_string:
{
std::string val = token.getValue();
if (decrypter)
{
decrypter->decryptString(val);
}
object = QPDFObjectHandle::newString(val);
}
break;
default:
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"treating unknown token type as null while "
"reading object"));
object = newNull();
break;
}
if ((! object.isInitialized()) &&
(! ((state == st_start) ||
(state == st_stop) ||
(state == st_eof))))
{
throw std::logic_error(
"QPDFObjectHandle::parseInternal: "
"unexpected uninitialized object");
object = newNull();
}
switch (state)
{
case st_eof:
if (state_stack.size() > 1)
{
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"parse error while reading object"));
}
done = true;
// Leave object uninitialized to indicate EOF
break;
case st_dictionary:
case st_array:
olist.push_back(object);
break;
case st_top:
done = true;
break;
case st_start:
break;
case st_stop:
if ((state_stack.size() < 2) || (olist_stack.size() < 2))
{
throw std::logic_error(
"QPDFObjectHandle::parseInternal: st_stop encountered"
" with insufficient elements in stack");
}
parser_state_e old_state = state_stack.back();
state_stack.pop_back();
if (old_state == st_array)
{
object = newArray(olist);
}
else if (old_state == st_dictionary)
{
// Convert list to map. Alternating elements are keys.
// Attempt to recover more or less gracefully from
// invalid dictionaries.
std::set<std::string> names;
for (std::vector<QPDFObjectHandle>::iterator iter =
olist.begin();
iter != olist.end(); ++iter)
{
if ((! (*iter).isIndirect()) && (*iter).isName())
{
names.insert((*iter).getName());
}
}
std::map<std::string, QPDFObjectHandle> dict;
int next_fake_key = 1;
for (unsigned int i = 0; i < olist.size(); ++i)
{
QPDFObjectHandle key_obj = olist.at(i);
QPDFObjectHandle val;
if (key_obj.isIndirect() || (! key_obj.isName()))
{
bool found_fake = false;
std::string candidate;
while (! found_fake)
{
candidate =
"/QPDFFake" +
QUtil::int_to_string(next_fake_key++);
found_fake = (names.count(candidate) == 0);
QTC::TC("qpdf", "QPDFObjectHandle found fake",
(found_fake ? 0 : 1));
}
warn(context,
QPDFExc(
qpdf_e_damaged_pdf,
input->getName(), object_description, offset,
"expected dictionary key but found"
" non-name object; inserting key " +
candidate));
val = key_obj;
key_obj = newName(candidate);
}
else if (i + 1 >= olist.size())
{
QTC::TC("qpdf", "QPDFObjectHandle no val for last key");
warn(context,
QPDFExc(
qpdf_e_damaged_pdf,
input->getName(), object_description, offset,
"dictionary ended prematurely; "
"using null as value for last key"));
val = newNull();
}
else
{
val = olist.at(++i);
}
dict[key_obj.getName()] = val;
}
object = newDictionary(dict);
}
olist_stack.pop_back();
offset_stack.pop_back();
if (state_stack.back() == st_top)
{
done = true;
}
else
{
olist_stack.back().push_back(object);
}
}
}
return object;
}
QPDFObjectHandle
QPDFObjectHandle::newIndirect(QPDF* qpdf, int objid, int generation)
{
if (objid == 0)
{
// Special case: QPDF uses objid 0 as a sentinel for direct
// objects, and the PDF specification doesn't allow for object
// 0. Treat indirect references to object 0 as null so that we
// never create an indirect object with objid 0.
