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diff --git a/mixlib/mix_code_file.h b/mixlib/mix_code_file.h
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+/* -*-c-*- ---------------- mix_code_file.h :
+ * Declaration of mix_code_file_t, a file containing compiled mix 
+ * instructions.
+ * ------------------------------------------------------------------
+ * Copyright (C) 2000 Free Software Foundation, Inc.
+ *  
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *  
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *  
+ */
+
+
+#ifndef MIX_CODE_FILE_H
+#define MIX_CODE_FILE_H
+
+#include "mix_file.h"
+#include "mix_ins.h"
+#include "mix_symbol_table.h"
+
+/* mix_code_file_t type */
+typedef struct mix_code_file_t mix_code_file_t;
+
+/* instructions are loaded at specific memory addresses and related to
+   source line numbers
+*/
+typedef struct mix_ins_desc_t mix_ins_desc_t;
+struct mix_ins_desc_t 
+{
+  mix_word_t ins;		/* a mix instruction coded into a word */
+  mix_address_t address;	/* the address of this instruction */
+  guint lineno;			/* source file line no. */
+};
+
+/* mix code files have a default extension (.mix) which is customizable */
+extern const gchar *
+mix_code_file_get_defext(void);
+
+extern gboolean
+mix_code_file_set_defext(const gchar *ext);
+
+/* create/destroy code files for read or write */
+/* if -name- does not end with defext, it is automatically appended */
+extern mix_code_file_t *
+mix_code_file_new_read(const gchar *name);
+
+/* open a code file for write with/out debug information */
+extern mix_code_file_t *
+mix_code_file_new_write(const gchar *name, mix_address_t start,
+			const gchar *source_path, gboolean debug,
+			const mix_symbol_table_t *table);
+
+extern void
+mix_code_file_delete(mix_code_file_t *file);
+
+/* get general parameters from a code file */
+extern gboolean
+mix_code_file_is_debug(const mix_code_file_t *file);
+
+extern gint
+mix_code_file_major_version(const mix_code_file_t *file);
+
+extern gint
+mix_code_file_minor_version(const mix_code_file_t *file);
+
+extern mix_address_t
+mix_code_file_get_start_addr(const mix_code_file_t *file);
+
+extern mix_symbol_table_t *
+mix_code_file_get_symbol_table(mix_code_file_t *file);
+
+/* read instructions from a code file */
+extern gboolean
+mix_code_file_is_eof(mix_code_file_t *file);
+
+extern gboolean
+mix_code_file_get_ins(mix_code_file_t *file, mix_ins_desc_t *desc);
+
+/* write instructions to a code file */
+extern gboolean
+mix_code_file_write_ins(mix_code_file_t *file, const mix_ins_desc_t *desc);
+
+extern gboolean
+mix_code_file_write_next_ins(mix_code_file_t *file, mix_word_t ins, 
+			     guint lineno);
+
+extern gboolean
+mix_code_file_set_address(mix_code_file_t *file, mix_address_t address);
+
+/* get details about the source file */
+extern const gchar *
+mix_code_file_get_source_path (const mix_code_file_t *file);
+ 
+
+#endif /* MIX_CODE_FILE_H */
+