| public abstract GetMaxByteCount ( int charCount ) : int | ||
| charCount | int | |
| 리턴 | int | |
public void TestBaseEncodings()
{
Assert.True(Enc.ASCII.IsSingleByte);
Assert.True(latin1.IsSingleByte);
Assert.False(Enc.BigEndianUnicode.IsSingleByte);
Assert.False(Enc.Unicode.IsSingleByte);
Assert.False(Enc.UTF7.IsSingleByte);
Assert.False(Enc.UTF8.IsSingleByte);
Assert.False(Enc.UTF32.IsSingleByte);
// Why???
if (Platform.GetOS() == Platform.OS.Windows)
{
Assert.AreEqual(2, Enc.ASCII.GetMaxByteCount(1));
Assert.AreEqual(2, latin1.GetMaxByteCount(1));
Assert.AreEqual(4, Enc.BigEndianUnicode.GetMaxByteCount(1));
Assert.AreEqual(4, Enc.Unicode.GetMaxByteCount(1));
Assert.AreEqual(5, Enc.UTF7.GetMaxByteCount(1));
Assert.AreEqual(6, Enc.UTF8.GetMaxByteCount(1));
Assert.AreEqual(8, Enc.UTF32.GetMaxByteCount(1));
}
else
{
Assert.AreEqual(1, Enc.ASCII.GetMaxByteCount(1));
Assert.AreEqual(1, latin1.GetMaxByteCount(1));
Assert.AreEqual(2, Enc.BigEndianUnicode.GetMaxByteCount(1));
Assert.AreEqual(2, Enc.Unicode.GetMaxByteCount(1));
Assert.AreEqual(5, Enc.UTF7.GetMaxByteCount(1));
Assert.AreEqual(4, Enc.UTF8.GetMaxByteCount(1));
Assert.AreEqual(4, Enc.UTF32.GetMaxByteCount(1));
}
}
public BinaryReader(Stream input, Encoding encoding)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (encoding == null)
{
throw new ArgumentNullException("encoding");
}
if (!input.CanRead)
{
throw new ArgumentException(Environment.GetResourceString("Argument_StreamNotReadable"));
}
this.m_stream = input;
this.m_decoder = encoding.GetDecoder();
this.m_maxCharsSize = encoding.GetMaxCharCount(0x80);
int maxByteCount = encoding.GetMaxByteCount(1);
if (maxByteCount < 0x10)
{
maxByteCount = 0x10;
}
this.m_buffer = new byte[maxByteCount];
this.m_charBuffer = null;
this.m_charBytes = null;
this.m_2BytesPerChar = encoding is UnicodeEncoding;
this.m_isMemoryStream = this.m_stream.GetType() == typeof(MemoryStream);
}
public static string UrlEncode(string s, Encoding Enc)
{
if (s == null)
{
return null;
}
if (s == "")
{
return "";
}
bool flag = false;
int length = s.Length;
for (int i = 0; i < length; i++)
{
char c = s[i];
if (((((c < '0') || ((c < 'A') && (c > '9'))) || ((c > 'Z') && (c < 'a'))) || (c > 'z')) && !NotEncoded(c))
{
flag = true;
break;
}
}
if (!flag)
{
return s;
}
byte[] bytes = new byte[Enc.GetMaxByteCount(s.Length)];
int count = Enc.GetBytes(s, 0, s.Length, bytes, 0);
return Encoding.ASCII.GetString(UrlEncodeToBytes(bytes, 0, count));
}
public EndianReader(Stream input, Endianness endianess, Encoding encoding, bool leaveOpen)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (encoding == null)
{
throw new ArgumentNullException(nameof(encoding));
}
if (!input.CanRead)
throw new ArgumentException("Can't read from the output stream", nameof(input));
Contract.EndContractBlock();
BaseStream = input;
decoder = encoding.GetDecoder();
maxCharsSize = encoding.GetMaxCharCount(MaxCharBytesSize);
var minBufferSize = encoding.GetMaxByteCount(1); // max bytes per one char
if (minBufferSize < 16)
minBufferSize = 16;
buffer = new byte[minBufferSize];
// m_charBuffer and m_charBytes will be left null.
