-//
-// System.Text.UTF8Encoding.cs
-//
-// Author:
-// Sean MacIsaac (macisaac@ximian.com)
-//
-// (C) Ximian, Inc. http://www.ximian.com
-//
-
-
-namespace System.Text {
-
- public class UTF8Encoding : Encoding {
- public override int GetByteCount(char[] chars, int index, int count) {
- // FIXME
- return 0;
- }
-
- public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex) {
- // FIXME
- return 0;
- }
-
- public override char[] GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex) {
- // FIXME
- return null;
- }
-
- public override int GetMaxByteCount(int charCount) {
- // FIXME
- return 0;
- }
-
- public override int GetMaxCharCount(int byteCount) {
- // FIXME
- return 0;
- }
- }
-}
+/*
+ * UTF8Encoding.cs - Implementation of the "System.Text.UTF8Encoding" class.
+ *
+ * Copyright (c) 2001, 2002 Southern Storm Software, Pty Ltd
+ * Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+ *
+ * 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]
+[MonoTODO ("Fix serialization compatibility with MS.NET")]
+#if NET_2_0
+[MonoTODO ("EncoderFallback is not handled")]
+#endif
+public class UTF8Encoding : Encoding
+{
+ // Magic number used by Windows for UTF-8.
+ internal const int UTF8_CODE_PAGE = 65001;
+
+ // Internal state.
+ private bool emitIdentifier;
+#if !NET_2_0
+ private bool throwOnInvalid;
+#endif
+
+ // Constructors.
+ public UTF8Encoding () : this (false, false) {}
+ public UTF8Encoding (bool encoderShouldEmitUTF8Identifier)
+ : this (encoderShouldEmitUTF8Identifier, false) {}
+
+ public UTF8Encoding (bool encoderShouldEmitUTF8Identifier, bool throwOnInvalidBytes)
+ : base (UTF8_CODE_PAGE)
+ {
+ emitIdentifier = encoderShouldEmitUTF8Identifier;
+#if NET_2_0
+ if (throwOnInvalidBytes)
+ SetFallbackInternal (null, new DecoderExceptionFallback ());
+ else
+ SetFallbackInternal (null, new DecoderReplacementFallback (String.Empty));
+#else
+ throwOnInvalid = throwOnInvalidBytes;
+#endif
+
+ web_name = body_name = header_name = "utf-8";
+ encoding_name = "Unicode (UTF-8)";
+ is_browser_save = true;
+ is_browser_display = true;
+ is_mail_news_display = true;
+ windows_code_page = UnicodeEncoding.UNICODE_CODE_PAGE;
+ }
+
+ // Internal version of "GetByteCount" which can handle a rolling
+ // state between multiple calls to this method.
+ private static int InternalGetByteCount (char[] chars, int index, int count, uint leftOver, bool flush)
+ {
+ // Validate the parameters.
+ 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"));
+ }
+
+ // Determine the lengths of all characters.
+ char ch;
+ int length = 0;
+ uint pair = leftOver;
+ while (count > 0) {
+ ch = chars[index];
+ if (pair == 0) {
+ if (ch < '\u0080') {
+ ++length;
+ } else if (ch < '\u0800') {
+ length += 2;
+ } else if (ch >= '\uD800' && ch <= '\uDBFF') {
+ // This is the start of a surrogate pair.
+ pair = (uint)ch;
+ } else {
+ length += 3;
+ }
+ } else if (ch >= '\uDC00' && ch <= '\uDFFF') {
+ // We have a surrogate pair.
+ length += 4;
+ pair = 0;
+ } else {
+ // We have a surrogate start followed by a
+ // regular character. Technically, this is
+ // invalid, but we have to do something.
+ // We write out the surrogate start and then
+ // re-visit the current character again.
+ length += 3;
+ pair = 0;
+ continue;
+ }
+ ++index;
+ --count;
+ }
+ if (flush && pair != 0) {
+ // Flush the left-over surrogate pair start.
