C++ read_byte函数代码示例

int handle_input(struct plyr *p){
    int z;
        
    z = read_byte(p->fd);

    if(z == -1){
      return 1;
    }

      
    if(z == 0 || z == 1) return 0;
    p->lastinput = time(NULL);

    printf("user input: @ (%d,%d) = %d\n",p->x,p->y,z);
   
    if(z == 0x1b){
      handle_escapes(p);
    }
    else if(z == 253U)
    {
      read_byte(p->fd); //3
    }
    else if(z == 255U){
      read_byte(p->fd); //1
      dump_world(p);
    } else if(z == 126 || z == 127)
    {
      move_left(p);
      set_byte(p, ' ');
      CHARAT(p,p->x,p->y) = ' ';
    }
    else if(z == 13)
    {
      move_down(p);
    } else if(z == 10){
     
    } else {
      set_byte(p, z);
      move_right(p);
    }

  return 0;    
}

void packet_17(char *buffer,int *offset,int *flag) {
    /* display information contained within packet 17 */
    short spare,boxes,rows,numbytes;
    int i,j;
    int k;
    unsigned char run;
    unsigned char level;

    printf("Packet 17: Digital Precipitation Data Array Packet\n");
    spare=read_half(buffer,offset);
    spare=read_half(buffer,offset);
    boxes=read_half(buffer,offset);
    printf("Number of LFM Boxes in Row = %hd\n",boxes );
    rows=read_half(buffer,offset);
    printf("Number of Rows = %hd\n",rows);

    for(i=0; i<rows; i++) {
        numbytes=read_half(buffer,offset);
        printf("Number of Bytes in Row %d = %hd\n",i+1,numbytes);

        k=0;

        for(j=0; j<numbytes/2; j++) {
            run = (unsigned char) read_byte(buffer,offset);
            level = (unsigned char) read_byte(buffer,offset);
            /*  report pre-build 8 byte swap error */
            if((i==0) && (j==0) && (run==255))
                printf("Linux DPA Error, the Run and Level values are reversed in packet 17.\n");
            printf("Run(%03hd) Level(%03hd)  ", run, level);
            if(k==2) {
                printf("\n");
                k=0;
            } else {
                k++;
            }
        }
        printf("\n");
    }

    printf("\n");
    printf("Message 17 Complete\n");

}

unsigned char memory_read(struct _asm_context *asm_context, uint32_t address)
{
  if (address >= asm_context->memory.size)
  {
    printf("Warning: Data read address %d overran %d byte boundary at %s:%d\n", address, asm_context->memory.size, asm_context->filename, asm_context->line);
    return 0;
  }

  return read_byte(&asm_context->memory, address);
}

EEPROM_MAP_END

#define EEPROM_MAP_SIZE (sizeof(eeprom_map)/sizeof(*eeprom_map))

bool EEPROM::hasCalibration()
{
  int16_t read = read_byte(EEPROM_CAL_PROG);

  return read == 1;
}

void ADD_SP_r8(struct machine_t *gem) {
    struct cpu_t *cpu = gem->cpu;
	word before = cpu->sp;
	cpu->sp += read_byte(gem, cpu->pc);
	cpu->pc++;
	cpu->z = 0;
	cpu->n = 0;
	cpu->hc = ((before & 0x0FFF) > (cpu->hl & 0x0FFF))? 1 : 0;
	cpu->ca = (before > cpu->hl)? 1 : 0;
}

 bool read_value(uint8_t& value)
 {
     int v = read_byte();
     if (v < 0)
     {
         return false;
     }
     value = (uint8_t)v;
     return true;
 }

/* Reads the status register with checksum (8-bit) */
char ShtReadStatus(unsigned char *p_value, int datapin){
	unsigned char error=0;
	/* unsigned char checksum=0; */ /* Don't see the need of this yet */

	transstart(datapin); 			/* Transmission start */
	error = write_byte(STATUS_REG_R, datapin); 	/* Send command to sensor */
	*p_value = read_byte(datapin); 	/* Read status register (8-bit) */
	/* checksum = read_byte(); */	/* Read checksum (8-bit) */
	return error; 	/* error=1 in case of no response form the sensor */
}

/* Reads until the next tag, and returns its code */
static int read_next_tag(FILE * file, int *eof)
{
  int c;
  *eof = 0;

  /* Discard non 0xFF bytes */
  do {
    c = read_byte(file, eof);
    if(*eof)
      return 0xFF;
  } while(c != 0xFF);

  do {
    c = read_byte(file, eof);
    if(*eof)
      return 0xFF;
  } while (c == 0xFF);
  return c;
}