// For Encodings that always use 2 bytes per char (or more),
// special case them here to make Read() & Peek() faster.
use2BytesPerChar = encoding is UnicodeEncoding;
this.leaveOpen = leaveOpen;
Endianness = endianess;
resolvedEndianess = EndianessHelper.Resolve(endianess);
Contract.Assert(decoder != null, "[EndianReader.ctor]m_decoder!=null");
}
public static string UrlEncode(string s, Encoding Enc)
{
if (s == null)
return null;
if (s == String.Empty)
return String.Empty;
bool needEncode = false;
int len = s.Length;
for (int i = 0; i < len; i++)
{
char c = s[i];
if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z'))
{
if (HttpEncoder.NotEncoded(c))
continue;
needEncode = true;
break;
}
}
if (!needEncode)
return s;
// avoided GetByteCount call
byte[] bytes = new byte[Enc.GetMaxByteCount(s.Length)];
int realLen = Enc.GetBytes(s, 0, s.Length, bytes, 0);
byte[] t2 = UrlEncodeToBytes(bytes, 0, realLen);
return Encoding.UTF8.GetString(t2, 0, t2.Length);
}
public BinaryReader(Stream input, Encoding encoding, bool leaveOpen) {
if (input==null) {
throw new ArgumentNullException(nameof(input));
}
if (encoding==null) {
throw new ArgumentNullException(nameof(encoding));
}
if (!input.CanRead)
throw new ArgumentException(Environment.GetResourceString("Argument_StreamNotReadable"));
Contract.EndContractBlock();
m_stream = input;
m_decoder = encoding.GetDecoder();
m_maxCharsSize = encoding.GetMaxCharCount(MaxCharBytesSize);
int minBufferSize = encoding.GetMaxByteCount(1); // max bytes per one char
if (minBufferSize < 16)
minBufferSize = 16;
m_buffer = new byte[minBufferSize];
// m_charBuffer and m_charBytes will be left null.
// For Encodings that always use 2 bytes per char (or more),
// special case them here to make Read() & Peek() faster.
m_2BytesPerChar = encoding is UnicodeEncoding;
// check if BinaryReader is based on MemoryStream, and keep this for it's life
// we cannot use "as" operator, since derived classes are not allowed
m_isMemoryStream = (m_stream.GetType() == typeof(MemoryStream));
m_leaveOpen = leaveOpen;
Contract.Assert(m_decoder!=null, "[BinaryReader.ctor]m_decoder!=null");
}
private void Init(Stream stream, System.Text.Encoding encoding, int bufferSize)
{
this.stream = stream;
this.encoding = encoding;
this.encoder = encoding.GetEncoder();
if (bufferSize < 0x80)
{
bufferSize = 0x80;
}
this.charBuffer = new char[bufferSize];
this.byteBuffer = new byte[encoding.GetMaxByteCount(bufferSize)];
this.charLen = bufferSize;
if (stream.CanSeek && (stream.Position > 0L))
{
this.haveWrittenPreamble = true;
}
this.closable = true;
if (Mda.StreamWriterBufferedDataLost.Enabled)
{
string cs = null;
if (Mda.StreamWriterBufferedDataLost.CaptureAllocatedCallStack)
{
cs = Environment.GetStackTrace(null, false);
}
this.mdaHelper = new MdaHelper(this, cs);
}
}
public HttpResponseStreamWriter(Stream stream, Encoding encoding, int bufferSize)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (!stream.CanWrite)
{
throw new ArgumentException(Resources.HttpResponseStreamWriter_StreamNotWritable, nameof(stream));
}
if (encoding == null)
{
throw new ArgumentNullException(nameof(encoding));
}
_stream = stream;
Encoding = encoding;
_charBufferSize = bufferSize;
if (bufferSize < MinBufferSize)
{
bufferSize = MinBufferSize;
}
_encoder = encoding.GetEncoder();
_byteBuffer = new byte[encoding.GetMaxByteCount(bufferSize)];
_charBuffer = new char[bufferSize];
}
