[81] | 1 | #include "../include/Endianness.h" |
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| 2 | #include <iostream> |
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| 3 | |
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| 4 | namespace environment { |
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| 5 | namespace endianness { |
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| 6 | |
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| 7 | /* |
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| 8 | * swapBytes -> change the endiannes |
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| 9 | * exemple for 16 and size_access = 4, [0123456789abcdef] -> [32107654ba98fedc] |
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| 10 | */ |
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| 11 | char * swapBytes (char * string_src , uint32_t size_string, uint32_t size_access) |
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| 12 | { |
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| 13 | char string_tmp [size_string]; |
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| 14 | |
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| 15 | if ( (size_access == 1) or |
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| 16 | (size_access > size_string)) |
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| 17 | return string_src; |
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| 18 | |
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| 19 | // if (size_string % size_access != 0) |
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| 20 | // { |
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| 21 | // std::cerr << "<swapBytes> : Size of string must be a multiple of size_access." << std::endl; |
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| 22 | // exit(1); |
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| 23 | // } |
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| 24 | |
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| 25 | // size_access : |
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| 26 | // 1 -> bytes |
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| 27 | // 2 -> half |
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| 28 | // 4 -> word |
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| 29 | // 8 -> doubleword |
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| 30 | |
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| 31 | memcpy (string_tmp,string_src,size_string); |
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| 32 | |
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| 33 | // Loop to reorganize the string |
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| 34 | for (uint32_t i = 0 ; i < size_string; i += size_access) |
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| 35 | { |
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| 36 | switch (size_access) |
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| 37 | { |
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| 38 | case 2 : |
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| 39 | { |
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| 40 | string_src[i+0] = string_tmp[i+1]; |
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| 41 | string_src[i+1] = string_tmp[i+0]; |
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| 42 | break; |
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| 43 | } |
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| 44 | case 4 : |
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| 45 | { |
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| 46 | string_src[i+0] = string_tmp[i+3]; |
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| 47 | string_src[i+1] = string_tmp[i+2]; |
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| 48 | string_src[i+2] = string_tmp[i+1]; |
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| 49 | string_src[i+3] = string_tmp[i+0]; |
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| 50 | break; |
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| 51 | } |
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| 52 | case 8 : |
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| 53 | { |
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| 54 | string_src[i+0] = string_tmp[i+7]; |
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| 55 | string_src[i+1] = string_tmp[i+6]; |
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| 56 | string_src[i+2] = string_tmp[i+5]; |
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| 57 | string_src[i+3] = string_tmp[i+4]; |
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| 58 | string_src[i+4] = string_tmp[i+3]; |
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| 59 | string_src[i+5] = string_tmp[i+2]; |
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| 60 | string_src[i+6] = string_tmp[i+1]; |
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| 61 | string_src[i+7] = string_tmp[i+0]; |
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| 62 | break; |
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| 63 | } |
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| 64 | default : |
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| 65 | { |
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| 66 | std::cerr << "<swapBytes> : Illegal size of access (size_access = " << size_access << ")" << std::endl; |
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| 67 | exit(1); |
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| 68 | break; |
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| 69 | } |
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| 70 | }//end switch(size_access) |
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| 71 | }//end i |
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| 72 | |
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| 73 | return string_src; |
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| 74 | } |
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| 75 | |
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| 76 | }; |
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| 77 | }; |
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