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Diffstat (limited to 'libid3tag/utf8.c')
-rw-r--r--libid3tag/utf8.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/libid3tag/utf8.c b/libid3tag/utf8.c
new file mode 100644
index 0000000..4d8649a
--- /dev/null
+++ b/libid3tag/utf8.c
@@ -0,0 +1,365 @@
+/*
+ * 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: utf8.c,v 1.9 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 "utf8.h"
+# include "ucs4.h"
+
+/*
+ * NAME: utf8->length()
+ * DESCRIPTION: return the number of ucs4 chars represented by a utf8 string
+ */
+id3_length_t id3_utf8_length(id3_utf8_t const *utf8)
+{
+ id3_length_t length = 0;
+
+ while (*utf8) {
+ if ((utf8[0] & 0x80) == 0x00)
+ ++length;
+ else if ((utf8[0] & 0xe0) == 0xc0 &&
+ (utf8[1] & 0xc0) == 0x80) {
+ if (((utf8[0] & 0x1fL) << 6) >= 0x00000080L) {
+ ++length;
+ utf8 += 1;
+ }
+ }
+ else if ((utf8[0] & 0xf0) == 0xe0 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80) {
+ if ((((utf8[0] & 0x0fL) << 12) |
+ ((utf8[1] & 0x3fL) << 6)) >= 0x00000800L) {
+ ++length;
+ utf8 += 2;
+ }
+ }
+ else if ((utf8[0] & 0xf8) == 0xf0 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80) {
+ if ((((utf8[0] & 0x07L) << 18) |
+ ((utf8[1] & 0x3fL) << 12)) >= 0x00010000L) {
+ ++length;
+ utf8 += 3;
+ }
+ }
+ else if ((utf8[0] & 0xfc) == 0xf8 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80 &&
+ (utf8[4] & 0xc0) == 0x80) {
+ if ((((utf8[0] & 0x03L) << 24) |
+ ((utf8[0] & 0x3fL) << 18)) >= 0x00200000L) {
+ ++length;
+ utf8 += 4;
+ }
+ }
+ else if ((utf8[0] & 0xfe) == 0xfc &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80 &&
+ (utf8[4] & 0xc0) == 0x80 &&
+ (utf8[5] & 0xc0) == 0x80) {
+ if ((((utf8[0] & 0x01L) << 30) |
+ ((utf8[0] & 0x3fL) << 24)) >= 0x04000000L) {
+ ++length;
+ utf8 += 5;
+ }
+ }
+
+ ++utf8;
+ }
+
+ return length;
+}
+
+/*
+ * NAME: utf8->size()
+ * DESCRIPTION: return the encoding size of a utf8 string
+ */
+id3_length_t id3_utf8_size(id3_utf8_t const *utf8)
+{
+ id3_utf8_t const *ptr = utf8;
+
+ while (*ptr)
+ ++ptr;
+
+ return ptr - utf8 + 1;
+}
+
+/*
+ * NAME: utf8->ucs4duplicate()
+ * DESCRIPTION: duplicate and decode a utf8 string into ucs4
+ */
+id3_ucs4_t *id3_utf8_ucs4duplicate(id3_utf8_t const *utf8)
+{
+ id3_ucs4_t *ucs4;
+
+ ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
+ if (ucs4)
+ id3_utf8_decode(utf8, ucs4);
+
+ return release(ucs4);
+}
+
+/*
+ * NAME: utf8->decodechar()
+ * DESCRIPTION: decode a series of utf8 chars into a single ucs4 char
+ */
+id3_length_t id3_utf8_decodechar(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
+{
+ id3_utf8_t const *start = utf8;
