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lib: detect mislabeled Windows-1252 parts

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Use GMime functionality to detect mislabeled messages and apply the
correct (Windows) encoding instead.
This commit is contained in:
Sebastian Poeplau 2018-08-07 14:48:22 +02:00 committed by David Bremner
parent 7074bb8f80
commit 0f08bf7166
2 changed files with 28 additions and 3 deletions
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30
notmuch-show.c
View file

@ -272,6 +272,7 @@ show_text_part_content (GMimeObject *part, GMimeStream *stream_out,
GMimeContentType *content_type = g_mime_object_get_content_type (GMIME_OBJECT (part));
GMimeStream *stream_filter = NULL;
GMimeFilter *crlf_filter = NULL;
GMimeFilter *windows_filter = NULL;
GMimeDataWrapper *wrapper;
const char *charset;
@ -282,13 +283,37 @@ show_text_part_content (GMimeObject *part, GMimeStream *stream_out,
if (stream_out == NULL)
return;
charset = g_mime_object_get_content_type_parameter (part, "charset");
charset = charset ? g_mime_charset_canon_name (charset) : NULL;
wrapper = g_mime_part_get_content_object (GMIME_PART (part));
if (wrapper && charset && !g_ascii_strncasecmp (charset, "iso-8859-", 9)) {
GMimeStream *null_stream = NULL;
GMimeStream *null_stream_filter = NULL;
/* Check for mislabeled Windows encoding */
null_stream = g_mime_stream_null_new ();
null_stream_filter = g_mime_stream_filter_new (null_stream);
windows_filter = g_mime_filter_windows_new (charset);
g_mime_stream_filter_add(GMIME_STREAM_FILTER (null_stream_filter),
windows_filter);
g_mime_data_wrapper_write_to_stream (wrapper, null_stream_filter);
charset = g_mime_filter_windows_real_charset(
(GMimeFilterWindows *) windows_filter);
if (null_stream_filter)
g_object_unref (null_stream_filter);
if (null_stream)
g_object_unref (null_stream);
/* Keep a reference to windows_filter in order to prevent the
* charset string from deallocation. */
}
stream_filter = g_mime_stream_filter_new (stream_out);
crlf_filter = g_mime_filter_crlf_new (false, false);
g_mime_stream_filter_add(GMIME_STREAM_FILTER (stream_filter),
crlf_filter);
g_object_unref (crlf_filter);
charset = g_mime_object_get_content_type_parameter (part, "charset");
if (charset) {
GMimeFilter *charset_filter;
charset_filter = g_mime_filter_charset_new (charset, "UTF-8");
@ -313,11 +338,12 @@ show_text_part_content (GMimeObject *part, GMimeStream *stream_out,
}
}
wrapper = g_mime_part_get_content_object (GMIME_PART (part));
if (wrapper && stream_filter)
g_mime_data_wrapper_write_to_stream (wrapper, stream_filter);
if (stream_filter)
g_object_unref(stream_filter);
if (windows_filter)
g_object_unref (windows_filter);
}
static const char*

1
test/T300-encoding.sh
View file

@ -45,7 +45,6 @@ output=$(notmuch search id:${gen_msg_id} 2>&1 | notmuch_show_sanitize)
test_expect_equal "$output" "thread:0000000000000005 2001-01-05 [1/1] Notmuch Test Suite; encodedword withoutspace (inbox unread)"
test_begin_subtest "Mislabeled Windows-1252 encoding"
test_subtest_known_broken
add_message '[content-type]="text/plain; charset=iso-8859-1"' \
"[body]=$'This text contains \x93Windows-1252\x94 character codes.'"
cat <<EOF > EXPECTED