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https://github.com/jart/cosmopolitan.git
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77 lines
3.3 KiB
C
77 lines
3.3 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 2021 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/fmt/leb128.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/kmalloc.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/crc32.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/x/x.h"
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#include "third_party/zlib/zlib.h"
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/**
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* Loads δzd encoded data once atomically.
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*
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* @param a points to your static pointer holder
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* @param p is read-only data compressed using raw deflate
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* @param n is byte length of deflated data
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* @param m is byte length of inflated data
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* @param c is number of items in array
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* @param z is byte length of items
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* @param s is crc32 checksum
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* @return pointer to decoded data
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* @threadsafe
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*/
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void *xloadzd(_Atomic(void *) *a, const void *p, size_t n, size_t m, size_t c,
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size_t z, uint32_t s) {
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size_t i;
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char *q, *b;
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void *r, *g;
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int64_t x, y;
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if ((r = atomic_load_explicit(a, memory_order_acquire))) return r;
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_unassert(z == 2 || z == 4);
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if (!(b = q = malloc(m))) return 0;
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if (__inflate(q, m, p, n)) {
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free(q);
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return 0;
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}
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if (!(r = kmalloc(c * z))) {
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free(q);
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return 0;
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}
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for (x = i = 0; i < c; ++i) {
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b += unzleb64(b, 10, &y);
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x += y;
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if (z == 2) {
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((uint16_t *)r)[i] = x;
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} else {
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((uint32_t *)r)[i] = x;
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}
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}
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free(q);
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assert(crc32_z(0, r, c * z) == s);
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g = 0;
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if (!atomic_compare_exchange_strong_explicit(a, &g, r, memory_order_relaxed,
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memory_order_relaxed)) {
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r = g;
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}
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return r;
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}
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