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libid3tag/render.c

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+/*
+ * 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: render.c,v 1.11 2004/01/23 09:41:32 rob Exp $
+ */
+
+# ifdef HAVE_CONFIG_H
+#  include "config.h"
+# endif
+
+# include "global.h"
+
+# include <string.h>
+# include <stdlib.h>
+
+# ifdef HAVE_ASSERT_H
+#  include <assert.h>
+# endif
+
+# include "id3tag.h"
+# include "render.h"
+# include "ucs4.h"
+# include "latin1.h"
+# include "utf16.h"
+# include "utf8.h"
+
+id3_length_t id3_render_immediate(id3_byte_t **ptr,
+				  char const *value, unsigned int bytes)
+{
+  assert(value);
+  assert(bytes == 8 || bytes == 4 || bytes == 3);
+
+  if (ptr) {
+    switch (bytes) {
+    case 8: *(*ptr)++ = *value++;
+            *(*ptr)++ = *value++;
+	    *(*ptr)++ = *value++;
+	    *(*ptr)++ = *value++;
+    case 4: *(*ptr)++ = *value++;
+    case 3: *(*ptr)++ = *value++;
+            *(*ptr)++ = *value++;
+	    *(*ptr)++ = *value++;
+    }
+  }
+
+  return bytes;
+}
+
+id3_length_t id3_render_syncsafe(id3_byte_t **ptr,
+				 unsigned long num, unsigned int bytes)
+{
+  assert(bytes == 4 || bytes == 5);
+
+  if (ptr) {
+    switch (bytes) {
+    case 5: *(*ptr)++ = (num >> 28) & 0x0f;
+    case 4: *(*ptr)++ = (num >> 21) & 0x7f;
+            *(*ptr)++ = (num >> 14) & 0x7f;
+	    *(*ptr)++ = (num >>  7) & 0x7f;
+	    *(*ptr)++ = (num >>  0) & 0x7f;
+    }
+  }
+
+  return bytes;
+}
+
+id3_length_t id3_render_int(id3_byte_t **ptr,
+			    signed long num, unsigned int bytes)
+{
+  assert(bytes >= 1 && bytes <= 4);
+
+  if (ptr) {
+    switch (bytes) {
+    case 4: *(*ptr)++ = num >> 24;
+    case 3: *(*ptr)++ = num >> 16;
+    case 2: *(*ptr)++ = num >>  8;
+    case 1: *(*ptr)++ = num >>  0;
+    }
+  }
+
+  return bytes;
+}
+
+id3_length_t id3_render_binary(id3_byte_t **ptr,
+			       id3_byte_t const *data, id3_length_t length)
+{
+  if (data == 0)
+    return 0;
+
+  if (ptr) {
+    memcpy(*ptr, data, length);
+    *ptr += length;
+  }
+
+  return length;
+}
+
+id3_length_t id3_render_latin1(id3_byte_t **ptr,
+			       id3_latin1_t const *latin1, int terminate)
+{
+  id3_length_t size;
+
+  if (latin1 == 0)
+    latin1 = "";
+
+  size = id3_latin1_size(latin1);
+  if (!terminate)
+    --size;
+
+  if (ptr) {
+    memcpy(*ptr, latin1, size);
+    *ptr += size;
+  }
+
+  return size;
+}
+
+id3_length_t id3_render_string(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
+			       enum id3_field_textencoding encoding,
+			       int terminate)
+{
+  enum id3_utf16_byteorder byteorder = ID3_UTF16_BYTEORDER_ANY;
+
+  if (ucs4 == 0)
+    ucs4 = id3_ucs4_empty;
+
+  switch (encoding) {
+  case ID3_FIELD_TEXTENCODING_ISO_8859_1:
+    return id3_latin1_serialize(ptr, ucs4, terminate);
+
+  case ID3_FIELD_TEXTENCODING_UTF_16BE:
+    byteorder = ID3_UTF16_BYTEORDER_BE;
+  case ID3_FIELD_TEXTENCODING_UTF_16:
+    return id3_utf16_serialize(ptr, ucs4, byteorder, terminate);
+
+  case ID3_FIELD_TEXTENCODING_UTF_8:
+    return id3_utf8_serialize(ptr, ucs4, terminate);
+  }
+
+  return 0;
+}
+
+id3_length_t id3_render_padding(id3_byte_t **ptr, id3_byte_t value,
+				id3_length_t length)
+{
+  if (ptr) {
+    memset(*ptr, value, length);
+    *ptr += length;
+  }
+
+  return length;
+}
+
+/*
+ * NAME:	render->paddedstring()
+ * DESCRIPTION:	render a space-padded string using latin1 encoding
+ */
+id3_length_t id3_render_paddedstring(id3_byte_t **ptr, id3_ucs4_t const *ucs4,
+				     id3_length_t length)
+{
+  id3_ucs4_t padded[31], *data, *end;
+
+  /* latin1 encoding only (this is used for ID3v1 fields) */
+
+  assert(length <= 30);
+
+  data = padded;
+  end  = data + length;
+
+  if (ucs4) {
+    while (*ucs4 && end - data > 0) {
+      *data++ = *ucs4++;
+
+      if (data[-1] == '\n')
+	data[-1] = ' ';
+    }
+  }
+
+  while (end - data > 0)
+    *data++ = ' ';
+
+  *data = 0;
+
+  return id3_latin1_serialize(ptr, padded, 0);
+}