[2c47b73] | 1 | /** |
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| 2 | * @file CompressElement.c |
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| 3 | * @author Sheng Di |
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| 4 | * @date May, 2016 |
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| 5 | * @brief Functions of CompressElement |
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| 6 | * (C) 2015 by Mathematics and Computer Science (MCS), Argonne National Laboratory. |
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| 7 | * See COPYRIGHT in top-level directory. |
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| 8 | */ |
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| 9 | |
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| 10 | #pragma GCC diagnostic push |
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| 11 | #pragma GCC diagnostic ignored "-Wchar-subscripts" |
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| 12 | |
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| 13 | #include <stdlib.h> |
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| 14 | #include <stdio.h> |
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| 15 | #include <math.h> |
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| 16 | #include <sz.h> |
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| 17 | #include <CompressElement.h> |
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| 18 | |
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| 19 | char* decompressGroupIDArray(unsigned char* bytes, size_t dataLength) |
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| 20 | { |
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| 21 | HuffmanTree* huffmanTree = SZ_Reset(); //create a default huffman tree |
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| 22 | int* standGroupID = (int*)malloc(dataLength*sizeof(int)); |
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| 23 | decode_withTree(huffmanTree, bytes, dataLength, standGroupID); |
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| 24 | SZ_ReleaseHuffman(huffmanTree); |
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| 25 | |
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| 26 | char* groupID = (char*)malloc(dataLength*sizeof(char)); |
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| 27 | size_t i = 0; |
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| 28 | int lastGroupIDValue = 0, curStandIDValue = 0, curGroupIDValue = 0; |
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| 29 | int offset = 2*(GROUP_COUNT + 2); |
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| 30 | |
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| 31 | curGroupIDValue = groupID[0] = standGroupID[0] - GROUP_COUNT; |
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| 32 | lastGroupIDValue = curGroupIDValue; |
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| 33 | for(i=1;i<dataLength;i++) |
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| 34 | { |
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| 35 | curStandIDValue = standGroupID[i]; |
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| 36 | curGroupIDValue = curStandIDValue + lastGroupIDValue - offset; |
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| 37 | lastGroupIDValue = curGroupIDValue; |
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| 38 | groupID[i] = curGroupIDValue; |
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| 39 | } |
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| 40 | free(standGroupID); |
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| 41 | |
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| 42 | return groupID; |
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| 43 | } |
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| 44 | |
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| 45 | inline short computeGroupNum_float(float value) |
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| 46 | { |
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| 47 | short expo = getExponent_float(value); |
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| 48 | if(expo < 0) |
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| 49 | expo = -1; |
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| 50 | return expo; |
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| 51 | } |
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| 52 | |
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| 53 | inline short computeGroupNum_double(double value) |
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| 54 | { |
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| 55 | short expo = getExponent_double(value); |
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| 56 | if(expo < 0) |
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| 57 | expo = -1; |
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| 58 | return expo; |
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| 59 | } |
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| 60 | |
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| 61 | /** |
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| 62 | * Add preceding neighbor values to a buffer. |
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| 63 | * @param last3CmprsData buffer |
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| 64 | * @param value the value to be added to the buffer |
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| 65 | * */ |
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| 66 | inline void listAdd_double(double last3CmprsData[3], double value) |
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| 67 | { |
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| 68 | last3CmprsData[2] = last3CmprsData[1]; |
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| 69 | last3CmprsData[1] = last3CmprsData[0]; |
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| 70 | last3CmprsData[0] = value; |
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| 71 | } |
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| 72 | |
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| 73 | inline void listAdd_float(float last3CmprsData[3], float value) |
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| 74 | { |
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| 75 | last3CmprsData[2] = last3CmprsData[1]; |
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| 76 | last3CmprsData[1] = last3CmprsData[0]; |
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| 77 | last3CmprsData[0] = value; |
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| 78 | } |
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| 79 | |
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| 80 | inline void listAdd_int(int64_t last3CmprsData[3], int64_t value) |
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| 81 | { |
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| 82 | last3CmprsData[2] = last3CmprsData[1]; |
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| 83 | last3CmprsData[1] = last3CmprsData[0]; |
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| 84 | last3CmprsData[0] = value; |
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| 85 | } |
