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97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
// Copyright 2011 Shinichiro Hamaji. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY Shinichiro Hamaji ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Shinichiro Hamaji OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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#include "fat.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void fixEndian(uint32_t* p, bool be) {
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if (!be) {
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return;
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}
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uint32_t v = *p;
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*p = (v << 24) | ((v << 8) & 0x00ff0000) | ((v >> 8) & 0xff00) | (v >> 24);
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}
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static string getArchName(uint32_t a) {
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switch (a) {
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case CPU_TYPE_X86:
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return "x86";
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case CPU_TYPE_X86_64:
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return "x86-64";
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case CPU_TYPE_POWERPC:
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return "ppc";
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case CPU_TYPE_POWERPC64:
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return "ppc64";
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default:
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char buf[99];
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sprintf(buf, "??? (%u)", a);
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return buf;
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}
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}
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bool readFatInfo(int fd, map<string, fat_arch>* fat) {
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lseek(fd, 0, SEEK_SET);
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fat_header header;
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ssize_t len = read(fd, &header, sizeof(header));
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if (len < 0) {
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perror("read");
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exit(1);
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}
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if (len != sizeof(header)) {
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return false;
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}
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bool be = false;
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if (header.magic == FAT_CIGAM) {
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be = true;
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} else if (header.magic != FAT_MAGIC) {
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return false;
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}
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fixEndian(&header.nfat_arch, be);
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for (uint32_t i = 0; i < header.nfat_arch; i++) {
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fat_arch arch;
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len = read(fd, &arch, sizeof(arch));
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fixEndian(&arch.cputype, be);
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fixEndian(&arch.cpusubtype, be);
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fixEndian(&arch.offset, be);
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fixEndian(&arch.size, be);
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fixEndian(&arch.align, be);
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const string& name = getArchName(arch.cputype);
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fat->insert(make_pair(name, arch));
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}
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return true;
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}
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