2022-02-06 10:08:32 -05:00
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//
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// FILE: Soundex.cpp
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// AUTHOR: Rob Tillaart
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2022-02-07 08:46:24 -05:00
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// VERSION: 0.1.2
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2022-02-06 10:08:32 -05:00
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// DATE: 2022-02-05
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// PURPOSE: Arduino Library for calculating Soundex hash
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// URL: https://github.com/RobTillaart/Soundex
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#include "Soundex.h"
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Soundex::Soundex()
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{
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_buffer[0] = '\0';
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_length = 4;
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}
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2022-02-07 08:46:24 -05:00
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void Soundex::setLength(uint8_t length)
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2022-02-06 10:08:32 -05:00
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{
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_length = length;
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2022-02-07 08:46:24 -05:00
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if (_length < SOUNDEX_MIN_LENGTH)
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{
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_length = SOUNDEX_MIN_LENGTH;
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}
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else if (_length > (SOUNDEX_MAX_LENGTH - 1))
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2022-02-06 10:08:32 -05:00
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{
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_length = SOUNDEX_MAX_LENGTH - 1;
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}
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};
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char * Soundex::soundex(const char * str)
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{
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uint8_t i = 0; // index for the buffer.
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// fill buffer with zeros
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for (i = 0; i < _length; i++) _buffer[i] = '0';
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_buffer[_length] = '\0';
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// find begin of word, skip spaces, digits
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char *p = (char *) &str[0];
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while((*p != 0) && (isalpha(*p) == false)) p++;
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if (*p == 0) return _buffer;
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// handle first character
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i = 0;
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_buffer[i++] = toupper(*p);
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uint8_t last = sdx[_buffer[0] - 'A']; // remember last code
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p++;
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// process the remainder of the string
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while ((*p != 0) && (i < _length))
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{
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if (isalpha(*p)) // skip non ASCII
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{
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uint8_t current = sdx[toupper(*p) - 'A'];
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// new code?
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if (last != current)
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{
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last = current;
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if (last != 0) _buffer[i++] = '0' + last;
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}
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}
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p++;
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}
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return _buffer;
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}
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2022-02-07 08:46:24 -05:00
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// reference implementation
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uint16_t Soundex::soundex16(const char * str)
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{
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uint8_t tmp = _length;
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_length = 5;
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char *p = soundex(str);
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_length = tmp;
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uint16_t value = (p[0] - 'A');
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for (uint8_t i = 1; i < 5; i++)
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{
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value *= 7;
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value += (p[i] - '0');
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}
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return value;
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}
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// reference implementation
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uint32_t Soundex::soundex32(const char * str)
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{
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uint8_t tmp = _length;
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_length = 10;
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char *p = soundex(str);
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_length = tmp;
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uint32_t value = (p[0] - 'A');
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for (uint8_t i = 1; i < 10; i++)
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{
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value *= 7;
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value += (p[i] - '0');
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}
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return value;
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}
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2022-02-06 10:08:32 -05:00
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// -- END OF FILE --
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