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/*
* MIT License
*
* Copyright (c) 2019 Yibo Cai
* Copyright (c) 2019 Vsevolod Stakhov
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "fastutf8.h"
#include "platform_config.h"
/*
* http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94
*
* Table 3-7. Well-Formed UTF-8 Byte Sequences
*
* +--------------------+------------+-------------+------------+-------------+
* | Code Points | First Byte | Second Byte | Third Byte | Fourth Byte |
* +--------------------+------------+-------------+------------+-------------+
* | U+0000..U+007F | 00..7F | | | |
* +--------------------+------------+-------------+------------+-------------+
* | U+0080..U+07FF | C2..DF | 80..BF | | |
* +--------------------+------------+-------------+------------+-------------+
* | U+0800..U+0FFF | E0 | A0..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+1000..U+CFFF | E1..EC | 80..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+D000..U+D7FF | ED | 80..9F | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+E000..U+FFFF | EE..EF | 80..BF | 80..BF | |
* +--------------------+------------+-------------+------------+-------------+
* | U+10000..U+3FFFF | F0 | 90..BF | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
* | U+40000..U+FFFFF | F1..F3 | 80..BF | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
* | U+100000..U+10FFFF | F4 | 80..8F | 80..BF | 80..BF |
* +--------------------+------------+-------------+------------+-------------+
*/
/* Return 0 - success, >0 - index (1 based) of first error char */
off_t
rspamd_fast_utf8_validate_ref (const unsigned char *data, size_t len)
{
off_t err_pos = 1;
while (len) {
int bytes;
const unsigned char byte1 = data[0];
/* 00..7F */
if (byte1 <= 0x7F) {
bytes = 1;
/* C2..DF, 80..BF */
}
else if (len >= 2 && byte1 >= 0xC2 && byte1 <= 0xDF &&
(signed char) data[1] <= (signed char) 0xBF) {
bytes = 2;
}
else if (len >= 3) {
const unsigned char byte2 = data[1];
/* Is byte2, byte3 between 0x80 ~ 0xBF */
const int byte2_ok = (signed char) byte2 <= (signed char) 0xBF;
const int byte3_ok = (signed char) data[2] <= (signed char) 0xBF;
if (byte2_ok && byte3_ok &&
/* E0, A0..BF, 80..BF */
((byte1 == 0xE0 && byte2 >= 0xA0) ||
/* E1..EC, 80..BF, 80..BF */
(byte1 >= 0xE1 && byte1 <= 0xEC) ||
/* ED, 80..9F, 80..BF */
(byte1 == 0xED && byte2 <= 0x9F) ||
/* EE..EF, 80..BF, 80..BF */
(byte1 >= 0xEE && byte1 <= 0xEF))) {
bytes = 3;
}
else if (len >= 4) {
/* Is byte4 between 0x80 ~ 0xBF */
const int byte4_ok = (signed char) data[3] <= (signed char) 0xBF;
if (byte2_ok && byte3_ok && byte4_ok &&
/* F0, 90..BF, 80..BF, 80..BF */
((byte1 == 0xF0 && byte2 >= 0x90) ||
/* F1..F3, 80..BF, 80..BF, 80..BF */
(byte1 >= 0xF1 && byte1 <= 0xF3) ||
/* F4, 80..8F, 80..BF, 80..BF */
(byte1 == 0xF4 && byte2 <= 0x8F))) {
bytes = 4;
}
else {
return err_pos;
}
}
else {
return err_pos;
}
}
else {
return err_pos;
}
len -= bytes;
err_pos += bytes;
data += bytes;
}
return 0;
}
/* Prototypes */
#ifdef HAVE_SSSE3
extern off_t rspamd_fast_utf8_validate_sse41 (const unsigned char *data, size_t len);
#endif
#ifdef HAVE_AVX2
extern off_t rspamd_fast_utf8_validate_avx2 (const unsigned char *data, size_t len);
#endif
static off_t (*validate_func) (const unsigned char *data, size_t len) =
rspamd_fast_utf8_validate_ref;
void
rspamd_fast_utf8_library_init (unsigned flags)
{
#ifdef HAVE_SSSE3
if (flags & RSPAMD_FAST_UTF8_FLAG_SSE41) {
validate_func = rspamd_fast_utf8_validate_sse41;
}
#endif
#ifdef HAVE_AVX2
if (flags & RSPAMD_FAST_UTF8_FLAG_AVX2) {
validate_func = rspamd_fast_utf8_validate_avx2;
}
#endif
}
off_t
rspamd_fast_utf8_validate (const unsigned char *data, size_t len)
{
return len >= 64 ?
validate_func (data, len) :
rspamd_fast_utf8_validate_ref (data, len);
}
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