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C語言實現(xiàn)多字節(jié)與整型數(shù)據(jù)的相互轉(zhuǎn)換

發(fā)布人:電子禪石 時間:2021-11-19 來源:工程師 發(fā)布文章

數(shù)據(jù)類型定義

typedef   signed          char int8_t;

typedef   signed short     int int16_t;

typedef   signed           int int32_t;

typedef   signed       __INT64 int64_t;

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1、將多字節(jié)(2、4、8字節(jié))轉(zhuǎn)換為整型數(shù)據(jù)(16、32、64位)

(舉例:2字節(jié) {0x12, 0x34} → 16位整型 0x1234)

(舉例:4字節(jié) {0x12, 0x34, 0x56, 0x78} → 32位整型 0x12345678)

(舉例:8字節(jié) {0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56} → 64位整型 0x1234567890123456)

/***************************

函數(shù)名:   ArrayToVariable

功能描述: 將多字節(jié)(2、4、8字節(jié))轉(zhuǎn)換為整型數(shù)據(jù)(16、32、64位)

參數(shù):    Array:  待轉(zhuǎn)換數(shù)組

         Length: 待轉(zhuǎn)換數(shù)組的長度

返回:    轉(zhuǎn)換后的整型數(shù)據(jù)

***************************/

uint64_t ArrayToVariable(uint8_t *Array, uint8_t Length)

{

uint64_t Variable = 0;

if(Length == 2)

{

Variable = (((uint16_t)Array[0] << 8)  + ((uint16_t)Array[1]));

}

else if(Length == 4)

{

Variable = (((uint32_t)Array[0] << 24) + ((uint32_t)Array[1] << 16) 

  + ((uint32_t)Array[2] << 8)  + ((uint32_t)Array[3]));

}

else if(Length == 8)

{

Variable = (((uint64_t)Array[0] << 56) + ((uint64_t)Array[1] << 48) 

          + ((uint64_t)Array[2] << 40) + ((uint64_t)Array[3] << 32) 

          + ((uint64_t)Array[4] << 24) + ((uint64_t)Array[5] << 16) 

  + ((uint64_t)Array[6] << 8)  + ((uint64_t)Array[7]));

}

return Variable;

}


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2、將16位整型數(shù)據(jù)轉(zhuǎn)換為2字節(jié)

(舉例: 16位整型數(shù)據(jù) 0x1234 → 2字節(jié)數(shù)組 {0x12,0x34})

/***************************

函數(shù)名:   Variable16ToArray

功能描述: 將16位整型數(shù)據(jù)轉(zhuǎn)換為2字節(jié)

參數(shù):    Variable:待轉(zhuǎn)換的16位整型數(shù)據(jù) 

Array:轉(zhuǎn)換后的2字節(jié)數(shù)組

***************************/

void Variable16ToArray(uint8_t *Array, uint32_t Variable)

{

*(Array)     = (uint8_t)(Variable >> 8);

*(Array + 1) = (uint8_t)(Variable);

}


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3、將32位整型數(shù)據(jù)轉(zhuǎn)換為4字節(jié)

(舉例: 32位整型數(shù)據(jù) 0x12345678 → 4字節(jié)數(shù)組 {0x12,0x34,0x56,0x78})

/***************************

函數(shù)名:   Variable32ToArray

功能描述: 將32位整型數(shù)據(jù)轉(zhuǎn)換為4字節(jié)

參數(shù):    Variable:待轉(zhuǎn)換的32位整型數(shù)據(jù) 

Array:轉(zhuǎn)換后的4字節(jié)數(shù)組

***************************/

void Variable32ToArray(uint8_t *Array, uint32_t Variable)

{

*(Array)     = (uint8_t)(Variable >> 24);

*(Array + 1) = (uint8_t)(Variable >> 16);

*(Array + 2) = (uint8_t)(Variable >> 8);

*(Array + 3) = (uint8_t)(Variable);

}


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4、將64位整型數(shù)據(jù)轉(zhuǎn)換為8字節(jié)

(舉例: 64位整型數(shù)據(jù) 0x1234567890123456 → 4字節(jié)數(shù)組 {0x12,0x34,0x56,0x78,0x90,0x12,0x34,0x56})

/***************************

函數(shù)名:   Variable64ToArray

功能描述: 將64位整型數(shù)據(jù)轉(zhuǎn)換為8字節(jié)

參數(shù):    Variable:待轉(zhuǎn)換的64位整型數(shù)據(jù) 

Array:轉(zhuǎn)換后的8字節(jié)數(shù)組

***************************/

void Variable64ToArray(uint8_t *Array, uint64_t Variable)

{

*(Array) = (uint8_t)(Variable >> 56);

*(Array + 1) = (uint8_t)(Variable >> 48);

*(Array + 2) = (uint8_t)(Variable >> 40);

*(Array + 3) = (uint8_t)(Variable >> 32);

*(Array + 4) = (uint8_t)(Variable >> 24);

*(Array + 5) = (uint8_t)(Variable >> 16);

*(Array + 6) = (uint8_t)(Variable >> 8);

*(Array + 7) = (uint8_t)(Variable);

}


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原文鏈接:https://blog.csdn.net/lnfiniteloop/article/details/120015554


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