rizin/librz/main/rz-diff.c

// SPDX-FileCopyrightText: 2009-2020 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only

#include <rz_core.h>
#include <rz_main.h>

enum {
	MODE_DIFF,
	MODE_DIFF_STRS,
	MODE_DIFF_IMPORTS,
	MODE_DIST_MYERS,
	MODE_DIST_LEVENSHTEIN,
	MODE_CODE,
	MODE_GRAPH,
	MODE_COLS,
	MODE_COLSII
};

enum {
	GRAPH_DEFAULT_MODE,
	GRAPH_SDB_MODE,
	GRAPH_JSON_MODE,
	GRAPH_JSON_DIS_MODE,
	GRAPH_TINY_MODE,
	GRAPH_INTERACTIVE_MODE,
	GRAPH_DOT_MODE,
	GRAPH_STAR_MODE,
	GRAPH_GML_MODE
};

typedef struct {
	ut64 gdiff_start;
	bool zignatures;
	const char *file;
	const char *file2;
	ut32 count;
	int showcount;
	int useva;
	int delta;
	int showbare;
	int diffmode;
	int diffops;
	int mode;
	int gmode;
	bool disasm;
	bool pdc;
	bool quiet;
	RzCore *core;
	const char *arch;
	const char *runcmd;
	int bits;
	int analysis_all;
	int threshold;
	bool verbose;
	RzList *evals;
	PJ *pj;
} RzdiffOptions;

static RzCore *opencore(RzdiffOptions *ro, const char *f) {
	RzListIter *iter;
	const ut64 baddr = UT64_MAX;
	const char *e;
	RzCore *c = rz_core_new();
	if (!c) {
		return NULL;
	}
	rz_core_loadlibs(c, RZ_CORE_LOADLIBS_ALL, NULL);
	rz_config_set_i(c->config, "io.va", ro->useva);
	rz_config_set_i(c->config, "scr.interactive", false);
	rz_list_foreach (ro->evals, iter, e) {
		rz_config_eval(c->config, e, false);
	}
	if (f) {
		RzCoreFile *rfile = NULL;
#if __WINDOWS__
		char *winf = rz_acp_to_utf8(f);
		rfile = rz_core_file_open(c, winf, 0, 0);
		free(winf);
#else
		rfile = rz_core_file_open(c, f, 0, 0);
#endif

		if (!rfile) {
			rz_core_free(c);
			return NULL;
		}
		(void)rz_core_bin_load(c, NULL, baddr);
		(void)rz_core_bin_update_arch_bits(c);

		// force PA mode when working with raw bins
		if (rz_list_empty(rz_bin_get_sections(c->bin))) {
			rz_config_set_i(c->config, "io.va", false);
		}

		if (ro->analysis_all) {
			const char *cmd = "aac";
			switch (ro->analysis_all) {
			case 1: cmd = "aaa"; break;
			case 2: cmd = "aaaa"; break;
			}
			rz_core_cmd0(c, cmd);
		}
		if (ro->runcmd) {
			rz_core_cmd0(c, ro->runcmd);
		}
		// generate zignaturez?
		if (ro->zignatures) {
			rz_core_cmd0(c, "zg");
		}
		rz_cons_flush();
	}
	// TODO: must enable io.va here if wanted .. rz_config_set_i (c->config, "io.va", va);
	return c;
}

static void readstr(char *s, int sz, const ut8 *buf, int len) {
	*s = 0;
	int last = RZ_MIN(len, sz);
	if (last < 1) {
		return;
	}
	s[sz - 1] = 0;
	while (*s && *s == '\n') {
		s++;
	}
	strncpy(s, (char *)buf, last);
}

