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-rw-r--r--src/libid3tag/utf16.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/src/libid3tag/utf16.c b/src/libid3tag/utf16.c
new file mode 100644
index 000000000..8b8f47934
--- /dev/null
+++ b/src/libid3tag/utf16.c
@@ -0,0 +1,286 @@
+/*
+ * libid3tag - ID3 tag manipulation library
+ * Copyright (C) 2000-2003 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: utf16.c,v 1.1 2003/08/14 03:57:13 shank Exp $
+ */
+
+# ifdef HAVE_CONFIG_H
+# include "config.h"
+# endif
+
+# include "global.h"
+
+# include <stdlib.h>
+
+# include "id3tag.h"
+# include "utf16.h"
+# include "ucs4.h"
+
+/*
+ * NAME: utf16->length()
+ * DESCRIPTION: return the number of ucs4 chars represented by a utf16 string
+ */
+id3_length_t id3_utf16_length(id3_utf16_t const *utf16)
+{
+ id3_length_t length = 0;
+
+ while (*utf16) {
+ if (utf16[0] < 0xd800 || utf16[0] > 0xdfff)
+ ++length;
+ else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff &&
+ utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) {
+ ++length;
+ ++utf16;
+ }
+
+ ++utf16;
+ }
+
+ return length;
+}
+
+/*
+ * NAME: utf16->size()
+ * DESCRIPTION: return the encoding size of a utf16 string
+ */
+id3_length_t id3_utf16_size(id3_utf16_t const *utf16)
+{
+ id3_utf16_t const *ptr = utf16;
+
+ while (*ptr)
+ ++ptr;
+
+ return ptr - utf16 + 1;
+}
+
+/*
+ * NAME: utf16->ucs4duplicate()
+ * DESCRIPTION: duplicate and decode a utf16 string into ucs4
+ */
+id3_ucs4_t *id3_utf16_ucs4duplicate(id3_utf16_t const *utf16)
+{
+ id3_ucs4_t *ucs4;
+
+ ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4));
+ if (ucs4)
+ id3_utf16_decode(utf16, ucs4);
+
+ return release(ucs4);
+}
+
+/*
+ * NAME: utf16->decodechar()
+ * DESCRIPTION: decode a series of utf16 chars into a single ucs4 char
+ */
+id3_length_t id3_utf16_decodechar(id3_utf16_t const *utf16, id3_ucs4_t *ucs4)
+{
+ id3_utf16_t const *start = utf16;
+
+ while (1) {
+ if (utf16[0] < 0xd800 || utf16[0] > 0xdfff) {
+ *ucs4 = utf16[0];
+ return utf16 - start + 1;
+ }
+ else if (utf16[0] >= 0xd800 && utf16[0] <= 0xdbff &&
+ utf16[1] >= 0xdc00 && utf16[1] <= 0xdfff) {
+ *ucs4 = (((utf16[0] & 0x03ffL) << 10) |
+ ((utf16[1] & 0x03ffL) << 0)) + 0x00010000L;
+ return utf16 - start + 2;
+ }
+
+ ++utf16;
+ }
+}
+
+/*
+ * NAME: utf16->encodechar()
+ * DESCRIPTION: encode a single ucs4 char into a series of up to 2 utf16 chars
+ */
+id3_length_t id3_utf16_encodechar(id3_utf16_t *utf16, id3_ucs4_t ucs4)
+{
+ if (ucs4 < 0x00010000L) {
+ utf16[0] = ucs4;
+
+ return 1;
+ }
+ else if (ucs4 < 0x00110000L) {
+ ucs4 -= 0x00010000L;
+
+ utf16[0] = ((ucs4 >> 10) & 0x3ff) | 0xd800;
+ utf16[1] = ((ucs4 >> 0) & 0x3ff) | 0xdc00;
+
+ return 2;
+ }
+
+ /* default */
+
+ return id3_utf16_encodechar(utf16, ID3_UCS4_REPLACEMENTCHAR);
+}
+
+/*
+ * NAME: utf16->decode()
+ * DESCRIPTION: decode a complete utf16 string into a ucs4 string
+ */
+void id3_utf16_decode(id3_utf16_t const *utf16, id3_ucs4_t *ucs4)
+{
+ do
