1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org>
18 #include "exfat_ondisk.h"
22 #ifdef WORDS_BIGENDIAN
23 #define BITOP_LE_SWIZZLE (~0x7)
25 #define BITOP_LE_SWIZZLE 0
28 #define BIT_MASK(nr) ((1) << ((nr) % 32))
29 #define BIT_WORD(nr) ((nr) / 32)
31 unsigned int print_level = EXFAT_INFO;
33 static inline void set_bit(int nr, unsigned int *addr)
35 unsigned long mask = BIT_MASK(nr);
36 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
41 static inline void clear_bit(int nr, unsigned int *addr)
43 unsigned long mask = BIT_MASK(nr);
44 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
49 static inline void set_bit_le(int nr, void *addr)
51 set_bit(nr ^ BITOP_LE_SWIZZLE, addr);
54 static inline void clear_bit_le(int nr, void *addr)
56 clear_bit(nr ^ BITOP_LE_SWIZZLE, addr);
59 void exfat_set_bit(struct exfat_blk_dev *bd, char *bitmap,
64 b = clu & ((bd->sector_size << 3) - 1);
66 set_bit_le(b, bitmap);
69 void exfat_clear_bit(struct exfat_blk_dev *bd, char *bitmap,
74 b = clu & ((bd->sector_size << 3) - 1);
76 clear_bit_le(b, bitmap);
79 wchar_t exfat_bad_char(wchar_t w)
82 || (w == '*') || (w == '?') || (w == '<') || (w == '>')
83 || (w == '|') || (w == '"') || (w == ':') || (w == '/')
87 void boot_calc_checksum(unsigned char *sector, unsigned short size,
88 bool is_boot_sec, __le32 *checksum)
93 for (index = 0; index < size; index++) {
94 if ((index == 106) || (index == 107) || (index == 112))
96 *checksum = ((*checksum & 1) ? 0x80000000 : 0) +
97 (*checksum >> 1) + sector[index];
100 for (index = 0; index < size; index++) {
101 *checksum = ((*checksum & 1) ? 0x80000000 : 0) +
102 (*checksum >> 1) + sector[index];
107 void show_version(void)
109 printf("exfatprogs version : %s\n", EXFAT_PROGS_VERSION);
112 static inline unsigned int sector_size_bits(unsigned int size)
114 unsigned int bits = 8;
119 } while (size > 256);
124 static void exfat_set_default_cluster_size(struct exfat_blk_dev *bd,
125 struct exfat_user_input *ui)
127 if (256 * MB >= bd->size)
128 ui->cluster_size = 4 * KB;
129 else if (32 * GB >= bd->size)
130 ui->cluster_size = 32 * KB;
132 ui->cluster_size = 128 * KB;
135 void init_user_input(struct exfat_user_input *ui)
137 memset(ui, 0, sizeof(struct exfat_user_input));
138 ui->writeable = true;
142 int exfat_get_blk_dev_info(struct exfat_user_input *ui,
143 struct exfat_blk_dev *bd)
148 fd = open(ui->dev_name, ui->writeable ? O_RDWR|O_EXCL : O_RDONLY);
150 exfat_err("open failed : %s, %s\n", ui->dev_name,
154 blk_dev_size = lseek(fd, 0, SEEK_END);
155 if (blk_dev_size <= 0) {
156 exfat_err("invalid block device size(%s)\n",
164 bd->size = blk_dev_size;
165 if (!ui->cluster_size)
166 exfat_set_default_cluster_size(bd, ui);
168 if (ioctl(fd, BLKSSZGET, &bd->sector_size) < 0)
169 bd->sector_size = DEFAULT_SECTOR_SIZE;
170 bd->sector_size_bits = sector_size_bits(bd->sector_size);
171 bd->num_sectors = blk_dev_size / DEFAULT_SECTOR_SIZE;
172 bd->num_clusters = blk_dev_size / ui->cluster_size;
174 exfat_debug("Block device name : %s\n", ui->dev_name);
175 exfat_debug("Block device size : %lld\n", bd->size);
176 exfat_debug("Block sector size : %u\n", bd->sector_size);