static int cb(RzDiff *d, void *user, RzDiffOp *op) {
	int i; // , diffmode = (int)(size_t)user;
	RzdiffOptions *ro = user;
	char s[256] = { 0 };
	if (ro->showcount) {
		ro->count++;
		return 1;
	}
	switch (ro->diffmode) {
	case 'U': // 'U' in theory never handled here
	case 'u':
		if (op->a_len > 0) {
			readstr(s, sizeof(s), op->a_buf, op->a_len);
			if (*s) {
				if (!ro->quiet) {
					printf(Color_RED);
				}
				printf("-0x%08" PFMT64x ":", op->a_off);
				int len = op->a_len; // RZ_MIN (op->a_len, strlen (op->a_buf));
				for (i = 0; i < len; i++) {
					printf("%02x ", op->a_buf[i]);
				}
				if (!ro->quiet) {
					char *p = rz_str_escape((const char *)op->a_buf);
					printf(" \"%s\"", p);
					free(p);
					printf(Color_RESET);
				}
				printf("\n");
			}
		}
		if (op->b_len > 0) {
			readstr(s, sizeof(s), op->b_buf, op->b_len);
			if (*s) {
				if (!ro->quiet) {
					printf(Color_GREEN);
				}
				printf("+0x%08" PFMT64x ":", op->b_off);
				for (i = 0; i < op->b_len; i++) {
					printf("%02x ", op->b_buf[i]);
				}
				if (!ro->quiet) {
					char *p = rz_str_escape((const char *)op->b_buf);
					printf(" \"%s\"", p);
					free(p);
					printf(Color_RESET);
				}
				printf("\n");
			}
		}
		break;
	case 'r':
		if (ro->disasm) {
			eprintf("rzcmds (-r) + disasm (-D) not yet implemented\n");
		}
		if (op->a_len == op->b_len) {
			printf("wx ");
			for (i = 0; i < op->b_len; i++) {
				printf("%02x", op->b_buf[i]);
			}
			printf(" @ 0x%08" PFMT64x "\n", op->b_off);
		} else {
			if (op->a_len > 0) {
				printf("r-%d @ 0x%08" PFMT64x "\n",
					op->a_len, op->a_off + ro->delta);
			}
			if (op->b_len > 0) {
				printf("r+%d @ 0x%08" PFMT64x "\n",
					op->b_len, op->b_off + ro->delta);
				printf("wx ");
				for (i = 0; i < op->b_len; i++) {
					printf("%02x", op->b_buf[i]);
				}
				printf(" @ 0x%08" PFMT64x "\n", op->b_off + ro->delta);
			}
			ro->delta += (op->b_off - op->a_off);
		}
		return 1;
	case 'j':
		if (ro->disasm) {
			eprintf("JSON (-j) + disasm (-D) not yet implemented\n");
		}
		{
			PJ *pj = ro->pj;
			pj_o(pj);
			pj_kn(pj, "addr", op->a_off);
			char *hex_from = rz_hex_bin2strdup(op->a_buf, op->a_len);
			pj_ks(pj, "from", hex_from);
			char *hex_to = rz_hex_bin2strdup(op->b_buf, op->b_len);
			pj_ks(pj, "to", hex_to);
			pj_end(pj);
		}
		return 1;
	case 0:
	default:
		if (ro->disasm) {
			int i;
			printf("--- 0x%08" PFMT64x "  ", op->a_off);
			if (!ro->core) {
				ro->core = opencore(ro, ro->file);
				if (ro->arch) {
					rz_config_set(ro->core->config, "asm.arch", ro->arch);
				}
				if (ro->bits) {
					rz_config_set_i(ro->core->config, "asm.bits", ro->bits);
				}
			}
			for (i = 0; i < op->a_len; i++) {
				printf("%02x", op->a_buf[i]);
			}
			printf("\n");
			if (ro->core) {
				int len = RZ_MAX(4, op->a_len);
				RzAsmCode *ac = rz_asm_mdisassemble(ro->core->rasm, op->a_buf, len);
				char *acbufasm = strdup(ac->assembly);
				if (ro->quiet) {
					char *bufasm = rz_str_prefix_all(acbufasm, "- ");
					printf("%s\n", bufasm);
					free(bufasm);
				} else {
					char *bufasm = rz_str_prefix_all(acbufasm, Color_RED "- ");
					printf("%s" Color_RESET, bufasm);
					free(bufasm);
				}
				free(acbufasm);
				rz_asm_code_free(ac);
			}
		} else {
			printf("0x%08" PFMT64x " ", op->a_off);
			for (i = 0; i < op->a_len; i++) {
				printf("%02x", op->a_buf[i]);
			}
		}
		if (ro->disasm) {
			int i;
			printf("+++ 0x%08" PFMT64x "  ", op->b_off);
			if (!ro->core) {
				ro->core = opencore(ro, NULL);
			}
			for (i = 0; i < op->b_len; i++) {
				printf("%02x", op->b_buf[i]);
			}
			printf("\n");
			if (ro->core) {
				int len = RZ_MAX(4, op->b_len);
				RzAsmCode *ac = rz_asm_mdisassemble(ro->core->rasm, op->b_buf, len);
				char *acbufasm = strdup(ac->assembly);
				if (ro->quiet) {
					char *bufasm = rz_str_prefix_all(acbufasm, "+ ");
					printf("%s\n", bufasm);
					free(bufasm);
					free(acbufasm);
				} else {
					char *bufasm = rz_str_prefix_all(acbufasm, Color_GREEN "+ ");
					printf("%s\n" Color_RESET, bufasm);
					free(bufasm);
					free(acbufasm);
				}
				// rz_asm_code_free (ac);
			}
		} else {
			printf(" => ");
			for (i = 0; i < op->b_len; i++) {
				printf("%02x", op->b_buf[i]);
			}
			printf(" 0x%08" PFMT64x "\n", op->b_off);
		}
		return 1;
	}
	return 0;
}

void print_bytes(const void *p, size_t len, bool big_endian) {
	size_t i;
	for (i = 0; i < len; i++) {
		ut8 ch = ((ut8 *)p)[big_endian ? (len - i - 1) : i];
		if (write(1, &ch, 1) != 1) {
			break;
		}
	}
}

static int bcb(RzDiff *d, void *user, RzDiffOp *op) {
	RzdiffOptions *ro = user;
	ut64 offset_diff = op->a_off - ro->gdiff_start;
	unsigned char opcode;
	unsigned short USAddr = 0;
	int IAddr = 0;
	unsigned char UCLen = 0;
	unsigned short USLen = 0;
	int ILen = 0;

	// we copy from gdiff_start to a_off
	if (offset_diff > 0) {

		// size for the position
		if (ro->gdiff_start <= USHRT_MAX) {
			opcode = 249;
			USAddr = (unsigned short)ro->gdiff_start;
		} else if (ro->gdiff_start <= INT_MAX) {
			opcode = 252;
			IAddr = (int)ro->gdiff_start;
		} else {
			opcode = 255;
		}

