1 files changed, 71 insertions, 0 deletions
diff --git a/src/lib-mail/rfc822-parser.h b/src/lib-mail/rfc822-parser.h
new file mode 100644
index 0000000..c001f76
--- /dev/null
+++ b/src/lib-mail/rfc822-parser.h
@@ -0,0 +1,71 @@
+#ifndef RFC822_PARSER_H
+#define RFC822_PARSER_H
+
+#include "unichar.h"
+
+/* This can be used as a common NUL replacement character */
+#define RFC822_NUL_REPLACEMENT_STR UNICODE_REPLACEMENT_CHAR_UTF8
+
+struct rfc822_parser_context {
+	const unsigned char *data, *end;
+	string_t *last_comment;
+
+	/* Replace NUL characters with this string */
+	const char *nul_replacement_str;
+};
+
+#define IS_ATEXT(c) \
+	(rfc822_atext_chars[(int)(unsigned char)(c)] != 0)
+#define IS_ATEXT_NON_TSPECIAL(c) \
+	((rfc822_atext_chars[(int)(unsigned char)(c)] & 3) != 0)
+extern unsigned char rfc822_atext_chars[256];
+
+/* Parse given data using RFC 822 token parser. */
+void rfc822_parser_init(struct rfc822_parser_context *ctx,
+			const unsigned char *data, size_t size,
+			string_t *last_comment) ATTR_NULL(4);
+static inline void rfc822_parser_deinit(struct rfc822_parser_context *ctx)
+{
+	/* make sure the parsing didn't trigger a bug that caused reading
+	   past the end pointer. */
+	i_assert(ctx->data <= ctx->end);
+	/* make sure the parser is no longer accessed */
+	ctx->data = ctx->end = NULL;
+}
+
+/* The functions below return 1 = more data available, 0 = no more data
+   available (but a value might have been returned now), -1 = invalid input.
+
+   LWSP is automatically skipped after value, but not before it. So typically
+   you begin with skipping LWSP and then start using the parse functions. */
+
+/* Parse comment. Assumes parser's data points to '(' */
+int rfc822_skip_comment(struct rfc822_parser_context *ctx);
+/* Skip LWSP if there is any */
+int ATTR_NOWARN_UNUSED_RESULT
+rfc822_skip_lwsp(struct rfc822_parser_context *ctx);
+/* Stop at next non-atext char */
+int rfc822_parse_atom(struct rfc822_parser_context *ctx, string_t *str);
+/* Like parse_atom() but don't stop at '.' */
+int rfc822_parse_dot_atom(struct rfc822_parser_context *ctx, string_t *str);
+/* Like parse_dot_atom() but stops for '/', '?' and '='.
+   Also it doesn't allow LWSP around '.' chars. */
+int rfc822_parse_mime_token(struct rfc822_parser_context *ctx, string_t *str);
+/* "quoted string" */
+int rfc822_parse_quoted_string(struct rfc822_parser_context *ctx,
+			       string_t *str);
+/* atom or quoted-string */
+int rfc822_parse_phrase(struct rfc822_parser_context *ctx, string_t *str);
+/* dot-atom / domain-literal */
+int rfc822_parse_domain(struct rfc822_parser_context *ctx, string_t *str);
+
+/* Parse Content-Type header's type/subtype. */
+int rfc822_parse_content_type(struct rfc822_parser_context *ctx, string_t *str);
+/* For Content-Type style parameter parsing. Expect ";" key "=" value.
+   value is unescaped if needed. The returned key is allocated from data
+   stack. The value string is truncated for each call. Returns 1 = key/value
+   set, 0 = no more data, -1 = invalid input. */
+int rfc822_parse_content_param(struct rfc822_parser_context *ctx,
+			       const char **key_r, string_t *value);
+
+#endif