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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: latin1.c,v 1.10 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 "latin1.h"
# include "ucs4.h"
/*
* NAME: latin1->length()
* DESCRIPTION: return the number of ucs4 chars represented by a latin1 string
*/
id3_length_t id3_latin1_length(id3_latin1_t const *latin1)
{
id3_latin1_t const *ptr = latin1;
while (*ptr)
++ptr;
return ptr - latin1;
}
/*
* NAME: latin1->size()
* DESCRIPTION: return the encoding size of a latin1 string
*/
id3_length_t id3_latin1_size(id3_latin1_t const *latin1)
{
return id3_latin1_length(latin1) + 1;
}
/*
* NAME: latin1->copy()
* DESCRIPTION: copy a latin1 string
*/
void id3_latin1_copy(id3_latin1_t *dest, id3_latin1_t const *src)
{
while ((*dest++ = *src++))
;
}
/*
* NAME: latin1->duplicate()
* DESCRIPTION: duplicate a latin1 string
*/
id3_latin1_t *id3_latin1_duplicate(id3_latin1_t const *src)
{
id3_latin1_t *latin1;
latin1 = malloc(id3_latin1_size(src) * sizeof(*latin1));
if (latin1)
id3_latin1_copy(latin1, src);
return latin1;
}
/*
* NAME: latin1->ucs4duplicate()
* DESCRIPTION: duplicate and decode a latin1 string into ucs4
*/
id3_ucs4_t *id3_latin1_ucs4duplicate(id3_latin1_t const *latin1)
{
id3_ucs4_t *ucs4;
ucs4 = malloc((id3_latin1_length(latin1) + 1) * sizeof(*ucs4));
if (ucs4)
id3_latin1_decode(latin1, ucs4);
return release(ucs4);
}
/*
* NAME: latin1->decodechar()
* DESCRIPTION: decode a (single) latin1 char into a single ucs4 char
*/
id3_length_t id3_latin1_decodechar(id3_latin1_t const *latin1,
id3_ucs4_t *ucs4)
{
*ucs4 = *latin1;
return 1;
}
/*
* NAME: latin1->encodechar()
* DESCRIPTION: encode a single ucs4 char into a (single) latin1 char
*/
id3_length_t id3_latin1_encodechar(id3_latin1_t *latin1, id3_ucs4_t ucs4)
{
*latin1 = ucs4;
if (ucs4 > 0x000000ffL)
*latin1 = ID3_UCS4_REPLACEMENTCHAR;
return 1;
}
/*
* NAME: latin1->decode()
* DESCRIPTION: decode a complete latin1 string into a ucs4 string
*/
void id3_latin1_decode(id3_latin1_t const *latin1, id3_ucs4_t *ucs4)
{
do
latin1 += id3_latin1_decodechar(latin1, ucs4);
while (*ucs4++);
}
/*
* NAME: latin1->encode()
* DESCRIPTION: encode a complete ucs4 string into a latin1 string
*/
void id3_latin1_encode(id3_latin1_t *latin1, id3_ucs4_t const *ucs4)
{
do
latin1 += id3_latin1_encodechar(latin1, *ucs4);
while (*ucs4++);
}
/*
* NAME: latin1->put()
* DESCRIPTION: serialize a single latin1 character
*/
id3_length_t id3_latin1_put(id3_byte_t **ptr, id3_latin1_t latin1)
{
if (ptr)
*(*ptr)++ = latin1;
return 1;
}
/*
* NAME: latin1->get()
* DESCRIPTION: deserialize a single latin1 character
*/
id3_latin1_t id3_latin1_get(id3_byte_t const **ptr)
{
return *(*ptr)++;
}
/*
* NAME: latin1->serialize()
* DESCRIPTION: serialize a ucs4 string using latin1 encoding
*/
id3_length_t id3_latin1_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
int terminate)
{
id3_length_t size = 0;
id3_latin1_t latin1[1], *out;
while (*ucs4) {
switch (id3_latin1_encodechar(out = latin1, *ucs4++)) {
case 1: size += id3_latin1_put(ptr, *out++);
case 0: break;
}
}
if (terminate)
size += id3_latin1_put(ptr, 0);
return size;
}
/*
* NAME: latin1->deserialize()
* DESCRIPTION: deserialize a ucs4 string using latin1 encoding
*/
id3_ucs4_t *id3_latin1_deserialize(id3_byte_t const **ptr, id3_length_t length)
{
id3_byte_t const *end;
id3_latin1_t *latin1ptr, *latin1;
id3_ucs4_t *ucs4;
end = *ptr + length;
latin1 = malloc((length + 1) * sizeof(*latin1));
if (latin1 == 0)
return 0;
latin1ptr = latin1;
while (end - *ptr > 0 && (*latin1ptr = id3_latin1_get(ptr)))
++latin1ptr;
*latin1ptr = 0;
ucs4 = malloc((id3_latin1_length(latin1) + 1) * sizeof(*ucs4));
if (ucs4)
id3_latin1_decode(latin1, ucs4);
free(latin1);
return ucs4;
}
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