This library is meant to be small and quick. It's based on WPACKET,
which was extended to support DER writing. The way it's used is a
bit unusual, as it's used to write the structures backward into a
given buffer. A typical quick call looks like this:
/*
* Fill in this structure:
*
* something ::= SEQUENCE {
* id OBJECT IDENTIFIER,
* x [0] INTEGER OPTIONAL,
* y [1] BOOLEAN OPTIONAL,
* n INTEGER
* }
*/
unsigned char buf[nnnn], *p = NULL;
size_t encoded_len = 0;
WPACKET pkt;
int ok;
ok = WPACKET_init_der(&pkt, buf, sizeof(buf)
&& DER_w_start_sequence(&pkt, -1)
&& DER_w_bn(&pkt, -1, bn)
&& DER_w_boolean(&pkt, 1, bool)
&& DER_w_precompiled(&pkt, -1, OID, sizeof(OID))
&& DER_w_end_sequence(&pkt, -1)
&& WPACKET_finish(&pkt)
&& WPACKET_get_total_written(&pkt, &encoded_len)
&& (p = WPACKET_get_curr(&pkt)) != NULL;
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11450)
Use case: having a variable with multiple source files in its value,
and wanting to refer to the corresponding object file.
$SRCS=foo.c bar.c
SOURCE[program]=$SRCS
DEPEND[${SRCS/.c/.o}]=prog.h
GENERATE[prog.h]=...
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11185)
So far, the "index" part of KEYWORD[whatever] could only handle one
item. There are cases, however, where we want to add the exact same
value to multiple items. This is especially helpful if a variable
that may have multi-item values are used in the "index" part.
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11185)
'VERSION' is a very easy file to parse, as opposed to a header file.
We also have the benefit of holding the version information in one
very well known place and can then generate all other version texts
as we see fit, for example opensslv.h.
Fixes#10203
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10205)
For files GENERATEd from templates (.in files), any perl module (.pm
file) that the file depends on will automatically be used.
This means that these two lines:
GENERATE[foo]=foo.in
DEPEND[foo]=whatever.pm
will emit this command in a Makefile (or corresponding):
foo: foo.in whatever.pm configdata.pm
$(PERL) -I. -Ipathto -Mwhatever -Mconfigdata $(SRCDIR)/util/dofile.pl \\
foo.in > foo
Note that configdata.pm is automatically added, since util/dofile.pl
itself depends on it.
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10162)
