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39
40#ifndef QDATABUFFER_P_H
41#define QDATABUFFER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/private/qtguiglobal_p.h>
55#include "QtCore/qbytearray.h"
56
57#include <stdlib.h>
58
59QT_BEGIN_NAMESPACE
60
61template <typename Type> class QDataBuffer
62{
63 Q_DISABLE_COPY_MOVE(QDataBuffer)
64public:
65 QDataBuffer(int res)
66 {
67 capacity = res;
68 if (res) {
69 buffer = (Type*) malloc(capacity * sizeof(Type));
70 Q_CHECK_PTR(buffer);
71 } else {
72 buffer = nullptr;
73 }
74 siz = 0;
75 }
76
77 ~QDataBuffer()
78 {
79 if (buffer)
80 free(buffer);
81 }
82
83 inline void reset() { siz = 0; }
84
85 inline bool isEmpty() const { return siz==0; }
86
87 inline int size() const { return siz; }
88 inline Type *data() const { return buffer; }
89
90 inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
91 inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
92 inline Type &last() { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
93 inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
94 inline Type &first() { Q_ASSERT(!isEmpty()); return buffer[0]; }
95 inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; }
96
97 inline void add(const Type &t) {
98 reserve(siz + 1);
99 buffer[siz] = t;
100 ++siz;
101 }
102
103 inline void pop_back() {
104 Q_ASSERT(siz > 0);
105 --siz;
106 }
107
108 inline void resize(int size) {
109 reserve(size);
110 siz = size;
111 }
112
113 inline void reserve(int size) {
114 if (size > capacity) {
115 if (capacity == 0)
116 capacity = 1;
117 while (capacity < size)
118 capacity *= 2;
119 buffer = (Type*) realloc(buffer, capacity * sizeof(Type));
120 Q_CHECK_PTR(buffer);
121 }
122 }
123
124 inline void shrink(int size) {
125 capacity = size;
126 if (size) {
127 buffer = (Type*) realloc(buffer, capacity * sizeof(Type));
128 Q_CHECK_PTR(buffer);
129 } else {
130 free(buffer);
131 buffer = nullptr;
132 }
133 }
134
135 inline void swap(QDataBuffer<Type> &other) {
136 qSwap(capacity, other.capacity);
137 qSwap(siz, other.siz);
138 qSwap(buffer, other.buffer);
139 }
140
141 inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; }
142
143private:
144 int capacity;
145 int siz;
146 Type *buffer;
147};
148
149QT_END_NAMESPACE
150
151#endif // QDATABUFFER_P_H
152