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Add function to add Unicode code point to buffer

This commit is contained in:
Wilson Lin 2018-08-03 22:57:30 +12:00
parent 1eb19a4bc6
commit 88017538f5
1 changed files with 35 additions and 0 deletions
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35
src/main/c/util/buffer.c
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@ -16,4 +16,39 @@ int hbu_buffer_compare_lit(hbu_buffer_t a, const char *b) {
return strcmp((char *) a->data, b);
}
// Logic copied from https://gist.github.com/MightyPork/52eda3e5677b4b03524e40c9f0ab1da5
int hbu_buffer_append_unicode(hbu_buffer_t buffer, uint32_t code_point) {
if (code_point <= 0x7F) {
// Plain ASCII
hbu_buffer_append(buffer, (hb_char_t) code_point);
return 1;
}
if (code_point <= 0x07FF) {
// 2-byte unicode
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 6) & 0x1F) | 0xC0));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 0) & 0x3F) | 0x80));
return 2;
}
if (code_point <= 0xFFFF) {
// 3-byte unicode
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 12) & 0x0F) | 0xE0));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 6) & 0x3F) | 0x80));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 0) & 0x3F) | 0x80));
return 3;
}
if (code_point <= 0x10FFFF) {
// 4-byte unicode
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 18) & 0x07) | 0xF0));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 12) & 0x3F) | 0x80));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 6) & 0x3F) | 0x80));
hbu_buffer_append(buffer, (hb_char_t) (((code_point >> 0) & 0x3F) | 0x80));
return 4;
}
return 0;
}
#endif