287 lines
6.2 KiB
C
287 lines
6.2 KiB
C
/*
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* libid3tag - ID3 tag manipulation library
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* Copyright (C) 2000-2004 Underbit Technologies, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: utf16.c,v 1.9 2004/01/23 09:41:32 rob Exp $
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*/
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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# include "global.h"
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# include <stdlib.h>
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# include "id3tag.h"
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# include "utf16.h"
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# include "ucs4.h"
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/*
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* NAME: utf16->length()
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* DESCRIPTION: return the number of ucs4 chars represented by a utf16 string
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*/
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id3_length_t id3_utf16_length(id3_utf16_t const *utf16)
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{
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id3_length_t length = 0;
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while (*utf16) {
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if (utf16[0] < 0xd800 || utf16[0] > 0xdfff)
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++length;
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else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff &&
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utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) {
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++length;
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++utf16;
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}
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++utf16;
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}
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return length;
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}
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/*
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* NAME: utf16->size()
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* DESCRIPTION: return the encoding size of a utf16 string
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*/
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id3_length_t id3_utf16_size(id3_utf16_t const *utf16)
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{
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id3_utf16_t const *ptr = utf16;
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while (*ptr)
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++ptr;
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return ptr - utf16 + 1;
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}
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/*
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* NAME: utf16->ucs4duplicate()
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* DESCRIPTION: duplicate and decode a utf16 string into ucs4
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*/
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id3_ucs4_t *id3_utf16_ucs4duplicate(id3_utf16_t const *utf16)
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{
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id3_ucs4_t *ucs4;
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ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4));
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if (ucs4)
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id3_utf16_decode(utf16, ucs4);
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return release(ucs4);
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}
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/*
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* NAME: utf16->decodechar()
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* DESCRIPTION: decode a series of utf16 chars into a single ucs4 char
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*/
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id3_length_t id3_utf16_decodechar(id3_utf16_t const *utf16, id3_ucs4_t *ucs4)
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{
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id3_utf16_t const *start = utf16;
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while (1) {
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if (utf16[0] < 0xd800 || utf16[0] > 0xdfff) {
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*ucs4 = utf16[0];
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return utf16 - start + 1;
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}
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else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff &&
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utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) {
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*ucs4 = (((utf16[0] & 0x03ffL) << 10) |
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((utf16[1] & 0x03ffL) << 0)) + 0x00010000L;
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return utf16 - start + 2;
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}
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++utf16;
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}
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}
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/*
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* NAME: utf16->encodechar()
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* DESCRIPTION: encode a single ucs4 char into a series of up to 2 utf16 chars
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*/
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id3_length_t id3_utf16_encodechar(id3_utf16_t *utf16, id3_ucs4_t ucs4)
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{
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if (ucs4 < 0x00010000L) {
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utf16[0] = ucs4;
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return 1;
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}
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else if (ucs4 < 0x00110000L) {
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ucs4 -= 0x00010000L;
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utf16[0] = ((ucs4 >> 10) & 0x3ff) | 0xd800;
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utf16[1] = ((ucs4 >> 0) & 0x3ff) | 0xdc00;
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return 2;
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}
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/* default */
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return id3_utf16_encodechar(utf16, ID3_UCS4_REPLACEMENTCHAR);
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}
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/*
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* NAME: utf16->decode()
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* DESCRIPTION: decode a complete utf16 string into a ucs4 string
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*/
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void id3_utf16_decode(id3_utf16_t const *utf16, id3_ucs4_t *ucs4)
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{
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do
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utf16 += id3_utf16_decodechar(utf16, ucs4);
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while (*ucs4++);
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}
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/*
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* NAME: utf16->encode()
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* DESCRIPTION: encode a complete ucs4 string into a utf16 string
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*/
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void id3_utf16_encode(id3_utf16_t *utf16, id3_ucs4_t const *ucs4)
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{
