Replace direct file I/O with abstraction layer

This should make it easier to use libsquashfs with custom setups that
embedd a squashfs image inside something else. Also, it should make
it easier to port to non unix-like platforms.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 3 insertions, 11 deletions

diff --git a/lib/sqfs/super.c b/lib/sqfs/super.c
index 0489079..b3984d2 100644
--- a/lib/sqfs/super.c
+++ b/lib/sqfs/super.c
@@ -9,6 +9,7 @@
 
 #include "sqfs/super.h"
 #include "sqfs/error.h"
+#include "sqfs/io.h"
 #include "util.h"
 
 #include <endian.h>
@@ -48,7 +49,7 @@ int sqfs_super_init(sqfs_super_t *super, size_t block_size, uint32_t mtime,
 	return 0;
 }
 
-int sqfs_super_write(sqfs_super_t *super, int fd)
+int sqfs_super_write(sqfs_super_t *super, sqfs_file_t *file)
 {
 	sqfs_super_t copy;
 
@@ -72,14 +73,5 @@ int sqfs_super_write(sqfs_super_t *super, int fd)
 	copy.fragment_table_start = htole64(super->fragment_table_start);
 	copy.export_table_start = htole64(super->export_table_start);
 
-	if (lseek(fd, 0, SEEK_SET) == (off_t)-1)
-		return SQFS_ERROR_IO;
-
-	if (write_data("writing super block", fd, &copy, sizeof(copy)))
-		return SQFS_ERROR_IO;
-
-	if (lseek(fd, 0, SEEK_END) == (off_t)-1)
-		return SQFS_ERROR_IO;
-
-	return 0;
+	return file->write_at(file, 0, &copy, sizeof(copy));
 }