/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*
* Copyright 2001 Ximian, Inc. (www.ximian.com)
*
* 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., 59 Temple Street #330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gmime-filter-html.h"
#include "strlib.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
static void filter_destroy (GMimeFilter *filter);
static GMimeFilter *filter_copy (GMimeFilter *filter);
static void filter_filter (GMimeFilter *filter, char *in, size_t len,
size_t prespace, char **out,
size_t *outlen, size_t *outprespace);
static void filter_complete (GMimeFilter *filter, char *in, size_t len,
size_t prespace, char **out,
size_t *outlen, size_t *outprespace);
static void filter_reset (GMimeFilter *filter);
static GMimeFilter filter_template = {
NULL, NULL, NULL, NULL,
0, 0, NULL, 0, 0,
filter_destroy,
filter_copy,
filter_filter,
filter_complete,
filter_reset,
};
/**
* g_mime_filter_html_new:
* @flags: html flags
* @colour: citation colour
*
* Creates a new GMimeFilterHTML filter.
*
* Returns a new html filter.
**/
GMimeFilter *
g_mime_filter_html_new (guint32 flags, guint32 colour)
{
GMimeFilterHTML *new;
new = g_new (GMimeFilterHTML, 1);
new->flags = flags;
new->colour = colour;
g_mime_filter_construct (GMIME_FILTER (new), &filter_template);
return GMIME_FILTER (new);
}
static void
filter_destroy (GMimeFilter *filter)
{
g_free (filter);
}
static GMimeFilter *
filter_copy (GMimeFilter *filter)
{
GMimeFilterHTML *html = (GMimeFilterHTML *) filter;
return g_mime_filter_html_new (html->flags, html->colour);
}
static char *
check_size (GMimeFilter *filter, char *outptr, char **outend, size_t len)
{
size_t offset;
if (*outend - outptr >= len)
return outptr;
offset = outptr - filter->outbuf;
g_mime_filter_set_size (filter, filter->outsize + len, TRUE);
*outend = filter->outbuf + filter->outsize;
return filter->outbuf + offset;
}
/* 1 = non-email-address chars: "()<>@,;:\\\"/[]`'|\n\t " */
/* 2 = non-url chars: "()<>,;\\\"[]`'|\n\t " */
/* 3 = trailing url garbage: ",.!?;:>)]}\\`'-_|\n\t " */
static unsigned short special_chars[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 7, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
7, 4, 3, 0, 0, 0, 0, 7, 3, 7, 0, 0, 7, 4, 4, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 7, 3, 0, 7, 4,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 7, 3, 0, 4,
7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 4, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define IS_NON_ADDR (1 << 0)
#define IS_NON_URL (1 << 1)
#define IS_GARBAGE (1 << 2)
#define NON_EMAIL_CHARS "()<>@,;:\\\"/[]`'|\n\t "
#define NON_URL_CHARS "()<>,;\\\"[]`'|\n\t "
#define TRAILING_URL_GARBAGE ",.!?;:>)}\\`'-_|\n\t "
#define is_addr_char(c) (isprint ((int) c) && !(special_chars[(unsigned char) c] & IS_NON_ADDR))
#define is_url_char(c) (isprint ((int) c) && !(special_chars[(unsigned char) c] & IS_NON_URL))
#define is_trailing_garbage(c) (!isprint ((int) c) || (special_chars[(unsigned char) c] & IS_GARBAGE))
#if 0
/* this is for building the special_chars table... */
static void
table_init (void)
{
char *c;
memset (special_chars, 0, sizeof (special_chars));
for (c = NON_EMAIL_CHARS; *c; c++)
special_chars[(int) *c] |= IS_NON_ADDR;
for (c = NON_URL_CHARS; *c; c++)
special_chars[(int) *c] |= IS_NON_URL;
for (c = TRAILING_URL_GARBAGE; *c; c++)
special_chars[(int) *c] |= IS_GARBAGE;
}
#endif
static char *
url_extract (char **in, int inlen, gboolean check, gboolean *backup)
{
unsigned char *inptr, *inend, *p;
char *url;
inptr = (unsigned char *) *in;
inend = inptr + inlen;
