Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1e96b7ca1e8f17c5117da369daaa7cf2edfdf9b1
Commit: 1e96b7ca1e8f17c5117da369daaa7cf2edfdf9b1
Parent: 29bc5b4f73a65ef667df50d5ed474e371471d915
Author: Duane Griffin <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 23:41:22 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 09:05:49 2007 -0700
HFS+: refactor ASCII to unicode conversion routine for later reuse
The HFS+ filesystem is case-insensitive and does automatic unicode
decomposition by default, but does not provide custom dentry operations.
This
can lead to multiple dentries being cached for lookups on a filename with
varying case and/or character (de)composition.
These patches add custom dentry hash and comparison operations for
case-sensitive and/or automatically decomposing HFS+ filesystems. Unicode
decomposition and case-folding are performed as required to ensure
equivalent
filenames are hashed to the same values and compare as equal.
This patch:
Refactor existing HFS+ ASCII to unicode string conversion routine to split
out
character conversion functionality. This will be reused by the custom
dentry
hash and comparison routines. This approach avoids unnecessary memory
allocation compared to using the string conversion routine directly in the
new
functions.
[EMAIL PROTECTED]: avoid use-of-uninitialised]
Signed-off-by: Duane Griffin <[EMAIL PROTECTED]>
Signed-off-by: Roman Zippel <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/hfsplus/unicode.c | 107 +++++++++++++++++++++++++++++---------------------
1 files changed, 62 insertions(+), 45 deletions(-)
diff --git a/fs/hfsplus/unicode.c b/fs/hfsplus/unicode.c
index 689c8bd..5df0052 100644
--- a/fs/hfsplus/unicode.c
+++ b/fs/hfsplus/unicode.c
@@ -239,58 +239,75 @@ out:
return res;
}
-int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr, const
char *astr, int len)
+/*
+ * Convert one or more ASCII characters into a single unicode character.
+ * Returns the number of ASCII characters corresponding to the unicode char.
+ */
+static inline int asc2unichar(struct super_block *sb, const char *astr, int
len,
+ wchar_t *uc)
{
- struct nls_table *nls = HFSPLUS_SB(sb).nls;
- int size, off, decompose;
+ int size = HFSPLUS_SB(sb).nls->char2uni(astr, len, uc);
+ if (size <= 0) {
+ *uc = '?';
+ size = 1;
+ }
+ switch (*uc) {
+ case 0x2400:
+ *uc = 0;
+ break;
+ case ':':
+ *uc = '/';
+ break;
+ }
+ return size;
+}
+
+/* Decomposes a single unicode character. */
+static inline u16 *decompose_unichar(wchar_t uc, int *size)
+{
+ int off;
+
+ off = hfsplus_decompose_table[(uc >> 12) & 0xf];
+ if (off == 0 || off == 0xffff)
+ return NULL;
+
+ off = hfsplus_decompose_table[off + ((uc >> 8) & 0xf)];
+ if (!off)
+ return NULL;
+
+ off = hfsplus_decompose_table[off + ((uc >> 4) & 0xf)];
+ if (!off)
+ return NULL;
+
+ off = hfsplus_decompose_table[off + (uc & 0xf)];
+ *size = off & 3;
+ if (*size == 0)
+ return NULL;
+ return hfsplus_decompose_table + (off / 4);
+}
+
+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;
- u16 outlen = 0;
decompose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE);
-
while (outlen < HFSPLUS_MAX_STRLEN && len > 0) {
- size = nls->char2uni(astr, len, &c);
- if (size <= 0) {
- c = '?';
- size = 1;
- }
- astr += size;
- len -= size;
- switch (c) {
- case 0x2400:
- c = 0;
- break;
- case ':':
- c = '/';
- break;
- }
- if (c >= 0xc0 && decompose) {
- off = hfsplus_decompose_table[(c >> 12) & 0xf];
- if (!off)
- goto done;
- if (off == 0xffff) {
- goto done;
- }
- off = hfsplus_decompose_table[off + ((c >> 8) & 0xf)];
- if (!off)
- goto done;
- off = hfsplus_decompose_table[off + ((c >> 4) & 0xf)];
- if (!off)
- goto done;
- off = hfsplus_decompose_table[off + (c & 0xf)];
- size = off & 3;
- if (!size)
- goto done;
- off /= 4;
- if (outlen + size > HFSPLUS_MAX_STRLEN)
+ 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(hfsplus_decompose_table[off++]);
- } while (--size > 0);
- continue;
- }
- done:
- ustr->unicode[outlen++] = cpu_to_be16(c);
+ 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)
-
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