private RubyEncoding(Encoding/*!*/ encoding, Encoding/*!*/ strictEncoding, int ordinal) {
Assert.NotNull(encoding, strictEncoding);
_ordinal = ordinal;
_encoding = encoding;
_strictEncoding = strictEncoding;
_maxBytesPerChar = strictEncoding.GetMaxByteCount(1);
_isAsciiIdentity = AsciiIdentity(encoding);
}
protected InternalReaderBase(Encoding encoding, int bufferSize)
{
encoding_ = encoding;
isSingleByte_ = encoding_.GetMaxByteCount(1) == 1;
buffer_ = new byte[bufferSize];
handle_ = GCHandle.Alloc(buffer_, GCHandleType.Pinned);
basePointer_ = handle_.AddrOfPinnedObject();
}
public TextReaderStream(TextReader textReader, Encoding encoding, int bufferSize = 4096)
{
_textReader = textReader;
_encoding = encoding;
_maxByteCountPerChar = _encoding.GetMaxByteCount(1);
_encoder = encoding.GetEncoder();
if (bufferSize <= 0) throw new ArgumentOutOfRangeException("bufferSize", "zero or negative");
_charBuffer = new char[bufferSize];
}
public HttpResponseStreamWriter(Stream stream, Encoding encoding, int bufferSize)
{
_stream = stream;
Encoding = encoding;
_encoder = encoding.GetEncoder();
_charBufferSize = bufferSize;
_charBuffer = new ArraySegment<char>(new char[bufferSize]);
_byteBuffer = new ArraySegment<byte>(new byte[encoding.GetMaxByteCount(bufferSize)]);
}
private void TestEncoding(Encoding enc, int byteCount, int maxByteCount, byte[] bytes)
{
Assert.Equal(byteCount, enc.GetByteCount(s_myChars));
Assert.Equal(maxByteCount, enc.GetMaxByteCount(s_myChars.Length));
Assert.Equal(enc.GetBytes(s_myChars), bytes);
Assert.Equal(enc.GetCharCount(bytes), s_myChars.Length);
Assert.Equal(enc.GetChars(bytes), s_myChars);
Assert.Equal(enc.GetString(bytes, 0, bytes.Length), s_myString);
Assert.NotEqual(0, enc.GetHashCode());
}
/// <summary>
/// Creates a new stream reader with a custom encoding.
/// </summary>
/// <param name="input">underlying input stream</param>
/// <param name="encoding">custom encoding</param>
public BinaryNBOReader(Stream input, Encoding encoding)
: base(input, encoding)
{
int maxByteCount = encoding.GetMaxByteCount(1);
if (maxByteCount < 0x10)
{
maxByteCount = 0x10;
}
buffer = new byte[maxByteCount];
}
/// <summary>
/// Modifies a single column value in a modified record to be inserted or to
/// update the current record.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The cursor to update. An update should be prepared.</param>
/// <param name="columnid">The columnid to set.</param>
/// <param name="data">The data to set.</param>
/// <param name="encoding">The encoding used to convert the string.</param>
/// <param name="grbit">SetColumn options.</param>
public static void SetColumn(
JET_SESID sesid, JET_TABLEID tableid, JET_COLUMNID columnid, string data, Encoding encoding, SetColumnGrbit grbit)
{
CheckEncodingIsValid(encoding);
if (null == data)
{
JetSetColumn(sesid, tableid, columnid, null, 0, grbit, null);
}
else if (0 == data.Length)
{
JetSetColumn(sesid, tableid, columnid, null, 0, grbit | SetColumnGrbit.ZeroLength, null);
}
else if (Encoding.Unicode == encoding)
{
// Optimization for setting Unicode strings.
unsafe
{
fixed (char* buffer = data)
{
JetSetColumn(
sesid,
tableid,
columnid,
new IntPtr(buffer),
checked(data.Length * sizeof(char)),
grbit,
null);
}
}
}
else if (encoding.GetMaxByteCount(data.Length) <= Caches.ColumnCache.BufferSize)
{
// The encoding output will fix in a cached buffer. Get one to avoid
// more memory allocations.
