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path: root/drivers/staging/exfat/exfat_nls.c
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Diffstat (limited to 'drivers/staging/exfat/exfat_nls.c')
-rw-r--r--drivers/staging/exfat/exfat_nls.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/drivers/staging/exfat/exfat_nls.c b/drivers/staging/exfat/exfat_nls.c
new file mode 100644
index 000000000000..03cb8290b5d2
--- /dev/null
+++ b/drivers/staging/exfat/exfat_nls.c
@@ -0,0 +1,404 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/string.h>
+#include <linux/nls.h>
+#include "exfat.h"
+
+static u16 bad_dos_chars[] = {
+ /* + , ; = [ ] */
+ 0x002B, 0x002C, 0x003B, 0x003D, 0x005B, 0x005D,
+ 0xFF0B, 0xFF0C, 0xFF1B, 0xFF1D, 0xFF3B, 0xFF3D,
+ 0
+};
+
+static u16 bad_uni_chars[] = {
+ /* " * / : < > ? \ | */
+ 0x0022, 0x002A, 0x002F, 0x003A,
+ 0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
+ 0
+};
+
+static int convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch,
+ bool *lossy)
+{
+ int len;
+
+ *uni = 0x0;
+
+ if (ch[0] < 0x80) {
+ *uni = (u16)ch[0];
+ return 1;
+ }
+
+ len = nls->char2uni(ch, NLS_MAX_CHARSET_SIZE, uni);
+ if (len < 0) {
+ /* conversion failed */
+ pr_info("%s: fail to use nls\n", __func__);
+ if (lossy)
+ *lossy = true;
+ *uni = (u16)'_';
+ if (!strcmp(nls->charset, "utf8"))
+ return 1;
+ else
+ return 2;
+ }
+
+ return len;
+}
+
+static int convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni,
+ bool *lossy)
+{
+ int len;
+
+ ch[0] = 0x0;
+
+ if (uni < 0x0080) {
+ ch[0] = (u8)uni;
+ return 1;
+ }
+
+ len = nls->uni2char(uni, ch, NLS_MAX_CHARSET_SIZE);
+ if (len < 0) {
+ /* conversion failed */
+ pr_info("%s: fail to use nls\n", __func__);
+ if (lossy)
+ *lossy = true;
+ ch[0] = '_';
+ return 1;
+ }
+
+ return len;
+}
+
+u16 nls_upper(struct super_block *sb, u16 a)
+{
+ struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
+
+ if (EXFAT_SB(sb)->options.casesensitive)
+ return a;
+ if (p_fs->vol_utbl && p_fs->vol_utbl[get_col_index(a)])
+ return p_fs->vol_utbl[get_col_index(a)][get_row_index(a)];
+ else
+ return a;
+}
+
+static u16 *nls_wstrchr(u16 *str, u16 wchar)
+{
+ while (*str) {
+ if (*(str++) == wchar)
+ return str;
+ }
+
+ return NULL;
+}
+
+int nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b)
+{
+ return strncmp(a, b, DOS_NAME_LENGTH);
+}
+
+int nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b)
+{
+ int i;
+
+ for (i = 0; i < MAX_NAME_LENGTH; i++, a++, b++) {
+ if (nls_upper(sb, *a) != nls_upper(sb, *b))
+ return 1;
+ if (*a == 0x0)
+ return 0;
+ }
+ return 0;
+}
+
+void nls_uniname_to_dosname(struct super_block *sb,
+ struct dos_name_t *p_dosname,
+ struct uni_name_t *p_uniname, bool *p_lossy)
+{
+ int i, j, len;
+ bool lossy = false;
+ u8 buf[MAX_CHARSET_SIZE];
+ u8 lower = 0, upper = 0;
+ u8 *dosname = p_dosname->name;
+ u16 *uniname = p_uniname->name;
+ u16 *p, *last_period;
+ struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
+
+ for (i = 0; i < DOS_NAME_LENGTH; i++)
+ *(dosname + i) = ' ';
+
+ if (!nls_uniname_cmp(sb, uniname, (u16 *)UNI_CUR_DIR_NAME)) {
+ *(dosname) = '.';
+ p_dosname->name_case = 0x0;
+ if (p_lossy)
+ *p_lossy = false;
+ return;
+ }
+
+ if (!nls_uniname_cmp(sb, uniname, (u16 *)UNI_PAR_DIR_NAME)) {
+ *(dosname) = '.';
+ *(dosname + 1) = '.';
+ p_dosname->name_case = 0x0;
+ if (p_lossy)
+ *p_lossy = false;
+ return;
+ }
+
+ /* search for the last embedded period */
+ last_period = NULL;
+ for (p = uniname; *p; p++) {
+ if (*p == (u16)'.')
