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/*
* encode.c - string conversion routines (mostly for compatibility with
* udev/volume_id)
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include "encode.h"
size_t blkid_encode_to_utf8(int enc, unsigned char *dest, size_t len,
const unsigned char *src, size_t count)
{
size_t i, j;
uint16_t c;
for (j = i = 0; i < count; i++) {
if (enc == BLKID_ENC_UTF16LE) {
if (i+2 > count)
break;
c = (src[i+1] << 8) | src[i];
i++;
} else if (enc == BLKID_ENC_UTF16BE) {
if (i+2 > count)
break;
c = (src[i] << 8) | src[i+1];
i++;
} else if (enc == BLKID_ENC_LATIN1) {
c = src[i];
} else {
return 0;
}
if (c == 0) {
dest[j] = '\0';
break;
} else if (c < 0x80) {
if (j+1 >= len)
break;
dest[j++] = (uint8_t) c;
} else if (c < 0x800) {
if (j+2 >= len)
break;
dest[j++] = (uint8_t) (0xc0 | (c >> 6));
dest[j++] = (uint8_t) (0x80 | (c & 0x3f));
} else {
if (j+3 >= len)
break;
dest[j++] = (uint8_t) (0xe0 | (c >> 12));
dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
dest[j++] = (uint8_t) (0x80 | (c & 0x3f));
}
}
dest[j] = '\0';
return j;
}
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