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-rw-r--r--include/sqfs/xattr_reader.h21
-rw-r--r--lib/sqfs/xattr_reader.c98
-rw-r--r--tar/sqfs2tar.c4
-rw-r--r--unpack/rdsquashfs.c4
4 files changed, 69 insertions, 58 deletions
diff --git a/include/sqfs/xattr_reader.h b/include/sqfs/xattr_reader.h
index 7912de4..54ffc12 100644
--- a/include/sqfs/xattr_reader.h
+++ b/include/sqfs/xattr_reader.h
@@ -83,18 +83,12 @@ extern "C" {
* Do not destroy any of the pointed to objects before destroying the xattr
* reader.
*
- * @param file A pointer to a file object that contains the SquashFS filesystem
- * @param super A pointer to the SquashFS super block required to find the
- * location tables.
- * @param cmp A pointer to a compressor used to uncompress the loaded meta data
- * blocks.
+ * @param flags Currently must be set to 0, or creation will fail.
*
* @return A pointer to a new xattr reader instance on success, NULL on
* allocation failure.
*/
-SQFS_API sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_file_t *file,
- sqfs_super_t *super,
- sqfs_compressor_t *cmp);
+SQFS_API sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_u32 flags);
/**
* @brief Load the locations of the xattr meta data blocks into memory
@@ -104,9 +98,18 @@ SQFS_API sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_file_t *file,
* This function must be called explicitly after an xattr reader has been
* created to load the actual location table from disk.
*
+ * @param xr A pointer to an xattr reader instance.
+ * @param super A pointer to the SquashFS super block required to find the
+ * location tables.
+ * @param file A pointer to a file object that contains the SquashFS filesystem.
+ * @param cmp A pointer to a compressor used to uncompress the loaded meta data
+ * blocks.
+ *
* @return Zero on success, a negative @ref E_SQFS_ERROR value on failure.
*/
-SQFS_API int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr);
+SQFS_API int sqfs_xattr_reader_load(sqfs_xattr_reader_t *xr,
+ const sqfs_super_t *super,
+ sqfs_file_t *file, sqfs_compressor_t *cmp);
/**
* @brief Resolve an xattr index from an inode to an xattr description
diff --git a/lib/sqfs/xattr_reader.c b/lib/sqfs/xattr_reader.c
index 1469a90..bad160d 100644
--- a/lib/sqfs/xattr_reader.c
+++ b/lib/sqfs/xattr_reader.c
@@ -24,6 +24,7 @@ struct sqfs_xattr_reader_t {
sqfs_object_t base;
sqfs_u64 xattr_start;
+ sqfs_u64 xattr_end;
size_t num_id_blocks;
size_t num_ids;
@@ -32,8 +33,6 @@ struct sqfs_xattr_reader_t {
sqfs_meta_reader_t *idrd;
sqfs_meta_reader_t *kvrd;
- sqfs_super_t *super;
- sqfs_file_t *file;
};
static sqfs_object_t *xattr_reader_copy(const sqfs_object_t *obj)
@@ -94,23 +93,40 @@ static void xattr_reader_destroy(sqfs_object_t *obj)
free(xr);
}
-int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr)
+int sqfs_xattr_reader_load(sqfs_xattr_reader_t *xr, const sqfs_super_t *super,
+ sqfs_file_t *file, sqfs_compressor_t *cmp)
{
sqfs_xattr_id_table_t idtbl;
size_t i;
int err;
- if (xr->super->flags & SQFS_FLAG_NO_XATTRS)
+ /* sanity check */
+ if (super->flags & SQFS_FLAG_NO_XATTRS)
return 0;
- if (xr->super->xattr_id_table_start == 0xFFFFFFFFFFFFFFFF)
+ if (super->xattr_id_table_start == 0xFFFFFFFFFFFFFFFF)
return 0;
- if (xr->super->xattr_id_table_start >= xr->super->bytes_used)
+ if (super->xattr_id_table_start >= super->bytes_used)
return SQFS_ERROR_OUT_OF_BOUNDS;
- err = xr->file->read_at(xr->file, xr->super->xattr_id_table_start,
- &idtbl, sizeof(idtbl));
+ /* cleanup pre-existing data */
+ if (xr->idrd != NULL) {
+ sqfs_destroy(xr->idrd);
+ xr->idrd = NULL;
+ }
+
+ if (xr->kvrd != NULL) {
+ sqfs_destroy(xr->idrd);
+ xr->idrd = NULL;
+ }
+
+ free(xr->id_block_starts);
+ xr->id_block_starts = NULL;
+
+ /* read the locations table */
+ err = file->read_at(file, super->xattr_id_table_start,
