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Diffstat (limited to 'include/libexfat.h')
| -rw-r--r-- | include/libexfat.h | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/include/libexfat.h b/include/libexfat.h new file mode 100644 index 0000000..0623501 --- /dev/null +++ b/include/libexfat.h @@ -0,0 +1,199 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> + */ + +#ifndef _LIBEXFAT_H + +#include <stdbool.h> +#include <sys/types.h> +#include <wchar.h> +#include <limits.h> + +typedef __u32 clus_t; + +#define KB (1024) +#define MB (1024*1024) +#define GB (1024UL*1024UL*1024UL) + +#define __round_mask(x, y) ((__typeof__(x))((y)-1)) +#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) +#define round_down(x, y) ((x) & ~__round_mask(x, y)) + +#define MIN(a, b) ((a) < (b) ? (a) : (b)) +#define MAX(a, b) ((a) > (b) ? (a) : (b)) + +#define DIV_ROUND_UP(__i, __d) (((__i) + (__d) - 1) / (__d)) + +#define EXFAT_MIN_NUM_SEC_VOL (2048) +#define EXFAT_MAX_NUM_SEC_VOL ((2 << 64) - 1) + +#define EXFAT_MAX_NUM_CLUSTER (0xFFFFFFF5) + +#define DEFAULT_BOUNDARY_ALIGNMENT (1024*1024) + +#define DEFAULT_SECTOR_SIZE (512) + +#define VOLUME_LABEL_BUFFER_SIZE (VOLUME_LABEL_MAX_LEN*MB_LEN_MAX+1) + +/* Upcase table macro */ +#define EXFAT_UPCASE_TABLE_CHARS (0x10000) +#define EXFAT_UPCASE_TABLE_SIZE (5836) + +/* Flags for tune.exfat and exfatlabel */ +#define EXFAT_GET_VOLUME_LABEL 0x01 +#define EXFAT_SET_VOLUME_LABEL 0x02 +#define EXFAT_GET_VOLUME_SERIAL 0x03 +#define EXFAT_SET_VOLUME_SERIAL 0x04 + +#define EXFAT_MAX_SECTOR_SIZE 4096 + +#define EXFAT_CLUSTER_SIZE(pbr) (1 << ((pbr)->bsx.sect_size_bits + \ + (pbr)->bsx.sect_per_clus_bits)) +#define EXFAT_SECTOR_SIZE(pbr) (1 << (pbr)->bsx.sect_size_bits) + +enum { + BOOT_SEC_IDX = 0, + EXBOOT_SEC_IDX, + EXBOOT_SEC_NUM = 8, + OEM_SEC_IDX, + RESERVED_SEC_IDX, + CHECKSUM_SEC_IDX, + BACKUP_BOOT_SEC_IDX, +}; + +struct exfat_blk_dev { + int dev_fd; + unsigned long long offset; + unsigned long long size; + unsigned int sector_size; + unsigned int sector_size_bits; + unsigned long long num_sectors; + unsigned int num_clusters; + unsigned int cluster_size; +}; + +struct exfat_user_input { + char dev_name[255]; + bool writeable; + unsigned int cluster_size; + unsigned int sec_per_clu; + unsigned int boundary_align; + bool pack_bitmap; + bool quick; + __u16 volume_label[VOLUME_LABEL_MAX_LEN]; + int volume_label_len; + unsigned int volume_serial; +}; + +struct exfat; +struct exfat_inode; + +#ifdef WORDS_BIGENDIAN +typedef __u8 bitmap_t; +#else +typedef __u32 bitmap_t; +#endif + +#define BITS_PER (sizeof(bitmap_t) * 8) +#define BIT_MASK(__c) (1 << ((__c) % BITS_PER)) +#define BIT_ENTRY(__c) ((__c) / BITS_PER) + +#define EXFAT_BITMAP_SIZE(__c_count) \ + (DIV_ROUND_UP(__c_count, BITS_PER) * sizeof(bitmap_t)) + +static inline bool exfat_bitmap_get(char *bmap, clus_t c) +{ + clus_t cc = c - EXFAT_FIRST_CLUSTER; + + return ((bitmap_t *)(bmap))[BIT_ENTRY(cc)] & BIT_MASK(cc); +} + +static inline void exfat_bitmap_set(char *bmap, clus_t c) +{ + clus_t cc = c - EXFAT_FIRST_CLUSTER; + + (((bitmap_t *)(bmap))[BIT_ENTRY(cc)] |= BIT_MASK(cc)); +} + +static