+ length += 3;
+ }
+
+ // Return the final length to the caller.
+ return length;
+ }
+
+ // Get the number of bytes needed to encode a character buffer.
+ public override int GetByteCount (char[] chars, int index, int count)
+ {
+ return InternalGetByteCount (chars, index, count, 0, true);
+ }
+
+ // Convenience wrappers for "GetByteCount".
+ public override int GetByteCount (String s)
+ {
+ // Validate the parameters.
+ if (s == null) {
+ throw new ArgumentNullException ("s");
+ }
+
+ // Determine the lengths of all characters.
+ char ch;
+ int index = 0;
+ int count = s.Length;
+ int length = 0;
+ uint pair;
+ while (count > 0) {
+ ch = s[index++];
+ if (ch < '\u0080') {
+ ++length;
+ } else if (ch < '\u0800') {
+ length += 2;
+ } else if (ch >= '\uD800' && ch <= '\uDBFF' && count > 1) {
+ // This may be the start of a surrogate pair.
+ pair = (uint)(s[index]);
+ if (pair >= (uint)0xDC00 && pair <= (uint)0xDFFF) {
+ length += 4;
+ ++index;
+ --count;
+ } else {
+ length += 3;
+ }
+ } else {
+ length += 3;
+ }
+ --count;
+ }
+
+ // Return the final length to the caller.
+ return length;
+ }
+
+ // Internal version of "GetBytes" which can handle a rolling
+ // state between multiple calls to this method.
+ private static int InternalGetBytes (char[] chars, int charIndex,
+ int charCount, byte[] bytes,
+ int byteIndex, ref uint leftOver,
+ bool flush)
+ {
+ // Validate the parameters.
+ if (chars == null) {
+ throw new ArgumentNullException ("chars");
+ }
+ if (bytes == null) {
+ throw new ArgumentNullException ("bytes");
+ }
+ if (charIndex < 0 || charIndex > chars.Length) {
+ throw new ArgumentOutOfRangeException ("charIndex", _("ArgRange_Array"));
+ }
+ if (charCount < 0 || charCount > (chars.Length - charIndex)) {
+ throw new ArgumentOutOfRangeException ("charCount", _("ArgRange_Array"));
+ }
+ if (byteIndex < 0 || byteIndex > bytes.Length) {
+ throw new ArgumentOutOfRangeException ("byteIndex", _("ArgRange_Array"));
+ }
+
+ // Convert the characters into bytes.
+ char ch;
+ int length = bytes.Length;
+ uint pair;
+ uint left = leftOver;
+ int posn = byteIndex;
+ while (charCount > 0) {
+ // Fetch the next UTF-16 character pair value.
+ ch = chars[charIndex++];
+ --charCount;
+ if (left == 0) {
+ if (ch >= '\uD800' && ch <= '\uDBFF') {
+ // This is the start of a surrogate pair.
+ left = (uint)ch;
+ continue;
+ } else {
+ // This is a regular character.
+ pair = (uint)ch;
+ }
+ } else if (ch >= '\uDC00' && ch <= '\uDFFF') {
+ // We have a surrogate pair.
+ pair = ((left - (uint)0xD800) << 10) +
+ (((uint)ch) - (uint)0xDC00) +
+ (uint)0x10000;
+ left = 0;
+ } else {
+ // We have a surrogate start followed by a
+ // regular character. Technically, this is
+ // invalid, but we have to do something.
+ // We write out the surrogate start and then
+ // re-visit the current character again.
+ pair = (uint)left;
+ left = 0;
+ --charIndex;
+ ++charCount;
+ }
+
+ // Encode the character pair value.
+ if (pair < (uint)0x0080) {
+ if (posn >= length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)pair;
+ } else if (pair < (uint)0x0800) {
+ if ((posn + 2) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xC0 | (pair >> 6));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ } else if (pair < (uint)0x10000) {
+ if ((posn + 3) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xE0 | (pair >> 12));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 6) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ } else {
+ if ((posn + 4) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xF0 | (pair >> 18));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 12) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 6) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ }
+ }
+ if (flush && left != 0) {
+ // Flush the left-over surrogate pair start.
