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parsing.h
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/*
* Copyright 2021 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "native.h"
#include "utils.h"
#include <stdint.h>
/** String Quoting **/
#define MAX_ESCAPED_BYTES 8
typedef struct {
const long n;
const char s[MAX_ESCAPED_BYTES];
} quoted_t;
static const quoted_t _SingleQuoteTab[256] = {
['\x00'] = { .n = 6, .s = "\\u0000" },
['\x01'] = { .n = 6, .s = "\\u0001" },
['\x02'] = { .n = 6, .s = "\\u0002" },
['\x03'] = { .n = 6, .s = "\\u0003" },
['\x04'] = { .n = 6, .s = "\\u0004" },
['\x05'] = { .n = 6, .s = "\\u0005" },
['\x06'] = { .n = 6, .s = "\\u0006" },
['\x07'] = { .n = 6, .s = "\\u0007" },
['\b' ] = { .n = 6, .s = "\\u0008" },
['\t' ] = { .n = 2, .s = "\\t" },
['\n' ] = { .n = 2, .s = "\\n" },
['\x0b'] = { .n = 6, .s = "\\u000b" },
['\f' ] = { .n = 6, .s = "\\u000c" },
['\r' ] = { .n = 2, .s = "\\r" },
['\x0e'] = { .n = 6, .s = "\\u000e" },
['\x0f'] = { .n = 6, .s = "\\u000f" },
['\x10'] = { .n = 6, .s = "\\u0010" },
['\x11'] = { .n = 6, .s = "\\u0011" },
['\x12'] = { .n = 6, .s = "\\u0012" },
['\x13'] = { .n = 6, .s = "\\u0013" },
['\x14'] = { .n = 6, .s = "\\u0014" },
['\x15'] = { .n = 6, .s = "\\u0015" },
['\x16'] = { .n = 6, .s = "\\u0016" },
['\x17'] = { .n = 6, .s = "\\u0017" },
['\x18'] = { .n = 6, .s = "\\u0018" },
['\x19'] = { .n = 6, .s = "\\u0019" },
['\x1a'] = { .n = 6, .s = "\\u001a" },
['\x1b'] = { .n = 6, .s = "\\u001b" },
['\x1c'] = { .n = 6, .s = "\\u001c" },
['\x1d'] = { .n = 6, .s = "\\u001d" },
['\x1e'] = { .n = 6, .s = "\\u001e" },
['\x1f'] = { .n = 6, .s = "\\u001f" },
['"' ] = { .n = 2, .s = "\\\"" },
['\\' ] = { .n = 2, .s = "\\\\" },
};
static const quoted_t _DoubleQuoteTab[256] = {
['\x00'] = { .n = 7, .s = "\\\\u0000" },
['\x01'] = { .n = 7, .s = "\\\\u0001" },
['\x02'] = { .n = 7, .s = "\\\\u0002" },
['\x03'] = { .n = 7, .s = "\\\\u0003" },
['\x04'] = { .n = 7, .s = "\\\\u0004" },
['\x05'] = { .n = 7, .s = "\\\\u0005" },
['\x06'] = { .n = 7, .s = "\\\\u0006" },
['\x07'] = { .n = 7, .s = "\\\\u0007" },
['\b' ] = { .n = 7, .s = "\\\\u0008" },
['\t' ] = { .n = 3, .s = "\\\\t" },
['\n' ] = { .n = 3, .s = "\\\\n" },
['\x0b'] = { .n = 7, .s = "\\\\u000b" },
['\f' ] = { .n = 7, .s = "\\\\u000c" },
['\r' ] = { .n = 3, .s = "\\\\r" },
['\x0e'] = { .n = 7, .s = "\\\\u000e" },
['\x0f'] = { .n = 7, .s = "\\\\u000f" },
['\x10'] = { .n = 7, .s = "\\\\u0010" },
['\x11'] = { .n = 7, .s = "\\\\u0011" },
['\x12'] = { .n = 7, .s = "\\\\u0012" },
['\x13'] = { .n = 7, .s = "\\\\u0013" },
['\x14'] = { .n = 7, .s = "\\\\u0014" },
['\x15'] = { .n = 7, .s = "\\\\u0015" },
['\x16'] = { .n = 7, .s = "\\\\u0016" },
['\x17'] = { .n = 7, .s = "\\\\u0017" },
['\x18'] = { .n = 7, .s = "\\\\u0018" },
