commit 7f62d65: [Project] Add fast utf8 validation library
Vsevolod Stakhov
vsevolod at highsecure.ru
Fri Nov 15 18:56:07 UTC 2019
Author: Vsevolod Stakhov
Date: 2019-11-15 16:16:08 +0000
URL: https://github.com/rspamd/rspamd/commit/7f62d657cea4e50d65dc6be53cb091774b540da3
[Project] Add fast utf8 validation library
---
CMakeLists.txt | 1 +
contrib/fastutf8/CMakeLists.txt | 13 ++
{doc/doxydown => contrib/fastutf8}/LICENSE | 7 +-
contrib/fastutf8/avx2.c | 314 +++++++++++++++++++++++++++++
contrib/fastutf8/fastutf8.c | 158 +++++++++++++++
contrib/fastutf8/fastutf8.h | 59 ++++++
contrib/fastutf8/platform_config.h.in | 12 ++
contrib/fastutf8/sse41.c | 272 +++++++++++++++++++++++++
src/CMakeLists.txt | 1 +
src/libcryptobox/CMakeLists.txt | 8 +-
10 files changed, 838 insertions(+), 7 deletions(-)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51e0db3c2..692305875 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1294,6 +1294,7 @@ ADD_SUBDIRECTORY(contrib/lua-lpeg)
ADD_SUBDIRECTORY(contrib/t1ha)
ADD_SUBDIRECTORY(contrib/libev)
ADD_SUBDIRECTORY(contrib/kann)
+ADD_SUBDIRECTORY(contrib/fastutf8)
IF (NOT WITH_LUAJIT)
ADD_SUBDIRECTORY(contrib/lua-bit)
diff --git a/contrib/fastutf8/CMakeLists.txt b/contrib/fastutf8/CMakeLists.txt
new file mode 100644
index 000000000..f2570bc50
--- /dev/null
+++ b/contrib/fastutf8/CMakeLists.txt
@@ -0,0 +1,13 @@
+SET(UTFSRC ${CMAKE_CURRENT_SOURCE_DIR}/fastutf8.c)
+IF(HAVE_AVX2)
+ SET(UTFSRC ${UTFSRC} ${CMAKE_CURRENT_SOURCE_DIR}/avx2.c)
+ MESSAGE(STATUS "UTF8: AVX2 support is added")
+ENDIF()
+IF(HAVE_SSE41)
+ SET(UTFSRC ${UTFSRC} ${CMAKE_CURRENT_SOURCE_DIR}/sse41.c)
+ MESSAGE(STATUS "UTF8: SSE41 support is added")
+ENDIF()
+
+CONFIGURE_FILE(platform_config.h.in platform_config.h)
+
+ADD_LIBRARY(rspamd-fastutf8 STATIC ${UTFSRC})
\ No newline at end of file
diff --git a/doc/doxydown/LICENSE b/contrib/fastutf8/LICENSE
similarity index 92%
copy from doc/doxydown/LICENSE
copy to contrib/fastutf8/LICENSE
index d39277a3e..9b5471be2 100644
--- a/doc/doxydown/LICENSE
+++ b/contrib/fastutf8/LICENSE
@@ -1,6 +1,7 @@
-The MIT License (MIT)
+MIT License
-Copyright (c) 2014 Vsevolod Stakhov
+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
@@ -18,4 +19,4 @@ 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.
+SOFTWARE.
