diff --git a/Makefile b/Makefile
index 2062daa..a4c9abf 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,6 @@ dist:
 		$(PACKAGE)-$(VERSION)/src/deasm.c \
 		$(PACKAGE)-$(VERSION)/src/Makefile \
 		$(PACKAGE)-$(VERSION)/src/arch.h \
-		$(PACKAGE)-$(VERSION)/src/asm.h \
 		$(PACKAGE)-$(VERSION)/src/code.h \
 		$(PACKAGE)-$(VERSION)/src/common.h \
 		$(PACKAGE)-$(VERSION)/src/format.h \
diff --git a/include/Asm/asm.h b/include/Asm/asm.h
index 734e7c2..90f8e4a 100644
--- a/include/Asm/asm.h
+++ b/include/Asm/asm.h
@@ -19,13 +19,35 @@
 # define DEVEL_ASM_ASM_H
 
 # include <stdio.h>
-# include "arch.h"
 
 
 /* Asm */
 /* types */
 typedef struct _Asm Asm;
 
+typedef unsigned int AsmId;
+
+typedef struct _AsmFunction
+{
+	AsmId id;
+	char const * name;
+	off_t offset;
+	ssize_t size;
+} AsmFunction;
+
+typedef struct _AsmLabel
+{
+	char const * name;
+	off_t offset;
+} AsmLabel;
+
+typedef struct _AsmString
+{
+	AsmId id;
+	char const * string;
+	ssize_t size;
+} AsmString;
+
 typedef enum _AsmPluginType { APT_ARCH = 0, APT_FORMAT } AsmPluginType;
 
 
@@ -35,21 +57,53 @@ void asm_delete(Asm * a);
 
 
 /* accessors */
-char const * asm_get_arch_name(Asm * a);
-char const * asm_get_format_name(Asm * a);
+/* detection */
+char const * asm_get_arch(Asm * a);
+int asm_set_arch(Asm * a, char const * arch);
+
+char const * asm_get_format(Asm * a);
+int asm_set_format(Asm * a, char const * format);
+
+/* functions */
+AsmFunction * asm_get_function_by_name(Asm * a, char const * name);
+int asm_set_function(Asm * a, char const * name, off_t offset, int whence,
+		ssize_t size);
+
+/* labels */
+AsmLabel * asm_get_label_by_name(Asm * a, char const * label);
+AsmLabel * asm_get_label_by_offset(Asm * a, off_t offset);
+int asm_set_label(Asm * a, char const * label, off_t offset, int whence);
+
+/* sections */
+int asm_set_section(Asm * a, char const * name, off_t offset, int whence,
+		ssize_t size);
+
+/* strings */
+AsmString * asm_get_string_by_id(Asm * a, AsmId id);
+AsmString * asm_get_string_by_name(Asm * a, char const * name);
+int asm_set_string(Asm * a, int id, char const * name, off_t offset,
+		int whence, ssize_t size);
 
 
 /* useful */
-int asm_decode(Asm * a, char const * buffer, size_t size);
-int asm_decode_file(Asm * a, char const * filename, FILE * fp);
-int asm_parse(Asm * a, char const * infile, char const * outfile);
+/* detection */
+int asm_guess_arch(Asm * a);
+int asm_guess_format(Asm * a);
+
+/* common */
+int asm_close(Asm * a);
+
+/* assemble */
+int asm_assemble(Asm * a, char const * infile, char const * outfile);
+int asm_open_assemble(Asm * a, char const * infile, char const * outfile);
 
-int asm_section(Asm * a, char const * name);
-int asm_function(Asm * a, char const * name);
 int asm_instruction(Asm * a, char const * name, unsigned int operands_cnt, ...);
 
+/* deassemble */
+int asm_deassemble(Asm * a, char const * buffer, size_t size);
+int asm_open_deassemble(Asm * a, char const * filename);
 
-/* plugins helpers */
+/* plug-in helpers */
 int asm_plugin_list(AsmPluginType type);
 
 #endif /* !DEVEL_ASM_AS_H */
diff --git a/src/Makefile b/src/Makefile
index 16e12e0..e118b3c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -52,7 +52,7 @@ deasm: $(deasm_OBJS) libasm.so
 arch.o: arch.c arch.h ../config.h
 	$(CC) $(libasm_CFLAGS) -c arch.c
 
-asm.o: asm.c ../include/Asm.h code.h parser.h asm.h ../config.h
+asm.o: asm.c ../include/Asm.h code.h parser.h ../config.h
 	$(CC) $(libasm_CFLAGS) -c asm.c
 
 code.o: code.c ../include/Asm.h arch.h code.h
diff --git a/src/asm.c b/src/asm.c
index 44d7fc1..d42c7ba 100644
--- a/src/asm.c
+++ b/src/asm.c
@@ -26,7 +26,6 @@
 #include <errno.h>
 #include "code.h"
 #include "parser.h"
-#include "asm.h"
 #include "../config.h"
 