['\x19'] = { .n = 7, .s = "\\\\u0019" },
['\x1a'] = { .n = 7, .s = "\\\\u001a" },
['\x1b'] = { .n = 7, .s = "\\\\u001b" },
['\x1c'] = { .n = 7, .s = "\\\\u001c" },
['\x1d'] = { .n = 7, .s = "\\\\u001d" },
['\x1e'] = { .n = 7, .s = "\\\\u001e" },
['\x1f'] = { .n = 7, .s = "\\\\u001f" },
['"' ] = { .n = 4, .s = "\\\\\\\"" },
['\\' ] = { .n = 4, .s = "\\\\\\\\" },
};
static const quoted_t _HtmlQuoteTab[256] = {
['<'] = { .n = 6, .s = "\\u003c" },
['>'] = { .n = 6, .s = "\\u003e" },
['&'] = { .n = 6, .s = "\\u0026" },
// \u2028 and \u2029 is [E2 80 A8] and [E2 80 A9]
[0xe2] = { .n = 0, .s = {0} },
[0xa8] = { .n = 6, .s = "\\u2028" },
[0xa9] = { .n = 6, .s = "\\u2029" },
};
static always_inline __m128i _mm_find_quote(__m128i vv) {
__m128i e1 = _mm_cmpgt_epi8 (vv, _mm_set1_epi8(-1));
__m128i e2 = _mm_cmpgt_epi8 (vv, _mm_set1_epi8(31));
__m128i e3 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('"'));
__m128i e4 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('\\'));
__m128i r1 = _mm_andnot_si128 (e2, e1);
__m128i r2 = _mm_or_si128 (e3, e4);
__m128i rv = _mm_or_si128 (r1, r2);
return rv;
}
#if USE_AVX2
static always_inline __m256i _mm256_find_quote(__m256i vv) {
__m256i e1 = _mm256_cmpgt_epi8 (vv, _mm256_set1_epi8(-1));
__m256i e2 = _mm256_cmpgt_epi8 (vv, _mm256_set1_epi8(31));
__m256i e3 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('"'));
__m256i e4 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('\\'));
__m256i r1 = _mm256_andnot_si256 (e2, e1);
__m256i r2 = _mm256_or_si256 (e3, e4);
__m256i rv = _mm256_or_si256 (r1, r2);
return rv;
}
#endif
static always_inline ssize_t memcchr_quote(const char *sp, ssize_t nb, char *dp, ssize_t dn) {
uint32_t mm;
const char * ss = sp;
#if USE_AVX2
/* 32-byte loop, full store */
while (nb >= 32 && dn >= 32) {
__m256i vv = _mm256_loadu_si256 ((const void *)sp);
__m256i rv = _mm256_find_quote (vv);
_mm256_storeu_si256 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm256_movemask_epi8(rv)) != 0) {
return sp - ss + __builtin_ctz(mm);
}
/* move to next block */
sp += 32;
dp += 32;
nb -= 32;
dn -= 32;
}
/* 32-byte test, partial store */
if (nb >= 32) {
__m256i vv = _mm256_loadu_si256 ((const void *)sp);
__m256i rv = _mm256_find_quote (vv);
uint32_t mv = _mm256_movemask_epi8 (rv);
uint32_t fv = __builtin_ctzll ((uint64_t)mv | 0x0100000000);
/* copy at most `dn` characters */
if (fv <= dn) {
memcpy_p32(dp, sp, fv);
return sp - ss + fv;
} else {
memcpy_p32(dp, sp, dn);
return -(sp - ss + dn) - 1;
}
}
/* clear upper half to avoid AVX-SSE transition penalty */
_mm256_zeroupper();
#endif
/* 16-byte loop, full store */
while (nb >= 16 && dn >= 16) {
__m128i vv = _mm_loadu_si128 ((const void *)sp);
__m128i rv = _mm_find_quote (vv);
_mm_storeu_si128 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm_movemask_epi8(rv)) != 0) {
