mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
247 lines
8 KiB
C
247 lines
8 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 2020 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/calls/blocksigs.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/cmpxchg.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/intrin/extend.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.h"
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#include "libc/zip.internal.h"
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static char *mapend;
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static size_t maptotal;
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static void *__zipos_mmap_space(size_t mapsize) {
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char *start;
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size_t offset;
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unassert(mapsize);
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offset = maptotal;
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maptotal += mapsize;
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start = (char *)kMemtrackZiposStart;
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if (!mapend) mapend = start;
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mapend = _extend(start, maptotal, mapend, MAP_PRIVATE,
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kMemtrackZiposStart + kMemtrackZiposSize);
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return start + offset;
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}
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void __zipos_free(struct ZiposHandle *h) {
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if (IsAsan()) {
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__asan_poison((char *)h + sizeof(struct ZiposHandle),
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h->mapsize - sizeof(struct ZiposHandle), kAsanHeapFree);
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}
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pthread_mutex_destroy(&h->lock);
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__zipos_lock();
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do h->next = h->zipos->freelist;
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while (!_cmpxchg(&h->zipos->freelist, h->next, h));
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__zipos_unlock();
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}
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static struct ZiposHandle *__zipos_alloc(struct Zipos *zipos, size_t size) {
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size_t mapsize;
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struct ZiposHandle *h, **ph;
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__zipos_lock();
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mapsize = sizeof(struct ZiposHandle) + size;
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mapsize = ROUNDUP(mapsize, 4096);
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StartOver:
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ph = &zipos->freelist;
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while ((h = *ph)) {
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if (h->mapsize >= mapsize) {
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if (!_cmpxchg(ph, h, h->next)) goto StartOver;
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h->next = 0;
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break;
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}
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ph = &h->next;
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}
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if (!h) {
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h = __zipos_mmap_space(mapsize);
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}
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__zipos_unlock();
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if (IsAsan()) {
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__asan_unpoison((char *)h, sizeof(struct ZiposHandle) + size);
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__asan_poison((char *)h + sizeof(struct ZiposHandle) + size,
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mapsize - (sizeof(struct ZiposHandle) + size),
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kAsanHeapOverrun);
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}
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if (h) {
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h->size = size;
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h->zipos = zipos;
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h->mapsize = mapsize;
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pthread_mutex_init(&h->lock, 0);
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}
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return h;
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}
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static int __zipos_mkfd(int minfd) {
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int fd, e = errno;
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if ((fd = __sys_fcntl(2, F_DUPFD_CLOEXEC, minfd)) != -1) {
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return fd;
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} else if (errno == EINVAL) {
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errno = e;
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return __fixupnewfd(__sys_fcntl(2, F_DUPFD, minfd), O_CLOEXEC);
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} else {
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return fd;
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}
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}
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static int __zipos_setfd(int fd, struct ZiposHandle *h, unsigned flags) {
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int want = fd;
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atomic_compare_exchange_strong_explicit(
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&g_fds.f, &want, fd + 1, memory_order_release, memory_order_relaxed);
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g_fds.p[fd].kind = kFdZip;
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g_fds.p[fd].handle = (intptr_t)h;
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g_fds.p[fd].flags = flags | O_CLOEXEC;
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g_fds.p[fd].extra = 0;
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__fds_unlock();
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return fd;
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}
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static int __zipos_load(struct Zipos *zipos, size_t cf, int flags,
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struct ZiposUri *name) {
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size_t lf;
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size_t size;
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int rc, fd, minfd;
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struct ZiposHandle *h;
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if (cf == ZIPOS_SYNTHETIC_DIRECTORY) {
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size = name->len;
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if (!(h = __zipos_alloc(zipos, size + 1))) return -1;
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if (size) memcpy(h->data, name->path, size);
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h->data[size] = 0;
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h->mem = h->data;
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} else {
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lf = GetZipCfileOffset(zipos->map + cf);
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npassert((ZIP_LFILE_MAGIC(zipos->map + lf) == kZipLfileHdrMagic));
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size = GetZipLfileUncompressedSize(zipos->map + lf);
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switch (ZIP_LFILE_COMPRESSIONMETHOD(zipos->map + lf)) {
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case kZipCompressionNone:
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if (!(h = __zipos_alloc(zipos, 0))) return -1;
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h->mem = ZIP_LFILE_CONTENT(zipos->map + lf);
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break;
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case kZipCompressionDeflate:
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if (!(h = __zipos_alloc(zipos, size))) return -1;
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if (!__inflate(h->data, size, ZIP_LFILE_CONTENT(zipos->map + lf),
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GetZipLfileCompressedSize(zipos->map + lf))) {
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h->mem = h->data;
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} else {
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h->mem = 0;
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eio();
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}
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break;
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default:
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return eio();
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}
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}
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h->pos = 0;
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h->cfile = cf;
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h->size = size;
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if (h->mem) {
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minfd = 3;
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__fds_lock();
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TryAgain:
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if (IsWindows() || IsMetal()) {
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if ((fd = __reservefd_unlocked(-1)) != -1) {
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return __zipos_setfd(fd, h, flags);
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}
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} else if ((fd = __zipos_mkfd(minfd)) != -1) {
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if (__ensurefds_unlocked(fd) != -1) {
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if (g_fds.p[fd].kind) {
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sys_close(fd);
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minfd = fd + 1;
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goto TryAgain;
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}
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return __zipos_setfd(fd, h, flags);
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}
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sys_close(fd);
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}
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__fds_unlock();
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}
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__zipos_free(h);
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return -1;
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}
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static int __zipos_open_impl(struct ZiposUri *name, int flags) {
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struct Zipos *zipos;
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if ((flags & O_CREAT) || //
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(flags & O_TRUNC) || //
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(flags & O_ACCMODE) != O_RDONLY) {
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return erofs();
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}
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if (!(zipos = __zipos_get())) {
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return enoexec();
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}
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ssize_t cf;
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if ((cf = __zipos_find(zipos, name)) == -1) {
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return -1;
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}
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if (flags & O_EXCL) {
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return eexist();
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}
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if (cf != ZIPOS_SYNTHETIC_DIRECTORY) {
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int mode = GetZipCfileMode(zipos->map + cf);
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if ((flags & O_DIRECTORY) && !S_ISDIR(mode)) {
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return enotdir();
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}
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if (!(mode & 0444)) {
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return eacces();
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}
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}
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return __zipos_load(zipos, cf, flags, name);
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}
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/**
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* Loads compressed file from αcτµαlly pδrταblε εxεcµταblε object store.
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*
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* @param uri is obtained via __zipos_parseuri()
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* @asyncsignalsafe
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* @threadsafe
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*/
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int __zipos_open(struct ZiposUri *name, int flags) {
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int rc;
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if (_weaken(pthread_testcancel_np) &&
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(rc = _weaken(pthread_testcancel_np)())) {
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errno = rc;
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return -1;
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}
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BLOCK_SIGNALS;
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rc = __zipos_open_impl(name, flags);
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ALLOW_SIGNALS;
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return rc;
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}
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