diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
index 5352ee65bd1..9e6ed6b65e2 100644
--- a/builtin/interpret-trailers.c
+++ b/builtin/interpret-trailers.c
@@ -141,7 +141,7 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 	LIST_HEAD(head);
 	struct strbuf sb = STRBUF_INIT;
 	struct strbuf trailer_block = STRBUF_INIT;
-	struct trailer_info info;
+	struct trailer_info *info;
 	FILE *outfile = stdout;
 
 	trailer_config_init();
@@ -151,13 +151,13 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 	if (opts->in_place)
 		outfile = create_in_place_tempfile(file);
 
-	parse_trailers(opts, &info, sb.buf, &head);
+	info = parse_trailers(opts, sb.buf, &head);
 
 	/* Print the lines before the trailers */
 	if (!opts->only_trailers)
-		fwrite(sb.buf, 1, info.trailer_block_start, outfile);
+		fwrite(sb.buf, 1, trailer_block_start(info), outfile);
 
-	if (!opts->only_trailers && !info.blank_line_before_trailer)
+	if (!opts->only_trailers && !blank_line_before_trailer_block(info))
 		fprintf(outfile, "\n");
 
 
@@ -176,11 +176,12 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 	strbuf_release(&trailer_block);
 
 	free_trailers(&head);
-	trailer_info_release(&info);
 
 	/* Print the lines after the trailers as is */
 	if (!opts->only_trailers)
-		fwrite(sb.buf + info.trailer_block_end, 1, sb.len - info.trailer_block_end, outfile);
+		fwrite(sb.buf + trailer_block_end(info), 1, sb.len - trailer_block_end(info), outfile);
+
+	trailer_info_release(info);
 
 	if (opts->in_place)
 		if (rename_tempfile(&trailers_tempfile, file))
diff --git a/trailer.c b/trailer.c
index 5bcc9b0006c..63774cd068d 100644
--- a/trailer.c
+++ b/trailer.c
@@ -11,6 +11,27 @@
  * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
  */
 
+struct trailer_info {
+	/*
+	 * True if there is a blank line before the location pointed to by
+	 * trailer_block_start.
+	 */
+	int blank_line_before_trailer;
+
+	/*
+	 * Offsets to the trailer block start and end positions in the input
+	 * string. If no trailer block is found, these are both set to the
+	 * "true" end of the input (find_end_of_log_message()).
+	 */
+	size_t trailer_block_start, trailer_block_end;
+
+	/*
+	 * Array of trailers found.
+	 */
+	char **trailers;
+	size_t trailer_nr;
+};
+
 struct conf_info {
 	char *name;
 	char *key;
@@ -1025,20 +1046,72 @@ void format_trailers(const struct process_trailer_options *opts,
 	}
 }
 
+static struct trailer_info *trailer_info_new(void)
+{
+	struct trailer_info *info = xcalloc(1, sizeof(*info));
+	return info;
+}
+
+static struct trailer_info *trailer_info_get(const struct process_trailer_options *opts,
+					     const char *str)
+{
+	struct trailer_info *info = trailer_info_new();
+	size_t end_of_log_message = 0, trailer_block_start = 0;
+	struct strbuf **trailer_lines, **ptr;
+	char **trailer_strings = NULL;
+	size_t nr = 0, alloc = 0;
+	char **last = NULL;
+
+	trailer_config_init();
+
+	end_of_log_message = find_end_of_log_message(str, opts->no_divider);
+	trailer_block_start = find_trailer_block_start(str, end_of_log_message);
+
+	trailer_lines = strbuf_split_buf(str + trailer_block_start,
+					 end_of_log_message - trailer_block_start,
+					 '\n',
+					 0);
+	for (ptr = trailer_lines; *ptr; ptr++) {
+		if (last && isspace((*ptr)->buf[0])) {
+			struct strbuf sb = STRBUF_INIT;
+			strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
+			strbuf_addbuf(&sb, *ptr);
+			*last = strbuf_detach(&sb, NULL);
+			continue;
+		}
+		ALLOC_GROW(trailer_strings, nr + 1, alloc);
+		trailer_strings[nr] = strbuf_detach(*ptr, NULL);
+		last = find_separator(trailer_strings[nr], separators) >= 1
+			? &trailer_strings[nr]
+			: NULL;
+		nr++;
+	}
+	strbuf_list_free(trailer_lines);
+
+	info->blank_line_before_trailer = ends_with_blank_line(str,
+							       trailer_block_start);
+	info->trailer_block_start = trailer_block_start;
+	info->trailer_block_end = end_of_log_message;
+	info->trailers = trailer_strings;
+	info->trailer_nr = nr;
+
+	return info;
+}
+
 /*
  * Parse trailers in "str", populating the trailer info and "head"
  * linked list structure.
  */
-void parse_trailers(const struct process_trailer_options *opts,
-		    struct trailer_info *info,
-		    const char *str,
-		    struct list_head *head)
+struct trailer_info *parse_trailers(const struct process_trailer_options *opts,
+				    const char *str,
+				    struct list_head *head)
 {
+	struct trailer_info *info;
 	struct strbuf tok = STRBUF_INIT;
 	struct strbuf val = STRBUF_INIT;
 	size_t i;
 
