#ifndef _WIMLIB_RESOURCE_H
#define _WIMLIB_RESOURCE_H
-#include "wimlib/types.h"
-#include "wimlib/endianness.h"
#include "wimlib/callback.h"
-#include "wimlib/file_io.h"
#include "wimlib/list.h"
#include "wimlib/sha1.h"
+#include "wimlib/types.h"
+struct filedes;
struct wim_lookup_table_entry;
struct wim_image_metadata;
* an instance of this structure.
*
* Normally, there is a one-to-one correspondence between WIM lookup table
- * entries ("streams") and WIM resources. However, the flag
- * WIM_RESHDR_FLAG_CONCAT can be used to specify that two streams be combined
- * into the same resource and compressed together. Caveats about this flag are
- * noted in the comment above the definition of WIM_VERSION_STREAM_CONCAT. */
+ * entries ("streams", each of which may be the contents of a file, for example)
+ * and WIM resources. However, WIM resources with the
+ * WIM_RESHDR_FLAG_PACKED_STREAMS flag set may actually contain multiple streams
+ * compressed together. */
struct wim_resource_spec {
- /* The WIM file containing this resource. */
+ /* The WIM containing this resource. @wim->in_fd is expected to be a
+ * file descriptor to the underlying WIM file, opened for reading. */
WIMStruct *wim;
- /* Offset, in bytes, from the start of WIM file at which this resource
- * starts. */
+ /* The offset, in bytes, from the start of WIM file at which this
+ * resource starts. */
u64 offset_in_wim;
/* The size of this resource in the WIM file. For compressed resources
- * this is the compressed size. */
+ * this is the compressed size, including overhead such as the chunk
+ * table. */
u64 size_in_wim;
- /* Number of bytes of uncompressed data this resource uncompresses to.
- */
+ /* The number of bytes of uncompressed data this resource decompresses
+ * to. */
u64 uncompressed_size;
- /* List of streams this resource contains. */
- struct list_head lte_list;
+ /* The list of streams this resource contains. */
+ struct list_head stream_list;
- /* Resource flags. */
+ /* Flags for this resource (WIM_RESHDR_FLAG_*). */
u32 flags : 8;
- /* This flag will be set if the WIM is pipable and therefore the
- * resource will be in a slightly different format if it is compressed
- * (wimlib extension). */
+ /* [wimlib extension] This flag will be set if the WIM is pipable. In
+ * such cases, the resource will be in a slightly different format if it
+ * is compressed. */
u32 is_pipable : 1;
- /* Compression type of this resource as one of WIMLIB_COMPRESSION_TYPE_*
- * constants. */
- u32 ctype : 3;
+ /* Temporary flag. */
+ u32 raw_copy_ok : 1;
- /* Compression chunk size. */
- u32 cchunk_size;
-};
+ /* Compression type of this resource. */
+ u32 compression_type : 22;
+ /* Compression chunk size of this resource. Irrelevant if the resource
+ * is uncompressed. */
+ u32 chunk_size;
+};
-/* On-disk version of a WIM resource header: This structure specifies the
- * location, size, and flags (e.g. compressed or not compressed) for a resource
- * in the WIM file. */
+/* On-disk version of a WIM resource header. */
struct wim_reshdr_disk {
/* Size of the resource as it appears in the WIM file (possibly
* compressed). */
u8 size_in_wim[7];
- /* WIM_RESHDR_FLAG_* flags. */
+ /* Zero or more of the WIM_RESHDR_FLAG_* flags. These indicate, for
+ * example, whether the resource is compressed or not. */
u8 flags;
- /* Offset of the resource from the start of the WIM file. */
+ /* Offset of the resource from the start of the WIM file, in bytes. */
le64 offset_in_wim;
- /* Uncompressed size of the resource. */
+ /* Uncompressed size of the resource, in bytes. */
le64 uncompressed_size;
} _packed_attribute;
-/* In-memory version of wim_reshdr_disk. */
+/* In-memory version of a WIM resource header (`struct wim_reshdr_disk'). */
struct wim_reshdr {
u64 size_in_wim : 56;
u64 flags : 8;
u64 uncompressed_size;
};
-/* Flags for the `flags' field of the struct resource_entry structure. */
+/* Flags for the `flags' field of WIM resource headers (`struct wim_reshdr').
+ */
-/* I haven't seen this flag used in any of the WIMs I have examined. I assume
- * it means that there are no references to the stream, so the space is free.