+ if ((posn + 3) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xE0 | (left >> 12));
+ bytes[posn++] = (byte)(0x80 | ((left >> 6) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | (left & 0x3F));
+ left = 0;
+ }
+ leftOver = left;
+
+ // Return the final count to the caller.
+ return posn - byteIndex;
+ }
+
+ // Get the bytes that result from encoding a character buffer.
+ public override int GetBytes (char[] chars, int charIndex, int charCount,
+ byte[] bytes, int byteIndex)
+ {
+ uint leftOver = 0;
+ return InternalGetBytes (chars, charIndex, charCount, bytes, byteIndex, ref leftOver, true);
+ }
+
+ // Convenience wrappers for "GetBytes".
+ public override int GetBytes (String s, int charIndex, int charCount,
+ byte[] bytes, int byteIndex)
+ {
+ // Validate the parameters.
+ if (s == null) {
+ throw new ArgumentNullException ("s");
+ }
+ if (bytes == null) {
+ throw new ArgumentNullException ("bytes");
+ }
+ if (charIndex < 0 || charIndex > s.Length) {
+ throw new ArgumentOutOfRangeException ("charIndex", _("ArgRange_StringIndex"));
+ }
+ if (charCount < 0 || charCount > (s.Length - charIndex)) {
+ throw new ArgumentOutOfRangeException ("charCount", _("ArgRange_StringRange"));
+ }
+ if (byteIndex < 0 || byteIndex > bytes.Length) {
+ throw new ArgumentOutOfRangeException ("byteIndex", _("ArgRange_Array"));
+ }
+
+ // Convert the characters into bytes.
+ char ch;
+ int length = bytes.Length;
+ uint pair;
+ int posn = byteIndex;
+ while (charCount > 0) {
+ // Fetch the next UTF-16 character pair value.
+ ch = s[charIndex++];
+ if (ch >= '\uD800' && ch <= '\uDBFF' && charCount > 1) {
+ // This may be the start of a surrogate pair.
+ pair = (uint)(s[charIndex]);
+ if (pair >= (uint)0xDC00 && pair <= (uint)0xDFFF) {
+ pair = (pair - (uint)0xDC00) +
+ ((((uint)ch) - (uint)0xD800) << 10) +
+ (uint)0x10000;
+ ++charIndex;
+ --charCount;
+ } else {
+ pair = (uint)ch;
+ }
+ } else {
+ pair = (uint)ch;
+ }
+ --charCount;
+
+ // Encode the character pair value.
+ if (pair < (uint)0x0080) {
+ if (posn >= length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)pair;
+ } else if (pair < (uint)0x0800) {
+ if ((posn + 2) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xC0 | (pair >> 6));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ } else if (pair < (uint)0x10000) {
+ if ((posn + 3) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xE0 | (pair >> 12));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 6) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ } else {
+ if ((posn + 4) > length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "bytes");
+ }
+ bytes[posn++] = (byte)(0xF0 | (pair >> 18));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 12) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | ((pair >> 6) & 0x3F));
+ bytes[posn++] = (byte)(0x80 | (pair & 0x3F));
+ }
+ }
+
+ // Return the final count to the caller.
+ return posn - byteIndex;
+ }
+
+ // Internal version of "GetCharCount" which can handle a rolling
+ // state between multiple calls to this method.
+#if NET_2_0
+ // Internal version of "GetCharCount" which can handle a rolling
+ // state between multiple calls to this method.
+ private static int InternalGetCharCount (
+ byte[] bytes, int index, int count, uint leftOverBits,
+ uint leftOverCount, DecoderFallbackBuffer fallbackBuffer, bool flush)
+#else
+ private static int InternalGetCharCount (
+ byte[] bytes, int index, int count, uint leftOverBits,
+ uint leftOverCount, bool throwOnInvalid, bool flush)
+#endif
+ {
+ // Validate the parameters.
