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