[PATCH 1/2] mime-node: rename decrypted_child to unwrapped_child

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

When walking the MIME tree, we might need to extract a new MIME
object.  Thus far, we've only done it when decrypting
multipart/encrypted messages, but PKCS#7 (RFC 8551, S/MIME) has
several other transformations that warrant a comparable form of
unwrapping.

Make this member re-usable for PKCS#7 unwrappings as well as
multipart/encrypted decryptions.

This change is just a naming change, it has no effect on function.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
---
 mime-node.c      | 10 +++++-----
 notmuch-client.h |  6 ++++--
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/mime-node.c b/mime-node.c
index e531078c..2a823dfd 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -227,19 +227,19 @@ node_decrypt_and_verify (mime_node_t *node, GMimeObject *part)
     GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part);
     notmuch_message_t *message = NULL;
 
-    if (! node->decrypted_child) {
+    if (! node->unwrapped_child) {
 	for (mime_node_t *parent = node; parent; parent = parent->parent)
 	    if (parent->envelope_file) {
 		message = parent->envelope_file;
 		break;
 	    }
 
-	node->decrypted_child = _notmuch_crypto_decrypt (&node->decrypt_attempted,
+	node->unwrapped_child = _notmuch_crypto_decrypt (&node->decrypt_attempted,
 							 node->ctx->crypto->decrypt,
 							 message,
 							 encrypteddata, &decrypt_result, &err);
     }
-    if (! node->decrypted_child) {
+    if (! node->unwrapped_child) {
 	fprintf (stderr, "Failed to decrypt part: %s\n",
 		 err ? err->message : "no error explanation given");
 	goto DONE;
@@ -380,8 +380,8 @@ mime_node_child (mime_node_t *parent, int child)
 	return NULL;
 
     if (GMIME_IS_MULTIPART (parent->part)) {
-	if (child == GMIME_MULTIPART_ENCRYPTED_CONTENT && parent->decrypted_child)
-	    sub = parent->decrypted_child;
+	if (child == GMIME_MULTIPART_ENCRYPTED_CONTENT && parent->unwrapped_child)
+	    sub = parent->unwrapped_child;
 	else
 	    sub = g_mime_multipart_get_part (
 		GMIME_MULTIPART (parent->part), child);
diff --git a/notmuch-client.h b/notmuch-client.h
index 74690054..89e15ba6 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -395,8 +395,10 @@ struct mime_node {
     struct mime_node_context *ctx;
 
     /* Internal: For successfully decrypted multipart parts, the
-     * decrypted part to substitute for the second child. */
-    GMimeObject *decrypted_child;
+     * decrypted part to substitute for the second child; or, for
+     * PKCS#7 parts, the part returned after removing/processing the
+     * PKCS#7 transformation */
+    GMimeObject *unwrapped_child;
 
     /* Internal: The next child for depth-first traversal and the part
      * number to assign it (or -1 if unknown). */
-- 
2.25.1