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/**
* HiddenPointer.h
*
* Helper class that we use to hide a pointer in a string. We do this
* by creating a string buffer that is a littlebit bigger, and put
* the hidden pointer in front of the name
*
* @author Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
* @copyright 2013 Copernica BV
*/
/**
* Set up namespace
*/
namespace Php {
/**
* Class definition
*/
template <typename Type>
class HiddenPointer
{
public:
/**
* Constructor to hide the pointer in a buffer
* @param pointer The pointer to hide
* @param text The visible text
* @param size Optional text size
*/
HiddenPointer(Type *pointer, const char *text, int size=-1)
{
// calculate size of the text
if (size < 0) size = ::strlen(text);
// allocate data + trailing null + size of pointer
char *buffer = new char[size + 1 + sizeof(Type *)];
// copy pointer into the buffer
memcpy(buffer, &pointer, sizeof(Type *));
// copy the name into the buffer, making it lower case at the same time
// (php function names are case insensitive, and must even be lowercase
// because all the lookups are done in lowercase)
for (int i = 0; i < size + 1; i++)
{
// convert char the lower case
buffer[sizeof(Type *) + i] = tolower(text[i]);
}
// store in member
_buffer = buffer;
}
/**
* Hide pointer in buffer
* @param pointer
* @param text
*/
HiddenPointer(Type *pointer, const std::string &text) :
HiddenPointer(pointer, text.c_str(), text.size()) {}
/**
* Constructor to retrieve the object given a buffer
* @param text The visible text
*/
HiddenPointer(const char *text) :
_buffer(text - sizeof(Type *)), // the buffer starts before the actual text
_allocated(false) {} // no memory was allocated
/**
* Copy constructor
* @param that
*/
HiddenPointer(const HiddenPointer<Type> &that) : _allocated(that._allocated)
{
// is the other object allocated?
if (_allocated)
{
// allocate this object too, call other constructor
HiddenPointer(that, that);
}
else
{
// just copy the data
_buffer = that._buffer;
}
}
/**
* Move constructor
* @param that
*/
HiddenPointer(HiddenPointer<Type> &&that) _NOEXCEPT : _allocated(that._allocated), _buffer(that._buffer)
{
// the other object is no longer allocated
that._allocated = false;
}
/**
* Destructor
*/
virtual ~HiddenPointer()
{
// destruct data
if (_allocated) delete[] _buffer;
}
/**
* Assignment operator
* @param that
* @return HiddenPointer
*/
HiddenPointer<Type> &operator=(const HiddenPointer &that)
{
// skip self assignmend
if (this == &that) return *this;
// deallocate current object
if (_allocated) delete[] _buffer;
// copy allocated setting
_allocated = that._allocated;
// is the other object allocated?
if (_allocated)
{
// allocate this object too, call constructor
HiddenPointer(that, that);
}
else
{
// just copy the data
_buffer = that._buffer;
}
// done
return *this;
}
/**
* Retrieve the pointer
* @return Type*
*/
operator Type * () const
{
// type is stored in front of the buffer
return *((Type **)_buffer);
}
/**
* Retrieve the text
* @return const char *
*/
operator const char * () const
{
// name starts a number of bytes further
return _buffer + sizeof(Type *);
}
/**
* Derefence the pointer
* @return Type*
*/
Type *operator->() const
{
// type is stored in front of the buffer
return *((Type **)_buffer);
}
private:
/**
* Buffer that holds both the pointer and the text - the text starts
* a number of bytes further up
* @var buffer
*/
const char *_buffer = nullptr;
/**
* Was this allocated?
* @var bool
*/
bool _allocated = true;
};
/**
* End of namespace
*/
}
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