diff options
Diffstat (limited to 'pugl/pugl_internal.h')
| -rw-r--r-- | pugl/pugl_internal.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/pugl/pugl_internal.h b/pugl/pugl_internal.h index 5b2b1c7..993f319 100644 --- a/pugl/pugl_internal.h +++ b/pugl/pugl_internal.h @@ -213,6 +213,40 @@ puglEnterContext(PuglView* view); void puglLeaveContext(PuglView* view, bool flush); +/** Return the code point for buf, or the replacement character on error. */ +static uint32_t +puglDecodeUTF8(const uint8_t* buf) +{ +#define FAIL_IF(cond) { if (cond) return 0xFFFD; } + + /* http://en.wikipedia.org/wiki/UTF-8 */ + + if (buf[0] < 0x80) { + return buf[0]; + } else if (buf[0] < 0xC2) { + return 0xFFFD; + } else if (buf[0] < 0xE0) { + FAIL_IF((buf[1] & 0xC0) != 0x80); + return (buf[0] << 6) + buf[1] - 0x3080; + } else if (buf[0] < 0xF0) { + FAIL_IF((buf[1] & 0xC0) != 0x80); + FAIL_IF(buf[0] == 0xE0 && buf[1] < 0xA0); + FAIL_IF((buf[2] & 0xC0) != 0x80); + return (buf[0] << 12) + (buf[1] << 6) + buf[2] - 0xE2080; + } else if (buf[0] < 0xF5) { + FAIL_IF((buf[1] & 0xC0) != 0x80); + FAIL_IF(buf[0] == 0xF0 && buf[1] < 0x90); + FAIL_IF(buf[0] == 0xF4 && buf[1] >= 0x90); + FAIL_IF((buf[2] & 0xC0) != 0x80); + FAIL_IF((buf[3] & 0xC0) != 0x80); + return ((buf[0] << 18) + + (buf[1] << 12) + + (buf[2] << 6) + + buf[3] - 0x3C82080); + } + return 0xFFFD; +} + static void puglDispatchEvent(PuglView* view, const PuglEvent* event) { |