\ No newline at end of file
diff --git a/contrib/fastutf8/avx2.c b/contrib/fastutf8/avx2.c
new file mode 100644
index 000000000..765c62fdb
--- /dev/null
+++ b/contrib/fastutf8/avx2.c
@@ -0,0 +1,314 @@
+/*
+ * 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 "config.h"
+#include "fastutf8.h"
+#include "platform_config.h"
+
+
+#ifndef __clang__
+#pragma GCC push_options
+#pragma GCC target("avx2")
+#endif
+
+#ifndef __SSE2__
+#define __SSE2__
+#endif
+#ifndef __SSE__
+#define __SSE__
+#endif
+#ifndef __SSE4_2__
+#define __SSE4_2__
+#endif
+#ifndef __SSE4_1__
+#define __SSE4_1__
+#endif
+#ifndef __SSEE3__
+#define __SSEE3__
+#endif
+#ifndef __AVX__
+#define __AVX__
+#endif
+#ifndef __AVX2__
+#define __AVX2__
+#endif
+
+#include <immintrin.h>
+
+/*
+ * Map high nibble of "First Byte" to legal character length minus 1
+ * 0x00 ~ 0xBF --> 0
+ * 0xC0 ~ 0xDF --> 1
+ * 0xE0 ~ 0xEF --> 2
+ * 0xF0 ~ 0xFF --> 3
+ */
+static const int8_t _first_len_tbl[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3,
+};
+
+/* Map "First Byte" to 8-th item of range table (0xC2 ~ 0xF4) */
+static const int8_t _first_range_tbl[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,
+};
+
+/*
+ * Range table, map range index to min and max values
+ * Index 0 : 00 ~ 7F (First Byte, ascii)
+ * Index 1,2,3: 80 ~ BF (Second, Third, Fourth Byte)
+ * Index 4 : A0 ~ BF (Second Byte after E0)
+ * Index 5 : 80 ~ 9F (Second Byte after ED)
+ * Index 6 : 90 ~ BF (Second Byte after F0)
+ * Index 7 : 80 ~ 8F (Second Byte after F4)
+ * Index 8 : C2 ~ F4 (First Byte, non ascii)
+ * Index 9~15 : illegal: i >= 127 && i <= -128
+ */
+static const int8_t _range_min_tbl[] = {
+ 0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
+ 0xC2, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F,
+ 0x00, 0x80, 0x80, 0x80, 0xA0, 0x80, 0x90, 0x80,
+ 0xC2, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F,
+};
+static const int8_t _range_max_tbl[] = {
+ 0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
+ 0xF4, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+ 0x7F, 0xBF, 0xBF, 0xBF, 0xBF, 0x9F, 0xBF, 0x8F,
+ 0xF4, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+};
+
+/*
+ * Tables for fast handling of four special First Bytes(E0,ED,F0,F4), after
+ * which the Second Byte are not 80~BF. It contains "range index adjustment".
+ * +------------+---------------+------------------+----------------+
+ * | First Byte | original range| range adjustment | adjusted range |
+ * +------------+---------------+------------------+----------------+
+ * | E0 | 2 | 2 | 4 |
+ * +------------+---------------+------------------+----------------+
+ * | ED | 2 | 3 | 5 |
+ * +------------+---------------+------------------+----------------+
+ * | F0 | 3 | 3 | 6 |
+ * +------------+---------------+------------------+----------------+
+ * | F4 | 4 | 4 | 8 |
+ * +------------+---------------+------------------+----------------+
+ */
+/* index1 -> E0, index14 -> ED */
+static const int8_t _df_ee_tbl[] = {
+ 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0,
+ 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0,
+};
+/* index1 -> F0, index5 -> F4 */
+static const int8_t _ef_fe_tbl[] = {
+ 0, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 3, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static inline __m256i push_last_byte_of_a_to_b(__m256i a, __m256i b)
+ __attribute__((__target__("avx2")));
+static inline __m256i push_last_byte_of_a_to_b(__m256i a, __m256i b)
+{
+ return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 15);
+}
+
+static inline __m256i push_last_2bytes_of_a_to_b(__m256i a, __m256i b)
+ __attribute__((__target__("avx2")));
+static inline __m256i push_last_2bytes_of_a_to_b(__m256i a, __m256i b)
+{
+ return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 14);
+}
+
+static inline __m256i push_last_3bytes_of_a_to_b(__m256i a, __m256i b)
+ __attribute__((__target__("avx2")));
+static inline __m256i push_last_3bytes_of_a_to_b(__m256i a, __m256i b)