		// size for the length
		if (opcode != 255 && offset_diff <= UCHAR_MAX) {
			UCLen = (unsigned char)offset_diff;
		} else if (opcode != 255 && offset_diff <= USHRT_MAX) {
			USLen = (unsigned short)offset_diff;
			opcode += 1;
		} else if (opcode != 255 && offset_diff <= INT_MAX) {
			ILen = (int)offset_diff;
			opcode += 2;
		} else if (offset_diff > INT_MAX) {
			int times = offset_diff / INT_MAX;
			int max = INT_MAX;
			size_t i;
			for (i = 0; i < times; i++) {
				print_bytes(&opcode, sizeof(opcode), true);
				// XXX this is overflowingly wrong
				// XXX print_bytes (&gdiff_start + i * max, sizeof (gdiff_start), true);
				print_bytes(&max, sizeof(max), true);
			}
		}

		// print opcode for COPY
		print_bytes(&opcode, sizeof(opcode), true);

		// print position for COPY
		if (opcode <= 251) {
			print_bytes(&USAddr, sizeof(USAddr), true);
		} else if (opcode < 255) {
			print_bytes(&IAddr, sizeof(IAddr), true);
		} else {
			print_bytes(&ro->gdiff_start, sizeof(ro->gdiff_start), true);
		}

		// print length for COPY
		switch (opcode) {
		case 249:
		case 252:
			print_bytes(&UCLen, sizeof(UCLen), true);
			break;
		case 250:
		case 253:
			print_bytes(&USLen, sizeof(USLen), true);
			break;
		case 251:
		case 254:
		case 255:
			print_bytes(&ILen, sizeof(ILen), true);
			break;
		}
	}

	// we append data
	if (op->b_len <= 246) {
		ut8 data = op->b_len;
		rz_xwrite(1, &data, 1);
	} else if (op->b_len <= USHRT_MAX) {
		USLen = (ut16)op->b_len;
		ut8 data = 247;
		rz_xwrite(1, &data, 1);
		print_bytes(&USLen, sizeof(USLen), true);
	} else if (op->b_len <= INT_MAX) {
		ut8 data = 248;
		rz_xwrite(1, &data, 1);
		ILen = (int)op->b_len;
		print_bytes(&ILen, sizeof(ILen), true);
	} else {
		// split into multiple DATA, because op->b_len is greater than INT_MAX
		int times = op->b_len / INT_MAX;
		int max = INT_MAX;
		size_t i;
		for (i = 0; i < times; i++) {
			ut8 data = 248;
			if (write(1, &data, 1) != 1) {
				break;
			}
			print_bytes(&max, sizeof(max), true);
			print_bytes(op->b_buf, max, false);
			op->b_buf += max;
		}
		op->b_len = op->b_len % max;

		// print the remaining size
		int remain_size = op->b_len;
		print_bytes(&remain_size, sizeof(remain_size), true);
	}
	print_bytes(op->b_buf, op->b_len, false);
	ro->gdiff_start = op->b_off + op->b_len;
	return 0;
}

static int show_help(int v) {
	printf("Usage: rz-diff [-abBcCdeGhijnrOpqsSxuUvVzZ] [-A[A]] [-g sym] [-m graph_mode][-t %%] [file] [file]\n");
	if (v) {
		printf(
			"  -a [arch]  specify architecture plugin to use (x86, arm, ..)\n"
			"  -A [-A]    run aaa or aaaa after loading each binary (see -C)\n"
			"  -b [bits]  specify register size for arch (16 (thumb), 32, 64, ..)\n"
			"  -B         output in binary diff (GDIFF)\n"
			"  -c         count of changes\n"
			"  -C         graphdiff code (columns: off-A, match-ratio, off-B) (see -A)\n"
			"  -d         use delta diffing\n"
			"  -D         show disasm instead of hexpairs\n"
			"  -e [k=v]   set eval config var value for all RzCore instances\n"
			"  -g [sym|off1,off2]   graph diff of given symbol, or between two offsets\n"
			"  -G [cmd]   run an rz command on every RzCore instance created\n"
			"  -i         diff imports of target files (see -u, -U and -z)\n"
			"  -j         output in json format\n"
			"  -n         print bare addresses only (diff.bare=1)\n"
			"  -m [aditsjJ]  choose the graph output mode\n"
			"  -O         code diffing with opcode bytes only\n"
			"  -p         use physical addressing (io.va=0)\n"
			"  -q         quiet mode (disable colors, reduce output)\n"
			"  -r         output in rizin commands\n"
			"  -s         compute edit distance (no substitution, Eugene W. Myers' O(ND) diff algorithm)\n"
			"  -ss        compute Levenshtein edit distance (substitution is allowed, O(N^2))\n"
			"  -S [name]  sort code diff (name, namelen, addr, size, type, dist) (only for -C or -g)\n"
			"  -t [0-100] set threshold for code diff (default is 70%%)\n"
			"  -x         show two column hexdump diffing\n"
			"  -X         show two column hexII diffing\n"
			"  -u         unified output (---+++)\n"
			"  -U         unified output using system 'diff'\n"
			"  -v         show version information\n"
			"  -V         be verbose (current only for -s)\n"
			"  -z         diff on extracted strings\n"
			"  -Z         diff code comparing zignatures\n\n"
			"Graph Output formats: (-m [mode])\n"
			"  <blank/a>  Ascii art\n"
			"  s          rz commands\n"
			"  d          Graphviz dot\n"
			"  g          Graph Modelling Language (gml)\n"
			"  j          json\n"
			"  J          json with disarm\n"
			"  k          SDB key-value\n"
			"  t          Tiny ascii art\n"
			"  i          Interactive ascii art\n");
	}
	return 1;
}

