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Imported Upstream version 5.10.0.47
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/*
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* Latin1Encoding.cs - Implementation of the
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* "System.Text.Latin1Encoding" class.
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*
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* Copyright (c) 2002 Southern Storm Software, Pty Ltd
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a 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
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* OR 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
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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namespace System.Text
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{
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using System;
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[Serializable]
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internal class Latin1Encoding : Encoding
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{
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// until we change the callers:
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internal static string _ (string arg) {
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return arg;
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}
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// Magic number used by Windows for the ISO Latin1 code page.
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internal const int ISOLATIN_CODE_PAGE = 28591;
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// Constructor.
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public Latin1Encoding () : base (ISOLATIN_CODE_PAGE)
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{
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// Nothing to do here.
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}
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public override bool IsSingleByte {
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get { return true; }
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}
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public override bool IsAlwaysNormalized (NormalizationForm form)
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{
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return form == NormalizationForm.FormC;
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}
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// Get the number of bytes needed to encode a character buffer.
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public override int GetByteCount (char[] chars, int index, int count)
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{
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if (chars == null) {
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throw new ArgumentNullException ("chars");
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}
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if (index < 0 || index > chars.Length) {
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throw new ArgumentOutOfRangeException ("index", _("ArgRange_Array"));
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}
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if (count < 0 || count > (chars.Length - index)) {
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throw new ArgumentOutOfRangeException ("count", _("ArgRange_Array"));
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}
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return count;
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}
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// Convenience wrappers for "GetByteCount".
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public override int GetByteCount (String s)
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{
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if (s == null) {
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throw new ArgumentNullException ("s");
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}
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return s.Length;
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}
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// Get the bytes that result from encoding a character buffer.
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public override int GetBytes (char[] chars, int charIndex, int charCount,
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byte[] bytes, int byteIndex)
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{
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EncoderFallbackBuffer buffer = null;
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char [] fallback_chars = null;
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return GetBytes (chars, charIndex, charCount, bytes,
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byteIndex, ref buffer, ref fallback_chars);
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}
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int GetBytes (char[] chars, int charIndex, int charCount,
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byte[] bytes, int byteIndex,
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ref EncoderFallbackBuffer buffer,
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ref char [] fallback_chars)
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{
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if (chars == null)
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throw new ArgumentNullException ("chars");
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unsafe {
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fixed (char *cptr = chars) {
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return InternalGetBytes (cptr, chars.Length, charIndex, charCount, bytes, byteIndex, ref buffer, ref fallback_chars);
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}
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}
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}
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// Convenience wrappers for "GetBytes".
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public override int GetBytes (String s, int charIndex, int charCount,
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byte[] bytes, int byteIndex)
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{
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EncoderFallbackBuffer buffer = null;
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char [] fallback_chars = null;
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return GetBytes (s, charIndex, charCount, bytes, byteIndex,
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ref buffer, ref fallback_chars);
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}
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int GetBytes (String s, int charIndex, int charCount,
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byte[] bytes, int byteIndex,
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ref EncoderFallbackBuffer buffer,
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ref char [] fallback_chars)
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{
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if (s == null)
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throw new ArgumentNullException ("s");
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unsafe {
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fixed (char *chars = s) {
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return InternalGetBytes (chars, s.Length, charIndex, charCount, bytes, byteIndex, ref buffer, ref fallback_chars);
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}
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}
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}
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unsafe int InternalGetBytes (char *chars, int charLength, int charIndex, int charCount,
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byte[] bytes, int byteIndex,
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ref EncoderFallbackBuffer buffer,
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ref char [] fallback_chars)
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{
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if (bytes == null)
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throw new ArgumentNullException ("bytes");
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if (charIndex < 0 || charIndex > charLength)
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throw new ArgumentOutOfRangeException ("charIndex", _("ArgRange_Array"));
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if (charCount < 0 || charCount > (charLength - charIndex))
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throw new ArgumentOutOfRangeException ("charCount", _("ArgRange_Array"));
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if (byteIndex < 0 || byteIndex > bytes.Length)
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throw new ArgumentOutOfRangeException ("byteIndex", _("ArgRange_Array"));
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if ((bytes.Length - byteIndex) < charCount)
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throw new ArgumentException (_("Arg_InsufficientSpace"));
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int count = charCount;
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char ch;
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while (count-- > 0) {
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ch = chars [charIndex++];
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if (ch < (char)0x0100) {
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bytes [byteIndex++] = (byte)ch;
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} else if (ch >= '\uFF01' && ch <= '\uFF5E') {
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bytes [byteIndex++] = (byte)(ch - 0xFEE0);
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} else {
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if (buffer == null)
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buffer = EncoderFallback.CreateFallbackBuffer ();
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if (Char.IsSurrogate (ch) && count > 1 &&
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Char.IsSurrogate (chars [charIndex]))
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{
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buffer.Fallback (ch, chars [charIndex], charIndex - 1);
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charIndex++;
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count--;
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}
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else
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buffer.Fallback (ch, charIndex - 1);
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if (fallback_chars == null || fallback_chars.Length < buffer.Remaining)
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fallback_chars = new char [buffer.Remaining];
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for (int i = 0; i < fallback_chars.Length; i++)
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fallback_chars [i] = buffer.GetNextChar ();
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byteIndex += GetBytes (fallback_chars, 0,
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fallback_chars.Length, bytes, byteIndex,
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ref buffer, ref fallback_chars);
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}
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}
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return charCount;
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}
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// Get the number of characters needed to decode a byte buffer.