+ utf16 += id3_utf16_decodechar(utf16, ucs4);
+ while (*ucs4++);
+}
+
+/*
+ * NAME: utf16->encode()
+ * DESCRIPTION: encode a complete ucs4 string into a utf16 string
+ */
+void id3_utf16_encode(id3_utf16_t *utf16, id3_ucs4_t const *ucs4)
+{
+ do
+ utf16 += id3_utf16_encodechar(utf16, *ucs4);
+ while (*ucs4++);
+}
+
+/*
+ * NAME: utf16->put()
+ * DESCRIPTION: serialize a single utf16 character
+ */
+id3_length_t id3_utf16_put(id3_byte_t **ptr, id3_utf16_t utf16,
+ enum id3_utf16_byteorder byteorder)
+{
+ if (ptr) {
+ switch (byteorder) {
+ default:
+ case ID3_UTF16_BYTEORDER_BE:
+ (*ptr)[0] = (utf16 >> 8) & 0xff;
+ (*ptr)[1] = (utf16 >> 0) & 0xff;
+ break;
+
+ case ID3_UTF16_BYTEORDER_LE:
+ (*ptr)[0] = (utf16 >> 0) & 0xff;
+ (*ptr)[1] = (utf16 >> 8) & 0xff;
+ break;
+ }
+
+ *ptr += 2;
+ }
+
+ return 2;
+}
+
+/*
+ * NAME: utf16->get()
+ * DESCRIPTION: deserialize a single utf16 character
+ */
+id3_utf16_t id3_utf16_get(id3_byte_t const **ptr,
+ enum id3_utf16_byteorder byteorder)
+{
+ id3_utf16_t utf16;
+
+ switch (byteorder) {
+ default:
+ case ID3_UTF16_BYTEORDER_BE:
+ utf16 =
+ ((*ptr)[0] << 8) |
+ ((*ptr)[1] << 0);
+ break;
+
+ case ID3_UTF16_BYTEORDER_LE:
+ utf16 =
+ ((*ptr)[0] << 0) |
+ ((*ptr)[1] << 8);
+ break;
+ }
+
+ *ptr += 2;
+
+ return utf16;
+}
+
+/*
+ * NAME: utf16->serialize()
+ * DESCRIPTION: serialize a ucs4 string using utf16 encoding
+ */
+id3_length_t id3_utf16_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
+ enum id3_utf16_byteorder byteorder,
+ int terminate)
+{
+ id3_length_t size = 0;
+ id3_utf16_t utf16[2], *out;
+
+ if (byteorder == ID3_UTF16_BYTEORDER_ANY)
+ size += id3_utf16_put(ptr, 0xfeff, byteorder);
+
+ while (*ucs4) {
+ switch (id3_utf16_encodechar(out = utf16, *ucs4++)) {
+ case 2: size += id3_utf16_put(ptr, *out++, byteorder);
+ case 1: size += id3_utf16_put(ptr, *out++, byteorder);
+ case 0: break;
+ }
+ }
+
+ if (terminate)
+ size += id3_utf16_put(ptr, 0, byteorder);
+
+ return size;
+}
+
+/*
+ * NAME: utf16->deserialize()
+ * DESCRIPTION: deserialize a ucs4 string using utf16 encoding
+ */
+id3_ucs4_t *id3_utf16_deserialize(id3_byte_t const **ptr, id3_length_t length,
+ enum id3_utf16_byteorder byteorder)
+{
+ id3_byte_t const *end;
+ id3_utf16_t *utf16ptr, *utf16;
+ id3_ucs4_t *ucs4;
+
+ end = *ptr + (length & ~1);
+
+ utf16 = malloc((length / 2 + 1) * sizeof(*utf16));
+ if (utf16 == 0)
+ return 0;
+
+ if (byteorder == ID3_UTF16_BYTEORDER_ANY && end - *ptr > 0) {
+ switch (((*ptr)[0] << 8) |
+ ((*ptr)[1] << 0)) {
+ case 0xfeff:
+ byteorder = ID3_UTF16_BYTEORDER_BE;
+ *ptr += 2;
+ break;
+
+ case 0xfffe:
+ byteorder = ID3_UTF16_BYTEORDER_LE;
+ *ptr += 2;
+ break;
+ }
+ }
+
+ utf16ptr = utf16;
+ while (end - *ptr > 0 && (*utf16ptr = id3_utf16_get(ptr, byteorder)))
+ ++utf16ptr;
+
+ *utf16ptr = 0;
+
+ ucs4 = malloc((id3_utf16_length(utf16) + 1) * sizeof(*ucs4));
+ if (ucs4)
+ id3_utf16_decode(utf16, ucs4);
+
+ free(utf16);
+
+ return ucs4;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-03 20:58:37 +0000