/* radare - LGPL - Copyright 2009-2023 - nibble, pancake, alvaro_fe */

#define R_BIN_MACH064 1
#include "bin_mach0.c"

#include "objc/mach064_classes.h"
#include "../format/mach0/mach064_is_kernelcache.c"

static bool check(RBinFile *bf, RBuffer *b) {
	ut8 buf[4] = {0};
	if (r_buf_size (b) > 4) {
		r_buf_read_at (b, 0, buf, sizeof (buf));
		if (!memcmp (buf, "\xfe\xed\xfa\xcf", 4)) {
			return true;
		}
		if (!memcmp (buf, "\xcf\xfa\xed\xfe", 4)) {
			return !is_kernelcache_buffer (b);
		}
	}
	return false;
}

static RBuffer* create(RBin* bin, const ut8 *code, int codelen, const ut8 *data, int datalen, RBinArchOptions *opt) {
	const bool use_pagezero = true;
	const bool use_main = true;
	const bool use_dylinker = true;
	const bool use_libsystem = true;
	const bool use_linkedit = true;
	ut64 filesize, codeva, datava;
	ut32 ncmds, magiclen, headerlen;
	ut64 p_codefsz = 0, p_codeva = 0, p_codesz = 0, p_codepa = 0;
	ut64 p_datafsz = 0, p_datava = 0, p_datasz = 0, p_datapa = 0;
	ut64 p_cmdsize = 0, p_entry = 0, p_tmp = 0;
	ut64 baddr = 0x100001000LL;
// TODO: baddr must be overriden with -b
	RBuffer *buf = r_buf_new ();

#define B(x,y) r_buf_append_bytes(buf,(const ut8*)(x),y)
#define D(x) r_buf_append_ut32(buf,x)
#define Q(x) r_buf_append_ut64(buf,x)
#define Z(x) r_buf_append_nbytes(buf,x)
#define W(x,y,z) r_buf_write_at(buf,x,(const ut8*)(y),z)
#define WZ(x,y) p_tmp=r_buf_size (buf);Z(x);W(p_tmp,y,strlen(y))

	/* MACH0 HEADER */
	// 32bit B ("\xce\xfa\xed\xfe", 4); // header
	B ("\xcf\xfa\xed\xfe", 4); // header
	D (7 | 0x01000000); // cpu type (x86) | ABI64
	//D (3); // subtype (i386-all)
	D(0x80000003); // x86-64 subtype
	D (2); // filetype (executable)

	ncmds = (data && datalen>0)? 3: 2;
	if (use_pagezero) {
		ncmds++;
	}
	if (use_dylinker) {
		ncmds++;
		if (use_linkedit) {
			ncmds += 3;
		}
		if (use_libsystem) {
			ncmds++;
		}
	}

	/* COMMANDS */
	D (ncmds); // ncmds
	p_cmdsize = r_buf_size (buf);
	D (-1); // headsize // cmdsize?
	D (0);//0x85); // flags
	D (0); // reserved -- only found in x86-64

	magiclen = r_buf_size (buf);

	if (use_pagezero) {
		/* PAGEZERO */
		D (0x19);   // cmd.LC_SEGMENT
		D (72); // sizeof (cmd)
		WZ (16, "__PAGEZERO");
		Q (0); // vmaddr
		Q (0x1000); // vmsize XXX
		Q (0); // fileoff
		Q (0); // filesize
		D (0); // maxprot
		D (0); // initprot
		D (0); // nsects
		D (0); // flags
	}

	/* TEXT SEGMENT */
	D (0x19);   // cmd.LC_SEGMENT_64
	//D (124+16+8); // sizeof (cmd)
	D (124+28); // sizeof (cmd)
	WZ (16, "__TEXT");
	Q (baddr); // vmaddr
	Q (0x1000); // vmsize XXX

	Q (0); // fileoff
	p_codefsz = r_buf_size (buf);
	Q (-1); // filesize
	D (7); // maxprot
	D (5); // initprot
	D (1); // nsects
	D (0); // flags
	// define section
	WZ (16, "__text");
	WZ (16, "__TEXT");
	p_codeva = r_buf_size (buf); // virtual address
	Q (-1);
	p_codesz = r_buf_size (buf); // size of code (end-start)
	Q (-1);
	p_codepa = r_buf_size (buf); // code - baddr
	D (-1); // offset, _start-0x1000);
	D (2); // align
	D (0); // reloff
	D (0); // nrelocs
	D (0); // flags
	D (0); // reserved1
	D (0); // reserved2
	D (0); // reserved3

	if (data && datalen > 0) {
		/* DATA SEGMENT */
		D (0x19);   // cmd.LC_SEGMENT_64
		D (124+28); // sizeof (cmd)
		p_tmp = r_buf_size (buf);
		Z (16);
		W (p_tmp, "__TEXT", 6); // segment name
		//XXX must be vmaddr+baddr
		Q (0x2000); // vmaddr
		//XXX must be vmaddr+baddr
		Q (0x1000); // vmsize
		Q (0); // fileoff
		p_datafsz = r_buf_size (buf);
		Q (-1); // filesize
		D (6); // maxprot
		D (6); // initprot
		D (1); // nsects
		D (0); // flags

