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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-08 14:53:30 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-08 14:53:30 +0200
commit3a851dfe87c88ac1d4dddc2a26cc48b037f852f9 (patch)
treea8a8f34291aa58b25737088d247a91a7f60b4fec /lib/sqfs/xattr_reader.c
parent60064dd0412a149fe00cfc4e2f2361c22656db57 (diff)
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>
Diffstat (limited to 'lib/sqfs/xattr_reader.c')
-rw-r--r--lib/sqfs/xattr_reader.c35
1 files changed, 18 insertions, 17 deletions
diff --git a/lib/sqfs/xattr_reader.c b/lib/sqfs/xattr_reader.c
index 80731ba..1634be8 100644
--- a/lib/sqfs/xattr_reader.c
+++ b/lib/sqfs/xattr_reader.c
@@ -12,6 +12,7 @@
#include "sqfs/xattr.h"
#include "sqfs/error.h"
#include "sqfs/data.h"
+#include "sqfs/io.h"
#include "util.h"
#include <stdlib.h>
@@ -29,7 +30,7 @@ struct sqfs_xattr_reader_t {
sqfs_meta_reader_t *idrd;
sqfs_meta_reader_t *kvrd;
sqfs_super_t *super;
- int sqfsfd;
+ sqfs_file_t *file;
};
int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr)
@@ -47,11 +48,10 @@ int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr)
if (xr->super->xattr_id_table_start >= xr->super->bytes_used)
return SQFS_ERROR_OUT_OF_BOUNDS;
- if (read_data_at("reading xattr ID location table",
- xr->super->xattr_id_table_start,
- xr->sqfsfd, &idtbl, sizeof(idtbl))) {
- return SQFS_ERROR_IO;
- }
+ err = xr->file->read_at(xr->file, xr->super->xattr_id_table_start,
+ &idtbl, sizeof(idtbl));
+ if (err)
+ return err;
xr->xattr_start = le64toh(idtbl.xattr_table_start);
xr->num_ids = le32toh(idtbl.xattr_ids);
@@ -68,13 +68,12 @@ int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr)
return SQFS_ERROR_ALLOC;
}
- if (read_data_at("reading xattr ID block locations",
- xr->super->xattr_id_table_start + sizeof(idtbl),
- xr->sqfsfd, xr->id_block_starts,
- sizeof(uint64_t) * xr->num_id_blocks)) {
- err = SQFS_ERROR_IO;
+ err = xr->file->read_at(xr->file,
+ xr->super->xattr_id_table_start + sizeof(idtbl),
+ xr->id_block_starts,
+ sizeof(uint64_t) * xr->num_id_blocks);
+ if (err)
goto fail;
- }
for (i = 0; i < xr->num_id_blocks; ++i) {
xr->id_block_starts[i] = le64toh(xr->id_block_starts[i]);
@@ -254,7 +253,8 @@ void sqfs_xattr_reader_destroy(sqfs_xattr_reader_t *xr)
free(xr);
}
-sqfs_xattr_reader_t *sqfs_xattr_reader_create(int sqfsfd, sqfs_super_t *super,
+sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_file_t *file,
+ sqfs_super_t *super,
sqfs_compressor_t *cmp)
{
sqfs_xattr_reader_t *xr = calloc(1, sizeof(*xr));
@@ -262,26 +262,27 @@ sqfs_xattr_reader_t *sqfs_xattr_reader_create(int sqfsfd, sqfs_super_t *super,
if (xr == NULL)
return NULL;
+ xr->file = file;
+ xr->super = super;
+
if (super->flags & SQFS_FLAG_NO_XATTRS)
return xr;
if (super->xattr_id_table_start == 0xFFFFFFFFFFFFFFFF)
return xr;
- xr->idrd = sqfs_meta_reader_create(sqfsfd, cmp,
+ xr->idrd = sqfs_meta_reader_create(file, cmp,
super->id_table_start,
super->bytes_used);
if (xr->idrd == NULL)
goto fail;
- xr->kvrd = sqfs_meta_reader_create(sqfsfd, cmp,
+ xr->kvrd = sqfs_meta_reader_create(file, cmp,
super->id_table_start,
super->bytes_used);
if (xr->kvrd == NULL)
goto fail;
- xr->sqfsfd = sqfsfd;
- xr->super = super;
return xr;
fail:
sqfs_xattr_reader_destroy(xr);