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https://github.com/jart/cosmopolitan.git
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b01282e23e
This reduces the virtual memory usage of Emacs for me by 30%. We now have a simpler implementation that uses read(), rather mmap()ing the whole executable.
41 lines
2.4 KiB
C
41 lines
2.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/limits.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/zip.internal.h"
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static uint64_t __zipos_fnv(const char *s, int len) {
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uint64_t hash = 0xcbf29ce484222325;
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for (int i = 0; i < len; i++) {
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hash *= 0x100000001b3;
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hash ^= (unsigned char)s[i];
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}
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return hash;
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}
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uint64_t __zipos_inode(struct Zipos *zipos, int64_t cfile, //
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const void *name, size_t namelen) {
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if (cfile == ZIPOS_SYNTHETIC_DIRECTORY) {
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if (namelen && ((char *)name)[namelen - 1] == '/') --namelen;
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cfile = INT64_MIN | __zipos_fnv(name, namelen);
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}
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return cfile;
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}
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