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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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4
libc/runtime/zipos-read.c
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@ -29,7 +29,7 @@ static ssize_t __zipos_read_impl(struct ZiposHandle *h, const struct iovec *iov,
int i;
int64_t b, x, y;
if (h->cfile == ZIPOS_SYNTHETIC_DIRECTORY ||
S_ISDIR(GetZipCfileMode(h->zipos->map + h->cfile))) {
S_ISDIR(GetZipCfileMode(h->zipos->cdir + h->cfile))) {
return eisdir();
}
if (opt_offset == -1) {
@ -39,7 +39,7 @@ static ssize_t __zipos_read_impl(struct ZiposHandle *h, const struct iovec *iov,
}
for (i = 0; i < iovlen && y < h->size; ++i, y += b) {
b = MIN(iov[i].iov_len, h->size - y);
if (b) memcpy(iov[i].iov_base, h->mem + y, b);
if (b) memcpy(iov[i].iov_base, h->data + y, b);
}
if (opt_offset == -1) {
h->pos = y;