inline void exfat_bitmap_clear(char *bmap, clus_t c) +{ + clus_t cc = c - EXFAT_FIRST_CLUSTER; + (((bitmap_t *)(bmap))[BIT_ENTRY(cc)] &= ~BIT_MASK(cc)); +} + +void exfat_bitmap_set_range(struct exfat *exfat, char *bitmap, + clus_t start_clus, clus_t count); +int exfat_bitmap_find_zero(struct exfat *exfat, char *bmap, + clus_t start_clu, clus_t *next); +int exfat_bitmap_find_one(struct exfat *exfat, char *bmap, + clus_t start_clu, clus_t *next); + +void show_version(void); + +wchar_t exfat_bad_char(wchar_t w); +void boot_calc_checksum(unsigned char *sector, unsigned short size, + bool is_boot_sec, __le32 *checksum); +void init_user_input(struct exfat_user_input *ui); +int exfat_get_blk_dev_info(struct exfat_user_input *ui, + struct exfat_blk_dev *bd); +ssize_t exfat_read(int fd, void *buf, size_t size, off_t offset); +ssize_t exfat_write(int fd, void *buf, size_t size, off_t offset); + +size_t exfat_utf16_len(const __le16 *str, size_t max_size); +ssize_t exfat_utf16_enc(const char *in_str, __u16 *out_str, size_t out_size); +ssize_t exfat_utf16_dec(const __u16 *in_str, size_t in_len, + char *out_str, size_t out_size); +off_t exfat_get_root_entry_offset(struct exfat_blk_dev *bd); +int exfat_read_volume_label(struct exfat *exfat); +int exfat_set_volume_label(struct exfat *exfat, char *label_input); +int exfat_read_sector(struct exfat_blk_dev *bd, void *buf, + unsigned int sec_off); +int exfat_write_sector(struct exfat_blk_dev *bd, void *buf, + unsigned int sec_off); +int exfat_write_checksum_sector(struct exfat_blk_dev *bd, + unsigned int checksum, bool is_backup); +char *exfat_conv_volume_label(struct exfat_dentry *vol_entry); +int exfat_show_volume_serial(int fd); +int exfat_set_volume_serial(struct exfat_blk_dev *bd, + struct exfat_user_input *ui); +unsigned int exfat_clus_to_blk_dev_off(struct exfat_blk_dev *bd, + unsigned int clu_off, unsigned int clu); +int exfat_get_next_clus(struct exfat *exfat, clus_t clus, clus_t *next); +int exfat_get_inode_next_clus(struct exfat *exfat, struct exfat_inode *node, + clus_t clus, clus_t *next); +int exfat_set_fat(struct exfat *exfat, clus_t clus, clus_t next_clus); +off_t exfat_s2o(struct exfat *exfat, off_t sect); +off_t exfat_c2o(struct exfat *exfat, unsigned int clus); +int exfat_o2c(struct exfat *exfat, off_t device_offset, + unsigned int *clu, unsigned int *offset); +bool exfat_heap_clus(struct exfat *exfat, clus_t clus); +int exfat_root_clus_count(struct exfat *exfat); +int read_boot_sect(struct exfat_blk_dev *bdev, struct pbr **bs); + +/* + * Exfat Print + */ + +extern unsigned int print_level; + +#define EXFAT_ERROR (1) +#define EXFAT_INFO (2) +#define EXFAT_DEBUG (3) + +#define exfat_msg(level, dir, fmt, ...) \ + do { \ + if (print_level >= level) { \ + fprintf(dir, fmt, ##__VA_ARGS__); \ + } \ + } while (0) \ + +#define exfat_err(fmt, ...) exfat_msg(EXFAT_ERROR, stderr, \ + fmt, ##__VA_ARGS__) +#define exfat_info(fmt, ...) exfat_msg(EXFAT_INFO, stdout, \ + fmt, ##__VA_ARGS__) +#define exfat_debug(fmt, ...) exfat_msg(EXFAT_DEBUG, stdout, \ + "[%s:%4d] " fmt, __func__, \ + __LINE__, ##__VA_ARGS__) + +#endif /* !_LIBEXFAT_H */ |