 
@@ -35,6 +34,9 @@
 /* types */
 struct _Asm
 {
+	char * arch;
+	char * format;
+
 	Code * code;
 };
 
@@ -49,8 +51,6 @@ typedef struct _AsmPluginDescription
 #define APT_LAST	APT_FORMAT
 #define APT_COUNT	(APT_LAST + 1)
 
-
-/* variables */
 static const AsmPluginDescription _asm_plugin_description[APT_COUNT] =
 {
 	{ "arch",	"architecture"	},
@@ -60,26 +60,9 @@ static const AsmPluginDescription _asm_plugin_description[APT_COUNT] =
 
 /* prototypes */
 static char const * _asm_guess_arch(void);
+static char const * _asm_guess_format(void);
 
-
-/* functions */
-/* asm_guess_arch */
-static char const * _asm_guess_arch(void)
-{
-	static struct utsname uts;
-	static int cached = 0;
-
-	if(cached == 0)
-	{
-		if(uname(&uts) != 0)
-		{
-			error_set_code(1, "%s", strerror(errno));
-			return NULL;
-		}
-		cached = 1;
-	}
-	return uts.machine;
-}
+static int _asm_open(Asm * a, char const * outfile);
 
 
 /* public */
@@ -91,9 +74,11 @@ Asm * asm_new(char const * arch, char const * format)
 
 	if((a = object_new(sizeof(*a))) == NULL)
 		return NULL;
-	if(arch == NULL)
-		arch = _asm_guess_arch();
-	if((a->code = code_new(arch, format)) == NULL)
+	a->arch = (arch != NULL) ? string_new(arch) : NULL;
+	a->format = (format != NULL) ? string_new(format) : NULL;
+	a->code = NULL;
+	if((arch != NULL && a->arch == NULL)
+			|| (format != NULL && a->format == NULL))
 	{
 		object_delete(a);
 		return NULL;
@@ -105,76 +90,36 @@ Asm * asm_new(char const * arch, char const * format)
 /* asm_delete */
 void asm_delete(Asm * a)
 {
-	code_delete(a->code);
+	if(a->code != NULL)
+		code_delete(a->code);
+	string_delete(a->format);
+	string_delete(a->arch);
 	object_delete(a);
 }
 
 
 /* accessors */
 /* asm_get_arch */
-Arch * asm_get_arch(Asm * a)
+char const * asm_get_arch(Asm * a)
 {
-	return code_get_arch(a->code);
-}
-
-
-/* asm_get_arch_name */
-char const * asm_get_arch_name(Asm * a)
-{
-	return code_get_arch_name(a->code);
+	return a->arch;
 }
 
 
 /* asm_get_format */
-Format * asm_get_format(Asm * a)
+char const * asm_get_format(Asm * a)
 {
-	return code_get_format(a->code);
-}
-
-
-/* asm_get_format_name */
-char const * asm_get_format_name(Asm * a)
-{
-	return code_get_format_name(a->code);
+	return a->format;
 }
 
 
 /* useful */
-/* asm_close */
-int asm_close(Asm * a)
-{
-	return code_close(a->code);
-}
-
-
-/* asm_decode */
-int asm_decode(Asm * a, char const * buffer, size_t size)
-{
-	return code_decode(a->code, buffer, size);
-}
-
-
-/* asm_decode_file */
-int asm_decode_file(Asm * a, char const * filename, FILE * fp)
+/* asm_assemble */
+int asm_assemble(Asm * a, char const * infile, char const * outfile)
 {
 	int ret;
 
-	if(fp != NULL)
-		return code_decode_file(a->code, filename, fp);
-	if((fp = fopen(filename, "r")) == NULL)
-		return -error_set_code(1, "%s: %s", filename, strerror(errno));
-	ret = code_decode_file(a->code, filename, fp);
-	fclose(fp);
-	return ret;
-}
-
-
-/* asm_parse */
-int asm_parse(Asm * a, char const * infile, char const * outfile)
-{
-	int ret;
-
-	if(asm_open(a, outfile) != 0)
+	if(_asm_open(a, outfile) != 0)
 		return -1;
 	ret = parser(a->code, infile);
 	if(ret != 0 && unlink(outfile) != 0)
@@ -184,10 +129,38 @@ int asm_parse(Asm * a, char const * infile, char const * outfile)
 }
 