byte[] buffer = Caches.ColumnCache.Allocate();
unsafe
{
fixed (char* chars = data)
fixed (byte* bytes = buffer)
{
int dataSize = encoding.GetBytes(chars, data.Length, bytes, buffer.Length);
JetSetColumn(sesid, tableid, columnid, new IntPtr(bytes), dataSize, grbit, null);
}
}
Caches.ColumnCache.Free(ref buffer);
}
else
{
byte[] bytes = encoding.GetBytes(data);
JetSetColumn(sesid, tableid, columnid, bytes, bytes.Length, grbit, null);
}
}
internal void Initialize(Encoding encoding, int bufferSize) {
internalEncoding = encoding;
decode_pos = byte_pos = 0;
int BufferSize = Math.Max(bufferSize, MinimumBufferSize);
decode_buf = new char [BufferSize];
byte_buf = new byte [encoding.GetMaxByteCount (BufferSize)];
// Fixes bug http://bugzilla.ximian.com/show_bug.cgi?id=74513
if (internalStream.CanSeek && internalStream.Position > 0)
preamble_done = true;
}
public MyBinaryReader(Stream stream, Encoding encoding)
: base(stream, encoding)
{
this.m_decoder = encoding.GetDecoder();
this.m_maxCharsSize = encoding.GetMaxCharCount(0x80);
int maxByteCount = encoding.GetMaxByteCount(1);
if (maxByteCount < 0x10)
{
maxByteCount = 0x10;
}
}
public unsafe BufferedBinaryWriter(Stream output, Encoding encoding)
: base(output, encoding)
{
this.memoryPage = Pool.GetPage();
this.basePtr = this.memoryPage.BasePtr;
this.endPtr = this.memoryPage.EndPtr;
this.ptr = this.basePtr;
this.encoding = encoding;
this.encoder = encoding.GetEncoder();
this.charMaxByteCount = encoding.IsSingleByte ? 1 : encoding.GetMaxByteCount(1);
}
public BinaryReader(Stream input, Encoding encoding) {
if (input == null || encoding == null)
throw new ArgumentNullException(Locale.GetText ("Input or Encoding is a null reference."));
if (!input.CanRead)
throw new ArgumentException(Locale.GetText ("The stream doesn't support reading."));
m_stream = input;
m_encoding = encoding;
decoder = encoding.GetDecoder ();
// internal buffer size is documented to be between 16 and the value
// returned by GetMaxByteCount for the specified encoding
m_buffer = new byte [Math.Max (16, encoding.GetMaxByteCount (1))];
}
public HttpResponseStreamWriter(
Stream stream,
Encoding encoding,
int bufferSize,
LeasedArraySegment<byte> leasedByteBuffer,
LeasedArraySegment<char> leasedCharBuffer)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (encoding == null)
{
throw new ArgumentNullException(nameof(encoding));
}
if (leasedByteBuffer == null)
{
throw new ArgumentNullException(nameof(leasedByteBuffer));
}
if (leasedCharBuffer == null)
{
throw new ArgumentNullException(nameof(leasedCharBuffer));
}
var requiredLength = encoding.GetMaxByteCount(bufferSize);
if (requiredLength > leasedByteBuffer.Data.Count)
{
var message = Resources.FormatHttpResponseStreamWriter_InvalidBufferSize(
requiredLength,
bufferSize,
encoding.EncodingName,
typeof(Encoding).FullName,
nameof(Encoding.GetMaxByteCount));
throw new ArgumentException(message, nameof(leasedByteBuffer));
}
_stream = stream;
Encoding = encoding;
_charBufferSize = bufferSize;
_leasedByteBuffer = leasedByteBuffer;
_leasedCharBuffer = leasedCharBuffer;
_encoder = encoding.GetEncoder();
_byteBuffer = leasedByteBuffer.Data;
_charBuffer = leasedCharBuffer.Data;
}
static public int GetMaxByteCount(IntPtr l)
{
try {
System.Text.Encoding self = (System.Text.Encoding)checkSelf(l);
System.Int32 a1;
checkType(l, 2, out a1);
var ret = self.GetMaxByteCount(a1);
pushValue(l, true);
pushValue(l, ret);
return(2);
}
catch (Exception e) {
return(error(l, e));
}
}
public TcpBinaryReader(Stream input, Encoding encoding)