- * However, even after deleting files from a WIM mounted with `imagex.exe
- * /mountrw', I could not see this flag being used. Either way, wimlib doesn't
- * actually use this flag for anything. */
+/* Unknown meaning; may be intended to indicate spaces in the WIM that are free
+ * to overwrite. Currently ignored by wimlib. */
#define WIM_RESHDR_FLAG_FREE 0x01
-/* Indicates that the stream is a metadata resource for a WIM image. This flag
- * is also set in the resource entry for the lookup table in the WIM header. */
+/* The resource is a metadata resource for a WIM image, or is the lookup table
+ * or XML data for the WIM. */
#define WIM_RESHDR_FLAG_METADATA 0x02
-/* Indicates that the stream is compressed (using the WIM's set compression
- * type). */
+/* The resource is compressed using the WIM's default compression type and uses
+ * the regular chunk table format. */
#define WIM_RESHDR_FLAG_COMPRESSED 0x04
-/* I haven't seen this flag used in any of the WIMs I have examined. Perhaps it
- * means that a stream could possibly be split among multiple split WIM parts.
- * However, `imagex.exe /split' does not seem to create any WIMs like this.
- * Either way, wimlib doesn't actually use this flag for anything. */
+/* Unknown meaning; may be intended to indicate a partial stream. Currently
+ * ignored by wimlib. */
#define WIM_RESHDR_FLAG_SPANNED 0x08
-/* TODO */
-#define WIM_RESHDR_FLAG_CONCAT 0x10
+/* The resource is packed in a special format that may contain multiple
+ * underlying streams, or this resource entry represents a stream packed into
+ * one such resource. When resources have this flag set, the WIM version number
+ * should be WIM_VERSION_PACKED_STREAMS. */
+#define WIM_RESHDR_FLAG_PACKED_STREAMS 0x10
+
+/* Magic number in the 'uncompressed_size' field of the resource header that
+ * identifies the main entry for a pack. */
+#define WIM_PACK_MAGIC_NUMBER 0x100000000ULL
+
+/* Returns true if the specified WIM resource is compressed, using either the
+ * original chunk table layout or the alternate layout for resources that may
+ * contain multiple packed streams. */
+static inline bool
+resource_is_compressed(const struct wim_resource_spec *rspec)
+{
+ return (rspec->flags & (WIM_RESHDR_FLAG_COMPRESSED |
+ WIM_RESHDR_FLAG_PACKED_STREAMS));
+}
static inline void
copy_reshdr(struct wim_reshdr *dest, const struct wim_reshdr *src)
memset(reshdr, 0, sizeof(struct wim_reshdr));
}
-
extern void
wim_res_hdr_to_spec(const struct wim_reshdr *reshdr, WIMStruct *wim,
struct wim_resource_spec *rspec);
wim_res_spec_to_hdr(const struct wim_resource_spec *rspec,
struct wim_reshdr *reshdr);
-extern int
+extern void
get_wim_reshdr(const struct wim_reshdr_disk *disk_reshdr,
struct wim_reshdr *reshdr);
put_wim_reshdr(const struct wim_reshdr *reshdr,
struct wim_reshdr_disk *disk_reshdr);
-/* wimlib internal flags used when reading or writing resources. */
-#define WIMLIB_WRITE_RESOURCE_FLAG_RECOMPRESS 0x00000001
-#define WIMLIB_WRITE_RESOURCE_FLAG_PIPABLE 0x00000002
-#define WIMLIB_WRITE_RESOURCE_MASK 0x0000ffff
-
-#define WIMLIB_READ_RESOURCE_FLAG_RAW_FULL 0x80000000
-#define WIMLIB_READ_RESOURCE_FLAG_RAW_CHUNKS 0x40000000
-#define WIMLIB_READ_RESOURCE_FLAG_RAW (WIMLIB_READ_RESOURCE_FLAG_RAW_FULL | \
- WIMLIB_READ_RESOURCE_FLAG_RAW_CHUNKS)
-#define WIMLIB_READ_RESOURCE_MASK 0xffff0000
-
+/* Alternate chunk table format for resources with
+ * WIM_RESHDR_FLAG_PACKED_STREAMS set. */
+struct alt_chunk_table_header_disk {
+ /* Uncompressed size of the resource in bytes. */
+ le64 res_usize;
+
+ /* Number of bytes each compressed chunk decompresses into, except
+ * possibly the last which decompresses into the remainder. This
+ * overrides the chunk size specified by the WIM header. */
+ le32 chunk_size;
+
+ /* Compression format used for compressed chunks:
+ * 0 = None
+ * 1 = XPRESS
+ * 2 = LZX
+ * 3 = LZMS
+ *
+ * This overrides the compression type specified by the WIM header. */
+ le32 compression_format;
+
+ /* This header is directly followed by a table of compressed sizes of
+ * the chunks (4 bytes per entry). */
+} _packed_attribute;
-/* Functions to read a resource. */
+static inline unsigned int
+get_chunk_entry_size(u64 res_size, bool is_alt)
+{
+ if (res_size <= UINT32_MAX || is_alt)
+ return 4;
+ else
+ return 8;
+}
-extern int
-read_partial_wim_resource(const struct wim_lookup_table_entry *lte,
- u64 size, consume_data_callback_t cb,
- u32 in_chunk_size, void *ctx_or_buf,
- int flags, u64 offset);
+/* Functions to read streams */
extern int
read_partial_wim_stream_into_buf(const struct wim_lookup_table_entry *lte,
size_t size, u64 offset, void *buf);
+
extern int
read_full_stream_into_buf(const struct wim_lookup_table_entry *lte, void *buf);
WIMStruct *wim, void **buf_ret);
extern int
-read_stream_prefix(const struct wim_lookup_table_entry *lte,
- u64 size, consume_data_callback_t cb,
- u32 in_chunk_size, void *ctx_or_buf, int flags);
+wim_reshdr_to_hash(const struct wim_reshdr *reshdr, WIMStruct *wim,
+ u8 hash[SHA1_HASH_SIZE]);
-/* Functions to extract a resource. */
+extern int
+skip_wim_stream(struct wim_lookup_table_entry *lte);
+
+/*
+ * Type of callback function for beginning to read a stream.
