#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange
//
// Copyright (c) 2005-2019 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software. 
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE. 
#endregion

using System;
using System. Diagnostics;
using System. Collections. Generic;
using PdfSharp. Fonts. OpenType;
using PdfSharp. Pdf. Internal;

namespace PdfSharp. Fonts
{
    /// <summary>
    /// Helper class that determines the characters used in a particular font. 
    /// </summary>
    internal class CMapInfo
    {
        public CMapInfo(OpenTypeDescriptor descriptor)
        {
            Debug. Assert(descriptor ! = null);
            _descriptor = descriptor;
        }
        internal OpenTypeDescriptor _descriptor;

        /// <summary>
        /// Adds the characters of the specified string to the hashtable. 
        /// </summary>
        public void AddChars(string text)
        {
            if (text ! = null)
            {
                bool symbol = _descriptor.FontFace.cmap.symbol;
                int length = text. Length;
                for (int idx = 0; idx < length; idx++)
                {
                    char ch = text[idx];
                    if (! CharacterToGlyphIndex. ContainsKey(ch))
                    {
                        char ch2 = ch;
                        if (symbol)
                        {
                            // Remap ch for symbol fonts. 
                            ch2 = (char)(ch | (_descriptor. FontFace.os2.usFirstCharIndex & 0xFF00));  // @@@ refactor
                        }
                        int glyphIndex = _descriptor. CharCodeToGlyphIndex(ch2);
                        CharacterToGlyphIndex. Add(ch, glyphIndex);
                        GlyphIndices[glyphIndex] = null;
                        MinChar = (char)Math. Min(MinChar, ch);
                        MaxChar = (char)Math. Max(MaxChar, ch);
                    }
                }
            }
        }

        /// <summary>
        /// Adds the glyphIndices to the hashtable. 
        /// </summary>
        public void AddGlyphIndices(string glyphIndices)
        {
            if (glyphIndices ! = null)
            {
                int length = glyphIndices. Length;
                for (int idx = 0; idx < length; idx++)
                {
                    int glyphIndex = glyphIndices[idx];
                    GlyphIndices[glyphIndex] = null;
                }
            }
        }

        /// <summary>
        /// Adds a ANSI characters. 
        /// </summary>
        internal void AddAnsiChars()
        {
            byte[] ansi = new byte[256 - 32];
            for (int idx = 0; idx < 256 - 32; idx++)
                ansi[idx] = (byte)(idx + 32);
#if EDF_CORE
            string text = null; // PdfEncoders. WinAnsiEncoding. GetString(ansi, 0, ansi. Length);
#else
            string text = PdfEncoders. WinAnsiEncoding. GetString(ansi, 0, ansi. Length);
#endif
            AddChars(text);
        }

        internal bool Contains(char ch)
        {
            return CharacterToGlyphIndex. ContainsKey(ch);
        }

        public char[] Chars
        {
            get
            {
                char[] chars = new char[CharacterToGlyphIndex. Count];
                CharacterToGlyphIndex. Keys. CopyTo(chars, 0);
                Array. Sort(chars);
                return chars;
            }
        }

        public int[] GetGlyphIndices()
        {
            int[] indices = new int[GlyphIndices. Count];
            GlyphIndices. Keys. CopyTo(indices, 0);
            Array. Sort(indices);
            return indices;
        }

        public char MinChar = char. MaxValue;
        public char MaxChar = char. MinValue;
        public Dictionary<char, int> CharacterToGlyphIndex = new Dictionary<char, int>();
        public Dictionary<int, object> GlyphIndices = new Dictionary<int, object>();
    }
}