QTC::TC("qpdf", "QPDFObjectHandle indirect with 0 objid");
return newNull();
}
return QPDFObjectHandle(qpdf, objid, generation);
}
QPDFObjectHandle
QPDFObjectHandle::newBool(bool value)
{
return QPDFObjectHandle(new QPDF_Bool(value));
}
QPDFObjectHandle
QPDFObjectHandle::newNull()
{
return QPDFObjectHandle(new QPDF_Null());
}
QPDFObjectHandle
QPDFObjectHandle::newInteger(long long value)
{
return QPDFObjectHandle(new QPDF_Integer(value));
}
QPDFObjectHandle
QPDFObjectHandle::newReal(std::string const& value)
{
return QPDFObjectHandle(new QPDF_Real(value));
}
QPDFObjectHandle
QPDFObjectHandle::newReal(double value, int decimal_places)
{
return QPDFObjectHandle(new QPDF_Real(value, decimal_places));
}
QPDFObjectHandle
QPDFObjectHandle::newName(std::string const& name)
{
return QPDFObjectHandle(new QPDF_Name(name));
}
QPDFObjectHandle
QPDFObjectHandle::newString(std::string const& str)
{
return QPDFObjectHandle(new QPDF_String(str));
}
QPDFObjectHandle
QPDFObjectHandle::newOperator(std::string const& value)
{
return QPDFObjectHandle(new QPDF_Operator(value));
}
QPDFObjectHandle
QPDFObjectHandle::newInlineImage(std::string const& value)
{
return QPDFObjectHandle(new QPDF_InlineImage(value));
}
QPDFObjectHandle
QPDFObjectHandle::newArray()
{
return newArray(std::vector<QPDFObjectHandle>());
}
QPDFObjectHandle
QPDFObjectHandle::newArray(std::vector<QPDFObjectHandle> const& items)
{
return QPDFObjectHandle(new QPDF_Array(items));
}
QPDFObjectHandle
QPDFObjectHandle::newDictionary()
{
return newDictionary(std::map<std::string, QPDFObjectHandle>());
}
QPDFObjectHandle
QPDFObjectHandle::newDictionary(
std::map<std::string, QPDFObjectHandle> const& items)
{
return QPDFObjectHandle(new QPDF_Dictionary(items));
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf, int objid, int generation,
QPDFObjectHandle stream_dict,
qpdf_offset_t offset, size_t length)
{
return QPDFObjectHandle(new QPDF_Stream(
qpdf, objid, generation,
stream_dict, offset, length));
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf)
{
QTC::TC("qpdf", "QPDFObjectHandle newStream");
QPDFObjectHandle stream_dict = newDictionary();
QPDFObjectHandle result = qpdf->makeIndirectObject(
QPDFObjectHandle(
new QPDF_Stream(qpdf, 0, 0, stream_dict, 0, 0)));
result.dereference();
QPDF_Stream* stream = dynamic_cast<QPDF_Stream*>(result.obj.getPointer());
stream->setObjGen(result.getObjectID(), result.getGeneration());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf, PointerHolder<Buffer> data)
{
QTC::TC("qpdf", "QPDFObjectHandle newStream with data");
QPDFObjectHandle result = newStream(qpdf);
result.replaceStreamData(data, newNull(), newNull());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf, std::string const& data)
{
QTC::TC("qpdf", "QPDFObjectHandle newStream with string");
QPDFObjectHandle result = newStream(qpdf);
result.replaceStreamData(data, newNull(), newNull());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newReserved(QPDF* qpdf)
{
// Reserve a spot for this object by assigning it an object
// number, but then return an unresolved handle to the object.
QPDFObjectHandle reserved = qpdf->makeIndirectObject(
QPDFObjectHandle(new QPDF_Reserved()));
QPDFObjectHandle result =
newIndirect(qpdf, reserved.objid, reserved.generation);
result.reserved = true;
return result;
}
QPDFObjectHandle
QPDFObjectHandle::shallowCopy()
{
assertInitialized();
if (isStream())
{
QTC::TC("qpdf", "QPDFObjectHandle ERR shallow copy stream");
throw std::runtime_error(
"attempt to make a shallow copy of a stream");
}
QPDFObjectHandle new_obj;
if (isArray())
{
QTC::TC("qpdf", "QPDFObjectHandle shallow copy array");
new_obj = newArray(getArrayAsVector());
}
else if (isDictionary())
{
QTC::TC("qpdf", "QPDFObjectHandle shallow copy dictionary");
new_obj = newDictionary(getDictAsMap());
}
else
{
QTC::TC("qpdf", "QPDFObjectHandle shallow copy scalar");
new_obj = *this;
}
return new_obj;
}
void
QPDFObjectHandle::makeDirectInternal(std::set<int>& visited)
{
assertInitialized();
if (isStream())
{
QTC::TC("qpdf", "QPDFObjectHandle ERR clone stream");
throw std::runtime_error(
"attempt to make a stream into a direct object");
}
int cur_objid = this->objid;
if (cur_objid != 0)
{
if (visited.count(cur_objid))
{
QTC::TC("qpdf", "QPDFObjectHandle makeDirect loop");
throw std::runtime_error(
"loop detected while converting object from "
"indirect to direct");
}
visited.insert(cur_objid);
}
if (isReserved())
{
throw std::logic_error(
"QPDFObjectHandle: attempting to make a"
" reserved object handle direct");
}
dereference();
