/* GLIB - Library of useful routines for C programming
 *
 * gconvert.c: Convert between character sets using iconv
 * Copyright Red Hat Inc., 2000
 * Authors: Havoc Pennington <hp@redhat.com>, Owen Taylor <otaylor@redhat.com
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#include <glib.h>
#include "mono-uri.h"

typedef enum {
  UNSAFE_ALL        = 0x1,  /* Escape all unsafe characters   */
  UNSAFE_ALLOW_PLUS = 0x2,  /* Allows '+'  */
  UNSAFE_PATH       = 0x4,  /* Allows '/' and '?' and '&' and '='  */
  UNSAFE_DOS_PATH   = 0x8,  /* Allows '/' and '?' and '&' and '=' and ':' */
  UNSAFE_HOST       = 0x10, /* Allows '/' and ':' and '@' */
  UNSAFE_SLASHES    = 0x20  /* Allows all characters except for '/' and '%' */
} UnsafeCharacterSet;

static const guchar acceptable[96] = {
  /* A table of the ASCII chars from space (32) to DEL (127) */
  /*      !    "    #    $    %    &    '    (    )    *    +    ,    -    .    / */ 
  0x00,0x3F,0x20,0x20,0x20,0x00,0x2C,0x3F,0x3F,0x3F,0x3F,0x22,0x20,0x3F,0x3F,0x1C,
  /* 0    1    2    3    4    5    6    7    8    9    :    ;    <    =    >    ? */
  0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x38,0x20,0x20,0x2C,0x20,0x2C,
  /* @    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O */
  0x30,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
  /* P    Q    R    S    T    U    V    W    X    Y    Z    [    \    ]    ^    _ */
  0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x20,0x20,0x20,0x20,0x3F,
  /* `    a    b    c    d    e    f    g    h    i    j    k    l    m    n    o */
  0x20,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
  /* p    q    r    s    t    u    v    w    x    y    z    {    |    }    ~  DEL */
  0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x20,0x20,0x20,0x3F,0x20
};

static const gchar hex[] = "0123456789ABCDEF";

/* Note: This escape function works on file: URIs, but if you want to
 * escape something else, please read RFC-2396 */
gchar *
mono_escape_uri_string (const gchar *string)
{
#define ACCEPTABLE(a) ((a)>=32 && (a)<128 && (acceptable[(a)-32] & use_mask))

  const gchar *p;
  gchar *q;
  gchar *result;
  int c;
  gint unacceptable;
  UnsafeCharacterSet use_mask;
  
  unacceptable = 0;
  use_mask = UNSAFE_DOS_PATH;
  for (p = string; *p != '\0'; p++)
    {
      c = (guchar) *p;
      if (!ACCEPTABLE (c)) 
	unacceptable++;
    }
  
  result = g_malloc (p - string + unacceptable * 2 + 1);
  
  for (q = result, p = string; *p != '\0'; p++)
    {
      c = (guchar) *p;
      
      if (!ACCEPTABLE (c))
	{
	  *q++ = '%'; /* means hex coming */
	  *q++ = hex[c >> 4];
	  *q++ = hex[c & 15];
	}
      else
	*q++ = *p;
    }
  
  *q = '\0';
  
  return result;
}

main ()
{
	char *s = malloc (256);
	int i = 0;
	
	s [255] = 0;

	for (i = 1; i < 256; i++)
		s [i-1] = i;

	printf ("escape: %s\n", mono_escape_uri_string (s));

}