+ *
+ * @lte:
+ * Stream that is about to be read.
+ *
+ * @ctx:
+ * User-provided context.
+ *
+ * Must return 0 on success, a positive error code on failure, or the special
+ * value BEGIN_STREAM_STATUS_SKIP_STREAM to indicate that the stream should not
+ * be read, and read_stream_list() should continue on to the next stream
+ * (without calling @consume_chunk or @end_stream).
+ */
+typedef int (*read_stream_list_begin_stream_t)(struct wim_lookup_table_entry *lte,
+ void *ctx);
+
+#define BEGIN_STREAM_STATUS_SKIP_STREAM -1
+
+/*
+ * Type of callback function for finishing reading a stream.
+ *
+ * @lte:
+ * Stream that has been fully read, or stream that started being read but
+ * could not be fully read due to a read error.
+ *
+ * @status:
+ * 0 if reading the stream was successful; otherwise a nonzero error code
+ * that specifies the return status.
+ *
+ * @ctx:
+ * User-provided context.
+ */
+typedef int (*read_stream_list_end_stream_t)(struct wim_lookup_table_entry *lte,
+ int status,
+ void *ctx);
+
+
+/* Callback functions and contexts for read_stream_list(). */
+struct read_stream_list_callbacks {
+
+ /* Called when a stream is about to be read. */
+ read_stream_list_begin_stream_t begin_stream;
+
+ /* Called when a chunk of data has been read. */
+ consume_data_callback_t consume_chunk;
+
+ /* Called when a stream has been fully read. A successful call to
+ * @begin_stream will always be matched by a call to @end_stream. */
+ read_stream_list_end_stream_t end_stream;
+
+ /* Parameter passed to @begin_stream. */
+ void *begin_stream_ctx;
+
+ /* Parameter passed to @consume_chunk. */
+ void *consume_chunk_ctx;
+
+ /* Parameter passed to @end_stream. */
+ void *end_stream_ctx;
+};
+
+/* Flags for read_stream_list() */
+#define VERIFY_STREAM_HASHES 0x1
+#define COMPUTE_MISSING_STREAM_HASHES 0x2
+#define STREAM_LIST_ALREADY_SORTED 0x4
extern int
-extract_stream(const struct wim_lookup_table_entry *lte,
+read_stream_list(struct list_head *stream_list,
+ size_t list_head_offset,
+ const struct read_stream_list_callbacks *cbs,
+ int flags);
+
+/* Functions to extract streams. */
+
+extern int
+extract_stream(struct wim_lookup_table_entry *lte,
u64 size,
consume_data_callback_t extract_chunk,
void *extract_chunk_arg);
extern int
-extract_stream_to_fd(const struct wim_lookup_table_entry *lte,
+extract_stream_to_fd(struct wim_lookup_table_entry *lte,
struct filedes *fd, u64 size);
-/* Miscellaneous resource functions. */
+extern int
+extract_full_stream_to_fd(struct wim_lookup_table_entry *lte,
+ struct filedes *fd);
+
+/* Miscellaneous stream functions. */
extern int
sha1_stream(struct wim_lookup_table_entry *lte);
/* Functions to read/write metadata resources. */
extern int
-read_metadata_resource(WIMStruct *wim,
- struct wim_image_metadata *image_metadata);
+read_metadata_resource(struct wim_image_metadata *imd);
extern int
write_metadata_resource(WIMStruct *wim, int image, int write_resource_flags);
le32 compressed_size;
} _packed_attribute;
-
#endif /* _WIMLIB_RESOURCE_H */
git://wimlib.net / wimlib / blobdiff