The first code commit.

extract.cc

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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.
+
+// A command line tool to extract a Mach-O binary from a fat binary.
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <map>
+#include <string>
+
+#include "mach-o/fat.h"
+
+using namespace std;
+
+bool be = false;
+
+static void fixEndian(uint32_t* p) {
+  if (!be) {
+    return;
+  }
+
+  uint32_t v = *p;
+  *p = (v << 24) | ((v << 8) & 0x00ff0000) | ((v >> 8) & 0xff00) | (v >> 24);
+}
+
+static const char* 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:
+    return "???";
+  }
+}
+
+int main(int argc, char* argv[]) {
+  if (argc < 2) {
+    fprintf(stderr, "Usage: %s fat [arch out]\n", argv[0]);
+    exit(1);
+  }
+
+  int fd = open(argv[1], O_RDONLY);
+  if (fd < 0) {
+    perror("open");
+    exit(1);
+  }
+
+  off_t len = lseek(fd, 0, SEEK_END);
+  char* bin = reinterpret_cast<char*>(
+    mmap(NULL, len,
+         PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0));
+
+  fat_header* header = reinterpret_cast<fat_header*>(bin);
+
+  if (header->magic == FAT_CIGAM) {
+    be = true;
+  } else if (header->magic != FAT_MAGIC) {
+    fprintf(stderr, "Not fat\n");
+    exit(1);
+  }
+
+  fixEndian(&header->nfat_arch);
+
+  printf("magic=%x nfat_arch=%d\n",
+         header->magic, header->nfat_arch);
+
+  map<string, fat_arch*> archs;
+
+  char* fat_ptr = bin + sizeof(fat_header);
+  for (uint32_t i = 0; i < header->nfat_arch; i++) {
+    fat_arch* arch = reinterpret_cast<fat_arch*>(fat_ptr);
+
+    fixEndian(&arch->cputype);
+    fixEndian(&arch->cpusubtype);
+    fixEndian(&arch->offset);
+    fixEndian(&arch->size);
+    fixEndian(&arch->align);
+
+    const char* name = getArchName(arch->cputype);
+
+    printf("cputype=%d (%s) cpusubtype=%d offset=%d size=%d align=%d\n",
+           arch->cputype, name, arch->cpusubtype,
+           arch->offset, arch->size, arch->align);
+
+    archs.insert(make_pair(name, arch));
+
+    fat_ptr += sizeof(fat_arch);
+  }
+
+  for (int i = 2; i + 1 < argc; i += 2) {
+    const char* arch_name = argv[i];
+    map<string, fat_arch*>::const_iterator found = archs.find(arch_name);
+    if (found == archs.end()) {
+      printf("unknown arch: %s\n", arch_name);
+      continue;
+    }
+
+    fat_arch* arch = found->second;
+    FILE* fp = fopen(argv[i+1], "wb");
+    fwrite(bin + arch->offset, 1, arch->size, fp);
+    fclose(fp);
+  }
+}

include/_types.h

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+/*
+ * Copyright (c) 2004, 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef __TYPES_H_
+#define __TYPES_H_
+
+#include <stdint.h>
+//#include <sys/_types.h>
+
+#if __GNUC__ > 2 || __GNUC__ == 2 && __GNUC_MINOR__ >= 7
+#define __strfmonlike(fmtarg, firstvararg) \
+		__attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
+#define __strftimelike(fmtarg) \
+		__attribute__((__format__ (__strftime__, fmtarg, 0)))
+#else
+#define __strfmonlike(fmtarg, firstvararg)
+#define __strftimelike(fmtarg)
+#endif
+
+typedef	int		__darwin_nl_item;
+typedef	int		__darwin_wctrans_t;
+#ifdef __LP64__
+typedef	uint32_t	__darwin_wctype_t;
+#else /* !__LP64__ */
+typedef	unsigned long	__darwin_wctype_t;
+#endif /* __LP64__ */
+
+#ifdef __WCHAR_MAX__
+#define __DARWIN_WCHAR_MAX	__WCHAR_MAX__
+#else /* ! __WCHAR_MAX__ */
+#define __DARWIN_WCHAR_MAX	0x7fffffff
+#endif /* __WCHAR_MAX__ */
+
+#if __DARWIN_WCHAR_MAX > 0xffffU
+#define __DARWIN_WCHAR_MIN	(-0x7fffffff - 1)
+#else
+#define __DARWIN_WCHAR_MIN	0
+#endif
+#define	__DARWIN_WEOF 	((__darwin_wint_t)-1)
+
+#ifndef _FORTIFY_SOURCE
+#  if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && ((__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__-0) < 1050)
+#    define _FORTIFY_SOURCE 0
+#  else
+#    define _FORTIFY_SOURCE 2	/* on by default */
+#  endif
+#endif
+
+#endif /* __TYPES_H_ */

