mirror of https://github.com/arendst/Tasmota.git
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
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#include "unicode.h"
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#include "esp_log.h"
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typedef struct {
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char mask; /* char data will be bitwise AND with this */
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char lead; /* start bytes of current char in utf-8 encoded character */
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uint32_t beg; /* beginning of codepoint range */
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uint32_t end; /* end of codepoint range */
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int bits_stored; /* the number of bits from the codepoint that fits in char */
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}utf_t;
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static utf_t * utf[] = {
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/* mask lead beg end bits */
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[0] = &(utf_t){0b00111111, 0b10000000, 0, 0, 6 },
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[1] = &(utf_t){0b01111111, 0b00000000, 0000, 0177, 7 },
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[2] = &(utf_t){0b00011111, 0b11000000, 0200, 03777, 5 },
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[3] = &(utf_t){0b00001111, 0b11100000, 04000, 0177777, 4 },
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[4] = &(utf_t){0b00000111, 0b11110000, 0200000, 04177777, 3 },
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&(utf_t){0},
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};
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int codepoint_len(const uint32_t cp)
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{
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int len = 0;
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for(utf_t **u = utf; *u; ++u) {
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if((cp >= (*u)->beg) && (cp <= (*u)->end)) {
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break;
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}
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++len;
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}
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if(len > 4) {
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ESP_LOGE("unicode", "invalid unicode cp %d!", cp);
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return 0;
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}
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return len;
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}
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void to_utf8(char chr[5], const uint32_t cp)
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{
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const int bytes = codepoint_len(cp);
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int shift = utf[0]->bits_stored * (bytes - 1);
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chr[0] = (cp >> shift & utf[bytes]->mask) | utf[bytes]->lead;
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shift -= utf[0]->bits_stored;
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for(int i = 1; i < bytes; ++i) {
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chr[i] = (cp >> shift & utf[0]->mask) | utf[0]->lead;
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shift -= utf[0]->bits_stored;
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}
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chr[bytes] = '\0';
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}
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int utf8_len(uint8_t ch)
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{
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int len = 0;
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for(utf_t **u = utf; *u; ++u) {
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if((ch & ~(*u)->mask) == (*u)->lead) {
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break;
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}
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++len;
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}
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if(len > 4) { /* Malformed leading byte */
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exit(1);
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}
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return len;
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}
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uint32_t to_cp(const char chr[4])
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{
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int bytes = utf8_len(*chr);
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int shift = utf[0]->bits_stored * (bytes - 1);
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uint32_t codep = (*chr++ & utf[bytes]->mask) << shift;
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for(int i = 1; i < bytes; ++i, ++chr) {
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shift -= utf[0]->bits_stored;
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codep |= ((char)*chr & utf[0]->mask) << shift;
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}
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return codep;
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}
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