85 lines
2.9 KiB
C#
85 lines
2.9 KiB
C#
#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System.Text;
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namespace PdfSharp.Pdf.Internal
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{
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/// <summary>
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/// An encoder for Unicode strings.
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/// (That means, a character represents a glyph index.)
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/// </summary>
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internal sealed class RawUnicodeEncoding : Encoding
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{
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public RawUnicodeEncoding()
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{ }
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public override int GetByteCount(char[] chars, int index, int count)
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{
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// Each character represents exactly an ushort value, which is a glyph index.
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return 2 * count;
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}
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public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
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{
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for (int count = charCount; count > 0; charIndex++, count--)
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{
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char ch = chars[charIndex];
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bytes[byteIndex++] = (byte)(ch >> 8);
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bytes[byteIndex++] = (byte)ch;
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}
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return charCount * 2;
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}
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public override int GetCharCount(byte[] bytes, int index, int count)
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{
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return count / 2;
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}
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public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
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{
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for (int count = byteCount; count > 0; byteIndex += 2, charIndex++, count--)
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{
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chars[charIndex] = (char)((int)bytes[byteIndex] << 8 + (int)bytes[byteIndex + 1]);
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}
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return byteCount;
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}
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public override int GetMaxByteCount(int charCount)
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{
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return charCount * 2;
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}
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public override int GetMaxCharCount(int byteCount)
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{
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return byteCount / 2;
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}
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}
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}
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