* src/parsetlv.c (_gpgme_parse_tlv): Detect integer overflow.
--
Although there is no concrete case where we use for example
(to.nhdr+ti.length), it feels safer to protect against this anyway.
* src/gpgme.h.in (gpgme_data_type_t): New.
(gpgme_data_identify): New prototype.
* src/data-identify.c: New.
* src/parsetlv.c, src/parsetlv.h: New. Take from gpa.
* src/libgpgme.vers, src/gpgme.def: Add gpgme_data_identify.
* src/gpgme-tool.c (status): Add STATUS_IDENTIFY_RESULT.
(gt_identify): New.
(cmd_identify): New.
(hlp_passwd): Move close to cmd_passwd.
--
It is often useful to have a way to identify the data which needs
processing. This is such a common task that it makes sense to
implement this in gpgme to avoid diverging implementations.
