int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
const char *astr, int len)
{
int size, dsize, decompose;
u16 *dstr, outlen = 0;
wchar_t c;
decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
while (outlen < HFSPLUS_MAX_STRLEN && len > 0) {
size = asc2unichar(sb, astr, len, &c);
if (decompose && (dstr = decompose_unichar(c, &dsize))) {
if (outlen + dsize > HFSPLUS_MAX_STRLEN)
break;
do {
ustr->unicode[outlen++] = cpu_to_be16(*dstr++);
} while (--dsize > 0);
} else
ustr->unicode[outlen++] = cpu_to_be16(c);
astr += size;
len -= size;
}
ustr->length = cpu_to_be16(outlen);
if (len > 0)
return -ENAMETOOLONG;
return 0;
}
int hfsplus_asc2uni(struct super_block *sb,
struct hfsplus_unistr *ustr, int max_unistr_len,
const char *astr, int len)
{
int size, dsize, decompose;
u16 *dstr, outlen = 0;
wchar_t c;
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
while (outlen < max_unistr_len && len > 0) {
size = asc2unichar(sb, astr, len, &c);
if (decompose)
dstr = decompose_unichar(c, &dsize);
else
dstr = NULL;
if (dstr) {
if (outlen + dsize > max_unistr_len)
break;
do {
ustr->unicode[outlen++] = cpu_to_be16(*dstr++);
} while (--dsize > 0);
} else
ustr->unicode[outlen++] = cpu_to_be16(c);
astr += size;
len -= size;
}
ustr->length = cpu_to_be16(outlen);
if (len > 0)
return -ENAMETOOLONG;
return 0;
}
/*
* Hash a string to an integer as appropriate for the HFS+ filesystem.
* Composed unicode characters are decomposed and case-folding is performed
* if the appropriate bits are (un)set on the superblock.
*/
int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str)
{
struct super_block *sb = dentry->d_sb;
const char *astr;
const u16 *dstr;
int casefold, decompose, size, len;
unsigned long hash;
wchar_t c;
u16 c2;
casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
hash = init_name_hash(dentry);
astr = str->name;
len = str->len;
while (len > 0) {
int uninitialized_var(dsize);
size = asc2unichar(sb, astr, len, &c);
astr += size;
len -= size;
if (decompose)
dstr = decompose_unichar(c, &dsize);
else
dstr = NULL;
if (dstr) {
do {
c2 = *dstr++;
if (casefold)
c2 = case_fold(c2);
if (!casefold || c2)
hash = partial_name_hash(c2, hash);
} while (--dsize > 0);
} else {
c2 = c;
if (casefold)
c2 = case_fold(c2);
if (!casefold || c2)
hash = partial_name_hash(c2, hash);
}
}
str->hash = end_name_hash(hash);
return 0;
}
/*
* Compare strings with HFS+ filename ordering.
* Composed unicode characters are decomposed and case-folding is performed
* if the appropriate bits are (un)set on the superblock.
*/
int hfsplus_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr *s2)
{
struct super_block *sb = dentry->d_sb;
int casefold, decompose, size;
int dsize1, dsize2, len1, len2;
const u16 *dstr1, *dstr2;
const char *astr1, *astr2;
u16 c1, c2;
wchar_t c;
casefold = (HFSPLUS_SB(sb).flags & HFSPLUS_SB_CASEFOLD);
decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
astr1 = s1->name;
len1 = s1->len;
astr2 = s2->name;
len2 = s2->len;
dsize1 = dsize2 = 0;
dstr1 = dstr2 = NULL;
while (len1 > 0 && len2 > 0) {
if (!dsize1) {
size = asc2unichar(sb, astr1, len1, &c);
astr1 += size;
len1 -= size;
if (!decompose || !(dstr1 = decompose_unichar(c, &dsize1))) {
c1 = c;
dstr1 = &c1;
dsize1 = 1;
}
}
if (!dsize2) {
size = asc2unichar(sb, astr2, len2, &c);
astr2 += size;
len2 -= size;
if (!decompose || !(dstr2 = decompose_unichar(c, &dsize2))) {
c2 = c;
dstr2 = &c2;
dsize2 = 1;
}
}
c1 = *dstr1;
c2 = *dstr2;
if (casefold) {
if (!(c1 = case_fold(c1))) {
dstr1++;
dsize1--;
continue;
}
if (!(c2 = case_fold(c2))) {
dstr2++;
dsize2--;
continue;
}
}
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
dstr1++;
dsize1--;
dstr2++;
dsize2--;
}
if (len1 < len2)
return -1;
if (len1 > len2)
return 1;
return 0;
}
/*
* Compare strings with HFS+ filename ordering.
* Composed unicode characters are decomposed and case-folding is performed
* if the appropriate bits are (un)set on the superblock.
*/
int hfsplus_compare_dentry(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
struct super_block *sb = dentry->d_sb;
int casefold, decompose, size;
int dsize1, dsize2, len1, len2;
const u16 *dstr1, *dstr2;
const char *astr1, *astr2;
u16 c1, c2;
wchar_t c;
casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
astr1 = str;
len1 = len;
astr2 = name->name;
len2 = name->len;
dsize1 = dsize2 = 0;
dstr1 = dstr2 = NULL;
while (len1 > 0 && len2 > 0) {
if (!dsize1) {
size = asc2unichar(sb, astr1, len1, &c);
astr1 += size;
len1 -= size;
if (decompose)
dstr1 = decompose_unichar(c, &dsize1);
if (!decompose || !dstr1) {
c1 = c;
dstr1 = &c1;
dsize1 = 1;
}
}
if (!dsize2) {
size = asc2unichar(sb, astr2, len2, &c);
astr2 += size;
len2 -= size;
if (decompose)
dstr2 = decompose_unichar(c, &dsize2);
if (!decompose || !dstr2) {
c2 = c;
dstr2 = &c2;
dsize2 = 1;
}
}
c1 = *dstr1;
c2 = *dstr2;
if (casefold) {
c1 = case_fold(c1);
if (!c1) {
dstr1++;
dsize1--;
continue;
}
c2 = case_fold(c2);
if (!c2) {
dstr2++;
dsize2--;
continue;
}
}
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
dstr1++;
dsize1--;
dstr2++;
dsize2--;
}
if (len1 < len2)
return -1;
if (len1 > len2)
return 1;
return 0;
}