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udf: Use UTF-32 <-> UTF-8 conversion functions from NLS

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Instead of implementing our own functions converting to and from UTF-8,
use the ones provided by NLS.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2018-04-12 17:06:18 +02:00
parent b8333ea1ad
commit b8a41c44a4
1 changed files with 16 additions and 62 deletions
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78
fs/udf/unicode.c
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@ -28,6 +28,7 @@
#include "udf_sb.h"
#define UNICODE_MAX 0x10ffff
#define SURROGATE_MASK 0xfffff800
#define SURROGATE_PAIR 0x0000d800
@ -40,22 +41,12 @@ static int udf_uni2char_utf8(wchar_t uni,
if (boundlen <= 0)
return -ENAMETOOLONG;
if ((uni & SURROGATE_MASK) == SURROGATE_PAIR)
return -EINVAL;
if (uni < 0x80) {
out[u_len++] = (unsigned char)uni;
} else if (uni < 0x800) {
if (boundlen < 2)
return -ENAMETOOLONG;
out[u_len++] = (unsigned char)(0xc0 | (uni >> 6));
out[u_len++] = (unsigned char)(0x80 | (uni & 0x3f));
} else {
if (boundlen < 3)
return -ENAMETOOLONG;
out[u_len++] = (unsigned char)(0xe0 | (uni >> 12));
out[u_len++] = (unsigned char)(0x80 | ((uni >> 6) & 0x3f));
out[u_len++] = (unsigned char)(0x80 | (uni & 0x3f));
u_len = utf32_to_utf8(uni, out, boundlen);
if (u_len < 0) {
if (uni > UNICODE_MAX ||
(uni & SURROGATE_MASK) == SURROGATE_PAIR)
return -EINVAL;
return -ENAMETOOLONG;
}
return u_len;
}
@ -64,56 +55,19 @@ static int udf_char2uni_utf8(const unsigned char *in,
int boundlen,
wchar_t *uni)
{
unsigned int utf_char;
unsigned char c;
int utf_cnt, u_len;
int u_len;
unicode_t c;
utf_char = 0;
utf_cnt = 0;
for (u_len = 0; u_len < boundlen;) {
c = in[u_len++];
/* Complete a multi-byte UTF-8 character */
if (utf_cnt) {
utf_char = (utf_char << 6) | (c & 0x3f);
if (--utf_cnt)
continue;
} else {
/* Check for a multi-byte UTF-8 character */
if (c & 0x80) {
/* Start a multi-byte UTF-8 character */
if ((c & 0xe0) == 0xc0) {
utf_char = c & 0x1f;
utf_cnt = 1;
} else if ((c & 0xf0) == 0xe0) {
utf_char = c & 0x0f;
utf_cnt = 2;
} else if ((c & 0xf8) == 0xf0) {
utf_char = c & 0x07;
utf_cnt = 3;
} else if ((c & 0xfc) == 0xf8) {
utf_char = c & 0x03;
utf_cnt = 4;
} else if ((c & 0xfe) == 0xfc) {
utf_char = c & 0x01;
utf_cnt = 5;
} else {
utf_cnt = -1;
break;
}
continue;
} else {
/* Single byte UTF-8 character (most common) */
utf_char = c;
}
}
*uni = utf_char;
break;
}
if (utf_cnt) {
u_len = utf8_to_utf32(in, boundlen, &c);
if (u_len < 0) {
*uni = '?';
return -EINVAL;
}
if (c > MAX_WCHAR_T)
*uni = '?';
else
*uni = c;
return u_len;
}