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Commit 317a09e2 authored by Colin Cross's avatar Colin Cross
Browse files

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
parent bdc6d39e

libsparse/include/sparse/sparse.h

+14 −0
Original line number Diff line number Diff line
@@ -157,6 +157,20 @@ int sparse_file_add_fd(struct sparse_file *s, 
int sparse_file_write(struct sparse_file *s, int fd, bool gz, bool sparse,

		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

 *

libsparse/sparse.c

+24 −0
Original line number Diff line number Diff line
@@ -196,6 +196,30 @@ static int out_counter_write(void *priv, const void *data, int len) 
	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)

{