#define DUMP_CONTEXT 2
static void dump_cols(ut8 *a, int as, ut8 *b, int bs, int w) {
	ut32 sz = RZ_MIN(as, bs);
	ut32 i, j;
	int ctx = DUMP_CONTEXT;
	int pad = 0;
	if (!a || !b || as < 0 || bs < 0) {
		return;
	}
	switch (w) {
	case 8:
		rz_cons_printf("  offset     0 1 2 3 4 5 6 7 01234567    0 1 2 3 4 5 6 7 01234567\n");
		break;
	case 16:
		rz_cons_printf("  offset     "
			       "0 1 2 3 4 5 6 7 8 9 A B C D E F 0123456789ABCDEF    "
			       "0 1 2 3 4 5 6 7 8 9 A B C D E F 0123456789ABCDEF\n");
		break;
	default:
		eprintf("Invalid column width\n");
		return;
	}
	rz_cons_break_push(NULL, NULL);
	for (i = 0; i < sz; i += w) {
		if (rz_cons_is_breaked()) {
			break;
		}
		if (i + w >= sz) {
			pad = w - sz + i;
			w = sz - i;
		}
		bool eq = !memcmp(a + i, b + i, w);
		if (eq) {
			ctx--;
			if (ctx == -1) {
				rz_cons_printf("...\n");
				continue;
			}
			if (ctx < 0) {
				ctx = -1;
				continue;
			}
		} else {
			ctx = DUMP_CONTEXT;
		}
		rz_cons_printf(eq ? Color_GREEN : Color_RED);
		rz_cons_printf("0x%08x%c ", i, eq ? ' ' : '!');
		rz_cons_printf(Color_RESET);
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			rz_cons_printf("%02x", a[i + j]);
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf("  ");
		}
		rz_cons_printf(" ");
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			rz_cons_printf("%c", IS_PRINTABLE(a[i + j]) ? a[i + j] : '.');
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf(" ");
		}
		rz_cons_printf("   ");
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			rz_cons_printf("%02x", b[i + j]);
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf("  ");
		}
		rz_cons_printf(" ");
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			rz_cons_printf("%c", IS_PRINTABLE(b[i + j]) ? b[i + j] : '.');
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		rz_cons_printf("\n");
		rz_cons_flush();
	}
	rz_cons_break_end();
	rz_cons_printf("\n" Color_RESET);
	rz_cons_flush();
	if (as != bs) {
		rz_cons_printf("...\n");
	}
}

static void dump_cols_hexii(ut8 *a, int as, ut8 *b, int bs, int w) {
	bool spacy = false;
	ut32 sz = RZ_MIN(as, bs);
	ut32 i, j;
	int ctx = DUMP_CONTEXT;
	int pad = 0;
	if (!a || !b || as < 0 || bs < 0) {
		return;
	}
	PrintfCallback p = rz_cons_printf;
	rz_cons_break_push(NULL, NULL);
	for (i = 0; i < sz; i += w) {
		if (rz_cons_is_breaked()) {
			break;
		}
		if (i + w >= sz) {
			pad = w - sz + i;
			w = sz - i;
		}
		bool eq = !memcmp(a + i, b + i, w);
		if (eq) {
			ctx--;
			if (ctx == -1) {
				rz_cons_printf("...\n");
				continue;
			}
			if (ctx < 0) {
				ctx = -1;
				continue;
			}
		} else {
			ctx = DUMP_CONTEXT;
		}
		rz_cons_printf(eq ? Color_GREEN : Color_RED);
		rz_cons_printf("0x%08x%c ", i, eq ? ' ' : '!');
		rz_cons_printf(Color_RESET);
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			ut8 ch = a[i + j];
			if (spacy) {
				p(" ");
			}
			if (ch == 0x00) {
				p("  ");
			} else if (ch == 0xff) {
				p("##");
			} else if (IS_PRINTABLE(ch)) {
				p(".%c", ch);
			} else {
				p("%02x", ch);
			}
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf("  ");
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf(" ");
		}
		rz_cons_printf("   ");
		for (j = 0; j < w; j++) {
			bool eq2 = a[i + j] == b[i + j];
			if (!eq) {
				rz_cons_printf(eq2 ? Color_GREEN : Color_RED);
			}
			ut8 ch = b[i + j];
			if (spacy) {
				p(" ");
			}
			if (ch == 0x00) {
				p("  ");
			} else if (ch == 0xff) {
				p("##");
			} else if (IS_PRINTABLE(ch)) {
				p(".%c", ch);
			} else {
				p("%02x", ch);
			}
			if (!eq) {
				rz_cons_printf(Color_RESET);
			}
		}
		for (j = 0; j < pad; j++) {
			rz_cons_printf("  ");
		}
		rz_cons_printf("\n");
		rz_cons_flush();
	}
	rz_cons_break_end();
	rz_cons_printf("\n" Color_RESET);
	rz_cons_flush();
	if (as != bs) {
		rz_cons_printf("...\n");
	}
}

