author | glx |
Wed, 06 Sep 2006 14:24:43 +0000 | |
changeset 4563 | 241260bd5505 |
parent 4549 | 106ed18a7675 |
child 5081 | fe3a6da19d9f |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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#ifndef BLOB_HPP |
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#define BLOB_HPP |
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template <class Titem_> |
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FORCEINLINE void MemCpyT(Titem_* d, const Titem_* s, int num_items = 1) |
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{ |
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memcpy(d, s, num_items * sizeof(Titem_)); |
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} |
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/** Base class for simple binary blobs. |
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* Item is byte. |
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* The word 'simple' means: |
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* - no configurable allocator type (always made from heap) |
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* - no smart deallocation - deallocation must be called from the same |
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* module (DLL) where the blob was allocated |
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* - no configurable allocation policy (how big blocks should be allocated) |
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* - no extra ownership policy (i.e. 'copy on write') when blob is copied |
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* - no thread synchronization at all */ |
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class CBlobBaseSimple { |
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protected: |
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struct CHdr { |
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int m_size; // actual blob size in bytes |
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int m_max_size; // maximum (allocated) size in bytes |
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}; |
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union { |
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int8 *m_pData; |
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CHdr *m_pHdr_1; |
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} ptr_u; |
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public: |
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ST_CONST(int, Ttail_reserve = 4); // four extra bytes will be always allocated and zeroed at the end |
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FORCEINLINE CBlobBaseSimple() { InitEmpty(); } |
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FORCEINLINE CBlobBaseSimple(const CBlobBaseSimple& src) |
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{ |
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InitEmpty(); |
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AppendRaw(src); |
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} |
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FORCEINLINE ~CBlobBaseSimple() { Free(); } |
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protected: |
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FORCEINLINE void InitEmpty() { static CHdr hdrEmpty[] = {{0, 0}, {0, 0}}; ptr_u.m_pHdr_1 = &hdrEmpty[1]; } |
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FORCEINLINE void Init(CHdr* hdr) { ptr_u.m_pHdr_1 = &hdr[1]; } |
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FORCEINLINE CHdr& Hdr() { return ptr_u.m_pHdr_1[-1]; } |
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FORCEINLINE const CHdr& Hdr() const { return ptr_u.m_pHdr_1[-1]; } |
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FORCEINLINE int& RawSizeRef() { return Hdr().m_size; }; |
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public: |
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FORCEINLINE bool IsEmpty() const { return RawSize() == 0; } |
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FORCEINLINE int RawSize() const { return Hdr().m_size; }; |
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FORCEINLINE int MaxRawSize() const { return Hdr().m_max_size; }; |
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FORCEINLINE int8* RawData() { return ptr_u.m_pData; } |
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FORCEINLINE const int8* RawData() const { return ptr_u.m_pData; } |
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FORCEINLINE uint32 Crc32() const {return CCrc32::Calc(RawData(), RawSize());} |
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FORCEINLINE void Clear() { RawSizeRef() = 0; } |
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FORCEINLINE void Free() { if (MaxRawSize() > 0) {RawFree(&Hdr()); InitEmpty();} } |
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FORCEINLINE void CopyFrom(const CBlobBaseSimple& src) { Clear(); AppendRaw(src); } |
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FORCEINLINE void MoveFrom(CBlobBaseSimple& src) { Free(); ptr_u.m_pData = src.ptr_u.m_pData; src.InitEmpty(); } |
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FORCEINLINE void Swap(CBlobBaseSimple& src) { int8 *tmp = ptr_u.m_pData; ptr_u.m_pData = src.ptr_u.m_pData; src.ptr_u.m_pData = tmp; } |
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FORCEINLINE void AppendRaw(int8 *p, int num_bytes) |
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{ |
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assert(p != NULL); |
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if (num_bytes > 0) { |
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memcpy(GrowRawSize(num_bytes), p, num_bytes); |
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} else { |
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assert(num_bytes >= 0); |
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} |
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} |
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FORCEINLINE void AppendRaw(const CBlobBaseSimple& src) |
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{ |
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if (!src.IsEmpty()) |
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memcpy(GrowRawSize(src.RawSize()), src.RawData(), src.RawSize()); |
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} |
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/** Reallocate if there is no free space for num_bytes bytes. |
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* @return pointer to the new data to be added */ |
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FORCEINLINE int8* MakeRawFreeSpace(int num_bytes) |
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{ |
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assert(num_bytes >= 0); |
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int new_size = RawSize() + num_bytes; |
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if (new_size > MaxRawSize()) SmartAlloc(new_size); |
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FixTail(); |
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return ptr_u.m_pData + RawSize(); |
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} |
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/** Increase RawSize() by num_bytes. |
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* @return pointer to the new data added */ |
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FORCEINLINE int8* GrowRawSize(int num_bytes) |
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{ |
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int8* pNewData = MakeRawFreeSpace(num_bytes); |
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RawSizeRef() += num_bytes; |
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return pNewData; |
