fs/hfsplus/unicode.c

Source file repositories/reference/linux-study-clean/fs/hfsplus/unicode.c

File Facts

System
Linux kernel
Corpus path
fs/hfsplus/unicode.c
Extension
.c
Size
13826 bytes
Lines
629
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
	}
}
EXPORT_SYMBOL_IF_KUNIT(hfsplus_strcasecmp);

/* 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;

	if (len1 > HFSPLUS_MAX_STRLEN) {
		len1 = HFSPLUS_MAX_STRLEN;
		pr_err("invalid length %u has been corrected to %d\n",
			be16_to_cpu(s1->length), len1);
	}

	if (len2 > HFSPLUS_MAX_STRLEN) {
		len2 = HFSPLUS_MAX_STRLEN;
		pr_err("invalid length %u has been corrected to %d\n",
			be16_to_cpu(s2->length), len2);
	}

	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;
}
EXPORT_SYMBOL_IF_KUNIT(hfsplus_strcmp);

#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;
}

/*

Annotation

Implementation Notes