Arduino C / C ++更改函数名称

Question

嘿，我刚接触C世界，这是我的问题。

我有以下.h和.cpp文件，如下所示：

。H：

#ifndef Sha256_h
#define Sha256_h
#include "sha256_config.h"

#if defined(SHA256_LINUX)
    class Sha256Class
#else
    class Sha256Class : public Print
#endif
{
  public:
    union _buffer {
        uint8_t b[BLOCK_LENGTH];
        uint32_t w[BLOCK_LENGTH/4];
    };

    union _state {
        uint8_t b[HASH_LENGTH];
        uint32_t w[HASH_LENGTH/4];
    };

    void init(void);
    void initHmac(const uint8_t* secret, int secretLength);
    uint8_t* result(void);
    uint8_t* resultHmac(void);

    #if  defined(SHA256_LINUX)
        virtual size_t write(uint8_t);
        size_t write_L(const char *str);
        size_t write_L(const uint8_t *buffer, size_t size);
        size_t print(const char* str);  
        double millis();
    #else
        virtual size_t write(uint8_t);
        using Print::write;
    #endif

  private:
    void pad();
    void addUncounted(uint8_t data);
    void hashBlock();
    uint32_t ror32(uint32_t number, uint8_t bits);
    _buffer buffer;
    uint8_t bufferOffset;
    _state state;
    uint32_t byteCount;
    uint8_t keyBuffer[BLOCK_LENGTH];
    uint8_t innerHash[HASH_LENGTH];

    #if defined(SHA256_LINUX)
        timeval tv;
    #endif
};

extern Sha256Class Sha256;
#endif

的.cpp：

#include "sha256.h"

uint32_t sha256K[] PROGMEM = {
  0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
  0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
  0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
  0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
  0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
  0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
  0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
  0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
};

#define BUFFER_SIZE 64

uint8_t sha256InitState[] PROGMEM = {
  0x67,0xe6,0x09,0x6a,
  0x85,0xae,0x67,0xbb,
  0x72,0xf3,0x6e,0x3c,
  0x3a,0xf5,0x4f,0xa5,
  0x7f,0x52,0x0e,0x51,
  0x8c,0x68,0x05,0x9b,
  0xab,0xd9,0x83,0x1f,
  0x19,0xcd,0xe0,0x5b
};

void Sha256Class::init(void) {
  memcpy_P(state.b,sha256InitState,32);
  byteCount = 0;
  bufferOffset = 0;
}

uint32_t Sha256Class::ror32(uint32_t number, uint8_t bits) {
  return ((number << (32-bits)) | (number >> bits));
}

void Sha256Class::hashBlock() {
  uint8_t i;
  uint32_t a,b,c,d,e,f,g,h,t1,t2;

  a=state.w[0];
  b=state.w[1];
  c=state.w[2];
  d=state.w[3];
  e=state.w[4];
  f=state.w[5];
  g=state.w[6];
  h=state.w[7];

  for (i=0; i<64; i++) {
    if (i>=16) {
      t1 = buffer.w[i&15] + buffer.w[(i-7)&15];
      t2 = buffer.w[(i-2)&15];
      t1 += ror32(t2,17) ^ ror32(t2,19) ^ (t2>>10);
      t2 = buffer.w[(i-15)&15];
      t1 += ror32(t2,7) ^ ror32(t2,18) ^ (t2>>3);
      buffer.w[i&15] = t1;
    }

    t1 = h;
    t1 += ror32(e,6) ^ ror32(e,11) ^ ror32(e,25);
    t1 += g ^ (e & (g ^ f));
    t1 += pgm_read_dword(sha256K+i);
    t1 += buffer.w[i&15];
    t2 = ror32(a,2) ^ ror32(a,13) ^ ror32(a,22);
    t2 += ((b & c) | (a & (b | c)));
    h=g; g=f; f=e; e=d+t1; d=c; c=b; b=a; a=t1+t2;
  }

  state.w[0] += a;
  state.w[1] += b;
  state.w[2] += c;
  state.w[3] += d;
  state.w[4] += e;
  state.w[5] += f;
  state.w[6] += g;
  state.w[7] += h;
}

void Sha256Class::addUncounted(uint8_t data) {
  buffer.b[bufferOffset ^ 3] = data;
  bufferOffset++;

  if (bufferOffset == BUFFER_SIZE) {
    hashBlock();
    bufferOffset = 0;
  }
}

size_t Sha256Class::write(uint8_t data) {
  ++byteCount;
  addUncounted(data);

  return 1;
}

void Sha256Class::pad() {
  addUncounted(0x80);

  while (bufferOffset != 56) addUncounted(0x00);

