mirror of
https://github.com/qpdf/qpdf.git
synced 2024-09-27 20:49:06 +00:00
5d4cad9c02
Significantly improve the code's use of off_t for file offsets, size_t for memory sizes, and integer types in cases where there has to be compatibility with external interfaces. Rework sections of the code that would have prevented qpdf from working on files larger than 2 (or maybe 4) GB in size.
789 lines
17 KiB
C++
789 lines
17 KiB
C++
#include <qpdf/QPDFObjectHandle.hh>
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#include <qpdf/QPDF.hh>
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#include <qpdf/QPDF_Bool.hh>
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#include <qpdf/QPDF_Null.hh>
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#include <qpdf/QPDF_Integer.hh>
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#include <qpdf/QPDF_Real.hh>
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#include <qpdf/QPDF_Name.hh>
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#include <qpdf/QPDF_String.hh>
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#include <qpdf/QPDF_Array.hh>
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#include <qpdf/QPDF_Dictionary.hh>
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#include <qpdf/QPDF_Stream.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/QUtil.hh>
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#include <stdexcept>
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#include <stdlib.h>
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QPDFObjectHandle::QPDFObjectHandle() :
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initialized(false),
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objid(0),
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generation(0)
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{
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}
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QPDFObjectHandle::QPDFObjectHandle(QPDF* qpdf, int objid, int generation) :
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initialized(true),
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qpdf(qpdf),
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objid(objid),
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generation(generation)
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{
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}
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QPDFObjectHandle::QPDFObjectHandle(QPDFObject* data) :
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initialized(true),
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qpdf(0),
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objid(0),
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generation(0),
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obj(data)
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{
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}
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void
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QPDFObjectHandle::releaseResolved()
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{
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// Recursively break any resolved references to indirect objects.
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// Do not cross over indirect object boundaries to avoid an
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// infinite loop. This method may only be called during final
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// destruction. See comments in QPDF::~QPDF().
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if (isIndirect())
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{
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if (this->obj.getPointer())
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{
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this->obj = 0;
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}
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}
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else
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{
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QPDFObject::ObjAccessor::releaseResolved(this->obj.getPointer());
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}
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}
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bool
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QPDFObjectHandle::isInitialized() const
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{
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return this->initialized;
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}
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template <class T>
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class QPDFObjectTypeAccessor
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{
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public:
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static bool check(QPDFObject* o)
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{
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return (o && dynamic_cast<T*>(o));
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}
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};
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bool
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QPDFObjectHandle::isBool()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Bool>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isNull()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Null>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isInteger()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Integer>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isReal()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Real>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isNumber()
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{
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return (isInteger() || isReal());
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}
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double
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QPDFObjectHandle::getNumericValue()
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{
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double result = 0.0;
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if (isInteger())
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{
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result = getIntValue();
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}
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else if (isReal())
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{
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result = atof(getRealValue().c_str());
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}
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else
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{
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throw std::logic_error("getNumericValue called for non-numeric object");
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}
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return result;
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}
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bool
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QPDFObjectHandle::isName()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Name>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isString()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_String>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isArray()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Array>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isDictionary()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Dictionary>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isStream()
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{
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dereference();
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return QPDFObjectTypeAccessor<QPDF_Stream>::check(obj.getPointer());
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}
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bool
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QPDFObjectHandle::isIndirect()
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{
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assertInitialized();
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return (this->objid != 0);
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}
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bool
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QPDFObjectHandle::isScalar()
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{
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return (! (isArray() || isDictionary() || isStream()));
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}
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// Bool accessors
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bool
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QPDFObjectHandle::getBoolValue()
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{
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assertType("Boolean", isBool());
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return dynamic_cast<QPDF_Bool*>(obj.getPointer())->getVal();
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}
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// Integer accessors
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int
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QPDFObjectHandle::getIntValue()
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{
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assertType("Integer", isInteger());
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return dynamic_cast<QPDF_Integer*>(obj.getPointer())->getVal();
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}
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// Real accessors
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std::string
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QPDFObjectHandle::getRealValue()
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{
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assertType("Real", isReal());
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return dynamic_cast<QPDF_Real*>(obj.getPointer())->getVal();
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}
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// Name accessors
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std::string
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QPDFObjectHandle::getName()
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{
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assertType("Name", isName());
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return dynamic_cast<QPDF_Name*>(obj.getPointer())->getName();
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}
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// String accessors
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std::string
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QPDFObjectHandle::getStringValue()
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{
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assertType("String", isString());
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return dynamic_cast<QPDF_String*>(obj.getPointer())->getVal();
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}
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std::string
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QPDFObjectHandle::getUTF8Value()
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{
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assertType("String", isString());
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return dynamic_cast<QPDF_String*>(obj.getPointer())->getUTF8Val();
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}
