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282
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1 /* Drag'n'Drop definitions
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2 created 03-may-98 by Oliver Graf <ograf@fga.de>
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3 Copyright (C) 1998 Oliver Graf <ograf@fga.de>
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* This file should be Mule-ized. */
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25
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26 /* A short introduction to the new Drag'n'Drop Model:
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27
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28 Currently only drops from OffiX are implemented.
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29
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30 A drop generates a extended misc-user-event, as defined in events.[ch].
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31 This event contains the same as a eval and a button event.
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32 The function of a drop is set to 'dragdrop-drop-dispatch' which will be
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33 defined in ../lisp/dragdrop.el.
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34 The object of the misc-user-event has the following format:
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35 ( TYPE . DATA )
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36 TYPE is one of 'dragdrop-MIME and 'dragdrop-URL
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37 DATA - if TYPE is 'dragdrop-URL, DATA is a list of valid URL strings. It
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38 is always a list, also if only one URL string is within it.
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39 - if TYPE is 'dragdrop-MIME, DATA is a list of MIME elements.
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40 Each can be a string or a list.
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41 if it is a string it is the pure MIME data complete with header
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42 and body.
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43 if it is a list it should look like
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44 ( MIME-TYPE MIME-ENCODING MIME-DATA )
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45 MIME-TYPE should have the format as required by tm-view, but
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46 is a string
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47 MIME-ENC the same (a string in this case)
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48 MIME-DATA is a string
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49 */
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50
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51 #include <config.h>
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52 #include "lisp.h"
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53 #include "dragdrop.h"
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54
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55 /* Drag'n'Drop data types known by XEmacs */
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56 Lisp_Object Qdragdrop_MIME;
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57 Lisp_Object Qdragdrop_URL;
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58
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59 /* External defined functions to handle Drag'n'Drop */
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60 Lisp_Object Qdragdrop_drop_dispatch;
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61
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62 /* from wget -- thanxx Hrvoje */
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63 /* A list of unsafe characters for encoding, as per RFC1738. '@' and
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64 ':' (not listed in RFC) were added because of user/password
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65 encoding, and \033 for safe printing. */
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66
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67 #define URL_UNSAFE " <>\"#%{}|\\^~[]`@:\033"
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68
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69 /* HEX digit -> ASCII char */
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70 #define HEXD2ASC(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'A'))
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71
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72 /* Encodes the unsafe characters (listed in URL_UNSAFE) in a given
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73 string, returning a malloc-ed %XX encoded string.
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74 if method is != NULL it is prepended to the string. */
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75 char *
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76 dnd_url_hexify_string (const char *s, const char *m)
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77 {
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78 const char *b;
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79 char *p, *res;
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80 int i;
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81
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82 b = s;
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83 for (i = 0; *s; s++, i++)
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84 if (strchr (URL_UNSAFE, *s))
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85 i += 2; /* Two more characters (hex digits) */
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86 if (m)
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87 {
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88 res = (char *)xmalloc (i + 1 + strlen (m));
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89 strcpy (res, m);
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90 p = res + strlen (m);
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91 }
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92 else
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93 {
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94 res = (char *)xmalloc (i + 1);
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95 p = res;
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96 }
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97 for (s = b; *s; s++)
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98 if (strchr (URL_UNSAFE, *s))
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99 {
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100 const unsigned char c = *s;
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101 *p++ = '%';
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102 *p++ = HEXD2ASC (c >> 4);
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103 *p++ = HEXD2ASC (c & 0xf);
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104 }
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105 else
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106 *p++ = *s;
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107 *p = '\0';
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108 return res;
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109 }
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110
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111 void
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112 syms_of_dragdrop (void)
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113 {
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114 defsymbol (&Qdragdrop_MIME, "dragdrop-MIME");
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115 defsymbol (&Qdragdrop_URL, "dragdrop-URL");
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116 defsymbol (&Qdragdrop_drop_dispatch, "dragdrop-drop-dispatch");
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117 }
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