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Rewrite ZipOS

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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.
This commit is contained in:
Justine Tunney 2023-10-03 07:27:25 -07:00
parent ff77f2a6af
commit b01282e23e
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GPG key ID: BE714B4575D6E328
21 changed files with 408 additions and 421 deletions
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12
libc/runtime/zipos-stat-impl.c
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@ -25,8 +25,7 @@
#include "libc/sysv/consts/s.h"
#include "libc/zip.internal.h"
int __zipos_stat_impl(struct Zipos *zipos, size_t cf, struct stat *st) {
size_t lf;
int __zipos_stat_impl(struct Zipos *zipos, int cf, struct stat *st) {
bzero(st, sizeof(*st));
st->st_nlink = 1;
st->st_dev = zipos->dev;
@ -35,12 +34,11 @@ int __zipos_stat_impl(struct Zipos *zipos, size_t cf, struct stat *st) {
st->st_mode = S_IFDIR | (0555 & ~atomic_load_explicit(
&__umask, memory_order_acquire));
} else {
lf = GetZipCfileOffset(zipos->map + cf);
st->st_mode = GetZipCfileMode(zipos->map + cf);
st->st_size = GetZipLfileUncompressedSize(zipos->map + lf);
st->st_mode = GetZipCfileMode(zipos->cdir + cf);
st->st_size = GetZipCfileUncompressedSize(zipos->cdir + cf);
st->st_blocks =
roundup(GetZipLfileCompressedSize(zipos->map + lf), 512) / 512;
GetZipCfileTimestamps(zipos->map + cf, &st->st_mtim, &st->st_atim,
roundup(GetZipCfileCompressedSize(zipos->cdir + cf), 512) / 512;
GetZipCfileTimestamps(zipos->cdir + cf, &st->st_mtim, &st->st_atim,
&st->st_ctim, 0);
st->st_birthtim = st->st_ctim;
}