while (inptr < inend && is_url_char (*inptr))
inptr++;
if ((char *) inptr == *in)
return NULL;
/* back up if we probably went too far. */
while (inptr > (unsigned char *) *in && is_trailing_garbage (*(inptr - 1)))
inptr--;
if (check) {
/* make sure we weren't fooled. */
p = memchr (*in, ':', (unsigned) ((char *) inptr - *in));
if (!p)
return NULL;
}
if (inptr == inend && backup) {
*backup = TRUE;
return NULL;
}
url = g_strndup (*in, (unsigned) ((char *) inptr - *in));
*in = inptr;
return url;
}
static char *
email_address_extract (char **in, char *inend, char *start, char **outptr, gboolean *backup)
{
char *addr, *pre, *end, *dot;
/* *in points to the '@'. Look backward for a valid local-part */
for (pre = *in; pre - 1 >= start && is_addr_char (*(pre - 1)); pre--);
if (pre == *in)
return NULL;
/* Now look forward for a valid domain part */
for (end = *in + 1, dot = NULL; end < inend && is_addr_char (*end); end++) {
if (*end == '.' && !dot)
dot = end;
}
if (end >= inend && backup) {
*backup = TRUE;
*outptr -= (*in - pre);
*in = pre;
return NULL;
}
if (!dot)
return NULL;
/* Remove trailing garbage */
while (end > *in && is_trailing_garbage (*(end - 1)))
end--;
if (dot > end)
return NULL;
addr = g_strndup (pre, (unsigned) (end - pre));
*outptr -= (*in - pre);
*in = end;
return addr;
}
static gboolean
is_citation (char *inptr, char *inend, gboolean saw_citation, gboolean *backup)
{
if (*inptr != '>')
return FALSE;
if (inend - inptr >= 6) {
/* make sure this isn't just mbox From-magling... */
if (strncmp (inptr, ">From ", 6) != 0)
return TRUE;
} else if (backup) {
/* we don't have enough data to tell, so return */
*backup = TRUE;
return saw_citation;
}
/* if the previous line was a citation, then say this one is too */
if (saw_citation)
return TRUE;
/* otherwise it was just an isolated ">From " line */
return FALSE;
}
static gboolean
is_protocol (char *inptr, char *inend, gboolean *backup)
{
if (inend - inptr >= 8) {
if (!strncasecmp (inptr, "http://", 7) ||
!strncasecmp (inptr, "https://", 8) ||
!strncasecmp (inptr, "ftp://", 6) ||
!strncasecmp (inptr, "nntp://", 7) ||
!strncasecmp (inptr, "mailto:", 7) ||
!strncasecmp (inptr, "news:", 5))
return TRUE;
} else if (backup) {
*backup = TRUE;
return FALSE;
}
return FALSE;
}
static void
html_convert (GMimeFilter *filter, char *in, size_t inlen, size_t prespace,
char **out, size_t *outlen, size_t *outprespace, gboolean flush)
{
GMimeFilterHTML *html = (GMimeFilterHTML *) filter;
char *inptr, *inend, *outptr, *outend, *start;
gboolean backup = FALSE;
g_mime_filter_set_size (filter, inlen * 2 + 6, FALSE);
inptr = start = in;
inend = in + inlen;
outptr = filter->outbuf;
outend = filter->outbuf + filter->outsize;
if (html->flags & GMIME_FILTER_HTML_PRE && !html->pre_open) {
outptr = stpcpy (outptr, "<pre>");
html->pre_open = TRUE;
}
while (inptr < inend) {
unsigned char u;
if (html->flags & GMIME_FILTER_HTML_MARK_CITATION && html->column == 0) {
html->saw_citation = is_citation (inptr, inend, html->saw_citation,
flush ? &backup : NULL);
if (backup)
break;
if (html->saw_citation) {
if (!html->coloured) {
char font[25];
g_snprintf (font, 25, "<font color=\"#%06x\">", html->colour);
outptr = check_size (filter, outptr, &outend, 25);
outptr = stpcpy (outptr, font);
html->coloured = TRUE;
}
} else if (html->coloured) {
outptr = check_size (filter, outptr, &outend, 10);
outptr = stpcpy (outptr, "</font>");
html->coloured = FALSE;
}
/* display mbox-mangled ">From " as "From " */
if (*inptr == '>' && !html->saw_citation)
inptr++;
} else if (html->flags & GMIME_FILTER_HTML_CITE && html->column == 0) {
