libsparse patch to make make_ext4fs generated images work with the samsung galaxy tab A 7.0 (2016) SM-T285 and possibly other newer devices

gistfile1.txt

diff --git a/libsparse/output_file.c b/libsparse/output_file.c
index cd30800..da5b076 100644
--- a/libsparse/output_file.c
+++ b/libsparse/output_file.c
@@ -353,6 +353,7 @@ static int write_sparse_skip_chunk(struct output_file *out, int64_t skip_len)
 	chunk_header.reserved1 = 0;
 	chunk_header.chunk_sz = skip_len / out->block_size;
 	chunk_header.total_sz = CHUNK_HEADER_LEN;
+	chunk_header.samsung_magic = SAMSUNG_CHUNK_MAGIC;
 	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
 	if (ret < 0)
 		return -1;
@@ -378,6 +379,7 @@ static int write_sparse_fill_chunk(struct output_file *out, unsigned int len,
 	chunk_header.reserved1 = 0;
 	chunk_header.chunk_sz = rnd_up_len / out->block_size;
 	chunk_header.total_sz = CHUNK_HEADER_LEN + sizeof(fill_val);
+	chunk_header.samsung_magic = SAMSUNG_CHUNK_MAGIC;
 	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
 
 	if (ret < 0)
@@ -414,6 +416,7 @@ static int write_sparse_data_chunk(struct output_file *out, unsigned int len,
 	chunk_header.reserved1 = 0;
 	chunk_header.chunk_sz = rnd_up_len / out->block_size;
 	chunk_header.total_sz = CHUNK_HEADER_LEN + rnd_up_len;
+	chunk_header.samsung_magic = SAMSUNG_CHUNK_MAGIC;
 	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
 
 	if (ret < 0)
diff --git a/libsparse/sparse_format.h b/libsparse/sparse_format.h
index c41f12a..8d0f3e9 100644
--- a/libsparse/sparse_format.h
+++ b/libsparse/sparse_format.h
@@ -30,9 +30,11 @@ typedef struct sparse_header {
   __le32	image_checksum; /* CRC32 checksum of the original data, counting "don't care" */
 				/* as 0. Standard 802.3 polynomial, use a Public Domain */
 				/* table implementation */
+  __le32  samsung_reserved;
 } sparse_header_t;
 
 #define SPARSE_HEADER_MAGIC	0xed26ff3a
+#define SAMSUNG_CHUNK_MAGIC 0xf7776f58
 
 #define CHUNK_TYPE_RAW		0xCAC1
 #define CHUNK_TYPE_FILL		0xCAC2
@@ -44,6 +46,7 @@ typedef struct chunk_header {
   __le16	reserved1;
   __le32	chunk_sz;	/* in blocks in output image */
   __le32	total_sz;	/* in bytes of chunk input file including chunk header and data */
+  __le32  samsung_magic;
 } chunk_header_t;
 
 /* Following a Raw or Fill or CRC32 chunk is data.