+ 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"));
+ }
+
+ // Determine the number of characters that we have.
+ uint ch;
+ int length = 0;
+ uint leftBits = leftOverBits;
+ uint leftSoFar = (leftOverCount & (uint)0x0F);
+ uint leftSize = ((leftOverCount >> 4) & (uint)0x0F);
+ while (count > 0) {
+ ch = (uint)(bytes[index++]);
+ --count;
+ if (leftSize == 0) {
+ // Process a UTF-8 start character.
+ if (ch < (uint)0x0080) {
+ // Single-byte UTF-8 character.
+ ++length;
+ } else if ((ch & (uint)0xE0) == (uint)0xC0) {
+ // Double-byte UTF-8 character.
+ leftBits = (ch & (uint)0x1F);
+ leftSoFar = 1;
+ leftSize = 2;
+ } else if ((ch & (uint)0xF0) == (uint)0xE0) {
+ // Three-byte UTF-8 character.
+ leftBits = (ch & (uint)0x0F);
+ leftSoFar = 1;
+ leftSize = 3;
+ } else if ((ch & (uint)0xF8) == (uint)0xF0) {
+ // Four-byte UTF-8 character.
+ leftBits = (ch & (uint)0x07);
+ leftSoFar = 1;
+ leftSize = 4;
+ } else if ((ch & (uint)0xFC) == (uint)0xF8) {
+ // Five-byte UTF-8 character.
+ leftBits = (ch & (uint)0x03);
+ leftSoFar = 1;
+ leftSize = 5;
+ } else if ((ch & (uint)0xFE) == (uint)0xFC) {
+ // Six-byte UTF-8 character.
+ leftBits = (ch & (uint)0x03);
+ leftSoFar = 1;
+ leftSize = 6;
+ } else {
+ // Invalid UTF-8 start character.
+#if NET_2_0
+ length += Fallback (fallbackBuffer, bytes, index - 1);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+ } else {
+ // Process an extra byte in a multi-byte sequence.
+ if ((ch & (uint)0xC0) == (uint)0x80) {
+ leftBits = ((leftBits << 6) | (ch & (uint)0x3F));
+ if (++leftSoFar >= leftSize) {
+ // We have a complete character now.
+ if (leftBits < (uint)0x10000) {
+ // is it an overlong ?
+ bool overlong = false;
+ switch (leftSize) {
+ case 2:
+ overlong = (leftBits <= 0x7F);
+ break;
+ case 3:
+ overlong = (leftBits <= 0x07FF);
+ break;
+ case 4:
+ overlong = (leftBits <= 0xFFFF);
+ break;
+ case 5:
+ overlong = (leftBits <= 0x1FFFFF);
+ break;
+ case 6:
+ overlong = (leftBits <= 0x03FFFFFF);
+ break;
+ }
+ if (overlong) {
+#if NET_2_0
+ length += Fallback (fallbackBuffer, bytes, index - 1);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Overlong"), leftBits.ToString ());
+#endif
+ }
+ else
+ ++length;
+ } else if (leftBits < (uint)0x110000) {
+ length += 2;
+ } else {
+#if NET_2_0
+ length += Fallback (fallbackBuffer, bytes, index - 1);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+ leftSize = 0;
+ }
+ } else {
+ // Invalid UTF-8 sequence: clear and restart.
+#if NET_2_0
+ length += Fallback (fallbackBuffer, bytes, index - 1);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ leftSize = 0;
+ --index;
+ ++count;
+ }
+ }
+ }
+ if (flush && leftSize != 0) {
+ // We had left-over bytes that didn't make up
+ // a complete UTF-8 character sequence.
+#if NET_2_0
+ length += Fallback (fallbackBuffer, bytes, index - 1);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+
+ // Return the final length to the caller.