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| 86 | |
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| 87 | inline void listAdd_float_group(float *groups, int *flags, char groupNum, float oriValue, float decValue, char* curGroupID) |
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| 88 | { |
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| 89 | if(groupNum>=0) |
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| 90 | { |
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| 91 | if(flags[groupNum]==0) |
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| 92 | flags[groupNum] = 1; |
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| 93 | groups[groupNum] = decValue; |
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| 94 | } |
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| 95 | else |
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| 96 | { |
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| 97 | groups[0] = decValue; |
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| 98 | flags[0] = 1; |
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| 99 | } |
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| 100 | |
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| 101 | if(oriValue>=0) |
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| 102 | *curGroupID = groupNum+2; //+[-1,0,1,2,3,....,16] is mapped to [1,2,....,18] |
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| 103 | else |
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| 104 | *curGroupID = -(groupNum+2); //-[-1,0,1,2,3,....,16] is mapped to [-1,-2,....,-18] |
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| 105 | } |
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| 106 | |
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| 107 | inline void listAdd_double_group(double *groups, int *flags, char groupNum, double oriValue, double decValue, char* curGroupID) |
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| 108 | { |
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| 109 | if(groupNum>=0) |
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| 110 | { |
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| 111 | if(flags[groupNum]==0) |
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| 112 | flags[groupNum] = 1; |
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| 113 | groups[groupNum] = decValue; |
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| 114 | } |
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| 115 | else |
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| 116 | { |
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| 117 | groups[0] = decValue; |
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| 118 | flags[0] = 1; |
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| 119 | } |
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| 120 | |
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| 121 | if(oriValue>=0) |
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| 122 | *curGroupID = groupNum+2; //+[-1,0,1,2,3,....,16] is mapped to [1,2,....,18] |
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| 123 | else |
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| 124 | *curGroupID = -(groupNum+2); //-[-1,0,1,2,3,....,16] is mapped to [-1,-2,....,-18] |
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| 125 | } |
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| 126 | |
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| 127 | /** |
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| 128 | * Determine whether the prediction value minErr is valid. |
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| 129 | * |
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| 130 | * */ |
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| 131 | inline int validPrediction_double(double minErr, double precision) |
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| 132 | { |
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| 133 | if(minErr<=precision) |
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| 134 | return 1; |
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| 135 | else |
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| 136 | return 0; |
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| 137 | } |
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| 138 | |
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| 139 | inline int validPrediction_float(float minErr, float precision) |
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| 140 | { |
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| 141 | if(minErr<=precision) |
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| 142 | return 1; |
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| 143 | else |
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| 144 | return 0; |
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| 145 | } |
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| 146 | |
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| 147 | double* generateGroupErrBounds(int errorBoundMode, double realPrecision, double pwrErrBound) |
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| 148 | { |
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| 149 | double pwrError; |
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| 150 | double* result = (double*)malloc(GROUP_COUNT*sizeof(double)); |
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| 151 | int i = 0; |
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| 152 | for(i=0;i<GROUP_COUNT;i++) |
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| 153 | { |
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| 154 | pwrError = ((double)pow(2, i))*pwrErrBound; |
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| 155 | switch(errorBoundMode) |
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| 156 | { |
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| 157 | case ABS_AND_PW_REL: |
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| 158 | case REL_AND_PW_REL: |
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| 159 | result[i] = pwrError<realPrecision?pwrError:realPrecision; |
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| 160 | break; |
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| 161 | case ABS_OR_PW_REL: |
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| 162 | case REL_OR_PW_REL: |
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| 163 | result[i] = pwrError<realPrecision?realPrecision:pwrError; |
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| 164 | break; |
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| 165 | case PW_REL: |
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| 166 | result[i] = pwrError; |
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| 167 | break; |
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| 168 | } |
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| 169 | |
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| 170 | } |
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| 171 | return result; |
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| 172 | } |
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| 173 | |