+{
+ return _mm256_alignr_epi8(b, _mm256_permute2x128_si256(a, b, 0x21), 13);
+}
+
+off_t rspamd_fast_utf8_validate_avx2 (const unsigned char *data, size_t len)
+ __attribute__((__target__("avx2")));
+
+/* 5x faster than naive method */
+/* Return 0 - success, -1 - error, >0 - first error char(if RET_ERR_IDX = 1) */
+off_t rspamd_fast_utf8_validate_avx2 (const unsigned char *data, size_t len)
+{
+ off_t err_pos = 1;
+
+ if (len >= 32) {
+ __m256i prev_input = _mm256_set1_epi8 (0);
+ __m256i prev_first_len = _mm256_set1_epi8 (0);
+
+ /* Cached tables */
+ const __m256i first_len_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _first_len_tbl);
+ const __m256i first_range_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _first_range_tbl);
+ const __m256i range_min_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _range_min_tbl);
+ const __m256i range_max_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _range_max_tbl);
+ const __m256i df_ee_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _df_ee_tbl);
+ const __m256i ef_fe_tbl =
+ _mm256_lddqu_si256 ((const __m256i *) _ef_fe_tbl);
+
+ __m256i error = _mm256_set1_epi8 (0);
+
+ while (len >= 32) {
+ const __m256i input = _mm256_lddqu_si256 ((const __m256i *) data);
+
+ /* high_nibbles = input >> 4 */
+ const __m256i high_nibbles =
+ _mm256_and_si256 (_mm256_srli_epi16 (input, 4), _mm256_set1_epi8 (0x0F));
+
+ /* first_len = legal character length minus 1 */
+ /* 0 for 00~7F, 1 for C0~DF, 2 for E0~EF, 3 for F0~FF */
+ /* first_len = first_len_tbl[high_nibbles] */
+ __m256i first_len = _mm256_shuffle_epi8 (first_len_tbl, high_nibbles);
+
+ /* First Byte: set range index to 8 for bytes within 0xC0 ~ 0xFF */
+ /* range = first_range_tbl[high_nibbles] */
+ __m256i range = _mm256_shuffle_epi8 (first_range_tbl, high_nibbles);
+
+ /* Second Byte: set range index to first_len */
+ /* 0 for 00~7F, 1 for C0~DF, 2 for E0~EF, 3 for F0~FF */
+ /* range |= (first_len, prev_first_len) << 1 byte */
+ range = _mm256_or_si256 (
+ range, push_last_byte_of_a_to_b (prev_first_len, first_len));
+
+ /* Third Byte: set range index to saturate_sub(first_len, 1) */
+ /* 0 for 00~7F, 0 for C0~DF, 1 for E0~EF, 2 for F0~FF */
+ __m256i tmp1, tmp2;
+
+ /* tmp1 = saturate_sub(first_len, 1) */
+ tmp1 = _mm256_subs_epu8 (first_len, _mm256_set1_epi8 (1));
+ /* tmp2 = saturate_sub(prev_first_len, 1) */
+ tmp2 = _mm256_subs_epu8 (prev_first_len, _mm256_set1_epi8 (1));
+
+ /* range |= (tmp1, tmp2) << 2 bytes */
+ range = _mm256_or_si256 (range, push_last_2bytes_of_a_to_b (tmp2, tmp1));
+
+ /* Fourth Byte: set range index to saturate_sub(first_len, 2) */
+ /* 0 for 00~7F, 0 for C0~DF, 0 for E0~EF, 1 for F0~FF */
+ /* tmp1 = saturate_sub(first_len, 2) */
+ tmp1 = _mm256_subs_epu8 (first_len, _mm256_set1_epi8 (2));
+ /* tmp2 = saturate_sub(prev_first_len, 2) */
+ tmp2 = _mm256_subs_epu8 (prev_first_len, _mm256_set1_epi8 (2));
+ /* range |= (tmp1, tmp2) << 3 bytes */
+ range = _mm256_or_si256 (range, push_last_3bytes_of_a_to_b (tmp2, tmp1));
+
+ /*
+ * Now we have below range indices caluclated
+ * Correct cases:
+ * - 8 for C0~FF
+ * - 3 for 1st byte after F0~FF
+ * - 2 for 1st byte after E0~EF or 2nd byte after F0~FF
+ * - 1 for 1st byte after C0~DF or 2nd byte after E0~EF or
+ * 3rd byte after F0~FF
+ * - 0 for others
+ * Error cases:
+ * 9,10,11 if non ascii First Byte overlaps
+ * E.g., F1 80 C2 90 --> 8 3 10 2, where 10 indicates error
+ */
+
+ /* Adjust Second Byte range for special First Bytes(E0,ED,F0,F4) */
+ /* Overlaps lead to index 9~15, which are illegal in range table */
+ __m256i shift1, pos, range2;
+ /* shift1 = (input, prev_input) << 1 byte */
+ shift1 = push_last_byte_of_a_to_b (prev_input, input);
+ pos = _mm256_sub_epi8 (shift1, _mm256_set1_epi8 (0xEF));
+ /*
+ * shift1: | EF F0 ... FE | FF 00 ... ... DE | DF E0 ... EE |
+ * pos: | 0 1 15 | 16 17 239| 240 241 255|
+ * pos-240: | 0 0 0 | 0 0 0 | 0 1 15 |
+ * pos+112: | 112 113 127| >= 128 | >= 128 |
+ */
