mirror of
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50 lines
2.7 KiB
C
50 lines
2.7 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/intrin/bits.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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#define TRIES 8
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/**
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* Returns offset of binary embedded inside binary.
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*
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* This can be used to load zip assets from an executable that hasn't
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* gone through the `objcopy -S -O binary` step. We make the assumption
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* that an x86_64-pc-linux-gnu toolchain is being used. This routine
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* would need to be changed to accommodate binaries built locally on
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* Apple, FreeBSD, etc.
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*
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* @param p needs to be page aligned
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* @param n is byte length of p
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* @return base address of image or NULL if not found
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*/
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uint8_t *FindEmbeddedApe(const uint8_t *p, size_t n) {
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size_t i;
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uint64_t w;
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n = MIN(n, TRIES * PAGESIZE);
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for (i = 0; i + 8 <= n; i += PAGESIZE) {
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w = READ64LE(p + i);
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if (w == READ64LE("MZqFpD='") || w == READ64LE("\177ELF\2\1\1\11")) {
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return (/*unconst*/ uint8_t *)(p + i);
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}
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}
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return 0;
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}
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