/* Copy a block of memory from the Transterpreter's possibly-virtual memory
   space into real memory. */
static void memcpy_from_tvm (BYTEPTR from, void *to, int size) {
	uint8_t *real_to = (uint8_t *) to;

	while (size > 0) {
		*real_to = read_byte (from);
		from = byteptr_plus (from, 1);
		++real_to;
		--size;
	}
}

 void IStream::end()
 {
     Byte8 byte;
     read_byte(byte);
     if (byte != End)
     {
         RCF::Exception e(RCF::_SfError_DataFormat(), "no end symbol");
         RCF_THROW(e)(byte);
     }
 }

static bfd_boolean
skip_leb128 (bfd_byte **iter, bfd_byte *end)
{
  unsigned char byte;
  do
    if (!read_byte (iter, end, &byte))
      return FALSE;
  while (byte & 0x80);
  return TRUE;
}

uint32_t read_4bytes_endian(uint32_t *cpt, FILE *f,uint8_t Endian)
{
	if ( Endian == 0 ) { // BigEndian
		uint32_t oct1 = 0;
		uint32_t oct2 = 0;
		oct1 = read_2bytes_endian(cpt,f,Endian);
		oct2 = read_2bytes_endian(cpt,f,Endian);
		return (oct1 << 16) + oct2;
	} else if ( Endian == 1 ) { // LittleEndian
		uint8_t oct1,oct2,oct3,oct4;
		oct1 =read_byte(cpt,f);
		oct2 =read_byte(cpt,f);
		oct3 =read_byte(cpt,f);
		oct4 =read_byte(cpt,f);
		return (oct4 << 24) + (oct3 << 16) + (oct2 << 8) + oct1;
	}
	return 0;

}

uint16_t read_2bytes_endian(uint32_t *cpt, FILE *f, uint8_t Endian)

{
	if ( Endian == 0 ) { // BigEndian
		uint16_t oct1 = 0;
		uint16_t oct2 = 0;
		oct1 = read_byte(cpt,f);
		oct2 = read_byte(cpt,f);
		return (oct1 << 8) + oct2;
	} else if ( Endian == 1 ) { // LittleEndian
		uint16_t oct1 = 0;
		uint16_t oct2 = 0;
		oct1 = read_byte(cpt,f);
		oct2 = read_byte(cpt,f);
		return (oct2 << 8) + oct1;
	}
	return 0;

}

/**
 * @brief Reads MCT marker.
 *
 * @param buffer
 * @param img
*/ 
void read_mct_marker(type_buffer *buffer, type_image *img) {
	int marker;
	int length;
	uint16_t Smct;
	uint8_t type;
	int i;

	/* Read MCT Marker */
	marker = read_buffer(buffer, 2);
	if(marker != MCT)
	{
		println_var(INFO, "Error: Expected MCT marker instead of %x", marker);
	}

	length = read_buffer(buffer, 4)-5;

	/* Read Smct */
	Smct = read_byte(buffer);
	
	type = (Smct&(3<<4))>>4;

	type_mct* old_mcts = img->mct_data->mcts[type];
	img->mct_data->mcts[type] = (type_mct*)realloc(img->mct_data->mcts[type], sizeof(type_mct) * (++img->mct_data->mcts_count[type]));
	type_mct* mct = &img->mct_data->mcts[type][img->mct_data->mcts_count[type]-1];
	
	if(img->mct_data->mcts[type] == NULL) {
		img->mct_data->mcts[type] = old_mcts;
		--img->mct_data->mcts_count[type];
		println_var(INFO, "Error: Memory reallocation failed! Ignoring MCT with Smct %u Skipping data", Smct);
		for(i=0; i<length-1; ++i) {
			read_byte(buffer);
		}
	} else {
		mct->index = Smct&0x0F;
		mct->type = type;
		mct->element_type = (Smct&(3<<6))>>6;
		mct->length = length/(1<<mct->element_type);
		mct->data = (uint8_t*)malloc(length);
		for(i=0; i<length; ++i) {
			mct->data[i] = read_byte(buffer);
		}
	}
}

/**
 * Parse username and password
 */
static int parse_auth(SSH *ssh) {
	byte *p;
	byte *out;
	byte aux;
	word32 outSz;

	p = ssh->sp.data;

	/* Get username */
	read_bin(&p, &out, &outSz);

	/* Size valid? */
	if (outSz > MAX_UN_LEN)
		return -1;

	memcpy(ssh->user, out, outSz);
	ssh->user[outSz] = 0;

	/* Get service */
	read_bin(&p, &out, &outSz);

	/* Get method */
	read_bin(&p, &out, &outSz);

	/* Only support password based autentication */
	if (memcmp(out, PASSWORD_STR, strlen(PASSWORD_STR)) != 0) {
		return 1;
	}

	/* Read byte */
	read_byte(&p, &aux);

	/* Get password */
	read_bin(&p, &out, &outSz);

	/* Size valid? */
	if (outSz > MAX_PW_LEN)
		return -1;

	memcpy(ssh->pass, out, outSz);
	ssh->pass[outSz] = 0;

	/* Check username and password */
	if (check_password(ssh->user, ssh->pass) < 0) {
		/* Limit auth attempts */
		if (ssh->authAtt++ > 1) {
			return -1;
		}
		return 1;
	}

	ssh->state = SSH_AUTH;

	return 0;
}