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BUG#:7124
TITLE: HP-UX PA-RISC 11.00 - Nightly tests failing

DESCRIPTION: The Bugfix reduces the impact on memory usage introduced by the OrderedSet implementation. To do this data structures are made dynamically allocated(not static as before) and the minimal capacity of the used Buffer is reduced to 64 bytes.
The constructor of the Buffer class now allows to specify how large the minimum capacity of the Buffer shall be.

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#ifndef Pegasus_Buffer_h
#define Pegasus_Buffer_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/Linkage.h>
#include <cstring>

PEGASUS_NAMESPACE_BEGIN

struct BufferRep
{
    Uint32 size;
    Uint32 cap;
    char data[1];
};

class PEGASUS_COMMON_LINKAGE Buffer
{
public:

    Buffer(Uint32 minCap=2048);

    Buffer(const Buffer& x);

    Buffer(const char* data, Uint32 size, Uint32 minCap=2048);

    ~Buffer();

    Buffer& operator=(const Buffer& x);

    void swap(Buffer& x);

    Uint32 size() const;

    Uint32 capacity() const;

    /**
        Returns a pointer to a character buffer with the Buffer contents.
        The character buffer is null-terminated even if the Buffer contents
        do not include a null termination character.
     */
    const char* getData() const;

    char get(Uint32 i) const;

    void set(Uint32 i, char x);

    const char& operator[](Uint32 i) const;

    void reserveCapacity(Uint32 cap);

    void grow(Uint32 size, char x = '\0');

    void append(char x);

    void append(const char* data, Uint32 size);

    void append(char c1, char c2, char c3, char c4);

    void append(
        char c1, char c2, char c3, char c4, char c5, char c6, char c7, char c8);

    void insert(Uint32 pos, const char* data, Uint32 size);

    void remove(Uint32 pos, Uint32 size);

    void remove(Uint32 pos);

    void clear();

private:

    void _reserve_aux(Uint32 cap);

    void _append_char_aux();

    BufferRep* _rep;
    static BufferRep _empty_rep;
    Uint32 _minCap;
};

inline Buffer::Buffer(Uint32 minCap) : _rep(&_empty_rep), _minCap(minCap)
{    
}

inline Buffer::~Buffer()
{
    if (_rep->cap != 0)
        free(_rep);
}

inline void Buffer::swap(Buffer& x)
{
    BufferRep* tmp = _rep;
    _rep = x._rep;
    x._rep = tmp;
}

inline Uint32 Buffer::size() const
{
    return _rep->size;
}

inline Uint32 Buffer::capacity() const
{
    return _rep->cap;
}

inline const char* Buffer::getData() const
{
    if (_rep->cap == 0)
    {
        const_cast<Buffer*>(this)->_append_char_aux();
    }

    _rep->data[_rep->size] = '\0';

    return _rep->data;
}

inline char Buffer::get(Uint32 i) const
{
    return _rep->data[i];
}

inline void Buffer::set(Uint32 i, char x)
{
    _rep->data[i] = x;
}

inline const char& Buffer::operator[](Uint32 i) const
{
    return _rep->data[i];
}

inline void Buffer::reserveCapacity(Uint32 cap)
{
    if (cap > _rep->cap)
        _reserve_aux(cap);
}

inline void Buffer::grow(Uint32 size, char x)
{
    Uint32 cap = _rep->size + size;

    if (cap > _rep->cap)
        _reserve_aux(cap);

    memset(_rep->data + _rep->size, x, size);
    _rep->size += size;
}

inline void Buffer::append(char x)
{
    if (_rep->size == _rep->cap)
        _append_char_aux();

    _rep->data[_rep->size++] = x;
}

inline void Buffer::append(const char* data, Uint32 size)
{
    Uint32 cap = _rep->size + size;

    if (cap > _rep->cap)
        _reserve_aux(cap);

    memcpy(_rep->data + _rep->size, data, size);
    _rep->size += size;
}

inline void Buffer::clear()
{
    if (_rep->cap != 0)
        _rep->size = 0;
}

inline void Buffer::remove(Uint32 pos)
{
    remove(pos, 1);
}

inline void Buffer::append(char c1, char c2, char c3, char c4)
{
    Uint32 cap = _rep->size + 4;

    if (cap > _rep->cap)
        _reserve_aux(cap);

    char* p = _rep->data + _rep->size;
    p[0] = c1;
    p[1] = c2;
    p[2] = c3;
    p[3] = c4;
    _rep->size += 4;
}

inline void Buffer::append(
    char c1, char c2, char c3, char c4, char c5, char c6, char c7, char c8)
{
    Uint32 cap = _rep->size + 8;

    if (cap > _rep->cap)
        _reserve_aux(cap);

    char* p = _rep->data + _rep->size;
    p[0] = c1;
    p[1] = c2;
    p[2] = c3;
    p[3] = c4;
    p[4] = c5;
    p[5] = c6;
    p[6] = c7;
    p[7] = c8;
    _rep->size += 8;
}

inline bool operator==(const Buffer& x, const Buffer& y)
{
    return memcmp(x.getData(), y.getData(), x.size()) == 0;
}

PEGASUS_NAMESPACE_END

#endif /* Pegasus_Buffer_h */