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| 174 | int generateGroupMaxIntervalCount(double* groupErrBounds) |
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| 175 | { |
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| 176 | int i = 0; |
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| 177 | int maxCount = 0, count = 0; |
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| 178 | for(i=0;i<GROUP_COUNT;i++) |
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| 179 | { |
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| 180 | count = (int)(pow(2, i)/groupErrBounds[i] + 0.5); |
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| 181 | if(maxCount<count) |
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| 182 | maxCount = count; |
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| 183 | } |
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| 184 | |
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| 185 | return maxCount; |
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| 186 | } |
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| 187 | |
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| 188 | void new_LossyCompressionElement(LossyCompressionElement *lce, int leadingNum, unsigned char* intMidBytes, |
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| 189 | int intMidBytes_Length, int resiMidBitsLength, int resiBits) |
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| 190 | { |
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| 191 | lce->leadingZeroBytes = leadingNum; //0,1,2,or 3 |
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| 192 | memcpy(lce->integerMidBytes,intMidBytes,intMidBytes_Length); |
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| 193 | lce->integerMidBytes_Length = intMidBytes_Length; //they are mid_bits actually |
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| 194 | lce->resMidBitsLength = resiMidBitsLength; |
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| 195 | lce->residualMidBits = resiBits; |
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| 196 | } |
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| 197 | |
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| 198 | void updateLossyCompElement_Double(unsigned char* curBytes, unsigned char* preBytes, |
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| 199 | int reqBytesLength, int resiBitsLength, LossyCompressionElement *lce) |
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| 200 | { |
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| 201 | int resiIndex, intMidBytes_Length = 0; |
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| 202 | int leadingNum = compIdenticalLeadingBytesCount_double(preBytes, curBytes); //in fact, float is enough for both single-precision and double-precisiond ata. |
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| 203 | int fromByteIndex = leadingNum; |
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| 204 | int toByteIndex = reqBytesLength; //later on: should use "< toByteIndex" to tarverse.... |
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| 205 | if(fromByteIndex < toByteIndex) |
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| 206 | { |
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| 207 | intMidBytes_Length = reqBytesLength - leadingNum; |
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| 208 | memcpy(lce->integerMidBytes, &(curBytes[fromByteIndex]), intMidBytes_Length); |
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| 209 | } |
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| 210 | int resiBits = 0; |
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| 211 | if(resiBitsLength!=0) |
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| 212 | { |
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| 213 | resiIndex = reqBytesLength; |
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| 214 | if(resiIndex < 8) |
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| 215 | resiBits = (curBytes[resiIndex] & 0xFF) >> (8-resiBitsLength); |
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| 216 | } |
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| 217 | lce->leadingZeroBytes = leadingNum; |
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| 218 | lce->integerMidBytes_Length = intMidBytes_Length; |
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| 219 | lce->resMidBitsLength = resiBitsLength; |
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| 220 | lce->residualMidBits = resiBits; |
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| 221 | } |
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| 222 | |
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| 223 | void updateLossyCompElement_Float(unsigned char* curBytes, unsigned char* preBytes, |
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| 224 | int reqBytesLength, int resiBitsLength, LossyCompressionElement *lce) |
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| 225 | { |
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| 226 | int resiIndex, intMidBytes_Length = 0; |
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| 227 | int leadingNum = compIdenticalLeadingBytesCount_float(preBytes, curBytes); //in fact, float is enough for both single-precision and double-precisiond ata. |
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| 228 | int fromByteIndex = leadingNum; |
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| 229 | int toByteIndex = reqBytesLength; //later on: should use "< toByteIndex" to tarverse.... |
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| 230 | if(fromByteIndex < toByteIndex) |
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| 231 | { |
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| 232 | intMidBytes_Length = reqBytesLength - leadingNum; |
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| 233 | memcpy(lce->integerMidBytes, &(curBytes[fromByteIndex]), intMidBytes_Length); |
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| 234 | } |
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| 235 | int resiBits = 0; |
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| 236 | if(resiBitsLength!=0) |
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| 237 | { |
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| 238 | resiIndex = reqBytesLength; |
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| 239 | if(resiIndex < 8) |
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| 240 | resiBits = (curBytes[resiIndex] & 0xFF) >> (8-resiBitsLength); |
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| 241 | } |
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| 242 | lce->leadingZeroBytes = leadingNum; |
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| 243 | lce->integerMidBytes_Length = intMidBytes_Length; |
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| 244 | lce->resMidBitsLength = resiBitsLength; |
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| 245 | lce->residualMidBits = resiBits; |
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| 246 | } |
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| 247 | |
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| 248 | #pragma GCC diagnostic pop |
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