#ifndef _WIMLIB_RESOURCE_H
#define _WIMLIB_RESOURCE_H
-#include "wimlib/types.h"
#include "wimlib/callback.h"
+#include "wimlib/list.h"
+#include "wimlib/sha1.h"
+#include "wimlib/types.h"
-struct wim_lookup_table_entry;
+struct blob_descriptor;
+struct filedes;
struct wim_image_metadata;
-/* Metadata for a resource in a WIM file. */
-struct resource_entry {
- /* Size, in bytes, of the resource in the WIM file. */
- u64 size : 56;
+/*
+ * Description of a "resource" in a WIM file. A "resource" is a standalone,
+ * possibly compressed region of data. Normally, there is a one-to-one
+ * correspondence between "blobs" (each of which may be the contents of a file,
+ * for example) and resources. However, a resource with the
+ * WIM_RESHDR_FLAG_SOLID flag set is a "solid" resource that contains multiple
+ * blobs compressed together.
+ */
+struct wim_resource_descriptor {
+ /* 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;
- /* Bitwise or of one or more of the WIM_RESHDR_FLAG_* flags. */
- u64 flags : 8;
+ /* 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, including overhead such as the chunk
+ * table. */
+ u64 size_in_wim;
+
+ /* The number of bytes of uncompressed data this resource decompresses
+ * to. */
+ u64 uncompressed_size;
+
+ /* The list of blobs this resource contains. */
+ struct list_head blob_list;
+
+ /* Flags for this resource (WIM_RESHDR_FLAG_*). */
+ u32 flags : 8;
+
+ /* [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;
- /* Offset, in bytes, of the resource in the WIM file. */
- u64 offset;
+ /* Temporary flag. */
+ u32 raw_copy_ok : 1;
- /* Uncompressed size of the resource in the WIM file. Is the same as
- * @size if the resource is uncompressed. */
- u64 original_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;
};
-struct resource_entry_disk {
- u8 size[7];
+/* 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];
+
+ /* Zero or more of the WIM_RESHDR_FLAG_* flags. These indicate, for
+ * example, whether the resource is compressed or not. */
u8 flags;
- le64 offset;
- le64 original_size;
+
+ /* Offset of the resource from the start of the WIM file, in bytes. */
+ le64 offset_in_wim;
+
+ /* Uncompressed size of the resource, in bytes. */
+ le64 uncompressed_size;
} _packed_attribute;
-/* Flags for the `flags' field of the struct resource_entry structure. */
+/* In-memory version of a WIM resource header (`struct wim_reshdr_disk'). */
+struct wim_reshdr {
+ u64 size_in_wim : 56;
+ u64 flags : 8;
+ u64 offset_in_wim;
+ u64 uncompressed_size;
+};
+
+/* 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, we don't
- * actually use this flag for anything. */
+/* Unknown meaning; currently ignored by wimlib. */
#define WIM_RESHDR_FLAG_FREE 0x01
-/* Indicates that the stream is a metadata resource for a WIM image. */
+/* The resource is a metadata resource for a WIM image, or is the blob table or
+ * XML data for the WIM. */
#define WIM_RESHDR_FLAG_METADATA 0x02
-/* Indicates that the stream is compressed. */
+/* The resource is a non-solid resource compressed using the WIM's default
+ * compression type. */
#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, we don't actually use this flag for anything. */
+/* Unknown meaning; currently ignored by wimlib. */
#define WIM_RESHDR_FLAG_SPANNED 0x08
-/* Nonzero if a struct resource_entry indicates a compressed resource. */
-static inline int
-resource_is_compressed(const struct resource_entry *entry)
+/* The resource is a solid compressed resource which may contain multiple blobs.