return sp - ss + __builtin_ctz(mm);
}
/* move to next block */
sp += 16;
dp += 16;
nb -= 16;
dn -= 16;
}
/* 16-byte test, partial store */
if (nb >= 16) {
__m128i vv = _mm_loadu_si128 ((const void *)sp);
__m128i rv = _mm_find_quote (vv);
uint32_t mv = _mm_movemask_epi8 (rv);
uint32_t fv = __builtin_ctz (mv | 0x010000);
/* copy at most `dn` characters */
if (fv <= dn) {
memcpy_p16(dp, sp, fv);
return sp - ss + fv;
} else {
memcpy_p16(dp, sp, dn);
return -(sp - ss + dn) - 1;
}
}
/* handle the remaining bytes with scalar code */
while (nb > 0 && dn > 0) {
if (_SingleQuoteTab[*(uint8_t *)sp].n) {
return sp - ss;
} else {
dn--, nb--;
*dp++ = *sp++;
}
}
/* check for dest buffer */
if (nb == 0) {
return sp - ss;
} else {
return -(sp - ss) - 1;
}
}
static const bool _EscTab[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x00-0x0F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0x10-0x1F
// '"'
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x20-0x2F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x30-0x3F
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x40-0x4F
// '""
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, // 0x50-0x5F
// 0x60-0xFF are zeroes
};
static always_inline uint8_t escape_mask4(const char *sp) {
return _EscTab[*(uint8_t *)(sp)] | (_EscTab[*(uint8_t *)(sp + 1)] << 1) | (_EscTab[*(uint8_t *)(sp + 2)] << 2) | (_EscTab[*(uint8_t *)(sp + 3)] << 3);
}
static always_inline ssize_t memcchr_quote_unsafe(const char *sp, ssize_t nb, char *dp, const quoted_t * tab) {
uint32_t mm;
const char * ds = dp;
size_t cn = 0;
simd_copy:
if (nb < 16) goto scalar_copy;
#if USE_AVX2
/* 32-byte loop, full store */
while (nb >= 32) {
__m256i vv = _mm256_loadu_si256 ((const void *)sp);
__m256i rv = _mm256_find_quote (vv);
_mm256_storeu_si256 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm256_movemask_epi8(rv)) != 0) {
cn = __builtin_ctz(mm);
sp += cn;
nb -= cn;
dp += cn;
goto escape;
}
/* move to next block */
sp += 32;
dp += 32;
nb -= 32;
}
/* clear upper half to avoid AVX-SSE transition penalty */
_mm256_zeroupper();
#endif
/* 16-byte loop, full store */
while (nb >= 16) {
__m128i vv = _mm_loadu_si128 ((const void *)sp);
__m128i rv = _mm_find_quote (vv);
_mm_storeu_si128 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm_movemask_epi8(rv)) != 0) {
cn = __builtin_ctz(mm);
sp += cn;
nb -= cn;
dp += cn;
goto escape;
}
/* move to next block */
sp += 16;
dp += 16;
nb -= 16;
}
/* handle the remaining bytes with scalar code */
// while (nb > 0) {
// if (_EscTab[*(uint8_t *)sp]) {
// goto escape;
// } else {
// nb--;
// *dp++ = *sp++;
// }
// }
// optimize: loop unrolling here
scalar_copy:
if (nb >= 8) {
uint8_t mask1 = escape_mask4(sp);
