text: /*
   * 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);
  }
  