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tools: Allow retrieval of signed data from mime-maker.

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* tools/mime-maker.c (find_part): New.
(mime_maker_get_part): New.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-09-29 17:38:06 +02:00
parent 29db3be6e8
commit f776757ea9
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 69 additions and 0 deletions
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67
tools/mime-maker.c
View File

@ -202,6 +202,22 @@ find_parent (part_t root, part_t needle)
return NULL;
}
/* Find the part node from the PARTID. */
static part_t
find_part (part_t root, unsigned int partid)
{
part_t node, n;
for (node = root->child; node; node = node->next)
{
if (node->partid == partid)
return root;
if ((n = find_part (node, partid)))
return n;
}
return NULL;
}
/* Create a boundary string. Outr codes is aware of the general
* structure of that string (gebins with "=-=") so that
@ -730,3 +746,54 @@ mime_maker_make (mime_maker_t ctx, estream_t fp)
ctx->outfp = NULL;
return err;
}
/* Create a stream object from the MIME part identified by PARTID and
* store it at R_STREAM. If PARTID identifies a container the entire
* tree is returned. Using that function may read stream objects
* which have been added as MIME bodies. The caller must close the
* stream object. */
gpg_error_t
mime_maker_get_part (mime_maker_t ctx, unsigned int partid, estream_t *r_stream)
{
gpg_error_t err;
part_t part;
estream_t fp;
*r_stream = NULL;
/* When the entire tree is requested, we make sure that all missing
* headers are applied. We don't do that if only a part is
* requested because the additional headers (like Date:) will only
* be added to part 0 headers anyway. */
if (!partid)
{
err = add_missing_headers (ctx);
if (err)
return err;
part = ctx->mail;
}
else
part = find_part (ctx->mail, partid);
/* For now we use a memory stream object; however it would also be
* possible to create an object created on the fly while the caller
* is reading the returned stream. */
fp = es_fopenmem (0, "w+b");
if (!fp)
return gpg_error_from_syserror ();
ctx->outfp = fp;
err = write_tree (ctx, NULL, part);
ctx->outfp = NULL;
if (!err)
{
es_rewind (fp);
*r_stream = fp;
}
else
es_fclose (fp);
return err;
}

2
tools/mime-maker.h
View File

@ -39,6 +39,8 @@ gpg_error_t mime_maker_end_container (mime_maker_t ctx);
unsigned int mime_maker_get_partid (mime_maker_t ctx);
gpg_error_t mime_maker_make (mime_maker_t ctx, estream_t fp);
gpg_error_t mime_maker_get_part (mime_maker_t ctx, unsigned int partid,
estream_t *r_stream);