this->qpdf = 0;
this->objid = 0;
this->generation = 0;
PointerHolder<QPDFObject> new_obj;
if (isBool())
{
QTC::TC("qpdf", "QPDFObjectHandle clone bool");
new_obj = new QPDF_Bool(getBoolValue());
}
else if (isNull())
{
QTC::TC("qpdf", "QPDFObjectHandle clone null");
new_obj = new QPDF_Null();
}
else if (isInteger())
{
QTC::TC("qpdf", "QPDFObjectHandle clone integer");
new_obj = new QPDF_Integer(getIntValue());
}
else if (isReal())
{
QTC::TC("qpdf", "QPDFObjectHandle clone real");
new_obj = new QPDF_Real(getRealValue());
}
else if (isName())
{
QTC::TC("qpdf", "QPDFObjectHandle clone name");
new_obj = new QPDF_Name(getName());
}
else if (isString())
{
QTC::TC("qpdf", "QPDFObjectHandle clone string");
new_obj = new QPDF_String(getStringValue());
}
else if (isArray())
{
QTC::TC("qpdf", "QPDFObjectHandle clone array");
std::vector<QPDFObjectHandle> items;
int n = getArrayNItems();
for (int i = 0; i < n; ++i)
{
items.push_back(getArrayItem(i));
items.back().makeDirectInternal(visited);
}
new_obj = new QPDF_Array(items);
}
else if (isDictionary())
{
QTC::TC("qpdf", "QPDFObjectHandle clone dictionary");
std::set<std::string> keys = getKeys();
std::map<std::string, QPDFObjectHandle> items;
for (std::set<std::string>::iterator iter = keys.begin();
iter != keys.end(); ++iter)
{
items[*iter] = getKey(*iter);
items[*iter].makeDirectInternal(visited);
}
new_obj = new QPDF_Dictionary(items);
}
else
{
throw std::logic_error("QPDFObjectHandle::makeDirectInternal: "
"unknown object type");
}
this->obj = new_obj;
if (cur_objid)
{
visited.erase(cur_objid);
}
}
void
QPDFObjectHandle::makeDirect()
{
std::set<int> visited;
makeDirectInternal(visited);
}
void
QPDFObjectHandle::assertInitialized() const
{
if (! this->initialized)
{
throw std::logic_error("operation attempted on uninitialized "
"QPDFObjectHandle");
}
}
void
QPDFObjectHandle::assertType(char const* type_name, bool istype) const
{
if (! istype)
{
throw std::logic_error(std::string("operation for ") + type_name +
" object attempted on object of wrong type");
}
}
void
QPDFObjectHandle::assertNull()
{
assertType("Null", isNull());
}
void
QPDFObjectHandle::assertBool()
{
assertType("Boolean", isBool());
}
void
QPDFObjectHandle::assertInteger()
{
assertType("Integer", isInteger());
}
void
QPDFObjectHandle::assertReal()
{
assertType("Real", isReal());
}
void
QPDFObjectHandle::assertName()
{
assertType("Name", isName());
}
void
QPDFObjectHandle::assertString()
{
assertType("String", isString());
}
void
QPDFObjectHandle::assertOperator()
{
assertType("Operator", isOperator());
}
void
QPDFObjectHandle::assertInlineImage()
{
assertType("InlineImage", isInlineImage());
}
void
QPDFObjectHandle::assertArray()
{
assertType("Array", isArray());
}
void
QPDFObjectHandle::assertDictionary()
{
assertType("Dictionary", isDictionary());
}
void
QPDFObjectHandle::assertStream()
{
assertType("Stream", isStream());
}
void
QPDFObjectHandle::assertReserved()
{
assertType("Reserved", isReserved());
}
void
QPDFObjectHandle::assertIndirect()
{
if (! isIndirect())
{
throw std::logic_error(
"operation for indirect object attempted on direct object");
}
}
void
QPDFObjectHandle::assertScalar()
{
assertType("Scalar", isScalar());
}
void
QPDFObjectHandle::assertNumber()
{
assertType("Number", isNumber());
}
bool
QPDFObjectHandle::isPageObject()
{
// Some PDF files have /Type broken on pages.
return (this->isDictionary() && this->hasKey("/Contents"));
}
bool
QPDFObjectHandle::isPagesObject()
{
// Some PDF files have /Type broken on pages.
return (this->isDictionary() && this->hasKey("/Kids"));
}
void
QPDFObjectHandle::assertPageObject()
{
if (! isPageObject())
{
throw std::logic_error("page operation called on non-Page object");
}
}
void
QPDFObjectHandle::dereference()
{
if (this->obj.getPointer() == 0)
{
PointerHolder<QPDFObject> obj = QPDF::Resolver::resolve(
this->qpdf, this->objid, this->generation);
if (obj.getPointer() == 0)
{
QTC::TC("qpdf", "QPDFObjectHandle indirect to unknown");
this->obj = new QPDF_Null();
}
else if (dynamic_cast<QPDF_Reserved*>(obj.getPointer()))
{
// Do not resolve
}
else
{
this->reserved = false;
this->obj = obj;
}
}
}
void
QPDFObjectHandle::warn(QPDF* qpdf, QPDFExc const& e)
{
// If parsing on behalf of a QPDF object and want to give a
// warning, we can warn through the object. If parsing for some
// other reason, such as an explicit creation of an object from a
// string, then just throw the exception.
if (qpdf)
{
QPDF::Warner::warn(qpdf, e);
}
else
{
throw e;
}
}
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