DecoderNLS
using System.Runtime.Serialization;
namespace System.Text
{
internal class DecoderNLS : Decoder, ISerializable
{
protected EncodingNLS m_encoding;
protected bool m_mustFlush;
internal bool m_throwOnOverflow;
internal int m_bytesUsed;
internal DecoderFallback m_fallback;
internal DecoderFallbackBuffer m_fallbackBuffer;
internal new DecoderFallback Fallback => m_fallback;
internal bool InternalHasFallbackBuffer => m_fallbackBuffer != null;
public new DecoderFallbackBuffer FallbackBuffer {
get {
if (m_fallbackBuffer == null)
m_fallbackBuffer = ((m_fallback != null) ? m_fallback.CreateFallbackBuffer() : DecoderFallback.ReplacementFallback.CreateFallbackBuffer());
return m_fallbackBuffer;
}
}
public bool MustFlush => m_mustFlush;
internal virtual bool HasState => false;
internal DecoderNLS(EncodingNLS encoding)
{
m_encoding = encoding;
m_fallback = m_encoding.DecoderFallback;
Reset();
}
void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
{
throw new PlatformNotSupportedException();
}
public override void Reset()
{
m_fallbackBuffer?.Reset();
}
public override int GetCharCount(byte[] bytes, int index, int count)
{
return GetCharCount(bytes, index, count, false);
}
public unsafe override int GetCharCount(byte[] bytes, int index, int count, bool flush)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (index < 0 || count < 0)
throw new ArgumentOutOfRangeException((index < 0) ? "index" : "count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
if (bytes.Length - index >= count) {
fixed (byte* ptr = &CodePagesEncodingProvider.GetNonNullPinnableReference(bytes)) {
return GetCharCount(ptr + index, count, flush);
}
}
throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
}
public unsafe override int GetCharCount(byte* bytes, int count, bool flush)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (count < 0)
throw new ArgumentOutOfRangeException("count", System.SR.ArgumentOutOfRange_NeedNonNegNum);
m_mustFlush = flush;
m_throwOnOverflow = true;
return m_encoding.GetCharCount(bytes, count, this);
}
public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
{
return GetChars(bytes, byteIndex, byteCount, chars, charIndex, false);
}
public unsafe override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, bool flush)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteIndex < 0 || byteCount < 0)
throw new ArgumentOutOfRangeException((byteIndex < 0) ? "byteIndex" : "byteCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
if (bytes.Length - byteIndex < byteCount)
throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
if (charIndex >= 0 && charIndex <= chars.Length) {
int charCount = chars.Length - charIndex;
fixed (byte* ptr = &CodePagesEncodingProvider.GetNonNullPinnableReference(bytes)) {
fixed (char* ptr2 = &CodePagesEncodingProvider.GetNonNullPinnableReference(chars)) {
return GetChars(ptr + byteIndex, byteCount, ptr2 + charIndex, charCount, flush);
}
}
}
throw new ArgumentOutOfRangeException("charIndex", System.SR.ArgumentOutOfRange_IndexMustBeLessOrEqual);
}
public unsafe override int GetChars(byte* bytes, int byteCount, char* chars, int charCount, bool flush)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteCount < 0 || charCount < 0)
throw new ArgumentOutOfRangeException((byteCount < 0) ? "byteCount" : "charCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
m_mustFlush = flush;
m_throwOnOverflow = true;
return m_encoding.GetChars(bytes, byteCount, chars, charCount, this);
}
public unsafe override 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)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteIndex < 0 || byteCount < 0)
throw new ArgumentOutOfRangeException((byteIndex < 0) ? "byteIndex" : "byteCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
if (charIndex < 0 || charCount < 0)
throw new ArgumentOutOfRangeException((charIndex < 0) ? "charIndex" : "charCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
if (bytes.Length - byteIndex < byteCount)
throw new ArgumentOutOfRangeException("bytes", System.SR.ArgumentOutOfRange_IndexCountBuffer);
if (chars.Length - charIndex < charCount)
throw new ArgumentOutOfRangeException("chars", System.SR.ArgumentOutOfRange_IndexCountBuffer);
fixed (byte* ptr = &CodePagesEncodingProvider.GetNonNullPinnableReference(bytes)) {
fixed (char* ptr2 = &CodePagesEncodingProvider.GetNonNullPinnableReference(chars)) {
Convert(ptr + byteIndex, byteCount, ptr2 + charIndex, charCount, flush, out bytesUsed, out charsUsed, out completed);
}
}
}
public unsafe override void Convert(byte* bytes, int byteCount, char* chars, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
if (chars == null)
throw new ArgumentNullException("chars");
if (byteCount < 0 || charCount < 0)
throw new ArgumentOutOfRangeException((byteCount < 0) ? "byteCount" : "charCount", System.SR.ArgumentOutOfRange_NeedNonNegNum);
m_mustFlush = flush;
m_throwOnOverflow = false;
m_bytesUsed = 0;
charsUsed = m_encoding.GetChars(bytes, byteCount, chars, charCount, this);
bytesUsed = m_bytesUsed;
completed = (bytesUsed == byteCount && (!flush || !HasState) && (m_fallbackBuffer == null || m_fallbackBuffer.Remaining == 0));
}
internal void ClearMustFlush()
{
m_mustFlush = false;
}
}
}