static char *handle_sha256(const ut8 *block, int len) {
	int i = 0;
	char *p = malloc(128);
	RzHash *ctx = rz_hash_new(true, RZ_HASH_SHA256);
	const ut8 *c = rz_hash_do_sha256(ctx, block, len);
	if (!c) {
		rz_hash_free(ctx);
		free(p);
		return NULL;
	}
	char *r = p;
	for (i = 0; i < RZ_HASH_SIZE_SHA256; i++) {
		snprintf(r + (i * 2), 3, "%02x", c[i]);
	}
	rz_hash_free(ctx);
	return p;
}

static ut8 *slurp(RzdiffOptions *ro, RzCore **c, const char *file, size_t *sz) {
	RzIODesc *d;
	RzIO *io;
	if (c && file && strstr(file, "://")) {
		ut8 *data = NULL;
		ut64 size;
		if (!*c) {
			*c = opencore(ro, NULL);
		}
		if (!*c) {
			eprintf("opencore failed\n");
			return NULL;
		}
		io = (*c)->io;
		d = rz_io_open(io, file, 0, 0);
		if (!d) {
			return NULL;
		}
		size = rz_io_size(io);
		if (size > 0 && size < ST32_MAX) {
			data = calloc(1, size);
			if (rz_io_read_at(io, 0, data, size)) {
				if (sz) {
					*sz = size;
				}
			} else {
				eprintf("slurp: read error\n");
				RZ_FREE(data);
			}
		} else {
			eprintf("slurp: Invalid file size\n");
		}
		rz_io_desc_close(d);
		return data;
	}
	return (ut8 *)rz_file_slurp(file, sz);
}

static int import_cmp(const RzBinImport *a, const RzBinImport *b) {
	return strcmp(a->name, b->name);
}

static ut8 *get_imports(RzCore *c, int *len) {
	RzListIter *iter;
	RzBinImport *str, *old = NULL;
	ut8 *buf, *ptr;

	if (!c || !len) {
		return NULL;
	}

	RzList *list = rz_bin_get_imports(c->bin);
	rz_list_sort(list, (RzListComparator)import_cmp);

	*len = 0;

	rz_list_foreach (list, iter, str) {
		if (!old || (old && import_cmp(old, str) != 0)) {
			*len += strlen(str->name) + 1;
			old = str;
		}
	}
	ptr = buf = malloc(*len + 1);
	if (!ptr) {
		return NULL;
	}

	old = NULL;

	rz_list_foreach (list, iter, str) {
		if (old && !import_cmp(old, str)) {
			continue;
		}
		int namelen = strlen(str->name);
		memcpy(ptr, str->name, namelen);
		ptr += namelen;
		*ptr++ = '\n';
		old = str;
	}
	*ptr = 0;

	*len = strlen((const char *)buf);
	return buf;
}

static int bs_cmp(const RzBinString *a, const RzBinString *b) {
	int diff = a->length - b->length;
	return diff == 0 ? strncmp(a->string, b->string, a->length) : diff;
}

static ut8 *get_strings(RzCore *c, int *len) {
	RzList *list = rz_bin_get_strings(c->bin);
	RzListIter *iter;
	RzBinString *str, *old = NULL;
	ut8 *buf, *ptr;

	rz_list_sort(list, (RzListComparator)bs_cmp);

	*len = 0;

	rz_list_foreach (list, iter, str) {
		if (!old || (old && bs_cmp(old, str) != 0)) {
			*len += str->length + 1;
			old = str;
		}
	}

	ptr = buf = malloc(*len + 1);
	if (!ptr) {
		return NULL;
	}

	old = NULL;

	rz_list_foreach (list, iter, str) {
		if (old && bs_cmp(old, str) == 0) {
			continue;
		}
		memcpy(ptr, str->string, str->length);
		ptr += str->length;
		*ptr++ = '\n';
		old = str;
	}
	*ptr = 0;

	*len = strlen((const char *)buf);
	return buf;
}

static char *get_graph_commands(RzCore *c, ut64 off) {
	bool tmp_html = rz_cons_singleton()->is_html;
	rz_cons_singleton()->is_html = false;
	rz_cons_push();
	rz_core_analysis_graph(c, off, RZ_CORE_ANALYSIS_GRAPHBODY | RZ_CORE_ANALYSIS_GRAPHDIFF | RZ_CORE_ANALYSIS_STAR);
	const char *static_str = rz_cons_get_buffer();
	char *retstr = strdup(static_str ? static_str : "");
	rz_cons_pop();
	rz_cons_echo(NULL);
	rz_cons_singleton()->is_html = tmp_html;
	return retstr;
}

static void __generate_graph(RzCore *c, ut64 off) {
	rz_return_if_fail(c);
	char *ptr = get_graph_commands(c, off);
	char *str = ptr;
	rz_cons_break_push(NULL, NULL);
	if (str) {
		for (;;) {
			if (rz_cons_is_breaked()) {
				break;
			}
			char *eol = strchr(ptr, '\n');
			if (eol) {
				*eol = '\0';
			}
			if (*ptr) {
				char *p = strdup(ptr);
				if (!p) {
					free(str);
					return;
				}
				rz_core_cmd0(c, p);
				free(p);
			}
			if (!eol) {
				break;
			}
			ptr = eol + 1;
		}
		free(str);
	}
	rz_cons_break_pop();
}

