unsafe public virtual int GetBytes(byte[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex)
{
if (chars == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(nameof(chars)));
if (charIndex < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(charIndex), SR.Format(SR.ValueMustBeNonNegative)));
if (charIndex > chars.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(charIndex), SR.Format(SR.OffsetExceedsBufferSize, chars.Length)));
if (charCount < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(charCount), SR.Format(SR.ValueMustBeNonNegative)));
if (charCount > chars.Length - charIndex)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(charCount), SR.Format(SR.SizeExceedsRemainingBufferSpace, chars.Length - charIndex)));
if (bytes == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(nameof(bytes)));
if (byteIndex < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(byteIndex), SR.Format(SR.ValueMustBeNonNegative)));
if (byteIndex > bytes.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(nameof(byteIndex), SR.Format(SR.OffsetExceedsBufferSize, bytes.Length)));
if (charCount == 0)
return 0;
if ((charCount % 4) != 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.Format(SR.XmlInvalidBase64Length, charCount.ToString(NumberFormatInfo.CurrentInfo))));
fixed (byte* _char2val = s_char2val)
{
fixed (byte* _chars = &chars[charIndex])
{
fixed (byte* _bytes = &bytes[byteIndex])
{
byte* pch = _chars;
byte* pchMax = _chars + charCount;
byte* pb = _bytes;
byte* pbMax = _bytes + bytes.Length - byteIndex;
while (pch < pchMax)
{
DiagnosticUtility.DebugAssert(pch + 4 <= pchMax, "");
byte pch0 = pch[0];
byte pch1 = pch[1];
byte pch2 = pch[2];
byte pch3 = pch[3];
if ((pch0 | pch1 | pch2 | pch3) >= 128)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.Format(SR.XmlInvalidBase64Sequence, "?", charIndex + (int)(pch - _chars))));
// xx765432 xx107654 xx321076 xx543210
// 76543210 76543210 76543210
int v1 = _char2val[pch0];
int v2 = _char2val[pch1];
int v3 = _char2val[pch2];
int v4 = _char2val[pch3];
if (!IsValidLeadBytes(v1, v2, v3, v4) || !IsValidTailBytes(v3, v4))
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.Format(SR.XmlInvalidBase64Sequence, "?", charIndex + (int)(pch - _chars))));
int byteCount = (v4 != 64 ? 3 : (v3 != 64 ? 2 : 1));
if (pb + byteCount > pbMax)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.Format(SR.XmlArrayTooSmall), nameof(bytes)));
pb[0] = (byte)((v1 << 2) | ((v2 >> 4) & 0x03));
if (byteCount > 1)
{
pb[1] = (byte)((v2 << 4) | ((v3 >> 2) & 0x0F));
if (byteCount > 2)
{
pb[2] = (byte)((v3 << 6) | ((v4 >> 0) & 0x3F));
}
}
pb += byteCount;
pch += 4;
}
return (int)(pb - _bytes);
}
}
}
}
public override int GetMaxCharCount(int byteCount)