*(uint64_t *)dp = *(const uint64_t *)sp;
if (unlikely(mask1)) {
cn = __builtin_ctz(mask1);
sp += cn;
nb -= cn;
dp += cn;
goto escape;
}
uint8_t mask2 = escape_mask4(sp + 4);
if (unlikely(mask2)) {
cn = __builtin_ctz(mask2);
sp += cn + 4;
nb -= cn + 4;
dp += cn + 4;
goto escape;
}
dp += 8, sp += 8, nb -= 8;
}
if (nb >= 4) {
uint8_t mask2 = escape_mask4(sp);
*(uint32_t *)dp = *(const uint32_t *)sp;
if (unlikely(mask2)) {
cn = __builtin_ctz(mask2);
sp += cn;
nb -= cn;
dp += cn;
goto escape;
}
dp += 4, sp += 4, nb -= 4;
}
while (nb > 0) {
if (unlikely(_EscTab[*(uint8_t *)(sp)])) goto escape;
*dp++ = *sp++, nb--;
}
/* all quote done */
return dp - ds;
escape:
/* get the escape entry, handle consecutive quotes */
do {
uint8_t ch = *(uint8_t *)sp;
int nc = tab[ch].n;
/* copy the quoted value.
* Note: dp always has at least 8 bytes (MAX_ESCAPED_BYTES) here.
* so, we not use memcpy_p8(dp, tab[ch].s, nc);
*/
*(uint64_t *)dp = *(const uint64_t *)tab[ch].s;
sp++;
nb--;
dp += nc;
if (nb <= 0) break;
/* copy and find escape chars */
if (_EscTab[*(uint8_t *)(sp)] == 0) {
goto simd_copy;
}
} while (true);
return dp - ds;
}
/** String Unquoting **/
static const char _UnquoteTab[256] = {
['/' ] = '/',
['"' ] = '"',
['b' ] = '\b',
['f' ] = '\f',
['n' ] = '\n',
['r' ] = '\r',
['t' ] = '\t',
['u' ] = -1,
['\\'] = '\\',
};
static always_inline ssize_t memcchr_p32(const char *s, ssize_t nb, char *p) {
int64_t r;
ssize_t n = nb;
const char * q = s;
#if USE_AVX2
__m256i u;
__m256i v;
__m256i b = _mm256_set1_epi8('\\');
/* process every 32 bytes */
while (n >= 32) {
u = _mm256_loadu_si256 ((const void *)s);
v = _mm256_cmpeq_epi8 (u, b);
_mm256_storeu_si256 ((void *)p, u);
/* check for matches */
if ((r = _mm256_movemask_epi8(v)) != 0) {
return s - q + __builtin_ctzll(r);
}
/* move to the next 32 bytes */
s += 32;
p += 32;
n -= 32;
}
/* clear upper half to avoid AVX-SSE transition penalty */
_mm256_zeroupper();
#endif
/* initialze with '\\' */
__m128i x;
__m128i y;
__m128i a = _mm_set1_epi8('\\');
/* process every 16 bytes */
while (n >= 16) {
x = _mm_loadu_si128 ((const void *)s);
y = _mm_cmpeq_epi8 (x, a);
_mm_storeu_si128 ((void *)p, x);
/* check for matches */
if ((r = _mm_movemask_epi8(y)) != 0) {
return s - q + __builtin_ctzll(r);
}
/* move to the next 16 bytes */
s += 16;
p += 16;
n -= 16;
}
/* remaining bytes, do with scalar code */
while (n--) {
if (*s != '\\') {
*p++ = *s++;
} else {
return s - q;
}
}
/* nothing found, but everything was copied */
return -1;
}
#define ALL_01h (~0ul / 255)
#define ALL_7fh (ALL_01h * 127)
#define ALL_80h (ALL_01h * 128)
static always_inline uint32_t hasless(uint32_t x, uint8_t n) {
return (x - ALL_01h * n) & ~x & ALL_80h;
}
static always_inline uint32_t hasmore(uint32_t x, uint8_t n) {