-	trailer_info_get(info, str, opts);
+	info = trailer_info_get(opts, str);
 
 	for (i = 0; i < info->trailer_nr; i++) {
 		int separator_pos;
@@ -1062,6 +1135,8 @@ void parse_trailers(const struct process_trailer_options *opts,
 					 strbuf_detach(&val, NULL));
 		}
 	}
+
+	return info;
 }
 
 void free_trailers(struct list_head *trailers)
@@ -1073,47 +1148,19 @@ void free_trailers(struct list_head *trailers)
 	}
 }
 
-void trailer_info_get(struct trailer_info *info, const char *str,
-		      const struct process_trailer_options *opts)
+size_t trailer_block_start(struct trailer_info *info)
 {
-	size_t end_of_log_message = 0, trailer_block_start = 0;
-	struct strbuf **trailer_lines, **ptr;
-	char **trailer_strings = NULL;
-	size_t nr = 0, alloc = 0;
-	char **last = NULL;
-
-	trailer_config_init();
-
-	end_of_log_message = find_end_of_log_message(str, opts->no_divider);
-	trailer_block_start = find_trailer_block_start(str, end_of_log_message);
+	return info->trailer_block_start;
+}
 
-	trailer_lines = strbuf_split_buf(str + trailer_block_start,
-					 end_of_log_message - trailer_block_start,
-					 '\n',
-					 0);
-	for (ptr = trailer_lines; *ptr; ptr++) {
-		if (last && isspace((*ptr)->buf[0])) {
-			struct strbuf sb = STRBUF_INIT;
-			strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
-			strbuf_addbuf(&sb, *ptr);
-			*last = strbuf_detach(&sb, NULL);
-			continue;
-		}
-		ALLOC_GROW(trailer_strings, nr + 1, alloc);
-		trailer_strings[nr] = strbuf_detach(*ptr, NULL);
-		last = find_separator(trailer_strings[nr], separators) >= 1
-			? &trailer_strings[nr]
-			: NULL;
-		nr++;
-	}
-	strbuf_list_free(trailer_lines);
+size_t trailer_block_end(struct trailer_info *info)
+{
+	return info->trailer_block_end;
+}
 
-	info->blank_line_before_trailer = ends_with_blank_line(str,
-							       trailer_block_start);
-	info->trailer_block_start = trailer_block_start;
-	info->trailer_block_end = end_of_log_message;
-	info->trailers = trailer_strings;
-	info->trailer_nr = nr;
+int blank_line_before_trailer_block(struct trailer_info *info)
+{
+	return info->blank_line_before_trailer;
 }
 
 void trailer_info_release(struct trailer_info *info)
@@ -1122,6 +1169,7 @@ void trailer_info_release(struct trailer_info *info)
 	for (i = 0; i < info->trailer_nr; i++)
 		free(info->trailers[i]);
 	free(info->trailers);
+	free(info);
 }
 
 void format_trailers_from_commit(const struct process_trailer_options *opts,
@@ -1129,30 +1177,30 @@ void format_trailers_from_commit(const struct process_trailer_options *opts,
 				 struct strbuf *out)
 {
 	LIST_HEAD(head);
-	struct trailer_info info;
-
-	parse_trailers(opts, &info, msg, &head);
+	struct trailer_info *info = parse_trailers(opts, msg, &head);
 