+ last_period = p;
+ }
+
+ i = 0;
+ while (i < DOS_NAME_LENGTH) {
+ if (i == 8) {
+ if (!last_period)
+ break;
+
+ if (uniname <= last_period) {
+ if (uniname < last_period)
+ lossy = true;
+ uniname = last_period + 1;
+ }
+ }
+
+ if (*uniname == (u16)'\0') {
+ break;
+ } else if (*uniname == (u16)' ') {
+ lossy = true;
+ } else if (*uniname == (u16)'.') {
+ if (uniname < last_period)
+ lossy = true;
+ else
+ i = 8;
+ } else if (nls_wstrchr(bad_dos_chars, *uniname)) {
+ lossy = true;
+ *(dosname + i) = '_';
+ i++;
+ } else {
+ len = convert_uni_to_ch(nls, buf, *uniname, &lossy);
+
+ if (len > 1) {
+ if ((i >= 8) && ((i + len) > DOS_NAME_LENGTH))
+ break;
+
+ if ((i < 8) && ((i + len) > 8)) {
+ i = 8;
+ continue;
+ }
+
+ lower = 0xFF;
+
+ for (j = 0; j < len; j++, i++)
+ *(dosname + i) = *(buf + j);
+ } else { /* len == 1 */
+ if ((*buf >= 'a') && (*buf <= 'z')) {
+ *(dosname + i) = *buf - ('a' - 'A');
+
+ if (i < 8)
+ lower |= 0x08;
+ else
+ lower |= 0x10;
+ } else if ((*buf >= 'A') && (*buf <= 'Z')) {
+ *(dosname + i) = *buf;
+
+ if (i < 8)
+ upper |= 0x08;
+ else
+ upper |= 0x10;
+ } else {
+ *(dosname + i) = *buf;
+ }
+ i++;
+ }
+ }
+
+ uniname++;
+ }
+
+ if (*dosname == 0xE5)
+ *dosname = 0x05;
+
+ if (*uniname != 0x0)
+ lossy = true;
+
+ if (upper & lower)
+ p_dosname->name_case = 0xFF;
+ else
+ p_dosname->name_case = lower;
+
+ if (p_lossy)
+ *p_lossy = lossy;
+}
+
+void nls_dosname_to_uniname(struct super_block *sb,
+ struct uni_name_t *p_uniname,
+ struct dos_name_t *p_dosname)
+{
+ int i = 0, j, n = 0;
+ u8 buf[DOS_NAME_LENGTH + 2];
+ u8 *dosname = p_dosname->name;
+ u16 *uniname = p_uniname->name;
+ struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
+
+ if (*dosname == 0x05) {
+ *buf = 0xE5;
+ i++;
+ n++;
+ }
+
+ for (; i < 8; i++, n++) {
+ if (*(dosname + i) == ' ')
+ break;
+
+ if ((*(dosname + i) >= 'A') && (*(dosname + i) <= 'Z') &&
+ (p_dosname->name_case & 0x08))
+ *(buf + n) = *(dosname + i) + ('a' - 'A');
+ else
+ *(buf + n) = *(dosname + i);
+ }
+ if (*(dosname + 8) != ' ') {
+ *(buf + n) = '.';
+ n++;
+ }
+
+ for (i = 8; i < DOS_NAME_LENGTH; i++, n++) {
+ if (*(dosname + i) == ' ')
+ break;
+
+ if ((*(dosname + i) >= 'A') && (*(dosname + i) <= 'Z') &&
+ (p_dosname->name_case & 0x10))
+ *(buf + n) = *(dosname + i) + ('a' - 'A');
+ else
+ *(buf + n) = *(dosname + i);
+ }
+ *(buf + n) = '\0';
+
+ i = 0;
+ j = 0;
+ while (j < (MAX_NAME_LENGTH - 1)) {
+ if (*(buf + i) == '\0')