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// Array accessors
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int
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QPDFObjectHandle::getArrayNItems()
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{
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assertType("Array", isArray());
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return dynamic_cast<QPDF_Array*>(obj.getPointer())->getNItems();
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}
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QPDFObjectHandle
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QPDFObjectHandle::getArrayItem(int n)
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{
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assertType("Array", isArray());
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return dynamic_cast<QPDF_Array*>(obj.getPointer())->getItem(n);
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}
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std::vector<QPDFObjectHandle>
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QPDFObjectHandle::getArrayAsVector()
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{
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assertType("Array", isArray());
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return dynamic_cast<QPDF_Array*>(obj.getPointer())->getAsVector();
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}
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// Array mutators
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void
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QPDFObjectHandle::setArrayItem(int n, QPDFObjectHandle const& item)
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{
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assertType("Array", isArray());
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return dynamic_cast<QPDF_Array*>(obj.getPointer())->setItem(n, item);
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}
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// Dictionary accessors
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bool
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QPDFObjectHandle::hasKey(std::string const& key)
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->hasKey(key);
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}
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QPDFObjectHandle
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QPDFObjectHandle::getKey(std::string const& key)
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKey(key);
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}
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std::set<std::string>
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QPDFObjectHandle::getKeys()
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getKeys();
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}
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std::map<std::string, QPDFObjectHandle>
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QPDFObjectHandle::getDictAsMap()
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->getAsMap();
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}
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// Array and Name accessors
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bool
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QPDFObjectHandle::isOrHasName(std::string const& value)
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{
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if (isName() && (getName() == value))
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{
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return true;
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}
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else if (isArray())
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{
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int n = getArrayNItems();
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for (int i = 0; i < n; ++i)
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{
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QPDFObjectHandle item = getArrayItem(0);
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if (item.isName() && (item.getName() == value))
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{
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return true;
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}
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}
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}
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return false;
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}
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// Dictionary mutators
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void
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QPDFObjectHandle::replaceKey(std::string const& key,
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QPDFObjectHandle const& value)
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(
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obj.getPointer())->replaceKey(key, value);
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}
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void
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QPDFObjectHandle::removeKey(std::string const& key)
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(obj.getPointer())->removeKey(key);
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}
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void
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QPDFObjectHandle::replaceOrRemoveKey(std::string const& key,
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QPDFObjectHandle value)
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{
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assertType("Dictionary", isDictionary());
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return dynamic_cast<QPDF_Dictionary*>(
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obj.getPointer())->replaceOrRemoveKey(key, value);
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}
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// Stream accessors
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QPDFObjectHandle
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QPDFObjectHandle::getDict()
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{
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assertType("Stream", isStream());
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return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getDict();
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}
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PointerHolder<Buffer>
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QPDFObjectHandle::getStreamData()
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{
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assertType("Stream", isStream());
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return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getStreamData();
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}
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PointerHolder<Buffer>
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QPDFObjectHandle::getRawStreamData()
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{
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assertType("Stream", isStream());
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return dynamic_cast<QPDF_Stream*>(obj.getPointer())->getRawStreamData();
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}
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bool
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QPDFObjectHandle::pipeStreamData(Pipeline* p, bool filter,
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bool normalize, bool compress)
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{
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assertType("Stream", isStream());
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return dynamic_cast<QPDF_Stream*>(obj.getPointer())->pipeStreamData(
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p, filter, normalize, compress);
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}
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void
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QPDFObjectHandle::replaceStreamData(PointerHolder<Buffer> data,
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QPDFObjectHandle const& filter,
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QPDFObjectHandle const& decode_parms)
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{
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assertType("Stream", isStream());
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dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceStreamData(
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data, filter, decode_parms);
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}
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void
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QPDFObjectHandle::replaceStreamData(PointerHolder<StreamDataProvider> provider,
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QPDFObjectHandle const& filter,
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QPDFObjectHandle const& decode_parms,
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size_t length)
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{
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assertType("Stream", isStream());
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dynamic_cast<QPDF_Stream*>(obj.getPointer())->replaceStreamData(
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provider, filter, decode_parms, length);
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}
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int
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QPDFObjectHandle::getObjectID() const
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{
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return this->objid;
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}
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int
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QPDFObjectHandle::getGeneration() const
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{
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return this->generation;
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}
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std::map<std::string, QPDFObjectHandle>
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QPDFObjectHandle::getPageImages()
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{
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assertPageObject();
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// Note: this code doesn't handle inherited resources. If this
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// page dictionary doesn't have a /Resources key or has one whose
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// value is null or an empty dictionary, you are supposed to walk
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// up the page tree until you find a /Resources dictionary. As of
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// this writing, I don't have any test files that use inherited
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// resources, and hand-generating one won't be a good test because
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// any mistakes in my understanding would be present in both the
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// code and the test file.
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// NOTE: If support of inherited resources (see above comment) is
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// implemented, edit comment in QPDFObjectHandle.hh for this
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// function.
