diff options
Diffstat (limited to 'include/cramfs')
| -rw-r--r-- | include/cramfs/cramfs_fs.h | 70 |
1 files changed, 54 insertions, 16 deletions
diff --git a/include/cramfs/cramfs_fs.h b/include/cramfs/cramfs_fs.h index 7b292c0..2333709 100644 --- a/include/cramfs/cramfs_fs.h +++ b/include/cramfs/cramfs_fs.h @@ -1,14 +1,6 @@ #ifndef __CRAMFS_H #define __CRAMFS_H -#ifndef __KERNEL__ - -typedef unsigned char u8; -typedef unsigned short u16; -typedef unsigned int u32; - -#endif - #define CRAMFS_MAGIC 0x28cd3d45 /* some random number */ #define CRAMFS_SIGNATURE "Compressed ROMFS" @@ -16,12 +8,12 @@ typedef unsigned int u32; * 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 +#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 /* * Since inode.namelen is a unsigned 6-bit number, the maximum cramfs @@ -34,8 +26,10 @@ typedef unsigned int u32; */ struct cramfs_inode { u32 mode:CRAMFS_MODE_WIDTH, uid:CRAMFS_UID_WIDTH; + /* SIZE for device files is i_rdev */ u32 size:CRAMFS_SIZE_WIDTH, gid:CRAMFS_GID_WIDTH; + /* 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 @@ -90,9 +84,53 @@ struct cramfs_super { | CRAMFS_FLAG_WRONG_SIGNATURE \ | CRAMFS_FLAG_SHIFTED_ROOT_OFFSET ) +/* + * Since cramfs is little-endian, provide macros to swab the bitfields. + */ + +#ifndef __BYTE_ORDER +#if defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN) +#define __BYTE_ORDER __LITTLE_ENDIAN +#elif defined(__BIG_ENDIAN) && !defined(__LITTLE_ENDIAN) +#define __BYTE_ORDER __BIG_ENDIAN +#else +#error "unable to define __BYTE_ORDER" +#endif +#endif /* not __BYTE_ORDER */ + +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define CRAMFS_16(x) (x) +#define CRAMFS_24(x) (x) +#define CRAMFS_32(x) (x) +#define CRAMFS_GET_NAMELEN(x) ((x)->namelen) +#define CRAMFS_GET_OFFSET(x) ((x)->offset) +#define CRAMFS_SET_OFFSET(x,y) ((x)->offset = (y)) +#define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y)) +#elif __BYTE_ORDER == __BIG_ENDIAN +#ifdef __KERNEL__ +#define CRAMFS_16(x) swab16(x) +#define CRAMFS_24(x) ((swab32(x)) >> 8) +#define CRAMFS_32(x) swab32(x) +#else /* not __KERNEL__ */ +#define CRAMFS_16(x) bswap_16(x) +#define CRAMFS_24(x) ((bswap_32(x)) >> 8) +#define CRAMFS_32(x) bswap_32(x) +#endif /* not __KERNEL__ */ +#define CRAMFS_GET_NAMELEN(x) (((u8*)(x))[8] & 0x3f) +#define CRAMFS_GET_OFFSET(x) ((CRAMFS_24(((u32*)(x))[2] & 0xffffff) << 2) |\ + ((((u32*)(x))[2] & 0xc0000000) >> 30)) +#define CRAMFS_SET_NAMELEN(x,y) (((u8*)(x))[8] = (((0x3f & (y))) | \ + (0xc0 & ((u8*)(x))[8]))) +#define CRAMFS_SET_OFFSET(x,y) (((u32*)(x))[2] = (((y) & 3) << 30) | \ + CRAMFS_24((((y) & 0x03ffffff) >> 2)) | \ + (((u32)(((u8*)(x))[8] & 0x3f)) << 24)) +#else +#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN" +#endif + /* Uncompression interfaces to the underlying zlib */ -int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen); +int cramfs_uncompress_block(void *dst, void *src, int srclen); int cramfs_uncompress_init(void); int cramfs_uncompress_exit(void); -#endif +#endif /* __CRAMFS_H */ |