libsparse: add sparse_file_len
Add sparse_file_len, which will compute the size of data that would
be produced if sparse_file_write was called. Useful combined with
sparse_file_callback.
Change-Id: I1a156d1071760f5559483954a5c62ffc20298703
diff --git a/libsparse/include/sparse/sparse.h b/libsparse/include/sparse/sparse.h
index fe003f6..17d085c 100644
--- a/libsparse/include/sparse/sparse.h
+++ b/libsparse/include/sparse/sparse.h
@@ -158,6 +158,20 @@
bool crc);
/**
+ * sparse_file_len - return the length of a sparse file if written to disk
+ *
+ * @s - sparse file cookie
+ * @sparse - write in the Android sparse file format
+ * @crc - append a crc chunk
+ *
+ * Returns the size a sparse file would be on disk if it were written in the
+ * specified format. If sparse is true, this is the size of the data in the
+ * sparse format. If sparse is false, this is the size of the normal
+ * non-sparse file.
+ */
+int64_t sparse_file_len(struct sparse_file *s, bool sparse, bool crc);
+
+/**
* sparse_file_callback - call a callback for blocks in sparse file
*
* @s - sparse file cookie
diff --git a/libsparse/sparse.c b/libsparse/sparse.c
index 77f02fc..f04f687 100644
--- a/libsparse/sparse.c
+++ b/libsparse/sparse.c
@@ -196,6 +196,30 @@
return 0;
}
+int64_t sparse_file_len(struct sparse_file *s, bool sparse, bool crc)
+{
+ int ret;
+ int chunks = sparse_count_chunks(s);
+ int64_t count = 0;
+ struct output_file *out;
+
+ out = open_output_callback(out_counter_write, &count,
+ s->block_size, s->len, false, sparse, chunks, crc);
+ if (!out) {
+ return -1;
+ }
+
+ ret = write_all_blocks(s, out);
+
+ close_output_file(out);
+
+ if (ret < 0) {
+ return -1;
+ }
+
+ return count;
+}
+
static struct backed_block *move_chunks_up_to_len(struct sparse_file *from,
struct sparse_file *to, unsigned int len)
{