GetChunkSize(IReadChunkBytes Source, out int chunkSize) {
int BytesRead;
int Size;
int Current;
GlobalLog.Enter("GetChunkSize");
Size = 0;
//
// Loop while we have data. If we run out of data and exit the loop
// at the bottom, then we've run out of data and haven't found the
// length.
Current = Source.NextByte;
BytesRead = 0;
if (Current == 10 || Current == 13) {
GlobalLog.Print(" Got Char: " + Current.ToString("X"));
BytesRead++;
Current = Source.NextByte;
}
while (Current != -1) {
// Get the next byte, and decode it.
if (Current >= '0' && Current <= '9') {
// Normalize it to 0 based.
Current -= '0';
}
else {
// If we're here, this might be a hex digit.
// If it is, normalize it to 10 based.
if (Current >= 'a' && Current <= 'f') {
Current -= 'a';
}
else {
if (Current >= 'A' && Current <= 'F') {
Current -= 'A';
}
else {
// Done with the decoding. If we haven't actually
// decoded a digit yet, we'll end up returning
// 0, which will signal the error.
// Push back the byte we read and didn't use.
Source.NextByte = Current;
chunkSize = Size;
// Return how many bytes we took.
GlobalLog.Print("Chunk Size = " + Size.ToString());
GlobalLog.Leave("GetChunkSize", BytesRead);
return BytesRead;
}
}
// If we get here we've had an A-F digit, add 10
// to it to normalize it.
Current += 10;
}
// Update the size and our state.
Size *= 16;
Size += Current;
BytesRead++;
Current = Source.NextByte;
}
chunkSize = Size;
GlobalLog.Print("*Chunk Size* = " + Size.ToString());
GlobalLog.Leave("GetChunkSize", -1);
return -1;
}
} // ChunkParse