+
+ while (1) {
+ if ((utf8[0] & 0x80) == 0x00) {
+ *ucs4 = utf8[0];
+ return utf8 - start + 1;
+ }
+ else if ((utf8[0] & 0xe0) == 0xc0 &&
+ (utf8[1] & 0xc0) == 0x80) {
+ *ucs4 =
+ ((utf8[0] & 0x1fL) << 6) |
+ ((utf8[1] & 0x3fL) << 0);
+ if (*ucs4 >= 0x00000080L)
+ return utf8 - start + 2;
+ }
+ else if ((utf8[0] & 0xf0) == 0xe0 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80) {
+ *ucs4 =
+ ((utf8[0] & 0x0fL) << 12) |
+ ((utf8[1] & 0x3fL) << 6) |
+ ((utf8[2] & 0x3fL) << 0);
+ if (*ucs4 >= 0x00000800L)
+ return utf8 - start + 3;
+ }
+ else if ((utf8[0] & 0xf8) == 0xf0 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80) {
+ *ucs4 =
+ ((utf8[0] & 0x07L) << 18) |
+ ((utf8[1] & 0x3fL) << 12) |
+ ((utf8[2] & 0x3fL) << 6) |
+ ((utf8[3] & 0x3fL) << 0);
+ if (*ucs4 >= 0x00010000L)
+ return utf8 - start + 4;
+ }
+ else if ((utf8[0] & 0xfc) == 0xf8 &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80 &&
+ (utf8[4] & 0xc0) == 0x80) {
+ *ucs4 =
+ ((utf8[0] & 0x03L) << 24) |
+ ((utf8[1] & 0x3fL) << 18) |
+ ((utf8[2] & 0x3fL) << 12) |
+ ((utf8[3] & 0x3fL) << 6) |
+ ((utf8[4] & 0x3fL) << 0);
+ if (*ucs4 >= 0x00200000L)
+ return utf8 - start + 5;
+ }
+ else if ((utf8[0] & 0xfe) == 0xfc &&
+ (utf8[1] & 0xc0) == 0x80 &&
+ (utf8[2] & 0xc0) == 0x80 &&
+ (utf8[3] & 0xc0) == 0x80 &&
+ (utf8[4] & 0xc0) == 0x80 &&
+ (utf8[5] & 0xc0) == 0x80) {
+ *ucs4 =
+ ((utf8[0] & 0x01L) << 30) |
+ ((utf8[1] & 0x3fL) << 24) |
+ ((utf8[2] & 0x3fL) << 18) |
+ ((utf8[3] & 0x3fL) << 12) |
+ ((utf8[4] & 0x3fL) << 6) |
+ ((utf8[5] & 0x3fL) << 0);
+ if (*ucs4 >= 0x04000000L)
+ return utf8 - start + 6;
+ }
+
+ ++utf8;
+ }
+}
+
+/*
+ * NAME: utf8->encodechar()
+ * DESCRIPTION: encode a single ucs4 char into a series of up to 6 utf8 chars
+ */
+id3_length_t id3_utf8_encodechar(id3_utf8_t *utf8, id3_ucs4_t ucs4)
+{
+ if (ucs4 <= 0x0000007fL) {
+ utf8[0] = ucs4;
+
+ return 1;
+ }
+ else if (ucs4 <= 0x000007ffL) {
+ utf8[0] = 0xc0 | ((ucs4 >> 6) & 0x1f);
+ utf8[1] = 0x80 | ((ucs4 >> 0) & 0x3f);
+
+ return 2;
+ }
+ else if (ucs4 <= 0x0000ffffL) {
+ utf8[0] = 0xe0 | ((ucs4 >> 12) & 0x0f);
+ utf8[1] = 0x80 | ((ucs4 >> 6) & 0x3f);
+ utf8[2] = 0x80 | ((ucs4 >> 0) & 0x3f);
+
+ return 3;
+ }
+ else if (ucs4 <= 0x001fffffL) {
+ utf8[0] = 0xf0 | ((ucs4 >> 18) & 0x07);
+ utf8[1] = 0x80 | ((ucs4 >> 12) & 0x3f);
+ utf8[2] = 0x80 | ((ucs4 >> 6) & 0x3f);
+ utf8[3] = 0x80 | ((ucs4 >> 0) & 0x3f);
+
+ return 4;
+ }
+ else if (ucs4 <= 0x03ffffffL) {
+ utf8[0] = 0xf8 | ((ucs4 >> 24) & 0x03);
+ utf8[1] = 0x80 | ((ucs4 >> 18) & 0x3f);
+ utf8[2] = 0x80 | ((ucs4 >> 12) & 0x3f);
+ utf8[3] = 0x80 | ((ucs4 >> 6) & 0x3f);
+ utf8[4] = 0x80 | ((ucs4 >> 0) & 0x3f);