+ return length;
+ }
+
+#if NET_2_0
+ // for GetCharCount()
+ static int Fallback (DecoderFallbackBuffer buffer, byte [] bytes, int index)
+ {
+ buffer.Fallback (bytes, index - 1);
+ return buffer.Remaining;
+ }
+
+ // for GetChars()
+ static void Fallback (DecoderFallbackBuffer buffer, byte [] bytes, int byteIndex,
+ char [] chars, ref int charIndex)
+ {
+ buffer.Fallback (bytes, byteIndex - 1);
+ while (buffer.Remaining > 0)
+ chars [charIndex++] = buffer.GetNextChar ();
+ }
+#endif
+
+ // Get the number of characters needed to decode a byte buffer.
+ public override int GetCharCount (byte[] bytes, int index, int count)
+ {
+#if NET_2_0
+ return InternalGetCharCount (bytes, index, count, 0, 0, DecoderFallback.CreateFallbackBuffer (), true);
+#else
+ return InternalGetCharCount (bytes, index, count, 0, 0, throwOnInvalid, true);
+#endif
+ }
+
+ // Get the characters that result from decoding a byte buffer.
+#if NET_2_0
+ private static int InternalGetChars (
+ byte[] bytes, int byteIndex, int byteCount, char[] chars,
+ int charIndex, ref uint leftOverBits, ref uint leftOverCount,
+ DecoderFallbackBuffer fallbackBuffer, bool flush)
+#else
+ private static int InternalGetChars (
+ byte[] bytes, int byteIndex, int byteCount, char[] chars,
+ int charIndex, ref uint leftOverBits, ref uint leftOverCount,
+ bool throwOnInvalid, bool flush)
+#endif
+ {
+ // Validate the parameters.
+ 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 (charIndex == chars.Length)
+ return 0;
+
+ // Convert the bytes into the output buffer.
+ uint ch;
+ int length = chars.Length;
+ int posn = charIndex;
+ uint leftBits = leftOverBits;
+ uint leftSoFar = (leftOverCount & (uint)0x0F);
+ uint leftSize = ((leftOverCount >> 4) & (uint)0x0F);
+ while (byteCount > 0) {
+ // Fetch the next character from the byte buffer.
+ ch = (uint)(bytes[byteIndex++]);
+ --byteCount;
+ if (leftSize == 0) {
+ // Process a UTF-8 start character.
+ if (ch < (uint)0x0080) {
+ // Single-byte UTF-8 character.
+ if (posn >= length) {
+ throw new ArgumentException (_("Arg_InsufficientSpace"), "chars");
+ }
+ chars[posn++] = (char)ch;
+ } else if ((ch & (uint)0xE0) == (uint)0xC0) {
+ // Double-byte UTF-8 character.
+ leftBits = (ch & (uint)0x1F);
+ leftSoFar = 1;
+ leftSize = 2;
+ } else if ((ch & (uint)0xF0) == (uint)0xE0) {
+ // Three-byte UTF-8 character.
+ leftBits = (ch & (uint)0x0F);
+ leftSoFar = 1;
+ leftSize = 3;
+ } else if ((ch & (uint)0xF8) == (uint)0xF0) {
+ // Four-byte UTF-8 character.
+ leftBits = (ch & (uint)0x07);
+ leftSoFar = 1;
+ leftSize = 4;
+ } else if ((ch & (uint)0xFC) == (uint)0xF8) {
+ // Five-byte UTF-8 character.
+ leftBits = (ch & (uint)0x03);
+ leftSoFar = 1;
+ leftSize = 5;
+ } else if ((ch & (uint)0xFE) == (uint)0xFC) {
+ // Six-byte UTF-8 character.
+ leftBits = (ch & (uint)0x03);
+ leftSoFar = 1;
+ leftSize = 6;
+ } else {
+ // Invalid UTF-8 start character.
+#if NET_2_0
+ Fallback (fallbackBuffer, bytes, byteIndex, chars, ref posn);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+ } else {
+ // Process an extra byte in a multi-byte sequence.
+ if ((ch & (uint)0xC0) == (uint)0x80) {
+ leftBits = ((leftBits << 6) | (ch & (uint)0x3F));
+ if (++leftSoFar >= leftSize) {
+ // We have a complete character now.