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} |
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/** Decrease RawSize() by num_bytes. */ |
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FORCEINLINE void ReduceRawSize(int num_bytes) |
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{ |
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if (MaxRawSize() > 0 && num_bytes > 0) { |
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104 |
assert(num_bytes <= RawSize()); |
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|
105 |
if (num_bytes < RawSize()) RawSizeRef() -= num_bytes; |
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|
106 |
else RawSizeRef() = 0; |
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107 |
} |
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108 |
} |
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|
109 |
/** reallocate blob data if needed */ |
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|
110 |
void SmartAlloc(int new_size) |
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111 |
{ |
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|
112 |
int old_max_size = MaxRawSize(); |
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|
113 |
if (old_max_size >= new_size) return; |
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|
114 |
// calculate minimum block size we need to allocate |
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|
115 |
int min_alloc_size = sizeof(CHdr) + new_size + Ttail_reserve; |
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|
116 |
// ask allocation policy for some reasonable block size |
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|
117 |
int alloc_size = AllocPolicy(min_alloc_size); |
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118 |
// allocate new block |
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119 |
CHdr* pNewHdr = RawAlloc(alloc_size); |
3900
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120 |
// setup header |
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121 |
pNewHdr->m_size = RawSize(); |
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122 |
pNewHdr->m_max_size = alloc_size - (sizeof(CHdr) + Ttail_reserve); |
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123 |
// copy existing data |
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124 |
if (RawSize() > 0) |
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|
125 |
memcpy(pNewHdr + 1, ptr_u.m_pData, pNewHdr->m_size); |
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126 |
// replace our block with new one |
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127 |
CHdr* pOldHdr = &Hdr(); |
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128 |
Init(pNewHdr); |
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129 |
if (old_max_size > 0) |
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130 |
RawFree(pOldHdr); |
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131 |
} |
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132 |
/** simple allocation policy - can be optimized later */ |
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133 |
FORCEINLINE static int AllocPolicy(int min_alloc) |
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134 |
{ |
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135 |
if (min_alloc < (1 << 9)) { |
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|
136 |
if (min_alloc < (1 << 5)) return (1 << 5); |
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|
137 |
return (min_alloc < (1 << 7)) ? (1 << 7) : (1 << 9); |
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138 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
139 |
if (min_alloc < (1 << 15)) { |
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|
140 |
if (min_alloc < (1 << 11)) return (1 << 11); |
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|
141 |
return (min_alloc < (1 << 13)) ? (1 << 13) : (1 << 15); |
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|
142 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
143 |
if (min_alloc < (1 << 20)) { |
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|
144 |
if (min_alloc < (1 << 17)) return (1 << 17); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
145 |
return (min_alloc < (1 << 19)) ? (1 << 19) : (1 << 20); |
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|
146 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
147 |
min_alloc = (min_alloc | ((1 << 20) - 1)) + 1; |
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|
148 |
return min_alloc; |
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149 |
} |
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150 |
|
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|
151 |
/** all allocation should happen here */ |
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|
152 |
static FORCEINLINE CHdr* RawAlloc(int num_bytes) { return (CHdr*)malloc(num_bytes); } |
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|
153 |
/** all deallocations should happen here */ |
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|
154 |
static FORCEINLINE void RawFree(CHdr* p) { free(p); } |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
155 |
/** fixing the four bytes at the end of blob data - useful when blob is used to hold string */ |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
156 |
FORCEINLINE void FixTail() |
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|
157 |
{ |
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|
158 |
if (MaxRawSize() > 0) { |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
159 |
int8 *p = &ptr_u.m_pData[RawSize()]; |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
160 |
for (int i = 0; i < Ttail_reserve; i++) p[i] = 0; |
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|
161 |
} |
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162 |
} |
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163 |
}; |
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164 |
|
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165 |
template <class Titem_, class Tbase_ = CBlobBaseSimple> |
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|
166 |
class CBlobT : public CBlobBaseSimple { |
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|
167 |
// make template arguments public: |
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|
168 |
public: |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
169 |
typedef Titem_ Titem; |
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170 |
typedef Tbase_ Tbase; |
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171 |
|
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|
172 |
ST_CONST(int, Titem_size = sizeof(Titem)); |
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|
173 |
|
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|
174 |
FORCEINLINE CBlobT() : Tbase() {} |
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|
175 |
FORCEINLINE CBlobT(const Tbase& src) : Tbase(src) {assert((RawSize() % Titem_size) == 0);} |
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|
176 |
FORCEINLINE ~CBlobT() { Free(); } |
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|
177 |
FORCEINLINE void CheckIdx(int idx) { assert(idx >= 0); assert(idx < Size()); } |
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|
178 |
FORCEINLINE Titem* Data() { return (Titem*)RawData(); } |
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|
179 |
FORCEINLINE const Titem* Data() const { return (const Titem*)RawData(); } |
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|
180 |
FORCEINLINE Titem* Data(int idx) { CheckIdx(idx); return (Data() + idx); } |
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|
181 |
FORCEINLINE const Titem* Data(int idx) const { CheckIdx(idx); return (Data() + idx); } |
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parents:
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|
182 |