: base(input, encoding)
{
m_stream = input;
this.m_decoder = encoding.GetDecoder();
this.m_maxCharsSize = encoding.GetMaxCharCount(0x80);
int maxByteCount = encoding.GetMaxByteCount(1);
if (maxByteCount < 0x10)
{
maxByteCount = 0x10;
}
this.m_buffer = new byte[maxByteCount];
this.m_2BytesPerChar = encoding is UnicodeEncoding;
this.m_isMemoryStream = this.m_stream.GetType() == typeof(MemoryStream);
}
public HttpResponseStreamWriter(Stream stream, Encoding encoding, int bufferSize)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (encoding == null)
{
throw new ArgumentNullException(nameof(encoding));
}
_stream = stream;
Encoding = encoding;
_charBufferSize = bufferSize;
_encoder = encoding.GetEncoder();
_byteBuffer = new ArraySegment<byte>(new byte[encoding.GetMaxByteCount(bufferSize)]);
_charBuffer = new ArraySegment<char>(new char[bufferSize]);
}
/// <inheritdoc />
public TextWriter CreateWriter(Stream stream, Encoding encoding)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (encoding == null)
{
throw new ArgumentNullException(nameof(encoding));
}
LeasedArraySegment<byte> bytes = null;
LeasedArraySegment<char> chars = null;
try
{
chars = _charPool.Lease(DefaultBufferSize);
// We need to compute the minimum size of the byte buffer based on the size of the char buffer,
// so that we have enough room to encode the buffer in one shot.
var minimumSize = encoding.GetMaxByteCount(DefaultBufferSize);
bytes = _bytePool.Lease(minimumSize);
return new HttpResponseStreamWriter(stream, encoding, DefaultBufferSize, bytes, chars);
}
catch
{
if (bytes != null)
{
bytes.Owner.Return(bytes);
}
if (chars != null)
{
chars.Owner.Return(chars);
}
throw;
}
}
public BinaryReader(Stream input, Encoding encoding, bool leaveOpen)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (encoding == null)
{
throw new ArgumentNullException("encoding");
}
if (!input.CanRead)
{
throw new ArgumentException(SR.Argument_StreamNotReadable);
}
_stream = input;
_decoder = encoding.GetDecoder();
_maxCharsSize = encoding.GetMaxCharCount(MaxCharBytesSize);
int minBufferSize = encoding.GetMaxByteCount(1); // max bytes per one char
if (minBufferSize < 16)
{
minBufferSize = 16;
}
_buffer = new byte[minBufferSize];
// _charBuffer and _charBytes will be left null.
// For Encodings that always use 2 bytes per char (or more),
// special case them here to make Read() & Peek() faster.
_2BytesPerChar = encoding is UnicodeEncoding;
// check if BinaryReader is based on MemoryStream, and keep this for it's life
// we cannot use "as" operator, since derived classes are not allowed
_isMemoryStream = (_stream.GetType() == typeof(MemoryStream));
_leaveOpen = leaveOpen;
Debug.Assert(_decoder != null, "[BinaryReader.ctor]_decoder!=null");
}
/// <include file='doc\BinaryReader.uex' path='docs/doc[@for="BinaryReader.BinaryReader1"]/*' />
public BinaryReader(Stream input, Encoding encoding) {
if (input==null) {
throw new ArgumentNullException("input");
}
if (encoding==null) {
throw new ArgumentNullException("encoding");
}
if (!input.CanRead)
throw new ArgumentException(Environment.GetResourceString("Argument_StreamNotReadable"));
m_stream = input;
m_decoder = encoding.GetDecoder();
int minBufferSize = encoding.GetMaxByteCount(1); // max bytes per one char
if (minBufferSize < 16)
minBufferSize = 16;
m_buffer = new byte[minBufferSize];
m_charBuffer = null;
m_charBytes = null;
// Performance hack - for Encodings that always use 2 bytes per char
// (or more), special case them here to make Read() & Peek() faster.
