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/*
* libid3tag - ID3 tag manipulation library
* Copyright (C) 2000-2004 Underbit Technologies, Inc.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: ucs4.c,v 1.13 2004/01/23 09:41:32 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include <stdlib.h>
# include "id3tag.h"
# include "ucs4.h"
# include "latin1.h"
# include "utf16.h"
# include "utf8.h"
id3_ucs4_t const id3_ucs4_empty[] = { 0 };
/*
* NAME: ucs4->length()
* DESCRIPTION: return the number of ucs4 chars represented by a ucs4 string
*/
id3_length_t id3_ucs4_length(id3_ucs4_t const *ucs4)
{
id3_ucs4_t const *ptr = ucs4;
while (*ptr)
++ptr;
return ptr - ucs4;
}
/*
* NAME: ucs4->size()
* DESCRIPTION: return the encoding size of a ucs4 string
*/
id3_length_t id3_ucs4_size(id3_ucs4_t const *ucs4)
{
return id3_ucs4_length(ucs4) + 1;
}
/*
* NAME: ucs4->latin1size()
* DESCRIPTION: return the encoding size of a latin1-encoded ucs4 string
*/
id3_length_t id3_ucs4_latin1size(id3_ucs4_t const *ucs4)
{
return id3_ucs4_size(ucs4);
}
/*
* NAME: ucs4->utf16size()
* DESCRIPTION: return the encoding size of a utf16-encoded ucs4 string
*/
id3_length_t id3_ucs4_utf16size(id3_ucs4_t const *ucs4)
{
id3_length_t size = 0;
while (*ucs4) {
++size;
if (*ucs4 >= 0x00010000L &&
*ucs4 <= 0x0010ffffL)
++size;
++ucs4;
}
return size + 1;
}
/*
* NAME: ucs4->utf8size()
* DESCRIPTION: return the encoding size of a utf8-encoded ucs4 string
*/
id3_length_t id3_ucs4_utf8size(id3_ucs4_t const *ucs4)
{
id3_length_t size = 0;
while (*ucs4) {
if (*ucs4 <= 0x0000007fL)
size += 1;
else if (*ucs4 <= 0x000007ffL)
size += 2;
else if (*ucs4 <= 0x0000ffffL)
size += 3;
else if (*ucs4 <= 0x001fffffL)
size += 4;
else if (*ucs4 <= 0x03ffffffL)
size += 5;
else if (*ucs4 <= 0x7fffffffL)
size += 6;
else
size += 2; /* based on U+00B7 replacement char */
++ucs4;
}
return size + 1;
}
/*
* NAME: ucs4->latin1duplicate()
* DESCRIPTION: duplicate and encode a ucs4 string into latin1
*/
id3_latin1_t *id3_ucs4_latin1duplicate(id3_ucs4_t const *ucs4)
{
id3_latin1_t *latin1;
latin1 = malloc(id3_ucs4_latin1size(ucs4) * sizeof(*latin1));
if (latin1)
id3_latin1_encode(latin1, ucs4);
return release(latin1);
}
/*
* NAME: ucs4->utf16duplicate()
* DESCRIPTION: duplicate and encode a ucs4 string into utf16
*/
id3_utf16_t *id3_ucs4_utf16duplicate(id3_ucs4_t const *ucs4)
{
id3_utf16_t *utf16;
utf16 = malloc(id3_ucs4_utf16size(ucs4) * sizeof(*utf16));
if (utf16)
id3_utf16_encode(utf16, ucs4);
return release(utf16);
}
/*
* NAME: ucs4->utf8duplicate()
* DESCRIPTION: duplicate and encode a ucs4 string into utf8
*/
id3_utf8_t *id3_ucs4_utf8duplicate(id3_ucs4_t const *ucs4)
{
id3_utf8_t *utf8;
utf8 = malloc(id3_ucs4_utf8size(ucs4) * sizeof(*utf8));
if (utf8)
id3_utf8_encode(utf8, ucs4);
return release(utf8);
}
/*
* NAME: ucs4->copy()
* DESCRIPTION: copy a ucs4 string
*/
void id3_ucs4_copy(id3_ucs4_t *dest, id3_ucs4_t const *src)
{
while ((*dest++ = *src++))
;
}
/*
* NAME: ucs4->duplicate()
* DESCRIPTION: duplicate a ucs4 string
*/
id3_ucs4_t *id3_ucs4_duplicate(id3_ucs4_t const *src)
{
id3_ucs4_t *ucs4;
ucs4 = malloc(id3_ucs4_size(src) * sizeof(*ucs4));
if (ucs4)
id3_ucs4_copy(ucs4, src);
return ucs4;
}
/*
* NAME: ucs4->putnumber()
* DESCRIPTION: write a ucs4 string containing a (positive) decimal number
*/
void id3_ucs4_putnumber(id3_ucs4_t *ucs4, unsigned long number)
{
int digits[10], *digit;
digit = digits;
do {
*digit++ = number % 10;
number /= 10;
}
while (number);
while (digit != digits)
*ucs4++ = '0' + *--digit;
*ucs4 = 0;
}
/*
* NAME: ucs4->getnumber()
* DESCRIPTION: read a ucs4 string containing a (positive) decimal number
*/
unsigned long id3_ucs4_getnumber(id3_ucs4_t const *ucs4)
{
unsigned long number = 0;
while (*ucs4 >= '0' && *ucs4 <= '9')
number = 10 * number + (*ucs4++ - '0');
return number;
}
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