internal static int CopyStream(Stream source, Stream target, Encoding encoding, int charCount, bool needCrc, out uint crc)
{
crc = 0U;
byte[] array = null;
WBXmlStreamHelper.CharArrayBuffer charArrayBuffer = null;
int num = 0;
if (charCount == 0)
{
return(0);
}
if (charCount < 0)
{
charCount = int.MaxValue;
}
int result;
try
{
array = WBXmlStreamHelper.BytesBufferPool.Acquire();
charArrayBuffer = WBXmlStreamHelper.CharsBufferPool.Acquire();
if (array == null)
{
throw new InvalidOperationException("bytesBuffer should never be null.");
}
if (charArrayBuffer == null)
{
throw new InvalidOperationException("charsBuffer should never be null.");
}
StreamReader streamReader = new StreamReader(source, encoding);
do
{
int num2 = (6144 > charCount - num - 1) ? (charCount - num - 1) : 6144;
if (num2 == 0)
{
num2 = 1;
}
int num3 = streamReader.ReadBlock(charArrayBuffer.Buffer, 0, num2);
if (num3 == 0)
{
break;
}
if (WBXmlStreamHelper.NeedToHandleSurrogate(charArrayBuffer.Buffer, num2, num3))
{
int num4 = streamReader.Read();
if (num4 != -1)
{
charArrayBuffer.Buffer[num3] = (char)num4;
char c = charArrayBuffer.Buffer[num3];
char c2 = charArrayBuffer.Buffer[num3 - 1];
if (!char.IsSurrogatePair(c2, c))
{
string.Format(CultureInfo.InvariantCulture, "Invalid surrogate chars: first={0}, second={1}", new object[]
{
c2,
c
});
}
num3++;
}
}
num += num3;
int bytes = encoding.GetBytes(charArrayBuffer.Buffer, 0, num3, array, 0);
target.Write(array, 0, bytes);
if (needCrc)
{
crc = WBXmlStreamHelper.UpdateCrc32(crc, array, 0, bytes);
}
}while (num < charCount);
result = num;
}
finally
{
if (array != null)
{
WBXmlStreamHelper.BytesBufferPool.Release(array);
}
if (charArrayBuffer != null)
{
charArrayBuffer.Clear();
WBXmlStreamHelper.CharsBufferPool.Release(charArrayBuffer);
}
}
return(result);
}
internal static int CopyStreamWithBase64Conversion(Stream source, Stream target, int byteCount, bool encode)
{
if (byteCount == 0)
{
return(0);
}
if (byteCount < 0)
{
byteCount = int.MaxValue;
}
byte[] array = null;
WBXmlStreamHelper.CharArrayBuffer charArrayBuffer = null;
int num = 0;
int num2 = 0;
int result;
try
{
array = WBXmlStreamHelper.BytesBufferPool.Acquire();
charArrayBuffer = WBXmlStreamHelper.CharsBufferPool.Acquire();
if (array == null)
{
throw new InvalidOperationException("bytesBuffer should never be null.");
}
if (charArrayBuffer == null)
{
throw new InvalidOperationException("base64CharsBuffer should never be null.");
}
do
{
int count = (18432 > byteCount - num) ? (byteCount - num) : 18432;
int num3 = source.Read(array, 0, count);
if (num3 == 0)
{
break;
}
if (encode)
{
int charCount = Convert.ToBase64CharArray(array, 0, num3, charArrayBuffer.Buffer, 0);
int bytes = Encoding.UTF8.GetBytes(charArrayBuffer.Buffer, 0, charCount, array, 0);
target.Write(array, 0, bytes);
num2 += bytes;
}
else
{
int chars = Encoding.UTF8.GetChars(array, 0, num3, charArrayBuffer.Buffer, 0);
byte[] array2 = Convert.FromBase64CharArray(charArrayBuffer.Buffer, 0, chars);
target.Write(array2, 0, array2.Length);
num2 += array2.Length;
}
num += num3;
}while (num < byteCount);
result = num2;
}
finally
{
if (array != null)
{
WBXmlStreamHelper.BytesBufferPool.Release(array);
}
if (charArrayBuffer != null)
{
charArrayBuffer.Clear();
WBXmlStreamHelper.CharsBufferPool.Release(charArrayBuffer);
}
}
return(result);
}