/* Length of the WIM header on disk. */
#define WIM_HEADER_DISK_SIZE 208
-/* Version of the WIM file. There is an older version (used for prerelease
- * versions of Windows Vista), but wimlib doesn't support it. The differences
- * between the versions are undocumented. */
+/* Default WIM version number. Streams are always compressed independently. */
#define WIM_VERSION_DEFAULT 0x10d00
-/* Version number used for a different WIM format, which as of Windows 8 can be
- * created by passing 0x20000000 in dwFlagsAndAttributes to WIMGAPI's
- * WIMCreateFile() and specifying either NONE, XPRESS, or LZMS compression.
- * This format is currently undocumented by Microsoft and is seemingly
- * incompatible with their own ImageX and Dism programs; however, it seems to be
- * used for Windows 8 updates. The format appears to feature a new flag (0x10)
- * in resource entries, which I've named WIM_RESHDR_FLAG_CONCAT. */
-#define WIM_VERSION_STREAM_CONCAT 0xe00
-
-/* WIM magic characters, translated to a single 64-bit little endian number. */
-#define WIM_MAGIC \
- cpu_to_le64(((u64)'M' << 0) | \
- ((u64)'S' << 8) | \
- ((u64)'W' << 16) | \
- ((u64)'I' << 24) | \
- ((u64)'M' << 32) | \
- ((u64)'\0' << 40) | \
- ((u64)'\0' << 48) | \
- ((u64)'\0' << 54))
-
-/* wimlib pipable WIM magic characters, translated to a single 64-bit little
- * endian number. */
-#define PWM_MAGIC \
- cpu_to_le64(((u64)'W' << 0) | \
- ((u64)'L' << 8) | \
- ((u64)'P' << 16) | \
- ((u64)'W' << 24) | \
- ((u64)'M' << 32) | \
- ((u64)'\0' << 40) | \
- ((u64)'\0' << 48) | \
- ((u64)'\0' << 54))
+/* Version number used for WIMs that allow multiple streams packed into one
+ * resource (WIM_RESHDR_FLAG_PACKED_STREAMS). New as of Windows 8 WIMGAPI; used
+ * for the Windows 8 web downloader, but yet not yet properly documented by
+ * Microsoft. */
+#define WIM_VERSION_PACKED_STREAMS 0xe00
+
+/* Note: there is another WIM version from Vista pre-releases, but it is not
+ * supported by wimlib. */
+
+/* WIM magic characters, translated to a single 64-bit number. */
+#define WIM_MAGIC \
+ (((u64)'M' << 0) | \
+ ((u64)'S' << 8) | \
+ ((u64)'W' << 16) | \
+ ((u64)'I' << 24) | \
+ ((u64)'M' << 32) | \
+ ((u64)'\0' << 40) | \
+ ((u64)'\0' << 48) | \
+ ((u64)'\0' << 54))
+
+/* wimlib pipable WIM magic characters, translated to a single 64-bit number.
+ * */
+#define PWM_MAGIC \
+ (((u64)'W' << 0) | \
+ ((u64)'L' << 8) | \
+ ((u64)'P' << 16) | \
+ ((u64)'W' << 24) | \
+ ((u64)'M' << 32) | \
+ ((u64)'\0' << 40) | \
+ ((u64)'\0' << 48) | \
+ ((u64)'\0' << 54))
/* On-disk format of the WIM header. */
struct wim_header_disk {
- /* Magic characters "MSWIM\0\0\0" */
+ /* +0x00: Magic characters "MSWIM\0\0\0". */
le64 magic;
- /* Size of the WIM header, in bytes; WIM_HEADER_DISK_SIZE expected
- * (currently the only supported value). */
+ /* +0x08: Size of the WIM header, in bytes; WIM_HEADER_DISK_SIZE
+ * expected (currently the only supported value). */
u32 hdr_size;
- /* Version of the WIM file
- * TODO */
+ /* +0x0c: Version of the WIM file. Recognized values are the
+ * WIM_VERSION_* constants from above. */
u32 wim_version;
- /* Flags for the WIM file (WIM_HDR_FLAG_*) */
+ /* +0x10: Flags for the WIM file (WIM_HDR_FLAG_*). */
u32 wim_flags;
- /* Chunk size for compressed resources in the WIM, or 0 if the WIM is
- * uncompressed. */
+ /* +0x14: Uncompressed chunk size for compressed resources in the WIM
+ * other than packed resources, or 0 if the WIM is uncompressed. */
u32 chunk_size;
- /* Globally unique identifier for the WIM file. Basically a bunch of
- * random bytes. */
+ /* +0x18: Globally unique identifier for the WIM file. Basically a
+ * bunch of random bytes. */
u8 guid[WIM_GID_LEN];
