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https://github.com/jart/cosmopolitan.git
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63 lines
3.2 KiB
C
63 lines
3.2 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 2022 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/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "third_party/puff/puff.h"
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#include "third_party/zlib/zlib.h"
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/**
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* Decompresses raw deflate data.
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*
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* This uses puff by default since it has a 2kb footprint. If zlib
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* proper is linked, then we favor that instead, since it's faster.
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*
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* @param outsize needs to be known ahead of time by some other means
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* @return 0 on success or nonzero on failure
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*/
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int __inflate(void *out, size_t outsize, const void *in, size_t insize) {
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int rc;
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z_stream zs;
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if (_weaken(inflateInit2) && _weaken(inflate) && _weaken(inflateEnd)) {
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zs.next_in = in;
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zs.avail_in = insize;
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zs.total_in = insize;
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zs.next_out = out;
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zs.avail_out = outsize;
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zs.total_out = outsize;
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zs.zalloc = Z_NULL;
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zs.zfree = Z_NULL;
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if ((rc = _weaken(inflateInit2)(&zs, -MAX_WBITS)) == Z_OK &&
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(rc = _weaken(inflate)(&zs, Z_FINISH)) == Z_STREAM_END &&
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(rc = _weaken(inflateEnd)(&zs)) == Z_OK) {
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rc = 0;
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} else if (rc == Z_OK) {
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rc = Z_STREAM_END; // coerce to nonzero
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} else {
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rc = rc;
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}
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} else {
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rc = _puff(out, &outsize, in, &insize);
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}
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STRACE("inflate([%#.*hhs%s], %'zu, %#.*hhs%s, %'zu) → %d", MIN(40, outsize),
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out, outsize > 40 ? "..." : "", outsize, MIN(40, insize), in,
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insize > 40 ? "..." : "", insize, rc);
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return rc;
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}
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