FORCEINLINE int Size() const { return (RawSize() / Titem_size); } |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
183 |
FORCEINLINE void Free() |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
184 |
{ |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
185 |
assert((RawSize() % Titem_size) == 0); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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parents:
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|
186 |
int old_size = Size(); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
187 |
if (old_size > 0) { |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
188 |
// destroy removed items; |
2c84ed52709d
(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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parents:
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|
189 |
Titem* pI_last_to_destroy = Data(0); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
190 |
for (Titem* pI = Data(old_size - 1); pI >= pI_last_to_destroy; pI--) pI->~Titem_(); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
191 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
192 |
Tbase::Free(); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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193 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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parents:
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|
194 |
FORCEINLINE Titem* GrowSizeNC(int num_items) { return (Titem*)GrowRawSize(num_items * Titem_size); } |
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|
195 |
FORCEINLINE Titem* GrowSizeC(int num_items) |
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196 |
{ |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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parents:
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|
197 |
Titem* pI = GrowSizeNC(num_items); |
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198 |
for (int i = num_items; i > 0; i--, pI++) new (pI) Titem(); |
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199 |
} |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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200 |
FORCEINLINE void ReduceSize(int num_items) |
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201 |
{ |
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|
202 |
assert((RawSize() % Titem_size) == 0); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
203 |
int old_size = Size(); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
204 |
assert(num_items <= old_size); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
205 |
int new_size = (num_items <= old_size) ? (old_size - num_items) : 0; |
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|
206 |
// destroy removed items; |
2c84ed52709d
(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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|
207 |
Titem* pI_last_to_destroy = Data(new_size); |
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(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
KUDr
parents:
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for (Titem* pI = Data(old_size - 1); pI >= pI_last_to_destroy; pI--) pI->~Titem(); |
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// remove them |
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ReduceRawSize(num_items * Titem_size); |
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211 |
} |
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FORCEINLINE Titem* AppendNew() |
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213 |
{ |
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Titem& dst = *GrowSizeNC(1); |
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Titem* pNewItem = new (&dst) Titem(); |
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return pNewItem; |
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217 |
} |
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FORCEINLINE Titem* Append(const Titem& src) |
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219 |
{ |
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Titem& dst = *GrowSizeNC(1); |
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Titem* pNewItem = new (&dst) Titem(src); |
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return pNewItem; |
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223 |
} |
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FORCEINLINE Titem* Append(const Titem* pSrc, int num_items) |
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225 |
{ |
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226 |
Titem* pDst = GrowSizeNC(num_items); |
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Titem* pDstOrg = pDst; |
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Titem* pDstEnd = pDst + num_items; |
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while (pDst < pDstEnd) new (pDst++) Titem(*(pSrc++)); |
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return pDstOrg; |
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231 |
} |
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FORCEINLINE void RemoveBySwap(int idx) |
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233 |
{ |
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CheckIdx(idx); |
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// destroy removed item |
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Titem* pRemoved = Data(idx); |
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RemoveBySwap(pRemoved); |
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238 |
} |
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239 |
FORCEINLINE void RemoveBySwap(Titem* pItem) |
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240 |
{ |
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241 |
Titem* pLast = Data(Size() - 1); |
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assert(pItem >= Data() && pItem <= pLast); |
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243 |
// move last item to its new place |
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if (pItem != pLast) { |
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pItem->~Titem_(); |
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new (pItem) Titem_(*pLast); |
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247 |
} |
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// destroy the last item |
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pLast->~Titem_(); |
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250 |
// and reduce the raw blob size |
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ReduceRawSize(Titem_size); |
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252 |
} |
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FORCEINLINE Titem* MakeFreeSpace(int num_items) { return (Titem*)MakeRawFreeSpace(num_items * Titem_size); } |
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254 |
}; |
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255 |
|
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256 |
// simple string implementation |
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257 |
struct CStrA : public CBlobT<char> |
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258 |
{ |
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typedef CBlobT<char> base; |
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CStrA(const char* str = NULL) {Append(str);} |
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FORCEINLINE CStrA(const CBlobBaseSimple& src) : base(src) {} |
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void Append(const char* str) {if (str != NULL && str[0] != '\0') base::Append(str, (int)strlen(str));} |
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263 |
}; |
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264 |
|
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265 |
#endif /* BLOB_HPP */ |