+ if (leftBits < (uint)0x10000) {
+ // is it an overlong ?
+ bool overlong = false;
+ switch (leftSize) {
+ case 2:
+ overlong = (leftBits <= 0x7F);
+ break;
+ case 3:
+ overlong = (leftBits <= 0x07FF);
+ break;
+ case 4:
+ overlong = (leftBits <= 0xFFFF);
+ break;
+ case 5:
+ overlong = (leftBits <= 0x1FFFFF);
+ break;
+ case 6:
+ overlong = (leftBits <= 0x03FFFFFF);
+ break;
+ }
+ if (overlong) {
+#if NET_2_0
+ Fallback (fallbackBuffer, bytes, byteIndex, chars, ref posn);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Overlong"), leftBits.ToString ());
+#endif
+ }
+ else {
+ if (posn >= length) {
+ throw new ArgumentException
+ (_("Arg_InsufficientSpace"), "chars");
+ }
+ chars[posn++] = (char)leftBits;
+ }
+ } else if (leftBits < (uint)0x110000) {
+ if ((posn + 2) > length) {
+ throw new ArgumentException
+ (_("Arg_InsufficientSpace"), "chars");
+ }
+ leftBits -= (uint)0x10000;
+ chars[posn++] = (char)((leftBits >> 10) +
+ (uint)0xD800);
+ chars[posn++] =
+ (char)((leftBits & (uint)0x3FF) + (uint)0xDC00);
+ } else {
+#if NET_2_0
+ Fallback (fallbackBuffer, bytes, byteIndex, chars, ref posn);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+ leftSize = 0;
+ }
+ } else {
+ // Invalid UTF-8 sequence: clear and restart.
+#if NET_2_0
+ Fallback (fallbackBuffer, bytes, byteIndex, chars, ref posn);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ leftSize = 0;
+ --byteIndex;
+ ++byteCount;
+ }
+ }
+ }
+ if (flush && leftSize != 0) {
+ // We had left-over bytes that didn't make up
+ // a complete UTF-8 character sequence.
+#if NET_2_0
+ Fallback (fallbackBuffer, bytes, byteIndex, chars, ref posn);
+#else
+ if (throwOnInvalid)
+ throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#endif
+ }
+ leftOverBits = leftBits;
+ leftOverCount = (leftSoFar | (leftSize << 4));
+
+ // Return the final length to the caller.
+ return posn - charIndex;
+ }
+
+ // Get the characters that result from decoding a byte buffer.
+ public override int GetChars (byte[] bytes, int byteIndex, int byteCount,
+ char[] chars, int charIndex)
+ {
+ uint leftOverBits = 0;
+ uint leftOverCount = 0;
+#if NET_2_0
+ return InternalGetChars (bytes, byteIndex, byteCount, chars,
+ charIndex, ref leftOverBits, ref leftOverCount, DecoderFallback.CreateFallbackBuffer (), true);
+#else
+ return InternalGetChars (bytes, byteIndex, byteCount, chars,
+ charIndex, ref leftOverBits, ref leftOverCount, throwOnInvalid, true);
+#endif
+ }
+
+ // 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 * 4;
+ }
+
+ // 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;
+ }
+
+ // Get a UTF8-specific decoder that is attached to this instance.
+ public override Decoder GetDecoder ()
+ {
+#if NET_2_0
+ return new UTF8Decoder (DecoderFallback);
+#else
+ return new UTF8Decoder (throwOnInvalid);
+#endif
+ }
+
+ // Get a UTF8-specific encoder that is attached to this instance.
+ public override Encoder GetEncoder ()
+ {
+ return new UTF8Encoder (emitIdentifier);
+ }
+
+ // Get the UTF8 preamble.
+ public override byte[] GetPreamble ()
+ {
+ if (emitIdentifier) {
+ byte[] pre = new byte [3];
+ pre[0] = (byte)0xEF;
+ pre[1] = (byte)0xBB;
+ pre[2] = (byte)0xBF;
+ return pre;
+ } else {
+ return new byte [0];
+ }
+ }
+
+ // Determine if this object is equal to another.
