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