Add helper to decode percent-plus encoded strings

* src/conversion.c (do_decode_percent_or_percent_plus): New.
(_gpgme_decode_percent_string): Move its code to new file-static
do_decode_percent_or_percent_plus and call it with disabled decoding of
'+'.
* src/conversion.c, src/util.h (_gpgme_decode_percent_plus_string): New.
--

GnuPG-bug-id: 8369

1 files changed, 10 insertions, 0 deletions

diff --git a/src/util.h b/src/util.h
index d805373a..b7462ea5 100644
--- a/src/util.h
+++ b/src/util.h
@@ -131,6 +131,16 @@ gpgme_error_t _gpgme_decode_c_string (const char *src, char **destp,
 gpgme_error_t _gpgme_decode_percent_string (const char *src, char **destp,
 					    size_t len, int binary);
 
+/* Decode the percent-plus escaped string SRC and store the result in the
+   buffer *DESTP which is LEN bytes long.  If LEN is zero, then a
+   large enough buffer is allocated with malloc and *DESTP is set to
+   the result.  Currently, LEN is only used to specify if allocation
+   is desired or not, the caller is expected to make sure that *DESTP
+   is large enough if LEN is not zero.  If BINARY is 1, then '\0'
+   characters are allowed in the output.  */
+gpgme_error_t _gpgme_decode_percent_plus_string (const char *src, char **destp,
+					         size_t len, int binary);
+
 gpgme_error_t _gpgme_encode_percent_string (const char *src, char **destp,
 					    size_t len);