include/mac-ctype.h

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2000, 2005, 2008 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Paul Borman at Krystal Technologies.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS 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.
+ *
+ *	@(#)ctype.h	8.4 (Berkeley) 1/21/94
+ */
+
+#ifndef	MAC_CTYPE_H_
+#define MAC_CTYPE_H_
+
+#define _CTYPE_A        0x00000100L             /* Alpha */
+#define _CTYPE_C        0x00000200L             /* Control */
+#define _CTYPE_D        0x00000400L             /* Digit */
+#define _CTYPE_G        0x00000800L             /* Graph */
+#define _CTYPE_L        0x00001000L             /* Lower */
+#define _CTYPE_P        0x00002000L             /* Punct */
+#define _CTYPE_S        0x00004000L             /* Space */
+#define _CTYPE_U        0x00008000L             /* Upper */
+#define _CTYPE_X        0x00010000L             /* X digit */
+#define _CTYPE_B        0x00020000L             /* Blank */
+#define _CTYPE_R        0x00040000L             /* Print */
+#define _CTYPE_I        0x00080000L             /* Ideogram */
+#define _CTYPE_T        0x00100000L             /* Special */
+#define _CTYPE_Q        0x00200000L             /* Phonogram */
+
+/*
+ * Backward compatibility
+ */
+#define	_A		_CTYPE_A		/* Alpha */
+#define	_C		_CTYPE_C		/* Control */
+#define	_D		_CTYPE_D		/* Digit */
+#define	_G		_CTYPE_G		/* Graph */
+#define	_L		_CTYPE_L		/* Lower */
+#define	_P		_CTYPE_P		/* Punct */
+#define	_S		_CTYPE_S		/* Space */
+#define	_U		_CTYPE_U		/* Upper */
+#define	_X		_CTYPE_X		/* X digit */
+#define	_B		_CTYPE_B		/* Blank */
+#define	_R		_CTYPE_R		/* Print */
+#define	_I		_CTYPE_I		/* Ideogram */
+#define	_T		_CTYPE_T		/* Special */
+#define	_Q		_CTYPE_Q		/* Phonogram */
+
+#endif /* !MAC_CTYPE_H_ */

include/mach-o/fat.h

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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+#ifndef _MACH_O_FAT_H_
+#define _MACH_O_FAT_H_
+/*
+ * This header file describes the structures of the file format for "fat"
+ * architecture specific file (wrapper design).  At the begining of the file
+ * there is one fat_header structure followed by a number of fat_arch
+ * structures.  For each architecture in the file, specified by a pair of
+ * cputype and cpusubtype, the fat_header describes the file offset, file
+ * size and alignment in the file of the architecture specific member.
+ * The padded bytes in the file to place each member on it's specific alignment
+ * are defined to be read as zeros and can be left as "holes" if the file system
+ * can support them as long as they read as zeros.
+ *
+ * All structures defined here are always written and read to/from disk
+ * in big-endian order.
+ */
+
+/*
+ * <mach/machine.h> is needed here for the cpu_type_t and cpu_subtype_t types
+ * and contains the constants for the possible values of these types.
+ */
+#include <stdint.h>
+#include <mach/machine.h>
+//#include <architecture/byte_order.h>
+
+#define FAT_MAGIC	0xcafebabe
+#define FAT_CIGAM	0xbebafeca	/* NXSwapLong(FAT_MAGIC) */
+
+struct fat_header {
+	uint32_t	magic;		/* FAT_MAGIC */
+	uint32_t	nfat_arch;	/* number of structs that follow */
+};
+
+struct fat_arch {
+	cpu_type_t	cputype;	/* cpu specifier (int) */
+	cpu_subtype_t	cpusubtype;	/* machine specifier (int) */
+	uint32_t	offset;		/* file offset to this object file */
+	uint32_t	size;		/* size of this object file */
+	uint32_t	align;		/* alignment as a power of 2 */
+};
+
+#endif /* _MACH_O_FAT_H_ */