diff options
Diffstat (limited to 'fs/hfsplus/unicode.c')
| -rw-r--r-- | fs/hfsplus/unicode.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/fs/hfsplus/unicode.c b/fs/hfsplus/unicode.c new file mode 100644 index 00000000000..060c69048c3 --- /dev/null +++ b/fs/hfsplus/unicode.c @@ -0,0 +1,271 @@ +/* + * linux/fs/hfsplus/unicode.c + * + * Copyright (C) 2001 + * Brad Boyer (flar@allandria.com) + * (C) 2003 Ardis Technologies <roman@ardistech.com> + * + * Handler routines for unicode strings + */ + +#include <linux/types.h> +#include <linux/nls.h> +#include "hfsplus_fs.h" +#include "hfsplus_raw.h" + +/* Fold the case of a unicode char, given the 16 bit value */ +/* Returns folded char, or 0 if ignorable */ +static inline u16 case_fold(u16 c) +{ + u16 tmp; + + tmp = hfsplus_case_fold_table[c >> 8]; + if (tmp) + tmp = hfsplus_case_fold_table[tmp + (c & 0xff)]; + else + tmp = c; + return tmp; +} + +/* Compare unicode strings, return values like normal strcmp */ +int hfsplus_unistrcmp(const struct hfsplus_unistr *s1, const struct hfsplus_unistr *s2) +{ + u16 len1, len2, c1, c2; + const hfsplus_unichr *p1, *p2; + + len1 = be16_to_cpu(s1->length); + len2 = be16_to_cpu(s2->length); + p1 = s1->unicode; + p2 = s2->unicode; + + while (1) { + c1 = c2 = 0; + + while (len1 && !c1) { + c1 = case_fold(be16_to_cpu(*p1)); + p1++; + len1--; + } + while (len2 && !c2) { + c2 = case_fold(be16_to_cpu(*p2)); + p2++; + len2--; + } + + if (c1 != c2) + return (c1 < c2) ? -1 : 1; + if (!c1 && !c2) + return 0; + } +} + +#define Hangul_SBase 0xac00 +#define Hangul_LBase 0x1100 +#define Hangul_VBase 0x1161 +#define Hangul_TBase 0x11a7 +#define Hangul_SCount 11172 +#define Hangul_LCount 19 +#define Hangul_VCount 21 +#define Hangul_TCount 28 +#define Hangul_NCount (Hangul_VCount * Hangul_TCount) + + +static u16 *hfsplus_compose_lookup(u16 *p, u16 cc) +{ + int i, s, e; + + s = 1; + e = p[1]; + if (!e || cc < p[s * 2] || cc > p[e * 2]) + return NULL; + do { + i = (s + e) / 2; + if (cc > p[i * 2]) + s = i + 1; + else if (cc < p[i * 2]) + e = i - 1; + else + return hfsplus_compose_table + p[i * 2 + 1]; + } while (s <= e); + return NULL; +} + +int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr, char *astr, int *len_p) +{ + const hfsplus_unichr *ip; + struct nls_table *nls = HFSPLUS_SB(sb).nls; + u8 *op; + u16 cc, c0, c1; + u16 *ce1, *ce2; + int i, len, ustrlen, res, compose; + + op = astr; + ip = ustr->unicode; + ustrlen = be16_to_cpu(ustr->length); + len = *len_p; + ce1 = NULL; + compose = !(HFSPLUS_SB(sb).flags & HFSPLUS_SB_NODECOMPOSE); + + while (ustrlen > 0) { + c0 = be16_to_cpu(*ip++); + ustrlen--; + /* search for single decomposed char */ + if (likely(compose)) + ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c0); + if (ce1 && (cc = ce1[0])) { + /* start of a possibly decomposed Hangul char */ + if (cc != 0xffff) + goto done; + if (!ustrlen) + goto same; + c1 = be16_to_cpu(*ip) - Hangul_VBase; + if (c1 < Hangul_VCount) { + /* compose the Hangul char */ + cc = (c0 - Hangul_LBase) * Hangul_VCount; + cc = (cc + c1) * Hangul_TCount; + cc += Hangul_SBase; + ip++; + ustrlen--; + if (!ustrlen) + goto done; + c1 = be16_to_cpu(*ip) - Hangul_TBase; + if (c1 > 0 && c1 < Hangul_TCount) { + cc += c1; + ip++; + ustrlen--; + } + goto done; + } + } + while (1) { + /* main loop for common case of not composed chars */ + if (!ustrlen) + goto same; + c1 = be16_to_cpu(*ip); + if (likely(compose)) + ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c1); + if (ce1) + break; + switch (c0) { + case 0: + c0 = 0x2400; + break; + case '/': + c0 = ':'; + break; + } + res = nls->uni2char(c0, op, len); + if (res < 0) { + if (res == -ENAMETOOLONG) + goto out; + *op = '?'; + res = 1; + } + op += res; + len -= res; + c0 = c1; + ip++; + ustrlen--; + } + ce2 = hfsplus_compose_lookup(ce1, c0); + if (ce2) { + i = 1; + while (i < ustrlen) { + ce1 = hfsplus_compose_lookup(ce2, be16_to_cpu(ip[i])); + if (!ce1) + break; + i++; + ce2 = ce1; + } + if ((cc = ce2[0])) { + ip += i; + ustrlen -= i; + goto done; + } + } + same: + switch (c0) { + case 0: + cc = 0x2400; + break; + case '/': + cc = ':'; + break; + default: + cc = c0; + } + done: + res = nls->uni2char(cc, op, len); + if (res < 0) { + if (res == -ENAMETOOLONG) + goto out; + *op = '?'; + res = 1; + } + op += res; + len -= res; + } + res = 0; +out: + *len_p = (char *)op - astr; + return res; +} + +int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr, const char *astr, int len) +{ + struct nls_table *nls = HFSPLUS_SB(sb).nls; + int size, off, decompose; + 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) + 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->length = cpu_to_be16(outlen); + if (len > 0) + return -ENAMETOOLONG; + return 0; +} |