+ * This flag is only allowed if the WIM version number is WIM_VERSION_SOLID. */
+#define WIM_RESHDR_FLAG_SOLID 0x10
+
+/* Magic number in the 'uncompressed_size' field of the resource header that
+ * identifies the main entry for a solid resource. */
+#define SOLID_RESOURCE_MAGIC_NUMBER 0x100000000ULL
+
+/* Returns true if the specified WIM resource is compressed (may be either solid
+ * or non-solid) */
+static inline bool
+resource_is_compressed(const struct wim_resource_descriptor *rdesc)
{
- return (entry->flags & WIM_RESHDR_FLAG_COMPRESSED);
+ return (rdesc->flags & (WIM_RESHDR_FLAG_COMPRESSED |
+ WIM_RESHDR_FLAG_SOLID));
}
-#if 1
-# define copy_resource_entry(dst, src) memcpy(dst, src, sizeof(struct resource_entry))
-# define zero_resource_entry(entry) memset(entry, 0, sizeof(struct resource_entry))
-#else
static inline void
-copy_resource_entry(struct resource_entry *dst,
- const struct resource_entry *src)
+copy_reshdr(struct wim_reshdr *dest, const struct wim_reshdr *src)
{
- BUILD_BUG_ON(sizeof(struct resource_entry) != 24);
- ((u64*)dst)[0] = ((u64*)src)[0];
- ((u64*)dst)[1] = ((u64*)src)[1];
- ((u64*)dst)[2] = ((u64*)src)[2];
+ memcpy(dest, src, sizeof(struct wim_reshdr));
}
static inline void
-zero_resource_entry(struct resource_entry *entry)
+zero_reshdr(struct wim_reshdr *reshdr)
+{
+ memset(reshdr, 0, sizeof(struct wim_reshdr));
+}
+
+extern void
+wim_res_hdr_to_desc(const struct wim_reshdr *reshdr, WIMStruct *wim,
+ struct wim_resource_descriptor *rdesc);
+
+extern void
+get_wim_reshdr(const struct wim_reshdr_disk *disk_reshdr,
+ struct wim_reshdr *reshdr);
+
+void
+put_wim_reshdr(const struct wim_reshdr *reshdr,
+ struct wim_reshdr_disk *disk_reshdr);
+
+/* Alternate chunk table format for resources with WIM_RESHDR_FLAG_SOLID 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;
+
+static inline unsigned int
+get_chunk_entry_size(u64 res_size, bool is_alt)
{
- BUILD_BUG_ON(sizeof(struct resource_entry) != 24);
- ((u64*)entry)[0] = 0;
- ((u64*)entry)[1] = 0;
- ((u64*)entry)[2] = 0;
+ if (res_size <= UINT32_MAX || is_alt)
+ return 4;
+ else
+ return 8;
}
-#endif
-#define WIMLIB_RESOURCE_FLAG_RAW 0x1
-#define WIMLIB_RESOURCE_FLAG_RECOMPRESS 0x2
+/* Functions to read blobs */
extern int
-read_resource_prefix(const struct wim_lookup_table_entry *lte,
- u64 size, consume_data_callback_t cb, void *ctx_or_buf,
- int flags);
+read_partial_wim_blob_into_buf(const struct blob_descriptor *blob,
+ size_t size, u64 offset, void *buf);
-extern void
-get_resource_entry(const struct resource_entry_disk *disk_entry,
- struct resource_entry *entry);
+extern int
+read_full_blob_into_buf(const struct blob_descriptor *blob, void *buf);
-extern void
-put_resource_entry(const struct resource_entry *entry,
- struct resource_entry_disk *disk_entry);
+extern int
+read_full_blob_into_alloc_buf(const struct blob_descriptor *blob, void **buf_ret);
extern int
-read_partial_wim_resource_into_buf(const struct wim_lookup_table_entry *lte,
- size_t size, u64 offset, void *buf);
+wim_reshdr_to_data(const struct wim_reshdr *reshdr,
+ WIMStruct *wim, void **buf_ret);
+
extern int
-read_full_resource_into_buf(const struct wim_lookup_table_entry *lte, void *buf);
+wim_reshdr_to_hash(const struct wim_reshdr *reshdr, WIMStruct *wim,
+ u8 hash[SHA1_HASH_SIZE]);
extern int
-write_wim_resource(struct wim_lookup_table_entry *lte, int out_fd,
- int out_ctype, struct resource_entry *out_res_entry,
- int flags);
+skip_wim_resource(struct wim_resource_descriptor *rdesc);
+
+/*
+ * Type of callback function for beginning to read a blob.
+ *
+ * @blob:
+ * Blob 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_BLOB_STATUS_SKIP_BLOB to indicate that the blob should not be
+ * read, and read_blob_list() should continue on to the next blob (without
+ * calling @consume_chunk or @end_blob).