 	/* If we want the whole block untouched, we can take the fast path. */
 	if (!opts->only_trailers && !opts->unfold && !opts->filter &&
 	    !opts->separator && !opts->key_only && !opts->value_only &&
 	    !opts->key_value_separator) {
-		strbuf_add(out, msg + info.trailer_block_start,
-			   info.trailer_block_end - info.trailer_block_start);
+		strbuf_add(out, msg + info->trailer_block_start,
+			   info->trailer_block_end - info->trailer_block_start);
 	} else
 		format_trailers(opts, &head, out);
 
 	free_trailers(&head);
-	trailer_info_release(&info);
+	trailer_info_release(info);
 }
 
 void trailer_iterator_init(struct trailer_iterator *iter, const char *msg)
 {
 	struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
+	struct trailer_info *internal = trailer_info_new();
 	strbuf_init(&iter->key, 0);
 	strbuf_init(&iter->val, 0);
 	opts.no_divider = 1;
-	trailer_info_get(&iter->internal.info, msg, &opts);
+	iter->internal.info = internal;
+	iter->internal.info = trailer_info_get(&opts, msg);
 	iter->internal.cur = 0;
 }
 
@@ -1160,8 +1208,8 @@ int trailer_iterator_advance(struct trailer_iterator *iter)
 {
 	char *line;
 	int separator_pos;
-	if (iter->internal.cur < iter->internal.info.trailer_nr) {
-		line = iter->internal.info.trailers[iter->internal.cur++];
+	if (iter->internal.cur < iter->internal.info->trailer_nr) {
+		line = iter->internal.info->trailers[iter->internal.cur++];
 		separator_pos = find_separator(line, separators);
 		iter->is_trailer = (separator_pos > 0);
 
@@ -1178,7 +1226,7 @@ int trailer_iterator_advance(struct trailer_iterator *iter)
 
 void trailer_iterator_release(struct trailer_iterator *iter)
 {
-	trailer_info_release(&iter->internal.info);
+	trailer_info_release(iter->internal.info);
 	strbuf_release(&iter->val);
 	strbuf_release(&iter->key);
 }
diff --git a/trailer.h b/trailer.h
index a7599067acc..e19ddf84e64 100644
--- a/trailer.h
+++ b/trailer.h
@@ -4,6 +4,8 @@
 #include "list.h"
 #include "strbuf.h"
 
+struct trailer_info;
+
 enum trailer_where {
 	WHERE_DEFAULT,
 	WHERE_END,
@@ -29,27 +31,6 @@ int trailer_set_where(enum trailer_where *item, const char *value);
 int trailer_set_if_exists(enum trailer_if_exists *item, const char *value);
 int trailer_set_if_missing(enum trailer_if_missing *item, const char *value);
 
-struct trailer_info {
-	/*
-	 * True if there is a blank line before the location pointed to by
-	 * trailer_block_start.
-	 */
-	int blank_line_before_trailer;
-
-	/*
-	 * Offsets to the trailer block start and end positions in the input
-	 * string. If no trailer block is found, these are both set to the
-	 * "true" end of the input (find_end_of_log_message()).
-	 */
-	size_t trailer_block_start, trailer_block_end;
-
-	/*
-	 * Array of trailers found.
-	 */
-	char **trailers;
-	size_t trailer_nr;
-};
-
 /*
  * A list that represents newly-added trailers, such as those provided
  * with the --trailer command line option of git-interpret-trailers.
@@ -89,13 +70,13 @@ void parse_trailers_from_command_line_args(struct list_head *arg_head,
 void process_trailers_lists(struct list_head *head,
 			    struct list_head *arg_head);
 
-void parse_trailers(const struct process_trailer_options *opts,
-		    struct trailer_info *info,
-		    const char *str,
-		    struct list_head *head);
+struct trailer_info *parse_trailers(const struct process_trailer_options *opts,
+				    const char *str,
+				    struct list_head *head);
 
-void trailer_info_get(struct trailer_info *info, const char *str,
-		      const struct process_trailer_options *opts);
+size_t trailer_block_start(struct trailer_info *info);
+size_t trailer_block_end(struct trailer_info *info);
+int blank_line_before_trailer_block(struct trailer_info *info);
 
 void trailer_info_release(struct trailer_info *info);
 
@@ -142,7 +123,7 @@ struct trailer_iterator {
 
 	/* private */
 	struct {
-		struct trailer_info info;
+		struct trailer_info *info;
 		size_t cur;
 	} internal;
 };
