[807] | 1 | /********************************************************************** |
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| 2 | * Include file with Base Class of Marshalgen * |
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| 3 | **********************************************************************/ |
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| 4 | |
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| 5 | #ifndef MARSHALEDOBJ_H |
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| 6 | #define MARSHALEDOBJ_H |
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| 7 | |
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| 8 | #include <stdio.h> |
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| 9 | #include <stdlib.h> |
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| 10 | #include <string.h> |
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| 11 | #include <assert.h> |
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| 12 | |
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| 13 | #define MSH_ASSERT(X) {assert(X);} |
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| 14 | |
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| 15 | #define MSH_HEADER_SIZE (sizeof(int)*2) |
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| 16 | // the first field (first sizeof(int) bytes) contains the $TYPE_CHOICE |
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| 17 | // the second field contains the size including the header |
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| 18 | #define MSH_TOTALSIZE_OFFSET (sizeof(int)) |
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| 19 | #define MSH_TYPECHOICE_OFFSET 0 |
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| 20 | |
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| 21 | #define MSH_SET_TYPECHOICE(X) { memcpy(msh_buffer+MSH_TYPECHOICE_OFFSET,&(X),sizeof(int));} |
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| 22 | #define MSH_SET_TOTALSIZE(X) { memcpy(msh_buffer+MSH_TOTALSIZE_OFFSET,&(X),sizeof(int));} |
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| 23 | #define MSH_GET_TYPECHOICE(X,BUF) { memcpy(&(X), ((char*)BUF)+MSH_TYPECHOICE_OFFSET,sizeof(int));} |
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| 24 | #define MSH_GET_TOTALSIZE(X,BUF) { memcpy(&(X), ((char*)BUF)+MSH_TOTALSIZE_OFFSET,sizeof(int));} |
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| 25 | |
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| 26 | |
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| 27 | class MarshaledObj { |
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| 28 | private: |
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| 29 | // Make sure all marshaled objects are word aligned. |
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| 30 | static const int WORD_SIZE = sizeof(long); |
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| 31 | public: |
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| 32 | static int ROUND_UP( int x ){ |
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| 33 | return (((x)+(WORD_SIZE-1)) / WORD_SIZE) * WORD_SIZE; |
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| 34 | } |
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| 35 | |
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| 36 | public: |
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| 37 | // Constructs an empty MarshaledObj, |
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| 38 | MarshaledObj(){ |
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| 39 | msh_extent = 128; |
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| 40 | msh_size = MSH_HEADER_SIZE; |
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| 41 | msh_isUnmarshalDone = false; |
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| 42 | |
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| 43 | msh_buffer = (char *)malloc(msh_extent); |
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| 44 | MSH_ASSERT(msh_buffer); |
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| 45 | |
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| 46 | msh_cursor = msh_buffer + MSH_HEADER_SIZE; |
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| 47 | msh_field_begin = msh_cursor; |
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| 48 | |
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| 49 | msh_typechoice = 0; |
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| 50 | int totalsize = msh_cursor-msh_buffer; |
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| 51 | |
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| 52 | MSH_SET_TYPECHOICE(msh_typechoice); |
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| 53 | MSH_SET_TOTALSIZE(totalsize); |
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| 54 | } |
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| 55 | |
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| 56 | //MarshaledObj(void *buf); |
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| 57 | // This constructs a MarshledObj from a buffer (of type char*) for unmarshaling. |
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| 58 | // buf is obtain from an already marshaled object. |
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| 59 | // The first field of buf must be an int that contains the size of the buf |
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| 60 | // NOT including itself. |
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| 61 | // isUnmarshaling must be 'u' (for unmarshaling) . |
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| 62 | MarshaledObj(void *buf, char isUnmarshaling) { |
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| 63 | msh_isUnmarshalDone = false; |
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| 64 | |
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| 65 | if(isUnmarshaling != 'u') { |
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| 66 | printf("MarshaledObj(void*, char): wrong argument\n"); |
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| 67 | return; |
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| 68 | } |
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| 69 | |
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| 70 | //msh_extent = ROUND_UP(*(int *)buf + sizeof(int)); |
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| 71 | MSH_GET_TYPECHOICE(msh_typechoice,buf); |
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| 72 | |
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| 73 | MSH_GET_TOTALSIZE(msh_size,buf); |
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| 74 | msh_extent = ROUND_UP(msh_size); |
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| 75 | |
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| 76 | msh_buffer = (char *)malloc(msh_extent); |
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| 77 | MSH_ASSERT(msh_buffer); |
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| 78 | |
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| 79 | memcpy(msh_buffer, (char *)buf, msh_extent); |
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| 80 | msh_cursor = msh_buffer + MSH_HEADER_SIZE; |
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| 81 | msh_field_begin = msh_cursor; |
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| 82 | |
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| 83 | //MSH_SET_TYPECHOICE(msh_typechoice); |
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| 84 | |
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| 85 | } |
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| 86 | |
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| 87 | ~MarshaledObj() { |
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| 88 | if ( ! isUnmarshaling() ) |
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| 89 | free(msh_buffer); |
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| 90 | } |
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| 91 | |
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| 92 | inline bool isUnmarshaling() { |
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| 93 | return (msh_extent <= 0); |
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| 94 | } |
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| 95 | |
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| 96 | private: |
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| 97 | // Dont use copy constructor |
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| 98 | const MarshaledObj& operator=(const MarshaledObj& right); |