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std::map<std::string, QPDFObjectHandle> result;
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if (this->hasKey("/Resources"))
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{
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QPDFObjectHandle resources = this->getKey("/Resources");
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if (resources.hasKey("/XObject"))
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{
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QPDFObjectHandle xobject = resources.getKey("/XObject");
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std::set<std::string> keys = xobject.getKeys();
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for (std::set<std::string>::iterator iter = keys.begin();
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iter != keys.end(); ++iter)
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{
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std::string key = (*iter);
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QPDFObjectHandle value = xobject.getKey(key);
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if (value.isStream())
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{
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QPDFObjectHandle dict = value.getDict();
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if (dict.hasKey("/Subtype") &&
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(dict.getKey("/Subtype").getName() == "/Image") &&
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(! dict.hasKey("/ImageMask")))
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{
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result[key] = value;
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}
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}
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}
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}
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}
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return result;
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}
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std::vector<QPDFObjectHandle>
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QPDFObjectHandle::getPageContents()
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{
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assertPageObject();
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std::vector<QPDFObjectHandle> result;
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QPDFObjectHandle contents = this->getKey("/Contents");
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if (contents.isArray())
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{
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int n_items = contents.getArrayNItems();
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for (int i = 0; i < n_items; ++i)
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{
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QPDFObjectHandle item = contents.getArrayItem(i);
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if (item.isStream())
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{
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result.push_back(item);
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}
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else
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{
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throw std::runtime_error(
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"unknown item type while inspecting "
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"element of /Contents array in page "
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"dictionary");
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}
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}
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}
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else if (contents.isStream())
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{
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result.push_back(contents);
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}
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else
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{
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throw std::runtime_error("unknown object type inspecting /Contents "
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"key in page dictionary");
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}
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return result;
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}
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void
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QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
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{
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assertPageObject();
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new_contents.assertType("Stream", new_contents.isStream());
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std::vector<QPDFObjectHandle> orig_contents = getPageContents();
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std::vector<QPDFObjectHandle> content_streams;
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if (first)
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{
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QTC::TC("qpdf", "QPDFObjectHandle prepend page contents");
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content_streams.push_back(new_contents);
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}
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for (std::vector<QPDFObjectHandle>::iterator iter = orig_contents.begin();
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iter != orig_contents.end(); ++iter)
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{
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QTC::TC("qpdf", "QPDFObjectHandle append page contents");
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content_streams.push_back(*iter);
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}
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if (! first)
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{
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content_streams.push_back(new_contents);
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}
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QPDFObjectHandle contents = QPDFObjectHandle::newArray(content_streams);
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this->replaceKey("/Contents", contents);
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}
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std::string
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QPDFObjectHandle::unparse()
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{
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std::string result;
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if (this->isIndirect())
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{
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result = QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation) + " R";
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}
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else
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{
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result = unparseResolved();
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}
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return result;
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}
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std::string
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QPDFObjectHandle::unparseResolved()
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{
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dereference();
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return this->obj->unparse();
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}
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QPDFObjectHandle
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QPDFObjectHandle::newIndirect(QPDF* qpdf, int objid, int generation)
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{
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return QPDFObjectHandle(qpdf, objid, generation);
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}
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QPDFObjectHandle
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QPDFObjectHandle::newBool(bool value)
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{
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return QPDFObjectHandle(new QPDF_Bool(value));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newNull()
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{
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return QPDFObjectHandle(new QPDF_Null());
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}
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QPDFObjectHandle
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QPDFObjectHandle::newInteger(int value)
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{
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return QPDFObjectHandle(new QPDF_Integer(value));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newReal(std::string const& value)
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{
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return QPDFObjectHandle(new QPDF_Real(value));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newName(std::string const& name)
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{
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return QPDFObjectHandle(new QPDF_Name(name));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newString(std::string const& str)
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{
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return QPDFObjectHandle(new QPDF_String(str));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newArray(std::vector<QPDFObjectHandle> const& items)
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{
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return QPDFObjectHandle(new QPDF_Array(items));
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}
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QPDFObjectHandle
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QPDFObjectHandle::newDictionary(
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std::map<std::string, QPDFObjectHandle> const& items)
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{
|
|
return QPDFObjectHandle(new QPDF_Dictionary(items));
|
|
}
|
|
|
|
|
|
QPDFObjectHandle
|
|
QPDFObjectHandle::newStream(QPDF* qpdf, int objid, int generation,
|
|
QPDFObjectHandle stream_dict,
|
|
off_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");
|
|
std::map<std::string, QPDFObjectHandle> keys;
|
|
QPDFObjectHandle stream_dict = newDictionary(keys);
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
dereference();
|
|
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)
|
|
{
|
|
if (! istype)
|
|
{
|
|
throw std::logic_error(std::string("operation for ") + type_name +
|
|
" object attempted on object of wrong type");
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDFObjectHandle::assertPageObject()
|
|
{
|
|
if (! (this->isDictionary() && this->hasKey("/Type") &&
|
|
(this->getKey("/Type").getName() == "/Page")))
|
|
{
|
|
throw std::logic_error("page operation called on non-Page object");
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDFObjectHandle::dereference()
|
|
{
|
|
if (this->obj.getPointer() == 0)
|
|
{
|
|
this->obj = QPDF::Resolver::resolve(
|
|
this->qpdf, this->objid, this->generation);
|
|
if (this->obj.getPointer() == 0)
|
|
{
|
|
QTC::TC("qpdf", "QPDFObjectHandle indirect to unknown");
|
|
this->obj = new QPDF_Null();
|
|
}
|
|
}
|
|
}
|