static IEnumerable <int> ChangeBaseInternal(IEnumerable <char> src, ICharLookup inMap, ICharLookup outMap)
{
//the charOut/charsIn calculation is a bit magical
// i'm not exactly sure why this works out but it does
int charsOut = inMap.BytesIn * outMap.CharsOut;
int charsIn = inMap.CharsOut * outMap.BytesIn;
var unInMap = new GlifMap(inMap);
int[] inArr = new int[charsIn];
int[] outArr = new int[charsOut];
int inBase = inMap.Base();
int outBase = outMap.Base();
var iter = src.GetEnumerator();
bool done = false;
while (!done)
{
Array.Clear(inArr, 0, charsIn);
Array.Clear(outArr, 0, charsOut);
int inCount = 0;
while (inCount < charsIn)
{
if (iter.MoveNext())
{
int digit = unInMap.Map(iter.Current);
//reverse incoming bigendgian order
int iIndex = charsIn - inCount - 1;
inArr[iIndex] = digit;
}
else
{
done = true;
break;
}
inCount++;
}
//base calculation is done in little endian
ChangeBase(inBase, outBase, inArr, ref outArr);
//reverse again to restore big endianess
for (int o = charsOut - 1; o >= 0; o--)
{
yield return(outArr[o]);
}
}
}
void Init(ICharLookup map)
{
int @base = map.Base();
lookup = new Dictionary <char, int>(@base);
for (int b = 0; b < @base; b++)
{
lookup.Add(map.Map(b), b);
}
if (map.IncludePadding)
{
Padding = map.Padding;
}
}