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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 | |
59 | QT_BEGIN_NAMESPACE |
60 | |
61 | template <typename Type> class QDataBuffer |
62 | { |
63 | Q_DISABLE_COPY_MOVE(QDataBuffer) |
64 | public: |
65 | QDataBuffer(int res) |
66 | { |
67 | capacity = res; |
68 | if (res) { |
69 | QT_WARNING_PUSH |
70 | QT_WARNING_DISABLE_GCC("-Walloc-size-larger-than=" ) |
71 | buffer = (Type*) malloc(size: capacity * sizeof(Type)); |
72 | QT_WARNING_POP |
73 | Q_CHECK_PTR(buffer); |
74 | } else { |
75 | buffer = nullptr; |
76 | } |
77 | siz = 0; |
78 | } |
79 | |
80 | ~QDataBuffer() |
81 | { |
82 | if (buffer) |
83 | free(buffer); |
84 | } |
85 | |
86 | inline void reset() { siz = 0; } |
87 | |
88 | inline bool isEmpty() const { return siz==0; } |
89 | |
90 | inline int size() const { return siz; } |
91 | inline Type *data() const { return buffer; } |
92 | |
93 | inline Type &at(int i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; } |
94 | inline const Type &at(int i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; } |
95 | inline Type &last() { Q_ASSERT(!isEmpty()); return buffer[siz-1]; } |
96 | inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; } |
97 | inline Type &first() { Q_ASSERT(!isEmpty()); return buffer[0]; } |
98 | inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; } |
99 | |
100 | inline void add(const Type &t) { |
101 | reserve(size: siz + 1); |
102 | buffer[siz] = t; |
103 | ++siz; |
104 | } |
105 | |
106 | inline void pop_back() { |
107 | Q_ASSERT(siz > 0); |
108 | --siz; |
109 | } |
110 | |
111 | inline void resize(int size) { |
112 | reserve(size); |
113 | siz = size; |
114 | } |
115 | |
116 | inline void reserve(int size) { |
117 | if (size > capacity) { |
118 | if (capacity == 0) |
119 | capacity = 1; |
120 | while (capacity < size) |
121 | capacity *= 2; |
122 | buffer = (Type*) realloc(buffer, capacity * sizeof(Type)); |
123 | Q_CHECK_PTR(buffer); |
124 | } |
125 | } |
126 | |
127 | inline void shrink(int size) { |
128 | capacity = size; |
129 | if (size) { |
130 | buffer = (Type*) realloc(buffer, capacity * sizeof(Type)); |
131 | Q_CHECK_PTR(buffer); |
132 | } else { |
133 | free(buffer); |
134 | buffer = nullptr; |
135 | } |
136 | } |
137 | |
138 | inline void swap(QDataBuffer<Type> &other) { |
139 | qSwap(capacity, other.capacity); |
140 | qSwap(siz, other.siz); |
141 | qSwap(buffer, other.buffer); |
142 | } |
143 | |
144 | inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; } |
145 | |
146 | private: |
147 | int capacity; |
148 | int siz; |
149 | Type *buffer; |
150 | }; |
151 | |
152 | QT_END_NAMESPACE |
153 | |
154 | #endif // QDATABUFFER_P_H |
155 | |