mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-02 17:28:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Apply fixes and speedups

Browse source
This commit is contained in:
Justine Tunney 2021-10-04 03:23:31 -07:00
parent 7521bf9e73
commit 725f4d79f6
36 changed files with 682 additions and 334 deletions
Download patch file Download diff file Expand all files Collapse all files

19
libc/str/getzipcdir.c
View file

@ -16,8 +16,13 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/zip.h"
typedef char v16qi __attribute__((__vector_size__(16)));
typedef short v8hi __attribute__((__vector_size__(16)));
typedef long long v2di __attribute__((__vector_size__(16), __aligned__(1)));
/**
* Locates End Of Central Directory record in ZIP file.
*
@ -32,9 +37,23 @@
* @return pointer to EOCD64 or EOCD, or NULL if not found
*/
void *GetZipCdir(const uint8_t *p, size_t n) {
v2di x;
size_t i, j;
v8hi pk = {READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK"),
READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK")};
i = n - 4;
asm("" : "+x"(pk));
do {
if (i >= 14) {
x = *(const v2di *)(p + i - 14);
if (!(__builtin_ia32_pmovmskb128(
(v16qi)__builtin_ia32_pcmpeqw128((v8hi)x, pk)) |
__builtin_ia32_pmovmskb128((v16qi)__builtin_ia32_pcmpeqw128(
(v8hi)__builtin_ia32_psrldqi128(x, 8), pk)))) {
i -= 13;
continue;
}
}
if (READ32LE(p + i) == kZipCdir64LocatorMagic &&
i + kZipCdir64LocatorSize <= n &&
IsZipCdir64(p, n, ZIP_LOCATE64_OFFSET(p + i))) {