		WZ (16, "__data");
		WZ (16, "__DATA");

		p_datava = r_buf_size (buf);
		Q (-1);
		p_datasz = r_buf_size (buf);
		Q (-1);
		p_datapa = r_buf_size (buf);
		D (-1); //_start-0x1000);
		D (2); // align
		D (0); // reloff
		D (0); // nrelocs
		D (0); // flags
		D (0); // reserved1
		D (0); // reserved2
		D (0); // reserved3
	}

	if (use_dylinker) {
		if (use_linkedit) {
			/* LINKEDIT */
			D (0x19); // cmd.LC_SEGMENT
			D (72); // sizeof (cmd)
			WZ (16, "__LINKEDIT");
			Q (0x3000); // vmaddr
			Q (0x00001000); // vmsize XXX
			Q (0x1000); // fileoff
			Q (0); // filesize
			D (7); // maxprot
			D (3); // initprot
			D (0); // nsects
			D (0); // flags

			/* LC_SYMTAB */
			D (2); // cmd.LC_SYMTAB
			D (24); // sizeof (cmd)
			D (0x1000); // symtab offset
			D (0); // symtab size
			D (0x1000); // strtab offset
			D (0); // strtab size

			/* LC_DYSYMTAB */
			D (0xb); // cmd.LC_DYSYMTAB
			D (80); // sizeof (cmd)
			Z (18 * sizeof (ut32)); // empty
		}

		const char *dyld = "/usr/lib/dyld";
		const int dyld_len = strlen (dyld) + 1;
		D(0xe); /* LC_DYLINKER */
		D((4 * 3) + dyld_len);
		D(dyld_len - 2);
		WZ(dyld_len, dyld); // path

		if (use_libsystem) {
			/* add libSystem at least ... */
			const char *lib = "/usr/lib/libSystem.B.dylib";
			const int lib_len = strlen (lib) + 1;
			D (0xc); /* LC_LOAD_DYLIB */
			D (24 + lib_len); // cmdsize
			D (24); // offset where the lib string start
			D (0x2);
			D (0x1);
			D (0x1);
			WZ (lib_len, lib);
		}
	}
	if (use_main) {
		/* LC_MAIN */
		D (0x80000028);   // cmd.LC_MAIN
		D (24); // sizeof (cmd)
		D (baddr); // entryoff
		D (0); // stacksize
		D (0); // ???
		D (0); // ???
	} else {
#define STATESIZE (21*sizeof (ut64))
		/* THREAD STATE */
		D (5); // LC_UNIXTHREAD
		D (184); // sizeof (cmd)
		D (4); // 1=i386, 4=x86_64
		D (42); // thread-state-count
		p_entry = r_buf_size (buf) + (16*sizeof (ut64));
		Z (STATESIZE);
	}

	WZ (4096 - r_buf_size (buf), "");
	headerlen = r_buf_size (buf) - magiclen;

	codeva = r_buf_size (buf) + baddr;
	datava = r_buf_size (buf) + codelen + baddr;

	if (p_entry != 0) {
		W (p_entry, &codeva, 8); // set PC
	}

	/* fill header variables */
	W (p_cmdsize, &headerlen, 4);
	filesize = magiclen + headerlen + codelen + datalen;
	// TEXT SEGMENT //
	W (p_codefsz, &filesize, 8);
	W (p_codefsz-16, &filesize, 8); // vmsize = filesize
	W (p_codeva, &codeva, 8);
	{
		ut64 clen = codelen;
		W (p_codesz, &clen, 8);
	}
	p_tmp = codeva - baddr;
	W (p_codepa, &p_tmp, 8);

	B (code, codelen);

	if (data && datalen>0) {
		/* append data */
		W (p_datafsz, &filesize, 8);
		W (p_datava, &datava, 8);
		W (p_datasz, &datalen, 8);
		p_tmp = datava - baddr;
		W (p_datapa, &p_tmp, 8);
		B (data, datalen);
	}

	return buf;
}

static RBinAddr* binsym(RBinFile *bf, int sym) {
	RBinAddr *ret = NULL;
	switch (sym) {
	case R_BIN_SYM_MAIN:
		{
			struct MACH0_(obj_t) *mo = R_UNWRAP3 (bf, bo, bin_obj);
			ut64 addr = MACH0_(get_main) (mo);
			if (addr != UT64_MAX && addr) {
				ret = R_NEW0 (RBinAddr);
				if (ret) {
					ret->paddr = ret->vaddr = addr;
				}
			}
		}
		break;
	}
	return ret;
}

RBinPlugin r_bin_plugin_mach064 = {
	.meta = {
		.name = "mach064",
		.desc = "mach064 bin plugin",
		.license = "LGPL3",
	},
	.get_sdb = &get_sdb,
	.load = &load,
	.destroy = &destroy,
	.check = &check,
	.baddr = &baddr,
	.binsym = binsym,
	.entries = &entries,
	.sections = &sections,
	.signature = &entitlements,
	.symbols_vec = &symbols_vec,
	.imports = &imports,
	.info = &info,
	.libs = &libs,
	.header = &MACH0_(mach_headerfields),
	.relocs = &relocs,
	.patch_relocs = &patch_relocs,
	.fields = &MACH0_(mach_fields),
	.create = &create,
	.classes = &classes,
	.write = &r_bin_write_mach0,
};

#ifndef R2_PLUGIN_INCORE
R_API RLibStruct radare_plugin = {
	.type = R_LIB_TYPE_BIN,
	.data = &r_bin_plugin_mach064,
	.version = R2_VERSION
};
#endif