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| 99 | |
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| 100 | protected: |
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| 101 | int msh_typechoice; // alias of $TYPE_CHOICE |
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| 102 | |
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| 103 | // points to the buffer (header+body) |
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| 104 | char *msh_buffer; |
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| 105 | |
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| 106 | // msh_field_begin points to the size of the current field being marshaled |
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| 107 | char* msh_field_begin; |
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| 108 | |
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| 109 | // msh_size contains the total size of msh_buffer. i.e., |
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| 110 | size_t msh_size; |
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| 111 | |
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| 112 | // msh_cursor points to the next field to be marshaled. |
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| 113 | char *msh_cursor; |
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| 114 | |
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| 115 | // msh_extent is the total allocated space for msh_buffer. |
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| 116 | // msh_extent is always >= msh_size |
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| 117 | size_t msh_extent; |
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| 118 | |
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| 119 | bool msh_isUnmarshalDone; //Is unmarshaling done yet? |
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| 120 | |
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| 121 | public: |
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| 122 | inline void EXTEND_BUFFER(int size){ |
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| 123 | msh_size += size; |
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| 124 | if(msh_size > msh_extent){ |
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| 125 | resizeBuffer(msh_size); |
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| 126 | } |
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| 127 | } |
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| 128 | |
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| 129 | void resizeBuffer(size_t new_size ) { |
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| 130 | int msh_displacement = msh_cursor - msh_buffer; |
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| 131 | int field_displacement = msh_field_begin - msh_buffer; |
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| 132 | |
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| 133 | while(new_size > msh_extent) |
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| 134 | msh_extent *= 2; |
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| 135 | |
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| 136 | msh_buffer = (char *)realloc( msh_buffer, msh_extent); |
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| 137 | MSH_ASSERT(msh_buffer); |
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| 138 | |
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| 139 | msh_cursor = msh_buffer + msh_displacement; |
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| 140 | msh_field_begin = msh_buffer + field_displacement; |
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| 141 | } |
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| 142 | |
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| 143 | public: |
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| 144 | // Returns the total size of buffer |
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| 145 | inline int getBufferSize() { |
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| 146 | return msh_size; |
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| 147 | } |
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| 148 | |
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| 149 | inline char *getBuffer() { |
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| 150 | return msh_buffer; |
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| 151 | } |
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| 152 | |
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| 153 | /* p: pointer to the data field, size: size of that primitive data field */ |
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| 154 | void marshalPrimitive(void* p, int size) { |
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| 155 | int msh_currentSize; |
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| 156 | if (isUnmarshaling()) |
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| 157 | throw "Tried to marshal in object marked isUnmarshaling = true"; |
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| 158 | msh_currentSize = size; |
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| 159 | EXTEND_BUFFER(msh_currentSize + sizeof(int)); |
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| 160 | |
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| 161 | // *(int *)msh_cursor = msh_currentSize; |
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| 162 | memcpy(msh_cursor, &msh_currentSize, sizeof(int)); |
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| 163 | msh_cursor += sizeof(int); |
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| 164 | memcpy(msh_cursor, p, size); |
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| 165 | msh_cursor += msh_currentSize; |
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| 166 | msh_size = msh_cursor - msh_buffer; |
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| 167 | |
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| 168 | MSH_SET_TOTALSIZE(msh_size); |
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| 169 | } |
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| 170 | |
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| 171 | void unmarshalPrimitive(void* p, int size) { |
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| 172 | int msh_currentSize; |
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| 173 | //memcpy(&msh_currentSize, msh_cursor, sizeof(int)); |
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| 174 | /* in case *msh_cursor is invalid, use "size" not to crash the memory */ |
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| 175 | msh_currentSize = size; |
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| 176 | msh_cursor += sizeof(int); |
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| 177 | memcpy(p, msh_cursor, msh_currentSize); |
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| 178 | msh_cursor += msh_currentSize; |
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| 179 | //msh_size = msh_cursor - msh_buffer; |
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| 180 | } |
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| 181 | }; |
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| 182 | |
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| 183 | /* Used for distinguish the class types of the template parameter |
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| 184 | vietha 2003.05.01 */ |
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| 185 | template <class T,class> |
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| 186 | class MSH_IsSameClass |
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| 187 | { |
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| 188 | public: |
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| 189 | enum {Is = 0}; |
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| 190 | }; |
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| 191 | |
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| 192 | template<class T> |
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| 193 | class MSH_IsSameClass<T,T> |
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| 194 | { |
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| 195 | public: |
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| 196 | enum {Is = 1}; |
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| 197 | }; |
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| 198 | |
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| 199 | #endif |
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