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    41 

    42 #ifndef QDATABUFFER_P_H

    43 #define QDATABUFFER_P_H

    44 

    45 //

    46 //  W A R N I N G

    47 //  -------------

    48 //

    49 // This file is not part of the Qt API.  It exists for the convenience

    50 // of other Qt classes.  This header file may change from version to

    51 // version without notice, or even be removed.

    52 //

    53 // We mean it.

    54 //

    55 

    56 #include "QtCore/qbytearray.h"

    57 

    58 QT_BEGIN_NAMESPACE

    59 

    60 template <typename Type> class QDataBuffer

    61 {

    62 public:

    63     QDataBuffer(int res = 64)

    64     {

    65         capacity = res;

    66         buffer = (Type*) qMalloc(capacity * sizeof(Type));

    67         siz = 0;

    68     }

    69 

    70     ~QDataBuffer()

    71     {

    72         qFree(buffer);

    73     }

    74 

    75     inline void reset() { siz = 0; }

    76 

    77     inline bool isEmpty() const { return siz==0; }

    78 

    79     inline int size() const { return siz; }

    80     inline Type *data() const { return buffer; }

    81 

    82     inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }

    83     inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }

    84     inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }

    85     inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; }

    86 

    87     inline void add(const Type &t) {

    88         reserve(siz + 1);

    89         buffer[siz] = t;

    90         ++siz;

    91     }

    92 

    93     inline void resize(int size) {

    94         reserve(size);

    95         siz = size;

    96     }

    97 

    98     inline void reserve(int size) {

    99         if (size > capacity) {

   100             while (capacity < size)

   101                 capacity *= 2;

   102             buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));

   103         }

   104     }

   105 

   106     inline void shrink(int size) {

   107         capacity = size;

   108         buffer = (Type*) qRealloc(buffer, capacity * sizeof(Type));

   109     }

   110 

   111     inline void swap(QDataBuffer<Type> &other) {

   112         qSwap(capacity, other.capacity);

   113         qSwap(siz, other.siz);

   114         qSwap(buffer, other.buffer);

   115     }

   116 

   117     inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; }

   118 

   119 private:

   120     int capacity;

   121     int siz;

   122     Type *buffer;

   123 };

   124 

   125 QT_END_NAMESPACE

   126 

   127 #endif // QDATABUFFER_P_H