Created
April 18, 2018 02:43
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BrotliParseAsUTF8(14.90)
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static size_t BrotliParseAsUTF8( | |
int* symbol, const uint8_t* input, size_t size) { | |
/* ASCII */ | |
if ((input[0] & 0x80) == 0) { | |
*symbol = input[0]; | |
if (*symbol > 0) { | |
return 1; | |
} | |
} | |
/* 2-byte UTF8 */ | |
if (size > 1u && | |
(input[0] & 0xE0) == 0xC0 && | |
(input[1] & 0xC0) == 0x80) { | |
*symbol = (((input[0] & 0x1F) << 6) | | |
(input[1] & 0x3F)); | |
if (*symbol > 0x7F) { | |
return 2; | |
} | |
} | |
/* 3-byte UFT8 */ | |
if (size > 2u && | |
(input[0] & 0xF0) == 0xE0 && | |
(input[1] & 0xC0) == 0x80 && | |
(input[2] & 0xC0) == 0x80) { | |
*symbol = (((input[0] & 0x0F) << 12) | | |
((input[1] & 0x3F) << 6) | | |
(input[2] & 0x3F)); | |
if (*symbol > 0x7FF) { | |
return 3; | |
} | |
} | |
/* 4-byte UFT8 */ | |
if (size > 3u && | |
(input[0] & 0xF8) == 0xF0 && | |
(input[1] & 0xC0) == 0x80 && | |
(input[2] & 0xC0) == 0x80 && | |
(input[3] & 0xC0) == 0x80) { | |
*symbol = (((input[0] & 0x07) << 18) | | |
((input[1] & 0x3F) << 12) | | |
((input[2] & 0x3F) << 6) | | |
(input[3] & 0x3F)); | |
if (*symbol > 0xFFFF && *symbol <= 0x10FFFF) { | |
return 4; | |
} | |
} | |
/* Not UTF8, emit a special symbol above the UTF8-code space */ | |
*symbol = 0x110000 | input[0]; | |
return 1; | |
} |
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