comparison src/libid3tag-0.15.1b/latin1.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: 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;
+}