return (x + ALL_01h * (127 - n) | x) & ALL_80h;
}
static always_inline uint32_t hasbetween(uint32_t x, uint8_t m, uint8_t n) {
return (ALL_01h * (127 + n) - (x & ALL_7fh) & ~x & (x & ALL_7fh) + ALL_01h * (127 - m)) & ALL_80h;
}
#undef ALL_01h
#undef ALL_7fh
#undef ALL_80h
static always_inline char ishex(char c) {
return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}
static always_inline void unirep(char **dp) {
*(*dp)++ = 0xef;
*(*dp)++ = 0xbf;
*(*dp)++ = 0xbd;
}
static always_inline char unhex16_is(const char *s) {
uint32_t v = *(uint32_t *)s;
return !(hasless(v, '0') || hasmore(v, 'f') || hasbetween(v, '9', 'A') || hasbetween(v, 'F', 'a'));
}
static always_inline uint32_t unhex16_fast(const char *s) {
uint32_t a = __builtin_bswap32(*(uint32_t *)s);
uint32_t b = 9 * ((~a & 0x10101010) >> 4) + (a & 0x0f0f0f0f);
uint32_t c = (b >> 4) | b;
uint32_t d = ((c >> 8) & 0xff00) | (c & 0x00ff);
return d;
}
static always_inline __m128i _mm_find_html(__m128i vv) {
__m128i e1 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('<'));
__m128i e2 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('>'));
__m128i e3 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('&'));
__m128i e4 = _mm_cmpeq_epi8 (vv, _mm_set1_epi8('\xe2'));
__m128i r1 = _mm_or_si128 (e1, e2);
__m128i r2 = _mm_or_si128 (e3, e4);
__m128i rv = _mm_or_si128 (r1, r2);
return rv;
}
#if USE_AVX2
static always_inline __m256i _mm256_find_html(__m256i vv) {
__m256i e1 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('<'));
__m256i e2 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('>'));
__m256i e3 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('&'));
__m256i e4 = _mm256_cmpeq_epi8 (vv, _mm256_set1_epi8('\xe2'));
__m256i r1 = _mm256_or_si256 (e1, e2);
__m256i r2 = _mm256_or_si256 (e3, e4);
__m256i rv = _mm256_or_si256 (r1, r2);
return rv;
}
#endif
static always_inline ssize_t memcchr_html_quote(const char *sp, ssize_t nb, char *dp, ssize_t dn) {
uint32_t mm;
const char * ss = sp;
#if USE_AVX2
/* 32-byte loop, full store */
while (nb >= 32 && dn >= 32) {
__m256i vv = _mm256_loadu_si256 ((const void *)sp);
__m256i rv = _mm256_find_html (vv);
_mm256_storeu_si256 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm256_movemask_epi8(rv)) != 0) {
return sp - ss + __builtin_ctz(mm);
}
/* move to next block */
sp += 32;
dp += 32;
nb -= 32;
dn -= 32;
}
/* 32-byte test, partial store */
if (nb >= 32) {
__m256i vv = _mm256_loadu_si256 ((const void *)sp);
__m256i rv = _mm256_find_html (vv);
uint32_t mv = _mm256_movemask_epi8 (rv);
uint32_t fv = __builtin_ctzll ((uint64_t)mv | 0x0100000000);
/* copy at most `dn` characters */
if (fv <= dn) {
memcpy_p32(dp, sp, fv);
return sp - ss + fv;
} else {
memcpy_p32(dp, sp, dn);
return -(sp - ss + dn) - 1;
}
}
