struct wim_lookup_table_entry;
struct read_stream_list_callbacks;
+struct apply_operations;
+struct wim_dentry;
struct apply_ctx {
/* The WIMStruct from which files are being extracted from the currently
struct wim_features supported_features;
/* The members below should not be used outside of extract.c */
+ const struct apply_operations *apply_ops;
u64 next_progress;
unsigned long invalid_sequence;
unsigned long num_streams_remaining;
extern int
do_file_extract_progress(struct apply_ctx *ctx, enum wimlib_progress_msg msg);
+#define COUNT_PER_FILE_PROGRESS 256
+
static inline int
maybe_do_file_progress(struct apply_ctx *ctx, enum wimlib_progress_msg msg)
{
+ ctx->progress.extract.current_file_count++;
if (unlikely(!--ctx->count_until_file_progress))
return do_file_extract_progress(ctx, msg);
return 0;
}
-/* Call this to reset the counter for report_file_created() and
- * report_file_metadata_applied(). */
-static inline void
-reset_file_progress(struct apply_ctx *ctx)
-{
- ctx->count_until_file_progress = 1;
-}
+extern int
+start_file_structure_phase(struct apply_ctx *ctx, uint64_t end_file_count);
+
+extern int
+start_file_metadata_phase(struct apply_ctx *ctx, uint64_t end_file_count);
/* Report that a file was created, prior to stream extraction. */
static inline int
return maybe_do_file_progress(ctx, WIMLIB_PROGRESS_MSG_EXTRACT_METADATA);
}
+extern int
+end_file_structure_phase(struct apply_ctx *ctx);
+
+extern int
+end_file_metadata_phase(struct apply_ctx *ctx);
+
+static inline int
+report_apply_error(struct apply_ctx *ctx, int error_code, const tchar *path)
+{
+ return report_error(ctx->progfunc, ctx->progctx, error_code, path);
+}
+
/* Returns any of the aliases of an inode that are being extracted. */
#define inode_first_extraction_dentry(inode) \
list_first_entry(&(inode)->i_extraction_aliases, \
extract_stream_list(struct apply_ctx *ctx,
const struct read_stream_list_callbacks *cbs);
+/*
+ * Represents an extraction backend.
+ */
struct apply_operations {
+
+ /* Name of the extraction backend. */
const char *name;
+
+ /*
+ * Query the features supported by the extraction backend.
+ *
+ * @target
+ * The target string that was provided by the user. (Often a
+ * directory, but extraction backends are free to interpret this
+ * differently.)
+ *
+ * @supported_features
+ * A structure, each of whose members represents a feature that may
+ * be supported by the extraction backend. For each feature that
+ * the extraction backend supports, this routine must set the
+ * corresponding member to a nonzero value.
+ *
+ * Return 0 if successful; otherwise a positive wimlib error code.
+ */
int (*get_supported_features)(const tchar *target,
struct wim_features *supported_features);
+ /*
+ * Main extraction routine.
+ *
+ * The extraction backend is provided a list of dentries that have been
+ * prepared for extraction. It is free to extract them in any way that
+ * it chooses. Ideally, it should choose a method that maximizes
+ * performance.
+ *
+ * The target string will be provided in ctx->common.target. This might
+ * be a directory, although extraction backends are free to interpret it
+ * as they wish. TODO: in some cases, the common extraction code also
+ * interprets the target string. This should be completely isolated to
+ * extraction backends.
+ *
+ * The extraction flags will be provided in ctx->common.extract_flags.
+ * Extraction backends should examine them and implement the behaviors
+ * for as many flags as possible. Some flags are already handled by the
+ * common extraction code. TODO: this needs to be better formalized.
+ *
+ * @dentry_list, the list of dentries, will be ordered such that the
+ * ancestor of any dentry always precedes any descendents. Unless
+ * @single_tree_only is set, it's possible that the dentries consist of
+ * multiple disconnected trees.
+ *
+ * 'd_extraction_name' and 'd_extraction_name_nchars' of each dentry
+ * will be set to indicate the actual name with which the dentry should
+ * be extracted. This may or may not be the same as 'file_name'.
+ * TODO: really, the extraction backends should be responsible for
+ * generating 'd_extraction_name'.
+ *
+ * Each dentry will refer to a valid inode in 'd_inode'.
+ * 'd_inode->i_extraction_aliases' will contain a list of just the
+ * dentries of that inode being extracted. This will be a (possibly
+ * nonproper) subset of the 'd_inode->i_dentry' list.
+ *
+ * The streams required to be extracted will already be prepared in
+ * 'apply_ctx'. The extraction backend should call
+ * extract_stream_list() to extract them.
+ *
+ * The will_extract_dentry() utility function, given an arbitrary dentry
+ * in the WIM image (which may not be in the extraction list), can be
+ * used to determine if that dentry is in the extraction list.
+ *
+ * Return 0 if successful; otherwise a positive wimlib error code.
+ */
int (*extract)(struct list_head *dentry_list, struct apply_ctx *ctx);
+ /*
+ * Query whether the unnamed data stream of the specified file will be
+ * extracted as "externally backed". If so, the extraction backend is
+ * assumed to handle this separately, and the common extraction code
+ * will not register a usage of that stream.
+ *
+ * This routine is optional.
+ *
+ * Return:
+ * < 0 if the file will *not* be externally backed.
+ * = 0 if the file will be externally backed.
+ * > 0 (wimlib error code) if another error occurred.
+ */
+ int (*will_externally_back)(struct wim_dentry *dentry, struct apply_ctx *ctx);
+
+ /*
+ * Size of the backend-specific extraction context. It must contain
+ * 'struct apply_ctx' as its first member.
+ */
size_t context_size;
+
+ /*
+ * Set this if the extraction backend only supports extracting dentries
+ * that form a single tree, not multiple trees.
+ */
bool single_tree_only;
};
git://wimlib.net / wimlib / blobdiff