static void __print_diff_graph(RzCore *c, ut64 off, int gmode) {
	int opts = RZ_CORE_ANALYSIS_GRAPHBODY | RZ_CORE_ANALYSIS_GRAPHDIFF;
	int use_utf8 = rz_config_get_i(c->config, "scr.utf8");
	rz_agraph_reset(c->graph);
	switch (gmode) {
	case GRAPH_DOT_MODE:
		rz_core_analysis_graph(c, off, opts);
		break;
	case GRAPH_STAR_MODE:
		rz_core_analysis_graph(c, off, opts | RZ_CORE_ANALYSIS_STAR);
		break;
	case GRAPH_TINY_MODE:
		__generate_graph(c, off);
		rz_core_agraph_print(c, use_utf8, "t");
		break;
	case GRAPH_INTERACTIVE_MODE:
		__generate_graph(c, off);
		rz_core_agraph_print(c, use_utf8, "v");
		rz_cons_reset_colors();
		break;
	case GRAPH_SDB_MODE:
		__generate_graph(c, off);
		rz_core_agraph_print(c, use_utf8, "k");
		break;
	case GRAPH_GML_MODE:
		__generate_graph(c, off);
		rz_core_agraph_print(c, use_utf8, "g");
		break;
	case GRAPH_JSON_MODE:
		rz_core_analysis_graph(c, off, opts | RZ_CORE_ANALYSIS_JSON);
		break;
	case GRAPH_JSON_DIS_MODE:
		rz_core_analysis_graph(c, off, opts | RZ_CORE_ANALYSIS_JSON | RZ_CORE_ANALYSIS_JSON_FORMAT_DISASM);
		break;
	case GRAPH_DEFAULT_MODE:
	default:
		__generate_graph(c, off);
		rz_core_agraph_print(c, use_utf8, "");
		rz_cons_reset_colors();
		break;
	}
}

static void rzdiff_options_init(RzdiffOptions *ro) {
	memset(ro, 0, sizeof(RzdiffOptions));
	ro->threshold = -1;
	ro->useva = true;
	ro->evals = rz_list_newf(NULL);
	ro->mode = MODE_DIFF;
	ro->gmode = GRAPH_DEFAULT_MODE;
}

static void rzdiff_options_fini(RzdiffOptions *ro) {
	rz_list_free(ro->evals);
	rz_core_free(ro->core);
	rz_cons_free();
}

static void fileobj(RzdiffOptions *ro, const char *ro_file, const ut8 *buf, size_t sz) {
	PJ *pj = ro->pj;
	pj_o(pj);
	pj_ks(pj, "filename", ro_file);
	pj_kn(pj, "size", sz);
	char *hasha = handle_sha256(buf, (int)sz);
	pj_ks(pj, "sha256", hasha);
	free(hasha);
	pj_end(pj);
}

RZ_API int rz_main_rz_diff(int argc, const char **argv) {
	RzdiffOptions ro;
	const char *columnSort = NULL;
	const char *addr = NULL;
	RzCore *c = NULL, *c2 = NULL;
	ut8 *bufa = NULL, *bufb = NULL;
	int o, /*diffmode = 0,*/ delta = 0;
	ut64 sza = 0, szb = 0;
	double sim = 0.0;
	RzDiff *d;
	RzGetopt opt;

	rz_subprocess_init();
	atexit(rz_subprocess_fini);

	rzdiff_options_init(&ro);
	rz_getopt_init(&opt, argc, argv, "Aa:b:BCDe:npg:m:G:OijrhcdsS:uUvVxXt:zqZ");
	while ((o = rz_getopt_next(&opt)) != -1) {
		switch (o) {
		case 'a':
			ro.arch = opt.arg;
			break;
		case 'A':
			ro.analysis_all++;
			break;
		case 'b':
			ro.bits = atoi(opt.arg);
			break;
		case 'B':
			ro.diffmode = 'B';
			break;
		case 'e':
			rz_list_append(ro.evals, (void *)opt.arg);
			break;
		case 'p':
			ro.useva = false;
			break;
		case 'r':
			ro.diffmode = 'r';
			break;
		case 'g':
			ro.mode = MODE_GRAPH;
			addr = opt.arg;
			break;
		case 'm': {
			const char *tmp = opt.arg;
			switch (tmp[0]) {
			case 'i': ro.gmode = GRAPH_INTERACTIVE_MODE; break;
			case 'k': ro.gmode = GRAPH_SDB_MODE; break;
			case 'j': ro.gmode = GRAPH_JSON_MODE; break;
			case 'J': ro.gmode = GRAPH_JSON_DIS_MODE; break;
			case 't': ro.gmode = GRAPH_TINY_MODE; break;
			case 'd': ro.gmode = GRAPH_DOT_MODE; break;
			case 's': ro.gmode = GRAPH_STAR_MODE; break;
			case 'g': ro.gmode = GRAPH_GML_MODE; break;
			case 'a':
			default: ro.gmode = GRAPH_DEFAULT_MODE; break;
			}
		} break;
		case 'G':
			ro.runcmd = opt.arg;
			break;
		case 'c':
			ro.showcount = 1;
			break;
		case 'C':
			ro.mode = MODE_CODE;
			break;
		case 'i':
			ro.mode = MODE_DIFF_IMPORTS;
			break;
		case 'n':
			ro.showbare = true;
			break;
		case 'O':
			ro.diffops = 1;
			break;
		case 't':
			ro.threshold = atoi(opt.arg);
			printf("%s\n", opt.arg);
			break;
		case 'd':
			delta = 1;
			break;
		case 'D':
			if (ro.disasm) {
				ro.pdc = true;
				ro.disasm = false;
				ro.mode = MODE_CODE;
			} else {
				ro.disasm = true;
			}
			break;
		case 'h':
			return show_help(1);
		case 's':
			if (ro.mode == MODE_DIST_MYERS) {
				ro.mode = MODE_DIST_LEVENSHTEIN;
			} else {
				ro.mode = MODE_DIST_MYERS;
			}
			break;
		case 'S':
			columnSort = opt.arg;
			break;
		case 'x':
			ro.mode = MODE_COLS;
			break;
		case 'X':
			ro.mode = MODE_COLSII;
			break;
		case 'u':
			ro.diffmode = 'u';
			break;
		case 'U':
			ro.diffmode = 'U';
			break;
		case 'v':
			return rz_main_version_print("rz-diff");
		case 'q':
			ro.quiet = true;
			break;
		case 'V':
			ro.verbose = true;
			break;
		case 'j':
			ro.diffmode = 'j';
			ro.pj = pj_new();
			break;
		case 'z':
			ro.mode = MODE_DIFF_STRS;
			break;
		case 'Z':
			ro.zignatures = true;
			break;
		default:
			return show_help(0);
		}
	}

