fs/hfsplus/unicode.c - kernel/msm-4.9 - Gitiles

 /*
  *  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_strcasecmp(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;
 	}
 }

 /* Compare names as a sequence of 16-bit unsigned integers */
 int hfsplus_strcmp(const struct hfsplus_unistr *s1,
 		   const struct hfsplus_unistr *s2)
 {
 	u16 len1, len2, c1, c2;
 	const hfsplus_unichr *p1, *p2;
 	int len;

 	len1 = be16_to_cpu(s1->length);
 	len2 = be16_to_cpu(s2->length);
 	p1 = s1->unicode;
 	p2 = s2->unicode;

 	for (len = min(len1, len2); len > 0; len--) {
 		c1 = be16_to_cpu(*p1);
 		c2 = be16_to_cpu(*p2);
 		if (c1 != c2)
 			return c1 < c2 ? -1 : 1;
 		p1++;
 		p2++;
 	}

 	return len1 < len2 ? -1 :
 	       len1 > len2 ? 1 : 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 = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);

 	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;
 }

 /*
  * 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)
 {
 	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;

 	decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
 	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;
 }

 /*
  * 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(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();
 	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))) {
 			do {
 				c2 = *dstr++;
 				if (!casefold || (c2 = case_fold(c2)))
 					hash = partial_name_hash(c2, hash);
 			} while (--dsize > 0);
 		} else {
 			c2 = c;
 			if (!casefold || (c2 = case_fold(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 = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
 	decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
 	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;
 }
	/*
	* 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_strcasecmp(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;
	}
	}

	/* Compare names as a sequence of 16-bit unsigned integers */
	int hfsplus_strcmp(const struct hfsplus_unistr *s1,
	const struct hfsplus_unistr *s2)
	{
	u16 len1, len2, c1, c2;
	const hfsplus_unichr p1, p2;
	int len;

	len1 = be16_to_cpu(s1->length);
	len2 = be16_to_cpu(s2->length);
	p1 = s1->unicode;
	p2 = s2->unicode;

	for (len = min(len1, len2); len > 0; len--) {
	c1 = be16_to_cpu(*p1);
	c2 = be16_to_cpu(*p2);
	if (c1 != c2)
	return c1 < c2 ? -1 : 1;
	p1++;
	p2++;
	}

	return len1 < len2 ? -1 :
	len1 > len2 ? 1 : 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 = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);

	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;
	}

	/*
	* 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)
	{
	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;

	decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
	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;
	}

	/*
	* 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(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();
	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))) {
	do {
	c2 = *dstr++;
	if (!casefold \|\| (c2 = case_fold(c2)))
	hash = partial_name_hash(c2, hash);
	} while (--dsize > 0);
	} else {
	c2 = c;
	if (!casefold \|\| (c2 = case_fold(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 = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
	decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
	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;
	}