- /* Number of this WIM part in the split WIM file, indexed from 1, or 1
- * if the WIM is not split. */
+ /* +0x28: Number of this WIM part in the split WIM file, indexed from 1,
+ * or 1 if the WIM is not split. */
u16 part_number;
- /* Total number of parts of the split WIM file, or 1 if the WIM is not
- * split. */
+ /* +0x2a: Total number of parts of the split WIM file, or 1 if the WIM
+ * is not split. */
u16 total_parts;
- /* Number of images in the WIM. */
+ /* +0x2c: Number of images in the WIM. */
u32 image_count;
- /* Location and size of the WIM's lookup table. */
+ /* +0x30: Location and size of the WIM's lookup table. */
struct wim_reshdr_disk lookup_table_reshdr;
- /* Location and size of the WIM's XML data. */
+ /* +0x48: Location and size of the WIM's XML data. */
struct wim_reshdr_disk xml_data_reshdr;
- /* Location and size of metadata resource for the bootable image of the
- * WIM, or all zeroes if no image is bootable. */
+ /* +0x60: Location and size of metadata resource for the bootable image
+ * of the WIM, or all zeroes if no image is bootable. */
struct wim_reshdr_disk boot_metadata_reshdr;
- /* 1-based index of the bootable image of the WIM, or 0 if no image is
- * bootable. */
+ /* +0x78: 1-based index of the bootable image of the WIM, or 0 if no
+ * image is bootable. */
u32 boot_idx;
- /* Location and size of the WIM's integrity table, or all zeroes if the
- * WIM has no integrity table.
+ /* +0x7c: Location and size of the WIM's integrity table, or all zeroes
+ * if the WIM has no integrity table.
*
- * Note the integrity_table_reshdr here is 4-byte aligned even though
- * it would ordinarily be 8-byte aligned--- hence, the _packed_attribute
- * on the `struct wim_header_disk' is essential. */
+ * Note the integrity_table_reshdr here is 4-byte aligned even though it
+ * would ordinarily be 8-byte aligned--- hence, the _packed_attribute on
+ * this structure is essential. */
struct wim_reshdr_disk integrity_table_reshdr;
- /* Unused bytes. */
+ /* +0x94: Unused bytes. */
u8 unused[60];
+
+ /* +0xd0 (208) */
} _packed_attribute;
-/* Header at the very beginning of the WIM file. This is the in-memory
- * representation and does not include all fields; see `struct wim_header_disk'
- * for the on-disk structure. */
+/* In-memory representation of a WIM header. See `struct wim_header_disk' for
+ * field descriptions. */
struct wim_header {
-
- /* Magic characters: either WIM_MAGIC or PWM_MAGIC. */
- le64 magic;
-
- /* Version of the WIM file */
+ u64 magic;
u32 wim_version;
-
- /* Bitwise OR of one or more of the WIM_HDR_FLAG_* defined below. */
u32 flags;
-
- /* Compressed resource chunk size */
u32 chunk_size;
-
- /* A unique identifier for the WIM file. */
u8 guid[WIM_GID_LEN];
-
- /* Part number of the WIM file in a spanned set. */
u16 part_number;
-
- /* Total number of parts in a spanned set. */
u16 total_parts;
-
- /* Number of images in the WIM file. */
u32 image_count;
-
- /* Location, size, and flags of the lookup table of the WIM. */
struct wim_reshdr lookup_table_reshdr;
-
- /* Location, size, and flags for the XML data of the WIM. */
struct wim_reshdr xml_data_reshdr;
-
- /* Location, size, and flags for the boot metadata. This means the
- * metadata resource for the image specified by boot_idx below. Should
- * be zeroed out if boot_idx is 0. */
struct wim_reshdr boot_metadata_reshdr;
-
- /* The index of the bootable image in the WIM file. If 0, there are no
- * bootable images available. */
u32 boot_idx;
-
- /* The location of the optional integrity table used to verify the
- * integrity WIM. Zeroed out if there is no integrity table.*/
struct wim_reshdr integrity_table_reshdr;
};
git://wimlib.net / wimlib / blobdiff