outptr = check_size (filter, outptr, &outend, 6);
outptr = stpcpy (outptr, "> ");
}
if (html->flags & GMIME_FILTER_HTML_CONVERT_URLS && isalpha ((int) *inptr)) {
char *refurl = NULL, *dispurl = NULL;
if (is_protocol (inptr, inend, flush ? &backup : NULL)) {
dispurl = url_extract (&inptr, inend - inptr, TRUE,
flush ? &backup : NULL);
if (backup)
break;
if (dispurl)
refurl = g_strdup (dispurl);
} else {
if (backup)
break;
if (!strncasecmp (inptr, "www.", 4) && ((unsigned char) inptr[4]) < 0x80
&& isalnum ((int) inptr[4])) {
dispurl = url_extract (&inptr, inend - inptr, FALSE,
flush ? &backup : NULL);
if (backup)
break;
if (dispurl)
refurl = g_strdup_printf ("http://%s", dispurl);
}
}
if (dispurl) {
outptr = check_size (filter, outptr, &outend,
strlen (refurl) +
strlen (dispurl) + 15);
outptr += sprintf (outptr, "<a href=\"%s\">%s</a>",
refurl, dispurl);
html->column += strlen (dispurl);
g_free (refurl);
g_free (dispurl);
}
if (inptr >= inend)
break;
}
if (*inptr == '@' && (html->flags & GMIME_FILTER_HTML_CONVERT_ADDRESSES)) {
char *addr, *dispaddr, *outaddr;
addr = email_address_extract (&inptr, inend, start, &outptr,
flush ? &backup : NULL);
if (backup)
break;
if (addr) {
dispaddr = g_strdup (addr);
outaddr = g_strdup_printf ("<a href=\"mailto:%s\">%s</a>",
addr, dispaddr);
outptr = check_size (filter, outptr, &outend, strlen (outaddr));
outptr = stpcpy (outptr, outaddr);
html->column += strlen (addr);
g_free (addr);
g_free (dispaddr);
g_free (outaddr);
}
}
outptr = check_size (filter, outptr, &outend, 32);
switch ((u = (unsigned char) *inptr++)) {
case '<':
outptr = stpcpy (outptr, "<");
html->column++;
break;
case '>':
outptr = stpcpy (outptr, ">");
html->column++;
break;
case '&':
outptr = stpcpy (outptr, "&");
html->column++;
break;
case '"':
outptr = stpcpy (outptr, """);
html->column++;
break;
case '\n':
if (html->flags & GMIME_FILTER_HTML_CONVERT_NL)
outptr = stpcpy (outptr, "<br>");
*outptr++ = '\n';
start = inptr;
html->column = 0;
break;
case '\t':
if (html->flags & (GMIME_FILTER_HTML_CONVERT_SPACES)) {
do {
outptr = check_size (filter, outptr, &outend, 7);
outptr = stpcpy (outptr, " ");
html->column++;
} while (html->column % 8);
break;
}
/* otherwise, FALL THROUGH */
case ' ':
if (html->flags & GMIME_FILTER_HTML_CONVERT_SPACES) {
if (inptr == in || (inptr < inend && (*(inptr + 1) == ' ' ||
*(inptr + 1) == '\t' ||
*(inptr - 1) == '\n'))) {
outptr = stpcpy (outptr, " ");
html->column++;
break;
}
}
/* otherwise, FALL THROUGH */
default:
if ((u >= 0x20 && u < 0x80) ||
(u == '\r' || u == '\t')) {
/* Default case, just copy. */
*outptr++ = (char) u;
} else {
if (html->flags & GMIME_FILTER_HTML_ESCAPE_8BIT)
*outptr++ = '?';
else
outptr += g_snprintf (outptr, 9, "&#%d;", (int) u);
}
html->column++;
break;
}
}
if (inptr < inend)
g_mime_filter_backup (filter, inptr, (unsigned) (inend - inptr));
if (flush && html->pre_open) {
outptr = check_size (filter, outptr, &outend, 10);
outptr = stpcpy (outptr, "</pre>");
}
*out = filter->outbuf;
*outlen = outptr - filter->outbuf;
*outprespace = filter->outpre;
}
static void
filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace)
{
html_convert (filter, in, len, prespace, out, outlen, outprespace, FALSE);
}
static void
filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace)
{
html_convert (filter, in, len, prespace, out, outlen, outprespace, TRUE);
}
static void
filter_reset (GMimeFilter *filter)
{
GMimeFilterHTML *html = (GMimeFilterHTML *) filter;
html->column = 0;
html->pre_open = FALSE;
html->saw_citation = FALSE;
html->coloured = FALSE;
}
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