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| 4b03ae | 1 | #include "stdafx.h" |
| Q | 2 | #include "MyCircularBuf.h" |
| 3 | //CMyCircularBuf | |
| 4 | CMyCircularBuf::CMyCircularBuf() | |
| 5 | { | |
| 6 | pBuffer=NULL; | |
| 7 | nDataSize=0; | |
| 8 | bIsEmpty=true; | |
| 9 | bIsFull=false; | |
| 10 | } | |
| 11 | CMyCircularBuf::CMyCircularBuf(int nCapicity) | |
| 12 | { | |
| 13 | Alloc(nCapicity); | |
| 14 | } | |
| 15 | CMyCircularBuf::~CMyCircularBuf() | |
| 16 | { | |
| 17 | if (pBuffer!=NULL) {delete [] pBuffer;pBuffer=NULL;} | |
| 18 | } | |
| 19 | int CMyCircularBuf::Alloc(int nCapicity) | |
| 20 | { | |
| 21 | if (pBuffer!=NULL) {delete [] pBuffer;pBuffer=NULL;} | |
| 22 | pBuffer=new char[nCapicity]; | |
| 23 | nmCapacity=nCapicity; | |
| 24 | nDataSize=0; | |
| 25 | ReadP=0;WriteP=0; | |
| 26 | bIsEmpty=true; | |
| 27 | bIsFull=false; | |
| 28 | return nCapicity; | |
| 29 | } | |
| 30 | int CMyCircularBuf::GetCapicity() | |
| 31 | { | |
| 32 | return nmCapacity; | |
| 33 | } | |
| 34 | int CMyCircularBuf::GetNextWriteP(int nOffset) | |
| 35 | { | |
| 36 | int nextip=WriteP+nOffset; | |
| 37 | if (nextip>=nmCapacity) {nextip-=nmCapacity;} | |
| 38 | return nextip; | |
| 39 | } | |
| 40 | int CMyCircularBuf::GetNextReadP(int nOffset) | |
| 41 | { | |
| 42 | int nextop=ReadP+nOffset; | |
| 43 | if (nextop>=nmCapacity) {nextop-=nmCapacity;} | |
| 44 | return nextop; | |
| 45 | } | |
| 46 | int CMyCircularBuf::GetTailRoomSize() | |
| 47 | { | |
| 48 | int nTailLeftSize; | |
| 49 | if (bIsFull) {nTailLeftSize=0; return nTailLeftSize;} | |
| 50 | if (WriteP<ReadP) {nTailLeftSize=ReadP-WriteP;} | |
| 51 | else {nTailLeftSize=nmCapacity-WriteP;} | |
| 52 | return nTailLeftSize; | |
| 53 | } | |
| 54 | int CMyCircularBuf::GetTailDataSize() | |
| 55 | { | |
| 56 | int nTailLeftDataSize; | |
| 57 | if (bIsEmpty) return 0; | |
| 58 | if (WriteP>ReadP) nTailLeftDataSize=WriteP-ReadP; | |
| 59 | else {nTailLeftDataSize=nmCapacity-ReadP;} | |
| 60 | return nTailLeftDataSize; | |
| 61 | } | |
| 62 | int CMyCircularBuf::GetLeftRoomSize() | |
| 63 | { | |
| 64 | int nLeftSize=nmCapacity-nDataSize; | |
| 65 | return nLeftSize; | |
| 66 | } | |
| 67 | int CMyCircularBuf::GetDataSize() | |
| 68 | { | |
| 69 | return nDataSize; | |
| 70 | } | |
| 71 | char * CMyCircularBuf::GetWriteBuffer(int * LeftRoomSize) | |
| 72 | { | |
| 73 | int nTailLeftRoomSize=GetTailRoomSize(); | |
| 74 | *LeftRoomSize=nTailLeftRoomSize; | |
| 75 | return pBuffer+WriteP; | |
| 76 | } | |
| 77 | int CMyCircularBuf::ReleaseWriteBuffer(int AddSize) | |
| 78 | { | |
| 79 | WriteP=GetNextWriteP(AddSize); | |
| 80 | nDataSize+=AddSize; | |
| 81 | bIsEmpty=false; | |
| 82 | if (nDataSize>=nmCapacity) bIsFull=true; | |
| 83 | ||
| 84 | return AddSize; | |
| 85 | } | |
| 86 | char * CMyCircularBuf::GetReadBuffer(int * DataSize) | |
| 87 | { | |
| 88 | int nTailLeftDataSize=GetTailDataSize(); | |
| 89 | *DataSize=nTailLeftDataSize; | |
| 90 | return pBuffer+ReadP; | |
| 91 | } | |
| 92 | int CMyCircularBuf::ReleaseReadBuffer(int DelSize) | |
| 93 | { | |
| 94 | DelData(DelSize); | |
| 95 | return DelSize; | |
| 96 | } | |
| 97 | ||
| 98 | int CMyCircularBuf::PushIn(void * pData,int Size) | |
| 99 | { | |
| 100 | if (GetLeftRoomSize()<Size) {return -1;} | |
| 101 | int nTailLeftSize=GetTailRoomSize(); | |
| 102 | if (nTailLeftSize>=Size) | |
| 103 | { | |
| 104 | memcpy_s(pBuffer+WriteP,nTailLeftSize,pData,Size); | |
| 105 | WriteP=GetNextWriteP(Size); | |
| 106 | }else | |
| 107 | { | |
| 108 | memcpy_s(pBuffer+WriteP,nTailLeftSize,pData,nTailLeftSize); | |
| 109 | memcpy_s(pBuffer,Size-nTailLeftSize,(char *)pData+nTailLeftSize,Size-nTailLeftSize); | |
| 110 | WriteP=GetNextWriteP(Size); | |
| 111 | } | |
| 112 | bIsEmpty=false; | |
| 113 | nDataSize+=Size; | |
| 114 | if (nDataSize==nmCapacity) {bIsFull=true;} | |
| 115 | return Size; | |
| 116 | } | |
| 117 | int CMyCircularBuf::CopyData(void * pData,int Size) | |
| 118 | { | |
| 119 | if (GetDataSize()<Size) {return -1;} | |
| 120 | int nTailLeftSize=GetTailDataSize(); //环形缓冲尾部剩余数据量 | |
| 121 | if (nTailLeftSize<Size) ////剩余空间小，将数据转移到一起 | |
| 122 | { | |
| 123 | memcpy_s(pData,Size,pBuffer+ReadP,nTailLeftSize); | |
| 124 | memcpy_s((char *)pData+nTailLeftSize,Size-nTailLeftSize,pBuffer,Size-nTailLeftSize); | |
| 125 | }else | |
| 126 | { | |
| 127 | memcpy_s(pData,Size,pBuffer+ReadP,Size); | |
| 128 | } | |
| 129 | return Size; | |
| 130 | } | |
| 131 | int CMyCircularBuf::DelData(int Size) | |
| 132 | { | |
| 133 | if (GetDataSize()<Size) {return -1;} | |
| 134 | bIsFull=false; | |
| 135 | ReadP=GetNextReadP(Size); | |
| 136 | nDataSize-=Size; | |
| 137 | if (nDataSize==0) {bIsEmpty=true;} | |
| 138 | return Size; | |
| 139 | } | |
| 140 | ||
| 141 | int CMyCircularBuf::PopOut(void * pData,int Size) | |
| 142 | { | |
| 143 | CopyData(pData,Size); | |
| 144 | DelData(Size); | |
| 145 | return Size; | |
| 146 | } | |
