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libsparse: add sparse_file_len

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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
This commit is contained in:
Colin Cross 2012-05-24 17:15:43 -07:00
parent bdc6d39ed6
commit 317a09e2d4
2 changed files with 38 additions and 0 deletions
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14
libsparse/include/sparse/sparse.h
View file

@ -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
*

24
libsparse/sparse.c
View file

@ -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)
{