Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Text / DecoderNLS.cs / 1 / DecoderNLS.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Text { using System.Runtime.Serialization; using System.Security.Permissions; using System.Text; using System; // A Decoder is used to decode a sequence of blocks of bytes into a // sequence of blocks of characters. Following instantiation of a decoder, // sequential blocks of bytes are converted into blocks of characters through // calls to the GetChars method. The decoder maintains state between the // conversions, allowing it to correctly decode byte sequences that span // adjacent blocks. // // Instances of specific implementations of the Decoder abstract base // class are typically obtained through calls to the GetDecoder method // of Encoding objects. // [Serializable()] internal class DecoderNLS : Decoder, ISerializable { // Remember our encoding protected Encoding m_encoding; [NonSerialized] protected bool m_mustFlush; [NonSerialized] internal bool m_throwOnOverflow; [NonSerialized] internal int m_bytesUsed; #region Serialization // Constructor called by serialization. called during deserialization. internal DecoderNLS(SerializationInfo info, StreamingContext context) { throw new NotSupportedException( String.Format( System.Globalization.CultureInfo.CurrentCulture, Environment.GetResourceString("NotSupported_TypeCannotDeserialized"), this.GetType())); } // ISerializable implementation. called during serialization. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { SerializeDecoder(info); info.AddValue("encoding", this.m_encoding); info.SetType(typeof(Encoding.DefaultDecoder)); } #endregion Serialization internal DecoderNLS( Encoding encoding ) { this.m_encoding = encoding; this.m_fallback = this.m_encoding.DecoderFallback; this.Reset(); } // This is used by our child deserializers internal DecoderNLS( ) { this.m_encoding = null; this.Reset(); } public override void Reset() { if (m_fallbackBuffer != null) m_fallbackBuffer.Reset(); } public override unsafe int GetCharCount(byte[] bytes, int index, int count) { return GetCharCount(bytes, index, count, false); } public override unsafe int GetCharCount(byte[] bytes, int index, int count, bool flush) { // Validate Parameters if (bytes == null) throw new ArgumentNullException("bytes", Environment.GetResourceString("ArgumentNull_Array")); if (index < 0 || count < 0) throw new ArgumentOutOfRangeException((index<0 ? "index" : "count"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (bytes.Length - index < count) throw new ArgumentOutOfRangeException("bytes", Environment.GetResourceString("ArgumentOutOfRange_IndexCountBuffer")); // Avoid null fixed problem if (bytes.Length == 0) bytes = new byte[1]; // Just call pointer version fixed (byte* pBytes = bytes) return GetCharCount(pBytes + index, count, flush); } public unsafe override int GetCharCount(byte* bytes, int count, bool flush) { // Validate parameters if (bytes == null) throw new ArgumentNullException("bytes", Environment.GetResourceString("ArgumentNull_Array")); if (count < 0) throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); // Remember the flush this.m_mustFlush = flush; this.m_throwOnOverflow = true; // By default just call the encoding version, no flush by default return m_encoding.GetCharCount(bytes, count, this); } public override unsafe int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex) { return GetChars(bytes, byteIndex, byteCount, chars, charIndex, false); } public override unsafe int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, bool flush) { // Validate Parameters if (bytes == null || chars == null) throw new ArgumentNullException(bytes == null ? "bytes" : "chars", Environment.GetResourceString("ArgumentNull_Array")); if (byteIndex < 0 || byteCount < 0) throw new ArgumentOutOfRangeException((byteIndex<0 ? "byteIndex" : "byteCount"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if ( bytes.Length - byteIndex < byteCount) throw new ArgumentOutOfRangeException("bytes", Environment.GetResourceString("ArgumentOutOfRange_IndexCountBuffer")); if (charIndex < 0 || charIndex > chars.Length) throw new ArgumentOutOfRangeException("charIndex", Environment.GetResourceString("ArgumentOutOfRange_Index")); // Avoid empty input fixed problem if (bytes.Length == 0) bytes = new byte[1]; int charCount = chars.Length - charIndex; if (chars.Length == 0) chars = new char[1]; // Just call pointer version fixed (byte* pBytes = bytes) fixed (char* pChars = chars) // Remember that charCount is # to decode, not size of array return GetChars(pBytes + byteIndex, byteCount, pChars + charIndex, charCount, flush); } public unsafe override int GetChars(byte* bytes, int byteCount, char* chars, int charCount, bool flush) { // Validate parameters if (chars == null || bytes == null) throw new ArgumentNullException((chars == null ? "chars" : "bytes"), Environment.GetResourceString("ArgumentNull_Array")); if (byteCount < 0 || charCount < 0) throw new ArgumentOutOfRangeException((byteCount<0 ? "byteCount" : "charCount"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); // Remember our flush m_mustFlush = flush; m_throwOnOverflow = true; // By default just call the encoding's version return m_encoding.GetChars(bytes, byteCount, chars, charCount, this); } // This method is used when the output buffer might not be big enough. // Just call the pointer version. (This gets chars) public override unsafe void Convert(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed) { // Validate parameters if (bytes == null || chars == null) throw new ArgumentNullException((bytes == null ? "bytes" : "chars"), Environment.GetResourceString("ArgumentNull_Array")); if (byteIndex < 0 || byteCount < 0) throw new ArgumentOutOfRangeException((byteIndex<0 ? "byteIndex" : "byteCount"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (charIndex < 0 || charCount < 0) throw new ArgumentOutOfRangeException((charIndex<0 ? "charIndex" : "charCount"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (bytes.Length - byteIndex < byteCount) throw new ArgumentOutOfRangeException("bytes", Environment.GetResourceString("ArgumentOutOfRange_IndexCountBuffer")); if (chars.Length - charIndex < charCount) throw new ArgumentOutOfRangeException("chars", Environment.GetResourceString("ArgumentOutOfRange_IndexCountBuffer")); // Avoid empty input problem if (bytes.Length == 0) bytes = new byte[1]; if (chars.Length == 0) chars = new char[1]; // Just call the pointer version (public overrides can't do this) fixed (byte* pBytes = bytes) { fixed (char* pChars = chars) { Convert(pBytes + byteIndex, byteCount, pChars + charIndex, charCount, flush, out bytesUsed, out charsUsed, out completed); } } } // This is the version that used pointers. We call the base encoding worker function // after setting our appropriate internal variables. This is getting chars public unsafe override void Convert(byte* bytes, int byteCount, char* chars, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed) { // Validate input parameters if (chars == null || bytes == null) throw new ArgumentNullException(chars == null ? "chars" : "bytes", Environment.GetResourceString("ArgumentNull_Array")); if (byteCount < 0 || charCount < 0) throw new ArgumentOutOfRangeException((byteCount<0 ? "byteCount" : "charCount"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); // We don't want to throw this.m_mustFlush = flush; this.m_throwOnOverflow = false; this.m_bytesUsed = 0; // Do conversion charsUsed = this.m_encoding.GetChars(bytes, byteCount, chars, charCount, this); bytesUsed = this.m_bytesUsed; // Its completed if they've used what they wanted AND if they didn't want flush or if we are flushed completed = (bytesUsed == byteCount) && (!flush || !this.HasState) && (m_fallbackBuffer == null || m_fallbackBuffer.Remaining == 0); // Our data thingys are now full, we can return } public bool MustFlush { get { return m_mustFlush; } } // Anything left in our decoder? internal virtual bool HasState { get { return false; } } // Allow encoding to clear our must flush instead of throwing (in ThrowCharsOverflow) internal void ClearMustFlush() { m_mustFlush = false; } } }
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