177 exfat_debug("Number of the sectors : %llu\n",
179 exfat_debug("Number of the clusters : %u\n",
188 ssize_t exfat_read(int fd, void *buf, size_t size, off_t offset)
190 return pread(fd, buf, size, offset);
193 ssize_t exfat_write(int fd, void *buf, size_t size, off_t offset)
195 return pwrite(fd, buf, size, offset);
198 ssize_t exfat_utf16_enc(const char *in_str, __u16 *out_str, size_t out_size)
200 size_t mbs_len, out_len, i;
203 mbs_len = mbstowcs(NULL, in_str, 0);
204 if (mbs_len == (size_t)-1) {
205 if (errno == EINVAL || errno == EILSEQ)
206 exfat_err("invalid character sequence in current locale\n");
210 wcs = calloc(mbs_len+1, sizeof(wchar_t));
214 /* First convert multibyte char* string to wchar_t* string */
215 if (mbstowcs(wcs, in_str, mbs_len+1) == (size_t)-1) {
216 if (errno == EINVAL || errno == EILSEQ)
217 exfat_err("invalid character sequence in current locale\n");
221 /* Convert wchar_t* string (sequence of code points) to UTF-16 string */
222 for (i = 0, out_len = 0; i < mbs_len; i++) {
223 if (2*(out_len+1) > out_size ||
224 (wcs[i] >= 0x10000 && 2*(out_len+2) > out_size)) {
225 exfat_err("input string is too long\n");
230 /* Encode code point above Plane0 as UTF-16 surrogate pair */
231 if (wcs[i] >= 0x10000) {
233 cpu_to_le16(((wcs[i] - 0x10000) >> 10) + 0xD800);
234 wcs[i] = ((wcs[i] - 0x10000) & 0x3FF) + 0xDC00;
237 out_str[out_len++] = cpu_to_le16(wcs[i]);
244 ssize_t exfat_utf16_dec(const __u16 *in_str, size_t in_len,
245 char *out_str, size_t out_size)
247 size_t wcs_len, out_len, c_len, i;
248 char c_str[MB_LEN_MAX];
253 wcs = calloc(in_len/2+1, sizeof(wchar_t));
257 /* First convert UTF-16 string to wchar_t* string */
258 for (i = 0, wcs_len = 0; i < in_len/2; i++, wcs_len++) {
259 wcs[wcs_len] = le16_to_cpu(in_str[i]);
261 * If wchar_t can store code point above Plane0
262 * then unpack UTF-16 surrogate pair to code point
264 #if WCHAR_MAX >= 0x10FFFF
265 if (wcs[wcs_len] >= 0xD800 && wcs[wcs_len] <= 0xDBFF &&
267 w = le16_to_cpu(in_str[i+1]);
268 if (w >= 0xDC00 && w <= 0xDFFF) {
269 wcs[wcs_len] = 0x10000 +
270 ((wcs[wcs_len] - 0xD800) << 10) +
278 memset(&ps, 0, sizeof(ps));
280 /* And then convert wchar_t* string to multibyte char* string */
281 for (i = 0, out_len = 0, c_len = 0; i < wcs_len; i++) {
282 c_len = wcrtomb(c_str, wcs[i], &ps);
284 * If character is non-representable in current locale then
285 * try to store it as Unicode replacement code point U+FFFD
287 if (c_len == (size_t)-1 && errno == EILSEQ)
288 c_len = wcrtomb(c_str, 0xFFFD, &ps);
289 /* If U+FFFD is also non-representable, try question mark */
290 if (c_len == (size_t)-1 && errno == EILSEQ)
291 c_len = wcrtomb(c_str, L'?', &ps);
292 /* If also (7bit) question mark fails then we cannot do more */
293 if (c_len == (size_t)-1) {
294 exfat_err("invalid UTF-16 sequence\n");
298 if (out_len+c_len > out_size) {
299 exfat_err("input string is too long\n");
303 memcpy(out_str+out_len, c_str, c_len);
309 /* Last iteration of above loop should have produced null byte */
310 if (c_len == 0 || out_str[out_len] != 0) {
311 exfat_err("invalid UTF-16 sequence\n");