+ */
+typedef int (*read_blob_list_begin_blob_t)(struct blob_descriptor *blob, void *ctx);
+
+#define BEGIN_BLOB_STATUS_SKIP_BLOB -1
+
+/*
+ * Type of callback function for finishing reading a blob.
+ *
+ * @blob:
+ * Blob that has been fully read, or blob that started being read but could
+ * not be fully read due to a read error.
+ *
+ * @status:
+ * 0 if reading the blob was successful; otherwise a nonzero error code
+ * that specifies the return status.
+ *
+ * @ctx:
+ * User-provided context.
+ */
+typedef int (*read_blob_list_end_blob_t)(struct blob_descriptor *blob,
+ int status,
+ void *ctx);
+
+
+/* Callback functions and contexts for read_blob_list(). */
+struct read_blob_list_callbacks {
+
+ /* Called when a blob is about to be read. */
+ read_blob_list_begin_blob_t begin_blob;
+
+ /* Called when a chunk of data has been read. */
+ consume_data_callback_t consume_chunk;
+
+ /* Called when a blob has been fully read. A successful call to
+ * @begin_blob will always be matched by a call to @end_blob. */
+ read_blob_list_end_blob_t end_blob;
+
+ /* Parameter passed to @begin_blob. */
+ void *begin_blob_ctx;
+
+ /* Parameter passed to @consume_chunk. */
+ void *consume_chunk_ctx;
+
+ /* Parameter passed to @end_blob. */
+ void *end_blob_ctx;
+};
+
+/* Flags for read_blob_list() */
+#define VERIFY_BLOB_HASHES 0x1
+#define COMPUTE_MISSING_BLOB_HASHES 0x2
+#define BLOB_LIST_ALREADY_SORTED 0x4
extern int
-extract_wim_resource(const struct wim_lookup_table_entry *lte,
- u64 size,
- consume_data_callback_t extract_chunk,
- void *extract_chunk_arg);
+read_blob_list(struct list_head *blob_list, size_t list_head_offset,
+ const struct read_blob_list_callbacks *cbs, int flags);
+
+/* Functions to extract blobs. */
extern int
-extract_wim_resource_to_fd(const struct wim_lookup_table_entry *lte,
- int fd, u64 size);
+extract_blob(struct blob_descriptor *blob, u64 size,
+ consume_data_callback_t extract_chunk, void *extract_chunk_arg);
extern int
-sha1_resource(struct wim_lookup_table_entry *lte);
+extract_blob_to_fd(struct blob_descriptor *blob, struct filedes *fd, u64 size);
+
+extern int
+extract_full_blob_to_fd(struct blob_descriptor *blob, struct filedes *fd);
+
+/* Miscellaneous blob functions. */
extern int
-copy_resource(struct wim_lookup_table_entry *lte, void *w);
+sha1_blob(struct blob_descriptor *blob);
+
+/* Functions to read/write metadata resources. */
extern int
-read_metadata_resource(WIMStruct *w,
- struct wim_image_metadata *image_metadata);
+read_metadata_resource(struct wim_image_metadata *imd);
extern int
-write_metadata_resource(WIMStruct *w);
+write_metadata_resource(WIMStruct *wim, int image, int write_resource_flags);
+
+/* Definitions specific to pipable WIM resources. */
+
+/* Arbitrary number to begin each blob in the pipable WIM, used for sanity
+ * checking. */
+#define PWM_BLOB_MAGIC 0x2b9b9ba2443db9d8ULL
+
+/* Header that precedes each blob in a pipable WIM. */
+struct pwm_blob_hdr {
+ le64 magic; /* +0 */
+ le64 uncompressed_size; /* +8 */
+ u8 hash[SHA1_HASH_SIZE]; /* +16 */
+ le32 flags; /* +36 */
+ /* +40 */
+} _packed_attribute;
+
+/* Header that precedes each chunk of a compressed resource in a pipable WIM.
+ */
+struct pwm_chunk_hdr {
+ le32 compressed_size;
+} _packed_attribute;
#endif /* _WIMLIB_RESOURCE_H */
git://wimlib.net / wimlib / blobdiff