470 lines
9.2 KiB
C
470 lines
9.2 KiB
C
/*
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* linux/fs/hfsplus/unicode.c
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*
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* Copyright (C) 2001
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* Brad Boyer (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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*
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* Handler routines for unicode strings
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*/
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#include <linux/types.h>
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#include <linux/nls.h>
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#include "hfsplus_fs.h"
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#include "hfsplus_raw.h"
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/* Fold the case of a unicode char, given the 16 bit value */
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/* Returns folded char, or 0 if ignorable */
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static inline u16 case_fold(u16 c)
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{
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u16 tmp;
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tmp = hfsplus_case_fold_table[c >> 8];
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if (tmp)
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tmp = hfsplus_case_fold_table[tmp + (c & 0xff)];
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else
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tmp = c;
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return tmp;
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}
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/* Compare unicode strings, return values like normal strcmp */
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int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
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const struct hfsplus_unistr *s2)
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{
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u16 len1, len2, c1, c2;
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const hfsplus_unichr *p1, *p2;
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len1 = be16_to_cpu(s1->length);
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len2 = be16_to_cpu(s2->length);
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p1 = s1->unicode;
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p2 = s2->unicode;
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while (1) {
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c1 = c2 = 0;
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while (len1 && !c1) {
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c1 = case_fold(be16_to_cpu(*p1));
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p1++;
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len1--;
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}
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while (len2 && !c2) {
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c2 = case_fold(be16_to_cpu(*p2));
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p2++;
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len2--;
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}
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if (c1 != c2)
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return (c1 < c2) ? -1 : 1;
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if (!c1 && !c2)
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return 0;
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}
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}
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/* Compare names as a sequence of 16-bit unsigned integers */
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int hfsplus_strcmp(const struct hfsplus_unistr *s1,
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const struct hfsplus_unistr *s2)
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{
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u16 len1, len2, c1, c2;
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const hfsplus_unichr *p1, *p2;
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int len;
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len1 = be16_to_cpu(s1->length);
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len2 = be16_to_cpu(s2->length);
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p1 = s1->unicode;
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p2 = s2->unicode;
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for (len = min(len1, len2); len > 0; len--) {
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c1 = be16_to_cpu(*p1);
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c2 = be16_to_cpu(*p2);
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if (c1 != c2)
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return c1 < c2 ? -1 : 1;
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p1++;
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p2++;
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}
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return len1 < len2 ? -1 :
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len1 > len2 ? 1 : 0;
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}
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#define Hangul_SBase 0xac00
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#define Hangul_LBase 0x1100
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#define Hangul_VBase 0x1161
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#define Hangul_TBase 0x11a7
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#define Hangul_SCount 11172
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#define Hangul_LCount 19
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#define Hangul_VCount 21
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#define Hangul_TCount 28
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#define Hangul_NCount (Hangul_VCount * Hangul_TCount)
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static u16 *hfsplus_compose_lookup(u16 *p, u16 cc)
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{
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int i, s, e;
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s = 1;
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e = p[1];
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if (!e || cc < p[s * 2] || cc > p[e * 2])
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return NULL;
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do {
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i = (s + e) / 2;
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if (cc > p[i * 2])
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s = i + 1;
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else if (cc < p[i * 2])
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e = i - 1;
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else
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return hfsplus_compose_table + p[i * 2 + 1];
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} while (s <= e);
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return NULL;
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}
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int hfsplus_uni2asc(struct super_block *sb,
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const struct hfsplus_unistr *ustr,
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char *astr, int *len_p)
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{
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const hfsplus_unichr *ip;
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struct nls_table *nls = HFSPLUS_SB(sb)->nls;
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u8 *op;
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u16 cc, c0, c1;
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u16 *ce1, *ce2;
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int i, len, ustrlen, res, compose;
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op = astr;
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ip = ustr->unicode;
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ustrlen = be16_to_cpu(ustr->length);
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len = *len_p;
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ce1 = NULL;
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compose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
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while (ustrlen > 0) {
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c0 = be16_to_cpu(*ip++);
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ustrlen--;
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/* search for single decomposed char */
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if (likely(compose))
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ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c0);
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if (ce1)
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cc = ce1[0];
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else
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cc = 0;
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if (cc) {
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/* start of a possibly decomposed Hangul char */
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if (cc != 0xffff)
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goto done;
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if (!ustrlen)
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goto same;
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c1 = be16_to_cpu(*ip) - Hangul_VBase;
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if (c1 < Hangul_VCount) {
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/* compose the Hangul char */
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cc = (c0 - Hangul_LBase) * Hangul_VCount;
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cc = (cc + c1) * Hangul_TCount;
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cc += Hangul_SBase;
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ip++;
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ustrlen--;
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if (!ustrlen)
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goto done;
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c1 = be16_to_cpu(*ip) - Hangul_TBase;
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if (c1 > 0 && c1 < Hangul_TCount) {
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cc += c1;
