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Work towards zipos / open(argv[0]) on metal (#667)

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tkchia 2022-11-06 15:29:47 +08:00 • committed by GitHub
parent 543c93f623
commit cb9a0466f1
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17 changed files with 257 additions and 46 deletions
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10
libc/str/getzipcdir.c
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@ -41,6 +41,7 @@ void *GetZipCdir(const uint8_t *p, size_t n) {
size_t i, j;
v8hi pk = {READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK"),
READ16LE("PK"), READ16LE("PK"), READ16LE("PK"), READ16LE("PK")};
uint32_t magic;
i = n - 4;
asm("" : "+x"(pk));
do {
@ -54,11 +55,14 @@ void *GetZipCdir(const uint8_t *p, size_t n) {
continue;
}
}
if (READ32LE(p + i) == kZipCdir64LocatorMagic &&
while (magic = READ32LE(p + i),
magic != kZipCdir64LocatorMagic && magic != kZipCdirHdrMagic &&
i + 0x10000 + 0x1000 >= n) --i;
if (magic == kZipCdir64LocatorMagic &&
i + kZipCdir64LocatorSize <= n &&
IsZipCdir64(p, n, ZIP_LOCATE64_OFFSET(p + i))) {
return p + ZIP_LOCATE64_OFFSET(p + i);
} else if (READ32LE(p + i) == kZipCdirHdrMagic && IsZipCdir32(p, n, i)) {
} else if (magic == kZipCdirHdrMagic && IsZipCdir32(p, n, i)) {
j = i;
do {
if (READ32LE(p + j) == kZipCdir64LocatorMagic &&
@ -69,6 +73,6 @@ void *GetZipCdir(const uint8_t *p, size_t n) {
} while (j-- && i - j < 128);
return p + i;
}
} while (i--);
} while (i-- + 0x10000 + 0x1000 >= n);
return 0;
}