+ break;
+
+ i += convert_ch_to_uni(nls, uniname, (buf + i), NULL);
+
+ uniname++;
+ j++;
+ }
+
+ *uniname = (u16)'\0';
+}
+
+void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring,
+ struct uni_name_t *p_uniname)
+{
+ int i, j, len;
+ u8 buf[MAX_CHARSET_SIZE];
+ u16 *uniname = p_uniname->name;
+ struct nls_table *nls = EXFAT_SB(sb)->nls_io;
+
+ if (!nls) {
+ len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH,
+ UTF16_HOST_ENDIAN, p_cstring,
+ MAX_NAME_LENGTH);
+ p_cstring[len] = 0;
+ return;
+ }
+
+ i = 0;
+ while (i < (MAX_NAME_LENGTH - 1)) {
+ if (*uniname == (u16)'\0')
+ break;
+
+ len = convert_uni_to_ch(nls, buf, *uniname, NULL);
+
+ if (len > 1) {
+ for (j = 0; j < len; j++)
+ *p_cstring++ = (char)*(buf + j);
+ } else { /* len == 1 */
+ *p_cstring++ = (char)*buf;
+ }
+
+ uniname++;
+ i++;
+ }
+
+ *p_cstring = '\0';
+}
+
+void nls_cstring_to_uniname(struct super_block *sb,
+ struct uni_name_t *p_uniname, u8 *p_cstring,
+ bool *p_lossy)
+{
+ int i, j;
+ bool lossy = false;
+ u8 *end_of_name;
+ u8 upname[MAX_NAME_LENGTH * 2];
+ u16 *uniname = p_uniname->name;
+ struct nls_table *nls = EXFAT_SB(sb)->nls_io;
+
+ /* strip all trailing spaces */
+ end_of_name = p_cstring + strlen(p_cstring);
+
+ while (*(--end_of_name) == ' ') {
+ if (end_of_name < p_cstring)
+ break;
+ }
+ *(++end_of_name) = '\0';
+
+ if (strcmp(p_cstring, ".") && strcmp(p_cstring, "..")) {
+ /* strip all trailing periods */
+ while (*(--end_of_name) == '.') {
+ if (end_of_name < p_cstring)
+ break;
+ }
+ *(++end_of_name) = '\0';
+ }
+
+ if (*p_cstring == '\0')
+ lossy = true;
+
+ if (!nls) {
+ i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH,
+ UTF16_HOST_ENDIAN, uniname,
+ MAX_NAME_LENGTH);
+ for (j = 0; j < i; j++)
+ SET16_A(upname + j * 2, nls_upper(sb, uniname[j]));
+ uniname[i] = '\0';
+ } else {
+ i = 0;
+ j = 0;
+ while (j < (MAX_NAME_LENGTH - 1)) {
+ if (*(p_cstring + i) == '\0')
+ break;
+
+ i += convert_ch_to_uni(nls, uniname,
+ (u8 *)(p_cstring + i), &lossy);
+
+ if ((*uniname < 0x0020) ||
+ nls_wstrchr(bad_uni_chars, *uniname))
+ lossy = true;
+
+ SET16_A(upname + j * 2, nls_upper(sb, *uniname));
+
+ uniname++;
+ j++;
+ }
+
+ if (*(p_cstring + i) != '\0')
+ lossy = true;
+ *uniname = (u16)'\0';
+ }
+
+ p_uniname->name_len = j;
+ p_uniname->name_hash = calc_checksum_2byte(upname, j << 1, 0,
+ CS_DEFAULT);
+
+ if (p_lossy)
+ *p_lossy = lossy;
+}
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