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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org>
*/
#ifndef _EXFAT_H
#define _EXFAT_H
#include <stdint.h>
#include <linux/fs.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef WORDS_BIGENDIAN
#define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
#define cpu_to_le32(x) \
((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
(((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
#define cpu_to_le64(x) (cpu_to_le32((uint64_t)(x)) << 32 | \
cpu_to_le32((uint64_t)(x) >> 32))
#else
#define cpu_to_le16(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_le64(x) (x)
#endif
#define le64_to_cpu(x) ((uint64_t)cpu_to_le64(x))
#define le32_to_cpu(x) ((uint32_t)cpu_to_le32(x))
#define le16_to_cpu(x) ((uint16_t)cpu_to_le16(x))
#define PBR_SIGNATURE 0xAA55
#define VOL_CLEAN 0x0000
#define VOL_DIRTY 0x0002
#define DENTRY_SIZE 32 /* directory entry size */
#define DENTRY_SIZE_BITS 5
/* exFAT allows 8388608(256MB) directory entries */
#define MAX_EXFAT_DENTRIES 8388608
#define MIN_FILE_DENTRIES 3
#define MAX_NAME_DENTRIES 17
/* dentry types */
#define MSDOS_DELETED 0xE5 /* deleted mark */
#define MSDOS_UNUSED 0x00 /* end of directory */
#define EXFAT_LAST 0x00 /* end of directory */
#define EXFAT_DELETE ~(0x80)
#define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */
#define EXFAT_INVAL 0x80 /* invalid value */
#define EXFAT_BITMAP 0x81 /* allocation bitmap */
#define EXFAT_UPCASE 0x82 /* upcase table */
#define EXFAT_VOLUME 0x83 /* volume label */
#define EXFAT_FILE 0x85 /* file or dir */
#define EXFAT_GUID 0xA0
#define EXFAT_PADDING 0xA1
#define EXFAT_ACLTAB 0xA2
#define EXFAT_STREAM 0xC0 /* stream entry */
#define EXFAT_NAME 0xC1 /* file name entry */
#define EXFAT_ACL 0xC2 /* stream entry */
/* checksum types */
#define CS_DIR_ENTRY 0
#define CS_PBR_SECTOR 1
#define CS_DEFAULT 2
/* file attributes */
#define ATTR_READONLY 0x0001
#define ATTR_HIDDEN 0x0002
#define ATTR_SYSTEM 0x0004
#define ATTR_VOLUME 0x0008
#define ATTR_SUBDIR 0x0010
#define ATTR_ARCHIVE 0x0020
#define ATTR_EXTEND (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | \
ATTR_VOLUME) /* 0x000F */
#define ATTR_EXTEND_MASK (ATTR_EXTEND | ATTR_SUBDIR | ATTR_ARCHIVE)
#define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
ATTR_SUBDIR | ATTR_ARCHIVE)
#define ATTR_READONLY_LE cpu_to_le16(0x0001)
#define ATTR_HIDDEN_LE cpu_to_le16(0x0002)
#define ATTR_SYSTEM_LE cpu_to_le16(0x0004)
#define ATTR_VOLUME_LE cpu_to_le16(0x0008)
#define ATTR_SUBDIR_LE cpu_to_le16(0x0010)
#define ATTR_ARCHIVE_LE cpu_to_le16(0x0020)
/* stream flags */
#define EXFAT_SF_CONTIGUOUS 0x02
#define CLUSTER_32(x) ((unsigned int)((x) & 0xFFFFFFFFU))
#define EXFAT_EOF_CLUSTER CLUSTER_32(~0)
#define EXFAT_BAD_CLUSTER (0xFFFFFFF7U)
#define EXFAT_FREE_CLUSTER (0)
#define EXFAT_FIRST_CLUSTER (2)
#define EXFAT_RESERVED_CLUSTERS (2)
/* EXFAT BIOS parameter block (64 bytes) */
struct bpb64 {
__u8 jmp_boot[3];
__u8 oem_name[8];
__u8 res_zero[53];
};
/* EXFAT EXTEND BIOS parameter block (56 bytes) */
struct bsx64 {
