+ if (header[0].namelen <= 0) {
+ for (i = 0; header[i].name; i++)
+ header[i].namelen = strlen(header[i].name);
+ }
+ for (i = 0; header[i].name; i++) {
+ int len = header[i].namelen;
+ if (!strncasecmp(line, header[i].name, len) &&
+ line[len] == ':' && isspace(line[len + 1])) {
+ /* Unwrap inline B and Q encoding, and optionally
+ * normalize the meta information to utf8.
+ */
+ decode_header_bq(line + len + 2);
+ header[i].func(line + len + 2);
+ break;
+ }
+ }
+}
+
+static void check_subheader_line(char *line)
+{
+ static struct header_def header[] = {
+ { "Content-Type", handle_subcontent_type },
+ { "Content-Transfer-Encoding",
+ handle_content_transfer_encoding },
+ { NULL },
+ };
+ check_header(line, header);
+}
+static void check_header_line(char *line)
+{
+ static struct header_def header[] = {
+ { "From", handle_from },
+ { "Date", handle_date },
+ { "Subject", handle_subject },
+ { "Content-Type", handle_content_type },
+ { "Content-Transfer-Encoding",
+ handle_content_transfer_encoding },
+ { NULL },
+ };
+ check_header(line, header);
+}
+
+static int is_rfc2822_header(char *line)
+{
+ /*
+ * The section that defines the loosest possible
+ * field name is "3.6.8 Optional fields".
+ *
+ * optional-field = field-name ":" unstructured CRLF
+ * field-name = 1*ftext
+ * ftext = %d33-57 / %59-126
+ */
+ int ch;
+ char *cp = line;
+ while ((ch = *cp++)) {
+ if (ch == ':')
+ return cp != line;
+ if ((33 <= ch && ch <= 57) ||
+ (59 <= ch && ch <= 126))