+ &idtbl, sizeof(idtbl));
if (err)
return err;
@@ -129,24 +145,38 @@ int sqfs_xattr_reader_load_locations(sqfs_xattr_reader_t *xr)
return SQFS_ERROR_ALLOC;
}
- err = xr->file->read_at(xr->file,
- xr->super->xattr_id_table_start + sizeof(idtbl),
- xr->id_block_starts,
- sizeof(sqfs_u64) * xr->num_id_blocks);
+ err = file->read_at(file, super->xattr_id_table_start + sizeof(idtbl),
+ xr->id_block_starts,
+ sizeof(sqfs_u64) * xr->num_id_blocks);
if (err)
- goto fail;
+ goto fail_blocks;
for (i = 0; i < xr->num_id_blocks; ++i) {
xr->id_block_starts[i] = le64toh(xr->id_block_starts[i]);
- if (xr->id_block_starts[i] > xr->super->bytes_used) {
+ if (xr->id_block_starts[i] > super->bytes_used) {
err = SQFS_ERROR_OUT_OF_BOUNDS;
- goto fail;
+ goto fail_blocks;
}
}
+ /* create the meta data readers */
+ xr->idrd = sqfs_meta_reader_create(file, cmp, super->id_table_start,
+ super->bytes_used);
+ if (xr->idrd == NULL)
+ goto fail_blocks;
+
+ xr->kvrd = sqfs_meta_reader_create(file, cmp, super->id_table_start,
+ super->bytes_used);
+ if (xr->kvrd == NULL)
+ goto fail_idrd;
+
+ xr->xattr_end = super->bytes_used;
return 0;
-fail:
+fail_idrd:
+ sqfs_destroy(xr->idrd);
+ xr->idrd = NULL;
+fail_blocks:
free(xr->id_block_starts);
xr->id_block_starts = NULL;
return err;
@@ -216,7 +246,7 @@ int sqfs_xattr_reader_read_value(sqfs_xattr_reader_t *xr,
sqfs_meta_reader_get_position(xr->kvrd, &start, &offset);
new_start = xr->xattr_start + (ref >> 16);
- if (new_start >= xr->super->bytes_used)
+ if (new_start >= xr->xattr_end)
return SQFS_ERROR_OUT_OF_BOUNDS;
new_offset = ref & 0xFFFF;
@@ -302,40 +332,18 @@ int sqfs_xattr_reader_get_desc(sqfs_xattr_reader_t *xr, sqfs_u32 idx,
return 0;
}
-sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_file_t *file,
- sqfs_super_t *super,
- sqfs_compressor_t *cmp)
+sqfs_xattr_reader_t *sqfs_xattr_reader_create(sqfs_u32 flags)
{
- sqfs_xattr_reader_t *xr = calloc(1, sizeof(*xr));
+ sqfs_xattr_reader_t *xr;
+
+ if (flags != 0)
+ return NULL;
+ xr = calloc(1, sizeof(*xr));
if (xr == NULL)
return NULL;
((sqfs_object_t *)xr)->copy = xattr_reader_copy;
((sqfs_object_t *)xr)->destroy = xattr_reader_destroy;
- 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(file, cmp,
- super->id_table_start,
- super->bytes_used);
- if (xr->idrd == NULL)
- goto fail;
-
- xr->kvrd = sqfs_meta_reader_create(file, cmp,
- super->id_table_start,
- super->bytes_used);
- if (xr->kvrd == NULL)
- goto fail;
-
return xr;
-fail:
- sqfs_destroy(xr);
- return NULL;
}
diff --git a/tar/sqfs2tar.c b/tar/sqfs2tar.c
index 5a786dd..2e4d0ef 100644
--- a/tar/sqfs2tar.c
+++ b/tar/sqfs2tar.c
@@ -611,14 +611,14 @@ int main(int argc, char **argv)
}
if (!no_xattr && !(super.flags & SQFS_FLAG_NO_XATTRS)) {
- xr = sqfs_xattr_reader_create(file, &super, cmp);
+ xr = sqfs_xattr_reader_create(0);
if (xr == NULL) {
sqfs_perror(filename, "creating xattr reader",
SQFS_ERROR_ALLOC);
goto out_dr;
}
- ret = sqfs_xattr_reader_load_locations(xr);
+ ret = sqfs_xattr_reader_load(xr, &super, file, cmp);
if (ret) {
sqfs_perror(filename, "loading xattr table", ret);
goto out_xr;
diff --git a/unpack/rdsquashfs.c b/unpack/rdsquashfs.c
index 99e51fb..7b3bddf 100644
--- a/unpack/rdsquashfs.c
+++ b/unpack/rdsquashfs.c
@@ -74,14 +74,14 @@ int main(int argc, char **argv)
}
if (!(super.flags & SQFS_FLAG_NO_XATTRS)) {
- xattr = sqfs_xattr_reader_create(file, &super, cmp);
+ xattr = sqfs_xattr_reader_create(0);
if (xattr == NULL) {
sqfs_perror(opt.image_name, "creating xattr reader",
SQFS_ERROR_ALLOC);
goto out_cmp;
}
- ret = sqfs_xattr_reader_load_locations(xattr);
+ ret = sqfs_xattr_reader_load(xattr, &super, file, cmp);
if (ret) {
sqfs_perror(opt.image_name, "loading xattr table",
ret);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 23:02:47 +0000