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public override int GetCharCount (byte[] bytes, int index, int count)
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{
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if (bytes == null) {
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throw new ArgumentNullException ("bytes");
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}
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if (index < 0 || index > bytes.Length) {
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throw new ArgumentOutOfRangeException ("index", _("ArgRange_Array"));
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}
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if (count < 0 || count > (bytes.Length - index)) {
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throw new ArgumentOutOfRangeException ("count", _("ArgRange_Array"));
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}
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return count;
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}
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// Get the characters that result from decoding a byte buffer.
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public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
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char[] chars, int charIndex)
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{
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if (bytes == null) {
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throw new ArgumentNullException ("bytes");
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}
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if (chars == null) {
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throw new ArgumentNullException ("chars");
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}
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if (byteIndex < 0 || byteIndex > bytes.Length) {
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throw new ArgumentOutOfRangeException ("byteIndex", _("ArgRange_Array"));
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}
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if (byteCount < 0 || byteCount > (bytes.Length - byteIndex)) {
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throw new ArgumentOutOfRangeException ("byteCount", _("ArgRange_Array"));
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}
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if (charIndex < 0 || charIndex > chars.Length) {
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throw new ArgumentOutOfRangeException ("charIndex", _("ArgRange_Array"));
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}
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if ((chars.Length - charIndex) < byteCount) {
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throw new ArgumentException (_("Arg_InsufficientSpace"));
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}
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int count = byteCount;
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while (count-- > 0) {
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chars [charIndex++] = (char)(bytes [byteIndex++]);
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}
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return byteCount;
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}
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// Get the maximum number of bytes needed to encode a
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// specified number of characters.
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public override int GetMaxByteCount (int charCount)
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{
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if (charCount < 0) {
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throw new ArgumentOutOfRangeException ("charCount", _("ArgRange_NonNegative"));
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}
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return charCount;
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}
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// Get the maximum number of characters needed to decode a
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// specified number of bytes.
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public override int GetMaxCharCount (int byteCount)
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{
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if (byteCount < 0) {
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throw new ArgumentOutOfRangeException ("byteCount", _("ArgRange_NonNegative"));
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}
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return byteCount;
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}
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// Decode a buffer of bytes into a string.
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public override String GetString (byte[] bytes, int index, int count)
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{
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if (bytes == null) {
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throw new ArgumentNullException ("bytes");
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}
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if (index < 0 || index > bytes.Length) {
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throw new ArgumentOutOfRangeException ("index", _("ArgRange_Array"));
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}
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if (count < 0 || count > (bytes.Length - index)) {
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throw new ArgumentOutOfRangeException ("count", _("ArgRange_Array"));
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}
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if (count == 0)
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return String.Empty;
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unsafe {
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fixed (byte* bytePtr = bytes) {
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string s = string.FastAllocateString (count);
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fixed (char* charPtr = s) {
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byte* currByte = bytePtr + index;
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byte* lastByte = currByte + count;
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char* currChar = charPtr;
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while (currByte < lastByte)
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currChar++ [0] = (char) currByte++ [0];
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}
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return s;
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}
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}
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}
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public override String GetString (byte[] bytes)
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{
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if (bytes == null) {
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throw new ArgumentNullException ("bytes");
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}
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return GetString (bytes, 0, bytes.Length);
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}
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#if !ECMA_COMPAT
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// Get the mail body name for this encoding.
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public override String BodyName
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{
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get {
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return "iso-8859-1";
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}
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}
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// Get the human-readable name for this encoding.
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public override String EncodingName
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{
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get {
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return "Western European (ISO)";
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}
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}
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// Get the mail agent header name for this encoding.
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public override String HeaderName
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{
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get {
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return "iso-8859-1";
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}
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}
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// Determine if this encoding can be displayed in a Web browser.
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public override bool IsBrowserDisplay
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{
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get {
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return true;
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}
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}
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// Determine if this encoding can be saved from a Web browser.
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public override bool IsBrowserSave
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{
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get {
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return true;
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}
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}
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// Determine if this encoding can be displayed in a mail/news agent.
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public override bool IsMailNewsDisplay
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{
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get {
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return true;
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}
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}
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// Determine if this encoding can be saved from a mail/news agent.
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public override bool IsMailNewsSave
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{
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get {
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return true;
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}
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}
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// Get the IANA-preferred Web name for this encoding.
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public override String WebName
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{
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get {
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return "iso-8859-1";
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}
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}
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#endif // !ECMA_COMPAT
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}; // class Latin1Encoding
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}; // namespace System.Text
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