	if (argc < 3 || opt.ind + 2 > argc) {
		return show_help(0);
	}
	ro.file = (opt.ind < argc) ? argv[opt.ind] : NULL;
	ro.file2 = (opt.ind + 1 < argc) ? argv[opt.ind + 1] : NULL;

	if (RZ_STR_ISEMPTY(ro.file) || RZ_STR_ISEMPTY(ro.file2)) {
		eprintf("Cannot open empty path\n");
		return 1;
	}

	switch (ro.mode) {
	case MODE_GRAPH:
	case MODE_CODE:
	case MODE_DIFF_STRS:
	case MODE_DIFF_IMPORTS:
		c = opencore(&ro, ro.file);
		if (!c) {
			eprintf("Cannot open '%s'\n", rz_str_get_null(ro.file));
		}
		c2 = opencore(&ro, ro.file2);
		if (!c2) {
			eprintf("Cannot open '%s'\n", rz_str_get_null(ro.file2));
		}
		if (!c || !c2) {
			return 1;
		}
		c->c2 = c2;
		c2->c2 = c;
		rz_core_parse_rizinrc(c);
		if (ro.arch) {
			rz_config_set(c->config, "asm.arch", ro.arch);
			rz_config_set(c2->config, "asm.arch", ro.arch);
		}
		if (ro.bits) {
			rz_config_set_i(c->config, "asm.bits", ro.bits);
			rz_config_set_i(c2->config, "asm.bits", ro.bits);
		}
		if (columnSort) {
			rz_config_set(c->config, "diff.sort", columnSort);
			rz_config_set(c2->config, "diff.sort", columnSort);
		}
		rz_config_set_i(c->config, "diff.bare", ro.showbare);
		rz_config_set_i(c2->config, "diff.bare", ro.showbare);
		rz_analysis_diff_setup_i(c->analysis, ro.diffops, ro.threshold, ro.threshold);
		rz_analysis_diff_setup_i(c2->analysis, ro.diffops, ro.threshold, ro.threshold);
		if (ro.pdc) {
			if (!addr) {
				//addr = "entry0";
				addr = "main";
			}
			/* should be in mode not in bool pdc */
			rz_config_set_i(c->config, "scr.color", COLOR_MODE_DISABLED);
			rz_config_set_i(c2->config, "scr.color", COLOR_MODE_DISABLED);

			ut64 addra = rz_num_math(c->num, addr);
			bufa = (ut8 *)rz_core_cmd_strf(c, "af;pdc @ 0x%08" PFMT64x, addra);
			sza = (ut64)strlen((const char *)bufa);

			ut64 addrb = rz_num_math(c2->num, addr);
			bufb = (ut8 *)rz_core_cmd_strf(c2, "af;pdc @ 0x%08" PFMT64x, addrb);
			szb = (ut64)strlen((const char *)bufb);
			ro.mode = MODE_DIFF;
		} else if (ro.mode == MODE_GRAPH) {
			int depth = rz_config_get_i(c->config, "analysis.depth");
			if (depth < 1) {
				depth = 64;
			}
			char *words = strdup(addr ? addr : "0");
			char *second = strchr(words, ',');
			if (second) {
				*second++ = 0;
				ut64 off = rz_num_math(c->num, words);
				// define the same function at each offset
				rz_core_analysis_fcn(c, off, UT64_MAX, RZ_ANALYSIS_REF_TYPE_NULL, depth);
				rz_core_analysis_fcn(c2, rz_num_math(c2->num, second),
					UT64_MAX, RZ_ANALYSIS_REF_TYPE_NULL, depth);
				rz_core_gdiff(c, c2);
				__print_diff_graph(c, off, ro.gmode);
			} else {
				rz_core_analysis_fcn(c, rz_num_math(c->num, words),
					UT64_MAX, RZ_ANALYSIS_REF_TYPE_NULL, depth);
				rz_core_analysis_fcn(c2, rz_num_math(c2->num, words),
					UT64_MAX, RZ_ANALYSIS_REF_TYPE_NULL, depth);
				rz_core_gdiff(c, c2);
				__print_diff_graph(c, rz_num_math(c->num, addr), ro.gmode);
			}
			free(words);
			free(second);
		} else if (ro.mode == MODE_CODE) {
			if (ro.zignatures) {
				rz_core_cmd0(c, "z~?");
				rz_core_cmd0(c2, "z~?");
				rz_core_zdiff(c, c2);
			} else {
				rz_core_gdiff(c, c2);
				rz_core_diff_show(c, c2);
			}
		} else if (ro.mode == MODE_DIFF_IMPORTS) {
			int sz;
			bufa = get_imports(c, &sz);
			sza = sz;
			bufb = get_imports(c2, &sz);
			szb = sz;
		} else if (ro.mode == MODE_DIFF_STRS) {
			int sz;
			bufa = get_strings(c, &sz);
			sza = sz;
			bufb = get_strings(c2, &sz);
			szb = sz;
		}
		if (ro.mode == MODE_CODE || ro.mode == MODE_GRAPH) {
			rz_cons_flush();
		}
		rz_core_free(c);
		rz_core_free(c2);