 
-/* asm_open */
-int asm_open(Asm * a, char const * outfile)
+/* asm_close */
+int asm_close(Asm * a)
 {
-	return code_open(a->code, outfile);
+	int ret;
+
+	if(a->code == NULL)
+		return -error_set_code(1, "%s", "No file opened");
+	ret = code_close(a->code);
+	a->code = NULL;
+	return ret;
+}
+
+
+/* asm_deassemble */
+int asm_deassemble(Asm * a, char const * buffer, size_t size)
+{
+	int ret;
+
+	if(_asm_open(a, NULL) != 0)
+		return -1;
+	ret = code_decode(a->code, buffer, size);
+	asm_close(a);
+	return ret;
+}
+
+
+/* asm_open_deassemble */
+int asm_open_deassemble(Asm * a, char const * filename)
+{
+	if(_asm_open(a, NULL) != 0)
+		return -1;
+	return code_decode_file(a->code, filename);
 }
 
 
@@ -272,3 +245,53 @@ int asm_plugin_list(AsmPluginType type)
 	fputc('\n', stderr);
 	return 0;
 }
+
+
+/* private */
+/* functions */
+/* asm_guess_arch */
+static char const * _asm_guess_arch(void)
+{
+	static struct utsname uts;
+	static int cached = 0;
+
+	if(cached == 0)
+	{
+		if(uname(&uts) != 0)
+		{
+			error_set_code(1, "%s", strerror(errno));
+			return NULL;
+		}
+		cached = 1;
+	}
+	return uts.machine;
+}
+
+
+/* asm_guess_format */
+static char const * _asm_guess_format(void)
+{
+	/* FIXME really guess from known/guessed architecture plug-in */
+	return "elf";
+}
+
+
+/* asm_open */
+static int _asm_open(Asm * a, char const * outfile)
+{
+	char const * arch = a->arch;
+	char const * format = a->format;
+
+	if(arch == NULL && (arch = _asm_guess_arch()) == NULL)
+		return -1;
+	if(format == NULL)
+		format = _asm_guess_format();
+	if(a->code != NULL)
+		return -error_set_code(1, "%s: Operation in progress",
+				code_get_filename(a->code));
+	if((a->code = code_new(arch, format)) == NULL)
+		return -1;
+	if(outfile == NULL)
+		return 0;
+	return code_open(a->code, outfile);
+}
diff --git a/src/asm.h b/src/asm.h
deleted file mode 100644
index c9a2db1..0000000
--- a/src/asm.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* $Id$ */
-/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
-/* This file is part of DeforaOS Devel asm */
-/* This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, version 3 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>. */
-
-
-
-#ifndef ASM_ASM_H
-# define ASM_ASM_H
-
-# include "Asm/asm.h"
-# include "arch.h"
-# include "format.h"
-
-
-/* protected */
-/* functions */
-/* accessors */
-Arch * asm_get_arch(Asm * a);
-Format * asm_get_format(Asm * a);
-
-
-/* useful */
-int asm_open(Asm * a, char const * outfile);
-int asm_close(Asm * a);
-
-#endif /* !ASM_ASM_H */
diff --git a/src/code.c b/src/code.c
index 6169074..208d93c 100644
--- a/src/code.c
+++ b/src/code.c
@@ -85,28 +85,21 @@ int code_delete(Code * code)
 
 /* accessors */
 /* code_get_arch */
-Arch * code_get_arch(Code * code)
-{
-	return code->arch;
-}
-
-
-/* code_get_arch_name */
-char const * code_get_arch_name(Code * code)
+char const * code_get_arch(Code * code)
 {
 	return arch_get_name(code->arch);
 }
 
 
-/* code_get_format */
-Format * code_get_format(Code * code)
+/* code_get_filename */
+char const * code_get_filename(Code * code)
 {
-	return code->format;
+	return code->filename;
 }
 
 
-/* code_get_format_name */
-char const * code_get_format_name(Code * code)
+/* code_get_format */
+char const * code_get_format(Code * code)
 {
 	return format_get_name(code->format);
 }
@@ -120,7 +113,7 @@ int code_close(Code * code)
 
 	ret |= arch_exit(code->arch);
 	ret |= format_exit(code->format);
-	if(fclose(code->fp) != 0 && ret == 0)
+	if(code->fp != NULL && fclose(code->fp) != 0 && ret == 0)
 		ret |= -error_set_code(1, "%s: %s", code->filename,
 				strerror(errno));
 	code->fp = NULL;
@@ -144,15 +137,20 @@ int code_decode(Code * code, char const * buffer, size_t size)
 static int _decode_file_callback(void * priv, char const * section,
 		off_t offset, size_t size, off_t base);
 
