pop3-migration: Avoid unnecessarily using stream's hdr_size.

Shouldn't change any behavior, except reduce CPU usage a little bit.

src/plugins/pop3-migration/pop3-migration-plugin.c

@@ -173,25 +173,21 @@ pop3_header_filter_callback(struct header_filter_istream *input ATTR_UNUSED,
 }
 
 int pop3_migration_get_hdr_sha1(uint32_t mail_seq, struct istream *input,
-				uoff_t hdr_size,
 				unsigned char sha1_r[STATIC_ARRAY SHA1_RESULTLEN],
 				bool *have_eoh_r)
 {
-	struct istream *input2;
 	const unsigned char *data;
 	size_t size;
 	struct sha1_ctxt sha1_ctx;
 	struct pop3_hdr_context hdr_ctx;
 
 	memset(&hdr_ctx, 0, sizeof(hdr_ctx));
-	input2 = i_stream_create_limit(input, hdr_size);
 	/* hide headers that might change or be different in IMAP vs. POP3 */
-	input = i_stream_create_header_filter(input2,
+	input = i_stream_create_header_filter(input, HEADER_FILTER_HIDE_BODY |
 				HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR,
 				hdr_hash_skip_headers,
 				N_ELEMENTS(hdr_hash_skip_headers),
 				pop3_header_filter_callback, &hdr_ctx);
-	i_stream_unref(&input2);
 
 	sha1_init(&sha1_ctx);
 	while (i_stream_read_more(input, &data, &size) > 0) {
@@ -231,21 +227,18 @@ static int
 get_hdr_sha1(struct mail *mail, unsigned char sha1_r[STATIC_ARRAY SHA1_RESULTLEN])
 {
 	struct istream *input;
-	struct message_size hdr_size;
 	const char *errstr;
 	enum mail_error error;
 	bool have_eoh;
 	int ret;
 
-	if (mail_get_hdr_stream(mail, &hdr_size, &input) < 0) {
+	if (mail_get_hdr_stream(mail, NULL, &input) < 0) {
 		errstr = mailbox_get_last_error(mail->box, &error);
 		i_error("pop3_migration: Failed to get header for msg %u: %s",
 			mail->seq, errstr);
 		return error == MAIL_ERROR_EXPUNGED ? 0 : -1;
 	}
-	if (pop3_migration_get_hdr_sha1(mail->seq, input,
-					hdr_size.physical_size,
-					sha1_r, &have_eoh) < 0)
+	if (pop3_migration_get_hdr_sha1(mail->seq, input, sha1_r, &have_eoh) < 0)
 		return -1;
 	if (have_eoh) {
 		struct index_mail *imail = (struct index_mail *)mail;
@@ -274,15 +267,13 @@ get_hdr_sha1(struct mail *mail, unsigned char sha1_r[STATIC_ARRAY SHA1_RESULTLEN
 	   So we'll try to avoid this by falling back to full FETCH BODY[]
 	   (and/or RETR) and we'll parse the header ourself from it. This
 	   should work around any similar bugs in all IMAP/POP3 servers. */
-	if (mail_get_stream_because(mail, &hdr_size, NULL, "pop3-migration", &input) < 0) {
+	if (mail_get_stream_because(mail, NULL, NULL, "pop3-migration", &input) < 0) {
 		errstr = mailbox_get_last_error(mail->box, &error);
 		i_error("pop3_migration: Failed to get body for msg %u: %s",
 			mail->seq, errstr);
 		return error == MAIL_ERROR_EXPUNGED ? 0 : -1;
 	}
-	ret = pop3_migration_get_hdr_sha1(mail->seq, input,
-					  hdr_size.physical_size,
-					  sha1_r, &have_eoh);
+	ret = pop3_migration_get_hdr_sha1(mail->seq, input, sha1_r, &have_eoh);
 	if (ret == 0) {
 		if (!have_eoh)
 			i_warning("pop3_migration: Truncated email with UID %u stored as truncated", mail->uid);

src/plugins/pop3-migration/pop3-migration-plugin.h

@@ -7,7 +7,6 @@ void pop3_migration_plugin_init(struct module *module);
 void pop3_migration_plugin_deinit(void);
 
 int pop3_migration_get_hdr_sha1(uint32_t mail_seq, struct istream *input,
-				uoff_t hdr_size,
 				unsigned char sha1_r[STATIC_ARRAY SHA1_RESULTLEN],
 				bool *have_eoh_r);
 

src/plugins/pop3-migration/test-pop3-migration-plugin.c

@@ -31,8 +31,7 @@ static void test_pop3_migration_get_hdr_sha1(void)
 	for (i = 0; i < N_ELEMENTS(tests); i++) {
 		input = i_stream_create_from_data(tests[i].input,
 						  strlen(tests[i].input));
-		test_assert_idx(pop3_migration_get_hdr_sha1(1, input, strlen(tests[i].input),
-							    digest, &have_eoh) == 0, i);
+		test_assert_idx(pop3_migration_get_hdr_sha1(1, input, digest, &have_eoh) == 0, i);
 		test_assert_idx(strcasecmp(binary_to_hex(digest, sizeof(digest)), tests[i].sha1) == 0, i);
 		test_assert_idx(tests[i].have_eoh == have_eoh, i);
 		i_stream_unref(&input);