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diff --git a/pdarg_parser.h b/pdarg_parser.h
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+++ b/pdarg_parser.h
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+/*  Pdlzip - Data compressor based on the LZMA algorithm
+    Copyright (C) 2010, 2011, 2012 Antonio Diaz Diaz.
+
+    This program is free software: you have unlimited permission
+    to copy, distribute and modify it.
+
+    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.
+*/
+
+/*  Arg_parser reads the arguments in 'argv' and creates a number of
+    option codes, option arguments and non-option arguments.
+
+    In case of error, 'ap_error' returns a non-null pointer to an error
+    message.
+
+    'options' is an array of 'struct ap_Option' terminated by an element
+    containing a code which is zero. A null name means a short-only
+    option. A code value outside the unsigned char range means a
+    long-only option.
+
+    Arg_parser normally makes it appear as if all the option arguments
+    were specified before all the non-option arguments for the purposes
+    of parsing, even if the user of your program intermixed option and
+    non-option arguments. If you want the arguments in the exact order
+    the user typed them, call 'ap_init' with 'in_order' = true.
+
+    The argument '--' terminates all options; any following arguments are
+    treated as non-option arguments, even if they begin with a hyphen.
+
+    The syntax for optional option arguments is '-<short_option><argument>'
+    (without whitespace), or '--<long_option>=<argument>'.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum ap_Has_arg { ap_no, ap_yes, ap_maybe };
+
+struct ap_Option
+  {
+  int code;			/* Short option letter or code ( code != 0 ) */
+  const char * name;		/* Long option name (maybe null) */
+  enum ap_Has_arg has_arg;
+  };
+
+
+struct ap_Record
+  {
+  int code;
+  char * argument;
+  };
+
+
+struct Arg_parser
+  {
+  struct ap_Record * data;
+  char * error;
+  int data_size;
+  int error_size;
+  };
+
+
+char ap_init( struct Arg_parser * const ap,
+              const int argc, const char * const argv[],
+              const struct ap_Option options[], const char in_order );
+
+void ap_free( struct Arg_parser * const ap );
+
+const char * ap_error( const struct Arg_parser * const ap );
+
+    /* The number of arguments parsed (may be different from argc) */
+int ap_arguments( const struct Arg_parser * const ap );
+
+    /* If ap_code( i ) is 0, ap_argument( i ) is a non-option.
+       Else ap_argument( i ) is the option's argument (or empty). */
+int ap_code( const struct Arg_parser * const ap, const int i );
+
+const char * ap_argument( const struct Arg_parser * const ap, const int i );
+
+#ifdef __cplusplus
+}
+#endif