  addUncounted(0);
  addUncounted(0);
  addUncounted(0);
  addUncounted(byteCount >> 29);
  addUncounted(byteCount >> 21);
  addUncounted(byteCount >> 13);
  addUncounted(byteCount >> 5);
  addUncounted(byteCount << 3);
}


uint8_t* Sha256Class::result(void) {
  pad();

  for (int i=0; i<8; i++) {
    uint32_t a,b;

    a=state.w[i];
    b=a<<24;
    b|=(a<<8) & 0x00ff0000;
    b|=(a>>8) & 0x0000ff00;
    b|=a>>24;
    state.w[i]=b;
  }

  return state.b;
}

#define HMAC_IPAD 0x36
#define HMAC_OPAD 0x5c

uint8_t keyBuffer[BLOCK_LENGTH];
uint8_t innerHash[HASH_LENGTH];

void Sha256Class::initHmac(const uint8_t* key, int keyLength) {
  uint8_t i;

  memset(keyBuffer,0,BLOCK_LENGTH);

  if (keyLength > BLOCK_LENGTH) {
    init();
    for (;keyLength--;) write(*key++);

    memcpy(keyBuffer,result(),HASH_LENGTH);
  } else {
    memcpy(keyBuffer,key,keyLength);
  }

  init();

  for (i=0; i<BLOCK_LENGTH; i++) {
    write(keyBuffer[i] ^ HMAC_IPAD);
  }
}

uint8_t* Sha256Class::resultHmac(void) {
  uint8_t i;

  memcpy(innerHash,result(),HASH_LENGTH);
  init();

  for (i=0; i<BLOCK_LENGTH; i++) write(keyBuffer[i] ^ HMAC_OPAD);
  for (i=0; i<HASH_LENGTH; i++) write(innerHash[i]);

  return result();
}

#if defined(SHA256_LINUX)
    size_t Sha256Class::write_L(const char *str){
        if (str == NULL) return 0;

        return write_L((const uint8_t *)str, strlen(str));
    }   

    size_t Sha256Class::write_L(const uint8_t *buffer,size_t size){
        size_t n = 0;

        while (size--){
            n +=write(*buffer++);
        }

        return n;
    }

    size_t Sha256Class::print(const char *str){
        return write_L(str);
    }

    double Sha256Class::millis(){
        gettimeofday(&tv, NULL);

        return (tv.tv_sec + 0.000001 * tv.tv_usec);
    }
#endif

Sha256Class Sha256;

我如何从Arduino代码中调用它是这样的：

uint8_t* hash;
uint32_t a;
unsigned long ms;
Serial.println("Test: RFC4231 4.2");
Serial.println("Expect:b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7");
Serial.print("Result:");
ms = micros();
Sha256.initHmac(hmacKey1,20);
Sha256.print("Hi There");
printHash(Sha256.resultHmac());
Serial.print(" Hash took : ");
Serial.print((micros() - ms));
Serial.println(" micros");
Serial.println();

我想要做的是将Sha256.print重命名为Sha256.Msg 。 我试图将类Sha256Class：public重命名为Sha256Class：public Msg，但是没有用。 我还引用了任何称为print的内容 ，并将其重命名为Msg-仍然无法使其正常工作。

Answer 1

您只需要在头文件中更改原型的名称，然后在cpp文件中更改实现的定义的名称，最后记住要在使用它的位置更改名称。

。H：

size_t print(const char* str); to size_t Msg(const char * str)

的.cpp：

size_t Sha256Class::print(const char *str){
    return write_L(str);
}

to

size_t Sha256Class::Msg(const char *str){
    return write_L(str);
}

arduino文件：

uint8_t* hash;
uint32_t a;
unsigned long ms;
Serial.println("Test: RFC4231 4.2");
Serial.println("Expect:b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7");
Serial.print("Result:");
ms = micros();
Sha256.initHmac(hmacKey1,20);
/* change from Sha256.print("Hi There") to */
Sha256.Msg("Hi There");
printHash(Sha256.resultHmac());
Serial.print(" Hash took : ");
Serial.print((micros() - ms));
Serial.println(" micros");
Serial.println();

但是，由于您在头文件中的原型周围#if defined(SHA256_LINUX)了#if defined(SHA256_LINUX) ，因此可能无法将其声明为Msg(const char *str)而不是print(const char *str)因此最好的解决方案是保留打印功能的实现，并创建另一个执行相同功能的方法。

回应评论。

。H：

// Add this somewhere in the code wherever you see fit
size_t Msg(const char * str);

的.cpp：

//Add this somewhere in the cide wherever you see fit
size_t Sha256Class::Msg(const char *str){
    return write_L(str);
}

然后，在arduino文件中，以新名称Sha256.Msg("Hi There");名义调用该函数Sha256.Msg("Hi There");