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do
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utf16 += id3_utf16_encodechar(utf16, *ucs4);
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while (*ucs4++);
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}
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/*
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* NAME: utf16->put()
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* DESCRIPTION: serialize a single utf16 character
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*/
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id3_length_t id3_utf16_put(id3_byte_t **ptr, id3_utf16_t utf16,
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enum id3_utf16_byteorder byteorder)
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{
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if (ptr) {
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switch (byteorder) {
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default:
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case ID3_UTF16_BYTEORDER_BE:
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(*ptr)[0] = (utf16 >> 8) & 0xff;
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(*ptr)[1] = (utf16 >> 0) & 0xff;
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break;
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case ID3_UTF16_BYTEORDER_LE:
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(*ptr)[0] = (utf16 >> 0) & 0xff;
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(*ptr)[1] = (utf16 >> 8) & 0xff;
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break;
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}
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*ptr += 2;
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}
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return 2;
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}
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/*
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* NAME: utf16->get()
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* DESCRIPTION: deserialize a single utf16 character
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*/
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id3_utf16_t id3_utf16_get(id3_byte_t const **ptr,
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enum id3_utf16_byteorder byteorder)
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{
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id3_utf16_t utf16;
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switch (byteorder) {
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default:
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case ID3_UTF16_BYTEORDER_BE:
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utf16 =
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((*ptr)[0] << 8) |
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((*ptr)[1] << 0);
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break;
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case ID3_UTF16_BYTEORDER_LE:
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utf16 =
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((*ptr)[0] << 0) |
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((*ptr)[1] << 8);
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break;
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}
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*ptr += 2;
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return utf16;
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}
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/*
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* NAME: utf16->serialize()
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* DESCRIPTION: serialize a ucs4 string using utf16 encoding
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*/
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id3_length_t id3_utf16_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
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enum id3_utf16_byteorder byteorder,
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int terminate)
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{
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id3_length_t size = 0;
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id3_utf16_t utf16[2], *out;
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if (byteorder == ID3_UTF16_BYTEORDER_ANY)
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size += id3_utf16_put(ptr, 0xfeff, byteorder);
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while (*ucs4) {
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switch (id3_utf16_encodechar(out = utf16, *ucs4++)) {
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case 2: size += id3_utf16_put(ptr, *out++, byteorder);
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case 1: size += id3_utf16_put(ptr, *out++, byteorder);
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case 0: break;
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}
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}
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if (terminate)
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size += id3_utf16_put(ptr, 0, byteorder);
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return size;
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}
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/*
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* NAME: utf16->deserialize()
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* DESCRIPTION: deserialize a ucs4 string using utf16 encoding
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*/
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id3_ucs4_t *id3_utf16_deserialize(id3_byte_t const **ptr, id3_length_t length,
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enum id3_utf16_byteorder byteorder)
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{
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id3_byte_t const *end;
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id3_utf16_t *utf16ptr, *utf16;
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id3_ucs4_t *ucs4;
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end = *ptr + (length & ~1);
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utf16 = malloc((length / 2 + 1) * sizeof(*utf16));
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if (utf16 == 0)
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return 0;
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if (byteorder == ID3_UTF16_BYTEORDER_ANY && end - *ptr > 0) {
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switch (((*ptr)[0] << 8) |
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((*ptr)[1] << 0)) {
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case 0xfeff:
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byteorder = ID3_UTF16_BYTEORDER_BE;
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*ptr += 2;
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break;
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case 0xfffe:
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byteorder = ID3_UTF16_BYTEORDER_LE;
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*ptr += 2;
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break;
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}
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}
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utf16ptr = utf16;
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while (end - *ptr > 0 && (*utf16ptr = id3_utf16_get(ptr, byteorder)))
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++utf16ptr;
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*utf16ptr = 0;
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ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4));
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if (ucs4)
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id3_utf16_decode(utf16, ucs4);
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free(utf16);
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return ucs4;
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}
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