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/*
* unicode.c
*
* Copyright (c) 2001-2002 Ben Fennema <bfennema@falcon.csc.calpoly.edu>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/**
* @file
* libudffs unicode handling functions
*/
#include "libudffs.h"
#include "config.h"
int decode_utf8(char *in, char *out, int inlen)
{
int len = 0, i;
unsigned int c;
if (in[inlen-1] == 0)
return 0;
else if (in[0] != 8 && in[0] != 16)
return 0;
for (i=1; i<inlen;)
{
c = in[i++];
if (in[0] == 16)
c = (c << 8) | in[i++];
if (c == 0x00U)
break;
else if (c < 0x80U)
out[len++] = (uint8_t)c;
else if (c < 0x800U)
{
out[len++] = (uint8_t)(0xc0 | (c >> 6));
out[len++] = (uint8_t)(0x80 | (c & 0x3f));
}
else
{
out[len++] = (uint8_t)(0xe0 | (c >> 12));
out[len++] = (uint8_t)(0x80 | ((c >> 6) & 0x3f));
out[len++] = (uint8_t)(0x80 | (c & 0x3f));
}
}
return len;
}
int encode_utf8(char *out, char *hdr, char *in, int outlen)
{
int inlen = strlen(in);
int utf_cnt, len = 1, i;
uint32_t utf_char, max_val;
unsigned int c;
out[0] = 8;
max_val = 0xFF;
try_again:
utf_cnt = 0;
utf_char = 0;
if (max_val == 0xFF)
{
memcpy(&out[1], hdr, strlen(hdr));
len = strlen(hdr) + 1;
}
else if (max_val == 0xFFFF)
{
for (i=0; i<strlen(hdr); i++)
out[2+(i*2)] = hdr[i];
len = (strlen(hdr) * 2) + 1;
}
for (i=0; i<inlen; i++)
{
c = in[i];
/* 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 & 0x1fU;
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
goto error_out;
continue;
}
else
{
/* Single byte UTF-8 character (most common) */
utf_char = c;
}
}
/* Choose no compression if necessary */
if (utf_char > max_val)
{
if ( 0xFF == max_val )
{
max_val = 0xFFFF;
out[0] = 0x10;
goto try_again;
}
goto error_out;
}
if (max_val == 0xFFFF)
{
if (len + 2 >= outlen)
goto error_out;
out[len++] = utf_char >> 8;
}
if (len + 1 >= outlen)
goto error_out;
out[len++] = utf_char & 0xFF;
}
if (utf_cnt)
error_out:
return 0;
return len;
}
int decode_string(struct udf_disc *disc, char *in, char *out, int inlen)
{
if (disc->flags & FLAG_UTF8)
return decode_utf8(in, out, inlen);
else if (disc->flags & (FLAG_UNICODE8 | FLAG_UNICODE16))
{
memcpy(out, &in[1], inlen);
return inlen;
}
else
return 0;
}
int encode_string(struct udf_disc *disc, char *out, char *hdr, char *in, int outlen)
{
int i;
memset(out, 0x00, outlen);
if (disc->flags & FLAG_UTF8)
return encode_utf8(out, hdr, in, outlen);
else if (disc->flags & FLAG_UNICODE8)
{
if (strlen(hdr) + strlen(in) >= outlen - 2)
return 0;
else
{
memcpy(&out[1], hdr, strlen(hdr));
memcpy(&out[1+strlen(hdr)], in, strlen(in));
out[0] = 0x08;
return strlen(hdr) + strlen(in) + 1;
}
}
else if (disc->flags & FLAG_UNICODE16)
{
if (strlen(hdr)*2 + strlen(in) >= outlen - 2)
return 0;
else
{
for (i=0; i<strlen(hdr); i++)
out[2+(i*2)] = hdr[i];
memcpy(&out[1+(strlen(hdr)*2)], in, strlen(in));
out[0] = 0x10;
return (strlen(hdr) * 2) + strlen(in) + 1;
}
}
else
return 0;
}
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