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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