-int code_decode_file(Code * code, char const * filename, FILE * fp)
+int code_decode_file(Code * code, char const * filename)
 {
 	int ret;
+	FILE * fp;
 
+	if((fp = fopen(filename, "r")) == NULL)
+		return -error_set_code(1, "%s: %s", filename, strerror(errno));
 	arch_init(code->arch, filename, fp);
 	format_init(code->format, filename, fp);
 	ret = format_decode(code->format, _decode_file_callback, code);
 	format_exit(code->format);
 	arch_exit(code->arch);
+	if(fclose(fp) != 0 && ret == 0)
+		ret = -error_set_code(1, "%s: %s", filename, strerror(errno));
 	return ret;
 }
 
diff --git a/src/code.h b/src/code.h
index 0fe61e7..8556d66 100644
--- a/src/code.h
+++ b/src/code.h
@@ -34,22 +34,22 @@ Code * code_new(char const * arch, char const * format);
 int code_delete(Code * code);
 
 /* accessors */
-Arch * code_get_arch(Code * code);
-char const * code_get_arch_name(Code * code);
-Format * code_get_format(Code * code);
-char const * code_get_format_name(Code * code);
+char const * code_get_arch(Code * code);
+char const * code_get_filename(Code * code);
+char const * code_get_format(Code * code);
 
 /* useful */
-/* assembly */
+/* common */
 int code_open(Code * code, char const * filename);
 int code_close(Code * code);
 
+/* assembly */
 int code_function(Code * code, char const * function);
 int code_instruction(Code * code, ArchInstructionCall * call);
 int code_section(Code * code, char const * section);
 
 /* disassembly */
 int code_decode(Code * code, char const * buffer, size_t size);
-int code_decode_file(Code * code, char const * filename, FILE * fp);
+int code_decode_file(Code * code, char const * filename);
 
 #endif /* !ASM_CODE_H */
diff --git a/src/deasm.c b/src/deasm.c
index 9528e90..2a6669d 100644
--- a/src/deasm.c
+++ b/src/deasm.c
@@ -202,16 +202,15 @@ static int _deasm_do_callback(Deasm * deasm, FormatPlugin * format)
 	if(deasm->arch == NULL)
 	{
 		if(format->detect == NULL)
-			return -error_set_code(1, "%s: %s", format->name,
+			return -error_set_code(1, "%s: %s", deasm->filename,
 					"Unable to detect the architecture");
 		if((deasm->arch = format->detect(format)) == NULL)
 			return -1;
 	}
 	if((a = asm_new(deasm->arch, format->name)) == NULL)
 		return -error_print("deasm");
-	printf("\n%s: %s-%s\n", deasm->filename, format->name,
-			asm_get_arch_name(a));
-	ret = asm_decode_file(a, deasm->filename, deasm->fp);
+	printf("\n%s: %s-%s\n", deasm->filename, format->name, asm_get_arch(a));
+	ret = asm_open_deassemble(a, deasm->filename);
 	asm_delete(a);
 	return ret;
 }
@@ -228,7 +227,7 @@ static int _deasm_buffer(char const * arch, char const * format,
 #endif
 	if((a = asm_new(arch, format)) == NULL)
 		return -1;
-	if(asm_decode(a, buffer, size) != 0)
+	if(asm_deassemble(a, buffer, size) != 0)
 		error_print("deasm");
 	asm_delete(a);
 	return 0;
diff --git a/src/main.c b/src/main.c
index 1f7bbd5..f2dc5e2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -39,7 +39,7 @@ static int _asm(char const * arch, char const * format, char const * infile,
 
 	if((a = asm_new(arch, format)) == NULL)
 		return error_print(PACKAGE);
-	if(asm_parse(a, infile, outfile) != 0)
+	if(asm_assemble(a, infile, outfile) != 0)
 		ret = error_print(PACKAGE);
 	asm_delete(a);
 	return ret;
diff --git a/src/project.conf b/src/project.conf
index d747363..a1d425d 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -5,7 +5,7 @@ cppflags=
 cflags_force=-W `pkg-config --cflags cpp`
 cflags=-Wall -g -O2 -pedantic
 ldflags_force=-ldl
-dist=Makefile,arch.h,asm.h,code.h,common.h,format.h,parser.h,token.h
+dist=Makefile,arch.h,code.h,common.h,format.h,parser.h,token.h
 
 [libasm]
 type=library
@@ -32,7 +32,7 @@ install=$(BINDIR)
 depends=arch.h,../config.h
 
 [asm.c]
-depends=../include/Asm.h,code.h,parser.h,asm.h,../config.h
+depends=../include/Asm.h,code.h,parser.h,../config.h
 
 [code.c]
 depends=../include/Asm.h,arch.h,code.h