private static Stream CreateDecoderStream(Stream[] packStreams, long[] packSizes, Stream[] outStreams, CFolder folderInfo, int coderIndex, IPasswordProvider pass)
{
int num2;
CCoderInfo info = folderInfo.Coders[coderIndex];
if (info.NumOutStreams != 1)
{
throw new NotSupportedException("Multiple output streams are not supported.");
}
int inStreamIndex = 0;
for (num2 = 0; num2 < coderIndex; num2++)
{
inStreamIndex += folderInfo.Coders[num2].NumInStreams;
}
int num3 = 0;
for (num2 = 0; num2 < coderIndex; num2++)
{
num3 += folderInfo.Coders[num2].NumOutStreams;
}
Stream[] inStreams = new Stream[info.NumInStreams];
num2 = 0;
while (num2 < inStreams.Length)
{
int num4 = folderInfo.FindBindPairForInStream(inStreamIndex);
if (num4 >= 0)
{
int outIndex = folderInfo.BindPairs[num4].OutIndex;
if (outStreams[outIndex] != null)
{
throw new NotSupportedException("Overlapping stream bindings are not supported.");
}
int num6 = FindCoderIndexForOutStreamIndex(folderInfo, outIndex);
inStreams[num2] = CreateDecoderStream(packStreams, packSizes, outStreams, folderInfo, num6, pass);
if (outStreams[outIndex] != null)
{
throw new NotSupportedException("Overlapping stream bindings are not supported.");
}
outStreams[outIndex] = inStreams[num2];
}
else
{
int index = folderInfo.FindPackStreamArrayIndex(inStreamIndex);
if (index < 0)
{
throw new NotSupportedException("Could not find input stream binding.");
}
inStreams[num2] = packStreams[index];
}
num2++;
inStreamIndex++;
}
long limit = folderInfo.UnpackSizes[num3];
return(DecoderRegistry.CreateDecoderStream(info.MethodId, inStreams, info.Props, pass, limit));
}
private static int FindCoderIndexForOutStreamIndex(CFolder folderInfo, int outStreamIndex)
{
for (int i = 0; i < folderInfo.Coders.Count; i++)
{
CCoderInfo info = folderInfo.Coders[i];
outStreamIndex -= info.NumOutStreams;
if (outStreamIndex < 0)
{
return(i);
}
}
throw new InvalidOperationException("Could not link output stream to coder.");
}