		if (ro.mode == MODE_CODE || ro.mode == MODE_GRAPH) {
			return 0;
		}
		break;
	default: {
		size_t fsz = 0;
		bufa = slurp(&ro, &c, ro.file, &fsz);
		sza = fsz;
		if (!bufa) {
			eprintf("rz-diff: Cannot open %s\n", rz_str_get_null(ro.file));
			return 1;
		}
		bufb = slurp(&ro, &c, ro.file2, &fsz);
		szb = fsz;
		if (!bufb) {
			eprintf("rz-diff: Cannot open: %s\n", rz_str_get_null(ro.file2));
			free(bufa);
			return 1;
		}
		if (sza != szb) {
			eprintf("File size differs %" PFMT64u " vs %" PFMT64u "\n", (ut64)sza, (ut64)szb);
		}
		break;
	}
	}

	// initialize RzCons
	(void)rz_cons_new();

	switch (ro.mode) {
	case MODE_COLSII:
		if (!c && !rz_list_empty(ro.evals)) {
			c = opencore(&ro, NULL);
		}
		dump_cols_hexii(bufa, (int)sza, bufb, (int)szb, (rz_cons_get_size(NULL) > 112) ? 16 : 8);
		break;
	case MODE_COLS:
		if (!c && !rz_list_empty(ro.evals)) {
			c = opencore(&ro, NULL);
		}
		dump_cols(bufa, (int)sza, bufb, (int)szb, (rz_cons_get_size(NULL) > 112) ? 16 : 8);
		break;
	case MODE_DIFF:
	case MODE_DIFF_STRS:
	case MODE_DIFF_IMPORTS:
		d = rz_diff_new();
		rz_diff_set_delta(d, delta);
		if (ro.diffmode == 'j') {
			pj_o(ro.pj);
			pj_ka(ro.pj, "files");
			fileobj(&ro, ro.file, bufa, sza);
			fileobj(&ro, ro.file2, bufb, szb);
			pj_end(ro.pj);
			pj_ka(ro.pj, "changes");
		}
		if (ro.diffmode == 'B') {
			rz_xwrite(1, "\xd1\xff\xd1\xff\x04", 5);
		}
		if (ro.diffmode == 'U') {
			char *res = rz_diff_buffers_unified(d, bufa, (int)sza, bufb, (int)szb);
			if (res) {
				printf("%s", res);
				free(res);
			}
		} else if (ro.diffmode == 'B') {
			rz_diff_set_callback(d, &bcb, &ro);
			rz_diff_buffers(d, bufa, (ut32)sza, bufb, (ut32)szb);
			rz_xwrite(1, "\x00", 1);
		} else {
			rz_diff_set_callback(d, &cb, &ro); // (void *)(size_t)diffmode);
			rz_diff_buffers(d, bufa, (ut32)sza, bufb, (ut32)szb);
		}
		if (ro.diffmode == 'j') {
			pj_end(ro.pj);
		}
		rz_diff_free(d);
		break;
	case MODE_DIST_MYERS:
	case MODE_DIST_LEVENSHTEIN: {
		RzDiff *d = rz_diff_new();
		if (d) {
			d->verbose = ro.verbose;
			if (ro.mode == MODE_DIST_MYERS) {
				d->type = 'm';
			} else {
				d->type = 'l';
			}
			rz_diff_buffers_distance(d, bufa, (ut32)sza, bufb, (ut32)szb, &ro.count, &sim);
			rz_diff_free(d);
		}
	}
		printf("similarity: %.3f\n", sim);
		printf("distance: %d\n", ro.count);
		break;
	}
	rz_cons_free();

	if (ro.diffmode == 'j' && ro.showcount) {
		pj_kd(ro.pj, "count", ro.count);
	} else if (ro.showcount && ro.diffmode != 'j') {
		printf("%d\n", ro.count);
	}
	if (ro.pj) {
		pj_end(ro.pj);
		char *s = pj_drain(ro.pj);
		rz_cons_println(s);
		free(s);
		ro.pj = NULL;
	}
	free(bufa);
	free(bufb);
	rzdiff_options_fini(&ro);

	return 0;
}