m_2BytesPerChar = encoding is UnicodeEncoding;
BCLDebug.Assert(m_decoder!=null, "[BinaryReader.ctor]m_decoder!=null");
}
private void Init(Stream streamArg, Encoding encodingArg, int bufferSize, bool shouldLeaveOpen)
{
_stream = streamArg;
_encoding = encodingArg;
_encoder = _encoding.GetEncoder();
if (bufferSize < MinBufferSize)
{
bufferSize = MinBufferSize;
}
_charBuffer = new char[bufferSize];
_byteBuffer = new byte[_encoding.GetMaxByteCount(bufferSize)];
_charLen = bufferSize;
// If we're appending to a Stream that already has data, don't write
// the preamble.
if (_stream.CanSeek && _stream.Position > 0)
{
_haveWrittenPreamble = true;
}
_closable = !shouldLeaveOpen;
}
private Task WriteEncodingChar(string s, int numChars, int offset, Encoding encoding, TdsParserStateObject stateObj, bool canAccumulate = true)
{
char[] charData;
byte[] byteData;
// if hitting 7.0 server, encoding will be null in metadata for columns or return values since
// 7.0 has no support for multiple code pages in data - single code page support only
if (encoding == null)
encoding = _defaultEncoding;
charData = s.ToCharArray(offset, numChars);
// Optimization: if the entire string fits in the current buffer, then copy it directly
int bytesLeft = stateObj._outBuff.Length - stateObj._outBytesUsed;
if ((numChars <= bytesLeft) && (encoding.GetMaxByteCount(charData.Length) <= bytesLeft))
{
int bytesWritten = encoding.GetBytes(charData, 0, charData.Length, stateObj._outBuff, stateObj._outBytesUsed);
stateObj._outBytesUsed += bytesWritten;
return null;
}
else
{
byteData = encoding.GetBytes(charData, 0, numChars);
Debug.Assert(byteData != null, "no data from encoding");
return stateObj.WriteByteArray(byteData, byteData.Length, 0, canAccumulate);
}
}
internal static int getBytesPerChar( Encoding encoding )
{
return encoding.GetMaxByteCount( 1 );
}
public static string UrlEncode(string s, Encoding encoding)
{
int len;
if (s == null || (len = s.Length) == 0)
return s;
var needEncode = false;
foreach (var c in s) {
if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z')) {
if (notEncoded (c))
continue;
needEncode = true;
break;
}
}
if (!needEncode)
return s;
if (encoding == null)
encoding = Encoding.UTF8;
// Avoided GetByteCount call.
var bytes = new byte[encoding.GetMaxByteCount (len)];
var realLen = encoding.GetBytes (s, 0, len, bytes, 0);
return Encoding.ASCII.GetString (InternalUrlEncodeToBytes (bytes, 0, realLen));
}
public override int GetMaxByteCount(int charCount)
{
return(defaultEncoding.GetMaxByteCount(charCount));
}
private static string Encode(string str, MimeEncodingMethod encoding, Encoding charset, bool doFold, int foldingLimit, int foldingOffset, string foldingString)
{
if (str == null)
throw new ArgumentNullException("str");
if (charset == null)
throw new ArgumentNullException("charset");
if (doFold) {
if (foldingLimit < 1)
throw new ArgumentOutOfRangeException("foldingLimit", foldingLimit, "must be greater than 1");
if (foldingOffset < 0)
throw new ArgumentOutOfRangeException("foldingOffset", foldingOffset, "must be greater than zero");
if (foldingLimit <= foldingOffset)
throw new ArgumentOutOfRangeException("foldingOffset", foldingOffset, "must be less than foldingLimit");
if (foldingString == null)
throw new ArgumentNullException("foldingString");
}
ICryptoTransform transform;
char encodingChar;
switch (encoding) {
case MimeEncodingMethod.Base64:
transform = new ToBase64Transform();
encodingChar = 'b';
break;
case MimeEncodingMethod.QuotedPrintable:
transform = new ToQuotedPrintableTransform();
encodingChar = 'q';
break;
default:
throw new System.ComponentModel.InvalidEnumArgumentException("encoding", (int)encoding, typeof(MimeEncodingMethod));
