* 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"),
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 state.
private bool emitIdentifier;
+#if !NET_2_0
private bool throwOnInvalid;
+#endif
// Constructors.
public UTF8Encoding () : this (false, false) {}
: 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)";
while (charCount > 0) {
// Fetch the next UTF-16 character pair value.
ch = s[charIndex++];
- --charCount;
if (ch >= '\uD800' && ch <= '\uDBFF' && charCount > 1) {
// This may be the start of a surrogate pair.
pair = (uint)(s[charIndex]);
} else {
pair = (uint)ch;
}
+ --charCount;
// Encode the character pair value.
if (pair < (uint)0x0080) {
// 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,
- bool throwOnInvalid, bool flush)
+#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) {
leftBits = (ch & (uint)0x03);
leftSoFar = 1;
leftSize = 5;
- } else if ((ch & (uint)0xFC) == (uint)0xFC) {
+ } 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 (throwOnInvalid) {
+#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 (++leftSoFar >= leftSize) {
// We have a complete character now.
if (leftBits < (uint)0x10000) {
- if (leftBits != (uint)0xFEFF) {
- ++length;
+ // 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 (throwOnInvalid) {
- throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+ } 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 (throwOnInvalid) {
+#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 && throwOnInvalid) {
+ if (flush && leftSize != 0) {
// We had left-over bytes that didn't make up
// a complete UTF-8 character sequence.
- throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#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.
- private static int InternalGetChars (byte[] bytes, int byteIndex,
- int byteCount, char[] chars,
- int charIndex, ref uint leftOverBits,
- ref uint leftOverCount,
- bool throwOnInvalid, bool flush)
+#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 ArgumentOutOfRangeException ("charIndex", _("ArgRange_Array"));
}
+ if (charIndex == chars.Length)
+ return 0;
+
// Convert the bytes into the output buffer.
uint ch;
int length = chars.Length;
leftBits = (ch & (uint)0x03);
leftSoFar = 1;
leftSize = 5;
- } else if ((ch & (uint)0xFC) == (uint)0xFC) {
+ } 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 (throwOnInvalid) {
+#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 (++leftSoFar >= leftSize) {
// We have a complete character now.
if (leftBits < (uint)0x10000) {
- if (leftBits != (uint)0xFEFF) {
+ // 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");
(uint)0xD800);
chars[posn++] =
(char)((leftBits & (uint)0x3FF) + (uint)0xDC00);
- } else if (throwOnInvalid) {
- throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+ } 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 (throwOnInvalid) {
+#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 && throwOnInvalid) {
+ if (flush && leftSize != 0) {
// We had left-over bytes that didn't make up
// a complete UTF-8 character sequence.
- throw new ArgumentException (_("Arg_InvalidUTF8"), "bytes");
+#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));
{
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
// 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.
{
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;
}
[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
projects / mono.git / blobdiff