166 lines
7.6 KiB
C#
166 lines
7.6 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 raw strings. The raw encoding is simply the identity relation between
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/// characters and bytes. PDFsharp internally works with raw encoded strings instead of
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/// byte arrays because strings are much more handy than byte arrays.
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/// </summary>
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/// <remarks>
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/// Raw encoded strings represent an array of bytes. Therefore a character greater than
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/// 255 is not valid in a raw encoded string.
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/// </remarks>
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public sealed class RawEncoding : Encoding
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="RawEncoding"/> class.
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/// </summary>
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// ReSharper disable EmptyConstructor
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public RawEncoding()
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{ }
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// ReSharper restore EmptyConstructor
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/// <summary>
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/// When overridden in a derived class, calculates the number of bytes produced by encoding a set of characters from the specified character array.
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/// </summary>
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/// <param name="chars">The character array containing the set of characters to encode.</param>
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/// <param name="index">The index of the first character to encode.</param>
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/// <param name="count">The number of characters to encode.</param>
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/// <returns>
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/// The number of bytes produced by encoding the specified characters.
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/// </returns>
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public override int GetByteCount(char[] chars, int index, int count)
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{
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return count;
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}
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/// <summary>
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/// When overridden in a derived class, encodes a set of characters from the specified character array into the specified byte array.
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/// </summary>
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/// <param name="chars">The character array containing the set of characters to encode.</param>
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/// <param name="charIndex">The index of the first character to encode.</param>
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/// <param name="charCount">The number of characters to encode.</param>
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/// <param name="bytes">The byte array to contain the resulting sequence of bytes.</param>
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/// <param name="byteIndex">The index at which to start writing the resulting sequence of bytes.</param>
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/// <returns>
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/// The actual number of bytes written into <paramref name="bytes"/>.
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/// </returns>
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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++, byteIndex++, count--)
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{
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#if DEBUG_
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if ((uint) chars[charIndex] > 255)
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Debug-Break.Break(true);
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#endif
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//Debug.Assert((uint)chars[charIndex] < 256, "Raw string contains invalid character with a value > 255.");
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bytes[byteIndex] = (byte)chars[charIndex];
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//#warning Here is a HACK that must not be ignored!
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// HACK:
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// bytes[byteIndex] = (byte)chars[charIndex];
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}
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return charCount;
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}
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/// <summary>
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/// When overridden in a derived class, calculates the number of characters produced by decoding a sequence of bytes from the specified byte array.
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/// </summary>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <param name="index">The index of the first byte to decode.</param>
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/// <param name="count">The number of bytes to decode.</param>
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/// <returns>
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/// The number of characters produced by decoding the specified sequence of bytes.
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/// </returns>
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public override int GetCharCount(byte[] bytes, int index, int count)
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{
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return count;
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}
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/// <summary>
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/// When overridden in a derived class, decodes a sequence of bytes from the specified byte array into the specified character array.
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/// </summary>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <param name="byteIndex">The index of the first byte to decode.</param>
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/// <param name="byteCount">The number of bytes to decode.</param>
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/// <param name="chars">The character array to contain the resulting set of characters.</param>
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/// <param name="charIndex">The index at which to start writing the resulting set of characters.</param>
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/// <returns>
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/// The actual number of characters written into <paramref name="chars"/>.
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/// </returns>
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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++, charIndex++, count--)
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chars[charIndex] = (char)bytes[byteIndex];
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return byteCount;
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}
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/// <summary>
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/// When overridden in a derived class, calculates the maximum number of bytes produced by encoding the specified number of characters.
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/// </summary>
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/// <param name="charCount">The number of characters to encode.</param>
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/// <returns>
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/// The maximum number of bytes produced by encoding the specified number of characters.
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/// </returns>
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public override int GetMaxByteCount(int charCount)
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{
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return charCount;
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}
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/// <summary>
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/// When overridden in a derived class, calculates the maximum number of characters produced by decoding the specified number of bytes.
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/// </summary>
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/// <param name="byteCount">The number of bytes to decode.</param>
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/// <returns>
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/// The maximum number of characters produced by decoding the specified number of bytes.
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/// </returns>
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public override int GetMaxCharCount(int byteCount)
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{
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return byteCount;
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}
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#if SILVERLIGHT
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/// <summary>
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/// When overridden in a derived class, decodes all the bytes in the specified byte array into a string.
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/// </summary>
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/// <param name="bytes">The byte array containing the sequence of bytes to decode.</param>
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/// <returns>
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/// A <see cref="T:System.String"/> containing the results of decoding the specified sequence of bytes.
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/// </returns>
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public string GetString(byte[] bytes)
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{
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return GetString(bytes, 0, bytes.Length);
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}
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#endif
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}
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}
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