[PATCH 2/8] split-index.c: dump "link" extension as json

[Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 json-writer.c | 14 ++++++++++++++
 json-writer.h |  2 ++
 split-index.c | 13 ++++++++++++-
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/json-writer.c b/json-writer.c
index 281bc50b39..70403580ca 100644
--- a/json-writer.c
+++ b/json-writer.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "ewah/ewok.h"
 #include "json-writer.h"
 
 void jw_init(struct json_writer *jw)
@@ -218,6 +219,19 @@ void jw_object_stat_data(struct json_writer *jw, const char *name,
 	jw_end(jw);
 }
 
+static void dump_ewah_one(size_t pos, void *jw)
+{
+	jw_array_intmax(jw, pos);
+}
+
+void jw_object_ewah(struct json_writer *jw, const char *key,
+		    struct ewah_bitmap *ewah)
+{
+	jw_object_inline_begin_array(jw, key);
+	ewah_each_bit(ewah, dump_ewah_one, jw);
+	jw_end(jw);
+}
+
 static void increase_indent(struct strbuf *sb,
 			    const struct json_writer *jw,
 			    int indent)
diff --git a/json-writer.h b/json-writer.h
index 38f9c9bf68..3c173647d3 100644
--- a/json-writer.h
+++ b/json-writer.h
@@ -85,6 +85,8 @@ void jw_object_bool(struct json_writer *jw, const char *key, int value);
 void jw_object_null(struct json_writer *jw, const char *key);
 void jw_object_stat_data(struct json_writer *jw, const char *key,
 			 const struct stat_data *sd);
+void jw_object_ewah(struct json_writer *jw, const char *key,
+		    struct ewah_bitmap *ewah);
 void jw_object_sub_jw(struct json_writer *jw, const char *key,
 		      const struct json_writer *value);
 
diff --git a/split-index.c b/split-index.c
index e6154e4ea9..d7b4420c92 100644
--- a/split-index.c
+++ b/split-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "json-writer.h"
 #include "split-index.h"
 #include "ewah/ewok.h"
 
@@ -16,6 +17,7 @@ int read_link_extension(struct index_state *istate,
 {
 	const unsigned char *data = data_;
 	struct split_index *si;
+	unsigned long original_sz = sz;
 	int ret;
 
 	if (sz < the_hash_algo->rawsz)
@@ -25,7 +27,7 @@ int read_link_extension(struct index_state *istate,
 	data += the_hash_algo->rawsz;
 	sz -= the_hash_algo->rawsz;
 	if (!sz)
-		return 0;
+		goto done;
 	si->delete_bitmap = ewah_new();
 	ret = ewah_read_mmap(si->delete_bitmap, data, sz);
 	if (ret < 0)
@@ -38,6 +40,15 @@ int read_link_extension(struct index_state *istate,
 		return error("corrupt replace bitmap in link extension");
 	if (ret != sz)
 		return error("garbage at the end of link extension");
+done:
+	if (istate->jw) {
+		jw_object_inline_begin_object(istate->jw, "split-index");
+		jw_object_string(istate->jw, "oid", oid_to_hex(&si->base_oid));
+		jw_object_ewah(istate->jw, "delete-bitmap", si->delete_bitmap);
+		jw_object_ewah(istate->jw, "replace-bitmap", si->replace_bitmap);
+		jw_object_intmax(istate->jw, "ext-size", original_sz);
+		jw_end(istate->jw);
+	}
 	return 0;
 }
 
-- 
2.22.0.rc0.322.g2b0371e29a