comparison src/libid3tag-0.15.1b/utf8.c @ 85:545efbb81310

Import initial set of sources

+/*
+ * 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;
+}