+ public override bool Equals (Object value)
+ {
+ UTF8Encoding enc = (value as UTF8Encoding);
+ if (enc != null) {
+#if NET_2_0
+ return (codePage == enc.codePage &&
+ emitIdentifier == enc.emitIdentifier &&
+ DecoderFallback == enc.DecoderFallback &&
+ EncoderFallback == enc.EncoderFallback);
+#else
+ return (codePage == enc.codePage &&
+ emitIdentifier == enc.emitIdentifier &&
+ throwOnInvalid == enc.throwOnInvalid);
+#endif
+ } else {
+ return false;
+ }
+ }
+
+ // Get the hash code for this object.
+ public override int GetHashCode ()
+ {
+ return base.GetHashCode ();
+ }
+
+ public override byte [] GetBytes (String s)
+ {
+ if (s == null)
+ throw new ArgumentNullException ("s");
+
+ int length = GetByteCount (s);
+ byte [] bytes = new byte [length];
+ GetBytes (s, 0, s.Length, bytes, 0);
+ return bytes;
+ }
+
+ // UTF-8 decoder implementation.
+ [Serializable]
+ private class UTF8Decoder : Decoder
+ {
+#if !NET_2_0
+ private bool throwOnInvalid;
+#endif
+ private uint leftOverBits;
+ private uint leftOverCount;
+
+ // Constructor.
+#if NET_2_0
+ public UTF8Decoder (DecoderFallback fallback)
+#else
+ public UTF8Decoder (bool throwOnInvalid)
+#endif
+ {
+#if NET_2_0
+ Fallback = fallback;
+#else
+ this.throwOnInvalid = throwOnInvalid;
+#endif
+ leftOverBits = 0;
+ leftOverCount = 0;
+ }
+
+ // Override inherited methods.
+ public override int GetCharCount (byte[] bytes, int index, int count)
+ {
+#if NET_2_0
+ return InternalGetCharCount (bytes, index, count,
+ leftOverBits, leftOverCount, FallbackBuffer, false);
+#else
+ return InternalGetCharCount (bytes, index, count,
+ leftOverBits, leftOverCount, throwOnInvalid, false);
+#endif
+ }
+ public override int GetChars (byte[] bytes, int byteIndex,
+ int byteCount, char[] chars, int charIndex)
+ {
+#if NET_2_0
+ return InternalGetChars (bytes, byteIndex, byteCount,
+ chars, charIndex, ref leftOverBits, ref leftOverCount, FallbackBuffer, false);
+#else
+ return InternalGetChars (bytes, byteIndex, byteCount,
+ chars, charIndex, ref leftOverBits, ref leftOverCount, throwOnInvalid, false);
+#endif
+ }
+
+ } // class UTF8Decoder
+
+ // UTF-8 encoder implementation.
+ [Serializable]
+ private class UTF8Encoder : Encoder
+ {
+ private bool emitIdentifier;
+ private uint leftOver;
+
+ // Constructor.
+ public UTF8Encoder (bool emitIdentifier)
+ {
+ this.emitIdentifier = emitIdentifier;
+ leftOver = 0;
+ }
+
+ // Override inherited methods.
+ public override int GetByteCount (char[] chars, int index,
+ int count, bool flush)
+ {
+ return InternalGetByteCount (chars, index, count, leftOver, flush);
+ }
+ public override int GetBytes (char[] chars, int charIndex,
+ int charCount, byte[] bytes, int byteCount, bool flush)
+ {
+ int result;
+ result = InternalGetBytes (chars, charIndex, charCount, bytes, byteCount, ref leftOver, flush);
+ emitIdentifier = false;
+ return result;
+ }
+
+ } // class UTF8Encoder
+
+}; // class UTF8Encoding
+
+}; // namespace System.Text
projects / mono.git / blobdiff