}
var preambleText = string.Format("=?{0}?{1}?", charset.BodyName, encodingChar);
if (!doFold)
return preambleText + transform.TransformStringTo(str, charset) + "?=";
// folding
var ret = new StringBuilder();
var preamble = Encoding.ASCII.GetBytes(preambleText);
var firstLine = true;
var inputCharBuffer = str.ToCharArray();
var inputCharOffset = 0;
var outputBuffer = new byte[foldingLimit];
var ambleLength = preamble.Length + mimeEncodingPostamble.Length;
var outputLimit = foldingLimit - (foldingOffset + ambleLength);
if (outputLimit <= 0)
throw new ArgumentOutOfRangeException("foldingLimit", foldingLimit, "too short");
// copy preamble to buffer
Buffer.BlockCopy(preamble, 0, outputBuffer, 0, preamble.Length);
for (;;) {
var inputBlockSizeLimit = (outputLimit * transform.InputBlockSize) / transform.OutputBlockSize - 1;
var transformCharCount = 0;
var outputCount = preamble.Length;
// decide char count to transform
for (transformCharCount = inputBlockSizeLimit / charset.GetMaxByteCount(1);; transformCharCount++) {
if (inputCharBuffer.Length <= inputCharOffset + transformCharCount) {
transformCharCount = inputCharBuffer.Length - inputCharOffset;
break;
}
if (inputBlockSizeLimit <= charset.GetByteCount(inputCharBuffer, inputCharOffset, transformCharCount + 1))
break;
}
// transform chars
byte[] transformed = null;
for (;;) {
var t = transform.TransformBytes(charset.GetBytes(inputCharBuffer, inputCharOffset, transformCharCount));
if (transformed == null || t.Length <= outputLimit) {
transformed = t;
if (inputCharBuffer.Length <= inputCharOffset + transformCharCount + 1)
break;
transformCharCount++;
continue;
}
else {
transformCharCount--;
break;
}
}
if (outputBuffer.Length < ambleLength + transformed.Length)
throw new ArgumentOutOfRangeException("foldingLimit",
foldingLimit,
string.Format("too short, at least {0} is required", ambleLength + transformed.Length));
// copy transformed chars to buffer
Buffer.BlockCopy(transformed, 0, outputBuffer, outputCount, transformed.Length);
outputCount += transformed.Length;
// copy postanble to buffer
Buffer.BlockCopy(mimeEncodingPostamble, 0, outputBuffer, outputCount, mimeEncodingPostamble.Length);
outputCount += mimeEncodingPostamble.Length;
ret.Append(Encoding.ASCII.GetString(outputBuffer, 0, outputCount));
inputCharOffset += transformCharCount;
if (inputCharOffset < inputCharBuffer.Length) {
ret.Append(foldingString);
if (firstLine) {
outputLimit = foldingLimit - ambleLength;
firstLine = false;
}
}
else {
break;
}
}
return ret.ToString();
}
public static string UrlEncode (string s, Encoding Enc)
{
if (string.IsNullOrEmpty (s))
return s;
bool needEncode = false;
int len = s.Length;
for (int i = 0; i < len; i++) {
char c = s [i];
if ((c < '0') || (c < 'A' && c > '9') || (c > 'Z' && c < 'a') || (c > 'z')) {
if (NotEncoded (c))
continue;
needEncode = true;
break;
}
}
if (!needEncode)
return s;
// avoided GetByteCount call
byte [] bytes = new byte[Enc.GetMaxByteCount(s.Length)];
int realLen = Enc.GetBytes (s, 0, s.Length, bytes, 0);
return Encoding.ASCII.GetString (UrlEncodeToBytes (bytes, 0, realLen));
}
private unsafe void WritePrefixLengthString(int characterStart, int characterCount, Encoding encoding, char* ptr)
{
char* curr = &ptr[characterStart];
int totalByteCount = encoding.GetByteCount(curr, characterCount);
WriteVariant((uint)totalByteCount);
// May not be optimal
byte* bytes = stackalloc byte[256];
int maxChars = 256 / encoding.GetMaxByteCount(1);
while (characterCount > 0)
{
int readChars = Math.Min(maxChars, characterCount);
int byteCount = encoding.GetBytes(curr, readChars, bytes, 256);
WriteMemory(bytes, byteCount * 8);
curr += readChars;
characterCount -= readChars;
}
}