__le64 vol_offset;
__le64 vol_length;
__le32 fat_offset;
__le32 fat_length;
__le32 clu_offset;
__le32 clu_count;
__le32 root_cluster;
__le32 vol_serial;
__u8 fs_version[2];
__le16 vol_flags;
__u8 sect_size_bits;
__u8 sect_per_clus_bits;
__u8 num_fats;
__u8 phy_drv_no;
__u8 perc_in_use;
__u8 reserved2[7];
};
/* Common PBR[Partition Boot Record] (512 bytes) */
struct pbr {
struct bpb64 bpb;
struct bsx64 bsx;
__u8 boot_code[390];
__le16 signature;
};
#define VOLUME_LABEL_MAX_LEN 11
#define VOLUME_GUID_LEN 16
#define ENTRY_NAME_MAX 15
struct exfat_dentry {
__u8 type;
union {
struct {
__u8 character_count;
__le16 volume_label[VOLUME_LABEL_MAX_LEN];
__u8 reserved[8];
} __attribute__((packed)) vol; /* file directory entry */
struct {
__u8 num_ext;
__le16 checksum;
__le16 attr;
__le16 reserved1;
__le16 create_time;
__le16 create_date;
__le16 modify_time;
__le16 modify_date;
__le16 access_time;
__le16 access_date;
__u8 create_time_ms;
__u8 modify_time_ms;
__u8 create_tz;
__u8 modify_tz;
__u8 access_tz;
__u8 reserved2[7];
} __attribute__((packed)) file; /* file directory entry */
struct {
__u8 flags;
__u8 reserved1;
__u8 name_len;
__le16 name_hash;
__le16 reserved2;
__le64 valid_size;
__le32 reserved3;
__le32 start_clu;
__le64 size;
} __attribute__((packed)) stream; /* stream extension directory entry */
struct {
__u8 flags;
__le16 unicode_0_14[15];
} __attribute__((packed)) name; /* file name directory entry */
struct {
__u8 flags;
__u8 reserved[18];
__le32 start_clu;
__le64 size;
} __attribute__((packed)) bitmap; /* allocation bitmap directory entry */
struct {
__u8 reserved1[3];
__le32 checksum;
__u8 reserved2[12];
__le32 start_clu;
__le64 size;
} __attribute__((packed)) upcase; /* up-case table directory entry */
struct {
__u8 num_ext;
__le16 checksum;
__u16 flags;
__u8 guid[VOLUME_GUID_LEN];
__u8 reserved[10];
} __attribute__((packed)) guid; /* volume GUID directory entry */
} __attribute__((packed)) dentry;
} __attribute__((packed));
#define vol_char_cnt dentry.vol.character_count
#define vol_label dentry.vol.volume_label
#define file_num_ext dentry.file.num_ext
#define file_checksum dentry.file.checksum
#define file_attr dentry.file.attr
#define file_create_time dentry.file.create_time
#define file_create_date dentry.file.create_date
#define file_modify_time dentry.file.modify_time
#define file_modify_date dentry.file.modify_date
#define file_access_time dentry.file.access_time
#define file_access_date dentry.file.access_date
#define file_create_time_ms dentry.file.create_time_ms
#define file_modify_time_ms dentry.file.modify_time_ms
#define file_access_time_ms dentry.file.access_time_ms
#define stream_flags dentry.stream.flags
#define stream_name_len dentry.stream.name_len
#define stream_name_hash dentry.stream.name_hash
#define stream_start_clu dentry.stream.start_clu
#define stream_valid_size dentry.stream.valid_size
#define stream_size dentry.stream.size
#define name_flags dentry.name.flags
#define name_unicode dentry.name.unicode_0_14
#define bitmap_flags dentry.bitmap.flags
#define bitmap_start_clu dentry.bitmap.start_clu
#define bitmap_size dentry.bitmap.size
#define upcase_start_clu dentry.upcase.start_clu
#define upcase_size dentry.upcase.size
#define upcase_checksum dentry.upcase.checksum
#endif /* !_EXFAT_H */
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