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9744414c66
qpdf/libqpdf/QPDFObjectHandle.cc
Jay Berkenbilt 9744414c66 Enable finer grained control of stream decoding 
This commit adds several API methods that enable control over which
types of filters QPDF will attempt to decode. It also adds support for
/RunLengthDecode and /DCTDecode filters for both encoding and
decoding.
2017-08-21 17:44:22 -04:00

1723 lines
42 KiB
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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/BufferInputSource.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <stdexcept>
#include <stdlib.h>
#include <ctype.h>
class TerminateParsing
{
};
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();
}
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)
{
assertStream();
return dynamic_cast<QPDF_Stream*>(obj.getPointer())->pipeStreamData(
p, encode_flags, decode_level, suppress_warnings);
}
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::getPageContents()
{
assertPageObject();
std::vector<QPDFObjectHandle> result;
QPDFObjectHandle contents = this->getKey("/Contents");
if (contents.isArray())
{
int n_items = contents.getArrayNItems();
for (int i = 0; i < n_items; ++i)
{
QPDFObjectHandle item = contents.getArrayItem(i);
if (item.isStream())
{
result.push_back(item);
}
else
{
throw std::runtime_error(
"unknown item type while inspecting "
"element of /Contents array in page "
"dictionary");
}
}
}
else if (contents.isStream())
{
result.push_back(contents);
}
else if (! contents.isNull())
{
throw std::runtime_error("unknown object type inspecting /Contents "
"key in page dictionary");
}
return result;
}
void
QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
{
assertPageObject();
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));
}
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::parseContentStream(QPDFObjectHandle stream_or_array,
ParserCallbacks* callbacks)
{
std::vector<QPDFObjectHandle> streams;
if (stream_or_array.isArray())
{
streams = stream_or_array.getArrayAsVector();
}
else
{
streams.push_back(stream_or_array);
}
Pl_Buffer buf("concatenated stream data buffer");
std::string all_description = "content stream objects";
bool first = true;
for (std::vector<QPDFObjectHandle>::iterator iter = streams.begin();
iter != streams.end(); ++iter)
{
QPDFObjectHandle stream = *iter;
if (! stream.isStream())
{
QTC::TC("qpdf", "QPDFObjectHandle non-stream in parsecontent");
warn(stream.getOwningQPDF(),
QPDFExc(qpdf_e_damaged_pdf, "content stream",
"", 0,
"ignoring non-stream while parsing content streams"));
}
else
{
std::string og = QUtil::int_to_string(stream.getObjectID()) + " " +
QUtil::int_to_string(stream.getGeneration());
std::string description = "content stream object " + og;
if (first)
{
first = false;
}
else
{
all_description += ",";
}
all_description += " " + og;
if (! stream.pipeStreamData(&buf, 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"));
}
}
}
PointerHolder<Buffer> stream_data = buf.getBuffer();
try
{
parseContentStream_internal(stream_data, all_description, callbacks);
}
catch (TerminateParsing&)
{
return;
}
callbacks->handleEOF();
}
void
QPDFObjectHandle::parseContentStream_internal(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, false, false, 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);
char buf[4];
memset(buf, '\0', sizeof(buf));
bool done = false;
std::string inline_image;
while (! done)
{
if (input->read(&ch, 1) == 0)
{
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");
}
inline_image += ch;
memmove(buf, buf + 1, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = ch;
if (strchr(" \t\n\v\f\r", buf[0]) &&
(buf[1] == 'E') &&
(buf[2] == 'I') &&
strchr(" \t\n\v\f\r", buf[3]))
{
// We've found an EI operator.
done = true;
input->seek(-3, SEEK_CUR);
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));
}
}
}
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, false, false);
}
QPDFObjectHandle
QPDFObjectHandle::parseInternal(PointerHolder<InputSource> input,
std::string const& object_description,
QPDFTokenizer& tokenizer, bool& empty,
StringDecrypter* decrypter, QPDF* context,
bool in_array, bool in_dictionary,
bool content_stream)
{
// This method must take care not to resolve any objects. Don't
// check the tpye 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;
if (in_dictionary && in_array)
{
// Although dictionaries and arrays arbitrarily nest, these
// variables indicate what is at the top of the stack right
// now, so they can, by definition, never both be true.
throw std::logic_error(
"INTERNAL ERROR: parseInternal: in_dict && in_array");
}
QPDFObjectHandle object;
qpdf_offset_t offset = input->tell();
std::vector<QPDFObjectHandle> olist;
bool done = false;
while (! done)
{
object = QPDFObjectHandle();
QPDFTokenizer::Token token =
tokenizer.readToken(input, object_description);
switch (token.getType())
{
case QPDFTokenizer::tt_eof:
if (content_stream)
{
// Return uninitialized object to indicate EOF
return object;
}
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 (in_array)
{
done = true;
}
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 (in_dictionary)
{
done = true;
}
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:
object = parseInternal(
input, object_description, tokenizer, empty,
decrypter, context, true, false, content_stream);
break;
case QPDFTokenizer::tt_dict_open:
object = parseInternal(
input, object_description, tokenizer, empty,
decrypter, context, false, true, content_stream);
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") && (in_array || in_dictionary) &&
(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") &&
(! (in_array || in_dictionary)))
{
// 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 (in_dictionary || in_array)
{
if (! done)
{
olist.push_back(object);
}
}
else if (! object.isInitialized())
{
warn(context,
QPDFExc(qpdf_e_damaged_pdf, input->getName(),
object_description,
input->getLastOffset(),
"parse error while reading object"));
object = newNull();
}
else
{
done = true;
}
}
if (in_array)
{
object = newArray(olist);
}
else if (in_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);
}
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()
{
return (this->isDictionary() && this->hasKey("/Type") &&
(this->getKey("/Type").getName() == "/Page"));
}
bool
QPDFObjectHandle::isPagesObject()
{
return (this->isDictionary() && this->hasKey("/Type") &&
(this->getKey("/Type").getName() == "/Pages"));
}
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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