+
+ return 5;
+ }
+ else if (ucs4 <= 0x7fffffffL) {
+ utf8[0] = 0xfc | ((ucs4 >> 30) & 0x01);
+ utf8[1] = 0x80 | ((ucs4 >> 24) & 0x3f);
+ utf8[2] = 0x80 | ((ucs4 >> 18) & 0x3f);
+ utf8[3] = 0x80 | ((ucs4 >> 12) & 0x3f);
+ utf8[4] = 0x80 | ((ucs4 >> 6) & 0x3f);
+ utf8[5] = 0x80 | ((ucs4 >> 0) & 0x3f);
+
+ return 6;
+ }
+
+ /* default */
+
+ return id3_utf8_encodechar(utf8, ID3_UCS4_REPLACEMENTCHAR);
+}
+
+/*
+ * NAME: utf8->decode()
+ * DESCRIPTION: decode a complete utf8 string into a ucs4 string
+ */
+void id3_utf8_decode(id3_utf8_t const *utf8, id3_ucs4_t *ucs4)
+{
+ do
+ utf8 += id3_utf8_decodechar(utf8, ucs4);
+ while (*ucs4++);
+}
+
+/*
+ * NAME: utf8->encode()
+ * DESCRIPTION: encode a complete ucs4 string into a utf8 string
+ */
+void id3_utf8_encode(id3_utf8_t *utf8, id3_ucs4_t const *ucs4)
+{
+ do
+ utf8 += id3_utf8_encodechar(utf8, *ucs4);
+ while (*ucs4++);
+}
+
+/*
+ * NAME: utf8->put()
+ * DESCRIPTION: serialize a single utf8 character
+ */
+id3_length_t id3_utf8_put(id3_byte_t **ptr, id3_utf8_t utf8)
+{
+ if (ptr)
+ *(*ptr)++ = utf8;
+
+ return 1;
+}
+
+/*
+ * NAME: utf8->get()
+ * DESCRIPTION: deserialize a single utf8 character
+ */
+id3_utf8_t id3_utf8_get(id3_byte_t const **ptr)
+{
+ return *(*ptr)++;
+}
+
+/*
+ * NAME: utf8->serialize()
+ * DESCRIPTION: serialize a ucs4 string using utf8 encoding
+ */
+id3_length_t id3_utf8_serialize(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
+ int terminate)
+{
+ id3_length_t size = 0;
+ id3_utf8_t utf8[6], *out;
+
+ while (*ucs4) {
+ switch (id3_utf8_encodechar(out = utf8, *ucs4++)) {
+ case 6: size += id3_utf8_put(ptr, *out++);
+ case 5: size += id3_utf8_put(ptr, *out++);
+ case 4: size += id3_utf8_put(ptr, *out++);
+ case 3: size += id3_utf8_put(ptr, *out++);
+ case 2: size += id3_utf8_put(ptr, *out++);
+ case 1: size += id3_utf8_put(ptr, *out++);
+ case 0: break;
+ }
+ }
+
+ if (terminate)
+ size += id3_utf8_put(ptr, 0);
+
+ return size;
+}
+
+/*
+ * NAME: utf8->deserialize()
+ * DESCRIPTION: deserialize a ucs4 string using utf8 encoding
+ */
+id3_ucs4_t *id3_utf8_deserialize(id3_byte_t const **ptr, id3_length_t length)
+{
+ id3_byte_t const *end;
+ id3_utf8_t *utf8ptr, *utf8;
+ id3_ucs4_t *ucs4;
+
+ end = *ptr + length;
+
+ utf8 = malloc((length + 1) * sizeof(*utf8));
+ if (utf8 == 0)
+ return 0;
+
+ utf8ptr = utf8;
+ while (end - *ptr > 0 && (*utf8ptr = id3_utf8_get(ptr)))
+ ++utf8ptr;
+
+ *utf8ptr = 0;
+
+ ucs4 = malloc((id3_utf8_length(utf8) + 1) * sizeof(*ucs4));
+ if (ucs4)
+ id3_utf8_decode(utf8, ucs4);
+
+ free(utf8);
+
+ return ucs4;
+}

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