1 files changed, 81 insertions, 0 deletions
diff --git a/disk-utils/cramfs.h b/disk-utils/cramfs.h
new file mode 100644
index 00000000..34b32ca1
--- /dev/null
+++ b/disk-utils/cramfs.h
@@ -0,0 +1,81 @@
+#ifndef __CRAMFS_H
+#define __CRAMFS_H
+
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned int u32;
+
+#define CRAMFS_MAGIC		0x28cd3d45	/* some random number */
+#define CRAMFS_SIGNATURE	"Compressed ROMFS"
+
+/*
+ * Width of various bitfields in struct cramfs_inode.
+ * Primarily used to generate warnings in mkcramfs.
+ */
+#define CRAMFS_MODE_WIDTH 16
+#define CRAMFS_UID_WIDTH 16
+#define CRAMFS_SIZE_WIDTH 24
+#define CRAMFS_GID_WIDTH 8
+#define CRAMFS_NAMELEN_WIDTH 6
+#define CRAMFS_OFFSET_WIDTH 26
+
+
+/*
+ * Reasonably terse representation of the inode data.
+ */
+struct cramfs_inode {
+	u32 mode:16, uid:16;
+	/* SIZE for device files is i_rdev */
+	u32 size:24, gid:8;
+	/* NAMELEN is the length of the file name, divided by 4 and
+           rounded up.  (cramfs doesn't support hard links.) */
+	/* OFFSET: For symlinks and non-empty regular files, this
+	   contains the offset (divided by 4) of the file data in
+	   compressed form (starting with an array of block pointers;
+	   see README).  For non-empty directories it is the offset
+	   (divided by 4) of the inode of the first file in that
+	   directory.  For anything else, offset is zero. */
+	u32 namelen:6, offset:26;
+};
+
+struct cramfs_info {
+        u32 crc;
+        u32 edition;
+        u32 blocks;
+        u32 files;
+};
+
+/*
+ * Superblock information at the beginning of the FS.
+ */
+struct cramfs_super {
+	u32 magic;		/* 0x28cd3d45 - random number */
+	u32 size;		/* Not used.  mkcramfs currently
+                                   writes a constant 1<<16 here. */
+	u32 flags;		/* 0 */
+	u32 future;		/* 0 */
+	u8 signature[16];	/* "Compressed ROMFS" */
+	struct cramfs_info fsid;/* unique filesystem info */
+	u8 name[16];		/* user-defined name */
+	struct cramfs_inode root;	/* Root inode data */
+};
+
+#define CRAMFS_FLAG_FSID_VERSION_2      0x00000001      /* fsid version #2 */
+#define CRAMFS_FLAG_SORTED_DIRS         0x00000002      /* sorted dirs */
+#define CRAMFS_FLAG_HOLES               0x00000100      /* support for holes */
+#define CRAMFS_FLAG_WRONG_SIGNATURE     0x00000200      /* reserved */
+#define CRAMFS_FLAG_SHIFTED_ROOT_OFFSET 0x00000400      /* shifted root fs */
+
+/*
+ * Valid values in super.flags.  Currently we refuse to mount
+ * if (flags & ~CRAMFS_SUPPORTED_FLAGS).  Maybe that should be
+ * changed to test super.future instead.
+ */
+#define CRAMFS_SUPPORTED_FLAGS (0xff)
+
+/* Uncompression interfaces to the underlying zlib */
+int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen);
+int cramfs_uncompress_init(void);
+int cramfs_uncompress_exit(void);
+
+#endif