+ tmp1 = _mm256_subs_epu8 (pos, _mm256_set1_epi8 ((char)240));
+ range2 = _mm256_shuffle_epi8 (df_ee_tbl, tmp1);
+ tmp2 = _mm256_adds_epu8 (pos, _mm256_set1_epi8 (112));
+ range2 = _mm256_add_epi8 (range2, _mm256_shuffle_epi8 (ef_fe_tbl, tmp2));
+
+ range = _mm256_add_epi8 (range, range2);
+
+ /* Load min and max values per calculated range index */
+ __m256i minv = _mm256_shuffle_epi8 (range_min_tbl, range);
+ __m256i maxv = _mm256_shuffle_epi8 (range_max_tbl, range);
+
+ /* Check value range */
+ error = _mm256_cmpgt_epi8(minv, input);
+ error = _mm256_or_si256(error, _mm256_cmpgt_epi8(input, maxv));
+ /* 5% performance drop from this conditional branch */
+ if (!_mm256_testz_si256(error, error)) {
+ break;
+ }
+
+ prev_input = input;
+ prev_first_len = first_len;
+
+ data += 32;
+ len -= 32;
+ err_pos += 32;
+ }
+
+ /* Error in first 16 bytes */
+ if (err_pos == 1) {
+ goto do_naive;
+ }
+
+ /* Find previous token (not 80~BF) */
+ int32_t token4 = _mm256_extract_epi32 (prev_input, 7);
+ const int8_t *token = (const int8_t *) &token4;
+ int lookahead = 0;
+
+ if (token[3] > (int8_t) 0xBF) {
+ lookahead = 1;
+ }
+ else if (token[2] > (int8_t) 0xBF) {
+ lookahead = 2;
+ }
+ else if (token[1] > (int8_t) 0xBF) {
+ lookahead = 3;
+ }
+
+ data -= lookahead;
+ len += lookahead;
+ err_pos -= lookahead;
+ }
+
+ /* Check remaining bytes with naive method */
+do_naive:
+ if (len > 0) {
+ off_t err_pos2 = rspamd_fast_utf8_validate_ref (data, len);
+
+ if (err_pos2) {
+ return err_pos + err_pos2 - 1;
+ }
+ }
+
+ return 0;
+}
+
+#ifndef __clang__
+#pragma GCC pop_options
+#endif
+
diff --git a/contrib/fastutf8/fastutf8.c b/contrib/fastutf8/fastutf8.c
new file mode 100644
index 000000000..4a8d3309b
--- /dev/null
+++ b/contrib/fastutf8/fastutf8.c
@@ -0,0 +1,158 @@
+/*
+ * 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 validate_func (data, len);
+}
\ No newline at end of file
diff --git a/contrib/fastutf8/fastutf8.h b/contrib/fastutf8/fastutf8.h
new file mode 100644
index 000000000..001499ab3
--- /dev/null
+++ b/contrib/fastutf8/fastutf8.h
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+
+#ifndef RSPAMD_FASTUTF8_H
+#define RSPAMD_FASTUTF8_H
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+enum rspamd_fast_utf8_cpu_flags {
+ RSPAMD_FAST_UTF8_FLAG_SSE41 = 1u << 0u,
+ RSPAMD_FAST_UTF8_FLAG_AVX2 = 1u << 1u,
+};
+
+/**
+ * Called to init codecs
+ * @param flags
+ */
+void rspamd_fast_utf8_library_init (unsigned flags);
+
+/**
+ * Called to validate input using fast codec
+ * @param data
+ * @param len
+ * @return
+ */
+off_t rspamd_fast_utf8_validate (const unsigned char *data, size_t len);
+
+/**
+ * Use plain C implementation
+ * @param data
+ * @param len
+ * @return
+ */
+off_t rspamd_fast_utf8_validate_ref (const unsigned char *data, size_t len);
+
+#endif
diff --git a/contrib/fastutf8/platform_config.h.in b/contrib/fastutf8/platform_config.h.in
new file mode 100644
index 000000000..301234e1e
--- /dev/null
+++ b/contrib/fastutf8/platform_config.h.in
@@ -0,0 +1,12 @@
+#ifndef PLATFORM_H_CONFIG
+#define PLATFORM_H_CONFIG
+
+#define ARCH "${ARCH}"
+#define CMAKE_ARCH_${ARCH} 1
+
+#ifdef __x86_64__
+#cmakedefine HAVE_AVX2 1
+#cmakedefine HAVE_SSE41 1
+#endif
+
+#endif
\ No newline at end of file
diff --git a/contrib/fastutf8/sse41.c b/contrib/fastutf8/sse41.c
new file mode 100644
index 000000000..df338cf27
--- /dev/null
+++ b/contrib/fastutf8/sse41.c
@@ -0,0 +1,272 @@
+/*
+ * 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 "config.h"
+#include "fastutf8.h"
+#include "platform_config.h"
+
+#ifndef __clang__
+#pragma GCC push_options
+#pragma GCC target("sse4.1")
+#endif
+
+#ifndef __SSE2__
+#define __SSE2__
+#endif
+#ifndef __SSE__
+#define __SSE__
+#endif
+#ifndef __SSEE3__
+#define __SSEE3__
+#endif
+#ifndef __SSE4_1__
+#define __SSE4_1__
+#endif
+
+#include <smmintrin.h>
+
+/*
+ * Map high nibble of "First Byte" to legal character length minus 1
*** OUTPUT TRUNCATED, 263 LINES SKIPPED ***
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