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ip++;
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ustrlen--;
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}
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goto done;
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}
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}
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while (1) {
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/* main loop for common case of not composed chars */
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if (!ustrlen)
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goto same;
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c1 = be16_to_cpu(*ip);
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if (likely(compose))
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ce1 = hfsplus_compose_lookup(
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hfsplus_compose_table, c1);
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if (ce1)
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break;
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switch (c0) {
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case 0:
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c0 = 0x2400;
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break;
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case '/':
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c0 = ':';
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break;
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}
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res = nls->uni2char(c0, op, len);
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if (res < 0) {
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if (res == -ENAMETOOLONG)
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goto out;
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*op = '?';
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res = 1;
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}
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op += res;
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len -= res;
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c0 = c1;
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ip++;
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ustrlen--;
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}
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ce2 = hfsplus_compose_lookup(ce1, c0);
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if (ce2) {
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i = 1;
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while (i < ustrlen) {
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ce1 = hfsplus_compose_lookup(ce2,
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be16_to_cpu(ip[i]));
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if (!ce1)
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break;
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i++;
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ce2 = ce1;
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}
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cc = ce2[0];
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if (cc) {
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ip += i;
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ustrlen -= i;
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goto done;
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}
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}
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same:
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switch (c0) {
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case 0:
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cc = 0x2400;
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break;
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case '/':
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cc = ':';
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break;
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default:
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cc = c0;
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}
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done:
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res = nls->uni2char(cc, op, len);
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if (res < 0) {
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if (res == -ENAMETOOLONG)
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goto out;
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*op = '?';
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res = 1;
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}
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op += res;
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len -= res;
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}
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res = 0;
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out:
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*len_p = (char *)op - astr;
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return res;
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}
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/*
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* Convert one or more ASCII characters into a single unicode character.
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* Returns the number of ASCII characters corresponding to the unicode char.
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*/
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static inline int asc2unichar(struct super_block *sb, const char *astr, int len,
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wchar_t *uc)
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{
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int size = HFSPLUS_SB(sb)->nls->char2uni(astr, len, uc);
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if (size <= 0) {
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*uc = '?';
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size = 1;
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}
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switch (*uc) {
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case 0x2400:
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*uc = 0;
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break;
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case ':':
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*uc = '/';
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break;
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}
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return size;
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}
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/* Decomposes a single unicode character. */
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static inline u16 *decompose_unichar(wchar_t uc, int *size)
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{
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int off;
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off = hfsplus_decompose_table[(uc >> 12) & 0xf];
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if (off == 0 || off == 0xffff)
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return NULL;
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off = hfsplus_decompose_table[off + ((uc >> 8) & 0xf)];
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if (!off)
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return NULL;
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off = hfsplus_decompose_table[off + ((uc >> 4) & 0xf)];
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if (!off)
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return NULL;
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off = hfsplus_decompose_table[off + (uc & 0xf)];
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*size = off & 3;
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if (*size == 0)
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return NULL;
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return hfsplus_decompose_table + (off / 4);
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}
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int hfsplus_asc2uni(struct super_block *sb,
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struct hfsplus_unistr *ustr, int max_unistr_len,
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const char *astr, int len)
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{
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int size, dsize, decompose;
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u16 *dstr, outlen = 0;
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wchar_t c;
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decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
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while (outlen < max_unistr_len && len > 0) {
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size = asc2unichar(sb, astr, len, &c);
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if (decompose)
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dstr = decompose_unichar(c, &dsize);
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else
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dstr = NULL;
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if (dstr) {
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if (outlen + dsize > max_unistr_len)
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break;
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do {
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ustr->unicode[outlen++] = cpu_to_be16(*dstr++);
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} while (--dsize > 0);
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} else
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ustr->unicode[outlen++] = cpu_to_be16(c);
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astr += size;
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len -= size;
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}
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ustr->length = cpu_to_be16(outlen);
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if (len > 0)
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return -ENAMETOOLONG;
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return 0;
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}
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/*
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* Hash a string to an integer as appropriate for the HFS+ filesystem.
