GY-63_MS5611/libraries/Soundex/Soundex.cpp

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//
// FILE: Soundex.cpp
// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// DATE: 2022-02-05
// PURPOSE: Arduino Library for calculating Soundex hash
// URL: https://github.com/RobTillaart/Soundex
#include "Soundex.h"
Soundex::Soundex()
{
_buffer[0] = '\0';
_length = 4;
}
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void Soundex::setLength(uint8_t length)
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{
_length = length;
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if (_length < SOUNDEX_MIN_LENGTH)
{
_length = SOUNDEX_MIN_LENGTH;
}
else if (_length > (SOUNDEX_MAX_LENGTH - 1))
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{
_length = SOUNDEX_MAX_LENGTH - 1;
}
};
char * Soundex::soundex(const char * str)
{
uint8_t i = 0; // index for the buffer.
// fill buffer with zeros
for (i = 0; i < _length; i++) _buffer[i] = '0';
_buffer[_length] = '\0';
// find begin of word, skip spaces, digits
char *p = (char *) &str[0];
while((*p != 0) && (isalpha(*p) == false)) p++;
if (*p == 0) return _buffer;
// handle first character
i = 0;
_buffer[i++] = toupper(*p);
uint8_t last = sdx[_buffer[0] - 'A']; // remember last code
p++;
// process the remainder of the string
while ((*p != 0) && (i < _length))
{
if (isalpha(*p)) // skip non ASCII
{
uint8_t current = sdx[toupper(*p) - 'A'];
// new code?
if (last != current)
{
last = current;
if (last != 0) _buffer[i++] = '0' + last;
}
}
p++;
}
return _buffer;
}
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// reference implementation
uint16_t Soundex::soundex16(const char * str)
{
uint8_t tmp = _length;
_length = 5;
char *p = soundex(str);
_length = tmp;
uint16_t value = (p[0] - 'A');
for (uint8_t i = 1; i < 5; i++)
{
value *= 7;
value += (p[i] - '0');
}
return value;
}
// reference implementation
uint32_t Soundex::soundex32(const char * str)
{
uint8_t tmp = _length;
_length = 10;
char *p = soundex(str);
_length = tmp;
uint32_t value = (p[0] - 'A');
for (uint8_t i = 1; i < 10; i++)
{
value *= 7;
value += (p[i] - '0');
}
return value;
}
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// -- END OF FILE --