/* clear upper half to avoid AVX-SSE transition penalty */
_mm256_zeroupper();
#endif
/* 16-byte loop, full store */
while (nb >= 16 && dn >= 16) {
__m128i vv = _mm_loadu_si128 ((const void *)sp);
__m128i rv = _mm_find_html (vv);
_mm_storeu_si128 ((void *)dp, vv);
/* check for matches */
if ((mm = _mm_movemask_epi8(rv)) != 0) {
return sp - ss + __builtin_ctz(mm);
}
/* move to next block */
sp += 16;
dp += 16;
nb -= 16;
dn -= 16;
}
/* 16-byte test, partial store */
if (nb >= 16) {
__m128i vv = _mm_loadu_si128 ((const void *)sp);
__m128i rv = _mm_find_html (vv);
uint32_t mv = _mm_movemask_epi8 (rv);
uint32_t fv = __builtin_ctz (mv | 0x010000);
/* copy at most `dn` characters */
if (fv <= dn) {
memcpy_p16(dp, sp, fv);
return sp - ss + fv;
} else {
memcpy_p16(dp, sp, dn);
return -(sp - ss + dn) - 1;
}
}
/* handle the remaining bytes with scalar code */
while (nb > 0 && dn > 0) {
if (*sp == '<' || *sp == '>' || *sp == '&' || *sp == '\xe2') {
return sp - ss;
} else {
dn--, nb--;
*dp++ = *sp++;
}
}
/* check for dest buffer */
if (nb == 0) {
return sp - ss;
} else {
return -(sp - ss) - 1;
}
}
static always_inline long unescape(const char** src, const char* end, char* dp) {
const char* sp = *src;
long nb = end - sp;
char cc = 0;
uint32_t r0, r1;
if (nb <= 0) return -ERR_EOF;
if ((cc = _UnquoteTab[(uint8_t)sp[1]]) == 0) {
*src += 1;
return -ERR_ESCAPE;
}
if (cc != -1) {
*dp = cc;
*src += 2;
return 1;
}
if (nb < 4) {
*src += 1;
return -ERR_EOF;
}
/* check for hexadecimal characters */
if (!unhex16_is(sp + 2)) {
*src += 2;
return -ERR_INVAL;
}
/* decode the code-point */
r0 = unhex16_fast(sp + 2);
sp += 6;
*src = sp;
/* ASCII characters, unlikely */
if (unlikely(r0 <= 0x7f)) {
*dp++ = (char)r0;
return 1;
}
/* latin-1 characters, unlikely */
if (unlikely(r0 <= 0x07ff)) {
*dp++ = (char)(0xc0 | (r0 >> 6));
*dp++ = (char)(0x80 | (r0 & 0x3f));
return 2;
}
/* 3-byte characters, likely */
if (likely(r0 < 0xd800 || r0 > 0xdfff)) {
*dp++ = (char)(0xe0 | ((r0 >> 12) ));
*dp++ = (char)(0x80 | ((r0 >> 6) & 0x3f));
*dp++ = (char)(0x80 | ((r0 ) & 0x3f));
return 3;
}
/* surrogate half, must follows by the other half */
if (nb < 6 || r0 > 0xdbff || sp[0] != '\\' || sp[1] != 'u') {
return -ERR_UNICODE;
}
/* check the hexadecimal escape */
if (!unhex16_is(sp + 2)) {
*src += 2;
return -ERR_INVAL;
}
/* decode the second code-point */
r1 = unhex16_fast(sp + 2);
/* it must be the other half */
if (r1 < 0xdc00 || r1 > 0xdfff) {
*src += 2;
return -ERR_UNICODE;
}
/* merge two surrogates */
r0 = (r0 - 0xd800) << 10;
r1 = (r1 - 0xdc00) + 0x010000;
r0 += r1;
/* encode the character */
*dp++ = (char)(0xf0 | ((r0 >> 18) ));
*dp++ = (char)(0x80 | ((r0 >> 12) & 0x3f));
*dp++ = (char)(0x80 | ((r0 >> 6) & 0x3f));
*dp++ = (char)(0x80 | ((r0 ) & 0x3f));
*src = sp + 6;
return 4;
}