76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/* Freetype GL - A C OpenGL Freetype engine
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*
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* Distributed under the OSI-approved BSD 2-Clause License. See accompanying
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* file `LICENSE` for more details.
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*/
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#include "utf8-utils.h"
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#include <string.h>
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// ----------------------------------------------------- utf8_surrogate_len ---
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size_t utf8_surrogate_len(const char *character) {
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size_t result = 0;
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char test_char;
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if (!character) return 0;
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test_char = character[0];
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if ((test_char & 0x80) == 0) return 1;
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while (test_char & 0x80) {
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test_char <<= 1;
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result++;
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}
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return result;
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}
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// ------------------------------------------------------------ utf8_strlen ---
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size_t utf8_strlen(const char *string) {
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const char *ptr = string;
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size_t result = 0;
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while (*ptr) {
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ptr += utf8_surrogate_len(ptr);
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result++;
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}
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return result;
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}
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uint32_t utf8_to_utf32(const char *character) {
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uint32_t result = -1;
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if (!character) {
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return result;
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}
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if ((character[0] & 0x80) == 0x0) {
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result = character[0];
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}
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if ((character[0] & 0xC0) == 0xC0) {
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result = ((character[0] & 0x3F) << 6) | (character[1] & 0x3F);
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}
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if ((character[0] & 0xE0) == 0xE0) {
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result = ((character[0] & 0x1F) << (6 + 6)) |
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((character[1] & 0x3F) << 6) | (character[2] & 0x3F);
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}
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if ((character[0] & 0xF0) == 0xF0) {
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result = ((character[0] & 0x0F) << (6 + 6 + 6)) |
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((character[1] & 0x3F) << (6 + 6)) |
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((character[2] & 0x3F) << 6) | (character[3] & 0x3F);
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}
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if ((character[0] & 0xF8) == 0xF8) {
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result = ((character[0] & 0x07) << (6 + 6 + 6 + 6)) |
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((character[1] & 0x3F) << (6 + 6 + 6)) |
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((character[2] & 0x3F) << (6 + 6)) |
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((character[3] & 0x3F) << 6) | (character[4] & 0x3F);
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}
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return result;
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}
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