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* Composed unicode characters are decomposed and case-folding is performed
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* if the appropriate bits are (un)set on the superblock.
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*/
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int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str)
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{
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struct super_block *sb = dentry->d_sb;
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const char *astr;
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const u16 *dstr;
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int casefold, decompose, size, len;
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unsigned long hash;
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wchar_t c;
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u16 c2;
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casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
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decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
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hash = init_name_hash(dentry);
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astr = str->name;
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len = str->len;
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while (len > 0) {
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int uninitialized_var(dsize);
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size = asc2unichar(sb, astr, len, &c);
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astr += size;
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len -= size;
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if (decompose)
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dstr = decompose_unichar(c, &dsize);
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else
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dstr = NULL;
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if (dstr) {
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do {
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c2 = *dstr++;
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if (casefold)
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c2 = case_fold(c2);
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if (!casefold || c2)
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hash = partial_name_hash(c2, hash);
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} while (--dsize > 0);
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} else {
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c2 = c;
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if (casefold)
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c2 = case_fold(c2);
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if (!casefold || c2)
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hash = partial_name_hash(c2, hash);
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}
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}
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str->hash = end_name_hash(hash);
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return 0;
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}
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/*
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* Compare strings with HFS+ filename ordering.
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* Composed unicode characters are decomposed and case-folding is performed
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* if the appropriate bits are (un)set on the superblock.
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*/
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int hfsplus_compare_dentry(const struct dentry *dentry,
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unsigned int len, const char *str, const struct qstr *name)
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{
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struct super_block *sb = dentry->d_sb;
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int casefold, decompose, size;
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int dsize1, dsize2, len1, len2;
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const u16 *dstr1, *dstr2;
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const char *astr1, *astr2;
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u16 c1, c2;
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wchar_t c;
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casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
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decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
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astr1 = str;
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len1 = len;
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astr2 = name->name;
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len2 = name->len;
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dsize1 = dsize2 = 0;
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dstr1 = dstr2 = NULL;
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while (len1 > 0 && len2 > 0) {
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if (!dsize1) {
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size = asc2unichar(sb, astr1, len1, &c);
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astr1 += size;
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len1 -= size;
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if (decompose)
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dstr1 = decompose_unichar(c, &dsize1);
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if (!decompose || !dstr1) {
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c1 = c;
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dstr1 = &c1;
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dsize1 = 1;
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}
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}
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if (!dsize2) {
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size = asc2unichar(sb, astr2, len2, &c);
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astr2 += size;
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len2 -= size;
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if (decompose)
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dstr2 = decompose_unichar(c, &dsize2);
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if (!decompose || !dstr2) {
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c2 = c;
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dstr2 = &c2;
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dsize2 = 1;
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}
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}
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c1 = *dstr1;
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c2 = *dstr2;
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if (casefold) {
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c1 = case_fold(c1);
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if (!c1) {
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dstr1++;
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dsize1--;
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continue;
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}
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c2 = case_fold(c2);
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if (!c2) {
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dstr2++;
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dsize2--;
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continue;
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}
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}
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if (c1 < c2)
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return -1;
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else if (c1 > c2)
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return 1;
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dstr1++;
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dsize1--;
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dstr2++;
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dsize2--;
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}
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if (len1 < len2)
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return -1;
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if (len1 > len2)
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return 1;
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return 0;
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}
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