mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
128 lines
4.8 KiB
C
128 lines
4.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/likely.h"
|
|
#include "libc/str/str.h"
|
|
|
|
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
|
|
|
|
static const char kUtf8Dispatch[] = {
|
|
0, 0, 1, 1, 1, 1, 1, 1, // 0300 utf8-2
|
|
1, 1, 1, 1, 1, 1, 1, 1, // 0310
|
|
1, 1, 1, 1, 1, 1, 1, 1, // 0320
|
|
1, 1, 1, 1, 1, 1, 1, 1, // 0330
|
|
2, 3, 3, 3, 3, 3, 3, 3, // 0340 utf8-3
|
|
3, 3, 3, 3, 3, 3, 3, 3, // 0350
|
|
4, 5, 5, 5, 5, 0, 0, 0, // 0360 utf8-4
|
|
0, 0, 0, 0, 0, 0, 0, 0, // 0370
|
|
};
|
|
|
|
/**
|
|
* Returns true if text is utf-8.
|
|
*
|
|
* _isutf8 n=0 1 nanoseconds
|
|
* _isutf8 n=5 661 ps/byte 1,476 mb/s
|
|
* _isutf8 ascii n=22851 26 ps/byte 35 GB/s
|
|
* _isutf8 unicode n=3193 543 ps/byte 1,795 mb/s
|
|
*
|
|
* This function considers all ASCII characters including NUL to be
|
|
* valid UTF-8. The conditions for something not being valid are:
|
|
*
|
|
* - Incorrect sequencing of 0300 (FIRST) and 0200 (CONT) chars
|
|
* - Thompson-Pike varint sequence not encodable as UTF-16
|
|
* - Overlong UTF-8 encoding
|
|
*
|
|
* @param size if -1 implies strlen
|
|
*/
|
|
dontasan bool _isutf8(const void *data, size_t size) {
|
|
long c;
|
|
unsigned m;
|
|
const char *p, *e;
|
|
if (size == -1) size = data ? strlen(data) : 0;
|
|
if (IsAsan()) __asan_verify(data, size);
|
|
p = data;
|
|
e = p + size;
|
|
while (p < e) {
|
|
#ifdef __x86_64__
|
|
if (!((intptr_t)p & 15)) {
|
|
for (;;) {
|
|
if ((m = __builtin_ia32_pmovmskb128(*(xmm_t *)p >= (xmm_t){0}) ^
|
|
0xffff)) {
|
|
m = __builtin_ctzll(m);
|
|
p += m;
|
|
break;
|
|
} else if ((p += 16) >= e) {
|
|
break;
|
|
}
|
|
}
|
|
if (p >= e) {
|
|
return true;
|
|
}
|
|
}
|
|
#endif
|
|
if (LIKELY((c = *p++ & 255) < 0200)) continue;
|
|
if (UNLIKELY(c < 0300)) return false;
|
|
switch (kUtf8Dispatch[c - 0300]) {
|
|
case 0:
|
|
return false;
|
|
case 1:
|
|
if (p < e && (*p & 0300) == 0200) {
|
|
++p;
|
|
break;
|
|
} else {
|
|
return false; // missing cont
|
|
}
|
|
case 2:
|
|
if (p < e && (*p & 0377) < 0240) {
|
|
return false; // overlong
|
|
}
|
|
// fallthrough
|
|
case 3:
|
|
if (p + 2 <= e && //
|
|
(p[0] & 0300) == 0200 && //
|
|
(p[1] & 0300) == 0200) { //
|
|
p += 2;
|
|
break;
|
|
} else {
|
|
return false; // missing cont
|
|
}
|
|
case 4:
|
|
if (p < e && (*p & 0377) < 0220) {
|
|
return false; // overlong
|
|
}
|
|
// fallthrough
|
|
case 5:
|
|
if (p + 3 <= e && //
|
|
(((uint32_t)(p[+2] & 0377) << 030 | //
|
|
(uint32_t)(p[+1] & 0377) << 020 | //
|
|
(uint32_t)(p[+0] & 0377) << 010 | //
|
|
(uint32_t)(p[-1] & 0377) << 000) & //
|
|
0xC0C0C000) == 0x80808000) { //
|
|
p += 3;
|
|
break;
|
|
} else {
|
|
return false; // missing cont
|
|
}
|
|
default:
|
|
__builtin_unreachable();
|
|
}
|
|
}
|
|
return true;
|
|
}
|